Merged master in yaw_acceptance_fix

344 files changed, 19723 insertions, 16185 deletions

diff --git a/src/drivers/airspeed/airspeed.cpp b/src/drivers/airspeed/airspeed.cpp
index 524151c90..41942aacd 100644
--- a/src/drivers/airspeed/airspeed.cpp
+++ b/src/drivers/airspeed/airspeed.cpp
@@ -82,10 +82,12 @@ Airspeed::Airspeed(int bus, int address, unsigned conversion_interval, const cha
 	_buffer_overflows(perf_alloc(PC_COUNT, "airspeed_buffer_overflows")),
 	_max_differential_pressure_pa(0),
 	_sensor_ok(false),
+	_last_published_sensor_ok(true), /* initialize differently to force publication */
 	_measure_ticks(0),
 	_collect_phase(false),
 	_diff_pres_offset(0.0f),
 	_airspeed_pub(-1),
+	_subsys_pub(-1),
 	_class_instance(-1),
 	_conversion_interval(conversion_interval),
 	_sample_perf(perf_alloc(PC_ELAPSED, "airspeed_read")),
@@ -149,8 +151,7 @@ Airspeed::init()
 	}
 
 	ret = OK;
-	/* sensor is ok, but we don't really know if it is within range */
-	_sensor_ok = true;
+
 out:
 	return ret;
 }
@@ -344,22 +345,6 @@ Airspeed::start()
 
 	/* schedule a cycle to start things */
 	work_queue(HPWORK, &_work, (worker_t)&Airspeed::cycle_trampoline, this, 1);
-
-	/* notify about state change */
-	struct subsystem_info_s info = {
-		true,
-		true,
-		true,
-		SUBSYSTEM_TYPE_DIFFPRESSURE
-	};
-	static orb_advert_t pub = -1;
-
-	if (pub > 0) {
-		orb_publish(ORB_ID(subsystem_info), pub, &info);
-
-	} else {
-		pub = orb_advertise(ORB_ID(subsystem_info), &info);
-	}
 }
 
 void
@@ -369,11 +354,34 @@ Airspeed::stop()
 }
 
 void
+Airspeed::update_status()
+{
+	if (_sensor_ok != _last_published_sensor_ok) {
+		/* notify about state change */
+		struct subsystem_info_s info = {
+			true,
+			true,
+			_sensor_ok,
+			SUBSYSTEM_TYPE_DIFFPRESSURE
+		};
+
+		if (_subsys_pub > 0) {
+			orb_publish(ORB_ID(subsystem_info), _subsys_pub, &info);
+		} else {
+			_subsys_pub = orb_advertise(ORB_ID(subsystem_info), &info);
+		}
+
+		_last_published_sensor_ok = _sensor_ok;
+	}
+}
+
+void
 Airspeed::cycle_trampoline(void *arg)
 {
 	Airspeed *dev = (Airspeed *)arg;
 
 	dev->cycle();
+	dev->update_status();
 }
 
 void
diff --git a/src/drivers/airspeed/airspeed.h b/src/drivers/airspeed/airspeed.h
index 186602eda..0b8e949c9 100644
--- a/src/drivers/airspeed/airspeed.h
+++ b/src/drivers/airspeed/airspeed.h
@@ -118,14 +118,21 @@ protected:
 	virtual int	measure() = 0;
 	virtual int	collect() = 0;
 
+	/**
+	 * Update the subsystem status
+	 */
+	void update_status();
+
 	work_s			_work;
 	float			_max_differential_pressure_pa;
 	bool			_sensor_ok;
+	bool			_last_published_sensor_ok;
 	int			_measure_ticks;
 	bool			_collect_phase;
 	float			_diff_pres_offset;
 
 	orb_advert_t		_airspeed_pub;
+	orb_advert_t		_subsys_pub;
 
 	int			_class_instance;
 
diff --git a/src/drivers/ardrone_interface/ardrone_interface.c b/src/drivers/ardrone_interface/ardrone_interface.c
index b88f61ce8..e5bb772b3 100644
--- a/src/drivers/ardrone_interface/ardrone_interface.c
+++ b/src/drivers/ardrone_interface/ardrone_interface.c
@@ -119,7 +119,7 @@ int ardrone_interface_main(int argc, char *argv[])
 		ardrone_interface_task = task_spawn_cmd("ardrone_interface",
 						    SCHED_DEFAULT,
 						    SCHED_PRIORITY_MAX - 15,
-						    2048,
+						    1100,
 						    ardrone_interface_thread_main,
 						    (argv) ? (const char **)&argv[2] : (const char **)NULL);
 		exit(0);
diff --git a/src/drivers/ardrone_interface/module.mk b/src/drivers/ardrone_interface/module.mk
index 058bd1397..d8e6c76c6 100644
--- a/src/drivers/ardrone_interface/module.mk
+++ b/src/drivers/ardrone_interface/module.mk
@@ -38,3 +38,4 @@
 MODULE_COMMAND	 = ardrone_interface
 SRCS		 = ardrone_interface.c \
 			   ardrone_motor_control.c
+MODULE_STACKSIZE = 1200
diff --git a/src/drivers/blinkm/blinkm.cpp b/src/drivers/blinkm/blinkm.cpp
index 2361f4dd1..98c491ce6 100644
--- a/src/drivers/blinkm/blinkm.cpp
+++ b/src/drivers/blinkm/blinkm.cpp
@@ -48,11 +48,14 @@
  * The recognized number off cells, will be blinked 5 times in purple color.
  * 2 Cells = 2 blinks
  * ...
- * 5 Cells = 5 blinks
+ * 6 Cells = 6 blinks
  * Now the Application will show the actual selected Flightmode, GPS-Fix and Battery Warnings and Alerts.
  *
- * System disarmed:
- * The BlinkM should lit solid red.
+ * System disarmed and safe:
+ * The BlinkM should light solid cyan.
+ *
+ * System safety off but not armed:
+ * The BlinkM should light flashing orange
  *
  * System armed:
  * One message is made of 4 Blinks and a pause in the same length as the 4 blinks.
@@ -67,10 +70,10 @@
  * (X = on, _=off)
  *
  * The first 3 blinks indicates the status of the GPS-Signal (red):
- * 0-4 satellites = X-X-X-X-_-_-_-_-_-_-
- *   5 satellites = X-X-_-X-_-_-_-_-_-_-
- *   6 satellites = X-_-_-X-_-_-_-_-_-_-
- * >=7 satellites = _-_-_-X-_-_-_-_-_-_-
+ * 0-4 satellites = X-X-X-X-X-_-_-_-_-_-
+ *   5 satellites = X-X-_-X-X-_-_-_-_-_-
+ *   6 satellites = X-_-_-X-X-_-_-_-_-_-
+ * >=7 satellites = _-_-_-X-X-_-_-_-_-_-
  * If no GPS is found the first 3 blinks are white
  *
  * The fourth Blink indicates the Flightmode:
@@ -119,6 +122,7 @@
 #include <uORB/topics/vehicle_control_mode.h>
 #include <uORB/topics/actuator_armed.h>
 #include <uORB/topics/vehicle_gps_position.h>
+#include <uORB/topics/safety.h>
 
 static const float MAX_CELL_VOLTAGE	= 4.3f;
 static const int LED_ONTIME = 120;
@@ -166,10 +170,12 @@ private:
 	enum ledColors {
 		LED_OFF,
 		LED_RED,
+		LED_ORANGE,
 		LED_YELLOW,
 		LED_PURPLE,
 		LED_GREEN,
 		LED_BLUE,
+		LED_CYAN,
 		LED_WHITE,
 		LED_AMBER
 	};
@@ -188,6 +194,26 @@ private:
 
 	bool systemstate_run;
 
+	int vehicle_status_sub_fd;
+	int vehicle_control_mode_sub_fd;
+	int vehicle_gps_position_sub_fd;
+	int actuator_armed_sub_fd;
+	int safety_sub_fd;
+
+	int num_of_cells;
+	int detected_cells_runcount;
+
+	int t_led_color[8];
+	int t_led_blink;
+	int led_thread_runcount;
+	int led_interval;
+
+	bool topic_initialized;
+	bool detected_cells_blinked;
+	bool led_thread_ready;
+
+	int num_of_used_sats;
+
 	void 			setLEDColor(int ledcolor);
 	static void		led_trampoline(void *arg);
 	void			led();
@@ -259,7 +285,22 @@ BlinkM::BlinkM(int bus, int blinkm) :
 	led_color_7(LED_OFF),
 	led_color_8(LED_OFF),
 	led_blink(LED_NOBLINK),
-	systemstate_run(false)
+	systemstate_run(false),
+	vehicle_status_sub_fd(-1),
+	vehicle_control_mode_sub_fd(-1),
+	vehicle_gps_position_sub_fd(-1),
+	actuator_armed_sub_fd(-1),
+	safety_sub_fd(-1),
+	num_of_cells(0),
+	detected_cells_runcount(0),
+	t_led_color({0}),
+	t_led_blink(0),
+	led_thread_runcount(0),
+	led_interval(1000),
+	topic_initialized(false),
+	detected_cells_blinked(false),
+	led_thread_ready(true),
+	num_of_used_sats(0)
 {
 	memset(&_work, 0, sizeof(_work));
 }
@@ -376,42 +417,22 @@ void
 BlinkM::led()
 {
 
-	static int vehicle_status_sub_fd;
-	static int vehicle_control_mode_sub_fd;
-	static int vehicle_gps_position_sub_fd;
-	static int actuator_armed_sub_fd;
-
-	static int num_of_cells = 0;
-	static int detected_cells_runcount = 0;
-
-	static int t_led_color[8] = { 0, 0, 0, 0, 0, 0, 0, 0};
-	static int t_led_blink = 0;
-	static int led_thread_runcount=0;
-	static int led_interval = 1000;
-
-	static int no_data_vehicle_status = 0;
-	static int no_data_vehicle_control_mode = 0;
-	static int no_data_actuator_armed = 0;
-	static int no_data_vehicle_gps_position = 0;
-
-	static bool topic_initialized = false;
-	static bool detected_cells_blinked = false;
-	static bool led_thread_ready = true;
-
-	int num_of_used_sats = 0;
-
 	if(!topic_initialized) {
 		vehicle_status_sub_fd = orb_subscribe(ORB_ID(vehicle_status));
-		orb_set_interval(vehicle_status_sub_fd, 1000);
+		orb_set_interval(vehicle_status_sub_fd, 250);
 
 		vehicle_control_mode_sub_fd = orb_subscribe(ORB_ID(vehicle_control_mode));
-		orb_set_interval(vehicle_control_mode_sub_fd, 1000);
+		orb_set_interval(vehicle_control_mode_sub_fd, 250);
 
 		actuator_armed_sub_fd = orb_subscribe(ORB_ID(actuator_armed));
-		orb_set_interval(actuator_armed_sub_fd, 1000);
+		orb_set_interval(actuator_armed_sub_fd, 250);
 
 		vehicle_gps_position_sub_fd = orb_subscribe(ORB_ID(vehicle_gps_position));
-		orb_set_interval(vehicle_gps_position_sub_fd, 1000);
+		orb_set_interval(vehicle_gps_position_sub_fd, 250);
+
+		/* Subscribe to safety topic */
+		safety_sub_fd = orb_subscribe(ORB_ID(safety));
+		orb_set_interval(safety_sub_fd, 250);
 
 		topic_initialized = true;
 	}
@@ -433,7 +454,9 @@ BlinkM::led()
 			if(num_of_cells > 4) {
 				t_led_color[4] = LED_PURPLE;
 			}
-			t_led_color[5] = LED_OFF;
+			if(num_of_cells > 5) {
+				t_led_color[5] = LED_PURPLE;
+			}
 			t_led_color[6] = LED_OFF;
 			t_led_color[7] = LED_OFF;
 			t_led_blink = LED_BLINK;
@@ -467,17 +490,25 @@ BlinkM::led()
 		struct vehicle_control_mode_s vehicle_control_mode;
 		struct actuator_armed_s actuator_armed;
 		struct vehicle_gps_position_s vehicle_gps_position_raw;
+		struct safety_s safety;
 
 		memset(&vehicle_status_raw, 0, sizeof(vehicle_status_raw));
 		memset(&vehicle_gps_position_raw, 0, sizeof(vehicle_gps_position_raw));
+		memset(&safety, 0, sizeof(safety));
 
 		bool new_data_vehicle_status;
 		bool new_data_vehicle_control_mode;
 		bool new_data_actuator_armed;
 		bool new_data_vehicle_gps_position;
+		bool new_data_safety;
 
 		orb_check(vehicle_status_sub_fd, &new_data_vehicle_status);
 
+		int no_data_vehicle_status = 0;
+		int no_data_vehicle_control_mode = 0;
+		int no_data_actuator_armed = 0;
+		int no_data_vehicle_gps_position = 0;
+
 		if (new_data_vehicle_status) {
 			orb_copy(ORB_ID(vehicle_status), vehicle_status_sub_fd, &vehicle_status_raw);
 			no_data_vehicle_status = 0;
@@ -520,7 +551,12 @@ BlinkM::led()
 				no_data_vehicle_gps_position = 3;
 		}
 
+		/* update safety topic */
+		orb_check(safety_sub_fd, &new_data_safety);
 
+		if (new_data_safety) {
+			orb_copy(ORB_ID(safety), safety_sub_fd, &safety);
+		}
 
 		/* get number of used satellites in navigation */
 		num_of_used_sats = 0;
@@ -541,19 +577,7 @@ BlinkM::led()
 				printf("<blinkm> cells found:%d\n", num_of_cells);
 
 			} else {
-				if(vehicle_status_raw.battery_warning == VEHICLE_BATTERY_WARNING_LOW) {
-					/* LED Pattern for battery low warning */
-					led_color_1 = LED_YELLOW;
-					led_color_2 = LED_YELLOW;
-					led_color_3 = LED_YELLOW;
-					led_color_4 = LED_YELLOW;
-					led_color_5 = LED_YELLOW;
-					led_color_6 = LED_YELLOW;
-					led_color_7 = LED_YELLOW;
-					led_color_8 = LED_YELLOW;
-					led_blink = LED_BLINK;
-
-				} else if(vehicle_status_raw.battery_warning == VEHICLE_BATTERY_WARNING_CRITICAL) {
+				if(vehicle_status_raw.battery_warning == VEHICLE_BATTERY_WARNING_CRITICAL) {
 					/* LED Pattern for battery critical alerting */
 					led_color_1 = LED_RED;
 					led_color_2 = LED_RED;
@@ -565,21 +589,56 @@ BlinkM::led()
 					led_color_8 = LED_RED;
 					led_blink = LED_BLINK;
 
+				} else if(vehicle_status_raw.rc_signal_lost) {
+					/* LED Pattern for FAILSAFE */
+					led_color_1 = LED_BLUE;
+					led_color_2 = LED_BLUE;
+					led_color_3 = LED_BLUE;
+					led_color_4 = LED_BLUE;
+					led_color_5 = LED_BLUE;
+					led_color_6 = LED_BLUE;
+					led_color_7 = LED_BLUE;
+					led_color_8 = LED_BLUE;
+					led_blink = LED_BLINK;
+
+				} else if(vehicle_status_raw.battery_warning == VEHICLE_BATTERY_WARNING_LOW) {
+					/* LED Pattern for battery low warning */
+					led_color_1 = LED_YELLOW;
+					led_color_2 = LED_YELLOW;
+					led_color_3 = LED_YELLOW;
+					led_color_4 = LED_YELLOW;
+					led_color_5 = LED_YELLOW;
+					led_color_6 = LED_YELLOW;
+					led_color_7 = LED_YELLOW;
+					led_color_8 = LED_YELLOW;
+					led_blink = LED_BLINK;
+
 				} else {
 					/* no battery warnings here */
 
 					if(actuator_armed.armed == false) {
 						/* system not armed */
-						led_color_1 = LED_RED;
-						led_color_2 = LED_RED;
-						led_color_3 = LED_RED;
-						led_color_4 = LED_RED;
-						led_color_5 = LED_RED;
-						led_color_6 = LED_RED;
-						led_color_7 = LED_RED;
-						led_color_8 = LED_RED;
-						led_blink = LED_NOBLINK;
-
+						if(safety.safety_off){
+							led_color_1 = LED_ORANGE;
+							led_color_2 = LED_ORANGE;
+							led_color_3 = LED_ORANGE;
+							led_color_4 = LED_ORANGE;
+							led_color_5 = LED_ORANGE;
+							led_color_6 = LED_ORANGE;
+							led_color_7 = LED_ORANGE;
+							led_color_8 = LED_ORANGE;
+							led_blink = LED_BLINK;
+						}else{
+							led_color_1 = LED_CYAN;
+							led_color_2 = LED_CYAN;
+							led_color_3 = LED_CYAN;
+							led_color_4 = LED_CYAN;
+							led_color_5 = LED_CYAN;
+							led_color_6 = LED_CYAN;
+							led_color_7 = LED_CYAN;
+							led_color_8 = LED_CYAN;
+							led_blink = LED_NOBLINK;
+						}
 					} else {
 						/* armed system - initial led pattern */
 						led_color_1 = LED_RED;
@@ -593,23 +652,23 @@ BlinkM::led()
 						led_blink = LED_BLINK;
 
 						if(new_data_vehicle_control_mode || no_data_vehicle_control_mode < 3) {
-
-							//XXX please check
-							if (vehicle_control_mode.flag_control_position_enabled)
+							/* indicate main control state */
+							if (vehicle_status_raw.main_state == MAIN_STATE_POSCTL)
 								led_color_4 = LED_GREEN;
-							else if (vehicle_control_mode.flag_control_velocity_enabled)
+							/* TODO: add other Auto modes */
+							else if (vehicle_status_raw.main_state == MAIN_STATE_AUTO_MISSION)
 								led_color_4 = LED_BLUE;
-							else if (vehicle_control_mode.flag_control_attitude_enabled)
+							else if (vehicle_status_raw.main_state == MAIN_STATE_ALTCTL)
 								led_color_4 = LED_YELLOW;
-							else if (vehicle_control_mode.flag_control_manual_enabled)
-								led_color_4 = LED_AMBER;
-							else 
+							else if (vehicle_status_raw.main_state == MAIN_STATE_MANUAL)
+								led_color_4 = LED_WHITE;
+							else
 								led_color_4 = LED_OFF;
-								
+							led_color_5 = led_color_4;
 						}
 
 						if(new_data_vehicle_gps_position || no_data_vehicle_gps_position < 3) {
-							/* handling used sat�s */
+							/* handling used satus */
 							if(num_of_used_sats >= 7) {
 								led_color_1 = LED_OFF;
 								led_color_2 = LED_OFF;
@@ -690,8 +749,11 @@ void BlinkM::setLEDColor(int ledcolor) {
 		case LED_RED:	// red
 			set_rgb(255,0,0);
 			break;
+		case LED_ORANGE:	// orange
+			set_rgb(255,150,0);
+			break;
 		case LED_YELLOW:	// yellow
-			set_rgb(255,70,0);
+			set_rgb(200,200,0);
 			break;
 		case LED_PURPLE:	// purple
 			set_rgb(255,0,255);
@@ -702,11 +764,14 @@ void BlinkM::setLEDColor(int ledcolor) {
 		case LED_BLUE:	// blue
 			set_rgb(0,0,255);
 			break;
+		case LED_CYAN:	// cyan
+			set_rgb(0,128,128);
+			break;
 		case LED_WHITE:	// white
 			set_rgb(255,255,255);
 			break;
 		case LED_AMBER:	// amber
-			set_rgb(255,20,0);
+			set_rgb(255,65,0);
 			break;
 	}
 }
diff --git a/src/drivers/boards/aerocore/aerocore_init.c b/src/drivers/boards/aerocore/aerocore_init.c
new file mode 100644
index 000000000..4e3ba2d7e
--- /dev/null
+++ b/src/drivers/boards/aerocore/aerocore_init.c
@@ -0,0 +1,282 @@
+/****************************************************************************
+ *
+ *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file aerocore_init.c
+ *
+ * AeroCore-specific early startup code.  This file implements the
+ * nsh_archinitialize() function that is called early by nsh during startup.
+ *
+ * Code here is run before the rcS script is invoked; it should start required
+ * subsystems and perform board-specific initialisation.
+ */
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/spi.h>
+#include <nuttx/i2c.h>
+#include <nuttx/mmcsd.h>
+#include <nuttx/analog/adc.h>
+#include <nuttx/gran.h>
+
+#include <stm32.h>
+#include "board_config.h"
+#include <stm32_uart.h>
+
+#include <arch/board/board.h>
+
+#include <drivers/drv_hrt.h>
+#include <drivers/drv_led.h>
+
+#include <systemlib/cpuload.h>
+#include <systemlib/perf_counter.h>
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/* Configuration ************************************************************/
+
+/* Debug ********************************************************************/
+
+#ifdef CONFIG_CPP_HAVE_VARARGS
+#  ifdef CONFIG_DEBUG
+#    define message(...) lowsyslog(__VA_ARGS__)
+#  else
+#    define message(...) printf(__VA_ARGS__)
+#  endif
+#else
+#  ifdef CONFIG_DEBUG
+#    define message lowsyslog
+#  else
+#    define message printf
+#  endif
+#endif
+
+/****************************************************************************
+ * Protected Functions
+ ****************************************************************************/
+
+#if defined(CONFIG_FAT_DMAMEMORY)
+# if !defined(CONFIG_GRAN) || !defined(CONFIG_FAT_DMAMEMORY)
+#  error microSD DMA support requires CONFIG_GRAN
+# endif
+
+static GRAN_HANDLE dma_allocator;
+
+/* 
+ * The DMA heap size constrains the total number of things that can be 
+ * ready to do DMA at a time.
+ *
+ * For example, FAT DMA depends on one sector-sized buffer per filesystem plus
+ * one sector-sized buffer per file. 
+ *
+ * We use a fundamental alignment / granule size of 64B; this is sufficient
+ * to guarantee alignment for the largest STM32 DMA burst (16 beats x 32bits).
+ */
+static uint8_t g_dma_heap[8192] __attribute__((aligned(64)));
+static perf_counter_t g_dma_perf;
+
+static void
+dma_alloc_init(void)
+{
+	dma_allocator = gran_initialize(g_dma_heap,
+					sizeof(g_dma_heap),
+					7,  /* 128B granule - must be > alignment (XXX bug?) */
+					6); /* 64B alignment */
+	if (dma_allocator == NULL) {
+		message("[boot] DMA allocator setup FAILED");
+	} else {
+		g_dma_perf = perf_alloc(PC_COUNT, "DMA allocations");
+	}
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/*
+ * DMA-aware allocator stubs for the FAT filesystem.
+ */
+
+__EXPORT void *fat_dma_alloc(size_t size);
+__EXPORT void fat_dma_free(FAR void *memory, size_t size);
+
+void *
+fat_dma_alloc(size_t size)
+{
+	perf_count(g_dma_perf);
+	return gran_alloc(dma_allocator, size);
+}
+
+void
+fat_dma_free(FAR void *memory, size_t size)
+{
+	gran_free(dma_allocator, memory, size);
+}
+
+#else
+
+# define dma_alloc_init()
+
+#endif
+
+/************************************************************************************
+ * Name: stm32_boardinitialize
+ *
+ * Description:
+ *   All STM32 architectures must provide the following entry point.  This entry point
+ *   is called early in the intitialization -- after all memory has been configured
+ *   and mapped but before any devices have been initialized.
+ *
+ ************************************************************************************/
+
+__EXPORT void
+stm32_boardinitialize(void)
+{
+	/* configure SPI interfaces */
+	stm32_spiinitialize();
+
+	/* configure LEDs */
+	up_ledinit();
+}
+
+/****************************************************************************
+ * Name: nsh_archinitialize
+ *
+ * Description:
+ *   Perform architecture specific initialization
+ *
+ ****************************************************************************/
+
+static struct spi_dev_s *spi3;
+static struct spi_dev_s *spi4;
+
+#include <math.h>
+
+#ifdef __cplusplus
+__EXPORT int matherr(struct __exception *e)
+{
+	return 1;
+}
+#else
+__EXPORT int matherr(struct exception *e)
+{
+	return 1;
+}
+#endif
+
+__EXPORT int nsh_archinitialize(void)
+{
+
+	/* configure ADC pins */
+	stm32_configgpio(GPIO_ADC1_IN10);	/* used by VBUS valid */
+	stm32_configgpio(GPIO_ADC1_IN11);	/* J1 breakout */
+	stm32_configgpio(GPIO_ADC1_IN12);	/* J1 breakout */
+	stm32_configgpio(GPIO_ADC1_IN13);	/* J1 breakout */
+
+	/* configure the high-resolution time/callout interface */
+	hrt_init();
+
+	/* configure the DMA allocator */
+	dma_alloc_init();
+
+	/* configure CPU load estimation */
+#ifdef CONFIG_SCHED_INSTRUMENTATION
+	cpuload_initialize_once();
+#endif
+
+	/* set up the serial DMA polling */
+	static struct hrt_call serial_dma_call;
+	struct timespec ts;
+
+	/*
+	 * Poll at 1ms intervals for received bytes that have not triggered
+	 * a DMA event.
+	 */
+	ts.tv_sec = 0;
+	ts.tv_nsec = 1000000;
+
+	hrt_call_every(&serial_dma_call,
+		       ts_to_abstime(&ts),
+		       ts_to_abstime(&ts),
+		       (hrt_callout)stm32_serial_dma_poll,
+		       NULL);
+
+	/* initial LED state */
+	drv_led_start();
+	led_off(LED_AMBER);
+
+	/* Configure Sensors on SPI bus #3 */
+	spi3 = up_spiinitialize(3);
+	if (!spi3) {
+		message("[boot] FAILED to initialize SPI port 3\n");
+		up_ledon(LED_AMBER);
+		return -ENODEV;
+	}
+	/* Default: 1MHz, 8 bits, Mode 3 */
+	SPI_SETFREQUENCY(spi3, 10000000);
+	SPI_SETBITS(spi3, 8);
+	SPI_SETMODE(spi3, SPIDEV_MODE3);
+	SPI_SELECT(spi3, PX4_SPIDEV_GYRO, false);
+	SPI_SELECT(spi3, PX4_SPIDEV_ACCEL_MAG, false);
+	SPI_SELECT(spi3, PX4_SPIDEV_BARO, false);
+	up_udelay(20);
+	message("[boot] Initialized SPI port 3 (SENSORS)\n");
+
+	/* Configure FRAM on SPI bus #4 */
+	spi4 = up_spiinitialize(4);
+	if (!spi4) {
+		message("[boot] FAILED to initialize SPI port 4\n");
+		up_ledon(LED_AMBER);
+		return -ENODEV;
+	}
+	/* Default: ~10MHz, 8 bits, Mode 3 */
+	SPI_SETFREQUENCY(spi4, 10 * 1000 * 1000);
+	SPI_SETBITS(spi4, 8);
+	SPI_SETMODE(spi4, SPIDEV_MODE0);
+	SPI_SELECT(spi4, SPIDEV_FLASH, false);
+	message("[boot] Initialized SPI port 4 (FRAM)\n");
+
+	return OK;
+}
diff --git a/src/modules/sdlog/sdlog_ringbuffer.c b/src/drivers/boards/aerocore/aerocore_led.c
index d7c8a4759..e40d1730c 100644
--- a/src/modules/sdlog/sdlog_ringbuffer.c
+++ b/src/drivers/boards/aerocore/aerocore_led.c
@@ -1,7 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2013 PX4 Development Team. All rights reserved.
- *   Author: Lorenz Meier <lm@inf.ethz.ch>
+ *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -33,59 +32,90 @@
  ****************************************************************************/
 
 /**
- * @file sdlog_log.c
- * MAVLink text logging.
+ * @file aerocore_led.c
  *
- * @author Lorenz Meier <lm@inf.ethz.ch>
+ * AeroCore LED backend.
  */
 
-#include <string.h>
-#include <stdlib.h>
+#include <nuttx/config.h>
 
-#include "sdlog_ringbuffer.h"
+#include <stdbool.h>
 
-void sdlog_logbuffer_init(struct sdlog_logbuffer *lb, int size)
-{
-	lb->size  = size;
-	lb->start = 0;
-	lb->count = 0;
-	lb->elems = (struct sdlog_sysvector *)calloc(lb->size, sizeof(struct sdlog_sysvector));
-}
+#include "stm32.h"
+#include "board_config.h"
+
+#include <arch/board/board.h>
 
-int sdlog_logbuffer_is_full(struct sdlog_logbuffer *lb)
+/*
+ * Ideally we'd be able to get these from up_internal.h,
+ * but since we want to be able to disable the NuttX use
+ * of leds for system indication at will and there is no
+ * separate switch, we need to build independent of the
+ * CONFIG_ARCH_LEDS configuration switch.
+ */
+__BEGIN_DECLS
+extern void led_init();
+extern void led_on(int led);
+extern void led_off(int led);
+extern void led_toggle(int led);
+__END_DECLS
+
+__EXPORT void led_init()
 {
-	return lb->count == (int)lb->size;
+	stm32_configgpio(GPIO_LED0);
+	stm32_configgpio(GPIO_LED1);
 }
 
-int sdlog_logbuffer_is_empty(struct sdlog_logbuffer *lb)
+__EXPORT void led_on(int led)
 {
-	return lb->count == 0;
-}
+	switch (led) {
+	case 0:
+		stm32_gpiowrite(GPIO_LED0, true);
+		break;
 
+	case 1:
+		stm32_gpiowrite(GPIO_LED1, true);
+		break;
 
-// XXX make these functions thread-safe
-void sdlog_logbuffer_write(struct sdlog_logbuffer *lb, const struct sdlog_sysvector *elem)
+	default:
+		warnx("LED ID not recognized\n");
+	}
+}
+
+__EXPORT void led_off(int led)
 {
-	int end = (lb->start + lb->count) % lb->size;
-	memcpy(&(lb->elems[end]), elem, sizeof(struct sdlog_sysvector));
+	switch (led) {
+	case 0:
+		stm32_gpiowrite(GPIO_LED0, false);
+		break;
 
-	if (sdlog_logbuffer_is_full(lb)) {
-		lb->start = (lb->start + 1) % lb->size; /* full, overwrite */
+	case 1:
+		stm32_gpiowrite(GPIO_LED1, false);
+		break;
 
-	} else {
-		++lb->count;
+	default:
+		warnx("LED ID not recognized\n");
 	}
 }
 
-int sdlog_logbuffer_read(struct sdlog_logbuffer *lb, struct sdlog_sysvector *elem)
+__EXPORT void led_toggle(int led)
 {
-	if (!sdlog_logbuffer_is_empty(lb)) {
-		memcpy(elem, &(lb->elems[lb->start]), sizeof(struct sdlog_sysvector));
-		lb->start = (lb->start + 1) % lb->size;
-		--lb->count;
-		return 0;
-
-	} else {
-		return 1;
+	switch (led) {
+	case 0:
+		if (stm32_gpioread(GPIO_LED0))
+			stm32_gpiowrite(GPIO_LED0, false);
+		else
+			stm32_gpiowrite(GPIO_LED0, true);
+		break;
+
+	case 1:
+		if (stm32_gpioread(GPIO_LED1))
+			stm32_gpiowrite(GPIO_LED1, false);
+		else
+			stm32_gpiowrite(GPIO_LED1, true);
+		break;
+
+	default:
+		warnx("LED ID not recognized\n");
 	}
 }
diff --git a/src/drivers/boards/aerocore/aerocore_pwm_servo.c b/src/drivers/boards/aerocore/aerocore_pwm_servo.c
new file mode 100644
index 000000000..251eaff7b
--- /dev/null
+++ b/src/drivers/boards/aerocore/aerocore_pwm_servo.c
@@ -0,0 +1,117 @@
+/****************************************************************************
+ *
+ *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/*
+ * @file aerocore_pwm_servo.c
+ *
+ * Configuration data for the stm32 pwm_servo driver.
+ *
+ * Note that these arrays must always be fully-sized.
+ */
+
+#include <stdint.h>
+
+#include <stm32.h>
+#include <stm32_gpio.h>
+#include <stm32_tim.h>
+
+#include <drivers/stm32/drv_pwm_servo.h>
+#include <drivers/drv_pwm_output.h>
+
+#include "board_config.h"
+
+__EXPORT const struct pwm_servo_timer pwm_timers[PWM_SERVO_MAX_TIMERS] = {
+	{
+		.base = STM32_TIM1_BASE,
+		.clock_register = STM32_RCC_APB2ENR,
+		.clock_bit = RCC_APB2ENR_TIM1EN,
+		.clock_freq = STM32_APB2_TIM1_CLKIN
+	},
+	{
+		.base = STM32_TIM3_BASE,
+		.clock_register = STM32_RCC_APB1ENR,
+		.clock_bit = RCC_APB1ENR_TIM3EN,
+		.clock_freq = STM32_APB1_TIM3_CLKIN
+	}
+};
+
+__EXPORT const struct pwm_servo_channel pwm_channels[PWM_SERVO_MAX_CHANNELS] = {
+	{
+		.gpio = GPIO_TIM1_CH1OUT,
+		.timer_index = 0,
+		.timer_channel = 1,
+		.default_value = 1500,
+	},
+	{
+		.gpio = GPIO_TIM1_CH2OUT,
+		.timer_index = 0,
+		.timer_channel = 2,
+		.default_value = 1500,
+	},
+	{
+		.gpio = GPIO_TIM1_CH3OUT,
+		.timer_index = 0,
+		.timer_channel = 3,
+		.default_value = 1500,
+	},
+	{
+		.gpio = GPIO_TIM1_CH4OUT,
+		.timer_index = 0,
+		.timer_channel = 4,
+		.default_value = 1500,
+	},
+	{
+		.gpio = GPIO_TIM3_CH1OUT,
+		.timer_index = 1,
+		.timer_channel = 1,
+		.default_value = 1500,
+	},
+	{
+		.gpio = GPIO_TIM3_CH2OUT,
+		.timer_index = 1,
+		.timer_channel = 2,
+		.default_value = 1500,
+	},
+	{
+		.gpio = GPIO_TIM3_CH3OUT,
+		.timer_index = 1,
+		.timer_channel = 3,
+		.default_value = 1500,
+	},
+	{
+		.gpio = GPIO_TIM3_CH4OUT,
+		.timer_index = 1,
+		.timer_channel = 4,
+		.default_value = 1500,
+	}
+};
diff --git a/src/drivers/boards/aerocore/aerocore_spi.c b/src/drivers/boards/aerocore/aerocore_spi.c
new file mode 100644
index 000000000..e329bd9d1
--- /dev/null
+++ b/src/drivers/boards/aerocore/aerocore_spi.c
@@ -0,0 +1,183 @@
+/****************************************************************************
+ *
+ *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file aerocore_spi.c
+ *
+ * Board-specific SPI functions.
+ */
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <debug.h>
+
+#include <nuttx/spi.h>
+#include <arch/board/board.h>
+
+#include <up_arch.h>
+#include <chip.h>
+#include <stm32.h>
+#include "board_config.h"
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: stm32_spiinitialize
+ *
+ * Description:
+ *   Called to configure SPI chip select GPIO pins for the PX4FMU board.
+ *
+ ************************************************************************************/
+
+__EXPORT void weak_function stm32_spiinitialize(void)
+{
+#ifdef CONFIG_STM32_SPI1
+	stm32_configgpio(GPIO_SPI1_NSS);
+	stm32_gpiowrite(GPIO_SPI1_NSS, 1);
+#endif
+
+#ifdef CONFIG_STM32_SPI2
+	stm32_configgpio(GPIO_SPI2_NSS);
+	stm32_gpiowrite(GPIO_SPI2_NSS, 1);
+#endif
+
+#ifdef CONFIG_STM32_SPI3
+	stm32_configgpio(GPIO_SPI_CS_GYRO);
+	stm32_configgpio(GPIO_SPI_CS_ACCEL_MAG);
+	stm32_configgpio(GPIO_SPI_CS_BARO);
+
+	/* De-activate all peripherals,
+	 * required for some peripheral
+	 * state machines
+	 */
+	stm32_gpiowrite(GPIO_SPI_CS_GYRO, 1);
+	stm32_gpiowrite(GPIO_SPI_CS_ACCEL_MAG, 1);
+	stm32_gpiowrite(GPIO_SPI_CS_BARO, 1);
+
+	stm32_configgpio(GPIO_EXTI_GYRO_DRDY);
+	stm32_configgpio(GPIO_EXTI_MAG_DRDY);
+	stm32_configgpio(GPIO_EXTI_ACCEL_DRDY);
+#endif
+
+#ifdef CONFIG_STM32_SPI4
+	stm32_configgpio(GPIO_SPI4_NSS);
+	stm32_gpiowrite(GPIO_SPI4_NSS, 1);
+#endif
+}
+
+#ifdef CONFIG_STM32_SPI1
+__EXPORT void stm32_spi1select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
+{
+	/* there is only one device broken-out so select it */
+	stm32_gpiowrite(GPIO_SPI1_NSS, !selected);
+}
+
+__EXPORT uint8_t stm32_spi1status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
+{
+	return SPI_STATUS_PRESENT;
+}
+#endif
+
+#ifdef CONFIG_STM32_SPI2
+__EXPORT void stm32_spi2select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
+{
+	/* there is only one device broken-out so select it */
+	stm32_gpiowrite(GPIO_SPI2_NSS, !selected);
+}
+
+__EXPORT uint8_t stm32_spi2status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
+{
+	return SPI_STATUS_PRESENT;
+}
+#endif
+
+#ifdef CONFIG_STM32_SPI3
+__EXPORT void stm32_spi3select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
+{
+	/* SPI select is active low, so write !selected to select the device */
+
+	switch (devid) {
+	case PX4_SPIDEV_GYRO:
+		/* Making sure the other peripherals are not selected */
+		stm32_gpiowrite(GPIO_SPI_CS_GYRO, !selected);
+		stm32_gpiowrite(GPIO_SPI_CS_ACCEL_MAG, 1);
+		stm32_gpiowrite(GPIO_SPI_CS_BARO, 1);
+		break;
+
+	case PX4_SPIDEV_ACCEL_MAG:
+		/* Making sure the other peripherals are not selected */
+		stm32_gpiowrite(GPIO_SPI_CS_GYRO, 1);
+		stm32_gpiowrite(GPIO_SPI_CS_ACCEL_MAG, !selected);
+		stm32_gpiowrite(GPIO_SPI_CS_BARO, 1);
+		break;
+
+	case PX4_SPIDEV_BARO:
+		/* Making sure the other peripherals are not selected */
+		stm32_gpiowrite(GPIO_SPI_CS_GYRO, 1);
+		stm32_gpiowrite(GPIO_SPI_CS_ACCEL_MAG, 1);
+		stm32_gpiowrite(GPIO_SPI_CS_BARO, !selected);
+		break;
+
+	default:
+		break;
+	}
+}
+
+__EXPORT uint8_t stm32_spi3status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
+{
+	return SPI_STATUS_PRESENT;
+}
+#endif
+
+
+#ifdef CONFIG_STM32_SPI4
+__EXPORT void stm32_spi4select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
+{
+	/* there can only be one device on this bus, so always select it */
+	stm32_gpiowrite(GPIO_SPI4_NSS, !selected);
+}
+
+__EXPORT uint8_t stm32_spi4status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
+{
+	/* FRAM is always present */
+	return SPI_STATUS_PRESENT;
+}
+#endif
diff --git a/src/drivers/boards/aerocore/board_config.h b/src/drivers/boards/aerocore/board_config.h
new file mode 100644
index 000000000..70142a314
--- /dev/null
+++ b/src/drivers/boards/aerocore/board_config.h
@@ -0,0 +1,176 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file board_config.h
+ *
+ * AeroCore internal definitions
+ */
+
+#pragma once
+
+/****************************************************************************************************
+ * Included Files
+ ****************************************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+#include <stdint.h>
+
+__BEGIN_DECLS
+
+/* these headers are not C++ safe */
+#include <stm32.h>
+#include <arch/board/board.h>
+
+#define UDID_START		0x1FFF7A10
+ 
+/****************************************************************************************************
+ * Definitions
+ ****************************************************************************************************/
+
+/* LEDs */
+#define GPIO_LED0	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_SET|GPIO_PORTE|GPIO_PIN9)
+#define GPIO_LED1	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_SET|GPIO_PORTE|GPIO_PIN10)
+
+/* Gyro */
+#define GPIO_EXTI_GYRO_DRDY	(GPIO_INPUT|GPIO_FLOAT|GPIO_EXTI|GPIO_PORTD|GPIO_PIN0)
+#define SENSOR_BOARD_ROTATION_DEFAULT	3 /* SENSOR_BOARD_ROTATION_270_DEG */
+
+/* Accel & Mag */
+#define GPIO_EXTI_MAG_DRDY	(GPIO_INPUT|GPIO_FLOAT|GPIO_EXTI|GPIO_PORTD|GPIO_PIN1)
+#define GPIO_EXTI_ACCEL_DRDY	(GPIO_INPUT|GPIO_FLOAT|GPIO_EXTI|GPIO_PORTD|GPIO_PIN2)
+
+/* GPS */
+#define GPIO_GPS_NRESET		(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_OUTPUT_SET|GPIO_PORTC|GPIO_PIN5)
+#define GPIO_GPS_TIMEPULSE	(GPIO_INPUT|GPIO_FLOAT|GPIO_PORTC|GPIO_PIN4)
+#define GPS_DEFAULT_UART_PORT	"/dev/ttyS0"
+
+/* SPI3--Sensors */
+#define PX4_SPI_BUS_SENSORS	3
+#define GPIO_SPI_CS_ACCEL_MAG	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_SET|GPIO_PORTE|GPIO_PIN2)
+#define GPIO_SPI_CS_GYRO	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_SET|GPIO_PORTE|GPIO_PIN3)
+#define GPIO_SPI_CS_BARO	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_SET|GPIO_PORTE|GPIO_PIN4)
+
+/* Nominal chip selects for devices on SPI bus #3 */
+#define PX4_SPIDEV_ACCEL_MAG	0
+#define PX4_SPIDEV_GYRO		1
+#define PX4_SPIDEV_BARO		2
+
+/* User GPIOs broken out on J11 */
+#define GPIO_GPIO0_INPUT	(GPIO_INPUT|GPIO_PULLUP|GPIO_PORTB|GPIO_PIN0)
+#define GPIO_GPIO1_INPUT	(GPIO_INPUT|GPIO_PULLUP|GPIO_PORTB|GPIO_PIN1)
+#define GPIO_GPIO3_INPUT	(GPIO_INPUT|GPIO_PULLUP|GPIO_PORTA|GPIO_PIN1)
+#define GPIO_GPIO4_INPUT	(GPIO_INPUT|GPIO_PULLUP|GPIO_PORTA|GPIO_PIN2)
+#define GPIO_GPIO5_INPUT	(GPIO_INPUT|GPIO_PULLUP|GPIO_PORTA|GPIO_PIN3)
+#define GPIO_GPIO6_INPUT	(GPIO_INPUT|GPIO_PULLUP|GPIO_PORTD|GPIO_PIN12)
+#define GPIO_GPIO7_INPUT	(GPIO_INPUT|GPIO_PULLUP|GPIO_PORTD|GPIO_PIN13)
+#define GPIO_GPIO8_INPUT	(GPIO_INPUT|GPIO_PULLUP|GPIO_PORTD|GPIO_PIN14)
+#define GPIO_GPIO9_INPUT	(GPIO_INPUT|GPIO_PULLUP|GPIO_PORTD|GPIO_PIN15)
+#define GPIO_GPIO10_INPUT	(GPIO_INPUT|GPIO_PULLUP|GPIO_PORTB|GPIO_PIN5)
+#define GPIO_GPIO11_INPUT	(GPIO_INPUT|GPIO_PULLUP|GPIO_PORTB|GPIO_PIN8)
+
+#define GPIO_GPIO0_OUTPUT	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTB|GPIO_PIN0)
+#define GPIO_GPIO1_OUTPUT	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTB|GPIO_PIN1)
+#define GPIO_GPIO3_OUTPUT	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTA|GPIO_PIN1)
+#define GPIO_GPIO4_OUTPUT	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTA|GPIO_PIN2)
+#define GPIO_GPIO5_OUTPUT	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTA|GPIO_PIN3)
+#define GPIO_GPIO6_OUTPUT	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTD|GPIO_PIN12)
+#define GPIO_GPIO7_OUTPUT	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTD|GPIO_PIN13)
+#define GPIO_GPIO8_OUTPUT	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTD|GPIO_PIN14)
+#define GPIO_GPIO9_OUTPUT	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTD|GPIO_PIN15)
+#define GPIO_GPIO10_OUTPUT	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTB|GPIO_PIN5)
+#define GPIO_GPIO11_OUTPUT	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTB|GPIO_PIN8)
+
+/* PWM
+ *
+ * Eight PWM outputs are configured.
+ *
+ * Pins:
+ *
+ * CH1 : PA8  : TIM1_CH1
+ * CH2 : PA9  : TIM1_CH2
+ * CH3 : PA10 : TIM1_CH3
+ * CH4 : PA11 : TIM1_CH4
+ * CH5 : PC6  : TIM3_CH1
+ * CH6 : PC7  : TIM3_CH2
+ * CH7 : PC8  : TIM3_CH3
+ * CH8 : PC9  : TIM3_CH4
+ */
+#define GPIO_TIM1_CH1OUT	GPIO_TIM1_CH1OUT_1
+#define GPIO_TIM1_CH2OUT	GPIO_TIM1_CH2OUT_1
+#define GPIO_TIM1_CH3OUT	GPIO_TIM1_CH3OUT_1
+#define GPIO_TIM1_CH4OUT	GPIO_TIM1_CH4OUT_1
+#define GPIO_TIM3_CH1OUT	GPIO_TIM3_CH1OUT_3
+#define GPIO_TIM3_CH2OUT	GPIO_TIM3_CH2OUT_3
+#define GPIO_TIM3_CH3OUT	GPIO_TIM3_CH3OUT_2
+#define GPIO_TIM3_CH4OUT	GPIO_TIM3_CH4OUT_2
+
+/* High-resolution timer */
+#define HRT_TIMER		8	/* use timer 8 for the HRT */
+#define HRT_TIMER_CHANNEL	1	/* use capture/compare channel */
+
+/* Tone Alarm (no onboard speaker )*/
+#define TONE_ALARM_TIMER	2	/* timer 2 */
+#define TONE_ALARM_CHANNEL	1	/* channel 1 */
+#define GPIO_TONE_ALARM_IDLE	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTA|GPIO_PIN0)
+#define GPIO_TONE_ALARM		(GPIO_ALT|GPIO_AF1|GPIO_SPEED_2MHz|GPIO_PUSHPULL|GPIO_PORTA|GPIO_PIN0)
+
+
+/****************************************************************************************************
+ * Public Types
+ ****************************************************************************************************/
+
+/****************************************************************************************************
+ * Public data
+ ****************************************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/****************************************************************************************************
+ * Public Functions
+ ****************************************************************************************************/
+
+/****************************************************************************************************
+ * Name: stm32_spiinitialize
+ *
+ * Description:
+ *   Called to configure SPI chip select GPIO pins for the PX4FMU board.
+ *
+ ****************************************************************************************************/
+
+extern void stm32_spiinitialize(void);
+
+#endif /* __ASSEMBLY__ */
+
+__END_DECLS
diff --git a/src/drivers/boards/aerocore/module.mk b/src/drivers/boards/aerocore/module.mk
new file mode 100644
index 000000000..b53fe0a29
--- /dev/null
+++ b/src/drivers/boards/aerocore/module.mk
@@ -0,0 +1,8 @@
+#
+# Board-specific startup code for the AeroCore
+#
+
+SRCS		 = aerocore_init.c \
+		   aerocore_pwm_servo.c \
+		   aerocore_spi.c \
+		   aerocore_led.c
diff --git a/src/drivers/boards/px4fmu-v1/board_config.h b/src/drivers/boards/px4fmu-v1/board_config.h
index 02c26b5c0..c944007a5 100644
--- a/src/drivers/boards/px4fmu-v1/board_config.h
+++ b/src/drivers/boards/px4fmu-v1/board_config.h
@@ -85,6 +85,9 @@ __BEGIN_DECLS
 #define GPIO_SPI_CS_MPU		(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET|GPIO_PORTB|GPIO_PIN0)
 #define GPIO_SPI_CS_SDCARD	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET|GPIO_PORTA|GPIO_PIN4)
 
+#define PX4_SPI_BUS_SENSORS	1
+#define PX4_SPI_BUS_EXT		2
+
 /*
  * Use these in place of the spi_dev_e enumeration to
  * select a specific SPI device on SPI1
@@ -96,7 +99,7 @@ __BEGIN_DECLS
 /*
  * Optional devices on IO's external port
  */
-#define PX4_SPIDEV_ACCEL_MAG 2
+#define PX4_SPIDEV_ACCEL_MAG	2
 
 /*
  * I2C busses
diff --git a/src/drivers/boards/px4fmu-v1/px4fmu_init.c b/src/drivers/boards/px4fmu-v1/px4fmu_init.c
index 4b12b75f9..293021f8b 100644
--- a/src/drivers/boards/px4fmu-v1/px4fmu_init.c
+++ b/src/drivers/boards/px4fmu-v1/px4fmu_init.c
@@ -99,7 +99,7 @@
  * CONFIG_ARCH_LEDS configuration switch.
  */
 __BEGIN_DECLS
-extern void led_init();
+extern void led_init(void);
 extern void led_on(int led);
 extern void led_off(int led);
 __END_DECLS
diff --git a/src/drivers/boards/px4fmu-v1/px4fmu_led.c b/src/drivers/boards/px4fmu-v1/px4fmu_led.c
index ea91f34ad..ee53fc43d 100644
--- a/src/drivers/boards/px4fmu-v1/px4fmu_led.c
+++ b/src/drivers/boards/px4fmu-v1/px4fmu_led.c
@@ -54,13 +54,13 @@
  * CONFIG_ARCH_LEDS configuration switch.
  */
 __BEGIN_DECLS
-extern void led_init();
+extern void led_init(void);
 extern void led_on(int led);
 extern void led_off(int led);
 extern void led_toggle(int led);
 __END_DECLS
 
-__EXPORT void led_init()
+__EXPORT void led_init(void)
 {
 	/* Configure LED1-2 GPIOs for output */
 
diff --git a/src/drivers/boards/px4fmu-v2/board_config.h b/src/drivers/boards/px4fmu-v2/board_config.h
index 7cfca7656..36eb7bec4 100644
--- a/src/drivers/boards/px4fmu-v2/board_config.h
+++ b/src/drivers/boards/px4fmu-v2/board_config.h
@@ -106,6 +106,11 @@ __BEGIN_DECLS
 #define GPIO_SPI_CS_BARO	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_SET|GPIO_PORTD|GPIO_PIN7)
 #define GPIO_SPI_CS_FRAM	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_SET|GPIO_PORTD|GPIO_PIN10)
 #define GPIO_SPI_CS_MPU		(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_SET|GPIO_PORTC|GPIO_PIN2)
+#define GPIO_SPI_CS_EXT0	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET|GPIO_PORTE|GPIO_PIN4)
+#define GPIO_SPI_CS_EXT1	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET|GPIO_PORTC|GPIO_PIN14)
+
+#define PX4_SPI_BUS_SENSORS	1
+#define PX4_SPI_BUS_EXT		4
 
 /* Use these in place of the spi_dev_e enumeration to select a specific SPI device on SPI1 */
 #define PX4_SPIDEV_GYRO		1
@@ -113,6 +118,10 @@ __BEGIN_DECLS
 #define PX4_SPIDEV_BARO		3
 #define PX4_SPIDEV_MPU		4
 
+/* External bus */
+#define PX4_SPIDEV_EXT0		1
+#define PX4_SPIDEV_EXT1		2
+
 /* I2C busses */
 #define PX4_I2C_BUS_EXPANSION	1
 #define PX4_I2C_BUS_LED		2
diff --git a/src/drivers/boards/px4fmu-v2/px4fmu2_init.c b/src/drivers/boards/px4fmu-v2/px4fmu2_init.c
index 71414d62c..bf41bb1fe 100644
--- a/src/drivers/boards/px4fmu-v2/px4fmu2_init.c
+++ b/src/drivers/boards/px4fmu-v2/px4fmu2_init.c
@@ -192,6 +192,7 @@ stm32_boardinitialize(void)
 
 static struct spi_dev_s *spi1;
 static struct spi_dev_s *spi2;
+static struct spi_dev_s *spi4;
 static struct sdio_dev_s *sdio;
 
 #include <math.h>
@@ -305,6 +306,17 @@ __EXPORT int nsh_archinitialize(void)
 
 	message("[boot] Initialized SPI port 2 (RAMTRON FRAM)\n");
 
+	spi4 = up_spiinitialize(4);
+
+	/* Default SPI4 to 1MHz and de-assert the known chip selects. */
+	SPI_SETFREQUENCY(spi4, 10000000);
+	SPI_SETBITS(spi4, 8);
+	SPI_SETMODE(spi4, SPIDEV_MODE3);
+	SPI_SELECT(spi4, PX4_SPIDEV_EXT0, false);
+	SPI_SELECT(spi4, PX4_SPIDEV_EXT1, false);
+
+	message("[boot] Initialized SPI port 4\n");
+
 	#ifdef CONFIG_MMCSD
 	/* First, get an instance of the SDIO interface */
 
diff --git a/src/drivers/boards/px4fmu-v2/px4fmu2_led.c b/src/drivers/boards/px4fmu-v2/px4fmu2_led.c
index a856ccb02..3c05bfa46 100644
--- a/src/drivers/boards/px4fmu-v2/px4fmu2_led.c
+++ b/src/drivers/boards/px4fmu-v2/px4fmu2_led.c
@@ -54,7 +54,7 @@
  * CONFIG_ARCH_LEDS configuration switch.
  */
 __BEGIN_DECLS
-extern void led_init();
+extern void led_init(void);
 extern void led_on(int led);
 extern void led_off(int led);
 extern void led_toggle(int led);
diff --git a/src/drivers/boards/px4fmu-v2/px4fmu_spi.c b/src/drivers/boards/px4fmu-v2/px4fmu_spi.c
index c66c490a7..01dbd6e77 100644
--- a/src/drivers/boards/px4fmu-v2/px4fmu_spi.c
+++ b/src/drivers/boards/px4fmu-v2/px4fmu_spi.c
@@ -94,6 +94,13 @@ __EXPORT void weak_function stm32_spiinitialize(void)
 	stm32_configgpio(GPIO_SPI_CS_FRAM);
 	stm32_gpiowrite(GPIO_SPI_CS_FRAM, 1);
 #endif
+
+#ifdef CONFIG_STM32_SPI4
+	stm32_configgpio(GPIO_SPI_CS_EXT0);
+	stm32_configgpio(GPIO_SPI_CS_EXT1);
+	stm32_gpiowrite(GPIO_SPI_CS_EXT0, 1);
+	stm32_gpiowrite(GPIO_SPI_CS_EXT1, 1);
+#endif
 }
 
 __EXPORT void stm32_spi1select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
@@ -157,3 +164,31 @@ __EXPORT uint8_t stm32_spi2status(FAR struct spi_dev_s *dev, enum spi_dev_e devi
 	return SPI_STATUS_PRESENT;
 }
 #endif
+
+__EXPORT void stm32_spi4select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
+{
+	/* SPI select is active low, so write !selected to select the device */
+
+	switch (devid) {
+	case PX4_SPIDEV_EXT0:
+		/* Making sure the other peripherals are not selected */
+		stm32_gpiowrite(GPIO_SPI_CS_EXT0, !selected);
+		stm32_gpiowrite(GPIO_SPI_CS_EXT1, 1);
+		break;
+
+	case PX4_SPIDEV_EXT1:
+		/* Making sure the other peripherals are not selected */
+		stm32_gpiowrite(GPIO_SPI_CS_EXT1, !selected);
+		stm32_gpiowrite(GPIO_SPI_CS_EXT0, 1);
+		break;
+
+	default:
+		break;
+
+	}
+}
+
+__EXPORT uint8_t stm32_spi4status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
+{
+	return SPI_STATUS_PRESENT;
+}
diff --git a/src/drivers/drv_gpio.h b/src/drivers/drv_gpio.h
index f60964c2b..5acd0d343 100644
--- a/src/drivers/drv_gpio.h
+++ b/src/drivers/drv_gpio.h
@@ -94,6 +94,14 @@
 
 #endif
 
+#ifdef CONFIG_ARCH_BOARD_AEROCORE
+/*
+ * AeroCore GPIO numbers and configuration.
+ *
+ */
+# define PX4FMU_DEVICE_PATH	"/dev/px4fmu"
+#endif
+
 #ifdef CONFIG_ARCH_BOARD_PX4IO_V1
 /* no GPIO driver on the PX4IOv1 board */
 #endif
@@ -146,4 +154,4 @@
 
 #define GPIO_SENSOR_RAIL_RESET	GPIOC(13)
 
-#endif /* _DRV_GPIO_H */
\ No newline at end of file
+#endif /* _DRV_GPIO_H */
diff --git a/src/drivers/drv_gps.h b/src/drivers/drv_gps.h
index 06e3535b3..e14f4e00d 100644
--- a/src/drivers/drv_gps.h
+++ b/src/drivers/drv_gps.h
@@ -43,10 +43,14 @@
 #include <stdint.h>
 #include <sys/ioctl.h>
 
+#include "board_config.h"
+
 #include "drv_sensor.h"
 #include "drv_orb_dev.h"
 
+#ifndef GPS_DEFAULT_UART_PORT
 #define GPS_DEFAULT_UART_PORT "/dev/ttyS3"
+#endif
 
 #define GPS_DEVICE_PATH	"/dev/gps"
 
diff --git a/src/drivers/drv_hrt.h b/src/drivers/drv_hrt.h
index d130d68b3..8bfc90c64 100644
--- a/src/drivers/drv_hrt.h
+++ b/src/drivers/drv_hrt.h
@@ -41,6 +41,7 @@
 
 #include <sys/types.h>
 #include <stdbool.h>
+#include <inttypes.h>
 
 #include <time.h>
 #include <queue.h>
diff --git a/src/drivers/drv_io_expander.h b/src/drivers/drv_io_expander.h
new file mode 100644
index 000000000..106354377
--- /dev/null
+++ b/src/drivers/drv_io_expander.h
@@ -0,0 +1,71 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file drv_io_expander.h
+ *
+ * IO expander device API
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <sys/ioctl.h>
+
+/*
+ * ioctl() definitions
+ */
+
+#define _IOXIOCBASE		(0x2800)
+#define _IOXIOC(_n)		(_IOC(_IOXIOCBASE, _n))
+
+/** set a bitmask (non-blocking) */
+#define IOX_SET_MASK		_IOXIOC(1)
+
+/** get a bitmask (blocking) */
+#define IOX_GET_MASK		_IOXIOC(2)
+
+/** set device mode (non-blocking) */
+#define IOX_SET_MODE		_IOXIOC(3)
+
+/** set constant values (non-blocking) */
+#define IOX_SET_VALUE		_IOXIOC(4)
+
+/* ... to IOX_SET_VALUE + 8 */
+
+/* enum passed to RGBLED_SET_MODE ioctl()*/
+enum IOX_MODE {
+	IOX_MODE_OFF,
+	IOX_MODE_ON,
+	IOX_MODE_TEST_OUT
+};
diff --git a/src/drivers/drv_pwm_output.h b/src/drivers/drv_pwm_output.h
index 7a93e513e..972573f9f 100644
--- a/src/drivers/drv_pwm_output.h
+++ b/src/drivers/drv_pwm_output.h
@@ -199,6 +199,9 @@ ORB_DECLARE(output_pwm);
 /** get the lockdown override flag to enable outputs in HIL */
 #define PWM_SERVO_GET_DISABLE_LOCKDOWN		_IOC(_PWM_SERVO_BASE, 22)
 
+/** force safety switch off (to disable use of safety switch) */
+#define PWM_SERVO_SET_FORCE_SAFETY_OFF _IOC(_PWM_SERVO_BASE, 23)
+
 /*
  *
  *
diff --git a/src/drivers/drv_range_finder.h b/src/drivers/drv_range_finder.h
index cf91f7030..e45939b37 100644
--- a/src/drivers/drv_range_finder.h
+++ b/src/drivers/drv_range_finder.h
@@ -46,6 +46,10 @@
 
 #define RANGE_FINDER_DEVICE_PATH	"/dev/range_finder"
 
+enum RANGE_FINDER_TYPE {
+	RANGE_FINDER_TYPE_LASER = 0,
+};
+
 /**
  * range finder report structure.  Reads from the device must be in multiples of this
  * structure.
@@ -53,8 +57,11 @@
 struct range_finder_report {
 	uint64_t timestamp;
 	uint64_t error_count;
-	float distance; 			/** in meters */
-	uint8_t valid;				/** 1 == within sensor range, 0 = outside sensor range */
+	unsigned type;				/**< type, following RANGE_FINDER_TYPE enum */
+	float distance; 			/**< in meters */
+	float minimum_distance;			/**< minimum distance the sensor can measure */
+	float maximum_distance;			/**< maximum distance the sensor can measure */
+	uint8_t valid;				/**< 1 == within sensor range, 0 = outside sensor range */
 };
 
 /*
diff --git a/src/drivers/drv_tone_alarm.h b/src/drivers/drv_tone_alarm.h
index cb5fd53a5..b7981e9c4 100644
--- a/src/drivers/drv_tone_alarm.h
+++ b/src/drivers/drv_tone_alarm.h
@@ -147,6 +147,8 @@ enum {
 	TONE_BATTERY_WARNING_SLOW_TUNE,
 	TONE_BATTERY_WARNING_FAST_TUNE,
 	TONE_GPS_WARNING_TUNE,
+	TONE_ARMING_FAILURE_TUNE,
+	TONE_PARACHUTE_RELEASE_TUNE,
 	TONE_NUMBER_OF_TUNES
 };
 
diff --git a/src/drivers/ets_airspeed/ets_airspeed.cpp b/src/drivers/ets_airspeed/ets_airspeed.cpp
index d873a1132..1a7e068fe 100644
--- a/src/drivers/ets_airspeed/ets_airspeed.cpp
+++ b/src/drivers/ets_airspeed/ets_airspeed.cpp
@@ -154,8 +154,9 @@ ETSAirspeed::collect()
 		return ret;
 	}
 
-	uint16_t diff_pres_pa = val[1] << 8 | val[0];
-        if (diff_pres_pa == 0) {
+	uint16_t diff_pres_pa_raw = val[1] << 8 | val[0];
+	uint16_t diff_pres_pa;
+        if (diff_pres_pa_raw == 0) {
 		// a zero value means the pressure sensor cannot give us a
 		// value. We need to return, and not report a value or the
 		// caller could end up using this value as part of an
@@ -165,10 +166,10 @@ ETSAirspeed::collect()
 		return -1;
         }
 
-	if (diff_pres_pa < _diff_pres_offset + MIN_ACCURATE_DIFF_PRES_PA) {
+	if (diff_pres_pa_raw < _diff_pres_offset + MIN_ACCURATE_DIFF_PRES_PA) {
 		diff_pres_pa = 0;
 	} else {
-		diff_pres_pa -= _diff_pres_offset;
+		diff_pres_pa = diff_pres_pa_raw - _diff_pres_offset;
 	}
 
 	// Track maximum differential pressure measured (so we can work out top speed).
@@ -183,6 +184,7 @@ ETSAirspeed::collect()
 
 	// XXX we may want to smooth out the readings to remove noise.
 	report.differential_pressure_filtered_pa = (float)diff_pres_pa;
+	report.differential_pressure_raw_pa = (float)diff_pres_pa_raw;
 	report.temperature = -1000.0f;
 	report.voltage = 0;
 	report.max_differential_pressure_pa = _max_differential_pressure_pa;
@@ -207,14 +209,18 @@ ETSAirspeed::collect()
 void
 ETSAirspeed::cycle()
 {
+	int ret;
+
 	/* collection phase? */
 	if (_collect_phase) {
 
 		/* perform collection */
-		if (OK != collect()) {
+		ret = collect();
+		if (OK != ret) {
 			perf_count(_comms_errors);
 			/* restart the measurement state machine */
 			start();
+			_sensor_ok = false;
 			return;
 		}
 
@@ -238,8 +244,12 @@ ETSAirspeed::cycle()
 	}
 
 	/* measurement phase */
-	if (OK != measure())
-		log("measure error");
+	ret = measure();
+	if (OK != ret) {
+		debug("measure error");
+	}
+
+	_sensor_ok = (ret == OK);
 
 	/* next phase is collection */
 	_collect_phase = true;
@@ -354,7 +364,7 @@ test()
 		err(1, "immediate read failed");
 
 	warnx("single read");
-	warnx("diff pressure: %d pa", report.differential_pressure_pa);
+	warnx("diff pressure: %f pa", (double)report.differential_pressure_pa);
 
 	/* start the sensor polling at 2Hz */
 	if (OK != ioctl(fd, SENSORIOCSPOLLRATE, 2))
@@ -379,7 +389,7 @@ test()
 			err(1, "periodic read failed");
 
 		warnx("periodic read %u", i);
-		warnx("diff pressure: %d pa", report.differential_pressure_pa);
+		warnx("diff pressure: %f pa", (double)report.differential_pressure_pa);
 	}
 
 	/* reset the sensor polling to its default rate */
diff --git a/src/drivers/frsky_telemetry/frsky_data.c b/src/drivers/frsky_telemetry/frsky_data.c
index cfcf91e3f..dd9b90fb3 100644
--- a/src/drivers/frsky_telemetry/frsky_data.c
+++ b/src/drivers/frsky_telemetry/frsky_data.c
@@ -53,6 +53,8 @@
 #include <uORB/topics/vehicle_global_position.h>
 #include <uORB/topics/vehicle_status.h>
 
+#include <drivers/drv_hrt.h>
+
 /* FrSky sensor hub data IDs */
 #define FRSKY_ID_GPS_ALT_BP     0x01
 #define FRSKY_ID_TEMP1          0x02
@@ -192,17 +194,12 @@ void frsky_send_frame1(int uart)
 }
 
 /**
- * Formats the decimal latitude/longitude to the required degrees/minutes/seconds.
+ * Formats the decimal latitude/longitude to the required degrees/minutes.
  */
 static float frsky_format_gps(float dec)
 {
-	float dms_deg = (int) dec;
-	float dec_deg = dec - dms_deg;
-	float dms_min = (int) (dec_deg * 60);
-	float dec_min = (dec_deg * 60) - dms_min;
-	float dms_sec = dec_min * 60;
-
-	return (dms_deg * 100.0f) + dms_min + (dms_sec / 100.0f);
+	float dm_deg = (int) dec;
+	return (dm_deg * 100.0f) + (dec - dm_deg) * 60;
 }
 
 /**
@@ -225,14 +222,14 @@ void frsky_send_frame2(int uart)
 	float course = 0, lat = 0, lon = 0, speed = 0, alt = 0;
 	char lat_ns = 0, lon_ew = 0;
 	int sec = 0;
-	if (global_pos.global_valid) {
+	if (global_pos.timestamp != 0 && hrt_absolute_time() < global_pos.timestamp + 20000) {
 		time_t time_gps = global_pos.time_gps_usec / 1000000;
 		struct tm *tm_gps = gmtime(&time_gps);
 
 		course = (global_pos.yaw + M_PI_F) / M_PI_F * 180.0f;
-		lat    = frsky_format_gps(abs(global_pos.lat));
+		lat    = frsky_format_gps(fabsf(global_pos.lat));
 		lat_ns = (global_pos.lat < 0) ? 'S' : 'N';
-		lon    = frsky_format_gps(abs(global_pos.lon));
+		lon    = frsky_format_gps(fabsf(global_pos.lon));
 		lon_ew = (global_pos.lon < 0) ? 'W' : 'E';
 		speed  = sqrtf(global_pos.vel_n * global_pos.vel_n + global_pos.vel_e * global_pos.vel_e)
 				* 25.0f / 46.0f;
diff --git a/src/drivers/frsky_telemetry/frsky_telemetry.c b/src/drivers/frsky_telemetry/frsky_telemetry.c
index 7b08ca69e..6e0839043 100644
--- a/src/drivers/frsky_telemetry/frsky_telemetry.c
+++ b/src/drivers/frsky_telemetry/frsky_telemetry.c
@@ -222,7 +222,7 @@ int frsky_telemetry_main(int argc, char *argv[])
 		frsky_task = task_spawn_cmd("frsky_telemetry",
 					  SCHED_DEFAULT,
 					  SCHED_PRIORITY_DEFAULT,
-					  2048,
+					  2000,
 					  frsky_telemetry_thread_main,
 					  (const char **)argv);
 
diff --git a/src/drivers/frsky_telemetry/module.mk b/src/drivers/frsky_telemetry/module.mk
index 1632c74f7..9a49589ee 100644
--- a/src/drivers/frsky_telemetry/module.mk
+++ b/src/drivers/frsky_telemetry/module.mk
@@ -39,3 +39,5 @@ MODULE_COMMAND	= frsky_telemetry
 
 SRCS		= frsky_data.c \
               frsky_telemetry.c
+
+MODULE_STACKSIZE = 1200
diff --git a/src/drivers/gps/gps.cpp b/src/drivers/gps/gps.cpp
index c72f692d7..dd505abdb 100644
--- a/src/drivers/gps/gps.cpp
+++ b/src/drivers/gps/gps.cpp
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2013 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -56,6 +56,7 @@
 #include <arch/board/board.h>
 #include <drivers/drv_hrt.h>
 #include <drivers/device/i2c.h>
+#include <systemlib/systemlib.h>
 #include <systemlib/perf_counter.h>
 #include <systemlib/scheduling_priorities.h>
 #include <systemlib/err.h>
@@ -63,6 +64,8 @@
 #include <uORB/uORB.h>
 #include <uORB/topics/vehicle_gps_position.h>
 
+#include <board_config.h>
+
 #include "ubx.h"
 #include "mtk.h"
 
@@ -76,12 +79,6 @@
 #endif
 static const int ERROR = -1;
 
-#ifndef CONFIG_SCHED_WORKQUEUE
-# error This requires CONFIG_SCHED_WORKQUEUE.
-#endif
-
-
-
 class GPS : public device::CDev
 {
 public:
@@ -209,7 +206,8 @@ GPS::init()
 		goto out;
 
 	/* start the GPS driver worker task */
-	_task = task_create("gps", SCHED_PRIORITY_SLOW_DRIVER, 2048, (main_t)&GPS::task_main_trampoline, nullptr);
+	_task = task_spawn_cmd("gps", SCHED_DEFAULT,
+				SCHED_PRIORITY_SLOW_DRIVER, 2000, (main_t)&GPS::task_main_trampoline, nullptr);
 
 	if (_task < 0) {
 		warnx("task start failed: %d", errno);
@@ -276,14 +274,14 @@ GPS::task_main()
 			_report.timestamp_position = hrt_absolute_time();
 			_report.lat = (int32_t)47.378301e7f;
 			_report.lon = (int32_t)8.538777e7f;
-			_report.alt = (int32_t)400e3f;
+			_report.alt = (int32_t)1200e3f;
 			_report.timestamp_variance = hrt_absolute_time();
 			_report.s_variance_m_s = 10.0f;
 			_report.p_variance_m = 10.0f;
 			_report.c_variance_rad = 0.1f;
 			_report.fix_type = 3;
-			_report.eph_m = 10.0f;
-			_report.epv_m = 10.0f;
+			_report.eph = 0.9f;
+			_report.epv = 1.8f;
 			_report.timestamp_velocity = hrt_absolute_time();
 			_report.vel_n_m_s = 0.0f;
 			_report.vel_e_m_s = 0.0f;
@@ -359,7 +357,7 @@ GPS::task_main()
 					}
 
 					if (!_healthy) {
-						char *mode_str = "unknown";
+						const char *mode_str = "unknown";
 
 						switch (_mode) {
 						case GPS_DRIVER_MODE_UBX:
@@ -421,7 +419,14 @@ GPS::task_main()
 void
 GPS::cmd_reset()
 {
-	//XXX add reset?
+#ifdef GPIO_GPS_NRESET
+	warnx("Toggling GPS reset pin");
+	stm32_configgpio(GPIO_GPS_NRESET);
+	stm32_gpiowrite(GPIO_GPS_NRESET, 0);
+	usleep(100);
+	stm32_gpiowrite(GPIO_GPS_NRESET, 1);
+	warnx("Toggled GPS reset pin");
+#endif
 }
 
 void
@@ -443,10 +448,10 @@ GPS::print_info()
 	warnx("port: %s, baudrate: %d, status: %s", _port, _baudrate, (_healthy) ? "OK" : "NOT OK");
 
 	if (_report.timestamp_position != 0) {
-		warnx("position lock: %dD, satellites: %d, last update: %fms ago", (int)_report.fix_type,
-				_report.satellites_visible, (hrt_absolute_time() - _report.timestamp_position) / 1000.0f);
+		warnx("position lock: %dD, satellites: %d, last update: %8.4fms ago", (int)_report.fix_type,
+				_report.satellites_visible, (double)(hrt_absolute_time() - _report.timestamp_position) / 1000.0d);
 		warnx("lat: %d, lon: %d, alt: %d", _report.lat, _report.lon, _report.alt);
-		warnx("eph: %.2fm, epv: %.2fm", _report.eph_m, _report.epv_m);
+		warnx("eph: %.2fm, epv: %.2fm", (double)_report.eph, (double)_report.epv);
 		warnx("rate position: \t%6.2f Hz", (double)_Helper->get_position_update_rate());
 		warnx("rate velocity: \t%6.2f Hz", (double)_Helper->get_velocity_update_rate());
 		warnx("rate publication:\t%6.2f Hz", (double)_rate);
@@ -573,7 +578,7 @@ gps_main(int argc, char *argv[])
 {
 
 	/* set to default */
-	char *device_name = GPS_DEFAULT_UART_PORT;
+	const char *device_name = GPS_DEFAULT_UART_PORT;
 	bool fake_gps = false;
 
 	/*
diff --git a/src/drivers/gps/gps_helper.cpp b/src/drivers/gps/gps_helper.cpp
index 2360ff39b..3b92f1bf4 100644
--- a/src/drivers/gps/gps_helper.cpp
+++ b/src/drivers/gps/gps_helper.cpp
@@ -56,7 +56,7 @@ GPS_Helper::get_velocity_update_rate()
 	return _rate_vel;
 }
 
-float
+void
 GPS_Helper::reset_update_rates()
 {
 	_rate_count_vel = 0;
@@ -64,7 +64,7 @@ GPS_Helper::reset_update_rates()
 	_interval_rate_start = hrt_absolute_time();
 }
 
-float
+void
 GPS_Helper::store_update_rates()
 {
 	_rate_vel = _rate_count_vel / (((float)(hrt_absolute_time() - _interval_rate_start)) / 1000000.0f);
diff --git a/src/drivers/gps/gps_helper.h b/src/drivers/gps/gps_helper.h
index cfb9e0d43..d14a95afe 100644
--- a/src/drivers/gps/gps_helper.h
+++ b/src/drivers/gps/gps_helper.h
@@ -46,13 +46,17 @@
 class GPS_Helper
 {
 public:
+
+	GPS_Helper() {};
+	virtual ~GPS_Helper() {};
+
 	virtual int			configure(unsigned &baud) = 0;
 	virtual int 			receive(unsigned timeout) = 0;
 	int 				set_baudrate(const int &fd, unsigned baud);
 	float				get_position_update_rate();
 	float				get_velocity_update_rate();
-	float				reset_update_rates();
-	float				store_update_rates();
+	void				reset_update_rates();
+	void				store_update_rates();
 
 protected:
 	uint8_t _rate_count_lat_lon;
diff --git a/src/drivers/gps/module.mk b/src/drivers/gps/module.mk
index 82c67d40a..eb382c4b2 100644
--- a/src/drivers/gps/module.mk
+++ b/src/drivers/gps/module.mk
@@ -41,3 +41,5 @@ SRCS		= gps.cpp \
 		  gps_helper.cpp \
 		  mtk.cpp \
 		  ubx.cpp
+
+MODULE_STACKSIZE = 1200
diff --git a/src/drivers/gps/mtk.cpp b/src/drivers/gps/mtk.cpp
index c90ecbe28..41716cd97 100644
--- a/src/drivers/gps/mtk.cpp
+++ b/src/drivers/gps/mtk.cpp
@@ -249,12 +249,18 @@ MTK::handle_message(gps_mtk_packet_t &packet)
 		warnx("mtk: unknown revision");
 		_gps_position->lat = 0;
 		_gps_position->lon = 0;
+
+		// Indicate this data is not usable and bail out
+		_gps_position->eph = 1000.0f;
+		_gps_position->epv = 1000.0f;
+		_gps_position->fix_type = 0;
+		return;
 	}
 
 	_gps_position->alt = (int32_t)(packet.msl_altitude * 10); // from cm to mm
 	_gps_position->fix_type = packet.fix_type;
-	_gps_position->eph_m = packet.hdop; // XXX: Check this because eph_m is in m and hdop is without unit
-	_gps_position->epv_m = 0.0; //unknown in mtk custom mode
+	_gps_position->eph = packet.hdop / 100.0f; // from cm to m
+	_gps_position->epv = _gps_position->eph; // unknown in mtk custom mode, so we cheat with eph
 	_gps_position->vel_m_s = ((float)packet.ground_speed) * 1e-2f; // from cm/s to m/s
 	_gps_position->cog_rad = ((float)packet.heading) * M_DEG_TO_RAD_F * 1e-2f; //from deg *100 to rad
 	_gps_position->satellites_visible = packet.satellites;
diff --git a/src/drivers/gps/ubx.cpp b/src/drivers/gps/ubx.cpp
index 8a2afecb7..404607571 100644
--- a/src/drivers/gps/ubx.cpp
+++ b/src/drivers/gps/ubx.cpp
@@ -69,6 +69,9 @@ UBX::UBX(const int &fd, struct vehicle_gps_position_s *gps_position) :
 	_gps_position(gps_position),
 	_configured(false),
 	_waiting_for_ack(false),
+	_got_posllh(false),
+	_got_velned(false),
+	_got_timeutc(false),
 	_disable_cmd_last(0)
 {
 	decode_init();
@@ -164,7 +167,7 @@ UBX::configure(unsigned &baudrate)
 	send_config_packet(_fd, (uint8_t *)&cfg_rate_packet, sizeof(cfg_rate_packet));
 
 	if (wait_for_ack(UBX_CONFIG_TIMEOUT) < 0) {
-		warnx("ubx: configuration failed: RATE");
+		warnx("CFG FAIL: RATE");
 		return 1;
 	}
 
@@ -185,7 +188,7 @@ UBX::configure(unsigned &baudrate)
 	send_config_packet(_fd, (uint8_t *)&cfg_nav5_packet, sizeof(cfg_nav5_packet));
 
 	if (wait_for_ack(UBX_CONFIG_TIMEOUT) < 0) {
-		warnx("ubx: configuration failed: NAV5");
+		warnx("CFG FAIL: NAV5");
 		return 1;
 	}
 
@@ -194,35 +197,42 @@ UBX::configure(unsigned &baudrate)
 	configure_message_rate(UBX_CLASS_NAV, UBX_MESSAGE_NAV_POSLLH, 1);
 
 	if (wait_for_ack(UBX_CONFIG_TIMEOUT) < 0) {
-		warnx("ubx: msg rate configuration failed: NAV POSLLH");
+		warnx("MSG CFG FAIL: NAV POSLLH");
 		return 1;
 	}
 
 	configure_message_rate(UBX_CLASS_NAV, UBX_MESSAGE_NAV_TIMEUTC, 1);
 
 	if (wait_for_ack(UBX_CONFIG_TIMEOUT) < 0) {
-		warnx("ubx: msg rate configuration failed: NAV TIMEUTC");
+		warnx("MSG CFG FAIL: NAV TIMEUTC");
 		return 1;
 	}
 
 	configure_message_rate(UBX_CLASS_NAV, UBX_MESSAGE_NAV_SOL, 1);
 
 	if (wait_for_ack(UBX_CONFIG_TIMEOUT) < 0) {
-		warnx("ubx: msg rate configuration failed: NAV SOL");
+		warnx("MSG CFG FAIL: NAV SOL");
 		return 1;
 	}
 
 	configure_message_rate(UBX_CLASS_NAV, UBX_MESSAGE_NAV_VELNED, 1);
 
 	if (wait_for_ack(UBX_CONFIG_TIMEOUT) < 0) {
-		warnx("ubx: msg rate configuration failed: NAV VELNED");
+		warnx("MSG CFG FAIL: NAV VELNED");
 		return 1;
 	}
 
 	configure_message_rate(UBX_CLASS_NAV, UBX_MESSAGE_NAV_SVINFO, 5);
 
 	if (wait_for_ack(UBX_CONFIG_TIMEOUT) < 0) {
-		warnx("ubx: msg rate configuration failed: NAV SVINFO");
+		warnx("MSG CFG FAIL: NAV SVINFO");
+		return 1;
+	}
+
+	configure_message_rate(UBX_CLASS_MON, UBX_MESSAGE_MON_HW, 1);
+
+	if (wait_for_ack(UBX_CONFIG_TIMEOUT) < 0) {
+		warnx("MSG CFG FAIL: MON HW");
 		return 1;
 	}
 
@@ -268,18 +278,22 @@ UBX::receive(unsigned timeout)
 	bool handled = false;
 
 	while (true) {
+		bool ready_to_return = _configured ? (_got_posllh && _got_velned && _got_timeutc) : handled;
 
 		/* poll for new data, wait for only UBX_PACKET_TIMEOUT (2ms) if something already received */
-		int ret = poll(fds, sizeof(fds) / sizeof(fds[0]), handled ? UBX_PACKET_TIMEOUT : timeout);
+		int ret = poll(fds, sizeof(fds) / sizeof(fds[0]), ready_to_return ? UBX_PACKET_TIMEOUT : timeout);
 
 		if (ret < 0) {
 			/* something went wrong when polling */
-			warnx("ubx: poll error");
+			warnx("poll error");
 			return -1;
 
 		} else if (ret == 0) {
 			/* return success after short delay after receiving a packet or timeout after long delay */
-			if (handled) {
+			if (ready_to_return) {
+				_got_posllh = false;
+				_got_velned = false;
+				_got_timeutc = false;
 				return 1;
 
 			} else {
@@ -310,7 +324,7 @@ UBX::receive(unsigned timeout)
 
 		/* abort after timeout if no useful packets received */
 		if (time_started + timeout * 1000 < hrt_absolute_time()) {
-			warnx("ubx: timeout - no useful messages");
+			warnx("timeout - no useful messages");
 			return -1;
 		}
 	}
@@ -383,7 +397,7 @@ UBX::parse_char(uint8_t b)
 				return 1;	// message received successfully
 
 			} else {
-				warnx("ubx: checksum wrong");
+				warnx("checksum wrong");
 				decode_init();
 				return -1;
 			}
@@ -392,7 +406,7 @@ UBX::parse_char(uint8_t b)
 			_rx_count++;
 
 		} else {
-			warnx("ubx: buffer full");
+			warnx("buffer full");
 			decode_init();
 			return -1;
 		}
@@ -425,12 +439,13 @@ UBX::handle_message()
 					_gps_position->lat = packet->lat;
 					_gps_position->lon = packet->lon;
 					_gps_position->alt = packet->height_msl;
-					_gps_position->eph_m = (float)packet->hAcc * 1e-3f; // from mm to m
-					_gps_position->epv_m = (float)packet->vAcc * 1e-3f; // from mm to m
+					_gps_position->eph = (float)packet->hAcc * 1e-3f; // from mm to m
+					_gps_position->epv = (float)packet->vAcc * 1e-3f; // from mm to m
 					_gps_position->timestamp_position = hrt_absolute_time();
 
 					_rate_count_lat_lon++;
 
+					_got_posllh = true;
 					ret = 1;
 					break;
 				}
@@ -440,8 +455,8 @@ UBX::handle_message()
 					gps_bin_nav_sol_packet_t *packet = (gps_bin_nav_sol_packet_t *) _rx_buffer;
 
 					_gps_position->fix_type = packet->gpsFix;
-					_gps_position->s_variance_m_s = packet->sAcc;
-					_gps_position->p_variance_m = packet->pAcc;
+					_gps_position->s_variance_m_s = (float)packet->sAcc * 1e-2f; // from cm/s to m/s
+					_gps_position->p_variance_m = (float)packet->pAcc * 1e-2f; // from cm to m
 					_gps_position->timestamp_variance = hrt_absolute_time();
 
 					ret = 1;
@@ -475,6 +490,7 @@ UBX::handle_message()
 					_gps_position->time_gps_usec += (uint64_t)(packet->time_nanoseconds * 1e-3f);
 					_gps_position->timestamp_time = hrt_absolute_time();
 
+					_got_timeutc = true;
 					ret = 1;
 					break;
 				}
@@ -550,6 +566,7 @@ UBX::handle_message()
 
 					_rate_count_vel++;
 
+					_got_velned = true;
 					ret = 1;
 					break;
 				}
@@ -566,6 +583,24 @@ UBX::handle_message()
 				break;
 			}
 
+		case UBX_CLASS_MON: {
+			switch (_message_id) {
+			case UBX_MESSAGE_MON_HW: {
+
+					struct gps_bin_mon_hw_packet *p = (struct gps_bin_mon_hw_packet*) _rx_buffer;
+
+					_gps_position->noise_per_ms = p->noisePerMS;
+					_gps_position->jamming_indicator = p->jamInd;
+
+					ret = 1;
+					break;
+				}
+
+			default:
+				break;
+			}
+		}
+
 		default:
 			break;
 		}
diff --git a/src/drivers/gps/ubx.h b/src/drivers/gps/ubx.h
index 79a904f4a..43d688893 100644
--- a/src/drivers/gps/ubx.h
+++ b/src/drivers/gps/ubx.h
@@ -56,6 +56,7 @@
 //#define UBX_CLASS_RXM 0x02
 #define UBX_CLASS_ACK 0x05
 #define UBX_CLASS_CFG 0x06
+#define UBX_CLASS_MON 0x0A
 
 /* MessageIDs (the ones that are used) */
 #define UBX_MESSAGE_NAV_POSLLH 0x02
@@ -72,6 +73,8 @@
 #define UBX_MESSAGE_CFG_RATE 0x08
 #define UBX_MESSAGE_CFG_NAV5 0x24
 
+#define UBX_MESSAGE_MON_HW	0x09
+
 #define UBX_CFG_PRT_LENGTH 20
 #define UBX_CFG_PRT_PAYLOAD_PORTID 0x01			/**< UART1 */
 #define UBX_CFG_PRT_PAYLOAD_MODE 0x000008D0		/**< 0b0000100011010000: 8N1 */
@@ -210,6 +213,27 @@ typedef struct {
 	uint8_t ck_b;
 } gps_bin_nav_velned_packet_t;
 
+struct gps_bin_mon_hw_packet {
+	uint32_t pinSel;
+	uint32_t pinBank;
+	uint32_t pinDir;
+	uint32_t pinVal;
+	uint16_t noisePerMS;
+	uint16_t agcCnt;
+	uint8_t aStatus;
+	uint8_t aPower;
+	uint8_t flags;
+	uint8_t __reserved1;
+	uint32_t usedMask;
+	uint8_t VP[25];
+	uint8_t jamInd;
+	uint16_t __reserved3;
+	uint32_t pinIrq;
+	uint32_t pulLH;
+	uint32_t pullL;
+};
+
+
 //typedef struct {
 //	int32_t time_milliseconds; 		/**< Measurement integer millisecond GPS time of week */
 //	int16_t week; 					/**< Measurement GPS week number */
@@ -319,7 +343,7 @@ typedef enum {
 //typedef type_gps_bin_ubx_state gps_bin_ubx_state_t;
 #pragma pack(pop)
 
-#define RECV_BUFFER_SIZE 500 //The NAV-SOL messages really need such a big buffer
+#define RECV_BUFFER_SIZE 300 //The NAV-SOL messages really need such a big buffer
 
 class UBX : public GPS_Helper
 {
@@ -373,6 +397,9 @@ private:
 	struct vehicle_gps_position_s *_gps_position;
 	bool			_configured;
 	bool			_waiting_for_ack;
+	bool			_got_posllh;
+	bool			_got_velned;
+	bool			_got_timeutc;
 	uint8_t			_message_class_needed;
 	uint8_t			_message_id_needed;
 	ubx_decode_state_t	_decode_state;
@@ -383,7 +410,7 @@ private:
 	uint8_t			_message_class;
 	uint8_t			_message_id;
 	unsigned		_payload_size;
-	uint8_t			_disable_cmd_last;
+	hrt_abstime		_disable_cmd_last;
 };
 
 #endif /* UBX_H_ */
diff --git a/src/drivers/hil/hil.cpp b/src/drivers/hil/hil.cpp
index 0a047f38f..55cc077fb 100644
--- a/src/drivers/hil/hil.cpp
+++ b/src/drivers/hil/hil.cpp
@@ -122,7 +122,7 @@ private:
 	actuator_controls_s _controls;
 
 	static void	task_main_trampoline(int argc, char *argv[]);
-	void		task_main() __attribute__((noreturn));
+	void		task_main();
 
 	static int	control_callback(uintptr_t handle,
 			uint8_t control_group,
diff --git a/src/drivers/hmc5883/hmc5883.cpp b/src/drivers/hmc5883/hmc5883.cpp
index 4c85c0cda..b7b368a5e 100644
--- a/src/drivers/hmc5883/hmc5883.cpp
+++ b/src/drivers/hmc5883/hmc5883.cpp
@@ -158,6 +158,7 @@ private:
 	int			_class_instance;
 
 	orb_advert_t		_mag_topic;
+	orb_advert_t		_subsystem_pub;
 
 	perf_counter_t		_sample_perf;
 	perf_counter_t		_comms_errors;
@@ -169,6 +170,8 @@ private:
 
 	int			_bus;			/**< the bus the device is connected to */
 
+	struct mag_report	_last_report;           /**< used for info() */
+
 	/**
 	 * Test whether the device supported by the driver is present at a
 	 * specific address.
@@ -322,8 +325,10 @@ HMC5883::HMC5883(int bus) :
 	_reports(nullptr),
 	_range_scale(0), /* default range scale from counts to gauss */
 	_range_ga(1.3f),
-	_mag_topic(-1),
+	_collect_phase(false),
 	_class_instance(-1),
+	_mag_topic(-1),
+	_subsystem_pub(-1),
 	_sample_perf(perf_alloc(PC_ELAPSED, "hmc5883_read")),
 	_comms_errors(perf_alloc(PC_COUNT, "hmc5883_comms_errors")),
 	_buffer_overflows(perf_alloc(PC_COUNT, "hmc5883_buffer_overflows")),
@@ -713,7 +718,7 @@ HMC5883::cycle()
 
 		/* perform collection */
 		if (OK != collect()) {
-			log("collection error");
+			debug("collection error");
 			/* restart the measurement state machine */
 			start();
 			return;
@@ -740,7 +745,7 @@ HMC5883::cycle()
 
 	/* measurement phase */
 	if (OK != measure())
-		log("measure error");
+		debug("measure error");
 
 	/* next phase is collection */
 	_collect_phase = true;
@@ -870,6 +875,8 @@ HMC5883::collect()
 		}
 	}
 
+	_last_report = new_report;
+
 	/* post a report to the ring */
 	if (_reports->force(&new_report)) {
 		perf_count(_buffer_overflows);
@@ -1042,31 +1049,28 @@ int HMC5883::calibrate(struct file *filp, unsigned enable)
 
 	warnx("axes scaling: %.6f  %.6f  %.6f", (double)scaling[0], (double)scaling[1], (double)scaling[2]);
 
-	/* set back to normal mode */
-	/* Set to 1.1 Gauss */
-	if (OK != ::ioctl(fd, MAGIOCSRANGE, 1)) {
-		warnx("failed to set 1.1 Ga range");
-		goto out;
-	}
-
-	if (OK != ::ioctl(fd, MAGIOCEXSTRAP, 0)) {
-		warnx("failed to disable sensor calibration mode");
-		goto out;
-	}
-
 	/* set scaling in device */
 	mscale_previous.x_scale = scaling[0];
 	mscale_previous.y_scale = scaling[1];
 	mscale_previous.z_scale = scaling[2];
 
+	ret = OK;
+
+out:
+
 	if (OK != ioctl(filp, MAGIOCSSCALE, (long unsigned int)&mscale_previous)) {
 		warn("WARNING: failed to set new scale / offsets for mag");
-		goto out;
 	}
 
-	ret = OK;
+	/* set back to normal mode */
+	/* Set to 1.1 Gauss */
+	if (OK != ::ioctl(fd, MAGIOCSRANGE, 1)) {
+		warnx("failed to set 1.1 Ga range");
+	}
 
-out:
+	if (OK != ::ioctl(fd, MAGIOCEXSTRAP, 0)) {
+		warnx("failed to disable sensor calibration mode");
+	}
 
 	if (ret == OK) {
 		if (!check_scale()) {
@@ -1136,13 +1140,12 @@ int HMC5883::check_calibration()
 			true,
 			_calibrated,
 			SUBSYSTEM_TYPE_MAG};
-		static orb_advert_t pub = -1;
 
 		if (!(_pub_blocked)) {
-			if (pub > 0) {
-				orb_publish(ORB_ID(subsystem_info), pub, &info);
+			if (_subsystem_pub > 0) {
+				orb_publish(ORB_ID(subsystem_info), _subsystem_pub, &info);
 			} else {
-				pub = orb_advertise(ORB_ID(subsystem_info), &info);
+				_subsystem_pub = orb_advertise(ORB_ID(subsystem_info), &info);
 			}
 		}
 	}
@@ -1221,10 +1224,11 @@ HMC5883::print_info()
 	perf_print_counter(_comms_errors);
 	perf_print_counter(_buffer_overflows);
 	printf("poll interval:  %u ticks\n", _measure_ticks);
+	printf("output  (%.2f %.2f %.2f)\n", (double)_last_report.x, (double)_last_report.y, (double)_last_report.z);
 	printf("offsets (%.2f %.2f %.2f)\n", (double)_scale.x_offset, (double)_scale.y_offset, (double)_scale.z_offset);
 	printf("scaling (%.2f %.2f %.2f) 1/range_scale %.2f range_ga %.2f\n", 
 	       (double)_scale.x_scale, (double)_scale.y_scale, (double)_scale.z_scale,
-	       (double)1.0/_range_scale, (double)_range_ga);
+	       (double)(1.0f/_range_scale), (double)_range_ga);
 	_reports->print_info("report queue");
 }
 
diff --git a/src/drivers/hott/messages.cpp b/src/drivers/hott/messages.cpp
index 90a744015..1e779e8dc 100644
--- a/src/drivers/hott/messages.cpp
+++ b/src/drivers/hott/messages.cpp
@@ -51,6 +51,8 @@
 #include <uORB/topics/sensor_combined.h>
 #include <uORB/topics/vehicle_gps_position.h>
 
+#include <drivers/drv_hrt.h>
+
 /* The board is very roughly 5 deg warmer than the surrounding air */
 #define BOARD_TEMP_OFFSET_DEG 5
 
@@ -62,7 +64,6 @@ static int _airspeed_sub = -1;
 static int _esc_sub = -1;
 
 static orb_advert_t _esc_pub;
-struct esc_status_s _esc;
 
 static bool _home_position_set = false;
 static double _home_lat = 0.0d;
@@ -82,8 +83,6 @@ init_sub_messages(void)
 void 
 init_pub_messages(void)
 {
-	memset(&_esc, 0, sizeof(_esc));
-	_esc_pub = orb_advertise(ORB_ID(esc_status), &_esc);
 }
 
 void
@@ -106,23 +105,26 @@ publish_gam_message(const uint8_t *buffer)
 	size_t size = sizeof(msg);
 	memset(&msg, 0, size);
 	memcpy(&msg, buffer, size);
+	struct esc_status_s esc;
+	memset(&esc, 0, sizeof(esc));
+
+	// Publish it.
+	esc.timestamp = hrt_absolute_time();
+	esc.esc_count = 1;
+	esc.esc_connectiontype = ESC_CONNECTION_TYPE_PPM;
+
+	esc.esc[0].esc_vendor = ESC_VENDOR_GRAUPNER_HOTT;
+	esc.esc[0].esc_rpm = (uint16_t)((msg.rpm_H << 8) | (msg.rpm_L & 0xff)) * 10;
+	esc.esc[0].esc_temperature = msg.temperature1 - 20; 
+	esc.esc[0].esc_voltage = (uint16_t)((msg.main_voltage_H << 8) | (msg.main_voltage_L & 0xff));
+	esc.esc[0].esc_current = (uint16_t)((msg.current_H << 8) | (msg.current_L & 0xff));
 
 	/* announce the esc if needed, just publish else */
 	if (_esc_pub > 0) {
-		orb_publish(ORB_ID(esc_status), _esc_pub, &_esc);
+		orb_publish(ORB_ID(esc_status), _esc_pub, &esc);
 	} else {
-		_esc_pub = orb_advertise(ORB_ID(esc_status), &_esc);
+		_esc_pub = orb_advertise(ORB_ID(esc_status), &esc);
 	}
-
-	// Publish it.
-	_esc.esc_count = 1;
-	_esc.esc_connectiontype = ESC_CONNECTION_TYPE_PPM;
-
-	_esc.esc[0].esc_vendor = ESC_VENDOR_GRAUPNER_HOTT;
-	_esc.esc[0].esc_rpm = (uint16_t)((msg.rpm_H << 8) | (msg.rpm_L & 0xff)) * 10;
-	_esc.esc[0].esc_temperature = msg.temperature1 - 20; 
-	_esc.esc[0].esc_voltage = (uint16_t)((msg.main_voltage_H << 8) | (msg.main_voltage_L & 0xff));
-	_esc.esc[0].esc_current = (uint16_t)((msg.current_H << 8) | (msg.current_L & 0xff));
 }
 
 void 
diff --git a/src/drivers/l3gd20/l3gd20.cpp b/src/drivers/l3gd20/l3gd20.cpp
index 90c3db9ae..37e72388b 100644
--- a/src/drivers/l3gd20/l3gd20.cpp
+++ b/src/drivers/l3gd20/l3gd20.cpp
@@ -34,6 +34,9 @@
 /**
  * @file l3gd20.cpp
  * Driver for the ST L3GD20 MEMS gyro connected via SPI.
+ *
+ * Note: With the exception of the self-test feature, the ST L3G4200D is
+ *       also supported by this driver.
  */
 
 #include <nuttx/config.h>
@@ -89,9 +92,11 @@ static const int ERROR = -1;
 #define ADDR_WHO_AM_I			0x0F
 #define WHO_I_AM_H 				0xD7
 #define WHO_I_AM				0xD4
+#define WHO_I_AM_L3G4200D		0xD3	/* for L3G4200D */
 
 #define ADDR_CTRL_REG1			0x20
 #define REG1_RATE_LP_MASK			0xF0 /* Mask to guard partial register update */
+
 /* keep lowpass low to avoid noise issues */
 #define RATE_95HZ_LP_25HZ		((0<<7) | (0<<6) | (0<<5) | (1<<4))
 #define RATE_190HZ_LP_25HZ		((0<<7) | (1<<6) | (0<<5) | (1<<4))
@@ -166,9 +171,14 @@ static const int ERROR = -1;
 #define FIFO_CTRL_BYPASS_TO_STREAM_MODE		(1<<7)
 
 #define L3GD20_DEFAULT_RATE			760
+#define L3G4200D_DEFAULT_RATE			800
 #define L3GD20_DEFAULT_RANGE_DPS		2000
 #define L3GD20_DEFAULT_FILTER_FREQ		30
 
+#ifndef SENSOR_BOARD_ROTATION_DEFAULT
+#define SENSOR_BOARD_ROTATION_DEFAULT		SENSOR_BOARD_ROTATION_270_DEG
+#endif
+
 extern "C" { __EXPORT int l3gd20_main(int argc, char *argv[]); }
 
 class L3GD20 : public device::SPI
@@ -216,6 +226,9 @@ private:
 	math::LowPassFilter2p	_gyro_filter_y;
 	math::LowPassFilter2p	_gyro_filter_z;
 
+	/* true if an L3G4200D is detected */
+	bool	_is_l3g4200d;
+
 	/**
 	 * Start automatic measurement.
 	 */
@@ -324,14 +337,15 @@ L3GD20::L3GD20(int bus, const char* path, spi_dev_e device) :
 	_gyro_topic(-1),
 	_class_instance(-1),
 	_current_rate(0),
-	_orientation(SENSOR_BOARD_ROTATION_270_DEG),
+	_orientation(SENSOR_BOARD_ROTATION_DEFAULT),
 	_read(0),
 	_sample_perf(perf_alloc(PC_ELAPSED, "l3gd20_read")),
 	_reschedules(perf_alloc(PC_COUNT, "l3gd20_reschedules")),
 	_errors(perf_alloc(PC_COUNT, "l3gd20_errors")),
 	_gyro_filter_x(L3GD20_DEFAULT_RATE, L3GD20_DEFAULT_FILTER_FREQ),
 	_gyro_filter_y(L3GD20_DEFAULT_RATE, L3GD20_DEFAULT_FILTER_FREQ),
-	_gyro_filter_z(L3GD20_DEFAULT_RATE, L3GD20_DEFAULT_FILTER_FREQ)
+	_gyro_filter_z(L3GD20_DEFAULT_RATE, L3GD20_DEFAULT_FILTER_FREQ),
+	_is_l3g4200d(false)
 {
 	// enable debug() calls
 	_debug_enabled = true;
@@ -413,14 +427,7 @@ L3GD20::probe()
 	/* verify that the device is attached and functioning, accept L3GD20 and L3GD20H */
 	if (read_reg(ADDR_WHO_AM_I) == WHO_I_AM) {
 
-		#ifdef CONFIG_ARCH_BOARD_PX4FMU_V1
-			_orientation = SENSOR_BOARD_ROTATION_270_DEG;
-		#elif CONFIG_ARCH_BOARD_PX4FMU_V2
-			_orientation = SENSOR_BOARD_ROTATION_270_DEG;
-		#else
-			#error This driver needs a board selection, either CONFIG_ARCH_BOARD_PX4FMU_V1 or CONFIG_ARCH_BOARD_PX4FMU_V2
-		#endif
-
+		_orientation = SENSOR_BOARD_ROTATION_DEFAULT;
 		success = true;
 	}
 
@@ -430,6 +437,13 @@ L3GD20::probe()
 		success = true;
 	}
 
+	/* Detect the L3G4200D used on AeroCore */
+	if (read_reg(ADDR_WHO_AM_I) == WHO_I_AM_L3G4200D) {
+		_is_l3g4200d = true;
+		_orientation = SENSOR_BOARD_ROTATION_DEFAULT;
+		success = true;
+	}
+
 	if (success)
 		return OK;
 
@@ -502,6 +516,9 @@ L3GD20::ioctl(struct file *filp, int cmd, unsigned long arg)
 				/* set default/max polling rate */
 			case SENSOR_POLLRATE_MAX:
 			case SENSOR_POLLRATE_DEFAULT:
+				if (_is_l3g4200d) {
+					return ioctl(filp, SENSORIOCSPOLLRATE, L3G4200D_DEFAULT_RATE);
+				}
 				return ioctl(filp, SENSORIOCSPOLLRATE, L3GD20_DEFAULT_RATE);
 
 				/* adjust to a legal polling interval in Hz */
@@ -683,23 +700,26 @@ L3GD20::set_samplerate(unsigned frequency)
 	uint8_t bits = REG1_POWER_NORMAL | REG1_Z_ENABLE | REG1_Y_ENABLE | REG1_X_ENABLE;
 
 	if (frequency == 0)
-		frequency = 760;
+		frequency = _is_l3g4200d ? 800 : 760;
 
-	/* use limits good for H or non-H models */
+	/*
+	 * Use limits good for H or non-H models. Rates are slightly different
+	 * for L3G4200D part but register settings are the same.
+	 */
 	if (frequency <= 100) {
-		_current_rate = 95;
+		_current_rate = _is_l3g4200d ? 100 : 95;
 		bits |= RATE_95HZ_LP_25HZ;
 
 	} else if (frequency <= 200) {
-		_current_rate = 190;
+		_current_rate = _is_l3g4200d ? 200 : 190;
 		bits |= RATE_190HZ_LP_50HZ;
 
 	} else if (frequency <= 400) {
-		_current_rate = 380;
+		_current_rate = _is_l3g4200d ? 400 : 380;
 		bits |= RATE_380HZ_LP_50HZ;
 
 	} else if (frequency <= 800) {
-		_current_rate = 760;
+		_current_rate = _is_l3g4200d ? 800 : 760;
 		bits |= RATE_760HZ_LP_50HZ;
 	} else {
 		return -EINVAL;
@@ -772,7 +792,7 @@ L3GD20::reset()
 	 * callback fast enough to not miss data. */
 	write_reg(ADDR_FIFO_CTRL_REG, FIFO_CTRL_BYPASS_MODE);
 
-	set_samplerate(0); // 760Hz
+	set_samplerate(0); // 760Hz or 800Hz
 	set_range(L3GD20_DEFAULT_RANGE_DPS);
 	set_driver_lowpass_filter(L3GD20_DEFAULT_RATE, L3GD20_DEFAULT_FILTER_FREQ);
 
@@ -971,7 +991,7 @@ start()
 		errx(0, "already started");
 
 	/* create the driver */
-	g_dev = new L3GD20(1 /* SPI bus 1 */, L3GD20_DEVICE_PATH, (spi_dev_e)PX4_SPIDEV_GYRO);
+	g_dev = new L3GD20(PX4_SPI_BUS_SENSORS, L3GD20_DEVICE_PATH, (spi_dev_e)PX4_SPIDEV_GYRO);
 
 	if (g_dev == nullptr)
 		goto fail;
diff --git a/src/drivers/lsm303d/lsm303d.cpp b/src/drivers/lsm303d/lsm303d.cpp
index 4dee7649b..8bf76dcc3 100644
--- a/src/drivers/lsm303d/lsm303d.cpp
+++ b/src/drivers/lsm303d/lsm303d.cpp
@@ -880,7 +880,7 @@ LSM303D::mag_read(struct file *filp, char *buffer, size_t buflen)
 
 	/* manual measurement */
 	_mag_reports->flush();
-	measure();
+	_mag->measure();
 
 	/* measurement will have generated a report, copy it out */
 	if (_mag_reports->get(mrb))
@@ -1793,7 +1793,7 @@ start()
 		errx(0, "already started");
 
 	/* create the driver */
-	g_dev = new LSM303D(1 /* SPI dev 1 */, LSM303D_DEVICE_PATH_ACCEL, (spi_dev_e)PX4_SPIDEV_ACCEL_MAG);
+	g_dev = new LSM303D(PX4_SPI_BUS_SENSORS, LSM303D_DEVICE_PATH_ACCEL, (spi_dev_e)PX4_SPIDEV_ACCEL_MAG);
 
 	if (g_dev == nullptr) {
 		warnx("failed instantiating LSM303D obj");
diff --git a/src/drivers/meas_airspeed/meas_airspeed.cpp b/src/drivers/meas_airspeed/meas_airspeed.cpp
index 2c3efdc35..c0f3c28e0 100644
--- a/src/drivers/meas_airspeed/meas_airspeed.cpp
+++ b/src/drivers/meas_airspeed/meas_airspeed.cpp
@@ -87,6 +87,7 @@
 #include <uORB/uORB.h>
 #include <uORB/topics/differential_pressure.h>
 #include <uORB/topics/subsystem_info.h>
+#include <uORB/topics/system_power.h>
 
 #include <drivers/airspeed/airspeed.h>
 
@@ -121,6 +122,14 @@ protected:
 	virtual int	collect();
 
 	math::LowPassFilter2p	_filter;
+
+	/**
+	 * Correct for 5V rail voltage variations
+	 */
+	void voltage_correction(float &diff_pres_pa, float &temperature);
+
+	int _t_system_power;
+	struct system_power_s system_power;
 };
 
 /*
@@ -129,10 +138,11 @@ protected:
 extern "C" __EXPORT int meas_airspeed_main(int argc, char *argv[]);
 
 MEASAirspeed::MEASAirspeed(int bus, int address, const char *path) : Airspeed(bus, address,
-			CONVERSION_INTERVAL, path),
-			_filter(MEAS_RATE, MEAS_DRIVER_FILTER_FREQ)
+	CONVERSION_INTERVAL, path),
+	_filter(MEAS_RATE, MEAS_DRIVER_FILTER_FREQ),
+	_t_system_power(-1)
 {
-
+	memset(&system_power, 0, sizeof(system_power));
 }
 
 int
@@ -194,19 +204,48 @@ MEASAirspeed::collect()
 	dp_raw = 0x3FFF & dp_raw;
 	dT_raw = (val[2] << 8) + val[3];
 	dT_raw = (0xFFE0 & dT_raw) >> 5;
-	float temperature = ((200 * dT_raw) / 2047) - 50;
+	float temperature = ((200.0f * dT_raw) / 2047) - 50;
 
-	/* calculate differential pressure. As its centered around 8000
-	 * and can go positive or negative, enforce absolute value
-	*/
+	// Calculate differential pressure. As its centered around 8000
+	// and can go positive or negative
 	const float P_min = -1.0f;
 	const float P_max = 1.0f;
-	float diff_press_pa = fabsf((((float)dp_raw - 0.1f * 16383.0f) * (P_max - P_min) / (0.8f * 16383.0f) + P_min) * 6894.8f) - _diff_pres_offset;
+	const float PSI_to_Pa = 6894.757f;
+	/*
+	  this equation is an inversion of the equation in the
+	  pressure transfer function figure on page 4 of the datasheet
 
-	if (diff_press_pa < 0.0f) {
-		diff_press_pa = 0.0f;
-	}
+	  We negate the result so that positive differential pressures
+	  are generated when the bottom port is used as the static
+	  port on the pitot and top port is used as the dynamic port
+	 */
+	float diff_press_PSI = -((dp_raw - 0.1f*16383) * (P_max-P_min)/(0.8f*16383) + P_min);
+	float diff_press_pa_raw = diff_press_PSI * PSI_to_Pa;
+
+        // correct for 5V rail voltage if possible
+        voltage_correction(diff_press_pa_raw, temperature);
 
+	float diff_press_pa = fabsf(diff_press_pa_raw - _diff_pres_offset);
+	
+	/*
+	  note that we return both the absolute value with offset
+	  applied and a raw value without the offset applied. This
+	  makes it possible for higher level code to detect if the
+	  user has the tubes connected backwards, and also makes it
+	  possible to correctly use offsets calculated by a higher
+	  level airspeed driver.
+
+	  With the above calculation the MS4525 sensor will produce a
+	  positive number when the top port is used as a dynamic port
+	  and bottom port is used as the static port
+
+	  Also note that the _diff_pres_offset is applied before the
+	  fabsf() not afterwards. It needs to be done this way to
+	  prevent a bias at low speeds, but this also means that when
+	  setting a offset you must set it based on the raw value, not
+	  the offset value
+	 */
+	
 	struct differential_pressure_s report;
 
 	/* track maximum differential pressure measured (so we can work out top speed). */
@@ -219,6 +258,13 @@ MEASAirspeed::collect()
 	report.temperature = temperature;
 	report.differential_pressure_pa = diff_press_pa;
 	report.differential_pressure_filtered_pa =  _filter.apply(diff_press_pa);
+
+	/* the dynamics of the filter can make it overshoot into the negative range */
+	if (report.differential_pressure_filtered_pa < 0.0f) {
+		report.differential_pressure_filtered_pa = _filter.reset(diff_press_pa);
+	}
+
+	report.differential_pressure_raw_pa = diff_press_pa_raw;
 	report.voltage = 0;
 	report.max_differential_pressure_pa = _max_differential_pressure_pa;
 
@@ -242,13 +288,17 @@ MEASAirspeed::collect()
 void
 MEASAirspeed::cycle()
 {
+	int ret;
+
 	/* collection phase? */
 	if (_collect_phase) {
 
 		/* perform collection */
-		if (OK != collect()) {
+		ret = collect();
+		if (OK != ret) {
 			/* restart the measurement state machine */
 			start();
+			_sensor_ok = false;
 			return;
 		}
 
@@ -272,10 +322,13 @@ MEASAirspeed::cycle()
 	}
 
 	/* measurement phase */
-	if (OK != measure()) {
-		log("measure error");
+	ret = measure();
+	if (OK != ret) {
+		debug("measure error");
 	}
 
+	_sensor_ok = (ret == OK);
+
 	/* next phase is collection */
 	_collect_phase = true;
 
@@ -288,6 +341,62 @@ MEASAirspeed::cycle()
 }
 
 /**
+   correct for 5V rail voltage if the system_power ORB topic is
+   available
+   
+   See http://uav.tridgell.net/MS4525/MS4525-offset.png for a graph of
+   offset versus voltage for 3 sensors
+ */
+void
+MEASAirspeed::voltage_correction(float &diff_press_pa, float &temperature)
+{
+#ifdef CONFIG_ARCH_BOARD_PX4FMU_V2
+	if (_t_system_power == -1) {
+		_t_system_power = orb_subscribe(ORB_ID(system_power));
+	}
+	if (_t_system_power == -1) {
+		// not available
+		return;
+	}
+	bool updated = false;
+	orb_check(_t_system_power, &updated);
+	if (updated) {
+		orb_copy(ORB_ID(system_power), _t_system_power, &system_power);
+	}
+	if (system_power.voltage5V_v < 3.0f || system_power.voltage5V_v > 6.0f) {
+		// not valid, skip correction
+		return;
+	}
+
+	const float slope = 65.0f;
+	/*
+	  apply a piecewise linear correction, flattening at 0.5V from 5V
+	 */
+	float voltage_diff = system_power.voltage5V_v - 5.0f;
+	if (voltage_diff > 0.5f) {
+		voltage_diff = 0.5f;
+	}
+	if (voltage_diff < -0.5f) {
+		voltage_diff = -0.5f;
+	}
+	diff_press_pa -= voltage_diff * slope;
+
+	/*
+	  the temperature masurement varies as well
+	 */
+	const float temp_slope = 0.887f;
+	voltage_diff = system_power.voltage5V_v - 5.0f;
+	if (voltage_diff > 0.5f) {
+		voltage_diff = 0.5f;
+	}
+	if (voltage_diff < -1.0f) {
+		voltage_diff = -1.0f;
+	}
+	temperature -= voltage_diff * temp_slope;	
+#endif // CONFIG_ARCH_BOARD_PX4FMU_V2
+}
+
+/**
  * Local functions in support of the shell command.
  */
 namespace meas_airspeed
@@ -409,7 +518,7 @@ test()
 	}
 
 	warnx("single read");
-	warnx("diff pressure: %8.4f pa", (double)report.differential_pressure_pa);
+	warnx("diff pressure: %d pa", (int)report.differential_pressure_pa);
 
 	/* start the sensor polling at 2Hz */
 	if (OK != ioctl(fd, SENSORIOCSPOLLRATE, 2)) {
@@ -437,7 +546,7 @@ test()
 		}
 
 		warnx("periodic read %u", i);
-		warnx("diff pressure: %8.4f pa", (double)report.differential_pressure_pa);
+		warnx("diff pressure: %d pa", (int)report.differential_pressure_pa);
 		warnx("temperature: %d C (0x%02x)", (int)report.temperature, (unsigned) report.temperature);
 	}
 
diff --git a/src/drivers/mkblctrl/mkblctrl.cpp b/src/drivers/mkblctrl/mkblctrl.cpp
index 705e98eea..3996b76a6 100644
--- a/src/drivers/mkblctrl/mkblctrl.cpp
+++ b/src/drivers/mkblctrl/mkblctrl.cpp
@@ -92,8 +92,20 @@
 #define MOTOR_SPINUP_COUNTER			30
 #define ESC_UORB_PUBLISH_DELAY		500000
 
-
-
+struct MotorData_t {
+	unsigned int Version;                        // the version of the BL (0 = old)
+	unsigned int SetPoint;                       // written by attitude controller
+	unsigned int SetPointLowerBits;      // for higher Resolution of new BLs
+	float SetPoint_PX4; 			     // Values from PX4
+	unsigned int State;                          // 7 bit for I2C error counter, highest bit indicates if motor is present
+	unsigned int ReadMode;                       // select data to read
+	unsigned short RawPwmValue;							// length of PWM pulse
+	// the following bytes must be exactly in that order!
+	unsigned int Current;                        // in 0.1 A steps, read back from BL
+	unsigned int MaxPWM;                         // read back from BL is less than 255 if BL is in current limit
+	unsigned int Temperature;            // old BL-Ctrl will return a 255 here, the new version the temp. in
+	unsigned int RoundCount;
+};
 
 class MK : public device::I2C
 {
@@ -119,8 +131,8 @@ public:
 	int		set_motor_count(unsigned count);
 	int		set_motor_test(bool motortest);
 	int		set_overrideSecurityChecks(bool overrideSecurityChecks);
-	int		set_px4mode(int px4mode);
-	int		set_frametype(int frametype);
+	void		set_px4mode(int px4mode);
+	void		set_frametype(int frametype);
 	unsigned int		mk_check_for_blctrl(unsigned int count, bool showOutput, bool initI2C);
 
 private:
@@ -154,8 +166,10 @@ private:
 
 	actuator_controls_s _controls;
 
+	MotorData_t Motor[MAX_MOTORS];
+
 	static void	task_main_trampoline(int argc, char *argv[]);
-	void		task_main() __attribute__((noreturn));
+	void		task_main();
 
 	static int	control_callback(uintptr_t handle,
 					 uint8_t control_group,
@@ -195,24 +209,6 @@ const int blctrlAddr_px4[]  = { 0, 0, 0, 0, 0, 0, 0, 0};
 
 int addrTranslator[] = {0, 0, 0, 0, 0, 0, 0, 0};
 
-struct MotorData_t {
-	unsigned int Version;                        // the version of the BL (0 = old)
-	unsigned int SetPoint;                       // written by attitude controller
-	unsigned int SetPointLowerBits;      // for higher Resolution of new BLs
-	float SetPoint_PX4; 			     // Values from PX4
-	unsigned int State;                          // 7 bit for I2C error counter, highest bit indicates if motor is present
-	unsigned int ReadMode;                       // select data to read
-	unsigned short RawPwmValue;							// length of PWM pulse
-	// the following bytes must be exactly in that order!
-	unsigned int Current;                        // in 0.1 A steps, read back from BL
-	unsigned int MaxPWM;                         // read back from BL is less than 255 if BL is in current limit
-	unsigned int Temperature;            // old BL-Ctrl will return a 255 here, the new version the temp. in
-	unsigned int RoundCount;
-};
-
-MotorData_t Motor[MAX_MOTORS];
-
-
 namespace
 {
 
@@ -226,15 +222,15 @@ MK::MK(int bus, const char *_device_path) :
 	_task(-1),
 	_t_actuators(-1),
 	_t_actuator_armed(-1),
+	_motor(-1),
+	_px4mode(MAPPING_MK),
+	_frametype(FRAME_PLUS),
 	_t_outputs(0),
 	_t_esc_status(0),
 	_num_outputs(0),
+	_primary_pwm_device(false),
 	_motortest(false),
 	_overrideSecurityChecks(false),
-	_motor(-1),
-	_px4mode(MAPPING_MK),
-	_frametype(FRAME_PLUS),
-	_primary_pwm_device(false),
 	_task_should_exit(false),
 	_armed(false),
 	_mixers(nullptr)
@@ -334,13 +330,13 @@ MK::set_update_rate(unsigned rate)
 	return OK;
 }
 
-int
+void
 MK::set_px4mode(int px4mode)
 {
 	_px4mode = px4mode;
 }
 
-int
+void
 MK::set_frametype(int frametype)
 {
 	_frametype = frametype;
@@ -444,9 +440,6 @@ MK::scaling(float val, float inMin, float inMax, float outMin, float outMax)
 void
 MK::task_main()
 {
-	long update_rate_in_us = 0;
-	float tmpVal = 0;
-
 	/*
 	 * Subscribe to the appropriate PWM output topic based on whether we are the
 	 * primary PWM output or not.
@@ -487,7 +480,6 @@ MK::task_main()
 		/* handle update rate changes */
 		if (_current_update_rate != _update_rate) {
 			int update_rate_in_ms = int(1000 / _update_rate);
-			update_rate_in_us = long(1000000 / _update_rate);
 
 			/* reject faster than 500 Hz updates */
 			if (update_rate_in_ms < 2) {
@@ -739,7 +731,6 @@ MK::mk_servo_set(unsigned int chan, short val)
 	_retries = 0;
 	uint8_t result[3] = { 0, 0, 0 };
 	uint8_t msg[2] = { 0, 0 };
-	uint8_t rod = 0;
 	uint8_t bytesToSendBL2 = 2;
 
 	tmpVal = val;
@@ -828,7 +819,7 @@ MK::mk_servo_set(unsigned int chan, short val)
 		if (debugCounter == 2000) {
 			debugCounter = 0;
 
-			for (int i = 0; i < _num_outputs; i++) {
+			for (unsigned int i = 0; i < _num_outputs; i++) {
 				if (Motor[i].State & MOTOR_STATE_PRESENT_MASK) {
 					fprintf(stderr, "[mkblctrl] #%i:\tVer: %i\tVal: %i\tCurr: %i\tMaxPWM: %i\tTemp: %i\tState: %i\n", i, Motor[i].Version, Motor[i].SetPoint, Motor[i].Current, Motor[i].MaxPWM, Motor[i].Temperature, Motor[i].State);
 				}
@@ -1015,7 +1006,7 @@ MK::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 
 	case PWM_SERVO_GET(0) ... PWM_SERVO_GET(_max_actuators - 1):
 		/* copy the current output value from the channel */
-		*(servo_position_t *)arg = Motor[cmd - PWM_SERVO_SET(0)].RawPwmValue;
+		*(servo_position_t *)arg = Motor[cmd - PWM_SERVO_GET(0)].RawPwmValue;
 
 		break;
 
@@ -1173,7 +1164,7 @@ mk_new_mode(int update_rate, int motorcount, bool motortest, int px4mode, int fr
 }
 
 int
-mk_start(unsigned motors, char *device_path)
+mk_start(unsigned motors, const char *device_path)
 {
 	int ret;
 
@@ -1232,7 +1223,7 @@ mkblctrl_main(int argc, char *argv[])
 	bool overrideSecurityChecks = false;
 	bool showHelp = false;
 	bool newMode = false;
-	char *devicepath = "";
+	const char *devicepath = "";
 
 	/*
 	 * optional parameters
diff --git a/src/drivers/mpu6000/mpu6000.cpp b/src/drivers/mpu6000/mpu6000.cpp
index ac75682c4..0edec3d0e 100644
--- a/src/drivers/mpu6000/mpu6000.cpp
+++ b/src/drivers/mpu6000/mpu6000.cpp
@@ -544,7 +544,7 @@ void MPU6000::reset()
 	write_reg(MPUREG_USER_CTRL, BIT_I2C_IF_DIS);
         irqrestore(state);
 
-	up_udelay(1000);
+	usleep(1000);
 
 	// SAMPLE RATE
 	_set_sample_rate(_sample_rate);
@@ -1380,7 +1380,6 @@ MPU6000_gyro::init()
 
 	_gyro_class_instance = register_class_devname(GYRO_DEVICE_PATH);
 
-out:
 	return ret;
 }
 
diff --git a/src/drivers/ms5611/ms5611.cpp b/src/drivers/ms5611/ms5611.cpp
index 0ef056273..1ce93aeea 100644
--- a/src/drivers/ms5611/ms5611.cpp
+++ b/src/drivers/ms5611/ms5611.cpp
@@ -526,6 +526,7 @@ void
 MS5611::cycle()
 {
 	int ret;
+	unsigned dummy;
 
 	/* collection phase? */
 	if (_collect_phase) {
@@ -542,6 +543,8 @@ MS5611::cycle()
 			} else {
 				//log("collection error %d", ret);
 			}
+			/* issue a reset command to the sensor */
+			_interface->ioctl(IOCTL_RESET, dummy);
 			/* reset the collection state machine and try again */
 			start_cycle();
 			return;
@@ -573,6 +576,8 @@ MS5611::cycle()
 	ret = measure();
 	if (ret != OK) {
 		//log("measure error %d", ret);
+		/* issue a reset command to the sensor */
+		_interface->ioctl(IOCTL_RESET, dummy);
 		/* reset the collection state machine and try again */
 		start_cycle();
 		return;
@@ -748,8 +753,8 @@ MS5611::print_info()
 	printf("TEMP:           %d\n", _TEMP);
 	printf("SENS:           %lld\n", _SENS);
 	printf("OFF:            %lld\n", _OFF);
-	printf("P:              %.3f\n", _P);
-	printf("T:              %.3f\n", _T);
+	printf("P:              %.3f\n", (double)_P);
+	printf("T:              %.3f\n", (double)_T);
 	printf("MSL pressure:   %10.4f\n", (double)(_msl_pressure / 100.f));
 
 	printf("factory_setup             %u\n", _prom.factory_setup);
diff --git a/src/drivers/ms5611/ms5611_spi.cpp b/src/drivers/ms5611/ms5611_spi.cpp
index 26216e840..8759d16a1 100644
--- a/src/drivers/ms5611/ms5611_spi.cpp
+++ b/src/drivers/ms5611/ms5611_spi.cpp
@@ -117,7 +117,7 @@ private:
 device::Device *
 MS5611_spi_interface(ms5611::prom_u &prom_buf)
 {
-	return new MS5611_SPI(1 /* XXX MAGIC NUMBER */, (spi_dev_e)PX4_SPIDEV_BARO, prom_buf);
+	return new MS5611_SPI(PX4_SPI_BUS_SENSORS, (spi_dev_e)PX4_SPIDEV_BARO, prom_buf);
 }
 
 MS5611_SPI::MS5611_SPI(int bus, spi_dev_e device, ms5611::prom_u &prom_buf) :
diff --git a/src/drivers/pca8574/module.mk b/src/drivers/pca8574/module.mk
new file mode 100644
index 000000000..825ee9bb7
--- /dev/null
+++ b/src/drivers/pca8574/module.mk
@@ -0,0 +1,6 @@
+#
+# PCA8574 driver for RGB LED
+#
+
+MODULE_COMMAND	 = pca8574
+SRCS		 = pca8574.cpp
diff --git a/src/drivers/pca8574/pca8574.cpp b/src/drivers/pca8574/pca8574.cpp
new file mode 100644
index 000000000..904ce18e8
--- /dev/null
+++ b/src/drivers/pca8574/pca8574.cpp
@@ -0,0 +1,554 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2012-2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file pca8574.cpp
+ *
+ * Driver for an 8 I/O controller (PC8574) connected via I2C.
+ *
+ * @author Lorenz Meier <lm@inf.ethz.ch>
+ * @author Julian Oes <joes@student.ethz.ch>
+ * @author Anton Babushkin <anton.babushkin@me.com>
+ */
+
+#include <nuttx/config.h>
+
+#include <drivers/device/i2c.h>
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <ctype.h>
+
+#include <nuttx/wqueue.h>
+
+#include <systemlib/perf_counter.h>
+#include <systemlib/err.h>
+#include <systemlib/systemlib.h>
+
+#include <board_config.h>
+
+#include <drivers/drv_io_expander.h>
+
+#define PCA8574_ONTIME 120
+#define PCA8574_OFFTIME 120
+#define PCA8574_DEVICE_PATH "/dev/pca8574"
+
+#define ADDR			0x20	///< I2C adress of PCA8574 (default, A0-A2 pulled to GND)
+
+class PCA8574 : public device::I2C
+{
+public:
+	PCA8574(int bus, int pca8574);
+	virtual ~PCA8574();
+
+
+	virtual int		init();
+	virtual int		probe();
+	virtual int		info();
+	virtual int		ioctl(struct file *filp, int cmd, unsigned long arg);
+	bool			is_running() { return _running; }
+
+private:
+	work_s			_work;
+
+	uint8_t			_values_out;
+	uint8_t			_values_in;
+	uint8_t			_blinking;
+	uint8_t			_blink_phase;
+
+	enum IOX_MODE		_mode;
+	bool			_running;
+	int			_led_interval;
+	bool			_should_run;
+	bool			_update_out;
+	int			_counter;
+
+	static void		led_trampoline(void *arg);
+	void			led();
+
+	int			send_led_enable(uint8_t arg);
+	int			send_led_values();
+
+	int			get(uint8_t &vals);
+};
+
+/* for now, we only support one PCA8574 */
+namespace
+{
+PCA8574 *g_pca8574;
+}
+
+void pca8574_usage();
+
+extern "C" __EXPORT int pca8574_main(int argc, char *argv[]);
+
+PCA8574::PCA8574(int bus, int pca8574) :
+	I2C("pca8574", PCA8574_DEVICE_PATH, bus, pca8574, 100000),
+	_values_out(0),
+	_values_in(0),
+	_blinking(0),
+	_blink_phase(0),
+	_mode(IOX_MODE_OFF),
+	_running(false),
+	_led_interval(80),
+	_should_run(false),
+	_update_out(false),
+	_counter(0)
+{
+	memset(&_work, 0, sizeof(_work));
+}
+
+PCA8574::~PCA8574()
+{
+}
+
+int
+PCA8574::init()
+{
+	int ret;
+	ret = I2C::init();
+
+	if (ret != OK) {
+		return ret;
+	}
+
+	return OK;
+}
+
+int
+PCA8574::probe()
+{
+	uint8_t val;
+	return get(val);
+}
+
+int
+PCA8574::info()
+{
+	int ret = OK;
+
+	return ret;
+}
+
+int
+PCA8574::ioctl(struct file *filp, int cmd, unsigned long arg)
+{
+	int ret = ENOTTY;
+
+	switch (cmd) {
+	case IOX_SET_VALUE ...(IOX_SET_VALUE + 8): {
+			// set the specified on / off state
+			uint8_t position = (1 << (cmd - IOX_SET_VALUE));
+			uint8_t prev = _values_out;
+
+			if (arg) {
+				_values_out |= position;
+
+			} else {
+				_values_out &= ~(position);
+			}
+
+			if (_values_out != prev) {
+				if (_values_out) {
+					_mode = IOX_MODE_ON;
+				}
+				send_led_values();
+			}
+
+			return OK;
+		}
+
+	case IOX_SET_MASK:
+		send_led_enable(arg);
+		return OK;
+
+	case IOX_GET_MASK: {
+			uint8_t val;
+			ret = get(val);
+
+			if (ret == OK) {
+				return val;
+
+			} else {
+				return -1;
+			}
+		}
+
+	case IOX_SET_MODE:
+
+		if (_mode != (IOX_MODE)arg) {
+
+			switch ((IOX_MODE)arg) {
+			case IOX_MODE_OFF:
+				_values_out = 0xFF;
+				break;
+
+			case IOX_MODE_ON:
+				_values_out = 0;
+				break;
+
+			case IOX_MODE_TEST_OUT:
+				break;
+
+			default:
+				return -1;
+			}
+
+			_mode = (IOX_MODE)arg;
+			send_led_values();
+		}
+
+		return OK;
+
+	default:
+		// see if the parent class can make any use of it
+		ret = CDev::ioctl(filp, cmd, arg);
+		break;
+	}
+
+	return ret;
+}
+
+
+void
+PCA8574::led_trampoline(void *arg)
+{
+	PCA8574 *rgbl = reinterpret_cast<PCA8574 *>(arg);
+
+	rgbl->led();
+}
+
+/**
+ * Main loop function
+ */
+void
+PCA8574::led()
+{
+	if (_mode == IOX_MODE_TEST_OUT) {
+
+		// we count only seven states
+		_counter &= 0xF;
+		_counter++;
+
+		for (int i = 0; i < 8; i++) {
+			if (i < _counter) {
+				_values_out |= (1 << i);
+
+			} else {
+				_values_out &= ~(1 << i);
+			}
+		}
+
+		_update_out = true;
+		_should_run = true;
+	} else if (_mode == IOX_MODE_OFF) {
+		_update_out = true;
+		_should_run = false;
+	} else {
+
+		// Any of the normal modes
+		if (_blinking > 0) {
+			/* we need to be running to blink */
+			_should_run = true;
+		} else {
+			_should_run = false;
+		}
+	}
+
+	if (_update_out) {
+		uint8_t msg;
+
+		if (_blinking) {
+			msg = (_values_out & _blinking & _blink_phase);
+
+			// wipe out all positions that are marked as blinking
+			msg &= ~(_blinking);
+
+			// fill blink positions
+			msg |= ((_blink_phase) ? _blinking : 0);
+
+			_blink_phase = !_blink_phase;
+		} else {
+			msg = _values_out;
+		}
+
+		int ret = transfer(&msg, sizeof(msg), nullptr, 0);
+
+		if (!ret) {
+			_update_out = false;
+		}
+	}
+
+	// check if any activity remains, else stp
+	if (!_should_run) {
+		_running = false;
+		return;
+	}
+
+	// re-queue ourselves to run again later
+	_running = true;
+	work_queue(LPWORK, &_work, (worker_t)&PCA8574::led_trampoline, this, _led_interval);
+}
+
+/**
+ * Sent ENABLE flag to LED driver
+ */
+int
+PCA8574::send_led_enable(uint8_t arg)
+{
+
+	int ret = transfer(&arg, sizeof(arg), nullptr, 0);
+
+	return ret;
+}
+
+/**
+ * Send 8 outputs
+ */
+int
+PCA8574::send_led_values()
+{
+	_update_out = true;
+
+	// if not active, kick it
+	if (!_running) {
+		_running = true;
+		work_queue(LPWORK, &_work, (worker_t)&PCA8574::led_trampoline, this, 1);
+	}
+
+	return 0;
+}
+
+int
+PCA8574::get(uint8_t &vals)
+{
+	uint8_t result;
+	int ret;
+
+	ret = transfer(nullptr, 0, &result, 1);
+
+	if (ret == OK) {
+		_values_in = result;
+		vals = result;
+	}
+
+	return ret;
+}
+
+void
+pca8574_usage()
+{
+	warnx("missing command: try 'start', 'test', 'info', 'off', 'stop', 'val 0 1'");
+	warnx("options:");
+	warnx("    -b i2cbus (%d)", PX4_I2C_BUS_LED);
+	warnx("    -a addr (0x%x)", ADDR);
+}
+
+int
+pca8574_main(int argc, char *argv[])
+{
+	int i2cdevice = -1;
+	int pca8574adr = ADDR; // 7bit
+
+	int ch;
+
+	// jump over start/off/etc and look at options first
+	while ((ch = getopt(argc, argv, "a:b:")) != EOF) {
+		switch (ch) {
+		case 'a':
+			pca8574adr = strtol(optarg, NULL, 0);
+			break;
+
+		case 'b':
+			i2cdevice = strtol(optarg, NULL, 0);
+			break;
+
+		default:
+			pca8574_usage();
+			exit(0);
+		}
+	}
+
+	if (optind >= argc) {
+		pca8574_usage();
+		exit(1);
+	}
+
+	const char *verb = argv[optind];
+
+	int fd;
+	int ret;
+
+	if (!strcmp(verb, "start")) {
+		if (g_pca8574 != nullptr) {
+			errx(1, "already started");
+		}
+
+		if (i2cdevice == -1) {
+			// try the external bus first
+			i2cdevice = PX4_I2C_BUS_EXPANSION;
+			g_pca8574 = new PCA8574(PX4_I2C_BUS_EXPANSION, pca8574adr);
+
+			if (g_pca8574 != nullptr && OK != g_pca8574->init()) {
+				delete g_pca8574;
+				g_pca8574 = nullptr;
+			}
+
+			if (g_pca8574 == nullptr) {
+				// fall back to default bus
+				if (PX4_I2C_BUS_LED == PX4_I2C_BUS_EXPANSION) {
+					errx(1, "init failed");
+				}
+
+				i2cdevice = PX4_I2C_BUS_LED;
+			}
+		}
+
+		if (g_pca8574 == nullptr) {
+			g_pca8574 = new PCA8574(i2cdevice, pca8574adr);
+
+			if (g_pca8574 == nullptr) {
+				errx(1, "new failed");
+			}
+
+			if (OK != g_pca8574->init()) {
+				delete g_pca8574;
+				g_pca8574 = nullptr;
+				errx(1, "init failed");
+			}
+		}
+
+		exit(0);
+	}
+
+	// need the driver past this point
+	if (g_pca8574 == nullptr) {
+		warnx("not started, run pca8574 start");
+		exit(1);
+	}
+
+	if (!strcmp(verb, "test")) {
+		fd = open(PCA8574_DEVICE_PATH, 0);
+
+		if (fd == -1) {
+			errx(1, "Unable to open " PCA8574_DEVICE_PATH);
+		}
+
+		ret = ioctl(fd, IOX_SET_MODE, (unsigned long)IOX_MODE_TEST_OUT);
+
+		close(fd);
+		exit(ret);
+	}
+
+	if (!strcmp(verb, "info")) {
+		g_pca8574->info();
+		exit(0);
+	}
+
+	if (!strcmp(verb, "off")) {
+		fd = open(PCA8574_DEVICE_PATH, 0);
+
+		if (fd < 0) {
+			errx(1, "Unable to open " PCA8574_DEVICE_PATH);
+		}
+
+		ret = ioctl(fd, IOX_SET_MODE, (unsigned long)IOX_MODE_OFF);
+		close(fd);
+		exit(ret);
+	}
+
+	if (!strcmp(verb, "stop")) {
+		fd = open(PCA8574_DEVICE_PATH, 0);
+
+		if (fd == -1) {
+			errx(1, "Unable to open " PCA8574_DEVICE_PATH);
+		}
+
+		ret = ioctl(fd, IOX_SET_MODE, (unsigned long)IOX_MODE_OFF);
+		close(fd);
+
+		// wait until we're not running any more
+		for (unsigned i = 0; i < 15; i++) {
+			if (!g_pca8574->is_running()) {
+				break;
+			}
+
+			usleep(50000);
+			printf(".");
+			fflush(stdout);
+		}
+		printf("\n");
+		fflush(stdout);
+
+		if (!g_pca8574->is_running()) {
+			delete g_pca8574;
+			g_pca8574 = nullptr;
+			exit(0);
+		} else {
+			warnx("stop failed.");
+			exit(1);
+		}
+	}
+
+	if (!strcmp(verb, "val")) {
+		if (argc < 4) {
+			errx(1, "Usage: pca8574 val <channel> <0 or 1>");
+		}
+
+		fd = open(PCA8574_DEVICE_PATH, 0);
+
+		if (fd == -1) {
+			errx(1, "Unable to open " PCA8574_DEVICE_PATH);
+		}
+
+		unsigned channel = strtol(argv[2], NULL, 0);
+		unsigned val = strtol(argv[3], NULL, 0);
+
+		if (channel < 8) {
+			ret = ioctl(fd, (IOX_SET_VALUE + channel), val);
+		} else {
+			ret = -1;
+		}
+		close(fd);
+		exit(ret);
+	}
+
+	pca8574_usage();
+	exit(0);
+}
diff --git a/src/drivers/px4fmu/fmu.cpp b/src/drivers/px4fmu/fmu.cpp
index a70ff6c5c..0a4635728 100644
--- a/src/drivers/px4fmu/fmu.cpp
+++ b/src/drivers/px4fmu/fmu.cpp
@@ -92,6 +92,7 @@ public:
 		MODE_2PWM,
 		MODE_4PWM,
 		MODE_6PWM,
+		MODE_8PWM,
 	};
 	PX4FMU();
 	virtual ~PX4FMU();
@@ -113,6 +114,9 @@ private:
 #if defined(CONFIG_ARCH_BOARD_PX4FMU_V2)
 	static const unsigned _max_actuators = 6;
 #endif
+#if defined(CONFIG_ARCH_BOARD_AEROCORE)
+	static const unsigned _max_actuators = 8;
+#endif
 
 	Mode		_mode;
 	unsigned	_pwm_default_rate;
@@ -120,19 +124,25 @@ private:
 	uint32_t	_pwm_alt_rate_channels;
 	unsigned	_current_update_rate;
 	int		_task;
-	int		_t_actuators;
-	int		_t_actuator_armed;
-	orb_advert_t	_t_outputs;
+	int		_armed_sub;
+	orb_advert_t	_outputs_pub;
+	actuator_armed_s	_armed;
 	unsigned	_num_outputs;
 	bool		_primary_pwm_device;
 
 	volatile bool	_task_should_exit;
-	bool		_armed;
+	bool		_servo_armed;
 	bool		_pwm_on;
 
 	MixerGroup	*_mixers;
 
-	actuator_controls_s _controls;
+	uint32_t	_groups_required;
+	uint32_t	_groups_subscribed;
+	int		_control_subs[NUM_ACTUATOR_CONTROL_GROUPS];
+	actuator_controls_s _controls[NUM_ACTUATOR_CONTROL_GROUPS];
+	orb_id_t	_control_topics[NUM_ACTUATOR_CONTROL_GROUPS];
+	pollfd	_poll_fds[NUM_ACTUATOR_CONTROL_GROUPS];
+	unsigned	_poll_fds_num;
 
 	pwm_limit_t	_pwm_limit;
 	uint16_t	_failsafe_pwm[_max_actuators];
@@ -143,13 +153,13 @@ private:
 	unsigned	_num_disarmed_set;
 
 	static void	task_main_trampoline(int argc, char *argv[]);
-	void		task_main() __attribute__((noreturn));
+	void		task_main();
 
 	static int	control_callback(uintptr_t handle,
 					 uint8_t control_group,
 					 uint8_t control_index,
 					 float &input);
-
+	void	subscribe();
 	int		set_pwm_rate(unsigned rate_map, unsigned default_rate, unsigned alt_rate);
 	int		pwm_ioctl(file *filp, int cmd, unsigned long arg);
 
@@ -197,6 +207,20 @@ const PX4FMU::GPIOConfig PX4FMU::_gpio_tab[] = {
 	{GPIO_VDD_5V_HIPOWER_OC, 0,                       0},
 	{GPIO_VDD_5V_PERIPH_OC,  0,                       0},
 #endif
+#if defined(CONFIG_ARCH_BOARD_AEROCORE)
+	/* AeroCore breaks out User GPIOs on J11 */
+	{GPIO_GPIO0_INPUT,       GPIO_GPIO0_OUTPUT,       0},
+	{GPIO_GPIO1_INPUT,       GPIO_GPIO1_OUTPUT,       0},
+	{GPIO_GPIO3_INPUT,       GPIO_GPIO3_OUTPUT,       0},
+	{GPIO_GPIO4_INPUT,       GPIO_GPIO4_OUTPUT,       0},
+	{GPIO_GPIO5_INPUT,       GPIO_GPIO5_OUTPUT,       0},
+	{GPIO_GPIO6_INPUT,       GPIO_GPIO6_OUTPUT,       0},
+	{GPIO_GPIO7_INPUT,       GPIO_GPIO7_OUTPUT,       0},
+	{GPIO_GPIO8_INPUT,       GPIO_GPIO8_OUTPUT,       0},
+	{GPIO_GPIO9_INPUT,       GPIO_GPIO9_OUTPUT,       0},
+	{GPIO_GPIO10_INPUT,      GPIO_GPIO10_OUTPUT,      0},
+	{GPIO_GPIO11_INPUT,      GPIO_GPIO11_OUTPUT,      0},
+#endif
 };
 
 const unsigned PX4FMU::_ngpio = sizeof(PX4FMU::_gpio_tab) / sizeof(PX4FMU::_gpio_tab[0]);
@@ -216,25 +240,36 @@ PX4FMU::PX4FMU() :
 	_pwm_alt_rate_channels(0),
 	_current_update_rate(0),
 	_task(-1),
-	_t_actuators(-1),
-	_t_actuator_armed(-1),
-	_t_outputs(0),
+	_armed_sub(-1),
+	_outputs_pub(-1),
 	_num_outputs(0),
 	_primary_pwm_device(false),
 	_task_should_exit(false),
-	_armed(false),
+	_servo_armed(false),
 	_pwm_on(false),
 	_mixers(nullptr),
-	_failsafe_pwm({0}),
-	      _disarmed_pwm({0}),
-	      _num_failsafe_set(0),
-	      _num_disarmed_set(0)
+	_groups_required(0),
+	_groups_subscribed(0),
+	_control_subs{-1},
+	_poll_fds_num(0),
+	_failsafe_pwm{0},
+	_disarmed_pwm{0},
+	_num_failsafe_set(0),
+	_num_disarmed_set(0)
 {
 	for (unsigned i = 0; i < _max_actuators; i++) {
 		_min_pwm[i] = PWM_DEFAULT_MIN;
 		_max_pwm[i] = PWM_DEFAULT_MAX;
 	}
 
+	_control_topics[0] = ORB_ID(actuator_controls_0);
+	_control_topics[1] = ORB_ID(actuator_controls_1);
+	_control_topics[2] = ORB_ID(actuator_controls_2);
+	_control_topics[3] = ORB_ID(actuator_controls_3);
+
+	memset(_controls, 0, sizeof(_controls));
+	memset(_poll_fds, 0, sizeof(_poll_fds));
+
 	_debug_enabled = true;
 }
 
@@ -365,6 +400,20 @@ PX4FMU::set_mode(Mode mode)
 
 		break;
 
+#ifdef CONFIG_ARCH_BOARD_AEROCORE
+	case MODE_8PWM: // AeroCore PWMs as 8 PWM outs
+		debug("MODE_8PWM");
+		/* default output rates */
+		_pwm_default_rate = 50;
+		_pwm_alt_rate = 50;
+		_pwm_alt_rate_channels = 0;
+
+		/* XXX magic numbers */
+		up_pwm_servo_init(0xff);
+		set_pwm_rate(_pwm_alt_rate_channels, _pwm_default_rate, _pwm_alt_rate);
+		break;
+#endif
+
 	case MODE_NONE:
 		debug("MODE_NONE");
 
@@ -448,32 +497,42 @@ PX4FMU::set_pwm_alt_channels(uint32_t channels)
 }
 
 void
+PX4FMU::subscribe()
+{
+	/* subscribe/unsubscribe to required actuator control groups */
+	uint32_t sub_groups = _groups_required & ~_groups_subscribed;
+	uint32_t unsub_groups = _groups_subscribed & ~_groups_required;
+	_poll_fds_num = 0;
+	for (unsigned i = 0; i < NUM_ACTUATOR_CONTROL_GROUPS; i++) {
+		if (sub_groups & (1 << i)) {
+			warnx("subscribe to actuator_controls_%d", i);
+			_control_subs[i] = orb_subscribe(_control_topics[i]);
+		}
+		if (unsub_groups & (1 << i)) {
+			warnx("unsubscribe from actuator_controls_%d", i);
+			::close(_control_subs[i]);
+			_control_subs[i] = -1;
+		}
+
+		if (_control_subs[i] > 0) {
+			_poll_fds[_poll_fds_num].fd = _control_subs[i];
+			_poll_fds[_poll_fds_num].events = POLLIN;
+			_poll_fds_num++;
+		}
+	}
+}
+
+void
 PX4FMU::task_main()
 {
-	/*
-	 * Subscribe to the appropriate PWM output topic based on whether we are the
-	 * primary PWM output or not.
-	 */
-	_t_actuators = orb_subscribe(_primary_pwm_device ? ORB_ID_VEHICLE_ATTITUDE_CONTROLS :
-				     ORB_ID(actuator_controls_1));
 	/* force a reset of the update rate */
 	_current_update_rate = 0;
 
-	_t_actuator_armed = orb_subscribe(ORB_ID(actuator_armed));
-	orb_set_interval(_t_actuator_armed, 200);		/* 5Hz update rate */
+	_armed_sub = orb_subscribe(ORB_ID(actuator_armed));
 
 	/* advertise the mixed control outputs */
 	actuator_outputs_s outputs;
 	memset(&outputs, 0, sizeof(outputs));
-	/* advertise the mixed control outputs */
-	_t_outputs = orb_advertise(_primary_pwm_device ? ORB_ID_VEHICLE_CONTROLS : ORB_ID(actuator_outputs_1),
-				   &outputs);
-
-	pollfd fds[2];
-	fds[0].fd = _t_actuators;
-	fds[0].events = POLLIN;
-	fds[1].fd = _t_actuator_armed;
-	fds[1].events = POLLIN;
 
 #ifdef HRT_PPM_CHANNEL
 	// rc input, published to ORB
@@ -491,6 +550,12 @@ PX4FMU::task_main()
 
 	/* loop until killed */
 	while (!_task_should_exit) {
+		if (_groups_subscribed != _groups_required) {
+			subscribe();
+			_groups_subscribed = _groups_required;
+			/* force setting update rate */
+			_current_update_rate = 0;
+		}
 
 		/*
 		 * Adjust actuator topic update rate to keep up with
@@ -515,20 +580,23 @@ PX4FMU::task_main()
 			}
 
 			debug("adjusted actuator update interval to %ums", update_rate_in_ms);
-			orb_set_interval(_t_actuators, update_rate_in_ms);
+			for (unsigned i = 0; i < NUM_ACTUATOR_CONTROL_GROUPS; i++) {
+				if (_control_subs[i] > 0) {
+					orb_set_interval(_control_subs[i], update_rate_in_ms);
+				}
+			}
 
 			// set to current max rate, even if we are actually checking slower/faster
 			_current_update_rate = max_rate;
 		}
 
 		/* sleep waiting for data, stopping to check for PPM
-		 * input at 100Hz */
-		int ret = ::poll(&fds[0], 2, CONTROL_INPUT_DROP_LIMIT_MS);
+		 * input at 50Hz */
+		int ret = ::poll(_poll_fds, _poll_fds_num, CONTROL_INPUT_DROP_LIMIT_MS);
 
 		/* this would be bad... */
 		if (ret < 0) {
 			log("poll error %d", errno);
-			usleep(1000000);
 			continue;
 
 		} else if (ret == 0) {
@@ -537,89 +605,100 @@ PX4FMU::task_main()
 
 		} else {
 
-			/* do we have a control update? */
-			if (fds[0].revents & POLLIN) {
+			/* get controls for required topics */
+			unsigned poll_id = 0;
+			for (unsigned i = 0; i < NUM_ACTUATOR_CONTROL_GROUPS; i++) {
+				if (_control_subs[i] > 0) {
+					if (_poll_fds[poll_id].revents & POLLIN) {
+						orb_copy(_control_topics[i], _control_subs[i], &_controls[i]);
+					}
+					poll_id++;
+				}
+			}
 
-				/* get controls - must always do this to avoid spinning */
-				orb_copy(_primary_pwm_device ? ORB_ID_VEHICLE_ATTITUDE_CONTROLS : ORB_ID(actuator_controls_1), _t_actuators, &_controls);
+			/* can we mix? */
+			if (_mixers != nullptr) {
 
-				/* can we mix? */
-				if (_mixers != nullptr) {
+				unsigned num_outputs;
 
-					unsigned num_outputs;
+				switch (_mode) {
+				case MODE_2PWM:
+					num_outputs = 2;
+					break;
 
-					switch (_mode) {
-					case MODE_2PWM:
-						num_outputs = 2;
-						break;
+				case MODE_4PWM:
+					num_outputs = 4;
+					break;
 
-					case MODE_4PWM:
-						num_outputs = 4;
-						break;
+				case MODE_6PWM:
+					num_outputs = 6;
+					break;
 
-					case MODE_6PWM:
-						num_outputs = 6;
-						break;
+				case MODE_8PWM:
+					num_outputs = 8;
+					break;
+				default:
+					num_outputs = 0;
+					break;
+				}
 
-					default:
-						num_outputs = 0;
-						break;
+				/* do mixing */
+				outputs.noutputs = _mixers->mix(&outputs.output[0], num_outputs);
+				outputs.timestamp = hrt_absolute_time();
+
+				/* iterate actuators */
+				for (unsigned i = 0; i < num_outputs; i++) {
+					/* last resort: catch NaN and INF */
+					if ((i >= outputs.noutputs) ||
+						!isfinite(outputs.output[i])) {
+						/*
+						 * Value is NaN, INF or out of band - set to the minimum value.
+						 * This will be clearly visible on the servo status and will limit the risk of accidentally
+						 * spinning motors. It would be deadly in flight.
+						 */
+						outputs.output[i] = -1.0f;
 					}
+				}
 
-					/* do mixing */
-					outputs.noutputs = _mixers->mix(&outputs.output[0], num_outputs);
-					outputs.timestamp = hrt_absolute_time();
-
-					/* iterate actuators */
-					for (unsigned i = 0; i < num_outputs; i++) {
-						/* last resort: catch NaN, INF and out-of-band errors */
-						if (i >= outputs.noutputs ||
-						    !isfinite(outputs.output[i]) ||
-						    outputs.output[i] < -1.0f ||
-						    outputs.output[i] > 1.0f) {
-							/*
-							 * Value is NaN, INF or out of band - set to the minimum value.
-							 * This will be clearly visible on the servo status and will limit the risk of accidentally
-							 * spinning motors. It would be deadly in flight.
-							 */
-							outputs.output[i] = -1.0f;
-						}
-					}
+				uint16_t pwm_limited[num_outputs];
 
-					uint16_t pwm_limited[num_outputs];
+				/* the PWM limit call takes care of out of band errors and constrains */
+				pwm_limit_calc(_servo_armed, num_outputs, _disarmed_pwm, _min_pwm, _max_pwm, outputs.output, pwm_limited, &_pwm_limit);
 
-					pwm_limit_calc(_armed, num_outputs, _disarmed_pwm, _min_pwm, _max_pwm, outputs.output, pwm_limited, &_pwm_limit);
+				/* output to the servos */
+				for (unsigned i = 0; i < num_outputs; i++) {
+					up_pwm_servo_set(i, pwm_limited[i]);
+				}
 
-					/* output to the servos */
-					for (unsigned i = 0; i < num_outputs; i++) {
-						up_pwm_servo_set(i, pwm_limited[i]);
-					}
+				/* publish mixed control outputs */
+				if (_outputs_pub < 0) {
+					_outputs_pub = orb_advertise(_primary_pwm_device ? ORB_ID_VEHICLE_CONTROLS : ORB_ID(actuator_outputs_1), &outputs);
+				} else {
 
-					/* and publish for anyone that cares to see */
-					orb_publish(_primary_pwm_device ? ORB_ID_VEHICLE_CONTROLS : ORB_ID(actuator_outputs_1), _t_outputs, &outputs);
+					orb_publish(_primary_pwm_device ? ORB_ID_VEHICLE_CONTROLS : ORB_ID(actuator_outputs_1), _outputs_pub, &outputs);
 				}
 			}
+		}
 
-			/* how about an arming update? */
-			if (fds[1].revents & POLLIN) {
-				actuator_armed_s aa;
+		/* check arming state */
+		bool updated = false;
+		orb_check(_armed_sub, &updated);
 
-				/* get new value */
-				orb_copy(ORB_ID(actuator_armed), _t_actuator_armed, &aa);
+		if (updated) {
+			orb_copy(ORB_ID(actuator_armed), _armed_sub, &_armed);
 
-				/* update the armed status and check that we're not locked down */
-				bool set_armed = aa.armed && !aa.lockdown;
+			/* update the armed status and check that we're not locked down */
+			bool set_armed = _armed.armed && !_armed.lockdown;
 
-				if (_armed != set_armed)
-					_armed = set_armed;
+			if (_servo_armed != set_armed)
+				_servo_armed = set_armed;
 
-				/* update PWM status if armed or if disarmed PWM values are set */
-				bool pwm_on = (aa.armed || _num_disarmed_set > 0);
+			/* update PWM status if armed or if disarmed PWM values are set */
+			bool pwm_on = (_armed.armed || _num_disarmed_set > 0);
 
-				if (_pwm_on != pwm_on) {
-					_pwm_on = pwm_on;
-					up_pwm_servo_arm(pwm_on);
-				}
+			if (_pwm_on != pwm_on) {
+				_pwm_on = pwm_on;
+				up_pwm_servo_arm(pwm_on);
 			}
 		}
 
@@ -661,8 +740,13 @@ PX4FMU::task_main()
 
 	}
 
-	::close(_t_actuators);
-	::close(_t_actuator_armed);
+	for (unsigned i = 0; i < NUM_ACTUATOR_CONTROL_GROUPS; i++) {
+		if (_control_subs[i] > 0) {
+			::close(_control_subs[i]);
+			_control_subs[i] = -1;
+		}
+	}
+	::close(_armed_sub);
 
 	/* make sure servos are off */
 	up_pwm_servo_deinit();
@@ -684,7 +768,7 @@ PX4FMU::control_callback(uintptr_t handle,
 {
 	const actuator_controls_s *controls = (actuator_controls_s *)handle;
 
-	input = controls->control[control_index];
+	input = controls[control_group].control[control_index];
 	return 0;
 }
 
@@ -707,6 +791,9 @@ PX4FMU::ioctl(file *filp, int cmd, unsigned long arg)
 	case MODE_2PWM:
 	case MODE_4PWM:
 	case MODE_6PWM:
+#ifdef CONFIG_ARCH_BOARD_AEROCORE
+	case MODE_8PWM:
+#endif
 		ret = pwm_ioctl(filp, cmd, arg);
 		break;
 
@@ -736,6 +823,7 @@ PX4FMU::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 
 	case PWM_SERVO_SET_ARM_OK:
 	case PWM_SERVO_CLEAR_ARM_OK:
+	case PWM_SERVO_SET_FORCE_SAFETY_OFF:
 		// these are no-ops, as no safety switch
 		break;
 
@@ -935,6 +1023,15 @@ PX4FMU::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 			break;
 		}
 
+#ifdef CONFIG_ARCH_BOARD_AEROCORE
+	case PWM_SERVO_SET(7):
+	case PWM_SERVO_SET(6):
+		if (_mode < MODE_8PWM) {
+			ret = -EINVAL;
+			break;
+		}
+#endif
+
 	case PWM_SERVO_SET(5):
 	case PWM_SERVO_SET(4):
 		if (_mode < MODE_6PWM) {
@@ -962,6 +1059,15 @@ PX4FMU::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 
 		break;
 
+#ifdef CONFIG_ARCH_BOARD_AEROCORE
+	case PWM_SERVO_GET(7):
+	case PWM_SERVO_GET(6):
+		if (_mode < MODE_8PWM) {
+			ret = -EINVAL;
+			break;
+		}
+#endif
+
 	case PWM_SERVO_GET(5):
 	case PWM_SERVO_GET(4):
 		if (_mode < MODE_6PWM) {
@@ -989,12 +1095,22 @@ PX4FMU::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 	case PWM_SERVO_GET_RATEGROUP(3):
 	case PWM_SERVO_GET_RATEGROUP(4):
 	case PWM_SERVO_GET_RATEGROUP(5):
+#ifdef CONFIG_ARCH_BOARD_AEROCORE
+	case PWM_SERVO_GET_RATEGROUP(6):
+	case PWM_SERVO_GET_RATEGROUP(7):
+#endif
 		*(uint32_t *)arg = up_pwm_servo_get_rate_group(cmd - PWM_SERVO_GET_RATEGROUP(0));
 		break;
 
 	case PWM_SERVO_GET_COUNT:
 	case MIXERIOCGETOUTPUTCOUNT:
 		switch (_mode) {
+#ifdef CONFIG_ARCH_BOARD_AEROCORE
+		case MODE_8PWM:
+			*(unsigned *)arg = 8;
+			break;
+#endif
+
 		case MODE_6PWM:
 			*(unsigned *)arg = 6;
 			break;
@@ -1040,6 +1156,11 @@ PX4FMU::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 			set_mode(MODE_6PWM);
 			break;
 #endif
+#if defined(CONFIG_ARCH_BOARD_AEROCORE)
+		case 8:
+			set_mode(MODE_8PWM);
+			break;
+#endif
 
 		default:
 			ret = -EINVAL;
@@ -1052,6 +1173,7 @@ PX4FMU::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 		if (_mixers != nullptr) {
 			delete _mixers;
 			_mixers = nullptr;
+			_groups_required = 0;
 		}
 
 		break;
@@ -1060,18 +1182,20 @@ PX4FMU::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 			mixer_simple_s *mixinfo = (mixer_simple_s *)arg;
 
 			SimpleMixer *mixer = new SimpleMixer(control_callback,
-							     (uintptr_t)&_controls, mixinfo);
+							     (uintptr_t)_controls, mixinfo);
 
 			if (mixer->check()) {
 				delete mixer;
+				_groups_required = 0;
 				ret = -EINVAL;
 
 			} else {
 				if (_mixers == nullptr)
 					_mixers = new MixerGroup(control_callback,
-								 (uintptr_t)&_controls);
+								 (uintptr_t)_controls);
 
 				_mixers->add_mixer(mixer);
+				_mixers->groups_required(_groups_required);
 			}
 
 			break;
@@ -1082,9 +1206,10 @@ PX4FMU::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 			unsigned buflen = strnlen(buf, 1024);
 
 			if (_mixers == nullptr)
-				_mixers = new MixerGroup(control_callback, (uintptr_t)&_controls);
+				_mixers = new MixerGroup(control_callback, (uintptr_t)_controls);
 
 			if (_mixers == nullptr) {
+				_groups_required = 0;
 				ret = -ENOMEM;
 
 			} else {
@@ -1095,7 +1220,11 @@ PX4FMU::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 					debug("mixer load failed with %d", ret);
 					delete _mixers;
 					_mixers = nullptr;
+					_groups_required = 0;
 					ret = -EINVAL;
+				} else {
+
+					_mixers->groups_required(_groups_required);
 				}
 			}
 
@@ -1122,10 +1251,17 @@ PX4FMU::write(file *filp, const char *buffer, size_t len)
 	unsigned count = len / 2;
 	uint16_t values[6];
 
+#ifdef CONFIG_ARCH_BOARD_AEROCORE
+	if (count > 8) {
+		// we have at most 8 outputs
+		count = 8;
+	}
+#else
 	if (count > 6) {
 		// we have at most 6 outputs
 		count = 6;
 	}
+#endif
 
 	// allow for misaligned values
 	memcpy(values, buffer, count * 2);
@@ -1400,6 +1536,9 @@ fmu_new_mode(PortMode new_mode)
 #if defined(CONFIG_ARCH_BOARD_PX4FMU_V2)
 		servo_mode = PX4FMU::MODE_6PWM;
 #endif
+#if defined(CONFIG_ARCH_BOARD_AEROCORE)
+		servo_mode = PX4FMU::MODE_8PWM;
+#endif
 		break;
 
 		/* mixed modes supported on v1 board only */
@@ -1717,7 +1856,7 @@ fmu_main(int argc, char *argv[])
 	fprintf(stderr, "FMU: unrecognised command %s, try:\n", verb);
 #if defined(CONFIG_ARCH_BOARD_PX4FMU_V1)
 	fprintf(stderr, "  mode_gpio, mode_serial, mode_pwm, mode_gpio_serial, mode_pwm_serial, mode_pwm_gpio, test\n");
-#elif defined(CONFIG_ARCH_BOARD_PX4FMU_V2)
+#elif defined(CONFIG_ARCH_BOARD_PX4FMU_V2) || defined(CONFIG_ARCH_BOARD_AEROCORE)
 	fprintf(stderr, "  mode_gpio, mode_pwm, test, sensor_reset [milliseconds]\n");
 #endif
 	exit(1);
diff --git a/src/drivers/px4fmu/module.mk b/src/drivers/px4fmu/module.mk
index 05bc7a5b3..eeb59e1a1 100644
--- a/src/drivers/px4fmu/module.mk
+++ b/src/drivers/px4fmu/module.mk
@@ -4,3 +4,5 @@
 
 MODULE_COMMAND	 = fmu
 SRCS		 = fmu.cpp
+
+MODULE_STACKSIZE = 1200
diff --git a/src/drivers/px4io/module.mk b/src/drivers/px4io/module.mk
index 2054faa12..c14f1f783 100644
--- a/src/drivers/px4io/module.mk
+++ b/src/drivers/px4io/module.mk
@@ -44,3 +44,5 @@ SRCS			= px4io.cpp \
 
 # XXX prune to just get UART registers
 INCLUDE_DIRS    += $(NUTTX_SRC)/arch/arm/src/stm32 $(NUTTX_SRC)/arch/arm/src/common
+
+MODULE_STACKSIZE = 1200
diff --git a/src/drivers/px4io/px4io.cpp b/src/drivers/px4io/px4io.cpp
index 82f3ba044..24da4c68b 100644
--- a/src/drivers/px4io/px4io.cpp
+++ b/src/drivers/px4io/px4io.cpp
@@ -72,6 +72,7 @@
 #include <systemlib/systemlib.h>
 #include <systemlib/scheduling_priorities.h>
 #include <systemlib/param/param.h>
+#include <systemlib/circuit_breaker.h>
 
 #include <uORB/topics/actuator_controls.h>
 #include <uORB/topics/actuator_outputs.h>
@@ -91,6 +92,8 @@
 
 #include "uploader.h"
 
+#include "modules/dataman/dataman.h"
+
 extern device::Device *PX4IO_i2c_interface() weak_function;
 extern device::Device *PX4IO_serial_interface() weak_function;
 
@@ -195,8 +198,10 @@ public:
 	 * Print IO status.
 	 *
 	 * Print all relevant IO status information
+	 *
+	 * @param extended_status Shows more verbose information (in particular RC config)
 	 */
-	void			print_status();
+	void			print_status(bool extended_status);
 
 	/**
 	 * Fetch and print debug console output.
@@ -527,6 +532,11 @@ PX4IO::~PX4IO()
 	if (_interface != nullptr)
 		delete _interface;
 
+	/* deallocate perfs */
+	perf_free(_perf_update);
+	perf_free(_perf_write);
+	perf_free(_perf_chan_count);
+
 	g_dev = nullptr;
 }
 
@@ -568,9 +578,17 @@ int
 PX4IO::init()
 {
 	int ret;
+	param_t sys_restart_param;
+	int sys_restart_val = DM_INIT_REASON_VOLATILE;
 
 	ASSERT(_task == -1);
 
+	sys_restart_param = param_find("SYS_RESTART_TYPE");
+	if (sys_restart_param != PARAM_INVALID) {
+		/* Indicate restart type is unknown */
+		param_set(sys_restart_param, &sys_restart_val);
+	}
+
 	/* do regular cdev init */
 	ret = CDev::init();
 
@@ -675,6 +693,25 @@ PX4IO::init()
 
 		/* send command to arm system via command API */
 		vehicle_command_s cmd;
+		/* send this to itself */
+		param_t sys_id_param = param_find("MAV_SYS_ID");
+		param_t comp_id_param = param_find("MAV_COMP_ID");
+
+		int32_t sys_id;
+		int32_t comp_id;
+
+		if (param_get(sys_id_param, &sys_id)) {
+			errx(1, "PRM SYSID");
+		}
+
+		if (param_get(comp_id_param, &comp_id)) {
+			errx(1, "PRM CMPID");
+		}
+
+		cmd.target_system = sys_id;
+		cmd.target_component = comp_id;
+		cmd.source_system = sys_id;
+		cmd.source_component = comp_id;
 		/* request arming */
 		cmd.param1 = 1.0f;
 		cmd.param2 = 0;
@@ -684,10 +721,7 @@ PX4IO::init()
 		cmd.param6 = 0;
 		cmd.param7 = 0;
 		cmd.command = VEHICLE_CMD_COMPONENT_ARM_DISARM;
-		// cmd.target_system = status.system_id;
-		// cmd.target_component = status.component_id;
-		// cmd.source_system = status.system_id;
-		// cmd.source_component = status.component_id;
+
 		/* ask to confirm command */
 		cmd.confirmation =  1;
 
@@ -720,6 +754,11 @@ PX4IO::init()
 			/* keep waiting for state change for 2 s */
 		} while (!safety.armed);
 
+		/* Indicate restart type is in-flight */
+		sys_restart_val = DM_INIT_REASON_IN_FLIGHT;
+		param_set(sys_restart_param, &sys_restart_val);
+
+
 		/* regular boot, no in-air restart, init IO */
 
 	} else {
@@ -745,6 +784,10 @@ PX4IO::init()
 			}
 		}
 
+		/* Indicate restart type is power on */
+		sys_restart_val = DM_INIT_REASON_POWER_ON;
+		param_set(sys_restart_param, &sys_restart_val);
+
 	}
 
 	/* try to claim the generic PWM output device node as well - it's OK if we fail at this */
@@ -756,7 +799,12 @@ PX4IO::init()
 	}
 
 	/* start the IO interface task */
-	_task = task_create("px4io", SCHED_PRIORITY_ACTUATOR_OUTPUTS, 2048, (main_t)&PX4IO::task_main_trampoline, nullptr);
+	_task = task_spawn_cmd("px4io",
+					SCHED_DEFAULT,
+					SCHED_PRIORITY_ACTUATOR_OUTPUTS,
+					2000,
+					(main_t)&PX4IO::task_main_trampoline,
+					nullptr);
 
 	if (_task < 0) {
 		debug("task start failed: %d", errno);
@@ -944,8 +992,40 @@ PX4IO::task_main()
 				int pret = io_reg_set(PX4IO_PAGE_SETUP, PX4IO_P_SETUP_VBATT_SCALE, &scaling, 1);
 
 				if (pret != OK) {
-					log("voltage scaling upload failed");
+					log("vscale upload failed");
+				}
+
+				/* send RC throttle failsafe value to IO */
+				int32_t failsafe_param_val;
+				param_t failsafe_param = param_find("RC_FAILS_THR");
+
+				if (failsafe_param != PARAM_INVALID) {
+
+					param_get(failsafe_param, &failsafe_param_val);
+
+					if (failsafe_param_val > 0) {
+
+						uint16_t failsafe_thr = failsafe_param_val;
+						pret = io_reg_set(PX4IO_PAGE_SETUP, PX4IO_P_SETUP_RC_THR_FAILSAFE_US, &failsafe_thr, 1);
+						if (pret != OK) {
+							log("failsafe upload failed, FS: %d us", (int)failsafe_thr);
+						}
+					}
 				}
+
+				int32_t safety_param_val;
+				param_t safety_param = param_find("RC_FAILS_THR");
+
+				if (safety_param != PARAM_INVALID) {
+
+					param_get(safety_param, &safety_param_val);
+
+					if (safety_param_val == PX4IO_FORCE_SAFETY_MAGIC) {
+						/* disable IO safety if circuit breaker asked for it */
+						(void)io_reg_set(PX4IO_PAGE_SETUP, PX4IO_P_SETUP_FORCE_SAFETY_OFF, safety_param_val);
+					}
+				}
+
 			}
 
 		}
@@ -1400,7 +1480,7 @@ PX4IO::io_get_raw_rc_input(rc_input_values &input_rc)
 	/* we don't have the status bits, so input_source has to be set elsewhere */
 	input_rc.input_source = RC_INPUT_SOURCE_UNKNOWN;
 
-	static const unsigned prolog = (PX4IO_P_RAW_RC_BASE - PX4IO_P_RAW_RC_COUNT);
+	const unsigned prolog = (PX4IO_P_RAW_RC_BASE - PX4IO_P_RAW_RC_COUNT);
 	uint16_t regs[RC_INPUT_MAX_CHANNELS + prolog];
 
 	/*
@@ -1408,8 +1488,6 @@ PX4IO::io_get_raw_rc_input(rc_input_values &input_rc)
 	 *
 	 * This should be the common case (9 channel R/C control being a reasonable upper bound).
 	 */
-	input_rc.timestamp_publication = hrt_absolute_time();
-
 	ret = io_reg_get(PX4IO_PAGE_RAW_RC_INPUT, PX4IO_P_RAW_RC_COUNT, &regs[0], prolog + 9);
 
 	if (ret != OK)
@@ -1421,23 +1499,38 @@ PX4IO::io_get_raw_rc_input(rc_input_values &input_rc)
 	 */
 	channel_count = regs[PX4IO_P_RAW_RC_COUNT];
 
-	if (channel_count != _rc_chan_count)
+	/* limit the channel count */
+	if (channel_count > RC_INPUT_MAX_CHANNELS) {
+		channel_count = RC_INPUT_MAX_CHANNELS;
+	}
+
+	/* count channel count changes to identify signal integrity issues */
+	if (channel_count != _rc_chan_count) {
 		perf_count(_perf_chan_count);
+	}
 
 	_rc_chan_count = channel_count;
 
+	input_rc.timestamp_publication = hrt_absolute_time();
+
 	input_rc.rc_ppm_frame_length = regs[PX4IO_P_RAW_RC_DATA];
 	input_rc.rssi = regs[PX4IO_P_RAW_RC_NRSSI];
 	input_rc.rc_failsafe = (regs[PX4IO_P_RAW_RC_FLAGS] & PX4IO_P_RAW_RC_FLAGS_FAILSAFE);
+	input_rc.rc_lost = !(regs[PX4IO_P_RAW_RC_FLAGS] & PX4IO_P_RAW_RC_FLAGS_RC_OK);
 	input_rc.rc_lost_frame_count = regs[PX4IO_P_RAW_LOST_FRAME_COUNT];
 	input_rc.rc_total_frame_count = regs[PX4IO_P_RAW_FRAME_COUNT];
+	input_rc.channel_count = channel_count;
 
 	/* rc_lost has to be set before the call to this function */
-	if (!input_rc.rc_lost && !input_rc.rc_failsafe)
+	if (!input_rc.rc_lost && !input_rc.rc_failsafe) {
 		_rc_last_valid = input_rc.timestamp_publication;
+	}
 
 	input_rc.timestamp_last_signal = _rc_last_valid;
 
+	/* FIELDS NOT SET HERE */
+	/* input_rc.input_source is set after this call XXX we might want to mirror the flags in the RC struct */
+
 	if (channel_count > 9) {
 		ret = io_reg_get(PX4IO_PAGE_RAW_RC_INPUT, PX4IO_P_RAW_RC_BASE + 9, &regs[prolog + 9], channel_count - 9);
 
@@ -1445,8 +1538,10 @@ PX4IO::io_get_raw_rc_input(rc_input_values &input_rc)
 			return ret;
 	}
 
-	input_rc.channel_count = channel_count;
-	memcpy(input_rc.values, &regs[prolog], channel_count * 2);
+	/* last thing set are the actual channel values as 16 bit values */
+	for (unsigned i = 0; i < channel_count; i++) {
+		input_rc.values[i] = regs[prolog + i];
+	}
 
 	return ret;
 }
@@ -1479,10 +1574,11 @@ PX4IO::io_publish_raw_rc()
 	} else {
 		rc_val.input_source = RC_INPUT_SOURCE_UNKNOWN;
 
-		/* we do not know the RC input, only publish if RC OK flag is set */
-		/* if no raw RC, just don't publish */
-		if (!(_status & PX4IO_P_STATUS_FLAGS_RC_OK))
+		/* only keep publishing RC input if we ever got a valid input */
+		if (_rc_last_valid == 0) {
+			/* we have never seen valid RC signals, abort */
 			return OK;
+		}
 	}
 
 	/* lazily advertise on first publication */
@@ -1770,7 +1866,7 @@ PX4IO::mixer_send(const char *buf, unsigned buflen, unsigned retries)
 }
 
 void
-PX4IO::print_status()
+PX4IO::print_status(bool extended_status)
 {
 	/* basic configuration */
 	printf("protocol %u hardware %u bootloader %u buffer %uB crc 0x%04x%04x\n",
@@ -1933,19 +2029,21 @@ PX4IO::print_status()
 		printf("\n");
 	}
 
-	for (unsigned i = 0; i < _max_rc_input; i++) {
-		unsigned base = PX4IO_P_RC_CONFIG_STRIDE * i;
-		uint16_t options = io_reg_get(PX4IO_PAGE_RC_CONFIG, base + PX4IO_P_RC_CONFIG_OPTIONS);
-		printf("input %u min %u center %u max %u deadzone %u assigned %u options 0x%04x%s%s\n",
-		       i,
-		       io_reg_get(PX4IO_PAGE_RC_CONFIG, base + PX4IO_P_RC_CONFIG_MIN),
-		       io_reg_get(PX4IO_PAGE_RC_CONFIG, base + PX4IO_P_RC_CONFIG_CENTER),
-		       io_reg_get(PX4IO_PAGE_RC_CONFIG, base + PX4IO_P_RC_CONFIG_MAX),
-		       io_reg_get(PX4IO_PAGE_RC_CONFIG, base + PX4IO_P_RC_CONFIG_DEADZONE),
-		       io_reg_get(PX4IO_PAGE_RC_CONFIG, base + PX4IO_P_RC_CONFIG_ASSIGNMENT),
-		       options,
-		       ((options & PX4IO_P_RC_CONFIG_OPTIONS_ENABLED) ? " ENABLED" : ""),
-		       ((options & PX4IO_P_RC_CONFIG_OPTIONS_REVERSE) ? " REVERSED" : ""));
+	if (extended_status) {
+		for (unsigned i = 0; i < _max_rc_input; i++) {
+			unsigned base = PX4IO_P_RC_CONFIG_STRIDE * i;
+			uint16_t options = io_reg_get(PX4IO_PAGE_RC_CONFIG, base + PX4IO_P_RC_CONFIG_OPTIONS);
+			printf("input %u min %u center %u max %u deadzone %u assigned %u options 0x%04x%s%s\n",
+			       i,
+			       io_reg_get(PX4IO_PAGE_RC_CONFIG, base + PX4IO_P_RC_CONFIG_MIN),
+			       io_reg_get(PX4IO_PAGE_RC_CONFIG, base + PX4IO_P_RC_CONFIG_CENTER),
+			       io_reg_get(PX4IO_PAGE_RC_CONFIG, base + PX4IO_P_RC_CONFIG_MAX),
+			       io_reg_get(PX4IO_PAGE_RC_CONFIG, base + PX4IO_P_RC_CONFIG_DEADZONE),
+			       io_reg_get(PX4IO_PAGE_RC_CONFIG, base + PX4IO_P_RC_CONFIG_ASSIGNMENT),
+			       options,
+			       ((options & PX4IO_P_RC_CONFIG_OPTIONS_ENABLED) ? " ENABLED" : ""),
+			       ((options & PX4IO_P_RC_CONFIG_OPTIONS_REVERSE) ? " REVERSED" : ""));
+		}
 	}
 
 	printf("failsafe");
@@ -2113,6 +2211,10 @@ PX4IO::ioctl(file * filep, int cmd, unsigned long arg)
 
 	case PWM_SERVO_GET_DISABLE_LOCKDOWN:
 		*(unsigned *)arg = _lockdown_override;
+
+	case PWM_SERVO_SET_FORCE_SAFETY_OFF:
+		/* force safety swith off */
+		ret = io_reg_set(PX4IO_PAGE_SETUP, PX4IO_P_SETUP_FORCE_SAFETY_OFF, PX4IO_FORCE_SAFETY_MAGIC);
 		break;
 
 	case DSM_BIND_START:
@@ -2769,7 +2871,7 @@ monitor(void)
 		if (g_dev != nullptr) {
 
 			printf("\033[2J\033[H"); /* move cursor home and clear screen */
-			(void)g_dev->print_status();
+			(void)g_dev->print_status(false);
 			(void)g_dev->print_debug();
 			printf("\n\n\n[ Use 'px4io debug <N>' for more output. Hit <enter> three times to exit monitor mode ]\n");
 
@@ -3035,7 +3137,7 @@ px4io_main(int argc, char *argv[])
 	if (!strcmp(argv[1], "status")) {
 
 		printf("[px4io] loaded\n");
-		g_dev->print_status();
+		g_dev->print_status(true);
 
 		exit(0);
 	}
diff --git a/src/drivers/px4io/px4io_serial.cpp b/src/drivers/px4io/px4io_serial.cpp
index 43318ca84..c39494fb0 100644
--- a/src/drivers/px4io/px4io_serial.cpp
+++ b/src/drivers/px4io/px4io_serial.cpp
@@ -639,7 +639,7 @@ PX4IO_serial::_do_interrupt()
 		if (_rx_dma_status == _dma_status_waiting) {
 
 			/* verify that the received packet is complete */
-			unsigned length = sizeof(_dma_buffer) - stm32_dmaresidual(_rx_dma);
+			size_t length = sizeof(_dma_buffer) - stm32_dmaresidual(_rx_dma);
 			if ((length < 1) || (length < PKT_SIZE(_dma_buffer))) {
 				perf_count(_pc_badidle);
 
diff --git a/src/drivers/px4io/px4io_uploader.cpp b/src/drivers/px4io/px4io_uploader.cpp
index dd8abbac5..7b6361a7c 100644
--- a/src/drivers/px4io/px4io_uploader.cpp
+++ b/src/drivers/px4io/px4io_uploader.cpp
@@ -201,9 +201,14 @@ PX4IO_Uploader::upload(const char *filenames[])
 			continue;
 		}
 
-		if (bl_rev <= 2)
+		if (bl_rev <= 2) {
 			ret = verify_rev2(fw_size);
-		else if(bl_rev == 3) {
+		} else if(bl_rev == 3) {
+			ret = verify_rev3(fw_size);
+		} else {
+			/* verify rev 4 and higher still uses the same approach and
+			 * every version *needs* to be verified.
+			 */
 			ret = verify_rev3(fw_size);
 		}
 
@@ -235,9 +240,9 @@ PX4IO_Uploader::upload(const char *filenames[])
 	close(_io_fd);
 	_io_fd = -1;
 
-        // sleep for enough time for the IO chip to boot. This makes
-        // forceupdate more reliably startup IO again after update
-        up_udelay(100*1000);
+	// sleep for enough time for the IO chip to boot. This makes
+	// forceupdate more reliably startup IO again after update
+	up_udelay(100*1000);
 
 	return ret;
 }
diff --git a/src/drivers/roboclaw/RoboClaw.cpp b/src/drivers/roboclaw/RoboClaw.cpp
index dd5e4d3e0..fdaa7f27b 100644
--- a/src/drivers/roboclaw/RoboClaw.cpp
+++ b/src/drivers/roboclaw/RoboClaw.cpp
@@ -182,7 +182,10 @@ float RoboClaw::getMotorPosition(e_motor motor)
 		return _motor1Position;
 	} else if (motor == MOTOR_2) {
 		return _motor2Position;
-	}
+	} else {
+		warnx("Unknown motor value passed to RoboClaw::getMotorPosition");
+		return NAN;
+    }
 }
 
 float RoboClaw::getMotorSpeed(e_motor motor)
@@ -191,7 +194,10 @@ float RoboClaw::getMotorSpeed(e_motor motor)
 		return _motor1Speed;
 	} else if (motor == MOTOR_2) {
 		return _motor2Speed;
-	}
+	} else {
+		warnx("Unknown motor value passed to RoboClaw::getMotorPosition");
+		return NAN;
+    }
 }
 
 int RoboClaw::setMotorSpeed(e_motor motor, float value)
diff --git a/src/drivers/sf0x/sf0x.cpp b/src/drivers/sf0x/sf0x.cpp
index 07163035b..bca1715fa 100644
--- a/src/drivers/sf0x/sf0x.cpp
+++ b/src/drivers/sf0x/sf0x.cpp
@@ -124,6 +124,8 @@ private:
 
 	orb_advert_t			_range_finder_topic;
 
+	unsigned			_consecutive_fail_count;
+
 	perf_counter_t			_sample_perf;
 	perf_counter_t			_comms_errors;
 	perf_counter_t			_buffer_overflows;
@@ -186,6 +188,7 @@ SF0X::SF0X(const char *port) :
 	_linebuf_index(0),
 	_last_read(0),
 	_range_finder_topic(-1),
+	_consecutive_fail_count(0),
 	_sample_perf(perf_alloc(PC_ELAPSED, "sf0x_read")),
 	_comms_errors(perf_alloc(PC_COUNT, "sf0x_comms_errors")),
 	_buffer_overflows(perf_alloc(PC_COUNT, "sf0x_buffer_overflows"))
@@ -251,9 +254,6 @@ SF0X::~SF0X()
 int
 SF0X::init()
 {
-	int ret = ERROR;
-	unsigned i = 0;
-
 	/* do regular cdev init */
 	if (CDev::init() != OK) {
 		goto out;
@@ -591,7 +591,7 @@ SF0X::collect()
 		valid = false;
 
 		/* wipe out partially read content from last cycle(s), check for dot */
-		for (int i = 0; i < (lend - 2); i++) {
+		for (unsigned i = 0; i < (lend - 2); i++) {
 			if (_linebuf[i] == '\n') {
 				char buf[sizeof(_linebuf)];
 				memcpy(buf, &_linebuf[i+1], (lend + 1) - (i + 1));
@@ -616,7 +616,7 @@ SF0X::collect()
 		}
 	}
 
-	debug("val (float): %8.4f, raw: %s, valid: %s\n", si_units, _linebuf, ((valid) ? "OK" : "NO"));
+	debug("val (float): %8.4f, raw: %s, valid: %s\n", (double)si_units, _linebuf, ((valid) ? "OK" : "NO"));
 
 	/* done with this chunk, resetting - even if invalid */
 	_linebuf_index = 0;
@@ -720,12 +720,17 @@ SF0X::cycle()
 		if (OK != collect_ret) {
 
 			/* we know the sensor needs about four seconds to initialize */
-			if (hrt_absolute_time() > 5 * 1000 * 1000LL) {
-				log("collection error");
+			if (hrt_absolute_time() > 5 * 1000 * 1000LL && _consecutive_fail_count < 5) {
+				log("collection error #%u", _consecutive_fail_count);
 			}
+			_consecutive_fail_count++;
+
 			/* restart the measurement state machine */
 			start();
 			return;
+		} else {
+			/* apparently success */
+			_consecutive_fail_count = 0;
 		}
 
 		/* next phase is measurement */
@@ -787,7 +792,7 @@ const int ERROR = -1;
 
 SF0X	*g_dev;
 
-void	start();
+void	start(const char *port);
 void	stop();
 void	test();
 void	reset();
diff --git a/src/drivers/stm32/adc/adc.cpp b/src/drivers/stm32/adc/adc.cpp
index 0b8a275e6..aa0dca60c 100644
--- a/src/drivers/stm32/adc/adc.cpp
+++ b/src/drivers/stm32/adc/adc.cpp
@@ -41,6 +41,7 @@
  */
 
 #include <nuttx/config.h>
+#include <board_config.h>
 #include <drivers/device/device.h>
 
 #include <sys/types.h>
@@ -64,6 +65,8 @@
 #include <systemlib/err.h>
 #include <systemlib/perf_counter.h>
 
+#include <uORB/topics/system_power.h>
+
 /*
  * Register accessors.
  * For now, no reason not to just use ADC1.
@@ -119,6 +122,8 @@ private:
 	unsigned		_channel_count;
 	adc_msg_s		*_samples;		/**< sample buffer */
 
+	orb_advert_t		_to_system_power;
+
 	/** work trampoline */
 	static void		_tick_trampoline(void *arg);
 
@@ -134,13 +139,16 @@ private:
 	 */
 	uint16_t		_sample(unsigned channel);
 
+	// update system_power ORB topic, only on FMUv2
+	void update_system_power(void);
 };
 
 ADC::ADC(uint32_t channels) :
 	CDev("adc", ADC_DEVICE_PATH),
-	_sample_perf(perf_alloc(PC_ELAPSED, "ADC samples")),
+	_sample_perf(perf_alloc(PC_ELAPSED, "adc_samples")),
 	_channel_count(0),
-	_samples(nullptr)
+	_samples(nullptr),
+	_to_system_power(0)
 {
 	_debug_enabled = true;
 
@@ -290,6 +298,43 @@ ADC::_tick()
 	/* scan the channel set and sample each */
 	for (unsigned i = 0; i < _channel_count; i++)
 		_samples[i].am_data = _sample(_samples[i].am_channel);
+	update_system_power();
+}
+
+void
+ADC::update_system_power(void)
+{
+#ifdef CONFIG_ARCH_BOARD_PX4FMU_V2
+	system_power_s system_power;
+	system_power.timestamp = hrt_absolute_time();
+
+	system_power.voltage5V_v = 0;
+	for (unsigned i = 0; i < _channel_count; i++) {
+		if (_samples[i].am_channel == 4) {
+			// it is 2:1 scaled
+			system_power.voltage5V_v = _samples[i].am_data * (6.6f / 4096);
+		}
+	}
+
+	// these are not ADC related, but it is convenient to
+	// publish these to the same topic
+	system_power.usb_connected = stm32_gpioread(GPIO_OTGFS_VBUS);
+
+	// note that the valid pins are active low
+	system_power.brick_valid   = !stm32_gpioread(GPIO_VDD_BRICK_VALID);
+	system_power.servo_valid   = !stm32_gpioread(GPIO_VDD_SERVO_VALID);
+
+	// OC pins are active low
+	system_power.periph_5V_OC  = !stm32_gpioread(GPIO_VDD_5V_PERIPH_OC);
+	system_power.hipower_5V_OC = !stm32_gpioread(GPIO_VDD_5V_HIPOWER_OC);
+
+	/* lazily publish */
+	if (_to_system_power > 0) {
+		orb_publish(ORB_ID(system_power), _to_system_power, &system_power);
+	} else {
+		_to_system_power = orb_advertise(ORB_ID(system_power), &system_power);
+	}
+#endif // CONFIG_ARCH_BOARD_PX4FMU_V2
 }
 
 uint16_t
@@ -374,6 +419,10 @@ adc_main(int argc, char *argv[])
 		g_adc = new ADC((1 << 2) | (1 << 3) | (1 << 4) | 
 			(1 << 10) | (1 << 11) | (1 << 12) | (1 << 13) | (1 << 14) | (1 << 15));
 #endif
+#ifdef CONFIG_ARCH_BOARD_AEROCORE
+		/* XXX this hardcodes the default channel set for AeroCore - should be configurable */
+		g_adc = new ADC((1 << 10) | (1 << 11) | (1 << 12) | (1 << 13));
+#endif
 
 		if (g_adc == nullptr)
 			errx(1, "couldn't allocate the ADC driver");
diff --git a/src/drivers/stm32/drv_hrt.c b/src/drivers/stm32/drv_hrt.c
index b7c9b89a4..281f918d7 100644
--- a/src/drivers/stm32/drv_hrt.c
+++ b/src/drivers/stm32/drv_hrt.c
@@ -94,7 +94,7 @@
 #elif HRT_TIMER == 3
 # define HRT_TIMER_BASE		STM32_TIM3_BASE
 # define HRT_TIMER_POWER_REG	STM32_RCC_APB1ENR
-# define HRT_TIMER_POWER_BIT	RCC_APB2ENR_TIM3EN
+# define HRT_TIMER_POWER_BIT	RCC_APB1ENR_TIM3EN
 # define HRT_TIMER_VECTOR	STM32_IRQ_TIM3
 # define HRT_TIMER_CLOCK	STM32_APB1_TIM3_CLKIN
 # if CONFIG_STM32_TIM3
@@ -141,7 +141,7 @@
 # define HRT_TIMER_POWER_REG	STM32_RCC_APB1ENR
 # define HRT_TIMER_POWER_BIT	RCC_APB2ENR_TIM10EN
 # define HRT_TIMER_VECTOR	STM32_IRQ_TIM1UP
-# define HRT_TIMER_CLOCK	STM32_APB1_TIM10_CLKIN
+# define HRT_TIMER_CLOCK	STM32_APB2_TIM10_CLKIN
 # if CONFIG_STM32_TIM10
 #  error must not set CONFIG_STM32_TIM11=y and HRT_TIMER=10
 # endif
@@ -150,7 +150,7 @@
 # define HRT_TIMER_POWER_REG	STM32_RCC_APB1ENR
 # define HRT_TIMER_POWER_BIT	RCC_APB2ENR_TIM11EN
 # define HRT_TIMER_VECTOR	STM32_IRQ_TIM1TRGCOM
-# define HRT_TIMER_CLOCK	STM32_APB1_TIM11_CLKIN
+# define HRT_TIMER_CLOCK	STM32_APB2_TIM11_CLKIN
 # if CONFIG_STM32_TIM11
 #  error must not set CONFIG_STM32_TIM11=y and HRT_TIMER=11
 # endif
@@ -354,6 +354,9 @@ __EXPORT uint16_t ppm_frame_length = 0;
 __EXPORT unsigned ppm_decoded_channels = 0;
 __EXPORT uint64_t ppm_last_valid_decode = 0;
 
+#define PPM_DEBUG 0
+
+#if PPM_DEBUG
 /* PPM edge history */
 __EXPORT uint16_t ppm_edge_history[32];
 unsigned ppm_edge_next;
@@ -361,6 +364,7 @@ unsigned ppm_edge_next;
 /* PPM pulse history */
 __EXPORT uint16_t ppm_pulse_history[32];
 unsigned ppm_pulse_next;
+#endif
 
 static uint16_t ppm_temp_buffer[PPM_MAX_CHANNELS];
 
@@ -455,10 +459,12 @@ hrt_ppm_decode(uint32_t status)
 	/* how long since the last edge? - this handles counter wrapping implicitely. */
 	width = count - ppm.last_edge;
 
+#if PPM_DEBUG
 	ppm_edge_history[ppm_edge_next++] = width;
 
 	if (ppm_edge_next >= 32)
 		ppm_edge_next = 0;
+#endif
 
 	/*
 	 * if this looks like a start pulse, then push the last set of values
@@ -546,10 +552,12 @@ hrt_ppm_decode(uint32_t status)
 		interval = count - ppm.last_mark;
 		ppm.last_mark = count;
 
+#if PPM_DEBUG
 		ppm_pulse_history[ppm_pulse_next++] = interval;
 
 		if (ppm_pulse_next >= 32)
 			ppm_pulse_next = 0;
+#endif
 
 		/* if the mark-mark timing is out of bounds, abandon the frame */
 		if ((interval < PPM_MIN_CHANNEL_VALUE) || (interval > PPM_MAX_CHANNEL_VALUE))
diff --git a/src/drivers/stm32/tone_alarm/tone_alarm.cpp b/src/drivers/stm32/tone_alarm/tone_alarm.cpp
index f36f2091e..810f4aacc 100644
--- a/src/drivers/stm32/tone_alarm/tone_alarm.cpp
+++ b/src/drivers/stm32/tone_alarm/tone_alarm.cpp
@@ -334,6 +334,8 @@ ToneAlarm::ToneAlarm() :
 	_default_tunes[TONE_BATTERY_WARNING_SLOW_TUNE] = "MBNT100a8";					//battery warning slow
 	_default_tunes[TONE_BATTERY_WARNING_FAST_TUNE] = "MBNT255a8a8a8a8a8a8a8a8a8a8a8a8a8a8a8a8";	//battery warning fast
 	_default_tunes[TONE_GPS_WARNING_TUNE] = "MFT255L4AAAL1F#";					//gps warning slow
+	_default_tunes[TONE_ARMING_FAILURE_TUNE] = "MFT255L4<<<BAP";
+	_default_tunes[TONE_PARACHUTE_RELEASE_TUNE] = "MFT255L16agagagag";			// parachute release
 
 	_tune_names[TONE_STARTUP_TUNE] = "startup";			// startup tune
 	_tune_names[TONE_ERROR_TUNE] = "error";				// ERROR tone
@@ -344,6 +346,8 @@ ToneAlarm::ToneAlarm() :
 	_tune_names[TONE_BATTERY_WARNING_SLOW_TUNE] = "slow_bat";	// battery warning slow
 	_tune_names[TONE_BATTERY_WARNING_FAST_TUNE] = "fast_bat";	// battery warning fast
 	_tune_names[TONE_GPS_WARNING_TUNE] = "gps_warning";	            // gps warning
+	_tune_names[TONE_ARMING_FAILURE_TUNE] = "arming_failure";            //fail to arm
+	_tune_names[TONE_PARACHUTE_RELEASE_TUNE] = "parachute_release";	// parachute release
 }
 
 ToneAlarm::~ToneAlarm()
diff --git a/src/examples/fixedwing_control/module.mk b/src/examples/fixedwing_control/module.mk
index d2c48934f..a2a9eb113 100644
--- a/src/examples/fixedwing_control/module.mk
+++ b/src/examples/fixedwing_control/module.mk
@@ -39,3 +39,5 @@ MODULE_COMMAND	= ex_fixedwing_control
 
 SRCS		= main.c \
 		  params.c
+
+MODULE_STACKSIZE = 1200
diff --git a/src/examples/flow_position_control/flow_position_control_main.c b/src/examples/flow_position_control/flow_position_control_main.c
deleted file mode 100644
index 391e40ac1..000000000
--- a/src/examples/flow_position_control/flow_position_control_main.c
+++ /dev/null
@@ -1,613 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (C) 2008-2013 PX4 Development Team. All rights reserved.
- *   Author: Samuel Zihlmann <samuezih@ee.ethz.ch>
- *   		 Lorenz Meier <lm@inf.ethz.ch>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/**
- * @file flow_position_control.c
- *
- * Optical flow position controller
- */
-
-#include <nuttx/config.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdbool.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <debug.h>
-#include <termios.h>
-#include <time.h>
-#include <math.h>
-#include <sys/prctl.h>
-#include <drivers/drv_hrt.h>
-#include <uORB/uORB.h>
-#include <uORB/topics/parameter_update.h>
-#include <uORB/topics/actuator_armed.h>
-#include <uORB/topics/vehicle_control_mode.h>
-#include <uORB/topics/vehicle_attitude.h>
-#include <uORB/topics/manual_control_setpoint.h>
-#include <uORB/topics/vehicle_local_position.h>
-#include <uORB/topics/vehicle_bodyframe_speed_setpoint.h>
-#include <uORB/topics/filtered_bottom_flow.h>
-#include <systemlib/systemlib.h>
-#include <systemlib/perf_counter.h>
-#include <systemlib/err.h>
-#include <poll.h>
-#include <mavlink/mavlink_log.h>
-
-#include "flow_position_control_params.h"
-
-
-static bool thread_should_exit = false;		/**< Deamon exit flag */
-static bool thread_running = false;		/**< Deamon status flag */
-static int deamon_task;				/**< Handle of deamon task / thread */
-
-__EXPORT int flow_position_control_main(int argc, char *argv[]);
-
-/**
- * Mainloop of position controller.
- */
-static int flow_position_control_thread_main(int argc, char *argv[]);
-
-/**
- * Print the correct usage.
- */
-static void usage(const char *reason);
-
-static void
-usage(const char *reason)
-{
-	if (reason)
-		fprintf(stderr, "%s\n", reason);
-	fprintf(stderr, "usage: deamon {start|stop|status} [-p <additional params>]\n\n");
-	exit(1);
-}
-
-/**
- * The deamon app only briefly exists to start
- * the background job. The stack size assigned in the
- * Makefile does only apply to this management task.
- * 
- * The actual stack size should be set in the call
- * to task_spawn_cmd().
- */
-int flow_position_control_main(int argc, char *argv[])
-{
-	if (argc < 1)
-		usage("missing command");
-
-	if (!strcmp(argv[1], "start"))
-	{
-		if (thread_running)
-		{
-			printf("flow position control already running\n");
-			/* this is not an error */
-			exit(0);
-		}
-
-		thread_should_exit = false;
-		deamon_task = task_spawn_cmd("flow_position_control",
-					 SCHED_DEFAULT,
-					 SCHED_PRIORITY_MAX - 6,
-					 4096,
-					 flow_position_control_thread_main,
-					 (argv) ? (const char **)&argv[2] : (const char **)NULL);
-		exit(0);
-	}
-
-	if (!strcmp(argv[1], "stop"))
-	{
-		thread_should_exit = true;
-		exit(0);
-	}
-
-	if (!strcmp(argv[1], "status"))
-	{
-		if (thread_running)
-			printf("\tflow position control app is running\n");
-		else
-			printf("\tflow position control app not started\n");
-
-		exit(0);
-	}
-
-	usage("unrecognized command");
-	exit(1);
-}
-
-static int
-flow_position_control_thread_main(int argc, char *argv[])
-{
-	/* welcome user */
-	thread_running = true;
-	static int mavlink_fd;
-	mavlink_fd = open(MAVLINK_LOG_DEVICE, 0);
-	mavlink_log_info(mavlink_fd, "[fpc] started");
-
-	uint32_t counter = 0;
-	const float time_scale = powf(10.0f,-6.0f);
-
-	/* structures */
-	struct actuator_armed_s armed;
-	memset(&armed, 0, sizeof(armed));
-	struct vehicle_control_mode_s control_mode;
-	memset(&control_mode, 0, sizeof(control_mode));
-	struct vehicle_attitude_s att;
-	memset(&att, 0, sizeof(att));
-	struct manual_control_setpoint_s manual;
-	memset(&manual, 0, sizeof(manual));
-	struct filtered_bottom_flow_s filtered_flow;
-	memset(&filtered_flow, 0, sizeof(filtered_flow));
-	struct vehicle_local_position_s local_pos;
-	memset(&local_pos, 0, sizeof(local_pos));
-	struct vehicle_bodyframe_speed_setpoint_s speed_sp;
-	memset(&speed_sp, 0, sizeof(speed_sp));
-
-	/* subscribe to attitude, motor setpoints and system state */
-	int parameter_update_sub = orb_subscribe(ORB_ID(parameter_update));
-	int vehicle_attitude_sub = orb_subscribe(ORB_ID(vehicle_attitude));
-	int armed_sub = orb_subscribe(ORB_ID(actuator_armed));
-	int control_mode_sub = orb_subscribe(ORB_ID(vehicle_control_mode));
-	int manual_control_setpoint_sub = orb_subscribe(ORB_ID(manual_control_setpoint));
-	int filtered_bottom_flow_sub = orb_subscribe(ORB_ID(filtered_bottom_flow));
-	int vehicle_local_position_sub = orb_subscribe(ORB_ID(vehicle_local_position));
-
-	orb_advert_t speed_sp_pub;
-	bool speed_setpoint_adverted = false;
-
-	/* parameters init*/
-	struct flow_position_control_params params;
-	struct flow_position_control_param_handles param_handles;
-	parameters_init(&param_handles);
-	parameters_update(&param_handles, &params);
-
-	/* init flow sum setpoint */
-	float flow_sp_sumx = 0.0f;
-	float flow_sp_sumy = 0.0f;
-
-	/* init yaw setpoint */
-	float yaw_sp = 0.0f;
-
-	/* init height setpoint */
-	float height_sp = params.height_min;
-
-	/* height controller states */
-	bool start_phase = true;
-	bool landing_initialized = false;
-	float landing_thrust_start = 0.0f;
-
-	/* states */
-	float integrated_h_error = 0.0f;
-	float last_local_pos_z = 0.0f;
-	bool update_flow_sp_sumx = false;
-	bool update_flow_sp_sumy = false;
-	uint64_t last_time = 0.0f;
-	float dt = 0.0f; // s
-
-
-	/* register the perf counter */
-	perf_counter_t mc_loop_perf = perf_alloc(PC_ELAPSED, "flow_position_control_runtime");
-	perf_counter_t mc_interval_perf = perf_alloc(PC_INTERVAL, "flow_position_control_interval");
-	perf_counter_t mc_err_perf = perf_alloc(PC_COUNT, "flow_position_control_err");
-
-	static bool sensors_ready = false;
-	static bool status_changed = false;
-
-	while (!thread_should_exit)
-	{
-		/* wait for first attitude msg to be sure all data are available */
-		if (sensors_ready)
-		{
-			/* polling */
-			struct pollfd fds[2] = {
-				{ .fd = filtered_bottom_flow_sub, .events = POLLIN }, // positions from estimator
-				{ .fd = parameter_update_sub,   .events = POLLIN }
-
-			};
-
-			/* wait for a position update, check for exit condition every 500 ms */
-			int ret = poll(fds, 2, 500);
-
-			if (ret < 0)
-			{
-				/* poll error, count it in perf */
-				perf_count(mc_err_perf);
-			}
-			else if (ret == 0)
-			{
-				/* no return value, ignore */
-//				printf("[flow position control] no filtered flow updates\n");
-			}
-			else
-			{
-				/* parameter update available? */
-				if (fds[1].revents & POLLIN)
-				{
-					/* read from param to clear updated flag */
-					struct parameter_update_s update;
-					orb_copy(ORB_ID(parameter_update), parameter_update_sub, &update);
-
-					parameters_update(&param_handles, &params);
-					mavlink_log_info(mavlink_fd,"[fpc] parameters updated.");
-				}
-
-				/* only run controller if position/speed changed */
-				if (fds[0].revents & POLLIN)
-				{
-					perf_begin(mc_loop_perf);
-
-					/* get a local copy of the vehicle state */
-					orb_copy(ORB_ID(actuator_armed), armed_sub, &armed);
-					/* get a local copy of manual setpoint */
-					orb_copy(ORB_ID(manual_control_setpoint), manual_control_setpoint_sub, &manual);
-					/* get a local copy of attitude */
-					orb_copy(ORB_ID(vehicle_attitude), vehicle_attitude_sub, &att);
-					/* get a local copy of filtered bottom flow */
-					orb_copy(ORB_ID(filtered_bottom_flow), filtered_bottom_flow_sub, &filtered_flow);
-					/* get a local copy of local position */
-					orb_copy(ORB_ID(vehicle_local_position), vehicle_local_position_sub, &local_pos);
-					/* get a local copy of control mode */
-					orb_copy(ORB_ID(vehicle_control_mode), control_mode_sub, &control_mode);
-
-					if (control_mode.flag_control_velocity_enabled)
-					{
-						float manual_pitch = manual.pitch / params.rc_scale_pitch; // 0 to 1
-						float manual_roll = manual.roll / params.rc_scale_roll; // 0 to 1
-						float manual_yaw = manual.yaw / params.rc_scale_yaw; // -1 to 1
-
-						if(status_changed == false)
-							mavlink_log_info(mavlink_fd,"[fpc] flow POSITION control engaged");
-
-						status_changed = true;
-
-						/* calc dt */
-						if(last_time == 0)
-						{
-							last_time = hrt_absolute_time();
-							continue;
-						}
-						dt = ((float) (hrt_absolute_time() - last_time)) * time_scale;
-						last_time = hrt_absolute_time();
-
-						/* update flow sum setpoint */
-						if (update_flow_sp_sumx)
-						{
-							flow_sp_sumx = filtered_flow.sumx;
-							update_flow_sp_sumx = false;
-						}
-						if (update_flow_sp_sumy)
-						{
-							flow_sp_sumy = filtered_flow.sumy;
-							update_flow_sp_sumy = false;
-						} 
-
-						/* calc new bodyframe speed setpoints */
-						float speed_body_x = (flow_sp_sumx - filtered_flow.sumx) * params.pos_p - filtered_flow.vx * params.pos_d;
-						float speed_body_y = (flow_sp_sumy - filtered_flow.sumy) * params.pos_p - filtered_flow.vy * params.pos_d;
-						float speed_limit_height_factor = height_sp; // the settings are for 1 meter
-
-						/* overwrite with rc input if there is any */
-						if(isfinite(manual_pitch) && isfinite(manual_roll))
-						{
-							if(fabsf(manual_pitch) > params.manual_threshold)
-							{
-								speed_body_x = -manual_pitch * params.limit_speed_x * speed_limit_height_factor;
-								update_flow_sp_sumx = true;
-							}
-
-							if(fabsf(manual_roll) > params.manual_threshold)
-							{
-								speed_body_y = manual_roll * params.limit_speed_y * speed_limit_height_factor;
-								update_flow_sp_sumy = true;
-							}
-						}
-
-						/* limit speed setpoints */
-						if((speed_body_x <= params.limit_speed_x * speed_limit_height_factor) &&
-								(speed_body_x >= -params.limit_speed_x * speed_limit_height_factor))
-						{
-							speed_sp.vx = speed_body_x;
-						}
-						else
-						{
-							if(speed_body_x > params.limit_speed_x * speed_limit_height_factor)
-								speed_sp.vx = params.limit_speed_x * speed_limit_height_factor;
-							if(speed_body_x < -params.limit_speed_x * speed_limit_height_factor)
-								speed_sp.vx = -params.limit_speed_x * speed_limit_height_factor;
-						}
-
-						if((speed_body_y <= params.limit_speed_y * speed_limit_height_factor) &&
-								(speed_body_y >= -params.limit_speed_y * speed_limit_height_factor))
-						{
-							speed_sp.vy = speed_body_y;
-						}
-						else
-						{
-							if(speed_body_y > params.limit_speed_y * speed_limit_height_factor)
-								speed_sp.vy = params.limit_speed_y * speed_limit_height_factor;
-							if(speed_body_y < -params.limit_speed_y * speed_limit_height_factor)
-								speed_sp.vy = -params.limit_speed_y * speed_limit_height_factor;
-						}
-
-						/* manual yaw change */
-						if(isfinite(manual_yaw) && isfinite(manual.throttle))
-						{
-							if(fabsf(manual_yaw) > params.manual_threshold && manual.throttle > 0.2f)
-							{
-								yaw_sp += manual_yaw * params.limit_yaw_step;
-
-								/* modulo for rotation -pi +pi */
-								if(yaw_sp < -M_PI_F)
-									yaw_sp = yaw_sp + M_TWOPI_F;
-								else if(yaw_sp > M_PI_F)
-									yaw_sp = yaw_sp - M_TWOPI_F;
-							}
-						}
-
-						/* forward yaw setpoint */
-						speed_sp.yaw_sp = yaw_sp;
-
-
-						/* manual height control
-						 * 0-20%: thrust linear down
-						 * 20%-40%: down
-						 * 40%-60%: stabilize altitude
-						 * 60-100%: up
-						 */
-						float thrust_control = 0.0f;
-
-						if (isfinite(manual.throttle))
-						{
-							if (start_phase)
-							{
-								/* control start thrust with stick input */
-								if (manual.throttle < 0.4f)
-								{
-									/* first 40% for up to feedforward */
-									thrust_control = manual.throttle / 0.4f * params.thrust_feedforward;
-								}
-								else
-								{
-									/* second 60% for up to feedforward + 10% */
-									thrust_control = (manual.throttle - 0.4f) / 0.6f * 0.1f + params.thrust_feedforward;
-								}
-
-								/* exit start phase if setpoint is reached */
-								if (height_sp < -local_pos.z && thrust_control > params.limit_thrust_lower)
-								{
-									start_phase = false;
-									/* switch to stabilize */
-									thrust_control = params.thrust_feedforward;
-								}
-							}
-							else
-							{
-								if (manual.throttle < 0.2f)
-								{
-									/* landing initialization */
-									if (!landing_initialized)
-									{
-										/* consider last thrust control to avoid steps */
-										landing_thrust_start = speed_sp.thrust_sp;
-										landing_initialized = true;
-									}
-
-									/* set current height as setpoint to avoid steps */
-									if (-local_pos.z > params.height_min)
-										height_sp = -local_pos.z;
-									else
-										height_sp = params.height_min;
-
-									/* lower 20% stick range controls thrust down */
-									thrust_control = manual.throttle / 0.2f * landing_thrust_start;
-
-									/* assume ground position here */
-									if (thrust_control < 0.1f)
-									{
-										/* reset integral if on ground */
-										integrated_h_error = 0.0f;
-										/* switch to start phase */
-										start_phase = true;
-										/* reset height setpoint */
-										height_sp = params.height_min;
-									}
-								}
-								else
-								{
-									/* stabilized mode */
-									landing_initialized = false;
-
-									/* calc new thrust with PID */
-									float height_error = (local_pos.z - (-height_sp));
-
-									/* update height setpoint if needed*/
-									if (manual.throttle < 0.4f)
-									{
-										/* down */
-										if (height_sp > params.height_min + params.height_rate &&
-												fabsf(height_error) < params.limit_height_error)
-											height_sp -= params.height_rate * dt;
-									}
-
-									if (manual.throttle > 0.6f)
-									{
-										/* up */
-										if (height_sp < params.height_max &&
-												fabsf(height_error) < params.limit_height_error)
-											height_sp += params.height_rate * dt;
-									}
-
-									/* instead of speed limitation, limit height error (downwards) */
-									if(height_error > params.limit_height_error)
-										height_error = params.limit_height_error;
-									else if(height_error < -params.limit_height_error)
-										height_error = -params.limit_height_error;
-
-									integrated_h_error = integrated_h_error + height_error;
-									float integrated_thrust_addition = integrated_h_error * params.height_i;
-
-									if(integrated_thrust_addition > params.limit_thrust_int)
-										integrated_thrust_addition = params.limit_thrust_int;
-									if(integrated_thrust_addition < -params.limit_thrust_int)
-										integrated_thrust_addition = -params.limit_thrust_int;
-
-									float height_speed = last_local_pos_z - local_pos.z;
-									float thrust_diff = height_error * params.height_p - height_speed * params.height_d;
-
-									thrust_control = params.thrust_feedforward + thrust_diff + integrated_thrust_addition;
-
-									/* add attitude component
-									 * F = Fz / (cos(pitch)*cos(roll)) -> can be found in rotM
-									 */
-//									// TODO problem with attitude
-//									if (att.R_valid && att.R[2][2] > 0)
-//										thrust_control = thrust_control / att.R[2][2];
-
-									/* set thrust lower limit */
-									if(thrust_control < params.limit_thrust_lower)
-										thrust_control = params.limit_thrust_lower;
-								}
-							}
-
-							/* set thrust upper limit */
-							if(thrust_control > params.limit_thrust_upper)
-								thrust_control = params.limit_thrust_upper;
-						}
-						/* store actual height for speed estimation */
-						last_local_pos_z = local_pos.z;
-
-						speed_sp.thrust_sp =  thrust_control; //manual.throttle;
-						speed_sp.timestamp = hrt_absolute_time();
-
-						/* publish new speed setpoint */
-						if(isfinite(speed_sp.vx) && isfinite(speed_sp.vy) && isfinite(speed_sp.yaw_sp) && isfinite(speed_sp.thrust_sp))
-						{
-
-							if(speed_setpoint_adverted)
-							{
-								orb_publish(ORB_ID(vehicle_bodyframe_speed_setpoint), speed_sp_pub, &speed_sp);
-							}
-							else
-							{
-								speed_sp_pub = orb_advertise(ORB_ID(vehicle_bodyframe_speed_setpoint), &speed_sp);
-								speed_setpoint_adverted = true;
-							}
-						}
-						else
-						{
-							warnx("NaN in flow position controller!");
-						}
-					}
-					else
-					{
-						/* in manual or stabilized state just reset speed and flow sum setpoint */
-						//mavlink_log_info(mavlink_fd,"[fpc] reset speed sp, flow_sp_sumx,y (%f,%f)",filtered_flow.sumx, filtered_flow.sumy);
-						if(status_changed == true)
-							mavlink_log_info(mavlink_fd,"[fpc] flow POSITION controller disengaged.");
-
-						status_changed = false;
-						speed_sp.vx = 0.0f;
-						speed_sp.vy = 0.0f;
-						flow_sp_sumx = filtered_flow.sumx;
-						flow_sp_sumy = filtered_flow.sumy;
-						if(isfinite(att.yaw))
-						{
-							yaw_sp = att.yaw;
-							speed_sp.yaw_sp = att.yaw;
-						}
-						if(isfinite(manual.throttle))
-							speed_sp.thrust_sp = manual.throttle;
-					}
-					/* measure in what intervals the controller runs */
-					perf_count(mc_interval_perf);
-					perf_end(mc_loop_perf);
-				}
-			}
-
-			counter++;
-		}
-		else
-		{
-			/* sensors not ready waiting for first attitude msg */
-
-			/* polling */
-			struct pollfd fds[1] = {
-				{ .fd = vehicle_attitude_sub, .events = POLLIN },
-			};
-
-			/* wait for a flow msg, check for exit condition every 5 s */
-			int ret = poll(fds, 1, 5000);
-
-			if (ret < 0)
-			{
-				/* poll error, count it in perf */
-				perf_count(mc_err_perf);
-			}
-			else if (ret == 0)
-			{
-				/* no return value, ignore */
-				mavlink_log_info(mavlink_fd,"[fpc] no attitude received.\n");
-			}
-			else
-			{
-				if (fds[0].revents & POLLIN)
-				{
-					sensors_ready = true;
-					mavlink_log_info(mavlink_fd,"[fpc] initialized.\n");
-				}
-			}
-		}
-	}
-
-	mavlink_log_info(mavlink_fd,"[fpc] ending now...\n");
-
-	thread_running = false;
-
-	close(parameter_update_sub);
-	close(vehicle_attitude_sub);
-	close(vehicle_local_position_sub);
-	close(armed_sub);
-	close(control_mode_sub);
-	close(manual_control_setpoint_sub);
-	close(speed_sp_pub);
-
-	perf_print_counter(mc_loop_perf);
-	perf_free(mc_loop_perf);
-
-	fflush(stdout);
-	return 0;
-}
-
diff --git a/src/examples/flow_position_control/flow_position_control_params.c b/src/examples/flow_position_control/flow_position_control_params.c
deleted file mode 100644
index eb1473647..000000000
--- a/src/examples/flow_position_control/flow_position_control_params.c
+++ /dev/null
@@ -1,124 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (C) 2008-2013 PX4 Development Team. All rights reserved.
- *   Author: Samuel Zihlmann <samuezih@ee.ethz.ch>
- *   		 Lorenz Meier <lm@inf.ethz.ch>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/*
- * @file flow_position_control_params.c
- */
-
-#include "flow_position_control_params.h"
-
-/* controller parameters */
-
-// Position control P gain
-PARAM_DEFINE_FLOAT(FPC_POS_P, 3.0f);
-// Position control D / damping gain
-PARAM_DEFINE_FLOAT(FPC_POS_D, 0.0f);
-// Altitude control P gain
-PARAM_DEFINE_FLOAT(FPC_H_P, 0.15f);
-// Altitude control I (integrator) gain
-PARAM_DEFINE_FLOAT(FPC_H_I, 0.00001f);
-// Altitude control D gain
-PARAM_DEFINE_FLOAT(FPC_H_D, 0.8f);
-// Altitude control rate limiter
-PARAM_DEFINE_FLOAT(FPC_H_RATE, 0.1f);
-// Altitude control minimum altitude
-PARAM_DEFINE_FLOAT(FPC_H_MIN, 0.5f);
-// Altitude control maximum altitude (higher than 1.5m is untested)
-PARAM_DEFINE_FLOAT(FPC_H_MAX, 1.5f);
-// Altitude control feed forward throttle - adjust to the
-// throttle position (0..1) where the copter hovers in manual flight
-PARAM_DEFINE_FLOAT(FPC_T_FFWD, 0.7f); // adjust this before flight
-PARAM_DEFINE_FLOAT(FPC_L_S_X, 1.2f);
-PARAM_DEFINE_FLOAT(FPC_L_S_Y, 1.2f);
-PARAM_DEFINE_FLOAT(FPC_L_H_ERR, 0.1f);
-PARAM_DEFINE_FLOAT(FPC_L_TH_I, 0.05f);
-PARAM_DEFINE_FLOAT(FPC_L_TH_U, 0.8f);
-PARAM_DEFINE_FLOAT(FPC_L_TH_L, 0.6f);
-PARAM_DEFINE_FLOAT(FPC_L_YAW_STEP, 0.03f);
-PARAM_DEFINE_FLOAT(FPC_MAN_THR, 0.1f);
-
-
-int parameters_init(struct flow_position_control_param_handles *h)
-{
-	/* PID parameters */
-	h->pos_p	 			=	param_find("FPC_POS_P");
-	h->pos_d 				=	param_find("FPC_POS_D");
-	h->height_p 			=	param_find("FPC_H_P");
-	h->height_i 			=	param_find("FPC_H_I");
-	h->height_d 			=	param_find("FPC_H_D");
-	h->height_rate 			=	param_find("FPC_H_RATE");
-	h->height_min			=	param_find("FPC_H_MIN");
-	h->height_max			=	param_find("FPC_H_MAX");
-	h->thrust_feedforward 	=	param_find("FPC_T_FFWD");
-	h->limit_speed_x 		=	param_find("FPC_L_S_X");
-	h->limit_speed_y 		=	param_find("FPC_L_S_Y");
-	h->limit_height_error	=	param_find("FPC_L_H_ERR");
-	h->limit_thrust_int 	=	param_find("FPC_L_TH_I");
-	h->limit_thrust_upper 	=	param_find("FPC_L_TH_U");
-	h->limit_thrust_lower 	=	param_find("FPC_L_TH_L");
-	h->limit_yaw_step		=	param_find("FPC_L_YAW_STEP");
-	h->manual_threshold 	=	param_find("FPC_MAN_THR");
-	h->rc_scale_pitch		=   param_find("RC_SCALE_PITCH");
-	h->rc_scale_roll		=   param_find("RC_SCALE_ROLL");
-	h->rc_scale_yaw			=   param_find("RC_SCALE_YAW");
-
-	return OK;
-}
-
-int parameters_update(const struct flow_position_control_param_handles *h, struct flow_position_control_params *p)
-{
-	param_get(h->pos_p, &(p->pos_p));
-	param_get(h->pos_d, &(p->pos_d));
-	param_get(h->height_p, &(p->height_p));
-	param_get(h->height_i, &(p->height_i));
-	param_get(h->height_d, &(p->height_d));
-	param_get(h->height_rate, &(p->height_rate));
-	param_get(h->height_min, &(p->height_min));
-	param_get(h->height_max, &(p->height_max));
-	param_get(h->thrust_feedforward, &(p->thrust_feedforward));
-	param_get(h->limit_speed_x, &(p->limit_speed_x));
-	param_get(h->limit_speed_y, &(p->limit_speed_y));
-	param_get(h->limit_height_error, &(p->limit_height_error));
-	param_get(h->limit_thrust_int, &(p->limit_thrust_int));
-	param_get(h->limit_thrust_upper, &(p->limit_thrust_upper));
-	param_get(h->limit_thrust_lower, &(p->limit_thrust_lower));
-	param_get(h->limit_yaw_step, &(p->limit_yaw_step));
-	param_get(h->manual_threshold, &(p->manual_threshold));
-	param_get(h->rc_scale_pitch, &(p->rc_scale_pitch));
-	param_get(h->rc_scale_roll, &(p->rc_scale_roll));
-	param_get(h->rc_scale_yaw, &(p->rc_scale_yaw));
-
-	return OK;
-}
diff --git a/src/examples/flow_position_control/flow_position_control_params.h b/src/examples/flow_position_control/flow_position_control_params.h
deleted file mode 100644
index d0c8fc722..000000000
--- a/src/examples/flow_position_control/flow_position_control_params.h
+++ /dev/null
@@ -1,100 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (C) 2008-2013 PX4 Development Team. All rights reserved.
- *   Author: Samuel Zihlmann <samuezih@ee.ethz.ch>
- *   		 Lorenz Meier <lm@inf.ethz.ch>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/*
- * @file flow_position_control_params.h
- * 
- * Parameters for position controller
- */
-
-#include <systemlib/param/param.h>
-
-struct flow_position_control_params {
-	float pos_p;
-	float pos_d;
-	float height_p;
-	float height_i;
-	float height_d;
-	float height_rate;
-	float height_min;
-	float height_max;
-	float thrust_feedforward;
-	float limit_speed_x;
-	float limit_speed_y;
-	float limit_height_error;
-	float limit_thrust_int;
-	float limit_thrust_upper;
-	float limit_thrust_lower;
-	float limit_yaw_step;
-	float manual_threshold;
-	float rc_scale_pitch;
-	float rc_scale_roll;
-	float rc_scale_yaw;
-};
-
-struct flow_position_control_param_handles {
-	param_t pos_p;
-	param_t pos_d;
-	param_t height_p;
-	param_t height_i;
-	param_t height_d;
-	param_t height_rate;
-	param_t height_min;
-	param_t height_max;
-	param_t thrust_feedforward;
-	param_t limit_speed_x;
-	param_t limit_speed_y;
-	param_t limit_height_error;
-	param_t limit_thrust_int;
-	param_t limit_thrust_upper;
-	param_t limit_thrust_lower;
-	param_t limit_yaw_step;
-	param_t manual_threshold;
-	param_t rc_scale_pitch;
-	param_t rc_scale_roll;
-	param_t rc_scale_yaw;
-};
-
-/**
- * Initialize all parameter handles and values
- *
- */
-int parameters_init(struct flow_position_control_param_handles *h);
-
-/**
- * Update all parameters
- *
- */
-int parameters_update(const struct flow_position_control_param_handles *h, struct flow_position_control_params *p);
diff --git a/src/examples/flow_position_control/module.mk b/src/examples/flow_position_control/module.mk
deleted file mode 100644
index b10dc490a..000000000
--- a/src/examples/flow_position_control/module.mk
+++ /dev/null
@@ -1,41 +0,0 @@
-############################################################################
-#
-#   Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions
-# are met:
-#
-# 1. Redistributions of source code must retain the above copyright
-#    notice, this list of conditions and the following disclaimer.
-# 2. Redistributions in binary form must reproduce the above copyright
-#    notice, this list of conditions and the following disclaimer in
-#    the documentation and/or other materials provided with the
-#    distribution.
-# 3. Neither the name PX4 nor the names of its contributors may be
-#    used to endorse or promote products derived from this software
-#    without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
-# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
-# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-# POSSIBILITY OF SUCH DAMAGE.
-#
-############################################################################
-
-#
-# Build multirotor position control
-#
-
-MODULE_COMMAND	= flow_position_control
-
-SRCS		= flow_position_control_main.c \
-		  flow_position_control_params.c
diff --git a/src/examples/flow_position_estimator/flow_position_estimator_main.c b/src/examples/flow_position_estimator/flow_position_estimator_main.c
index 495c415f2..c775428ef 100644
--- a/src/examples/flow_position_estimator/flow_position_estimator_main.c
+++ b/src/examples/flow_position_estimator/flow_position_estimator_main.c
@@ -65,6 +65,7 @@
 #include <uORB/topics/optical_flow.h>
 #include <uORB/topics/filtered_bottom_flow.h>
 #include <systemlib/perf_counter.h>
+#include <systemlib/systemlib.h>
 #include <poll.h>
 
 #include "flow_position_estimator_params.h"
@@ -109,9 +110,9 @@ int flow_position_estimator_main(int argc, char *argv[])
 
 		thread_should_exit = false;
 		daemon_task = task_spawn_cmd("flow_position_estimator",
-					 SCHED_RR,
+					 SCHED_DEFAULT,
 					 SCHED_PRIORITY_MAX - 5,
-					 4096,
+					 4000,
 					 flow_position_estimator_thread_main,
 					 (argv) ? (const char **)&argv[2] : (const char **)NULL);
 		exit(0);
diff --git a/src/examples/px4_daemon_app/module.mk b/src/examples/px4_daemon_app/module.mk
index 5f8aa73d5..fc4223142 100644
--- a/src/examples/px4_daemon_app/module.mk
+++ b/src/examples/px4_daemon_app/module.mk
@@ -38,3 +38,5 @@
 MODULE_COMMAND		= px4_daemon_app
 
 SRCS			= px4_daemon_app.c
+
+MODULE_STACKSIZE = 1200
diff --git a/src/examples/px4_daemon_app/px4_daemon_app.c b/src/examples/px4_daemon_app/px4_daemon_app.c
index 53f1b4a9a..3eaf14148 100644
--- a/src/examples/px4_daemon_app/px4_daemon_app.c
+++ b/src/examples/px4_daemon_app/px4_daemon_app.c
@@ -98,7 +98,7 @@ int px4_daemon_app_main(int argc, char *argv[])
 		daemon_task = task_spawn_cmd("daemon",
 					 SCHED_DEFAULT,
 					 SCHED_PRIORITY_DEFAULT,
-					 4096,
+					 2000,
 					 px4_daemon_thread_main,
 					 (argv) ? (const char **)&argv[2] : (const char **)NULL);
 		exit(0);
diff --git a/src/examples/px4_mavlink_debug/module.mk b/src/examples/px4_mavlink_debug/module.mk
index fefd61496..c7ef97fc4 100644
--- a/src/examples/px4_mavlink_debug/module.mk
+++ b/src/examples/px4_mavlink_debug/module.mk
@@ -37,4 +37,6 @@
 
 MODULE_COMMAND		= px4_mavlink_debug
 
-SRCS			= px4_mavlink_debug.c
\ No newline at end of file
+SRCS			= px4_mavlink_debug.c
+
+MODULE_STACKSIZE = 2000
diff --git a/src/examples/px4_simple_app/px4_simple_app.c b/src/examples/px4_simple_app/px4_simple_app.c
index 44e6dc7f3..4e9f099ed 100644
--- a/src/examples/px4_simple_app/px4_simple_app.c
+++ b/src/examples/px4_simple_app/px4_simple_app.c
@@ -41,6 +41,7 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <poll.h>
+#include <string.h>
 
 #include <uORB/uORB.h>
 #include <uORB/topics/sensor_combined.h>
diff --git a/src/lib/ecl/attitude_fw/ecl_pitch_controller.cpp b/src/lib/ecl/attitude_fw/ecl_pitch_controller.cpp
index 9584924cc..46db788a6 100644
--- a/src/lib/ecl/attitude_fw/ecl_pitch_controller.cpp
+++ b/src/lib/ecl/attitude_fw/ecl_pitch_controller.cpp
@@ -61,13 +61,24 @@ ECL_PitchController::ECL_PitchController() :
 	_integrator(0.0f),
 	_rate_error(0.0f),
 	_rate_setpoint(0.0f),
-	_bodyrate_setpoint(0.0f)
+	_bodyrate_setpoint(0.0f),
+	_nonfinite_input_perf(perf_alloc(PC_COUNT, "fw att control pitch nonfinite input"))
 {
 }
 
-float ECL_PitchController::control_attitude(float pitch_setpoint, float roll, float pitch, float airspeed)
+ECL_PitchController::~ECL_PitchController()
 {
+	perf_free(_nonfinite_input_perf);
+}
 
+float ECL_PitchController::control_attitude(float pitch_setpoint, float roll, float pitch, float airspeed)
+{
+	/* Do not calculate control signal with bad inputs */
+	if (!(isfinite(pitch_setpoint) && isfinite(roll) && isfinite(pitch) && isfinite(airspeed))) {
+		perf_count(_nonfinite_input_perf);
+		warnx("not controlling pitch");
+		return _rate_setpoint;
+	}
 
 	/* flying inverted (wings upside down) ? */
 	bool inverted = false;
@@ -123,6 +134,14 @@ float ECL_PitchController::control_bodyrate(float roll, float pitch,
 		float yaw_rate_setpoint,
 		float airspeed_min, float airspeed_max, float airspeed, float scaler, bool lock_integrator)
 {
+	/* Do not calculate control signal with bad inputs */
+	if (!(isfinite(roll) && isfinite(pitch) && isfinite(pitch_rate) && isfinite(yaw_rate) &&
+				isfinite(yaw_rate_setpoint) && isfinite(airspeed_min) &&
+				isfinite(airspeed_max) && isfinite(scaler))) {
+		perf_count(_nonfinite_input_perf);
+		return math::constrain(_last_output, -1.0f, 1.0f);
+	}
+
 	/* get the usual dt estimate */
 	uint64_t dt_micros = ecl_elapsed_time(&_last_run);
 	_last_run = ecl_absolute_time();
@@ -132,9 +151,6 @@ float ECL_PitchController::control_bodyrate(float roll, float pitch,
 	if (dt_micros > 500000)
 		lock_integrator = true;
 
-//	float k_ff = math::max((_k_p - _k_i * _tc) * _tc - _k_d, 0.0f);
-	float k_ff = 0;
-
 	/* input conditioning */
 	if (!isfinite(airspeed)) {
 		/* airspeed is NaN, +- INF or not available, pick center of band */
diff --git a/src/lib/ecl/attitude_fw/ecl_pitch_controller.h b/src/lib/ecl/attitude_fw/ecl_pitch_controller.h
index 30a82a86a..39b9f9d03 100644
--- a/src/lib/ecl/attitude_fw/ecl_pitch_controller.h
+++ b/src/lib/ecl/attitude_fw/ecl_pitch_controller.h
@@ -51,12 +51,15 @@
 
 #include <stdbool.h>
 #include <stdint.h>
+#include <systemlib/perf_counter.h>
 
 class __EXPORT ECL_PitchController //XXX: create controller superclass
 {
 public:
 	ECL_PitchController();
 
+	~ECL_PitchController();
+
 	float control_attitude(float pitch_setpoint, float roll, float pitch, float airspeed);
 
 
@@ -126,6 +129,7 @@ private:
 	float _rate_error;
 	float _rate_setpoint;
 	float _bodyrate_setpoint;
+	perf_counter_t _nonfinite_input_perf;
 };
 
 #endif // ECL_PITCH_CONTROLLER_H
diff --git a/src/lib/ecl/attitude_fw/ecl_roll_controller.cpp b/src/lib/ecl/attitude_fw/ecl_roll_controller.cpp
index 2e86c72dc..9894a34d7 100644
--- a/src/lib/ecl/attitude_fw/ecl_roll_controller.cpp
+++ b/src/lib/ecl/attitude_fw/ecl_roll_controller.cpp
@@ -59,12 +59,23 @@ ECL_RollController::ECL_RollController() :
 	_integrator(0.0f),
 	_rate_error(0.0f),
 	_rate_setpoint(0.0f),
-	_bodyrate_setpoint(0.0f)
+	_bodyrate_setpoint(0.0f),
+	_nonfinite_input_perf(perf_alloc(PC_COUNT, "fw att control roll nonfinite input"))
 {
 }
 
+ECL_RollController::~ECL_RollController()
+{
+	perf_free(_nonfinite_input_perf);
+}
+
 float ECL_RollController::control_attitude(float roll_setpoint, float roll)
 {
+	/* Do not calculate control signal with bad inputs */
+	if (!(isfinite(roll_setpoint) && isfinite(roll))) {
+		perf_count(_nonfinite_input_perf);
+		return _rate_setpoint;
+	}
 
 	/* Calculate error */
 	float roll_error = roll_setpoint - roll;
@@ -86,6 +97,14 @@ float ECL_RollController::control_bodyrate(float pitch,
 		float yaw_rate_setpoint,
 		float airspeed_min, float airspeed_max, float airspeed, float scaler, bool lock_integrator)
 {
+	/* Do not calculate control signal with bad inputs */
+	if (!(isfinite(pitch) && isfinite(roll_rate) && isfinite(yaw_rate) && isfinite(yaw_rate_setpoint) &&
+			isfinite(airspeed_min) && isfinite(airspeed_max) &&
+			isfinite(scaler))) {
+		perf_count(_nonfinite_input_perf);
+		return math::constrain(_last_output, -1.0f, 1.0f);
+	}
+
 	/* get the usual dt estimate */
 	uint64_t dt_micros = ecl_elapsed_time(&_last_run);
 	_last_run = ecl_absolute_time();
@@ -95,9 +114,6 @@ float ECL_RollController::control_bodyrate(float pitch,
 	if (dt_micros > 500000)
 		lock_integrator = true;
 
-//	float k_ff = math::max((_k_p - _k_i * _tc) * _tc - _k_d, 0.0f);
-	float k_ff = 0; //xxx: param
-
 	/* input conditioning */
 //	warnx("airspeed pre %.4f", (double)airspeed);
 	if (!isfinite(airspeed)) {
@@ -122,8 +138,8 @@ float ECL_RollController::control_bodyrate(float pitch,
 		float id = _rate_error * dt;
 
 		/*
-		 * anti-windup: do not allow integrator to increase if actuator is at limit
-		 */
+		* anti-windup: do not allow integrator to increase if actuator is at limit
+		*/
 		if (_last_output < -1.0f) {
 			/* only allow motion to center: increase value */
 			id = math::max(id, 0.0f);
diff --git a/src/lib/ecl/attitude_fw/ecl_roll_controller.h b/src/lib/ecl/attitude_fw/ecl_roll_controller.h
index 92c64b95f..0799dbe03 100644
--- a/src/lib/ecl/attitude_fw/ecl_roll_controller.h
+++ b/src/lib/ecl/attitude_fw/ecl_roll_controller.h
@@ -51,12 +51,15 @@
 
 #include <stdbool.h>
 #include <stdint.h>
+#include <systemlib/perf_counter.h>
 
 class __EXPORT ECL_RollController //XXX: create controller superclass
 {
 public:
 	ECL_RollController();
 
+	~ECL_RollController();
+
 	float control_attitude(float roll_setpoint, float roll);
 
 	float control_bodyrate(float pitch,
@@ -117,6 +120,7 @@ private:
 	float _rate_error;
 	float _rate_setpoint;
 	float _bodyrate_setpoint;
+	perf_counter_t _nonfinite_input_perf;
 };
 
 #endif // ECL_ROLL_CONTROLLER_H
diff --git a/src/lib/ecl/attitude_fw/ecl_yaw_controller.cpp b/src/lib/ecl/attitude_fw/ecl_yaw_controller.cpp
index 255776765..fe03b8065 100644
--- a/src/lib/ecl/attitude_fw/ecl_yaw_controller.cpp
+++ b/src/lib/ecl/attitude_fw/ecl_yaw_controller.cpp
@@ -58,20 +58,33 @@ ECL_YawController::ECL_YawController() :
 	_rate_error(0.0f),
 	_rate_setpoint(0.0f),
 	_bodyrate_setpoint(0.0f),
-	_coordinated_min_speed(1.0f)
+	_coordinated_min_speed(1.0f),
+	_nonfinite_input_perf(perf_alloc(PC_COUNT, "fw att control yaw nonfinite input"))
 {
 }
 
+ECL_YawController::~ECL_YawController()
+{
+	perf_free(_nonfinite_input_perf);
+}
+
 float ECL_YawController::control_attitude(float roll, float pitch,
 		float speed_body_u, float speed_body_v, float speed_body_w,
 		float roll_rate_setpoint, float pitch_rate_setpoint)
 {
+	/* Do not calculate control signal with bad inputs */
+	if (!(isfinite(roll) && isfinite(pitch) && isfinite(speed_body_u) && isfinite(speed_body_v) &&
+				isfinite(speed_body_w) && isfinite(roll_rate_setpoint) &&
+				isfinite(pitch_rate_setpoint))) {
+		perf_count(_nonfinite_input_perf);
+		return _rate_setpoint;
+	}
 //	static int counter = 0;
 	/* Calculate desired yaw rate from coordinated turn constraint / (no side forces) */
 	_rate_setpoint = 0.0f;
 	if (sqrtf(speed_body_u * speed_body_u + speed_body_v * speed_body_v + speed_body_w * speed_body_w) > _coordinated_min_speed) {
 		float denumerator = (speed_body_u * cosf(roll) * cosf(pitch) + speed_body_w * sinf(pitch));
-		if(denumerator != 0.0f) { //XXX: floating point comparison
+		if(fabsf(denumerator) > FLT_EPSILON) {
 			_rate_setpoint = (speed_body_w * roll_rate_setpoint + 9.81f * sinf(roll) * cosf(pitch) + speed_body_u * pitch_rate_setpoint * sinf(roll)) / denumerator;
 //			warnx("yaw: speed_body_u %.f speed_body_w %1.f roll %.1f pitch %.1f denumerator %.1f _rate_setpoint %.1f", speed_body_u, speed_body_w, denumerator, _rate_setpoint);
 		}
@@ -103,6 +116,13 @@ float ECL_YawController::control_bodyrate(float roll, float pitch,
 		float pitch_rate_setpoint,
 		float airspeed_min, float airspeed_max, float airspeed, float scaler, bool lock_integrator)
 {
+	/* Do not calculate control signal with bad inputs */
+	if (!(isfinite(roll) && isfinite(pitch) && isfinite(pitch_rate) && isfinite(yaw_rate) &&
+				isfinite(pitch_rate_setpoint) && isfinite(airspeed_min) &&
+				isfinite(airspeed_max) && isfinite(scaler))) {
+		perf_count(_nonfinite_input_perf);
+		return math::constrain(_last_output, -1.0f, 1.0f);
+	}
 	/* get the usual dt estimate */
 	uint64_t dt_micros = ecl_elapsed_time(&_last_run);
 	_last_run = ecl_absolute_time();
@@ -112,11 +132,6 @@ float ECL_YawController::control_bodyrate(float roll, float pitch,
 	if (dt_micros > 500000)
 		lock_integrator = true;
 
-
-//	float k_ff = math::max((_k_p - _k_i * _tc) * _tc - _k_d, 0.0f);
-	float k_ff = 0;
-
-
 	/* input conditioning */
 	if (!isfinite(airspeed)) {
 	/* airspeed is NaN, +- INF or not available, pick center of band */
diff --git a/src/lib/ecl/attitude_fw/ecl_yaw_controller.h b/src/lib/ecl/attitude_fw/ecl_yaw_controller.h
index 03f3202d0..a360c14b8 100644
--- a/src/lib/ecl/attitude_fw/ecl_yaw_controller.h
+++ b/src/lib/ecl/attitude_fw/ecl_yaw_controller.h
@@ -50,12 +50,15 @@
 
 #include <stdbool.h>
 #include <stdint.h>
+#include <systemlib/perf_counter.h>
 
 class __EXPORT ECL_YawController //XXX: create controller superclass
 {
 public:
 	ECL_YawController();
 
+	~ECL_YawController();
+
 	float control_attitude(float roll, float pitch,
 			float speed_body_u, float speed_body_v, float speed_body_w,
 			float roll_rate_setpoint, float pitch_rate_setpoint);
@@ -118,6 +121,7 @@ private:
 	float _rate_setpoint;
 	float _bodyrate_setpoint;
 	float _coordinated_min_speed;
+	perf_counter_t _nonfinite_input_perf;
 
 };
 
diff --git a/src/lib/geo/geo.c b/src/lib/geo/geo.c
index f72dc607c..212e33ff8 100644
--- a/src/lib/geo/geo.c
+++ b/src/lib/geo/geo.c
@@ -1,9 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: Thomas Gubler <thomasgubler@student.ethz.ch>
- *           Julian Oes <joes@student.ethz.ch>
- *           Lorenz Meier <lm@inf.ethz.ch>
+ *   Copyright (C) 2012, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -42,6 +39,7 @@
  * @author Thomas Gubler <thomasgubler@student.ethz.ch>
  * @author Julian Oes <joes@student.ethz.ch>
  * @author Lorenz Meier <lm@inf.ethz.ch>
+ * @author Anton Babushkin <anton.babushkin@me.com>
  */
 
 #include <geo/geo.h>
@@ -52,124 +50,58 @@
 #include <math.h>
 #include <stdbool.h>
 
+/*
+ * Azimuthal Equidistant Projection
+ * formulas according to: http://mathworld.wolfram.com/AzimuthalEquidistantProjection.html
+ */
 
-/* values for map projection */
-static double phi_1;
-static double sin_phi_1;
-static double cos_phi_1;
-static double lambda_0;
-static double scale;
-
-__EXPORT void map_projection_init(double lat_0, double lon_0) //lat_0, lon_0 are expected to be in correct format: -> 47.1234567 and not 471234567
+__EXPORT void map_projection_init(struct map_projection_reference_s *ref, double lat_0, double lon_0) //lat_0, lon_0 are expected to be in correct format: -> 47.1234567 and not 471234567
 {
-	/* notation and formulas according to: http://mathworld.wolfram.com/AzimuthalEquidistantProjection.html */
-	phi_1 = lat_0 / 180.0 * M_PI;
-	lambda_0 = lon_0 / 180.0 * M_PI;
-
-	sin_phi_1 = sin(phi_1);
-	cos_phi_1 = cos(phi_1);
-
-	/* calculate local scale by using the relation of true distance and the distance on plane */ //TODO: this is a quick solution, there are probably easier ways to determine the scale
-
-	/* 1) calculate true distance d on sphere to a point: http://www.movable-type.co.uk/scripts/latlong.html */
-
-	double lat1 = phi_1;
-	double lon1 = lambda_0;
-
-	double lat2 = phi_1 + 0.5 / 180 * M_PI;
-	double lon2 = lambda_0 + 0.5 / 180 * M_PI;
-	double sin_lat_2 = sin(lat2);
-	double cos_lat_2 = cos(lat2);
-	double d = acos(sin(lat1) * sin_lat_2 + cos(lat1) * cos_lat_2 * cos(lon2 - lon1)) * CONSTANTS_RADIUS_OF_EARTH;
-
-	/* 2) calculate distance rho on plane */
-	double k_bar = 0;
-	double c =  acos(sin_phi_1 * sin_lat_2 + cos_phi_1 * cos_lat_2 * cos(lon2 - lambda_0));
-
-	if (0 != c)
-		k_bar = c / sin(c);
-
-	double x2 = k_bar * (cos_lat_2 * sin(lon2 - lambda_0)); //Projection of point 2 on plane
-	double y2 = k_bar * ((cos_phi_1 * sin_lat_2 - sin_phi_1 * cos_lat_2 * cos(lon2 - lambda_0)));
-	double rho = sqrt(pow(x2, 2) + pow(y2, 2));
-
-	scale = d / rho;
+	ref->lat = lat_0 / 180.0 * M_PI;
+	ref->lon = lon_0 / 180.0 * M_PI;
 
+	ref->sin_lat = sin(ref->lat);
+	ref->cos_lat = cos(ref->lat);
 }
 
-__EXPORT void map_projection_project(double lat, double lon, float *x, float *y)
+__EXPORT void map_projection_project(struct map_projection_reference_s *ref, double lat, double lon, float *x, float *y)
 {
-	/* notation and formulas accoring to: http://mathworld.wolfram.com/AzimuthalEquidistantProjection.html */
-	double phi = lat / 180.0 * M_PI;
-	double lambda = lon / 180.0 * M_PI;
-
-	double sin_phi = sin(phi);
-	double cos_phi = cos(phi);
-
-	double k_bar = 0;
-	/* using small angle approximation (formula in comment is without aproximation) */
-	double c =  acos(sin_phi_1 * sin_phi + cos_phi_1 * cos_phi * (1 - pow((lambda - lambda_0), 2) / 2)); //double c =  acos( sin_phi_1 * sin_phi + cos_phi_1 * cos_phi * cos(lambda - lambda_0) );
+	double lat_rad = lat / 180.0 * M_PI;
+	double lon_rad = lon / 180.0 * M_PI;
 
-	if (0 != c)
-		k_bar = c / sin(c);
+	double sin_lat = sin(lat_rad);
+	double cos_lat = cos(lat_rad);
+	double cos_d_lon = cos(lon_rad - ref->lon);
 
-	/* using small angle approximation (formula in comment is without aproximation) */
-	*y = k_bar * (cos_phi * (lambda - lambda_0)) * scale;//*y = k_bar * (cos_phi * sin(lambda - lambda_0)) * scale;
-	*x = k_bar * ((cos_phi_1 * sin_phi - sin_phi_1 * cos_phi * (1 - pow((lambda - lambda_0), 2) / 2))) * scale; //	*x = k_bar * ((cos_phi_1 * sin_phi - sin_phi_1 * cos_phi * cos(lambda - lambda_0))) * scale;
+	double c = acos(ref->sin_lat * sin_lat + ref->cos_lat * cos_lat * cos_d_lon);
+	double k = (c == 0.0) ? 1.0 : (c / sin(c));
 
-//	printf("%phi_1=%.10f, lambda_0 =%.10f\n", phi_1, lambda_0);
+	*x = k * (ref->cos_lat * sin_lat - ref->sin_lat * cos_lat * cos_d_lon) * CONSTANTS_RADIUS_OF_EARTH;
+	*y = k * cos_lat * sin(lon_rad - ref->lon) * CONSTANTS_RADIUS_OF_EARTH;
 }
 
-__EXPORT void map_projection_reproject(float x, float y, double *lat, double *lon)
+__EXPORT void map_projection_reproject(struct map_projection_reference_s *ref, float x, float y, double *lat, double *lon)
 {
-	/* notation and formulas accoring to: http://mathworld.wolfram.com/AzimuthalEquidistantProjection.html */
-
-	double x_descaled = x / scale;
-	double y_descaled = y / scale;
-
-	double c = sqrt(pow(x_descaled, 2) + pow(y_descaled, 2));
+	double x_rad = x / CONSTANTS_RADIUS_OF_EARTH;
+	double y_rad = y / CONSTANTS_RADIUS_OF_EARTH;
+	double c = sqrtf(x_rad * x_rad + y_rad * y_rad);
 	double sin_c = sin(c);
 	double cos_c = cos(c);
 
-	double lat_sphere = 0;
+	double lat_rad;
+	double lon_rad;
 
-	if (c != 0)
-		lat_sphere = asin(cos_c * sin_phi_1 + (x_descaled * sin_c * cos_phi_1) / c);
-	else
-		lat_sphere = asin(cos_c * sin_phi_1);
-
-//	printf("lat_sphere = %.10f\n",lat_sphere);
-
-	double lon_sphere = 0;
-
-	if (phi_1  == M_PI / 2) {
-		//using small angle approximation (formula in comment is without aproximation)
-		lon_sphere = (lambda_0 - y_descaled / x_descaled); //lon_sphere = (lambda_0 + atan2(-y_descaled, x_descaled));
-
-	} else if (phi_1 == -M_PI / 2) {
-		//using small angle approximation (formula in comment is without aproximation)
-		lon_sphere = (lambda_0 + y_descaled / x_descaled); //lon_sphere = (lambda_0 + atan2(y_descaled, x_descaled));
+	if (c != 0.0) {
+		lat_rad = asin(cos_c * ref->sin_lat + (x_rad * sin_c * ref->cos_lat) / c);
+		lon_rad = (ref->lon + atan2(y_rad * sin_c, c * ref->cos_lat * cos_c - x_rad * ref->sin_lat * sin_c));
 
 	} else {
-
-		lon_sphere = (lambda_0 + atan2(y_descaled * sin_c , c * cos_phi_1 * cos_c - x_descaled * sin_phi_1 * sin_c));
-		//using small angle approximation
-//    	double denominator = (c * cos_phi_1 * cos_c - x_descaled * sin_phi_1 * sin_c);
-//    	if(denominator != 0)
-//    	{
-//    		lon_sphere = (lambda_0 + (y_descaled * sin_c) / denominator);
-//    	}
-//    	else
-//    	{
-//    	...
-//    	}
+		lat_rad = ref->lat;
+		lon_rad = ref->lon;
 	}
 
-//	printf("lon_sphere = %.10f\n",lon_sphere);
-
-	*lat = lat_sphere * 180.0 / M_PI;
-	*lon = lon_sphere * 180.0 / M_PI;
-
+	*lat = lat_rad * 180.0 / M_PI;
+	*lon = lon_rad * 180.0 / M_PI;
 }
 
 
@@ -207,14 +139,13 @@ __EXPORT float get_bearing_to_next_waypoint(double lat_now, double lon_now, doub
 	return theta;
 }
 
-__EXPORT void get_vector_to_next_waypoint(double lat_now, double lon_now, double lat_next, double lon_next, float* v_n, float* v_e)
+__EXPORT void get_vector_to_next_waypoint(double lat_now, double lon_now, double lat_next, double lon_next, float *v_n, float *v_e)
 {
 	double lat_now_rad = lat_now * M_DEG_TO_RAD;
 	double lon_now_rad = lon_now * M_DEG_TO_RAD;
 	double lat_next_rad = lat_next * M_DEG_TO_RAD;
 	double lon_next_rad = lon_next * M_DEG_TO_RAD;
 
-	double d_lat = lat_next_rad - lat_now_rad;
 	double d_lon = lon_next_rad - lon_now_rad;
 
 	/* conscious mix of double and float trig function to maximize speed and efficiency */
@@ -222,7 +153,7 @@ __EXPORT void get_vector_to_next_waypoint(double lat_now, double lon_now, double
 	*v_e = CONSTANTS_RADIUS_OF_EARTH * sin(d_lon) * cos(lat_next_rad);
 }
 
-__EXPORT void get_vector_to_next_waypoint_fast(double lat_now, double lon_now, double lat_next, double lon_next, float* v_n, float* v_e)
+__EXPORT void get_vector_to_next_waypoint_fast(double lat_now, double lon_now, double lat_next, double lon_next, float *v_n, float *v_e)
 {
 	double lat_now_rad = lat_now * M_DEG_TO_RAD;
 	double lon_now_rad = lon_now * M_DEG_TO_RAD;
@@ -242,13 +173,13 @@ __EXPORT void add_vector_to_global_position(double lat_now, double lon_now, floa
 	double lat_now_rad = lat_now * M_DEG_TO_RAD;
 	double lon_now_rad = lon_now * M_DEG_TO_RAD;
 
-	*lat_res = (lat_now_rad + v_n / CONSTANTS_RADIUS_OF_EARTH) * M_RAD_TO_DEG;
-	*lon_res = (lon_now_rad + v_e / (CONSTANTS_RADIUS_OF_EARTH * cos(lat_now_rad))) * M_RAD_TO_DEG;
+	*lat_res = (lat_now_rad + (double)v_n / CONSTANTS_RADIUS_OF_EARTH) * M_RAD_TO_DEG;
+	*lon_res = (lon_now_rad + (double)v_e / (CONSTANTS_RADIUS_OF_EARTH * cos(lat_now_rad))) * M_RAD_TO_DEG;
 }
 
 // Additional functions - @author Doug Weibel <douglas.weibel@colorado.edu>
 
-__EXPORT int get_distance_to_line(struct crosstrack_error_s * crosstrack_error, double lat_now, double lon_now, double lat_start, double lon_start, double lat_end, double lon_end)
+__EXPORT int get_distance_to_line(struct crosstrack_error_s *crosstrack_error, double lat_now, double lon_now, double lat_start, double lon_start, double lat_end, double lon_end)
 {
 // This function returns the distance to the nearest point on the track line.  Distance is positive if current
 // position is right of the track and negative if left of the track as seen from a point on the track line
@@ -265,7 +196,7 @@ __EXPORT int get_distance_to_line(struct crosstrack_error_s * crosstrack_error,
 	crosstrack_error->bearing = 0.0f;
 
 	// Return error if arguments are bad
-	if (lat_now == 0.0d || lon_now == 0.0d || lat_start == 0.0d || lon_start == 0.0d || lat_end == 0.0d || lon_end == 0.0d) return return_value;
+	if (lat_now == 0.0 || lon_now == 0.0 || lat_start == 0.0 || lon_start == 0.0 || lat_end == 0.0d || lon_end == 0.0d) { return return_value; }
 
 	bearing_end = get_bearing_to_next_waypoint(lat_now, lon_now, lat_end, lon_end);
 	bearing_track = get_bearing_to_next_waypoint(lat_start, lon_start, lat_end, lon_end);
@@ -280,7 +211,7 @@ __EXPORT int get_distance_to_line(struct crosstrack_error_s * crosstrack_error,
 	}
 
 	dist_to_end = get_distance_to_next_waypoint(lat_now, lon_now, lat_end, lon_end);
-	crosstrack_error->distance = (dist_to_end) * sin(bearing_diff);
+	crosstrack_error->distance = (dist_to_end) * sinf(bearing_diff);
 
 	if (sin(bearing_diff) >= 0) {
 		crosstrack_error->bearing = _wrap_pi(bearing_track - M_PI_2_F);
@@ -296,8 +227,8 @@ __EXPORT int get_distance_to_line(struct crosstrack_error_s * crosstrack_error,
 }
 
 
-__EXPORT int get_distance_to_arc(struct crosstrack_error_s * crosstrack_error, double lat_now, double lon_now, double lat_center, double lon_center,
-		float radius, float arc_start_bearing, float arc_sweep)
+__EXPORT int get_distance_to_arc(struct crosstrack_error_s *crosstrack_error, double lat_now, double lon_now, double lat_center, double lon_center,
+				 float radius, float arc_start_bearing, float arc_sweep)
 {
 	// This function returns the distance to the nearest point on the track arc.  Distance is positive if current
 	// position is right of the arc and negative if left of the arc as seen from the closest point on the arc and
@@ -316,29 +247,29 @@ __EXPORT int get_distance_to_arc(struct crosstrack_error_s * crosstrack_error, d
 	crosstrack_error->bearing = 0.0f;
 
 	// Return error if arguments are bad
-	if (lat_now == 0.0d || lon_now == 0.0d || lat_center == 0.0d || lon_center == 0.0d || radius == 0.0d) return return_value;
+	if (lat_now == 0.0 || lon_now == 0.0 || lat_center == 0.0 || lon_center == 0.0 || radius == 0.0f) { return return_value; }
 
 
 	if (arc_sweep >= 0) {
 		bearing_sector_start = arc_start_bearing;
 		bearing_sector_end = arc_start_bearing + arc_sweep;
 
-		if (bearing_sector_end > 2.0f * M_PI_F) bearing_sector_end -= M_TWOPI_F;
+		if (bearing_sector_end > 2.0f * M_PI_F) { bearing_sector_end -= M_TWOPI_F; }
 
 	} else {
 		bearing_sector_end = arc_start_bearing;
 		bearing_sector_start = arc_start_bearing - arc_sweep;
 
-		if (bearing_sector_start < 0.0f) bearing_sector_start += M_TWOPI_F;
+		if (bearing_sector_start < 0.0f) { bearing_sector_start += M_TWOPI_F; }
 	}
 
 	in_sector = false;
 
 	// Case where sector does not span zero
-	if (bearing_sector_end >= bearing_sector_start && bearing_now >= bearing_sector_start && bearing_now <= bearing_sector_end) in_sector = true;
+	if (bearing_sector_end >= bearing_sector_start && bearing_now >= bearing_sector_start && bearing_now <= bearing_sector_end) { in_sector = true; }
 
 	// Case where sector does span zero
-	if (bearing_sector_end < bearing_sector_start && (bearing_now > bearing_sector_start || bearing_now < bearing_sector_end)) in_sector = true;
+	if (bearing_sector_end < bearing_sector_start && (bearing_now > bearing_sector_start || bearing_now < bearing_sector_end)) { in_sector = true; }
 
 	// If in the sector then calculate distance and bearing to closest point
 	if (in_sector) {
@@ -364,14 +295,14 @@ __EXPORT int get_distance_to_arc(struct crosstrack_error_s * crosstrack_error, d
 		// as this function generally will not be called repeatedly when we are out of the sector.
 
 		// TO DO - this is messed up and won't compile
-		float start_disp_x = radius * sin(arc_start_bearing);
-		float start_disp_y = radius * cos(arc_start_bearing);
-		float end_disp_x = radius * sin(_wrapPI(arc_start_bearing + arc_sweep));
-		float end_disp_y = radius * cos(_wrapPI(arc_start_bearing + arc_sweep));
-		float lon_start = lon_now + start_disp_x / 111111.0d;
-		float lat_start = lat_now + start_disp_y * cos(lat_now) / 111111.0d;
-		float lon_end = lon_now + end_disp_x / 111111.0d;
-		float lat_end = lat_now + end_disp_y * cos(lat_now) / 111111.0d;
+		float start_disp_x = radius * sinf(arc_start_bearing);
+		float start_disp_y = radius * cosf(arc_start_bearing);
+		float end_disp_x = radius * sinf(_wrapPI(arc_start_bearing + arc_sweep));
+		float end_disp_y = radius * cosf(_wrapPI(arc_start_bearing + arc_sweep));
+		float lon_start = lon_now + start_disp_x / 111111.0f;
+		float lat_start = lat_now + start_disp_y * cosf(lat_now) / 111111.0f;
+		float lon_end = lon_now + end_disp_x / 111111.0f;
+		float lat_end = lat_now + end_disp_y * cosf(lat_now) / 111111.0f;
 		float dist_to_start = get_distance_to_next_waypoint(lat_now, lon_now, lat_start, lon_start);
 		float dist_to_end = get_distance_to_next_waypoint(lat_now, lon_now, lat_end, lon_end);
 
@@ -394,8 +325,8 @@ __EXPORT int get_distance_to_arc(struct crosstrack_error_s * crosstrack_error, d
 }
 
 __EXPORT float get_distance_to_point_global_wgs84(double lat_now, double lon_now, float alt_now,
-	                                          double lat_next, double lon_next, float alt_next,
-	                                          float *dist_xy, float *dist_z)
+		double lat_next, double lon_next, float alt_next,
+		float *dist_xy, float *dist_z)
 {
 	double current_x_rad = lat_next / 180.0 * M_PI;
 	double current_y_rad = lon_next / 180.0 * M_PI;
@@ -405,7 +336,7 @@ __EXPORT float get_distance_to_point_global_wgs84(double lat_now, double lon_now
 	double d_lat = x_rad - current_x_rad;
 	double d_lon = y_rad - current_y_rad;
 
-	double a = sin(d_lat / 2.0) * sin(d_lat / 2.0) + sin(d_lon / 2.0) * sin(d_lon / 2.0f) * cos(current_x_rad) * cos(x_rad);
+	double a = sin(d_lat / 2.0) * sin(d_lat / 2.0) + sin(d_lon / 2.0) * sin(d_lon / 2.0) * cos(current_x_rad) * cos(x_rad);
 	double c = 2 * atan2(sqrt(a), sqrt(1 - a));
 
 	float dxy = CONSTANTS_RADIUS_OF_EARTH * c;
@@ -419,8 +350,8 @@ __EXPORT float get_distance_to_point_global_wgs84(double lat_now, double lon_now
 
 
 __EXPORT float mavlink_wpm_distance_to_point_local(float x_now, float y_now, float z_now,
-	                                           float x_next, float y_next, float z_next,
-	                                           float *dist_xy, float *dist_z)
+		float x_next, float y_next, float z_next,
+		float *dist_xy, float *dist_z)
 {
 	float dx = x_now - x_next;
 	float dy = y_now - y_next;
@@ -442,15 +373,19 @@ __EXPORT float _wrap_pi(float bearing)
 	int c = 0;
 	while (bearing >= M_PI_F) {
 		bearing -= M_TWOPI_F;
-		if (c++ > 3)
+
+		if (c++ > 3) {
 			return NAN;
+		}
 	}
 
 	c = 0;
 	while (bearing < -M_PI_F) {
 		bearing += M_TWOPI_F;
-		if (c++ > 3)
+
+		if (c++ > 3) {
 			return NAN;
+		}
 	}
 
 	return bearing;
@@ -466,15 +401,19 @@ __EXPORT float _wrap_2pi(float bearing)
 	int c = 0;
 	while (bearing >= M_TWOPI_F) {
 		bearing -= M_TWOPI_F;
-		if (c++ > 3)
+
+		if (c++ > 3) {
 			return NAN;
+		}
 	}
 
 	c = 0;
 	while (bearing < 0.0f) {
 		bearing += M_TWOPI_F;
-		if (c++ > 3)
+
+		if (c++ > 3) {
 			return NAN;
+		}
 	}
 
 	return bearing;
@@ -490,15 +429,19 @@ __EXPORT float _wrap_180(float bearing)
 	int c = 0;
 	while (bearing >= 180.0f) {
 		bearing -= 360.0f;
-		if (c++ > 3)
+
+		if (c++ > 3) {
 			return NAN;
+		}
 	}
 
 	c = 0;
 	while (bearing < -180.0f) {
 		bearing += 360.0f;
-		if (c++ > 3)
+
+		if (c++ > 3) {
 			return NAN;
+		}
 	}
 
 	return bearing;
@@ -514,15 +457,19 @@ __EXPORT float _wrap_360(float bearing)
 	int c = 0;
 	while (bearing >= 360.0f) {
 		bearing -= 360.0f;
-		if (c++ > 3)
+
+		if (c++ > 3) {
 			return NAN;
+		}
 	}
 
 	c = 0;
 	while (bearing < 0.0f) {
 		bearing += 360.0f;
-		if (c++ > 3)
+
+		if (c++ > 3) {
 			return NAN;
+		}
 	}
 
 	return bearing;
diff --git a/src/lib/geo/geo.h b/src/lib/geo/geo.h
index 94afb4df0..8b286af36 100644
--- a/src/lib/geo/geo.h
+++ b/src/lib/geo/geo.h
@@ -1,9 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: Thomas Gubler <thomasgubler@student.ethz.ch>
- *           Julian Oes <joes@student.ethz.ch>
- *           Lorenz Meier <lm@inf.ethz.ch>
+ *   Copyright (C) 2012, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -42,6 +39,7 @@
  * @author Thomas Gubler <thomasgubler@student.ethz.ch>
  * @author Julian Oes <joes@student.ethz.ch>
  * @author Lorenz Meier <lm@inf.ethz.ch>
+ * @author Anton Babushkin <anton.babushkin@me.com>
  * Additional functions - @author Doug Weibel <douglas.weibel@colorado.edu>
  */
 
@@ -52,6 +50,8 @@
 
 __BEGIN_DECLS
 
+#include "geo_lookup/geo_mag_declination.h"
+
 #include <stdbool.h>
 
 #define CONSTANTS_ONE_G					9.80665f		/* m/s^2		*/
@@ -67,6 +67,14 @@ struct crosstrack_error_s {
 	float bearing;		// Bearing in radians to closest point on line/arc
 } ;
 
+/* lat/lon are in radians */
+struct map_projection_reference_s {
+	double lat;
+	double lon;
+	double sin_lat;
+	double cos_lat;
+};
+
 /**
  * Initializes the map transformation.
  *
@@ -74,7 +82,7 @@ struct crosstrack_error_s {
  * @param lat in degrees (47.1234567°, not 471234567°)
  * @param lon in degrees (8.1234567°, not 81234567°)
  */
-__EXPORT void map_projection_init(double lat_0, double lon_0);
+__EXPORT void map_projection_init(struct map_projection_reference_s *ref, double lat_0, double lon_0);
 
 /**
  * Transforms a point in the geographic coordinate system to the local azimuthal equidistant plane
@@ -83,7 +91,7 @@ __EXPORT void map_projection_init(double lat_0, double lon_0);
  * @param lat in degrees (47.1234567°, not 471234567°)
  * @param lon in degrees (8.1234567°, not 81234567°)
  */
-__EXPORT void map_projection_project(double lat, double lon, float *x, float *y);
+__EXPORT void map_projection_project(struct map_projection_reference_s *ref, double lat, double lon, float *x, float *y);
 
 /**
  * Transforms a point in the local azimuthal equidistant plane to the geographic coordinate system
@@ -93,7 +101,7 @@ __EXPORT void map_projection_project(double lat, double lon, float *x, float *y)
  * @param lat in degrees (47.1234567°, not 471234567°)
  * @param lon in degrees (8.1234567°, not 81234567°)
  */
-__EXPORT void map_projection_reproject(float x, float y, double *lat, double *lon);
+__EXPORT void map_projection_reproject(struct map_projection_reference_s *ref, float x, float y, double *lat, double *lon);
 
 /**
  * Returns the distance to the next waypoint in meters.
@@ -115,30 +123,30 @@ __EXPORT float get_distance_to_next_waypoint(double lat_now, double lon_now, dou
  */
 __EXPORT float get_bearing_to_next_waypoint(double lat_now, double lon_now, double lat_next, double lon_next);
 
-__EXPORT void get_vector_to_next_waypoint(double lat_now, double lon_now, double lat_next, double lon_next, float* v_n, float* v_e);
+__EXPORT void get_vector_to_next_waypoint(double lat_now, double lon_now, double lat_next, double lon_next, float *v_n, float *v_e);
 
-__EXPORT void get_vector_to_next_waypoint_fast(double lat_now, double lon_now, double lat_next, double lon_next, float* v_n, float* v_e);
+__EXPORT void get_vector_to_next_waypoint_fast(double lat_now, double lon_now, double lat_next, double lon_next, float *v_n, float *v_e);
 
 __EXPORT void add_vector_to_global_position(double lat_now, double lon_now, float v_n, float v_e, double *lat_res, double *lon_res);
 
-__EXPORT int get_distance_to_line(struct crosstrack_error_s * crosstrack_error, double lat_now, double lon_now, double lat_start, double lon_start, double lat_end, double lon_end);
+__EXPORT int get_distance_to_line(struct crosstrack_error_s *crosstrack_error, double lat_now, double lon_now, double lat_start, double lon_start, double lat_end, double lon_end);
 
-__EXPORT int get_distance_to_arc(struct crosstrack_error_s * crosstrack_error, double lat_now, double lon_now, double lat_center, double lon_center,
-		float radius, float arc_start_bearing, float arc_sweep);
+__EXPORT int get_distance_to_arc(struct crosstrack_error_s *crosstrack_error, double lat_now, double lon_now, double lat_center, double lon_center,
+				 float radius, float arc_start_bearing, float arc_sweep);
 
 /*
  * Calculate distance in global frame
  */
 __EXPORT float get_distance_to_point_global_wgs84(double lat_now, double lon_now, float alt_now,
-	                                          double lat_next, double lon_next, float alt_next,
-	                                          float *dist_xy, float *dist_z);
+		double lat_next, double lon_next, float alt_next,
+		float *dist_xy, float *dist_z);
 
 /*
  * Calculate distance in local frame (NED)
  */
 __EXPORT float mavlink_wpm_distance_to_point_local(float x_now, float y_now, float z_now,
-	                                           float x_next, float y_next, float z_next,
-	                                           float *dist_xy, float *dist_z);
+		float x_next, float y_next, float z_next,
+		float *dist_xy, float *dist_z);
 
 __EXPORT float _wrap_180(float bearing);
 __EXPORT float _wrap_360(float bearing);
diff --git a/src/lib/geo/module.mk b/src/lib/geo/module.mk
index 30a2dc99f..d08ca4532 100644
--- a/src/lib/geo/module.mk
+++ b/src/lib/geo/module.mk
@@ -1,6 +1,6 @@
 ############################################################################
 #
-#   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+#   Copyright (c) 2012-2014 PX4 Development Team. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
@@ -35,4 +35,4 @@
 # Geo library
 #
 
-SRCS		 = geo.c
+SRCS		=	geo.c
diff --git a/src/lib/geo_lookup/geo_mag_declination.c b/src/lib/geo_lookup/geo_mag_declination.c
new file mode 100644
index 000000000..c41d52606
--- /dev/null
+++ b/src/lib/geo_lookup/geo_mag_declination.c
@@ -0,0 +1,131 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2014 MAV GEO Library (MAVGEO). All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name MAVGEO nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+* @file geo_mag_declination.c
+*
+* Calculation / lookup table for earth magnetic field declination.
+* 
+* Lookup table from Scott Ferguson <scottfromscott@gmail.com>
+*
+* XXX Lookup table currently too coarse in resolution (only full degrees)
+* and lat/lon res - needs extension medium term.
+*
+*/
+
+#include <geo/geo.h>
+
+/** set this always to the sampling in degrees for the table below */
+#define SAMPLING_RES		10.0f
+#define SAMPLING_MIN_LAT	-60.0f
+#define SAMPLING_MAX_LAT	60.0f
+#define SAMPLING_MIN_LON	-180.0f
+#define SAMPLING_MAX_LON	180.0f
+
+static const int8_t declination_table[13][37] = \
+{
+	{ 46, 45, 44, 42, 41, 40, 38, 36, 33, 28, 23, 16, 10, 4, -1, -5, -9, -14, -19, -26, -33, -40, -48, -55, -61, -66, -71, -74, -75, -72, -61, -25, 22, 40, 45, 47, 46 },
+    { 30, 30, 30, 30, 29, 29, 29, 29, 27, 24, 18, 11, 3, -3, -9, -12, -15, -17, -21, -26, -32, -39, -45, -51, -55, -57, -56, -53, -44, -31, -14, 0, 13, 21, 26, 29, 30 },
+    { 21, 22, 22, 22, 22, 22, 22, 22, 21, 18, 13, 5, -3, -11, -17, -20, -21, -22, -23, -25, -29, -35, -40, -44, -45, -44, -40, -32, -22, -12, -3, 3, 9, 14, 18, 20, 21 },
+    { 16, 17, 17, 17, 17, 17, 16, 16, 16, 13, 8, 0, -9, -16, -21, -24, -25, -25, -23, -20, -21, -24, -28, -31, -31, -29, -24, -17, -9, -3, 0, 4, 7, 10, 13, 15, 16 },
+    { 12, 13, 13, 13, 13, 13, 12, 12, 11, 9, 3, -4, -12, -19, -23, -24, -24, -22, -17, -12, -9, -10, -13, -17, -18, -16, -13, -8, -3, 0, 1, 3, 6, 8, 10, 12, 12 },
+    { 10, 10, 10, 10, 10, 10, 10, 9, 9, 6, 0, -6, -14, -20, -22, -22, -19, -15, -10, -6, -2, -2, -4, -7, -8, -8, -7, -4, 0, 1, 1, 2, 4, 6, 8, 10, 10 },
+    { 9, 9, 9, 9, 9, 9, 8, 8, 7, 4, -1, -8, -15, -19, -20, -18, -14, -9, -5, -2, 0, 1, 0, -2, -3, -4, -3, -2, 0, 0, 0, 1, 3, 5, 7, 8, 9 },
+    { 8, 8, 8, 9, 9, 9, 8, 8, 6, 2, -3, -9, -15, -18, -17, -14, -10, -6, -2, 0, 1, 2, 2, 0, -1, -1, -2, -1, 0, 0, 0, 0, 1, 3, 5, 7, 8 },
+    { 8, 9, 9, 10, 10, 10, 10, 8, 5, 0, -5, -11, -15, -16, -15, -12, -8, -4, -1, 0, 2, 3, 2, 1, 0, 0, 0, 0, 0, -1, -2, -2, -1, 0, 3, 6, 8 },
+    { 6, 9, 10, 11, 12, 12, 11, 9, 5, 0, -7, -12, -15, -15, -13, -10, -7, -3, 0, 1, 2, 3, 3, 3, 2, 1, 0, 0, -1, -3, -4, -5, -5, -2, 0, 3, 6 },
+    { 5, 8, 11, 13, 15, 15, 14, 11, 5, -1, -9, -14, -17, -16, -14, -11, -7, -3, 0, 1, 3, 4, 5, 5, 5, 4, 3, 1, -1, -4, -7, -8, -8, -6, -2, 1, 5 },
+    { 4, 8, 12, 15, 17, 18, 16, 12, 5, -3, -12, -18, -20, -19, -16, -13, -8, -4, -1, 1, 4, 6, 8, 9, 9, 9, 7, 3, -1, -6, -10, -12, -11, -9, -5, 0, 4 },
+    { 3, 9, 14, 17, 20, 21, 19, 14, 4, -8, -19, -25, -26, -25, -21, -17, -12, -7, -2, 1, 5, 9, 13, 15, 16, 16, 13, 7, 0, -7, -12, -15, -14, -11, -6, -1, 3 },
+};
+
+static float get_lookup_table_val(unsigned lat, unsigned lon);
+
+__EXPORT float get_mag_declination(float lat, float lon)
+{
+	/*
+	 * If the values exceed valid ranges, return zero as default
+	 * as we have no way of knowing what the closest real value
+	 * would be.
+	 */
+	if (lat < -90.0f || lat > 90.0f ||
+	    lon < -180.0f || lon > 180.0f) {
+		return 0.0f;
+	}
+
+	/* round down to nearest sampling resolution */
+	int min_lat = (int)(lat / SAMPLING_RES) * SAMPLING_RES;
+	int min_lon = (int)(lon / SAMPLING_RES) * SAMPLING_RES;
+
+	/* for the rare case of hitting the bounds exactly
+	 * the rounding logic wouldn't fit, so enforce it.
+	 */
+
+	/* limit to table bounds - required for maxima even when table spans full globe range */
+	if (lat <= SAMPLING_MIN_LAT) {
+		min_lat = SAMPLING_MIN_LAT;
+	}
+
+	if (lat >= SAMPLING_MAX_LAT) {
+		min_lat = (int)(lat / SAMPLING_RES) * SAMPLING_RES - SAMPLING_RES;
+	}
+
+	if (lon <= SAMPLING_MIN_LON) {
+		min_lon = SAMPLING_MIN_LON;
+	}
+
+	if (lon >= SAMPLING_MAX_LON) {
+		min_lon = (int)(lon / SAMPLING_RES) * SAMPLING_RES - SAMPLING_RES;
+	}
+
+	/* find index of nearest low sampling point */
+	unsigned min_lat_index = (-(SAMPLING_MIN_LAT) + min_lat)  / SAMPLING_RES;
+	unsigned min_lon_index = (-(SAMPLING_MIN_LON) + min_lon) / SAMPLING_RES;
+
+	float declination_sw = get_lookup_table_val(min_lat_index, min_lon_index);
+	float declination_se = get_lookup_table_val(min_lat_index, min_lon_index + 1);
+	float declination_ne = get_lookup_table_val(min_lat_index + 1, min_lon_index + 1);
+	float declination_nw = get_lookup_table_val(min_lat_index + 1, min_lon_index);
+
+	/* perform bilinear interpolation on the four grid corners */
+
+	float declination_min = ((lon - min_lon) / SAMPLING_RES) * (declination_se - declination_sw) + declination_sw;
+	float declination_max = ((lon - min_lon) / SAMPLING_RES) * (declination_ne - declination_nw) + declination_nw;
+
+	return ((lat - min_lat) / SAMPLING_RES) * (declination_max - declination_min) + declination_min;
+}
+
+float get_lookup_table_val(unsigned lat_index, unsigned lon_index)
+{
+	return declination_table[lat_index][lon_index];
+}
\ No newline at end of file
diff --git a/src/lib/geo_lookup/geo_mag_declination.h b/src/lib/geo_lookup/geo_mag_declination.h
new file mode 100644
index 000000000..0ac062d6d
--- /dev/null
+++ b/src/lib/geo_lookup/geo_mag_declination.h
@@ -0,0 +1,47 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2014 MAV GEO Library (MAVGEO). All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name MAVGEO nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+* @file geo_mag_declination.h
+*
+* Calculation / lookup table for earth magnetic field declination.
+*
+*/
+
+#pragma once
+
+__BEGIN_DECLS
+
+__EXPORT float get_mag_declination(float lat, float lon);
+
+__END_DECLS
diff --git a/src/systemcmds/hw_ver/module.mk b/src/lib/geo_lookup/module.mk
index 3cc08b6a1..d7a10df2d 100644
--- a/src/systemcmds/hw_ver/module.mk
+++ b/src/lib/geo_lookup/module.mk
@@ -32,12 +32,9 @@
 ############################################################################
 
 #
-# Show and test hardware version
+# Geo lookup table / data library
 #
 
-MODULE_COMMAND	 = hw_ver
-SRCS		 = hw_ver.c
-
-MODULE_STACKSIZE = 1024
+SRCS		 =	geo_mag_declination.c
 
 MAXOPTIMIZATION	 = -Os
diff --git a/src/lib/launchdetection/CatapultLaunchMethod.cpp b/src/lib/launchdetection/CatapultLaunchMethod.cpp
index 12f80c4a3..c555a0a69 100644
--- a/src/lib/launchdetection/CatapultLaunchMethod.cpp
+++ b/src/lib/launchdetection/CatapultLaunchMethod.cpp
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2013 Estimation and Control Library (ECL). All rights reserved.
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -10,9 +10,9 @@
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
- *    the documentation4 and/or other materials provided with the
+ *    the documentation and/or other materials provided with the
  *    distribution.
- * 3. Neither the name ECL nor the names of its contributors may be
+ * 3. Neither the name PX4 nor the names of its contributors may be
  *    used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
@@ -33,9 +33,10 @@
 
 /**
  * @file CatapultLaunchMethod.cpp
- * Catpult Launch detection
+ * Catapult Launch detection
+ *
+ * @author Thomas Gubler <thomasgubler@gmail.com>
  *
- * Authors and acknowledgements in header.
  */
 
 #include "CatapultLaunchMethod.h"
diff --git a/src/lib/launchdetection/CatapultLaunchMethod.h b/src/lib/launchdetection/CatapultLaunchMethod.h
index 55c46ff3f..23757f6f3 100644
--- a/src/lib/launchdetection/CatapultLaunchMethod.h
+++ b/src/lib/launchdetection/CatapultLaunchMethod.h
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2013 Estimation and Control Library (ECL). All rights reserved.
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -10,9 +10,9 @@
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
- *    the documentation4 and/or other materials provided with the
+ *    the documentation and/or other materials provided with the
  *    distribution.
- * 3. Neither the name ECL nor the names of its contributors may be
+ * 3. Neither the name PX4 nor the names of its contributors may be
  *    used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
diff --git a/src/lib/launchdetection/LaunchDetector.cpp b/src/lib/launchdetection/LaunchDetector.cpp
index bf539701b..3bf47bbb0 100644
--- a/src/lib/launchdetection/LaunchDetector.cpp
+++ b/src/lib/launchdetection/LaunchDetector.cpp
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2013 Estimation and Control Library (ECL). All rights reserved.
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -12,7 +12,7 @@
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
- * 3. Neither the name ECL nor the names of its contributors may be
+ * 3. Neither the name PX4 nor the names of its contributors may be
  *    used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
@@ -30,12 +30,11 @@
  * POSSIBILITY OF SUCH DAMAGE.
  *
  ****************************************************************************/
-
 /**
  * @file launchDetection.cpp
  * Auto Detection for different launch methods (e.g. catapult)
  *
- * Authors and acknowledgements in header.
+ * @author Thomas Gubler <thomasgubler@gmail.com>
  */
 
 #include "LaunchDetector.h"
diff --git a/src/lib/launchdetection/LaunchDetector.h b/src/lib/launchdetection/LaunchDetector.h
index 8066ebab3..1a214b66e 100644
--- a/src/lib/launchdetection/LaunchDetector.h
+++ b/src/lib/launchdetection/LaunchDetector.h
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2013 Estimation and Control Library (ECL). All rights reserved.
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -10,9 +10,9 @@
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
- *    the documentation4 and/or other materials provided with the
+ *    the documentation and/or other materials provided with the
  *    distribution.
- * 3. Neither the name ECL nor the names of its contributors may be
+ * 3. Neither the name PX4 nor the names of its contributors may be
  *    used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
diff --git a/src/lib/launchdetection/LaunchMethod.h b/src/lib/launchdetection/LaunchMethod.h
index 01fa7050e..e04467f6a 100644
--- a/src/lib/launchdetection/LaunchMethod.h
+++ b/src/lib/launchdetection/LaunchMethod.h
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2013 Estimation and Control Library (ECL). All rights reserved.
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -10,9 +10,9 @@
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
- *    the documentation4 and/or other materials provided with the
+ *    the documentation and/or other materials provided with the
  *    distribution.
- * 3. Neither the name ECL nor the names of its contributors may be
+ * 3. Neither the name PX4 nor the names of its contributors may be
  *    used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
diff --git a/src/lib/launchdetection/launchdetection_params.c b/src/lib/launchdetection/launchdetection_params.c
index 45d7957f1..8df8c696c 100644
--- a/src/lib/launchdetection/launchdetection_params.c
+++ b/src/lib/launchdetection/launchdetection_params.c
@@ -1,7 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
- *   Author: Lorenz Meier <lm@inf.ethz.ch>
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -18,7 +17,7 @@
  *    without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
diff --git a/src/lib/launchdetection/module.mk b/src/lib/launchdetection/module.mk
index 13648b74c..d92f0bb45 100644
--- a/src/lib/launchdetection/module.mk
+++ b/src/lib/launchdetection/module.mk
@@ -1,6 +1,6 @@
 ############################################################################
 #
-#   Copyright (c) 2013 Estimation and Control Library (ECL). All rights reserved.
+#   Copyright (c) 2012, 2013, 2014 PX4 Development Team. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
@@ -38,3 +38,5 @@
 SRCS		 = 	LaunchDetector.cpp \
 			CatapultLaunchMethod.cpp \
 			launchdetection_params.c
+
+MAXOPTIMIZATION	 = -Os
diff --git a/src/lib/mathlib/CMSIS/Include/arm_math.h b/src/lib/mathlib/CMSIS/Include/arm_math.h
index 6f66f9ee3..61d3a3b61 100644
--- a/src/lib/mathlib/CMSIS/Include/arm_math.h
+++ b/src/lib/mathlib/CMSIS/Include/arm_math.h
@@ -5193,7 +5193,7 @@ void arm_rfft_fast_f32(
     *pIa = Ialpha;

 

     /* Calculating pIb from Ialpha and Ibeta by equation pIb = -(1/2) * Ialpha + (sqrt(3)/2) * Ibeta */

-    *pIb = -0.5 * Ialpha + (float32_t) 0.8660254039 *Ibeta;

+    *pIb = (float32_t)-0.5 * Ialpha + (float32_t) 0.8660254039 *Ibeta;

 

   }

 

diff --git a/src/lib/mathlib/math/filter/LowPassFilter2p.cpp b/src/lib/mathlib/math/filter/LowPassFilter2p.cpp
index 3699d9bce..6f640c9f9 100644
--- a/src/lib/mathlib/math/filter/LowPassFilter2p.cpp
+++ b/src/lib/mathlib/math/filter/LowPassFilter2p.cpp
@@ -69,7 +69,7 @@ float LowPassFilter2p::apply(float sample)
     // do the filtering
     float delay_element_0 = sample - _delay_element_1 * _a1 - _delay_element_2 * _a2;
     if (isnan(delay_element_0) || isinf(delay_element_0)) {
-        // don't allow bad values to propogate via the filter
+        // don't allow bad values to propagate via the filter
         delay_element_0 = sample;
     }
     float output = delay_element_0 * _b0 + _delay_element_1 * _b1 + _delay_element_2 * _b2;
@@ -81,5 +81,10 @@ float LowPassFilter2p::apply(float sample)
     return output;
 }
 
+float LowPassFilter2p::reset(float sample) {
+    _delay_element_1 = _delay_element_2 = sample;
+    return apply(sample);
+}
+
 } // namespace math
 
diff --git a/src/lib/mathlib/math/filter/LowPassFilter2p.hpp b/src/lib/mathlib/math/filter/LowPassFilter2p.hpp
index 208ec98d4..74cd5d78c 100644
--- a/src/lib/mathlib/math/filter/LowPassFilter2p.hpp
+++ b/src/lib/mathlib/math/filter/LowPassFilter2p.hpp
@@ -52,18 +52,30 @@ public:
         _delay_element_1 = _delay_element_2 = 0;
     }
 
-    // change parameters
+    /**
+     * Change filter parameters
+     */
     void set_cutoff_frequency(float sample_freq, float cutoff_freq);
 
-    // apply - Add a new raw value to the filter 
-    // and retrieve the filtered result
+    /**
+     * Add a new raw value to the filter
+     *
+     * @return retrieve the filtered result
+     */
     float apply(float sample);
 
-    // return the cutoff frequency
+    /**
+     * Return the cutoff frequency
+     */
     float get_cutoff_freq(void) const {
         return _cutoff_freq;
     }
 
+    /**
+     * Reset the filter state to this value
+     */
+    float reset(float sample);
+
 private:
     float           _cutoff_freq; 
     float           _a1;
diff --git a/src/lib/version/version.h b/src/lib/version/version.h
index af733aaf0..d8ccb6774 100644
--- a/src/lib/version/version.h
+++ b/src/lib/version/version.h
@@ -59,4 +59,8 @@
 #define	HW_ARCH "PX4FMU_V2"
 #endif
 
+#ifdef CONFIG_ARCH_BOARD_AEROCORE
+#define	HW_ARCH "AEROCORE"
+#endif
+
 #endif /* VERSION_H_ */
diff --git a/src/modules/att_pos_estimator_ekf/KalmanNav.cpp b/src/modules/att_pos_estimator_ekf/KalmanNav.cpp
deleted file mode 100644
index 668bac5d9..000000000
--- a/src/modules/att_pos_estimator_ekf/KalmanNav.cpp
+++ /dev/null
@@ -1,815 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/**
- * @file KalmanNav.cpp
- *
- * Kalman filter navigation code
- */
-
-#include <poll.h>
-
-#include "KalmanNav.hpp"
-#include <systemlib/err.h>
-#include <geo/geo.h>
-
-// constants
-// Titterton pg. 52
-static const float omega = 7.2921150e-5f; // earth rotation rate, rad/s
-static const float R0 = 6378137.0f; // earth radius, m
-static const float g0 = 9.806f; // standard gravitational accel. m/s^2
-static const int8_t ret_ok = 0; 		// no error in function
-static const int8_t ret_error = -1; 	// error occurred
-
-KalmanNav::KalmanNav(SuperBlock *parent, const char *name) :
-	SuperBlock(parent, name),
-	// subscriptions
-	_sensors(&getSubscriptions(), ORB_ID(sensor_combined), 5), // limit to 200 Hz
-	_gps(&getSubscriptions(), ORB_ID(vehicle_gps_position), 100), // limit to 10 Hz
-	_param_update(&getSubscriptions(), ORB_ID(parameter_update), 1000), // limit to 1 Hz
-	// publications
-	_pos(&getPublications(), ORB_ID(vehicle_global_position)),
-	_localPos(&getPublications(), ORB_ID(vehicle_local_position)),
-	_att(&getPublications(), ORB_ID(vehicle_attitude)),
-	// timestamps
-	_pubTimeStamp(hrt_absolute_time()),
-	_predictTimeStamp(hrt_absolute_time()),
-	_attTimeStamp(hrt_absolute_time()),
-	_outTimeStamp(hrt_absolute_time()),
-	// frame count
-	_navFrames(0),
-	// miss counts
-	_miss(0),
-	// accelerations
-	fN(0), fE(0), fD(0),
-	// state
-	phi(0), theta(0), psi(0),
-	vN(0), vE(0), vD(0),
-	lat(0), lon(0), alt(0),
-	lat0(0), lon0(0), alt0(0),
-	// parameters for ground station
-	_vGyro(this, "V_GYRO"),
-	_vAccel(this, "V_ACCEL"),
-	_rMag(this, "R_MAG"),
-	_rGpsVel(this, "R_GPS_VEL"),
-	_rGpsPos(this, "R_GPS_POS"),
-	_rGpsAlt(this, "R_GPS_ALT"),
-	_rPressAlt(this, "R_PRESS_ALT"),
-	_rAccel(this, "R_ACCEL"),
-	_magDip(this, "ENV_MAG_DIP"),
-	_magDec(this, "ENV_MAG_DEC"),
-	_g(this, "ENV_G"),
-	_faultPos(this, "FAULT_POS"),
-	_faultAtt(this, "FAULT_ATT"),
-	_attitudeInitialized(false),
-	_positionInitialized(false),
-	_attitudeInitCounter(0)
-{
-	using namespace math;
-
-	F.zero();
-	G.zero();
-	V.zero();
-	HAtt.zero();
-	RAtt.zero();
-	HPos.zero();
-	RPos.zero();
-
-	// initial state covariance matrix
-	P0.identity();
-	P0 *= 0.01f;
-	P = P0;
-
-	// initial state
-	phi = 0.0f;
-	theta = 0.0f;
-	psi = 0.0f;
-	vN = 0.0f;
-	vE = 0.0f;
-	vD = 0.0f;
-	lat = 0.0f;
-	lon = 0.0f;
-	alt = 0.0f;
-
-	// initialize rotation quaternion with a single raw sensor measurement
-	_sensors.update();
-	q = init(
-		_sensors.accelerometer_m_s2[0],
-		_sensors.accelerometer_m_s2[1],
-		_sensors.accelerometer_m_s2[2],
-		_sensors.magnetometer_ga[0],
-		_sensors.magnetometer_ga[1],
-		_sensors.magnetometer_ga[2]);
-
-	// initialize dcm
-	C_nb = q.to_dcm();
-
-	// HPos is constant
-	HPos(0, 3) = 1.0f;
-	HPos(1, 4) = 1.0f;
-	HPos(2, 6) = 1.0e7f * M_RAD_TO_DEG_F;
-	HPos(3, 7) = 1.0e7f * M_RAD_TO_DEG_F;
-	HPos(4, 8) = 1.0f;
-	HPos(5, 8) = 1.0f;
-
-	// initialize all parameters
-	updateParams();
-}
-
-math::Quaternion KalmanNav::init(float ax, float ay, float az, float mx, float my, float mz)
-{
-    float initialRoll, initialPitch;
-    float cosRoll, sinRoll, cosPitch, sinPitch;
-    float magX, magY;
-    float initialHdg, cosHeading, sinHeading;
-
-    initialRoll = atan2(-ay, -az);
-    initialPitch = atan2(ax, -az);
-
-    cosRoll = cosf(initialRoll);
-    sinRoll = sinf(initialRoll);
-    cosPitch = cosf(initialPitch);
-    sinPitch = sinf(initialPitch);
-
-    magX = mx * cosPitch + my * sinRoll * sinPitch + mz * cosRoll * sinPitch;
-
-    magY = my * cosRoll - mz * sinRoll;
-
-    initialHdg = atan2f(-magY, magX);
-
-    cosRoll = cosf(initialRoll * 0.5f);
-    sinRoll = sinf(initialRoll * 0.5f);
-
-    cosPitch = cosf(initialPitch * 0.5f);
-    sinPitch = sinf(initialPitch * 0.5f);
-
-    cosHeading = cosf(initialHdg * 0.5f);
-    sinHeading = sinf(initialHdg * 0.5f);
-
-    float q0 = cosRoll * cosPitch * cosHeading + sinRoll * sinPitch * sinHeading;
-    float q1 = sinRoll * cosPitch * cosHeading - cosRoll * sinPitch * sinHeading;
-    float q2 = cosRoll * sinPitch * cosHeading + sinRoll * cosPitch * sinHeading;
-    float q3 = cosRoll * cosPitch * sinHeading - sinRoll * sinPitch * cosHeading;
-
-    return math::Quaternion(q0, q1, q2, q3);
-
-}
-
-void KalmanNav::update()
-{
-	using namespace math;
-
-	struct pollfd fds[1];
-	fds[0].fd = _sensors.getHandle();
-	fds[0].events = POLLIN;
-
-	// poll for new data
-	int ret = poll(fds, 1, 1000);
-
-	if (ret < 0) {
-		// XXX this is seriously bad - should be an emergency
-		return;
-
-	} else if (ret == 0) { // timeout
-		return;
-	}
-
-	// get new timestamp
-	uint64_t newTimeStamp = hrt_absolute_time();
-
-	// check updated subscriptions
-	if (_param_update.updated()) updateParams();
-
-	bool gpsUpdate = _gps.updated();
-	bool sensorsUpdate = _sensors.updated();
-
-	// get new information from subscriptions
-	// this clears update flag
-	updateSubscriptions();
-
-	// initialize attitude when sensors online
-	if (!_attitudeInitialized && sensorsUpdate) {
-		if (correctAtt() == ret_ok) _attitudeInitCounter++;
-
-		if (_attitudeInitCounter > 100) {
-			warnx("initialized EKF attitude");
-			warnx("phi: %8.4f, theta: %8.4f, psi: %8.4f",
-			       double(phi), double(theta), double(psi));
-			_attitudeInitialized = true;
-		}
-	}
-
-	// initialize position when gps received
-	if (!_positionInitialized &&
-	    _attitudeInitialized && // wait for attitude first
-	    gpsUpdate &&
-	    _gps.fix_type > 2
-	    //&& _gps.counter_pos_valid > 10
-	   ) {
-		vN = _gps.vel_n_m_s;
-		vE = _gps.vel_e_m_s;
-		vD = _gps.vel_d_m_s;
-		setLatDegE7(_gps.lat);
-		setLonDegE7(_gps.lon);
-		setAltE3(_gps.alt);
-		// set reference position for
-		// local position
-		lat0 = lat;
-		lon0 = lon;
-		alt0 = alt;
-		// XXX map_projection has internal global
-		// states that multiple things could change, 
-		// should make map_projection take reference
-		// lat/lon and not have init
-		map_projection_init(lat0, lon0);
-		_positionInitialized = true;
-		warnx("initialized EKF state with GPS");
-		warnx("vN: %8.4f, vE: %8.4f, vD: %8.4f, lat: %8.4f, lon: %8.4f, alt: %8.4f",
-		       double(vN), double(vE), double(vD),
-		       lat, lon, double(alt));
-	}
-
-	// prediction step
-	// using sensors timestamp so we can account for packet lag
-	float dt = (_sensors.timestamp - _predictTimeStamp) / 1.0e6f;
-	//printf("dt: %15.10f\n", double(dt));
-	_predictTimeStamp = _sensors.timestamp;
-
-	// don't predict if time greater than a second
-	if (dt < 1.0f) {
-		predictState(dt);
-		predictStateCovariance(dt);
-		// count fast frames
-		_navFrames += 1;
-	}
-
-	// count times 100 Hz rate isn't met
-	if (dt > 0.01f) _miss++;
-
-	// gps correction step
-	if (_positionInitialized && gpsUpdate) {
-		correctPos();
-	}
-
-	// attitude correction step
-	if (_attitudeInitialized 								// initialized
-	    && sensorsUpdate 								// new data
-	    && _sensors.timestamp - _attTimeStamp > 1e6 / 50 	// 50 Hz
-	   ) {
-		_attTimeStamp = _sensors.timestamp;
-		correctAtt();
-	}
-
-	// publication
-	if (newTimeStamp - _pubTimeStamp > 1e6 / 50) { // 50 Hz
-		_pubTimeStamp = newTimeStamp;
-
-		updatePublications();
-	}
-
-	// output
-	if (newTimeStamp - _outTimeStamp > 10e6) { // 0.1 Hz
-		_outTimeStamp = newTimeStamp;
-		//printf("nav: %4d Hz, miss #: %4d\n",
-		//       _navFrames / 10, _miss / 10);
-		_navFrames = 0;
-		_miss = 0;
-	}
-}
-
-void KalmanNav::updatePublications()
-{
-	using namespace math;
-
-	// global position publication
-	_pos.timestamp = _pubTimeStamp;
-	_pos.time_gps_usec = _gps.timestamp_position;
-	_pos.global_valid = true;
-	_pos.lat = lat * M_RAD_TO_DEG;
-	_pos.lon = lon * M_RAD_TO_DEG;
-	_pos.alt = float(alt);
-	_pos.vel_n = vN;
-	_pos.vel_e = vE;
-	_pos.vel_d = vD;
-	_pos.yaw = psi;
-
-	// local position publication
-	float x;
-	float y;
-	bool landed = alt < (alt0 + 0.1); // XXX improve?
-	map_projection_project(lat, lon, &x, &y); 
-	_localPos.timestamp = _pubTimeStamp;
-	_localPos.xy_valid = true;
-	_localPos.z_valid = true;
-	_localPos.v_xy_valid = true;
-	_localPos.v_z_valid = true;
-	_localPos.x = x;
-	_localPos.y = y;
-	_localPos.z = alt0 - alt;
-	_localPos.vx = vN;
-	_localPos.vy = vE;
-	_localPos.vz = vD;
-	_localPos.yaw = psi;
-	_localPos.xy_global = true;
-	_localPos.z_global = true;
-	_localPos.ref_timestamp = _pubTimeStamp;
-	_localPos.ref_lat = getLatDegE7();
-	_localPos.ref_lon = getLonDegE7();
-	_localPos.ref_alt = 0;
-	_localPos.landed = landed;
-
-	// attitude publication
-	_att.timestamp = _pubTimeStamp;
-	_att.roll = phi;
-	_att.pitch = theta;
-	_att.yaw = psi;
-	_att.rollspeed = _sensors.gyro_rad_s[0];
-	_att.pitchspeed = _sensors.gyro_rad_s[1];
-	_att.yawspeed = _sensors.gyro_rad_s[2];
-	// TODO, add gyro offsets to filter
-	_att.rate_offsets[0] = 0.0f;
-	_att.rate_offsets[1] = 0.0f;
-	_att.rate_offsets[2] = 0.0f;
-
-	for (int i = 0; i < 3; i++) for (int j = 0; j < 3; j++)
-			_att.R[i][j] = C_nb(i, j);
-
-	for (int i = 0; i < 4; i++) _att.q[i] = q(i);
-
-	_att.R_valid = true;
-	_att.q_valid = true;
-
-	// selectively update publications,
-	// do NOT call superblock do-all method
-	if (_positionInitialized) {
-		_pos.update();
-		_localPos.update();
-	}
-
-	if (_attitudeInitialized)
-		_att.update();
-}
-
-int KalmanNav::predictState(float dt)
-{
-	using namespace math;
-
-	// trig
-	float sinL = sinf(lat);
-	float cosL = cosf(lat);
-	float cosLSing = cosf(lat);
-
-	// prevent singularity
-	if (fabsf(cosLSing) < 0.01f) {
-		if (cosLSing > 0) cosLSing = 0.01;
-		else cosLSing = -0.01;
-	}
-
-	// attitude prediction
-	if (_attitudeInitialized) {
-		Vector<3> w(_sensors.gyro_rad_s);
-
-		// attitude
-		q = q + q.derivative(w) * dt;
-
-		// renormalize quaternion if needed
-		if (fabsf(q.length() - 1.0f) > 1e-4f) {
-			q.normalize();
-		}
-
-		// C_nb update
-		C_nb = q.to_dcm();
-
-		// euler update
-		Vector<3> euler = C_nb.to_euler();
-		phi = euler.data[0];
-		theta = euler.data[1];
-		psi = euler.data[2];
-
-		// specific acceleration in nav frame
-		Vector<3> accelB(_sensors.accelerometer_m_s2);
-		Vector<3> accelN = C_nb * accelB;
-		fN = accelN(0);
-		fE = accelN(1);
-		fD = accelN(2);
-	}
-
-	// position prediction
-	if (_positionInitialized) {
-		// neglects angular deflections in local gravity
-		// see Titerton pg. 70
-		float R = R0 + float(alt);
-		float LDot = vN / R;
-		float lDot = vE / (cosLSing * R);
-		float rotRate = 2 * omega + lDot;
-
-		// XXX position prediction using speed
-		float vNDot = fN - vE * rotRate * sinL +
-			      vD * LDot;
-		float vDDot = fD - vE * rotRate * cosL -
-			      vN * LDot + _g.get();
-		float vEDot = fE + vN * rotRate * sinL +
-			      vDDot * rotRate * cosL;
-
-		// rectangular integration
-		vN += vNDot * dt;
-		vE += vEDot * dt;
-		vD += vDDot * dt;
-		lat += double(LDot * dt);
-		lon += double(lDot * dt);
-		alt += double(-vD * dt);
-	}
-
-	return ret_ok;
-}
-
-int KalmanNav::predictStateCovariance(float dt)
-{
-	using namespace math;
-
-	// trig
-	float sinL = sinf(lat);
-	float cosL = cosf(lat);
-	float cosLSq = cosL * cosL;
-	float tanL = tanf(lat);
-
-	// prepare for matrix
-	float R = R0 + float(alt);
-	float RSq = R * R;
-
-	// F Matrix
-	// Titterton pg. 291
-
-	F(0, 1) = -(omega * sinL + vE * tanL / R);
-	F(0, 2) = vN / R;
-	F(0, 4) = 1.0f / R;
-	F(0, 6) = -omega * sinL;
-	F(0, 8) = -vE / RSq;
-
-	F(1, 0) = omega * sinL + vE * tanL / R;
-	F(1, 2) = omega * cosL + vE / R;
-	F(1, 3) = -1.0f / R;
-	F(1, 8) = vN / RSq;
-
-	F(2, 0) = -vN / R;
-	F(2, 1) = -omega * cosL - vE / R;
-	F(2, 4) = -tanL / R;
-	F(2, 6) = -omega * cosL - vE / (R * cosLSq);
-	F(2, 8) = vE * tanL / RSq;
-
-	F(3, 1) = -fD;
-	F(3, 2) = fE;
-	F(3, 3) = vD / R;
-	F(3, 4) = -2 * (omega * sinL + vE * tanL / R);
-	F(3, 5) = vN / R;
-	F(3, 6) = -vE * (2 * omega * cosL + vE / (R * cosLSq));
-	F(3, 8) = (vE * vE * tanL - vN * vD) / RSq;
-
-	F(4, 0) = fD;
-	F(4, 2) = -fN;
-	F(4, 3) = 2 * omega * sinL + vE * tanL / R;
-	F(4, 4) = (vN * tanL + vD) / R;
-	F(4, 5) = 2 * omega * cosL + vE / R;
-	F(4, 6) = 2 * omega * (vN * cosL - vD * sinL) +
-		  vN * vE / (R * cosLSq);
-	F(4, 8) = -vE * (vN * tanL + vD) / RSq;
-
-	F(5, 0) = -fE;
-	F(5, 1) = fN;
-	F(5, 3) = -2 * vN / R;
-	F(5, 4) = -2 * (omega * cosL + vE / R);
-	F(5, 6) = 2 * omega * vE * sinL;
-	F(5, 8) = (vN * vN + vE * vE) / RSq;
-
-	F(6, 3) = 1 / R;
-	F(6, 8) = -vN / RSq;
-
-	F(7, 4) = 1 / (R * cosL);
-	F(7, 6) = vE * tanL / (R * cosL);
-	F(7, 8) = -vE / (cosL * RSq);
-
-	F(8, 5) = -1;
-
-	// G Matrix
-	// Titterton pg. 291
-	G(0, 0) = -C_nb(0, 0);
-	G(0, 1) = -C_nb(0, 1);
-	G(0, 2) = -C_nb(0, 2);
-	G(1, 0) = -C_nb(1, 0);
-	G(1, 1) = -C_nb(1, 1);
-	G(1, 2) = -C_nb(1, 2);
-	G(2, 0) = -C_nb(2, 0);
-	G(2, 1) = -C_nb(2, 1);
-	G(2, 2) = -C_nb(2, 2);
-
-	G(3, 3) = C_nb(0, 0);
-	G(3, 4) = C_nb(0, 1);
-	G(3, 5) = C_nb(0, 2);
-	G(4, 3) = C_nb(1, 0);
-	G(4, 4) = C_nb(1, 1);
-	G(4, 5) = C_nb(1, 2);
-	G(5, 3) = C_nb(2, 0);
-	G(5, 4) = C_nb(2, 1);
-	G(5, 5) = C_nb(2, 2);
-
-	// continuous prediction equations
-	// for discrete time EKF
-	// http://en.wikipedia.org/wiki/Extended_Kalman_filter
-	P = P + (F * P + P * F.transposed() + G * V * G.transposed()) * dt;
-
-	return ret_ok;
-}
-
-int KalmanNav::correctAtt()
-{
-	using namespace math;
-
-	// trig
-	float cosPhi = cosf(phi);
-	float cosTheta = cosf(theta);
-	// float cosPsi = cosf(psi);
-	float sinPhi = sinf(phi);
-	float sinTheta = sinf(theta);
-	// float sinPsi = sinf(psi);
-
-	// mag predicted measurement
-	// choosing some typical magnetic field properties,
-	//  TODO dip/dec depend on lat/ lon/ time
-	//float dip = _magDip.get() / M_RAD_TO_DEG_F; // dip, inclination with level
-	float dec = _magDec.get() / M_RAD_TO_DEG_F; // declination, clockwise rotation from north
-
-	// compensate roll and pitch, but not yaw
-	// XXX take the vectors out of the C_nb matrix to avoid singularities
-	math::Matrix<3,3> C_rp;
-	C_rp.from_euler(phi, theta, 0.0f);//C_nb.transposed();
-
-	// mag measurement
-	Vector<3> magBody(_sensors.magnetometer_ga);
-
-	// transform to earth frame
-	Vector<3> magNav = C_rp * magBody;
-
-	// calculate error between estimate and measurement
-	// apply declination correction for true heading as well.
-	float yMag = -atan2f(magNav(1),magNav(0)) - psi - dec;
-	if (yMag > M_PI_F) yMag -= 2*M_PI_F;
-	if (yMag < -M_PI_F) yMag += 2*M_PI_F;
-
-	// accel measurement
-	Vector<3> zAccel(_sensors.accelerometer_m_s2);
-	float accelMag = zAccel.length();
-	zAccel.normalize();
-
-	// ignore accel correction when accel mag not close to g
-	Matrix<4,4> RAttAdjust = RAtt;
-
-	bool ignoreAccel = fabsf(accelMag - _g.get()) > 1.1f;
-
-	if (ignoreAccel) {
-		RAttAdjust(1, 1) = 1.0e10;
-		RAttAdjust(2, 2) = 1.0e10;
-		RAttAdjust(3, 3) = 1.0e10;
-
-	} else {
-		//printf("correcting attitude with accel\n");
-	}
-
-	// accel predicted measurement
-	Vector<3> zAccelHat = (C_nb.transposed() * Vector<3>(0, 0, -_g.get())).normalized();
-
-	// calculate residual
-	Vector<4> y(yMag, zAccel(0) - zAccelHat(0), zAccel(1) - zAccelHat(1), zAccel(2) - zAccelHat(2));
-
-	// HMag
-	HAtt(0, 2) = 1;
-
-	// HAccel
-	HAtt(1, 1) = cosTheta;
-	HAtt(2, 0) = -cosPhi * cosTheta;
-	HAtt(2, 1) = sinPhi * sinTheta;
-	HAtt(3, 0) = sinPhi * cosTheta;
-	HAtt(3, 1) = cosPhi * sinTheta;
-
-	// compute correction
-	// http://en.wikipedia.org/wiki/Extended_Kalman_filter
-	Matrix<4, 4> S = HAtt * P * HAtt.transposed() + RAttAdjust; // residual covariance
-	Matrix<9, 4> K = P * HAtt.transposed() * S.inversed();
-	Vector<9> xCorrect = K * y;
-
-	// check correciton is sane
-	for (size_t i = 0; i < xCorrect.get_size(); i++) {
-		float val = xCorrect(i);
-
-		if (isnan(val) || isinf(val)) {
-			// abort correction and return
-			warnx("numerical failure in att correction");
-			// reset P matrix to P0
-			P = P0;
-			return ret_error;
-		}
-	}
-
-	// correct state
-	if (!ignoreAccel) {
-		phi += xCorrect(PHI);
-		theta += xCorrect(THETA);
-	}
-
-	psi += xCorrect(PSI);
-
-	// attitude also affects nav velocities
-	if (_positionInitialized) {
-		vN += xCorrect(VN);
-		vE += xCorrect(VE);
-		vD += xCorrect(VD);
-	}
-
-	// update state covariance
-	// http://en.wikipedia.org/wiki/Extended_Kalman_filter
-	P = P - K * HAtt * P;
-
-	// fault detection
-	float beta = y * (S.inversed() * y);
-
-	if (beta > _faultAtt.get()) {
-		warnx("fault in attitude: beta = %8.4f", (double)beta);
-		warnx("y:"); y.print();
-	}
-
-	// update quaternions from euler
-	// angle correction
-	q.from_euler(phi, theta, psi);
-
-	return ret_ok;
-}
-
-int KalmanNav::correctPos()
-{
-	using namespace math;
-
-	// residual
-	Vector<6> y;
-	y(0) = _gps.vel_n_m_s - vN;
-	y(1) = _gps.vel_e_m_s - vE;
-	y(2) = double(_gps.lat) - double(lat) * 1.0e7 * M_RAD_TO_DEG;
-	y(3) = double(_gps.lon) - double(lon) * 1.0e7 * M_RAD_TO_DEG;
-	y(4) = _gps.alt / 1.0e3f - alt;
-	y(5) = _sensors.baro_alt_meter - alt;
-
-	// compute correction
-	// http://en.wikipedia.org/wiki/Extended_Kalman_filter
-	Matrix<6,6> S = HPos * P * HPos.transposed() + RPos; // residual covariance
-	Matrix<9,6> K = P * HPos.transposed() * S.inversed();
-	Vector<9> xCorrect = K * y;
-
-	// check correction is sane
-	for (size_t i = 0; i < xCorrect.get_size(); i++) {
-		float val = xCorrect(i);
-
-		if (!isfinite(val)) {
-			// abort correction and return
-			warnx("numerical failure in gps correction");
-			// fallback to GPS
-			vN = _gps.vel_n_m_s;
-			vE = _gps.vel_e_m_s;
-			vD = _gps.vel_d_m_s;
-			setLatDegE7(_gps.lat);
-			setLonDegE7(_gps.lon);
-			setAltE3(_gps.alt);
-			// reset P matrix to P0
-			P = P0;
-			return ret_error;
-		}
-	}
-
-	// correct state
-	vN += xCorrect(VN);
-	vE += xCorrect(VE);
-	vD += xCorrect(VD);
-	lat += double(xCorrect(LAT));
-	lon += double(xCorrect(LON));
-	alt += xCorrect(ALT);
-
-	// update state covariance
-	// http://en.wikipedia.org/wiki/Extended_Kalman_filter
-	P = P - K * HPos * P;
-
-	// fault detetcion
-	float beta = y * (S.inversed() * y);
-
-	static int counter = 0;
-	if (beta > _faultPos.get() && (counter % 10 == 0)) {
-		warnx("fault in gps: beta = %8.4f", (double)beta);
-		warnx("Y/N: vN: %8.4f, vE: %8.4f, lat: %8.4f, lon: %8.4f, alt: %8.4f, baro: %8.4f",
-		       double(y(0) / sqrtf(RPos(0, 0))),
-		       double(y(1) / sqrtf(RPos(1, 1))),
-		       double(y(2) / sqrtf(RPos(2, 2))),
-		       double(y(3) / sqrtf(RPos(3, 3))),
-		       double(y(4) / sqrtf(RPos(4, 4))),
-		       double(y(5) / sqrtf(RPos(5, 5))));
-	}
-	counter++;
-
-	return ret_ok;
-}
-
-void KalmanNav::updateParams()
-{
-	using namespace math;
-	using namespace control;
-	SuperBlock::updateParams();
-
-	// gyro noise
-	V(0, 0) = _vGyro.get();   // gyro x, rad/s
-	V(1, 1) = _vGyro.get();   // gyro y
-	V(2, 2) = _vGyro.get();   // gyro z
-
-	// accel noise
-	V(3, 3) = _vAccel.get();   // accel x, m/s^2
-	V(4, 4) = _vAccel.get();   // accel y
-	V(5, 5) = _vAccel.get();   // accel z
-
-	// magnetometer noise
-	float noiseMin = 1e-6f;
-	float noiseMagSq = _rMag.get() * _rMag.get();
-
-	if (noiseMagSq < noiseMin) noiseMagSq = noiseMin;
-
-	RAtt(0, 0) = noiseMagSq; // normalized direction
-
-	// accelerometer noise
-	float noiseAccelSq = _rAccel.get() * _rAccel.get();
-
-	// bound noise to prevent singularities
-	if (noiseAccelSq < noiseMin) noiseAccelSq = noiseMin;
-
-	RAtt(1, 1) = noiseAccelSq; // normalized direction
-	RAtt(2, 2) = noiseAccelSq;
-	RAtt(3, 3) = noiseAccelSq;
-
-	// gps noise
-	float R = R0 + float(alt);
-	float cosLSing = cosf(lat);
-
-	// prevent singularity
-	if (fabsf(cosLSing) < 0.01f) {
-		if (cosLSing > 0) cosLSing = 0.01;
-		else cosLSing = -0.01;
-	}
-
-	float noiseVel = _rGpsVel.get();
-	float noiseLatDegE7 = 1.0e7f * M_RAD_TO_DEG_F * _rGpsPos.get() / R;
-	float noiseLonDegE7 = noiseLatDegE7 / cosLSing;
-	float noiseGpsAlt = _rGpsAlt.get();
-	float noisePressAlt = _rPressAlt.get();
-
-	// bound noise to prevent singularities
-	if (noiseVel < noiseMin) noiseVel = noiseMin;
-
-	if (noiseLatDegE7 < noiseMin) noiseLatDegE7 = noiseMin;
-
-	if (noiseLonDegE7 < noiseMin) noiseLonDegE7 = noiseMin;
-
-	if (noiseGpsAlt < noiseMin) noiseGpsAlt = noiseMin;
-
-	if (noisePressAlt < noiseMin) noisePressAlt = noiseMin;
-
-	RPos(0, 0) = noiseVel * noiseVel; // vn
-	RPos(1, 1) = noiseVel * noiseVel; // ve
-	RPos(2, 2) = noiseLatDegE7 * noiseLatDegE7; // lat
-	RPos(3, 3) = noiseLonDegE7 * noiseLonDegE7; // lon
-	RPos(4, 4) = noiseGpsAlt * noiseGpsAlt; // h
-	RPos(5, 5) = noisePressAlt * noisePressAlt; // h
-	// XXX, note that RPos depends on lat, so updateParams should
-	// be called if lat changes significantly
-}
diff --git a/src/modules/att_pos_estimator_ekf/KalmanNav.hpp b/src/modules/att_pos_estimator_ekf/KalmanNav.hpp
deleted file mode 100644
index caf93bc78..000000000
--- a/src/modules/att_pos_estimator_ekf/KalmanNav.hpp
+++ /dev/null
@@ -1,192 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/**
- * @file KalmanNav.hpp
- *
- * kalman filter navigation code
- */
-
-#pragma once
-
-//#define MATRIX_ASSERT
-//#define VECTOR_ASSERT
-
-#include <nuttx/config.h>
-
-#include <mathlib/mathlib.h>
-#include <controllib/blocks.hpp>
-#include <controllib/block/BlockParam.hpp>
-#include <uORB/Subscription.hpp>
-#include <uORB/Publication.hpp>
-
-#include <uORB/topics/vehicle_attitude.h>
-#include <uORB/topics/vehicle_global_position.h>
-#include <uORB/topics/vehicle_local_position.h>
-#include <uORB/topics/sensor_combined.h>
-#include <uORB/topics/vehicle_gps_position.h>
-#include <uORB/topics/parameter_update.h>
-
-#include <drivers/drv_accel.h>
-#include <drivers/drv_gyro.h>
-#include <drivers/drv_mag.h>
-
-#include <drivers/drv_hrt.h>
-#include <poll.h>
-#include <unistd.h>
-
-/**
- * Kalman filter navigation class
- * http://en.wikipedia.org/wiki/Extended_Kalman_filter
- * Discrete-time extended Kalman filter
- */
-class KalmanNav : public control::SuperBlock
-{
-public:
-	/**
-	 * Constructor
-	 */
-	KalmanNav(SuperBlock *parent, const char *name);
-
-	/**
-	 * Deconstuctor
-	 */
-
-	virtual ~KalmanNav() {};
-
-	math::Quaternion init(float ax, float ay, float az, float mx, float my, float mz);
-
-	/**
-	 * The main callback function for the class
-	 */
-	void update();
-
-
-	/**
-	 * Publication update
-	 */
-	virtual void updatePublications();
-
-	/**
-	 * State prediction
-	 * Continuous, non-linear
-	 */
-	int predictState(float dt);
-
-	/**
-	 * State covariance prediction
-	 * Continuous, linear
-	 */
-	int predictStateCovariance(float dt);
-
-	/**
-	 * Attitude correction
-	 */
-	int correctAtt();
-
-	/**
-	 * Position correction
-	 */
-	int correctPos();
-
-	/**
-	 * Overloaded update parameters
-	 */
-	virtual void updateParams();
-protected:
-	// kalman filter
-	math::Matrix<9,9> F;             /**< Jacobian(f,x), where dx/dt = f(x,u) */
-	math::Matrix<9,6> G;             /**< noise shaping matrix for gyro/accel */
-	math::Matrix<9,9> P;             /**< state covariance matrix */
-	math::Matrix<9,9> P0;            /**< initial state covariance matrix */
-	math::Matrix<6,6> V;             /**< gyro/ accel noise matrix */
-	math::Matrix<4,9> HAtt;          /**< attitude measurement matrix */
-	math::Matrix<4,4> RAtt;          /**< attitude measurement noise matrix */
-	math::Matrix<6,9> HPos;          /**< position measurement jacobian matrix */
-	math::Matrix<6,6> RPos;          /**< position measurement noise matrix */
-	// attitude
-	math::Matrix<3,3> C_nb;             /**< direction cosine matrix from body to nav frame */
-	math::Quaternion q;         /**< quaternion from body to nav frame */
-	// subscriptions
-	uORB::Subscription<sensor_combined_s> _sensors;          /**< sensors sub. */
-	uORB::Subscription<vehicle_gps_position_s> _gps;         /**< gps sub. */
-	uORB::Subscription<parameter_update_s> _param_update;    /**< parameter update sub. */
-	// publications
-	uORB::Publication<vehicle_global_position_s> _pos;       /**< position pub. */
-	uORB::Publication<vehicle_local_position_s> _localPos;   /**< local position pub. */
-	uORB::Publication<vehicle_attitude_s> _att;              /**< attitude pub. */
-	// time stamps
-	uint64_t _pubTimeStamp;     /**< output data publication time stamp */
-	uint64_t _predictTimeStamp; /**< prediction time stamp */
-	uint64_t _attTimeStamp;     /**< attitude correction time stamp */
-	uint64_t _outTimeStamp;     /**< output time stamp */
-	// frame count
-	uint16_t _navFrames;        /**< navigation frames completed in output cycle */
-	// miss counts
-	uint16_t _miss;         	/**< number of times fast prediction loop missed */
-	// accelerations
-	float fN, fE, fD;           /**< navigation frame acceleration */
-	// states
-	enum {PHI = 0, THETA, PSI, VN, VE, VD, LAT, LON, ALT};  /**< state enumeration */
-	float phi, theta, psi;                  /**< 3-2-1 euler angles */
-	float vN, vE, vD;                       /**< navigation velocity, m/s */
-	double lat, lon;                   	/**< lat, lon radians */
-	// parameters
-	float alt;                   		/**< altitude, meters */
-	double lat0, lon0;                   	/**< reference latitude and longitude */
-	float alt0;                   		/**<  refeerence altitude (ground height) */
-	control::BlockParamFloat _vGyro;      /**< gyro process noise */
-	control::BlockParamFloat _vAccel;     /**< accelerometer process noise  */
-	control::BlockParamFloat _rMag;       /**< magnetometer measurement noise  */
-	control::BlockParamFloat _rGpsVel;    /**< gps velocity measurement noise */
-	control::BlockParamFloat _rGpsPos;    /**< gps position measurement noise */
-	control::BlockParamFloat _rGpsAlt;    /**< gps altitude measurement noise */
-	control::BlockParamFloat _rPressAlt;  /**< press altitude measurement noise */
-	control::BlockParamFloat _rAccel;     /**< accelerometer measurement noise */
-	control::BlockParamFloat _magDip;     /**< magnetic inclination with level */
-	control::BlockParamFloat _magDec;     /**< magnetic declination, clockwise rotation */
-	control::BlockParamFloat _g;          /**< gravitational constant */
-	control::BlockParamFloat _faultPos;   /**< fault detection threshold for position */
-	control::BlockParamFloat _faultAtt;   /**< fault detection threshold for attitude */
-	// status
-	bool _attitudeInitialized;
-	bool _positionInitialized;
-	uint16_t _attitudeInitCounter;
-	// accessors
-	int32_t getLatDegE7() { return int32_t(lat * 1.0e7 * M_RAD_TO_DEG); }
-	void setLatDegE7(int32_t val) { lat = val / 1.0e7 / M_RAD_TO_DEG; }
-	int32_t getLonDegE7() { return int32_t(lon * 1.0e7 * M_RAD_TO_DEG); }
-	void setLonDegE7(int32_t val) { lon = val / 1.0e7 / M_RAD_TO_DEG; }
-	int32_t getAltE3() { return int32_t(alt * 1.0e3); }
-	void setAltE3(int32_t val) { alt = double(val) / 1.0e3; }
-};
diff --git a/src/modules/att_pos_estimator_ekf/kalman_main.cpp b/src/modules/att_pos_estimator_ekf/kalman_main.cpp
deleted file mode 100644
index 3d20d4d2d..000000000
--- a/src/modules/att_pos_estimator_ekf/kalman_main.cpp
+++ /dev/null
@@ -1,157 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved.
- *   Author: 	James Goppert
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/**
- * @file kalman_main.cpp
- * Combined attitude / position estimator.
- *
- * @author James Goppert
- */
-
-#include <nuttx/config.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <systemlib/systemlib.h>
-#include <systemlib/param/param.h>
-#include <systemlib/err.h>
-#include <drivers/drv_hrt.h>
-#include <math.h>
-#include "KalmanNav.hpp"
-
-static bool thread_should_exit = false;     /**< Deamon exit flag */
-static bool thread_running = false;     /**< Deamon status flag */
-static int daemon_task;             /**< Handle of deamon task / thread */
-
-/**
- * Deamon management function.
- */
-extern "C" __EXPORT int att_pos_estimator_ekf_main(int argc, char *argv[]);
-
-/**
- * Mainloop of deamon.
- */
-int kalman_demo_thread_main(int argc, char *argv[]);
-
-/**
- * Print the correct usage.
- */
-static void usage(const char *reason);
-
-static void
-usage(const char *reason)
-{
-	if (reason)
-		fprintf(stderr, "%s\n", reason);
-
-	warnx("usage: att_pos_estimator_ekf {start|stop|status} [-p <additional params>]");
-	exit(1);
-}
-
-/**
- * The deamon app only briefly exists to start
- * the background job. The stack size assigned in the
- * Makefile does only apply to this management task.
- *
- * The actual stack size should be set in the call
- * to task_create().
- */
-int att_pos_estimator_ekf_main(int argc, char *argv[])
-{
-
-	if (argc < 1)
-		usage("missing command");
-
-	if (!strcmp(argv[1], "start")) {
-
-		if (thread_running) {
-			warnx("already running");
-			/* this is not an error */
-			exit(0);
-		}
-
-		thread_should_exit = false;
-
-		daemon_task = task_spawn_cmd("att_pos_estimator_ekf",
-					 SCHED_DEFAULT,
-					 SCHED_PRIORITY_MAX - 30,
-					 8192,
-					 kalman_demo_thread_main,
-					 (argv) ? (const char **)&argv[2] : (const char **)NULL);
-		exit(0);
-	}
-
-	if (!strcmp(argv[1], "stop")) {
-		thread_should_exit = true;
-		exit(0);
-	}
-
-	if (!strcmp(argv[1], "status")) {
-		if (thread_running) {
-			warnx("is running\n");
-			exit(0);
-
-		} else {
-			warnx("not started\n");
-			exit(1);
-		}
-
-	}
-
-	usage("unrecognized command");
-	exit(1);
-}
-
-int kalman_demo_thread_main(int argc, char *argv[])
-{
-
-	warnx("starting");
-
-	using namespace math;
-
-	thread_running = true;
-
-	KalmanNav nav(NULL, "KF");
-
-	while (!thread_should_exit) {
-		nav.update();
-	}
-
-	warnx("exiting.");
-
-	thread_running = false;
-
-	return 0;
-}
diff --git a/src/modules/att_pos_estimator_ekf/module.mk b/src/modules/att_pos_estimator_ekf/module.mk
deleted file mode 100644
index 8d4a40d95..000000000
--- a/src/modules/att_pos_estimator_ekf/module.mk
+++ /dev/null
@@ -1,42 +0,0 @@
-############################################################################
-#
-#   Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions
-# are met:
-#
-# 1. Redistributions of source code must retain the above copyright
-#    notice, this list of conditions and the following disclaimer.
-# 2. Redistributions in binary form must reproduce the above copyright
-#    notice, this list of conditions and the following disclaimer in
-#    the documentation and/or other materials provided with the
-#    distribution.
-# 3. Neither the name PX4 nor the names of its contributors may be
-#    used to endorse or promote products derived from this software
-#    without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
-# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
-# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-# POSSIBILITY OF SUCH DAMAGE.
-#
-############################################################################
-
-#
-# Full attitude / position Extended Kalman Filter
-#
-
-MODULE_COMMAND	= att_pos_estimator_ekf
-
-SRCS		= kalman_main.cpp \
-		  KalmanNav.cpp \
-		  params.c
diff --git a/src/modules/attitude_estimator_ekf/attitude_estimator_ekf_main.cpp b/src/modules/attitude_estimator_ekf/attitude_estimator_ekf_main.cpp
index 10a6cd2c5..35dc39ec6 100755
--- a/src/modules/attitude_estimator_ekf/attitude_estimator_ekf_main.cpp
+++ b/src/modules/attitude_estimator_ekf/attitude_estimator_ekf_main.cpp
@@ -1,8 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: Tobias Naegeli <naegelit@student.ethz.ch>
- *           Lorenz Meier <lm@inf.ethz.ch>
+ *   Copyright (c) 2012-2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -34,9 +32,12 @@
  ****************************************************************************/
 
 /*
- * @file attitude_estimator_ekf_main.c
+ * @file attitude_estimator_ekf_main.cpp
  *
  * Extended Kalman Filter for Attitude Estimation.
+ *
+ * @author Tobias Naegeli <naegelit@student.ethz.ch>
+ * @author Lorenz Meier <lm@inf.ethz.ch>
  */
 
 #include <nuttx/config.h>
@@ -64,6 +65,7 @@
 #include <drivers/drv_hrt.h>
 
 #include <lib/mathlib/mathlib.h>
+#include <lib/geo/geo.h>
 
 #include <systemlib/systemlib.h>
 #include <systemlib/perf_counter.h>
@@ -111,7 +113,7 @@ usage(const char *reason)
  * Makefile does only apply to this management task.
  *
  * The actual stack size should be set in the call
- * to task_create().
+ * to task_spawn_cmd().
  */
 int attitude_estimator_ekf_main(int argc, char *argv[])
 {
@@ -265,7 +267,6 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 	orb_advert_t pub_att = orb_advertise(ORB_ID(vehicle_attitude), &att);
 
 	int loopcounter = 0;
-	int printcounter = 0;
 
 	thread_running = true;
 
@@ -273,9 +274,6 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 	// struct debug_key_value_s dbg = { .key = "", .value = 0.0f };
 	// orb_advert_t pub_dbg = -1;
 
-	float sensor_update_hz[3] = {0.0f, 0.0f, 0.0f};
-	// XXX write this out to perf regs
-
 	/* keep track of sensor updates */
 	uint64_t sensor_last_timestamp[3] = {0, 0, 0};
 
@@ -286,11 +284,12 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 	/* initialize parameter handles */
 	parameters_init(&ekf_param_handles);
 
-	uint64_t start_time = hrt_absolute_time();
 	bool initialized = false;
 
 	float gyro_offsets[3] = { 0.0f, 0.0f, 0.0f };
-	unsigned offset_count = 0;
+
+	/* magnetic declination, in radians */
+	float mag_decl = 0.0f;
 
 	/* rotation matrix for magnetic declination */
 	math::Matrix<3, 3> R_decl;
@@ -330,9 +329,6 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 
 				/* update parameters */
 				parameters_update(&ekf_param_handles, &ekf_params);
-
-				/* update mag declination rotation matrix */
-				R_decl.from_euler(0.0f, 0.0f, ekf_params.mag_decl);
 			}
 
 			/* only run filter if sensor values changed */
@@ -345,6 +341,13 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 				orb_check(sub_gps, &gps_updated);
 				if (gps_updated) {
 					orb_copy(ORB_ID(vehicle_gps_position), sub_gps, &gps);
+
+					if (gps.eph < 20.0f && hrt_elapsed_time(&gps.timestamp_position) < 1000000) {
+						mag_decl = math::radians(get_mag_declination(gps.lat / 1e7f, gps.lon / 1e7f));
+
+						/* update mag declination rotation matrix */
+						R_decl.from_euler(0.0f, 0.0f, mag_decl);
+					}
 				}
 
 				bool global_pos_updated;
@@ -381,7 +384,7 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 					/* Fill in gyro measurements */
 					if (sensor_last_timestamp[0] != raw.timestamp) {
 						update_vect[0] = 1;
-						sensor_update_hz[0] = 1e6f / (raw.timestamp - sensor_last_timestamp[0]);
+						// sensor_update_hz[0] = 1e6f / (raw.timestamp - sensor_last_timestamp[0]);
 						sensor_last_timestamp[0] = raw.timestamp;
 					}
 
@@ -392,13 +395,13 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 					/* update accelerometer measurements */
 					if (sensor_last_timestamp[1] != raw.accelerometer_timestamp) {
 						update_vect[1] = 1;
-						sensor_update_hz[1] = 1e6f / (raw.timestamp - sensor_last_timestamp[1]);
+						// sensor_update_hz[1] = 1e6f / (raw.timestamp - sensor_last_timestamp[1]);
 						sensor_last_timestamp[1] = raw.accelerometer_timestamp;
 					}
 
 					hrt_abstime vel_t = 0;
 					bool vel_valid = false;
-					if (ekf_params.acc_comp == 1 && gps.fix_type >= 3 && gps.eph_m < 10.0f && gps.vel_ned_valid && hrt_absolute_time() < gps.timestamp_velocity + 500000) {
+					if (ekf_params.acc_comp == 1 && gps.fix_type >= 3 && gps.eph < 10.0f && gps.vel_ned_valid && hrt_absolute_time() < gps.timestamp_velocity + 500000) {
 						vel_valid = true;
 						if (gps_updated) {
 							vel_t = gps.timestamp_velocity;
@@ -407,7 +410,7 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 							vel(2) = gps.vel_d_m_s;
 						}
 
-					} else if (ekf_params.acc_comp == 2 && global_pos.global_valid && hrt_absolute_time() < global_pos.timestamp + 500000) {
+					} else if (ekf_params.acc_comp == 2 && gps.eph < 5.0f && global_pos.timestamp != 0 && hrt_absolute_time() < global_pos.timestamp + 20000) {
 						vel_valid = true;
 						if (global_pos_updated) {
 							vel_t = global_pos.timestamp;
@@ -444,7 +447,7 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 					/* update magnetometer measurements */
 					if (sensor_last_timestamp[2] != raw.magnetometer_timestamp) {
 						update_vect[2] = 1;
-						sensor_update_hz[2] = 1e6f / (raw.timestamp - sensor_last_timestamp[2]);
+						// sensor_update_hz[2] = 1e6f / (raw.timestamp - sensor_last_timestamp[2]);
 						sensor_last_timestamp[2] = raw.magnetometer_timestamp;
 					}
 
@@ -474,7 +477,15 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 						parameters_update(&ekf_param_handles, &ekf_params);
 
 						/* update mag declination rotation matrix */
-						R_decl.from_euler(0.0f, 0.0f, ekf_params.mag_decl);
+						if (gps.eph < 20.0f && hrt_elapsed_time(&gps.timestamp_position) < 1000000) {
+							mag_decl = math::radians(get_mag_declination(gps.lat / 1e7f, gps.lon / 1e7f));
+
+						} else {
+							mag_decl = ekf_params.mag_decl;
+						}
+
+						/* update mag declination rotation matrix */
+						R_decl.from_euler(0.0f, 0.0f, mag_decl);
 
 						x_aposteriori_k[0] = z_k[0];
 						x_aposteriori_k[1] = z_k[1];
@@ -497,8 +508,6 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 						continue;
 					}
 
-					uint64_t timing_start = hrt_absolute_time();
-
 					attitudeKalmanfilter(update_vect, dt, z_k, x_aposteriori_k, P_aposteriori_k, ekf_params.q, ekf_params.r,
 							     euler, Rot_matrix, x_aposteriori, P_aposteriori);
 
@@ -522,7 +531,7 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 
 					att.roll = euler[0];
 					att.pitch = euler[1];
-					att.yaw = euler[2] + ekf_params.mag_decl;
+					att.yaw = euler[2] + mag_decl;
 
 					att.rollspeed = x_aposteriori[0];
 					att.pitchspeed = x_aposteriori[1];
diff --git a/src/modules/attitude_estimator_ekf/attitude_estimator_ekf_params.c b/src/modules/attitude_estimator_ekf/attitude_estimator_ekf_params.c
index 4154e3db4..bc0e3b93a 100755
--- a/src/modules/attitude_estimator_ekf/attitude_estimator_ekf_params.c
+++ b/src/modules/attitude_estimator_ekf/attitude_estimator_ekf_params.c
@@ -40,6 +40,7 @@
  */
 
 #include "attitude_estimator_ekf_params.h"
+#include <math.h>
 
 /* Extended Kalman Filter covariances */
 
@@ -60,11 +61,6 @@ PARAM_DEFINE_FLOAT(EKF_ATT_V4_R2, 100.0f);
 /* offset estimation - UNUSED */
 PARAM_DEFINE_FLOAT(EKF_ATT_V4_R3, 0.0f);
 
-/* offsets in roll, pitch and yaw of sensor plane and body */
-PARAM_DEFINE_FLOAT(ATT_ROLL_OFF3, 0.0f);
-PARAM_DEFINE_FLOAT(ATT_PITCH_OFF3, 0.0f);
-PARAM_DEFINE_FLOAT(ATT_YAW_OFF3, 0.0f);
-
 /* magnetic declination, in degrees */
 PARAM_DEFINE_FLOAT(ATT_MAG_DECL, 0.0f);
 
@@ -84,10 +80,6 @@ int parameters_init(struct attitude_estimator_ekf_param_handles *h)
 	h->r2 	=	param_find("EKF_ATT_V4_R2");
 	h->r3 	=	param_find("EKF_ATT_V4_R3");
 
-	h->roll_off  =	param_find("ATT_ROLL_OFF3");
-	h->pitch_off =	param_find("ATT_PITCH_OFF3");
-	h->yaw_off   =	param_find("ATT_YAW_OFF3");
-
 	h->mag_decl   =	param_find("ATT_MAG_DECL");
 
 	h->acc_comp   =	param_find("ATT_ACC_COMP");
@@ -108,11 +100,8 @@ int parameters_update(const struct attitude_estimator_ekf_param_handles *h, stru
 	param_get(h->r2, &(p->r[2]));
 	param_get(h->r3, &(p->r[3]));
 
-	param_get(h->roll_off, &(p->roll_off));
-	param_get(h->pitch_off, &(p->pitch_off));
-	param_get(h->yaw_off, &(p->yaw_off));
-
 	param_get(h->mag_decl, &(p->mag_decl));
+	p->mag_decl *= M_PI_F / 180.0f;
 
 	param_get(h->acc_comp, &(p->acc_comp));
 
diff --git a/src/modules/attitude_estimator_ekf/attitude_estimator_ekf_params.h b/src/modules/attitude_estimator_ekf/attitude_estimator_ekf_params.h
index 74a141609..5985541ca 100755
--- a/src/modules/attitude_estimator_ekf/attitude_estimator_ekf_params.h
+++ b/src/modules/attitude_estimator_ekf/attitude_estimator_ekf_params.h
@@ -54,7 +54,6 @@ struct attitude_estimator_ekf_params {
 struct attitude_estimator_ekf_param_handles {
 	param_t r0, r1, r2, r3;
 	param_t q0, q1, q2, q3, q4;
-	param_t roll_off, pitch_off, yaw_off;
 	param_t mag_decl;
 	param_t acc_comp;
 };
diff --git a/src/modules/attitude_estimator_ekf/module.mk b/src/modules/attitude_estimator_ekf/module.mk
index d98647f99..99d0c5bf2 100644
--- a/src/modules/attitude_estimator_ekf/module.mk
+++ b/src/modules/attitude_estimator_ekf/module.mk
@@ -50,3 +50,5 @@ SRCS		 = attitude_estimator_ekf_main.cpp \
 		   codegen/rtGetNaN.c \
 		   codegen/norm.c \
 		   codegen/cross.c
+
+MODULE_STACKSIZE = 1200
diff --git a/src/modules/attitude_estimator_so3/attitude_estimator_so3_main.cpp b/src/modules/attitude_estimator_so3/attitude_estimator_so3_main.cpp
index 3653defa6..e49027e47 100755
--- a/src/modules/attitude_estimator_so3/attitude_estimator_so3_main.cpp
+++ b/src/modules/attitude_estimator_so3/attitude_estimator_so3_main.cpp
@@ -1,8 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2013 PX4 Development Team. All rights reserved.
- *   Author: Hyon Lim <limhyon@gmail.com>
- *           Anton Babushkin <anton.babushkin@me.com>
+ *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -36,6 +34,9 @@
  /*
  * @file attitude_estimator_so3_main.cpp
  *
+ * @author Hyon Lim <limhyon@gmail.com>
+ * @author Anton Babushkin <anton.babushkin@me.com>
+ *
  * Implementation of nonlinear complementary filters on the SO(3).
  * This code performs attitude estimation by using accelerometer, gyroscopes and magnetometer.
  * Result is provided as quaternion, 1-2-3 Euler angle and rotation matrix.
@@ -131,7 +132,7 @@ usage(const char *reason)
  * Makefile does only apply to this management task.
  *
  * The actual stack size should be set in the call
- * to task_create().
+ * to task_spawn_cmd().
  */
 int attitude_estimator_so3_main(int argc, char *argv[])
 {
@@ -391,8 +392,6 @@ void NonlinearSO3AHRSupdate(float gx, float gy, float gz, float ax, float ay, fl
  */
 int attitude_estimator_so3_thread_main(int argc, char *argv[])
 {
-	const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
-
 	//! Time constant
 	float dt = 0.005f;
 	
@@ -437,11 +436,9 @@ int attitude_estimator_so3_thread_main(int argc, char *argv[])
 	orb_advert_t att_pub = orb_advertise(ORB_ID(vehicle_attitude), &att);
 
 	int loopcounter = 0;
-	int printcounter = 0;
 
 	thread_running = true;
 
-	float sensor_update_hz[3] = {0.0f, 0.0f, 0.0f};
 	// XXX write this out to perf regs
 
 	/* keep track of sensor updates */
@@ -512,7 +509,7 @@ int attitude_estimator_so3_thread_main(int argc, char *argv[])
 						gyro_offsets[0] /= offset_count;
 						gyro_offsets[1] /= offset_count;
 						gyro_offsets[2] /= offset_count;
-						warnx("gyro initialized, offsets: %.5f %.5f %.5f", gyro_offsets[0], gyro_offsets[1], gyro_offsets[2]);
+						warnx("gyro initialized, offsets: %.5f %.5f %.5f", (double)gyro_offsets[0], (double)gyro_offsets[1], (double)gyro_offsets[2]);
 					}
 
 				} else {
@@ -522,12 +519,9 @@ int attitude_estimator_so3_thread_main(int argc, char *argv[])
 					/* Calculate data time difference in seconds */
 					dt = (raw.timestamp - last_measurement) / 1000000.0f;
 					last_measurement = raw.timestamp;
-					uint8_t update_vect[3] = {0, 0, 0};
 
 					/* Fill in gyro measurements */
 					if (sensor_last_timestamp[0] != raw.timestamp) {
-						update_vect[0] = 1;
-						sensor_update_hz[0] = 1e6f / (raw.timestamp - sensor_last_timestamp[0]);
 						sensor_last_timestamp[0] = raw.timestamp;
 					}
 
@@ -537,8 +531,6 @@ int attitude_estimator_so3_thread_main(int argc, char *argv[])
 
 					/* update accelerometer measurements */
 					if (sensor_last_timestamp[1] != raw.accelerometer_timestamp) {
-						update_vect[1] = 1;
-						sensor_update_hz[1] = 1e6f / (raw.timestamp - sensor_last_timestamp[1]);
 						sensor_last_timestamp[1] = raw.accelerometer_timestamp;
 					}
 
@@ -548,8 +540,6 @@ int attitude_estimator_so3_thread_main(int argc, char *argv[])
 
 					/* update magnetometer measurements */
 					if (sensor_last_timestamp[2] != raw.magnetometer_timestamp) {
-						update_vect[2] = 1;
-						sensor_update_hz[2] = 1e6f / (raw.timestamp - sensor_last_timestamp[2]);
 						sensor_last_timestamp[2] = raw.magnetometer_timestamp;
 					}
 
@@ -568,8 +558,6 @@ int attitude_estimator_so3_thread_main(int argc, char *argv[])
 						continue;
 					}
 
-					uint64_t timing_start = hrt_absolute_time();
-
 					// NOTE : Accelerometer is reversed.
 					// Because proper mount of PX4 will give you a reversed accelerometer readings.
 					NonlinearSO3AHRSupdate(gyro[0], gyro[1], gyro[2],
@@ -608,9 +596,9 @@ int attitude_estimator_so3_thread_main(int argc, char *argv[])
 						/* due to inputs or numerical failure the output is invalid, skip it */
 						// Due to inputs or numerical failure the output is invalid
 						warnx("infinite euler angles, rotation matrix:");
-						warnx("%.3f %.3f %.3f", Rot_matrix[0], Rot_matrix[1], Rot_matrix[2]);
-						warnx("%.3f %.3f %.3f", Rot_matrix[3], Rot_matrix[4], Rot_matrix[5]);
-						warnx("%.3f %.3f %.3f", Rot_matrix[6], Rot_matrix[7], Rot_matrix[8]);
+						warnx("%.3f %.3f %.3f", (double)Rot_matrix[0], (double)Rot_matrix[1], (double)Rot_matrix[2]);
+						warnx("%.3f %.3f %.3f", (double)Rot_matrix[3], (double)Rot_matrix[4], (double)Rot_matrix[5]);
+						warnx("%.3f %.3f %.3f", (double)Rot_matrix[6], (double)Rot_matrix[7], (double)Rot_matrix[8]);
 						// Don't publish anything
 						continue;
 					}
diff --git a/src/modules/attitude_estimator_so3/module.mk b/src/modules/attitude_estimator_so3/module.mk
index e29bb16a6..f52715abb 100644
--- a/src/modules/attitude_estimator_so3/module.mk
+++ b/src/modules/attitude_estimator_so3/module.mk
@@ -6,3 +6,5 @@ MODULE_COMMAND	 = attitude_estimator_so3
 
 SRCS		 = attitude_estimator_so3_main.cpp \
 		   attitude_estimator_so3_params.c
+
+MODULE_STACKSIZE = 1200
diff --git a/src/modules/commander/accelerometer_calibration.cpp b/src/modules/commander/accelerometer_calibration.cpp
index 1cbdf9bf8..be465ab76 100644
--- a/src/modules/commander/accelerometer_calibration.cpp
+++ b/src/modules/commander/accelerometer_calibration.cpp
@@ -131,6 +131,7 @@
 #include <fcntl.h>
 #include <sys/prctl.h>
 #include <math.h>
+#include <float.h>
 #include <mathlib/mathlib.h>
 #include <string.h>
 #include <drivers/drv_hrt.h>
@@ -158,6 +159,8 @@ int calculate_calibration_values(float accel_ref[6][3], float accel_T[3][3], flo
 
 int do_accel_calibration(int mavlink_fd)
 {
+	int fd;
+
 	mavlink_log_info(mavlink_fd, CAL_STARTED_MSG, sensor_name);
 
 	struct accel_scale accel_scale = {
@@ -172,7 +175,7 @@ int do_accel_calibration(int mavlink_fd)
 	int res = OK;
 
 	/* reset all offsets to zero and all scales to one */
-	int fd = open(ACCEL_DEVICE_PATH, 0);
+	fd = open(ACCEL_DEVICE_PATH, 0);
 	res = ioctl(fd, ACCELIOCSSCALE, (long unsigned int)&accel_scale);
 	close(fd);
 
@@ -194,13 +197,13 @@ int do_accel_calibration(int mavlink_fd)
 		int32_t board_rotation_int;
 		param_get(board_rotation_h, &(board_rotation_int));
 		enum Rotation board_rotation_id = (enum Rotation)board_rotation_int;
-		math::Matrix<3,3> board_rotation;
+		math::Matrix<3, 3> board_rotation;
 		get_rot_matrix(board_rotation_id, &board_rotation);
-		math::Matrix<3,3> board_rotation_t = board_rotation.transposed();
+		math::Matrix<3, 3> board_rotation_t = board_rotation.transposed();
 		math::Vector<3> accel_offs_vec(&accel_offs[0]);
-		math::Vector<3> accel_offs_rotated = board_rotation_t * accel_offs_vec;
-		math::Matrix<3,3> accel_T_mat(&accel_T[0][0]);
-		math::Matrix<3,3> accel_T_rotated = board_rotation_t * accel_T_mat * board_rotation;
+		math::Vector<3> accel_offs_rotated = board_rotation_t *accel_offs_vec;
+		math::Matrix<3, 3> accel_T_mat(&accel_T[0][0]);
+		math::Matrix<3, 3> accel_T_rotated = board_rotation_t *accel_T_mat * board_rotation;
 
 		accel_scale.x_offset = accel_offs_rotated(0);
 		accel_scale.x_scale = accel_T_rotated(0, 0);
@@ -223,7 +226,7 @@ int do_accel_calibration(int mavlink_fd)
 
 	if (res == OK) {
 		/* apply new scaling and offsets */
-		int fd = open(ACCEL_DEVICE_PATH, 0);
+		fd = open(ACCEL_DEVICE_PATH, 0);
 		res = ioctl(fd, ACCELIOCSSCALE, (long unsigned int)&accel_scale);
 		close(fd);
 
@@ -277,11 +280,13 @@ int do_accel_calibration_measurements(int mavlink_fd, float accel_offs[3], float
 			}
 		}
 
-		if (old_done_count != done_count)
+		if (old_done_count != done_count) {
 			mavlink_log_info(mavlink_fd, CAL_PROGRESS_MSG, sensor_name, 17 * done_count);
+		}
 
-		if (done)
+		if (done) {
 			break;
+		}
 
 		mavlink_log_info(mavlink_fd, "directions left: %s%s%s%s%s%s",
 				 (!data_collected[0]) ? "x+ " : "",
@@ -380,11 +385,13 @@ int detect_orientation(int mavlink_fd, int sub_sensor_combined)
 				d = d * d;
 				accel_disp[i] = accel_disp[i] * (1.0f - w);
 
-				if (d > still_thr2 * 8.0f)
+				if (d > still_thr2 * 8.0f) {
 					d = still_thr2 * 8.0f;
+				}
 
-				if (d > accel_disp[i])
+				if (d > accel_disp[i]) {
 					accel_disp[i] = d;
+				}
 			}
 
 			/* still detector with hysteresis */
@@ -432,33 +439,39 @@ int detect_orientation(int mavlink_fd, int sub_sensor_combined)
 
 	if (fabsf(accel_ema[0] - CONSTANTS_ONE_G) < accel_err_thr &&
 	    fabsf(accel_ema[1]) < accel_err_thr &&
-	    fabsf(accel_ema[2]) < accel_err_thr)
-		return 0;	// [ g, 0, 0 ]
+	    fabsf(accel_ema[2]) < accel_err_thr) {
+		return 0;        // [ g, 0, 0 ]
+	}
 
 	if (fabsf(accel_ema[0] + CONSTANTS_ONE_G) < accel_err_thr &&
 	    fabsf(accel_ema[1]) < accel_err_thr &&
-	    fabsf(accel_ema[2]) < accel_err_thr)
-		return 1;	// [ -g, 0, 0 ]
+	    fabsf(accel_ema[2]) < accel_err_thr) {
+		return 1;        // [ -g, 0, 0 ]
+	}
 
 	if (fabsf(accel_ema[0]) < accel_err_thr &&
 	    fabsf(accel_ema[1] - CONSTANTS_ONE_G) < accel_err_thr &&
-	    fabsf(accel_ema[2]) < accel_err_thr)
-		return 2;	// [ 0, g, 0 ]
+	    fabsf(accel_ema[2]) < accel_err_thr) {
+		return 2;        // [ 0, g, 0 ]
+	}
 
 	if (fabsf(accel_ema[0]) < accel_err_thr &&
 	    fabsf(accel_ema[1] + CONSTANTS_ONE_G) < accel_err_thr &&
-	    fabsf(accel_ema[2]) < accel_err_thr)
-		return 3;	// [ 0, -g, 0 ]
+	    fabsf(accel_ema[2]) < accel_err_thr) {
+		return 3;        // [ 0, -g, 0 ]
+	}
 
 	if (fabsf(accel_ema[0]) < accel_err_thr &&
 	    fabsf(accel_ema[1]) < accel_err_thr &&
-	    fabsf(accel_ema[2] - CONSTANTS_ONE_G) < accel_err_thr)
-		return 4;	// [ 0, 0, g ]
+	    fabsf(accel_ema[2] - CONSTANTS_ONE_G) < accel_err_thr) {
+		return 4;        // [ 0, 0, g ]
+	}
 
 	if (fabsf(accel_ema[0]) < accel_err_thr &&
 	    fabsf(accel_ema[1]) < accel_err_thr &&
-	    fabsf(accel_ema[2] + CONSTANTS_ONE_G) < accel_err_thr)
-		return 5;	// [ 0, 0, -g ]
+	    fabsf(accel_ema[2] + CONSTANTS_ONE_G) < accel_err_thr) {
+		return 5;        // [ 0, 0, -g ]
+	}
 
 	mavlink_log_critical(mavlink_fd, "ERROR: invalid orientation");
 
@@ -485,8 +498,9 @@ int read_accelerometer_avg(int sensor_combined_sub, float accel_avg[3], int samp
 			struct sensor_combined_s sensor;
 			orb_copy(ORB_ID(sensor_combined), sensor_combined_sub, &sensor);
 
-			for (int i = 0; i < 3; i++)
+			for (int i = 0; i < 3; i++) {
 				accel_sum[i] += sensor.accelerometer_m_s2[i];
+			}
 
 			count++;
 
@@ -495,8 +509,9 @@ int read_accelerometer_avg(int sensor_combined_sub, float accel_avg[3], int samp
 			continue;
 		}
 
-		if (errcount > samples_num / 10)
+		if (errcount > samples_num / 10) {
 			return ERROR;
+		}
 	}
 
 	for (int i = 0; i < 3; i++) {
@@ -512,8 +527,9 @@ int mat_invert3(float src[3][3], float dst[3][3])
 		    src[0][1] * (src[1][0] * src[2][2] - src[1][2] * src[2][0]) +
 		    src[0][2] * (src[1][0] * src[2][1] - src[1][1] * src[2][0]);
 
-	if (det == 0.0f)
-		return ERROR;	// Singular matrix
+	if (fabsf(det) < FLT_EPSILON) {
+		return ERROR;        // Singular matrix
+	}
 
 	dst[0][0] = (src[1][1] * src[2][2] - src[1][2] * src[2][1]) / det;
 	dst[1][0] = (src[1][2] * src[2][0] - src[1][0] * src[2][2]) / det;
@@ -549,8 +565,9 @@ int calculate_calibration_values(float accel_ref[6][3], float accel_T[3][3], flo
 	/* calculate inverse matrix for A */
 	float mat_A_inv[3][3];
 
-	if (mat_invert3(mat_A, mat_A_inv) != OK)
+	if (mat_invert3(mat_A, mat_A_inv) != OK) {
 		return ERROR;
+	}
 
 	/* copy results to accel_T */
 	for (int i = 0; i < 3; i++) {
diff --git a/src/modules/commander/airspeed_calibration.cpp b/src/modules/commander/airspeed_calibration.cpp
index 6039d92a7..5d21d89d0 100644
--- a/src/modules/commander/airspeed_calibration.cpp
+++ b/src/modules/commander/airspeed_calibration.cpp
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2013 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -64,9 +64,9 @@ int do_airspeed_calibration(int mavlink_fd)
 {
 	/* give directions */
 	mavlink_log_info(mavlink_fd, CAL_STARTED_MSG, sensor_name);
-	mavlink_log_info(mavlink_fd, "don't move system");
+	mavlink_log_info(mavlink_fd, "ensure airspeed sensor is not registering wind");
 
-	const int calibration_count = 2500;
+	const int calibration_count = 2000;
 
 	int diff_pres_sub = orb_subscribe(ORB_ID(differential_pressure));
 	struct differential_pressure_s diff_pres;
@@ -82,16 +82,21 @@ int do_airspeed_calibration(int mavlink_fd)
 
 	bool paramreset_successful = false;
 	int  fd = open(AIRSPEED_DEVICE_PATH, 0);
+
 	if (fd > 0) {
 		if (OK == ioctl(fd, AIRSPEEDIOCSSCALE, (long unsigned int)&airscale)) {
 			paramreset_successful = true;
+
+		} else {
+			mavlink_log_critical(mavlink_fd, "airspeed offset zero failed");
 		}
+
 		close(fd);
 	}
 
 	if (!paramreset_successful) {
-		warn("WARNING: failed to set scale / offsets for airspeed sensor");
-		mavlink_log_critical(mavlink_fd, "could not reset dpress sensor");
+		warn("FAILED to set scale / offsets for airspeed");
+		mavlink_log_critical(mavlink_fd, "dpress reset failed");
 		mavlink_log_info(mavlink_fd, CAL_FAILED_MSG, sensor_name);
 		return ERROR;
 	}
@@ -107,11 +112,12 @@ int do_airspeed_calibration(int mavlink_fd)
 
 		if (poll_ret) {
 			orb_copy(ORB_ID(differential_pressure), diff_pres_sub, &diff_pres);
-			diff_pres_offset += diff_pres.differential_pressure_pa;
+			diff_pres_offset += diff_pres.differential_pressure_raw_pa;
 			calibration_counter++;
 
-			if (calibration_counter % (calibration_count / 20) == 0)
+			if (calibration_counter % (calibration_count / 20) == 0) {
 				mavlink_log_info(mavlink_fd, CAL_PROGRESS_MSG, sensor_name, (calibration_counter * 100) / calibration_count);
+			}
 
 		} else if (poll_ret == 0) {
 			/* any poll failure for 1s is a reason to abort */
diff --git a/src/modules/commander/calibration_routines.cpp b/src/modules/commander/calibration_routines.cpp
index be38ea104..43f341ae7 100644
--- a/src/modules/commander/calibration_routines.cpp
+++ b/src/modules/commander/calibration_routines.cpp
@@ -40,6 +40,7 @@
  */
 
 #include <math.h>
+#include <float.h>
 
 #include "calibration_routines.h"
 
@@ -170,7 +171,7 @@ int sphere_fit_least_squares(const float x[], const float y[], const float z[],
 	float aA, aB, aC, nA, nB, nC, dA, dB, dC;
 
 	//Iterate N times, ignore stop condition.
-	int n = 0;
+	unsigned int n = 0;
 
 	while (n < max_iterations) {
 		n++;
@@ -179,9 +180,9 @@ int sphere_fit_least_squares(const float x[], const float y[], const float z[],
 		aA = Q2 + 16.0f * (A2 - 2.0f * A * x_sum + x_sum2);
 		aB = Q2 + 16.0f * (B2 - 2.0f * B * y_sum + y_sum2);
 		aC = Q2 + 16.0f * (C2 - 2.0f * C * z_sum + z_sum2);
-		aA = (aA == 0.0f) ? 1.0f : aA;
-		aB = (aB == 0.0f) ? 1.0f : aB;
-		aC = (aC == 0.0f) ? 1.0f : aC;
+		aA = (fabsf(aA) < FLT_EPSILON) ? 1.0f : aA;
+		aB = (fabsf(aB) < FLT_EPSILON) ? 1.0f : aB;
+		aC = (fabsf(aC) < FLT_EPSILON) ? 1.0f : aC;
 
 		//Compute next iteration
 		nA = A - ((F2 + 16.0f * (B * XY + C * XZ + x_sum * (-A2 - Q0) + A * (x_sum2 + Q1 - C * z_sum - B * y_sum))) / aA);
diff --git a/src/modules/commander/commander.cpp b/src/modules/commander/commander.cpp
index cf7ba757e..efa26eb97 100644
--- a/src/modules/commander/commander.cpp
+++ b/src/modules/commander/commander.cpp
@@ -1,11 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2013 PX4 Development Team. All rights reserved.
- *   Author: Petri Tanskanen <petri.tanskanen@inf.ethz.ch>
- *           Lorenz Meier <lm@inf.ethz.ch>
- *           Thomas Gubler <thomasgubler@student.ethz.ch>
- *           Julian Oes <joes@student.ethz.ch>
- *           Anton Babushkin <anton.babushkin@me.com>
+ *   Copyright (C) 2013-2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -38,8 +33,13 @@
 
 /**
  * @file commander.cpp
- * Main system state machine implementation.
+ * Main fail-safe handling.
  *
+ * @author Petri Tanskanen <petri.tanskanen@inf.ethz.ch>
+ * @author Lorenz Meier <lm@inf.ethz.ch>
+ * @author Thomas Gubler <thomasgubler@student.ethz.ch>
+ * @author Julian Oes <julian@oes.ch>
+ * @author Anton Babushkin <anton.babushkin@me.com>
  */
 
 #include <nuttx/config.h>
@@ -52,6 +52,7 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <systemlib/err.h>
+#include <systemlib/circuit_breaker.h>
 #include <debug.h>
 #include <sys/prctl.h>
 #include <sys/stat.h>
@@ -67,6 +68,7 @@
 #include <uORB/topics/home_position.h>
 #include <uORB/topics/vehicle_global_position.h>
 #include <uORB/topics/vehicle_local_position.h>
+#include <uORB/topics/position_setpoint_triplet.h>
 #include <uORB/topics/vehicle_gps_position.h>
 #include <uORB/topics/vehicle_command.h>
 #include <uORB/topics/subsystem_info.h>
@@ -75,6 +77,9 @@
 #include <uORB/topics/parameter_update.h>
 #include <uORB/topics/differential_pressure.h>
 #include <uORB/topics/safety.h>
+#include <uORB/topics/system_power.h>
+#include <uORB/topics/mission_result.h>
+#include <uORB/topics/telemetry_status.h>
 
 #include <drivers/drv_led.h>
 #include <drivers/drv_hrt.h>
@@ -86,6 +91,7 @@
 #include <systemlib/err.h>
 #include <systemlib/cpuload.h>
 #include <systemlib/rc_check.h>
+#include <systemlib/state_table.h>
 
 #include "px4_custom_mode.h"
 #include "commander_helper.h"
@@ -112,15 +118,15 @@ extern struct system_load_s system_load;
 
 #define MAVLINK_OPEN_INTERVAL 50000
 
-#define STICK_ON_OFF_LIMIT 0.75f
-#define STICK_THRUST_RANGE 1.0f
+#define STICK_ON_OFF_LIMIT 0.9f
 #define STICK_ON_OFF_HYSTERESIS_TIME_MS 1000
 #define STICK_ON_OFF_COUNTER_LIMIT (STICK_ON_OFF_HYSTERESIS_TIME_MS*COMMANDER_MONITORING_LOOPSPERMSEC)
 
-#define POSITION_TIMEOUT 1000000 /**< consider the local or global position estimate invalid after 1s */
-#define RC_TIMEOUT 100000
-#define RC_TIMEOUT_HIL 500000
-#define DIFFPRESS_TIMEOUT 2000000
+#define POSITION_TIMEOUT		(600 * 1000)		/**< consider the local or global position estimate invalid after 600ms */
+#define FAILSAFE_DEFAULT_TIMEOUT	(3 * 1000 * 1000)	/**< hysteresis time - the failsafe will trigger after 3 seconds in this state */
+#define RC_TIMEOUT			500000
+#define DL_TIMEOUT			5 * 1000* 1000
+#define DIFFPRESS_TIMEOUT		2000000
 
 #define PRINT_INTERVAL	5000000
 #define PRINT_MODE_REJECT_INTERVAL	2000000
@@ -138,7 +144,7 @@ enum MAV_MODE_FLAG {
 };
 
 /* Mavlink file descriptors */
-static int mavlink_fd;
+static int mavlink_fd = 0;
 
 /* flags */
 static bool commander_initialized = false;
@@ -154,6 +160,7 @@ static bool on_usb_power = false;
 
 static float takeoff_alt = 5.0f;
 static int parachute_enabled = 0;
+static float eph_epv_threshold = 5.0f;
 
 static struct vehicle_status_s status;
 static struct actuator_armed_s armed;
@@ -195,7 +202,7 @@ void usage(const char *reason);
 /**
  * React to commands that are sent e.g. from the mavlink module.
  */
-bool handle_command(struct vehicle_status_s *status, struct vehicle_command_s *cmd, struct actuator_armed_s *armed);
+bool handle_command(struct vehicle_status_s *status, const struct safety_s *safety, struct vehicle_command_s *cmd, struct actuator_armed_s *armed, struct home_position_s *home, struct vehicle_global_position_s *global_pos, orb_advert_t *home_pub);
 
 /**
  * Mainloop of commander.
@@ -208,7 +215,7 @@ void check_valid(hrt_abstime timestamp, hrt_abstime timeout, bool valid_in, bool
 
 void check_mode_switches(struct manual_control_setpoint_s *sp_man, struct vehicle_status_s *status);
 
-transition_result_t set_main_state_rc(struct vehicle_status_s *status);
+transition_result_t set_main_state_rc(struct vehicle_status_s *status, struct manual_control_setpoint_s *sp_man);
 
 void set_control_mode();
 
@@ -218,11 +225,10 @@ void print_reject_arm(const char *msg);
 
 void print_status();
 
-int arm();
-int disarm();
-
 transition_result_t check_navigation_state_machine(struct vehicle_status_s *status, struct vehicle_control_mode_s *control_mode, struct vehicle_local_position_s *local_pos);
 
+transition_result_t arm_disarm(bool arm, const int mavlink_fd, const char *armedBy);
+
 /**
  * Loop that runs at a lower rate and priority for calibration and parameter tasks.
  */
@@ -233,8 +239,9 @@ void answer_command(struct vehicle_command_s &cmd, enum VEHICLE_CMD_RESULT resul
 
 int commander_main(int argc, char *argv[])
 {
-	if (argc < 1)
+	if (argc < 1) {
 		usage("missing command");
+	}
 
 	if (!strcmp(argv[1], "start")) {
 
@@ -248,7 +255,7 @@ int commander_main(int argc, char *argv[])
 		daemon_task = task_spawn_cmd("commander",
 					     SCHED_DEFAULT,
 					     SCHED_PRIORITY_MAX - 40,
-					     3000,
+					     2950,
 					     commander_thread_main,
 					     (argv) ? (const char **)&argv[2] : (const char **)NULL);
 
@@ -261,8 +268,9 @@ int commander_main(int argc, char *argv[])
 
 	if (!strcmp(argv[1], "stop")) {
 
-		if (!thread_running)
+		if (!thread_running) {
 			errx(0, "commander already stopped");
+		}
 
 		thread_should_exit = true;
 
@@ -289,12 +297,12 @@ int commander_main(int argc, char *argv[])
 	}
 
 	if (!strcmp(argv[1], "arm")) {
-		arm();
+		arm_disarm(true, mavlink_fd, "command line");
 		exit(0);
 	}
 
-	if (!strcmp(argv[1], "disarm")) {
-		disarm();
+	if (!strcmp(argv[1], "2")) {
+		arm_disarm(false, mavlink_fd, "command line");
 		exit(0);
 	}
 
@@ -304,8 +312,9 @@ int commander_main(int argc, char *argv[])
 
 void usage(const char *reason)
 {
-	if (reason)
+	if (reason) {
 		fprintf(stderr, "%s\n", reason);
+	}
 
 	fprintf(stderr, "usage: daemon {start|stop|status} [-p <additional params>]\n\n");
 	exit(1);
@@ -364,175 +373,122 @@ void print_status()
 
 static orb_advert_t status_pub;
 
-int arm()
+transition_result_t arm_disarm(bool arm, const int mavlink_fd_local, const char *armedBy)
 {
-	int arming_res = arming_state_transition(&status, &safety, ARMING_STATE_ARMED, &armed);
+	transition_result_t arming_res = TRANSITION_NOT_CHANGED;
 
-	if (arming_res == TRANSITION_CHANGED) {
-		mavlink_log_info(mavlink_fd, "[cmd] ARMED by commandline");
-		return 0;
+	// Transition the armed state. By passing mavlink_fd to arming_state_transition it will
+	// output appropriate error messages if the state cannot transition.
+	arming_res = arming_state_transition(&status, &safety, arm ? ARMING_STATE_ARMED : ARMING_STATE_STANDBY, &armed, mavlink_fd_local);
 
-	} else {
-		return 1;
+	if (arming_res == TRANSITION_CHANGED && mavlink_fd) {
+		mavlink_log_info(mavlink_fd_local, "[cmd] %s by %s", arm ? "ARMED" : "DISARMED", armedBy);
+
+	} else if (arming_res == TRANSITION_DENIED) {
+		tune_negative(true);
 	}
+
+	return arming_res;
 }
 
-int disarm()
+bool handle_command(struct vehicle_status_s *status, const struct safety_s *safety, struct vehicle_command_s *cmd, struct actuator_armed_s *armed, struct home_position_s *home, struct vehicle_global_position_s *global_pos, orb_advert_t *home_pub)
 {
-	int arming_res = arming_state_transition(&status, &safety, ARMING_STATE_STANDBY, &armed);
-
-	if (arming_res == TRANSITION_CHANGED) {
-		mavlink_log_info(mavlink_fd, "[cmd] ARMED by commandline");
-		return 0;
-
-	} else {
-		return 1;
+	/* only handle commands that are meant to be handled by this system and component */
+	if (cmd->target_system != status->system_id || ((cmd->target_component != status->component_id) && (cmd->target_component != 0))) { // component_id 0: valid for all components
+		return false;
 	}
-}
 
-bool handle_command(struct vehicle_status_s *status, const struct safety_s *safety, struct vehicle_command_s *cmd, struct actuator_armed_s *armed)
-{
 	/* result of the command */
-	enum VEHICLE_CMD_RESULT result = VEHICLE_CMD_RESULT_UNSUPPORTED;
-	bool ret = false;
-
-	/* only handle high-priority commands here */
+	enum VEHICLE_CMD_RESULT cmd_result = VEHICLE_CMD_RESULT_UNSUPPORTED;
 
 	/* request to set different system mode */
 	switch (cmd->command) {
 	case VEHICLE_CMD_DO_SET_MODE: {
-			uint8_t base_mode = (uint8_t) cmd->param1;
-			uint8_t custom_main_mode = (uint8_t) cmd->param2;
-			transition_result_t arming_res = TRANSITION_NOT_CHANGED;
-
-			/* set HIL state */
-			hil_state_t new_hil_state = (base_mode & MAV_MODE_FLAG_HIL_ENABLED) ? HIL_STATE_ON : HIL_STATE_OFF;
-			int hil_ret = hil_state_transition(new_hil_state, status_pub, status, mavlink_fd);
+			uint8_t base_mode = (uint8_t)cmd->param1;
+			uint8_t custom_main_mode = (uint8_t)cmd->param2;
 
-			/* if HIL got enabled, reset battery status state */
-			if (hil_ret == OK && status->hil_state == HIL_STATE_ON) {
-				/* reset the arming mode to disarmed */
-				arming_res = arming_state_transition(status, safety, ARMING_STATE_STANDBY, armed);
-
-				if (arming_res != TRANSITION_DENIED) {
-					mavlink_log_info(mavlink_fd, "[cmd] HIL: Reset ARMED state to standby");
-
-				} else {
-					mavlink_log_info(mavlink_fd, "[cmd] HIL: FAILED resetting armed state");
-				}
-			}
+			transition_result_t arming_ret = TRANSITION_NOT_CHANGED;
 
-			if (hil_ret == OK)
-				ret = true;
+			transition_result_t main_ret = TRANSITION_NOT_CHANGED;
 
-			// TODO remove debug code
-			//mavlink_log_critical(mavlink_fd, "#audio: command setmode: %d %d", base_mode, custom_main_mode);
-			/* set arming state */
-			arming_res = TRANSITION_NOT_CHANGED;
-
-			if (base_mode & MAV_MODE_FLAG_SAFETY_ARMED) {
-				if (safety->safety_switch_available && !safety->safety_off && status->hil_state == HIL_STATE_OFF) {
-					print_reject_arm("NOT ARMING: Press safety switch first.");
-					arming_res = TRANSITION_DENIED;
-
-				} else {
-					arming_res = arming_state_transition(status, safety, ARMING_STATE_ARMED, armed);
-				}
-
-				if (arming_res == TRANSITION_CHANGED) {
-					mavlink_log_info(mavlink_fd, "[cmd] ARMED by command");
-				}
-
-			} else {
-				if (status->arming_state == ARMING_STATE_ARMED || status->arming_state == ARMING_STATE_ARMED_ERROR) {
-					arming_state_t new_arming_state = (status->arming_state == ARMING_STATE_ARMED ? ARMING_STATE_STANDBY : ARMING_STATE_STANDBY_ERROR);
-					arming_res = arming_state_transition(status, safety, new_arming_state, armed);
-
-					if (arming_res == TRANSITION_CHANGED) {
-						mavlink_log_info(mavlink_fd, "[cmd] DISARMED by command");
-					}
-
-				} else {
-					arming_res = TRANSITION_NOT_CHANGED;
-				}
-			}
-
-			if (arming_res == TRANSITION_CHANGED)
-				ret = true;
+			/* set HIL state */
+			hil_state_t new_hil_state = (base_mode & MAV_MODE_FLAG_HIL_ENABLED) ? HIL_STATE_ON : HIL_STATE_OFF;
+			transition_result_t hil_ret = hil_state_transition(new_hil_state, status_pub, status, mavlink_fd);
 
-			/* set main state */
-			transition_result_t main_res = TRANSITION_DENIED;
+			// Transition the arming state
+			arming_ret = arm_disarm(base_mode & MAV_MODE_FLAG_SAFETY_ARMED, mavlink_fd, "set mode command");
 
 			if (base_mode & MAV_MODE_FLAG_CUSTOM_MODE_ENABLED) {
 				/* use autopilot-specific mode */
 				if (custom_main_mode == PX4_CUSTOM_MAIN_MODE_MANUAL) {
 					/* MANUAL */
-					main_res = main_state_transition(status, MAIN_STATE_MANUAL);
+					main_ret = main_state_transition(status, MAIN_STATE_MANUAL);
 
-				} else if (custom_main_mode == PX4_CUSTOM_MAIN_MODE_SEATBELT) {
-					/* SEATBELT */
-					main_res = main_state_transition(status, MAIN_STATE_SEATBELT);
+				} else if (custom_main_mode == PX4_CUSTOM_MAIN_MODE_ALTCTL) {
+					/* ALTCTL */
+					main_ret = main_state_transition(status, MAIN_STATE_ALTCTL);
 
-				} else if (custom_main_mode == PX4_CUSTOM_MAIN_MODE_EASY) {
-					/* EASY */
-					main_res = main_state_transition(status, MAIN_STATE_EASY);
+				} else if (custom_main_mode == PX4_CUSTOM_MAIN_MODE_POSCTL) {
+					/* POSCTL */
+					main_ret = main_state_transition(status, MAIN_STATE_POSCTL);
 
 				} else if (custom_main_mode == PX4_CUSTOM_MAIN_MODE_AUTO) {
 					/* AUTO */
-					main_res = main_state_transition(status, MAIN_STATE_AUTO);
+					main_ret = main_state_transition(status, MAIN_STATE_AUTO_MISSION);
+
+				} else if (custom_main_mode == PX4_CUSTOM_MAIN_MODE_ACRO) {
+					/* ACRO */
+					main_ret = main_state_transition(status, MAIN_STATE_ACRO);
 				}
 
 			} else {
 				/* use base mode */
 				if (base_mode & MAV_MODE_FLAG_AUTO_ENABLED) {
 					/* AUTO */
-					main_res = main_state_transition(status, MAIN_STATE_AUTO);
+					main_ret = main_state_transition(status, MAIN_STATE_AUTO_MISSION);
 
 				} else if (base_mode & MAV_MODE_FLAG_MANUAL_INPUT_ENABLED) {
 					if (base_mode & MAV_MODE_FLAG_GUIDED_ENABLED) {
-						/* EASY */
-						main_res = main_state_transition(status, MAIN_STATE_EASY);
+						/* POSCTL */
+						main_ret = main_state_transition(status, MAIN_STATE_POSCTL);
 
 					} else if (base_mode & MAV_MODE_FLAG_STABILIZE_ENABLED) {
 						/* MANUAL */
-						main_res = main_state_transition(status, MAIN_STATE_MANUAL);
+						main_ret = main_state_transition(status, MAIN_STATE_MANUAL);
 					}
 				}
 			}
 
-			if (main_res == TRANSITION_CHANGED)
-				ret = true;
-
-			if (arming_res != TRANSITION_DENIED && main_res != TRANSITION_DENIED) {
-				result = VEHICLE_CMD_RESULT_ACCEPTED;
+			if (hil_ret != TRANSITION_DENIED && arming_ret != TRANSITION_DENIED && main_ret != TRANSITION_DENIED) {
+				cmd_result = VEHICLE_CMD_RESULT_ACCEPTED;
 
 			} else {
-				result = VEHICLE_CMD_RESULT_TEMPORARILY_REJECTED;
+				cmd_result = VEHICLE_CMD_RESULT_TEMPORARILY_REJECTED;
 			}
-
-			break;
 		}
+		break;
 
 	case VEHICLE_CMD_COMPONENT_ARM_DISARM: {
-			transition_result_t arming_res = TRANSITION_NOT_CHANGED;
+			// Follow exactly what the mavlink spec says for values: 0.0f for disarm, 1.0f for arm.
+			// We use an float epsilon delta to test float equality.
+			if (cmd->param1 != 0.0f && (fabsf(cmd->param1 - 1.0f) > 2.0f * FLT_EPSILON)) {
+				mavlink_log_info(mavlink_fd, "Unsupported ARM_DISARM parameter: %.6f", cmd->param1);
 
-			if (!armed->armed && ((int)(cmd->param1 + 0.5f)) == 1) {
-				if (safety->safety_switch_available && !safety->safety_off && status->hil_state == HIL_STATE_OFF) {
-					print_reject_arm("NOT ARMING: Press safety switch first.");
-					arming_res = TRANSITION_DENIED;
+			} else {
 
-				} else {
-					arming_res = arming_state_transition(status, safety, ARMING_STATE_ARMED, armed);
+				// Flick to inair restore first if this comes from an onboard system
+				if (cmd->source_system == status->system_id && cmd->source_component == status->component_id) {
+					status->arming_state = ARMING_STATE_IN_AIR_RESTORE;
 				}
 
-				if (arming_res == TRANSITION_CHANGED) {
-					mavlink_log_critical(mavlink_fd, "#audio: ARMED by component arm cmd");
-					result = VEHICLE_CMD_RESULT_ACCEPTED;
-					ret = true;
+				transition_result_t arming_res = arm_disarm(cmd->param1 != 0.0f, mavlink_fd, "arm/disarm component command");
 
-				} else {
+				if (arming_res == TRANSITION_DENIED) {
 					mavlink_log_critical(mavlink_fd, "#audio: REJECTING component arm cmd");
-					result = VEHICLE_CMD_RESULT_TEMPORARILY_REJECTED;
+					cmd_result = VEHICLE_CMD_RESULT_TEMPORARILY_REJECTED;
+
+				} else {
+					cmd_result = VEHICLE_CMD_RESULT_ACCEPTED;
 				}
 			}
 		}
@@ -543,42 +499,93 @@ bool handle_command(struct vehicle_status_s *status, const struct safety_s *safe
 			unsigned int mav_goto = cmd->param1;
 
 			if (mav_goto == 0) {	// MAV_GOTO_DO_HOLD
-				status->set_nav_state = NAV_STATE_LOITER;
-				status->set_nav_state_timestamp = hrt_absolute_time();
+				status->nav_state = NAVIGATION_STATE_AUTO_LOITER;
 				mavlink_log_critical(mavlink_fd, "#audio: pause mission cmd");
-				result = VEHICLE_CMD_RESULT_ACCEPTED;
-				ret = true;
+				cmd_result = VEHICLE_CMD_RESULT_ACCEPTED;
 
 			} else if (mav_goto == 1) {	// MAV_GOTO_DO_CONTINUE
-				status->set_nav_state = NAV_STATE_MISSION;
-				status->set_nav_state_timestamp = hrt_absolute_time();
+				status->nav_state = NAVIGATION_STATE_AUTO_MISSION;
 				mavlink_log_critical(mavlink_fd, "#audio: continue mission cmd");
-				result = VEHICLE_CMD_RESULT_ACCEPTED;
-				ret = true;
+				cmd_result = VEHICLE_CMD_RESULT_ACCEPTED;
 
 			} else {
-				mavlink_log_info(mavlink_fd, "Unsupported OVERRIDE_GOTO: %f %f %f %f %f %f %f %f", cmd->param1, cmd->param2, cmd->param3, cmd->param4, cmd->param5, cmd->param6, cmd->param7);
+				mavlink_log_info(mavlink_fd, "Unsupported OVERRIDE_GOTO: %f %f %f %f %f %f %f %f",
+					(double)cmd->param1,
+					(double)cmd->param2,
+					(double)cmd->param3,
+					(double)cmd->param4,
+					(double)cmd->param5,
+					(double)cmd->param6,
+					(double)cmd->param7);
 			}
 		}
 		break;
 
-		/* Flight termination */
+#if 0
+	/* Flight termination */
 	case VEHICLE_CMD_DO_SET_SERVO: { //xxx: needs its own mavlink command
 
 			//XXX: to enable the parachute, a param needs to be set
 			//xxx: for safety only for now, param3 is unused by VEHICLE_CMD_DO_SET_SERVO
 			if (armed->armed && cmd->param3 > 0.5 && parachute_enabled) {
 				transition_result_t failsafe_res = failsafe_state_transition(status, FAILSAFE_STATE_TERMINATION);
-				result = VEHICLE_CMD_RESULT_ACCEPTED;
-				ret = true;
+				cmd_result = VEHICLE_CMD_RESULT_ACCEPTED;
 
 			} else {
 				/* reject parachute depoyment not armed */
-				result = VEHICLE_CMD_RESULT_TEMPORARILY_REJECTED;
+				cmd_result = VEHICLE_CMD_RESULT_TEMPORARILY_REJECTED;
 			}
 
 		}
 		break;
+#endif
+
+	case VEHICLE_CMD_DO_SET_HOME: {
+			bool use_current = cmd->param1 > 0.5f;
+
+			if (use_current) {
+				/* use current position */
+				if (status->condition_global_position_valid) {
+					home->lat = global_pos->lat;
+					home->lon = global_pos->lon;
+					home->alt = global_pos->alt;
+
+					home->timestamp = hrt_absolute_time();
+
+					cmd_result = VEHICLE_CMD_RESULT_ACCEPTED;
+
+				} else {
+					cmd_result = VEHICLE_CMD_RESULT_TEMPORARILY_REJECTED;
+				}
+
+			} else {
+				/* use specified position */
+				home->lat = cmd->param5;
+				home->lon = cmd->param6;
+				home->alt = cmd->param7;
+
+				home->timestamp = hrt_absolute_time();
+
+				cmd_result = VEHICLE_CMD_RESULT_ACCEPTED;
+			}
+
+			if (cmd_result == VEHICLE_CMD_RESULT_ACCEPTED) {
+				warnx("home: lat = %.7f, lon = %.7f, alt = %.2f ", home->lat, home->lon, (double)home->alt);
+				mavlink_log_info(mavlink_fd, "[cmd] home: %.7f, %.7f, %.2f", home->lat, home->lon, (double)home->alt);
+
+				/* announce new home position */
+				if (*home_pub > 0) {
+					orb_publish(ORB_ID(home_position), *home_pub, home);
+
+				} else {
+					*home_pub = orb_advertise(ORB_ID(home_position), home);
+				}
+
+				/* mark home position as set */
+				status->condition_home_position_valid = true;
+			}
+		}
+		break;
 
 	case VEHICLE_CMD_PREFLIGHT_REBOOT_SHUTDOWN:
 	case VEHICLE_CMD_PREFLIGHT_CALIBRATION:
@@ -588,22 +595,24 @@ bool handle_command(struct vehicle_status_s *status, const struct safety_s *safe
 		break;
 
 	default:
-		/* warn about unsupported commands */
+		/* Warn about unsupported commands, this makes sense because only commands
+		 * to this component ID (or all) are passed by mavlink. */
 		answer_command(*cmd, VEHICLE_CMD_RESULT_UNSUPPORTED);
 		break;
 	}
 
-	if (result != VEHICLE_CMD_RESULT_UNSUPPORTED) {
+	if (cmd_result != VEHICLE_CMD_RESULT_UNSUPPORTED) {
 		/* already warned about unsupported commands in "default" case */
-		answer_command(*cmd, result);
+		answer_command(*cmd, cmd_result);
 	}
 
 	/* send any requested ACKs */
-	if (cmd->confirmation > 0 && result != VEHICLE_CMD_RESULT_UNSUPPORTED) {
+	if (cmd->confirmation > 0 && cmd_result != VEHICLE_CMD_RESULT_UNSUPPORTED) {
 		/* send acknowledge command */
 		// XXX TODO
 	}
 
+	return true;
 }
 
 int commander_thread_main(int argc, char *argv[])
@@ -612,6 +621,7 @@ int commander_thread_main(int argc, char *argv[])
 	commander_initialized = false;
 
 	bool arm_tune_played = false;
+	bool was_armed = false;
 
 	/* set parameters */
 	param_t _param_sys_type = param_find("MAV_TYPE");
@@ -619,30 +629,41 @@ int commander_thread_main(int argc, char *argv[])
 	param_t _param_component_id = param_find("MAV_COMP_ID");
 	param_t _param_takeoff_alt = param_find("NAV_TAKEOFF_ALT");
 	param_t _param_enable_parachute = param_find("NAV_PARACHUTE_EN");
+	param_t _param_enable_datalink_loss = param_find("COM_DL_LOSS_EN");
 
 	/* welcome user */
 	warnx("starting");
 
 	char *main_states_str[MAIN_STATE_MAX];
-	main_states_str[0] = "MANUAL";
-	main_states_str[1] = "SEATBELT";
-	main_states_str[2] = "EASY";
-	main_states_str[3] = "AUTO";
+	main_states_str[MAIN_STATE_MANUAL]			= "MANUAL";
+	main_states_str[MAIN_STATE_ALTCTL]			= "ALTCTL";
+	main_states_str[MAIN_STATE_POSCTL]			= "POSCTL";
+	main_states_str[MAIN_STATE_AUTO_MISSION]		= "AUTO_MISSION";
+	main_states_str[MAIN_STATE_AUTO_LOITER]			= "AUTO_LOITER";
+	main_states_str[MAIN_STATE_AUTO_RTL]			= "AUTO_RTL";
+	main_states_str[MAIN_STATE_ACRO]			= "ACRO";
 
 	char *arming_states_str[ARMING_STATE_MAX];
-	arming_states_str[0] = "INIT";
-	arming_states_str[1] = "STANDBY";
-	arming_states_str[2] = "ARMED";
-	arming_states_str[3] = "ARMED_ERROR";
-	arming_states_str[4] = "STANDBY_ERROR";
-	arming_states_str[5] = "REBOOT";
-	arming_states_str[6] = "IN_AIR_RESTORE";
-
-	char *failsafe_states_str[FAILSAFE_STATE_MAX];
-	failsafe_states_str[0] = "NORMAL";
-	failsafe_states_str[1] = "RTL";
-	failsafe_states_str[2] = "LAND";
-	failsafe_states_str[3] = "TERMINATION";
+	arming_states_str[ARMING_STATE_INIT]			= "INIT";
+	arming_states_str[ARMING_STATE_STANDBY]			= "STANDBY";
+	arming_states_str[ARMING_STATE_ARMED]			= "ARMED";
+	arming_states_str[ARMING_STATE_ARMED_ERROR]		= "ARMED_ERROR";
+	arming_states_str[ARMING_STATE_STANDBY_ERROR]		= "STANDBY_ERROR";
+	arming_states_str[ARMING_STATE_REBOOT]			= "REBOOT";
+	arming_states_str[ARMING_STATE_IN_AIR_RESTORE]		= "IN_AIR_RESTORE";
+
+	char *nav_states_str[NAVIGATION_STATE_MAX];
+	nav_states_str[NAVIGATION_STATE_MANUAL]			= "MANUAL";
+	nav_states_str[NAVIGATION_STATE_ALTCTL]			= "ALTCTL";
+	nav_states_str[NAVIGATION_STATE_POSCTL]			= "POSCTL";
+	nav_states_str[NAVIGATION_STATE_AUTO_MISSION]		= "AUTO_MISSION";
+	nav_states_str[NAVIGATION_STATE_AUTO_LOITER]		= "AUTO_LOITER";
+	nav_states_str[NAVIGATION_STATE_AUTO_RTL]		= "AUTO_RTL";
+	nav_states_str[NAVIGATION_STATE_AUTO_RTGS]		= "AUTO_RTGS";
+	nav_states_str[NAVIGATION_STATE_ACRO]			= "ACRO";
+	nav_states_str[NAVIGATION_STATE_LAND]			= "LAND";
+	nav_states_str[NAVIGATION_STATE_DESCEND]		= "DESCEND";
+	nav_states_str[NAVIGATION_STATE_TERMINATION]		= "TERMINATION";
 
 	/* pthread for slow low prio thread */
 	pthread_t commander_low_prio_thread;
@@ -664,11 +685,10 @@ int commander_thread_main(int argc, char *argv[])
 	// We want to accept RC inputs as default
 	status.rc_input_blocked = false;
 	status.main_state = MAIN_STATE_MANUAL;
-	status.set_nav_state = NAV_STATE_NONE;
-	status.set_nav_state_timestamp = 0;
+	status.nav_state = NAVIGATION_STATE_MANUAL;
 	status.arming_state = ARMING_STATE_INIT;
 	status.hil_state = HIL_STATE_OFF;
-	status.failsafe_state = FAILSAFE_STATE_NORMAL;
+	status.failsafe = false;
 
 	/* neither manual nor offboard control commands have been received */
 	status.offboard_control_signal_found_once = false;
@@ -677,6 +697,7 @@ int commander_thread_main(int argc, char *argv[])
 	/* mark all signals lost as long as they haven't been found */
 	status.rc_signal_lost = true;
 	status.offboard_control_signal_lost = true;
+	status.data_link_lost = true;
 
 	/* set battery warning flag */
 	status.battery_warning = VEHICLE_BATTERY_WARNING_NONE;
@@ -688,6 +709,12 @@ int commander_thread_main(int argc, char *argv[])
 	status.counter++;
 	status.timestamp = hrt_absolute_time();
 
+	status.condition_power_input_valid = true;
+	status.avionics_power_rail_voltage = -1.0f;
+
+	// CIRCUIT BREAKERS
+	status.circuit_breaker_engaged_power_check = false;
+
 	/* publish initial state */
 	status_pub = orb_advertise(ORB_ID(vehicle_status), &status);
 
@@ -719,7 +746,7 @@ int commander_thread_main(int argc, char *argv[])
 
 	pthread_attr_t commander_low_prio_attr;
 	pthread_attr_init(&commander_low_prio_attr);
-	pthread_attr_setstacksize(&commander_low_prio_attr, 2992);
+	pthread_attr_setstacksize(&commander_low_prio_attr, 2900);
 
 	struct sched_param param;
 	(void)pthread_attr_getschedparam(&commander_low_prio_attr, &param);
@@ -738,8 +765,8 @@ int commander_thread_main(int argc, char *argv[])
 	bool low_battery_voltage_actions_done = false;
 	bool critical_battery_voltage_actions_done = false;
 
-	uint64_t last_idle_time = 0;
-	uint64_t start_time = 0;
+	hrt_abstime last_idle_time = 0;
+	hrt_abstime start_time = 0;
 
 	bool status_changed = true;
 	bool param_init_forced = true;
@@ -754,6 +781,11 @@ int commander_thread_main(int argc, char *argv[])
 	safety.safety_switch_available = false;
 	safety.safety_off = false;
 
+	/* Subscribe to mission result topic */
+	int mission_result_sub = orb_subscribe(ORB_ID(mission_result));
+	struct mission_result_s mission_result;
+	memset(&mission_result, 0, sizeof(mission_result));
+
 	/* Subscribe to manual control data */
 	int sp_man_sub = orb_subscribe(ORB_ID(manual_control_setpoint));
 	struct manual_control_setpoint_s sp_man;
@@ -764,10 +796,18 @@ int commander_thread_main(int argc, char *argv[])
 	struct offboard_control_setpoint_s sp_offboard;
 	memset(&sp_offboard, 0, sizeof(sp_offboard));
 
+	/* Subscribe to telemetry status */
+	int telemetry_sub = orb_subscribe(ORB_ID(telemetry_status));
+	struct telemetry_status_s telemetry;
+	memset(&telemetry, 0, sizeof(telemetry));
+
 	/* Subscribe to global position */
 	int global_position_sub = orb_subscribe(ORB_ID(vehicle_global_position));
 	struct vehicle_global_position_s global_position;
 	memset(&global_position, 0, sizeof(global_position));
+	/* Init EPH and EPV */
+	global_position.eph = 1000.0f;
+	global_position.epv = 1000.0f;
 
 	/* Subscribe to local position data */
 	int local_position_sub = orb_subscribe(ORB_ID(vehicle_local_position));
@@ -815,6 +855,16 @@ int commander_thread_main(int argc, char *argv[])
 	struct subsystem_info_s info;
 	memset(&info, 0, sizeof(info));
 
+	/* Subscribe to position setpoint triplet */
+	int pos_sp_triplet_sub = orb_subscribe(ORB_ID(position_setpoint_triplet));
+	struct position_setpoint_triplet_s pos_sp_triplet;
+	memset(&pos_sp_triplet, 0, sizeof(pos_sp_triplet));
+
+	/* Subscribe to system power */
+	int system_power_sub = orb_subscribe(ORB_ID(system_power));
+	struct system_power_s system_power;
+	memset(&system_power, 0, sizeof(system_power));
+
 	control_status_leds(&status, &armed, true);
 
 	/* now initialized */
@@ -823,6 +873,16 @@ int commander_thread_main(int argc, char *argv[])
 
 	start_time = hrt_absolute_time();
 
+	transition_result_t arming_ret;
+
+	int32_t datalink_loss_enabled = false;
+
+	/* check which state machines for changes, clear "changed" flag */
+	bool arming_state_changed = false;
+	bool main_state_changed = false;
+	bool failsafe_old = false;
+	bool system_checked = false;
+
 	while (!thread_should_exit) {
 
 		if (mavlink_fd < 0 && counter % (1000000 / MAVLINK_OPEN_INTERVAL) == 0) {
@@ -830,6 +890,9 @@ int commander_thread_main(int argc, char *argv[])
 			mavlink_fd = open(MAVLINK_LOG_DEVICE, 0);
 		}
 
+		arming_ret = TRANSITION_NOT_CHANGED;
+
+
 		/* update parameters */
 		orb_check(param_changed_sub, &updated);
 
@@ -860,14 +923,28 @@ int commander_thread_main(int argc, char *argv[])
 				/* check and update system / component ID */
 				param_get(_param_system_id, &(status.system_id));
 				param_get(_param_component_id, &(status.component_id));
+
+				status.circuit_breaker_engaged_power_check = circuit_breaker_enabled("CBRK_SUPPLY_CHK", CBRK_SUPPLY_CHK_KEY);
+
 				status_changed = true;
 
 				/* re-check RC calibration */
 				rc_calibration_ok = (OK == rc_calibration_check(mavlink_fd));
 			}
+
 			/* navigation parameters */
 			param_get(_param_takeoff_alt, &takeoff_alt);
 			param_get(_param_enable_parachute, &parachute_enabled);
+			param_get(_param_enable_datalink_loss, &datalink_loss_enabled);
+		}
+
+		/* Perform system checks (again) once params are loaded and MAVLink is up. */
+		if (!system_checked && mavlink_fd && 
+			(telemetry.heartbeat_time > 0) &&
+			(hrt_elapsed_time(&telemetry.heartbeat_time) < 1 * 1000 * 1000)) {
+
+			(void)rc_calibration_check(mavlink_fd);
+			system_checked = true;
 		}
 
 		orb_check(sp_man_sub, &updated);
@@ -882,6 +959,12 @@ int commander_thread_main(int argc, char *argv[])
 			orb_copy(ORB_ID(offboard_control_setpoint), sp_offboard_sub, &sp_offboard);
 		}
 
+		orb_check(telemetry_sub, &updated);
+
+		if (updated) {
+			orb_copy(ORB_ID(telemetry_status), telemetry_sub, &telemetry);
+		}
+
 		orb_check(sensor_sub, &updated);
 
 		if (updated) {
@@ -894,6 +977,26 @@ int commander_thread_main(int argc, char *argv[])
 			orb_copy(ORB_ID(differential_pressure), diff_pres_sub, &diff_pres);
 		}
 
+		orb_check(system_power_sub, &updated);
+
+		if (updated) {
+			orb_copy(ORB_ID(system_power), system_power_sub, &system_power);
+
+			if (hrt_elapsed_time(&system_power.timestamp) < 200000) {
+				if (system_power.servo_valid &&
+					!system_power.brick_valid &&
+					!system_power.usb_connected) {
+					/* flying only on servo rail, this is unsafe */
+					status.condition_power_input_valid = false;
+				} else {
+					status.condition_power_input_valid = true;
+				}
+
+				/* copy avionics voltage */
+				status.avionics_power_rail_voltage = system_power.voltage5V_v;
+			}
+		}
+
 		check_valid(diff_pres.timestamp, DIFFPRESS_TIMEOUT, true, &(status.condition_airspeed_valid), &status_changed);
 
 		/* update safety topic */
@@ -905,8 +1008,10 @@ int commander_thread_main(int argc, char *argv[])
 			/* disarm if safety is now on and still armed */
 			if (status.hil_state == HIL_STATE_OFF && safety.safety_switch_available && !safety.safety_off && armed.armed) {
 				arming_state_t new_arming_state = (status.arming_state == ARMING_STATE_ARMED ? ARMING_STATE_STANDBY : ARMING_STATE_STANDBY_ERROR);
-				if (TRANSITION_CHANGED == arming_state_transition(&status, &safety, new_arming_state, &armed)) {
+
+				if (TRANSITION_CHANGED == arming_state_transition(&status, &safety, new_arming_state, &armed, mavlink_fd)) {
 					mavlink_log_info(mavlink_fd, "[cmd] DISARMED by safety switch");
+					arming_state_changed = true;
 				}
 			}
 		}
@@ -919,9 +1024,6 @@ int commander_thread_main(int argc, char *argv[])
 			orb_copy(ORB_ID(vehicle_global_position), global_position_sub, &global_position);
 		}
 
-		/* update condition_global_position_valid */
-		check_valid(global_position.timestamp, POSITION_TIMEOUT, global_position.global_valid, &(status.condition_global_position_valid), &status_changed);
-
 		/* update local position estimate */
 		orb_check(local_position_sub, &updated);
 
@@ -930,16 +1032,86 @@ int commander_thread_main(int argc, char *argv[])
 			orb_copy(ORB_ID(vehicle_local_position), local_position_sub, &local_position);
 		}
 
+		/* update condition_global_position_valid */
+		/* hysteresis for EPH/EPV */
+		bool eph_epv_good;
+
+		if (status.condition_global_position_valid) {
+			if (global_position.eph > eph_epv_threshold * 2.0f || global_position.epv > eph_epv_threshold * 2.0f) {
+				eph_epv_good = false;
+
+			} else {
+				eph_epv_good = true;
+			}
+
+		} else {
+			if (global_position.eph < eph_epv_threshold && global_position.epv < eph_epv_threshold) {
+				eph_epv_good = true;
+
+			} else {
+				eph_epv_good = false;
+			}
+		}
+
+		check_valid(global_position.timestamp, POSITION_TIMEOUT, eph_epv_good, &(status.condition_global_position_valid), &status_changed);
+
+		/* check if GPS fix is ok */
+
+		/* update home position */
+		if (!status.condition_home_position_valid && status.condition_global_position_valid && !armed.armed &&
+		    (global_position.eph < eph_epv_threshold) && (global_position.epv < eph_epv_threshold)) {
+
+			home.lat = global_position.lat;
+			home.lon = global_position.lon;
+			home.alt = global_position.alt;
+
+			home.x = local_position.x;
+			home.y = local_position.y;
+			home.z = local_position.z;
+
+			warnx("home: lat = %.7f, lon = %.7f, alt = %.2f ", home.lat, home.lon, (double)home.alt);
+			mavlink_log_info(mavlink_fd, "[cmd] home: %.7f, %.7f, %.2f", home.lat, home.lon, (double)home.alt);
+
+			/* announce new home position */
+			if (home_pub > 0) {
+				orb_publish(ORB_ID(home_position), home_pub, &home);
+
+			} else {
+				home_pub = orb_advertise(ORB_ID(home_position), &home);
+			}
+
+			/* mark home position as set */
+			status.condition_home_position_valid = true;
+			tune_positive(true);
+		}
+
 		/* update condition_local_position_valid and condition_local_altitude_valid */
-		check_valid(local_position.timestamp, POSITION_TIMEOUT, local_position.xy_valid, &(status.condition_local_position_valid), &status_changed);
+		/* hysteresis for EPH */
+		bool local_eph_good;
+
+		if (status.condition_global_position_valid) {
+			if (local_position.eph > eph_epv_threshold * 2.0f) {
+				local_eph_good = false;
+
+			} else {
+				local_eph_good = true;
+			}
+
+		} else {
+			if (local_position.eph < eph_epv_threshold) {
+				local_eph_good = true;
+
+			} else {
+				local_eph_good = false;
+			}
+		}
+		check_valid(local_position.timestamp, POSITION_TIMEOUT, local_position.xy_valid && local_eph_good, &(status.condition_local_position_valid), &status_changed);
 		check_valid(local_position.timestamp, POSITION_TIMEOUT, local_position.z_valid, &(status.condition_local_altitude_valid), &status_changed);
 
-		static bool published_condition_landed_fw = false;
-		if (status.is_rotary_wing && status.condition_local_altitude_valid) {
+		if (status.condition_local_altitude_valid) {
 			if (status.condition_landed != local_position.landed) {
 				status.condition_landed = local_position.landed;
 				status_changed = true;
-				published_condition_landed_fw = false; //make sure condition_landed is published again if the system type changes
 
 				if (status.condition_landed) {
 					mavlink_log_critical(mavlink_fd, "#audio: LANDED");
@@ -948,12 +1120,6 @@ int commander_thread_main(int argc, char *argv[])
 					mavlink_log_critical(mavlink_fd, "#audio: IN AIR");
 				}
 			}
-		} else {
-			if (!published_condition_landed_fw) {
-				status.condition_landed = false; // Fixedwing does not have a landing detector currently
-				published_condition_landed_fw = true;
-				status_changed = true;
-			}
 		}
 
 		/* update battery status */
@@ -963,7 +1129,7 @@ int commander_thread_main(int argc, char *argv[])
 			orb_copy(ORB_ID(battery_status), battery_sub, &battery);
 
 			/* only consider battery voltage if system has been running 2s and battery voltage is valid */
-			if (status.hil_state == HIL_STATE_OFF && hrt_absolute_time() > start_time + 2000000 && battery.voltage_filtered_v > 0.0f) {
+			if (hrt_absolute_time() > start_time + 2000000 && battery.voltage_filtered_v > 0.0f) {
 				status.battery_voltage = battery.voltage_filtered_v;
 				status.battery_current = battery.current_a;
 				status.condition_battery_voltage_valid = true;
@@ -1006,12 +1172,20 @@ int commander_thread_main(int argc, char *argv[])
 			status_changed = true;
 		}
 
+		/* update position setpoint triplet */
+		orb_check(pos_sp_triplet_sub, &updated);
+
+		if (updated) {
+			orb_copy(ORB_ID(position_setpoint_triplet), pos_sp_triplet_sub, &pos_sp_triplet);
+		}
+
 		if (counter % (1000000 / COMMANDER_MONITORING_INTERVAL) == 0) {
 			/* compute system load */
 			uint64_t interval_runtime = system_load.tasks[0].total_runtime - last_idle_time;
 
-			if (last_idle_time > 0)
-				status.load = 1.0f - ((float)interval_runtime / 1e6f);	//system load is time spent in non-idle
+			if (last_idle_time > 0) {
+				status.load = 1.0f - ((float)interval_runtime / 1e6f);        //system load is time spent in non-idle
+			}
 
 			last_idle_time = system_load.tasks[0].total_runtime;
 
@@ -1034,12 +1208,19 @@ int commander_thread_main(int argc, char *argv[])
 			status.battery_warning = VEHICLE_BATTERY_WARNING_CRITICAL;
 
 			if (armed.armed) {
-				arming_state_transition(&status, &safety, ARMING_STATE_ARMED_ERROR, &armed);
+				arming_ret = arming_state_transition(&status, &safety, ARMING_STATE_ARMED_ERROR, &armed, mavlink_fd);
+
+				if (arming_ret == TRANSITION_CHANGED) {
+					arming_state_changed = true;
+				}
 
 			} else {
-				arming_state_transition(&status, &safety, ARMING_STATE_STANDBY_ERROR, &armed);
-			}
+				arming_ret = arming_state_transition(&status, &safety, ARMING_STATE_STANDBY_ERROR, &armed, mavlink_fd);
 
+				if (arming_ret == TRANSITION_CHANGED) {
+					arming_state_changed = true;
+				}
+			}
 			status_changed = true;
 		}
 
@@ -1047,11 +1228,15 @@ int commander_thread_main(int argc, char *argv[])
 
 		/* If in INIT state, try to proceed to STANDBY state */
 		if (status.arming_state == ARMING_STATE_INIT && low_prio_task == LOW_PRIO_TASK_NONE) {
-			// XXX check for sensors
-			arming_state_transition(&status, &safety, ARMING_STATE_STANDBY, &armed);
+			/* TODO: check for sensors */
+			arming_ret = arming_state_transition(&status, &safety, ARMING_STATE_STANDBY, &armed, mavlink_fd);
+
+			if (arming_ret == TRANSITION_CHANGED) {
+				arming_state_changed = true;
+			}
 
 		} else {
-			// XXX: Add emergency stuff if sensors are lost
+			/* TODO: Add emergency stuff if sensors are lost */
 		}
 
 
@@ -1068,57 +1253,16 @@ int commander_thread_main(int argc, char *argv[])
 
 		if (updated) {
 			orb_copy(ORB_ID(vehicle_gps_position), gps_sub, &gps_position);
-			/* check if GPS fix is ok */
-			float hdop_threshold_m = 4.0f;
-			float vdop_threshold_m = 8.0f;
-
-			/*
-			 * If horizontal dilution of precision (hdop / eph)
-			 * and vertical diluation of precision (vdop / epv)
-			 * are below a certain threshold (e.g. 4 m), AND
-			 * home position is not yet set AND the last GPS
-			 * GPS measurement is not older than two seconds AND
-			 * the system is currently not armed, set home
-			 * position to the current position.
-			 */
-
-			if (!status.condition_home_position_valid && gps_position.fix_type >= 3 &&
-			    (gps_position.eph_m < hdop_threshold_m) && (gps_position.epv_m < vdop_threshold_m) &&
-			    (hrt_absolute_time() < gps_position.timestamp_position + POSITION_TIMEOUT) && !armed.armed
-			    && global_position.global_valid) {
-
-				/* copy position data to uORB home message, store it locally as well */
-				home.lat = global_position.lat;
-				home.lon = global_position.lon;
-				home.alt = global_position.alt;
-
-				warnx("home: lat = %.7f, lon = %.7f, alt = %.4f ", home.lat, home.lon, (double)home.alt);
-				mavlink_log_info(mavlink_fd, "[cmd] home: %.7f, %.7f, %.4f", home.lat, home.lon, (double)home.alt);
-
-				/* announce new home position */
-				if (home_pub > 0) {
-					orb_publish(ORB_ID(home_position), home_pub, &home);
-
-				} else {
-					home_pub = orb_advertise(ORB_ID(home_position), &home);
-				}
-
-				/* mark home position as set */
-				status.condition_home_position_valid = true;
-				tune_positive(true);
-			}
 		}
 
+		orb_check(mission_result_sub, &updated);
 
-		/*
-		 * XXX workaround:
-		 * Prevent RC loss in HIL when sensors.cpp is only publishing sp_man at a low rate (e.g. 30Hz)
-		 * which can trigger RC loss if the computer/simulator lags.
-		 */
-		uint64_t rc_timeout = status.hil_state == HIL_STATE_ON ? RC_TIMEOUT_HIL : RC_TIMEOUT;
+		if (updated) {
+			orb_copy(ORB_ID(mission_result), mission_result_sub, &mission_result);
+		}
 
-		/* start RC input check */
-		if (!status.rc_input_blocked && sp_man.timestamp != 0 && hrt_absolute_time() < sp_man.timestamp + rc_timeout) {
+		/* RC input check */
+		if (!status.rc_input_blocked && sp_man.timestamp != 0 && hrt_absolute_time() < sp_man.timestamp + RC_TIMEOUT) {
 			/* handle the case where RC signal was regained */
 			if (!status.rc_signal_found_once) {
 				status.rc_signal_found_once = true;
@@ -1134,22 +1278,20 @@ int commander_thread_main(int argc, char *argv[])
 
 			status.rc_signal_lost = false;
 
-			transition_result_t res;	// store all transitions results here
-
-			/* arm/disarm by RC */
-			res = TRANSITION_NOT_CHANGED;
-
-			/* check if left stick is in lower left position and we are in MANUAL or AUTO_READY mode or (ASSISTED mode and landed) -> disarm
+			/* check if left stick is in lower left position and we are in MANUAL or AUTO_READY mode or (ASSIST mode and landed) -> disarm
 			 * do it only for rotary wings */
 			if (status.is_rotary_wing &&
 			    (status.arming_state == ARMING_STATE_ARMED || status.arming_state == ARMING_STATE_ARMED_ERROR) &&
-			    (status.main_state == MAIN_STATE_MANUAL || status.condition_landed) &&
-			    sp_man.yaw < -STICK_ON_OFF_LIMIT && sp_man.throttle < STICK_THRUST_RANGE * 0.1f) {
+			    (status.main_state == MAIN_STATE_MANUAL || status.main_state == MAIN_STATE_ACRO || status.condition_landed) &&
+			    sp_man.r < -STICK_ON_OFF_LIMIT && sp_man.z < 0.1f) {
 
 				if (stick_off_counter > STICK_ON_OFF_COUNTER_LIMIT) {
 					/* disarm to STANDBY if ARMED or to STANDBY_ERROR if ARMED_ERROR */
 					arming_state_t new_arming_state = (status.arming_state == ARMING_STATE_ARMED ? ARMING_STATE_STANDBY : ARMING_STATE_STANDBY_ERROR);
-					res = arming_state_transition(&status, &safety, new_arming_state, &armed);
+					arming_ret = arming_state_transition(&status, &safety, new_arming_state, &armed, mavlink_fd);
+					if (arming_ret == TRANSITION_CHANGED) {
+						arming_state_changed = true;
+					}
 					stick_off_counter = 0;
 
 				} else {
@@ -1162,16 +1304,20 @@ int commander_thread_main(int argc, char *argv[])
 
 			/* check if left stick is in lower right position and we're in MANUAL mode -> arm */
 			if (status.arming_state == ARMING_STATE_STANDBY &&
-			    sp_man.yaw > STICK_ON_OFF_LIMIT && sp_man.throttle < STICK_THRUST_RANGE * 0.1f) {
+			    sp_man.r > STICK_ON_OFF_LIMIT && sp_man.z < 0.1f) {
 				if (stick_on_counter > STICK_ON_OFF_COUNTER_LIMIT) {
-					if (safety.safety_switch_available && !safety.safety_off && status.hil_state == HIL_STATE_OFF) {
-						print_reject_arm("NOT ARMING: Press safety switch first.");
-
-					} else if (status.main_state != MAIN_STATE_MANUAL) {
-						print_reject_arm("NOT ARMING: Switch to MANUAL mode first.");
 
+					/* we check outside of the transition function here because the requirement
+					 * for being in manual mode only applies to manual arming actions.
+					 * the system can be armed in auto if armed via the GCS.
+					 */
+					if (status.main_state != MAIN_STATE_MANUAL) {
+						print_reject_arm("#audio: NOT ARMING: Switch to MANUAL mode first.");
 					} else {
-						res = arming_state_transition(&status, &safety, ARMING_STATE_ARMED, &armed);
+						arming_ret = arming_state_transition(&status, &safety, ARMING_STATE_ARMED, &armed, mavlink_fd);
+						if (arming_ret == TRANSITION_CHANGED) {
+							arming_state_changed = true;
+						}
 					}
 
 					stick_on_counter = 0;
@@ -1184,35 +1330,30 @@ int commander_thread_main(int argc, char *argv[])
 				stick_on_counter = 0;
 			}
 
-			if (res == TRANSITION_CHANGED) {
+			if (arming_ret == TRANSITION_CHANGED) {
 				if (status.arming_state == ARMING_STATE_ARMED) {
 					mavlink_log_info(mavlink_fd, "[cmd] ARMED by RC");
 
 				} else {
 					mavlink_log_info(mavlink_fd, "[cmd] DISARMED by RC");
 				}
+				arming_state_changed = true;
 
-			} else if (res == TRANSITION_DENIED) {
+			} else if (arming_ret == TRANSITION_DENIED) {
 				/* DENIED here indicates bug in the commander */
 				mavlink_log_critical(mavlink_fd, "ERROR: arming state transition denied");
+				tune_negative(true);
 			}
 
-			if (status.failsafe_state != FAILSAFE_STATE_NORMAL) {
-				/* recover from failsafe */
-				transition_result_t res = failsafe_state_transition(&status, FAILSAFE_STATE_NORMAL);
-			}
-
-			/* fill status according to mode switches */
-			check_mode_switches(&sp_man, &status);
-
 			/* evaluate the main state machine according to mode switches */
-			res = set_main_state_rc(&status);
+			transition_result_t main_res = set_main_state_rc(&status, &sp_man);
 
 			/* play tune on mode change only if armed, blink LED always */
-			if (res == TRANSITION_CHANGED) {
+			if (main_res == TRANSITION_CHANGED) {
 				tune_positive(armed.armed);
+				main_state_changed = true;
 
-			} else if (res == TRANSITION_DENIED) {
+			} else if (main_res == TRANSITION_DENIED) {
 				/* DENIED here indicates bug in the commander */
 				mavlink_log_critical(mavlink_fd, "ERROR: main state transition denied");
 			}
@@ -1223,50 +1364,22 @@ int commander_thread_main(int argc, char *argv[])
 				status.rc_signal_lost = true;
 				status_changed = true;
 			}
+		}
 
-			if (armed.armed) {
-				if (status.main_state == MAIN_STATE_AUTO) {
-					/* check if AUTO mode still allowed */
-					transition_result_t res = main_state_transition(&status, MAIN_STATE_AUTO);
-
-					if (res == TRANSITION_DENIED) {
-						/* AUTO mode denied, don't try RTL, switch to failsafe state LAND */
-						res = failsafe_state_transition(&status, FAILSAFE_STATE_LAND);
-
-						if (res == TRANSITION_DENIED) {
-							/* LAND not allowed, set TERMINATION state */
-							transition_result_t res = failsafe_state_transition(&status, FAILSAFE_STATE_TERMINATION);
-						}
-					}
-
-				} else {
-					/* failsafe for manual modes */
-					transition_result_t res = failsafe_state_transition(&status, FAILSAFE_STATE_RTL);
-
-					if (res == TRANSITION_DENIED) {
-						/* RTL not allowed (no global position estimate), try LAND */
-						res = failsafe_state_transition(&status, FAILSAFE_STATE_LAND);
-
-						if (res == TRANSITION_DENIED) {
-							/* LAND not allowed, set TERMINATION state */
-							res = failsafe_state_transition(&status, FAILSAFE_STATE_TERMINATION);
-						}
-					}
-				}
-
-			} else {
-				if (status.failsafe_state != FAILSAFE_STATE_NORMAL) {
-					/* reset failsafe when disarmed */
-					transition_result_t res = failsafe_state_transition(&status, FAILSAFE_STATE_NORMAL);
-				}
+		/* data link check */
+		if (hrt_absolute_time() < telemetry.heartbeat_time + DL_TIMEOUT) {
+			/* handle the case where data link was regained */
+			if (status.data_link_lost) {
+				mavlink_log_critical(mavlink_fd, "#audio: data link regained");
+				status.data_link_lost = false;
+				status_changed = true;
 			}
-		}
 
-		// TODO remove this hack
-		/* flight termination in manual mode if assisted switch is on easy position */
-		if (!status.is_rotary_wing && parachute_enabled && armed.armed && status.main_state == MAIN_STATE_MANUAL && sp_man.assisted_switch > STICK_ON_OFF_LIMIT) {
-			if (TRANSITION_CHANGED == failsafe_state_transition(&status, FAILSAFE_STATE_TERMINATION)) {
-				tune_positive(armed.armed);
+		} else {
+			if (!status.data_link_lost) {
+				mavlink_log_critical(mavlink_fd, "#audio: CRITICAL: DATA LINK LOST");
+				status.data_link_lost = true;
+				status_changed = true;
 			}
 		}
 
@@ -1278,31 +1391,72 @@ int commander_thread_main(int argc, char *argv[])
 			orb_copy(ORB_ID(vehicle_command), cmd_sub, &cmd);
 
 			/* handle it */
-			if (handle_command(&status, &safety, &cmd, &armed))
+			if (handle_command(&status, &safety, &cmd, &armed, &home, &global_position, &home_pub)) {
 				status_changed = true;
+			}
 		}
 
-		/* check which state machines for changes, clear "changed" flag */
-		bool arming_state_changed = check_arming_state_changed();
-		bool main_state_changed = check_main_state_changed();
-		bool failsafe_state_changed = check_failsafe_state_changed();
-
 		hrt_abstime t1 = hrt_absolute_time();
 
 		/* print new state */
 		if (arming_state_changed) {
 			status_changed = true;
 			mavlink_log_info(mavlink_fd, "[cmd] arming state: %s", arming_states_str[status.arming_state]);
+
+			/* update home position on arming if at least 2s from commander start spent to avoid setting home on in-air restart */
+			if (armed.armed && !was_armed && hrt_absolute_time() > start_time + 2000000 && status.condition_global_position_valid &&
+			    (global_position.eph < eph_epv_threshold) && (global_position.epv < eph_epv_threshold)) {
+
+				// TODO remove code duplication
+				home.lat = global_position.lat;
+				home.lon = global_position.lon;
+				home.alt = global_position.alt;
+
+				home.x = local_position.x;
+				home.y = local_position.y;
+				home.z = local_position.z;
+
+				warnx("home: lat = %.7f, lon = %.7f, alt = %.2f ", home.lat, home.lon, (double)home.alt);
+				mavlink_log_info(mavlink_fd, "home: %.7f, %.7f, %.2f", home.lat, home.lon, (double)home.alt);
+
+				/* announce new home position */
+				if (home_pub > 0) {
+					orb_publish(ORB_ID(home_position), home_pub, &home);
+
+				} else {
+					home_pub = orb_advertise(ORB_ID(home_position), &home);
+				}
+
+				/* mark home position as set */
+				status.condition_home_position_valid = true;
+			}
+			arming_state_changed = false;
 		}
 
+		was_armed = armed.armed;
+
+		/* now set navigation state according to failsafe and main state */
+		bool nav_state_changed = set_nav_state(&status, (bool)datalink_loss_enabled,
+						       mission_result.mission_finished);
+
+		// TODO handle mode changes by commands
 		if (main_state_changed) {
 			status_changed = true;
+			warnx("main state: %s", main_states_str[status.main_state]);
 			mavlink_log_info(mavlink_fd, "[cmd] main state: %s", main_states_str[status.main_state]);
+			main_state_changed = false;
+		}
+
+		if (status.failsafe != failsafe_old) {
+			status_changed = true;
+			mavlink_log_info(mavlink_fd, "[cmd] failsafe state: %i", status.failsafe);
+			failsafe_old = status.failsafe;
 		}
 
-		if (failsafe_state_changed) {
+		if (nav_state_changed) {
 			status_changed = true;
-			mavlink_log_info(mavlink_fd, "[cmd] failsafe state: %s", failsafe_states_str[status.failsafe_state]);
+			warnx("nav state: %s", nav_states_str[status.nav_state]);
+			mavlink_log_info(mavlink_fd, "[cmd] nav state: %s", nav_states_str[status.nav_state]);
 		}
 
 		/* publish states (armed, control mode, vehicle status) at least with 5 Hz */
@@ -1328,7 +1482,7 @@ int commander_thread_main(int argc, char *argv[])
 			/* play tune on battery critical */
 			set_tune(TONE_BATTERY_WARNING_FAST_TUNE);
 
-		} else if (status.battery_warning == VEHICLE_BATTERY_WARNING_LOW || status.failsafe_state != FAILSAFE_STATE_NORMAL) {
+		} else if (status.battery_warning == VEHICLE_BATTERY_WARNING_LOW || status.failsafe) {
 			/* play tune on battery warning or failsafe */
 			set_tune(TONE_BATTERY_WARNING_SLOW_TUNE);
 
@@ -1432,7 +1586,7 @@ control_status_leds(vehicle_status_s *status, const actuator_armed_s *actuator_a
 
 		if (set_normal_color) {
 			/* set color */
-			if (status->battery_warning == VEHICLE_BATTERY_WARNING_LOW || status->failsafe_state != FAILSAFE_STATE_NORMAL) {
+			if (status->battery_warning == VEHICLE_BATTERY_WARNING_LOW || status->failsafe) {
 				rgbled_set_color(RGBLED_COLOR_AMBER);
 				/* VEHICLE_BATTERY_WARNING_CRITICAL handled as ARMING_STATE_ARMED_ERROR / ARMING_STATE_STANDBY_ERROR */
 
@@ -1456,21 +1610,24 @@ control_status_leds(vehicle_status_s *status, const actuator_armed_s *actuator_a
 
 	} else if (actuator_armed->ready_to_arm) {
 		/* ready to arm, blink at 1Hz */
-		if (leds_counter % 20 == 0)
+		if (leds_counter % 20 == 0) {
 			led_toggle(LED_BLUE);
+		}
 
 	} else {
 		/* not ready to arm, blink at 10Hz */
-		if (leds_counter % 2 == 0)
+		if (leds_counter % 2 == 0) {
 			led_toggle(LED_BLUE);
+		}
 	}
 
 #endif
 
 	/* give system warnings on error LED, XXX maybe add memory usage warning too */
 	if (status->load > 0.95f) {
-		if (leds_counter % 2 == 0)
+		if (leds_counter % 2 == 0) {
 			led_toggle(LED_AMBER);
+		}
 
 	} else {
 		led_off(LED_AMBER);
@@ -1479,108 +1636,105 @@ control_status_leds(vehicle_status_s *status, const actuator_armed_s *actuator_a
 	leds_counter++;
 }
 
-void
-check_mode_switches(struct manual_control_setpoint_s *sp_man, struct vehicle_status_s *status)
+transition_result_t
+set_main_state_rc(struct vehicle_status_s *status, struct manual_control_setpoint_s *sp_man)
 {
-	/* main mode switch */
-	if (!isfinite(sp_man->mode_switch)) {
-		/* default to manual if signal is invalid */
-		status->mode_switch = MODE_SWITCH_MANUAL;
-
-	} else if (sp_man->mode_switch > STICK_ON_OFF_LIMIT) {
-		status->mode_switch = MODE_SWITCH_AUTO;
-
-	} else if (sp_man->mode_switch < -STICK_ON_OFF_LIMIT) {
-		status->mode_switch = MODE_SWITCH_MANUAL;
-
-	} else {
-		status->mode_switch = MODE_SWITCH_ASSISTED;
-	}
-
-	/* return switch */
-	if (!isfinite(sp_man->return_switch)) {
-		status->return_switch = RETURN_SWITCH_NONE;
+	/* set main state according to RC switches */
+	transition_result_t res = TRANSITION_DENIED;
 
-	} else if (sp_man->return_switch > STICK_ON_OFF_LIMIT) {
-		status->return_switch = RETURN_SWITCH_RETURN;
+	switch (sp_man->mode_switch) {
+	case SWITCH_POS_NONE:
+		res = TRANSITION_NOT_CHANGED;
+		break;
 
-	} else {
-		status->return_switch = RETURN_SWITCH_NORMAL;
-	}
+	case SWITCH_POS_OFF:		// MANUAL
+		if (sp_man->acro_switch == SWITCH_POS_ON) {
+			res = main_state_transition(status, MAIN_STATE_ACRO);
 
-	/* assisted switch */
-	if (!isfinite(sp_man->assisted_switch)) {
-		status->assisted_switch = ASSISTED_SWITCH_SEATBELT;
+		} else {
+			res = main_state_transition(status, MAIN_STATE_MANUAL);
+		}
+		// TRANSITION_DENIED is not possible here
+		break;
 
-	} else if (sp_man->assisted_switch > STICK_ON_OFF_LIMIT) {
-		status->assisted_switch = ASSISTED_SWITCH_EASY;
+	case SWITCH_POS_MIDDLE:		// ASSIST
+		if (sp_man->posctl_switch == SWITCH_POS_ON) {
+			res = main_state_transition(status, MAIN_STATE_POSCTL);
 
-	} else {
-		status->assisted_switch = ASSISTED_SWITCH_SEATBELT;
-	}
+			if (res != TRANSITION_DENIED) {
+				break;	// changed successfully or already in this state
+			}
 
-	/* mission switch  */
-	if (!isfinite(sp_man->mission_switch)) {
-		status->mission_switch = MISSION_SWITCH_NONE;
+			print_reject_mode(status, "POSCTL");
+		}
 
-	} else if (sp_man->mission_switch > STICK_ON_OFF_LIMIT) {
-		status->mission_switch = MISSION_SWITCH_LOITER;
+        // fallback to ALTCTL
+		res = main_state_transition(status, MAIN_STATE_ALTCTL);
 
-	} else {
-		status->mission_switch = MISSION_SWITCH_MISSION;
-	}
-}
+		if (res != TRANSITION_DENIED) {
+			break;	// changed successfully or already in this mode
+		}
 
-transition_result_t
-set_main_state_rc(struct vehicle_status_s *status)
-{
-	/* set main state according to RC switches */
-	transition_result_t res = TRANSITION_DENIED;
+		if (sp_man->posctl_switch != SWITCH_POS_ON) {
+			print_reject_mode(status, "ALTCTL");
+		}
 
-	switch (status->mode_switch) {
-	case MODE_SWITCH_MANUAL:
+		// fallback to MANUAL
 		res = main_state_transition(status, MAIN_STATE_MANUAL);
 		// TRANSITION_DENIED is not possible here
 		break;
 
-	case MODE_SWITCH_ASSISTED:
-		if (status->assisted_switch == ASSISTED_SWITCH_EASY) {
-			res = main_state_transition(status, MAIN_STATE_EASY);
+	case SWITCH_POS_ON:			// AUTO
+		if (sp_man->return_switch == SWITCH_POS_ON) {
+			res = main_state_transition(status, MAIN_STATE_AUTO_RTL);
 
-			if (res != TRANSITION_DENIED)
+			if (res != TRANSITION_DENIED) {
 				break;	// changed successfully or already in this state
+			}
 
-			// else fallback to SEATBELT
-			print_reject_mode(status, "EASY");
-		}
+            print_reject_mode(status, "AUTO_RTL");
 
-		res = main_state_transition(status, MAIN_STATE_SEATBELT);
+            // fallback to LOITER if home position not set
+            res = main_state_transition(status, MAIN_STATE_AUTO_LOITER);
 
-		if (res != TRANSITION_DENIED)
-			break;	// changed successfully or already in this mode
+            if (res != TRANSITION_DENIED) {
+                break;  // changed successfully or already in this state
+            }
 
-		if (status->assisted_switch != ASSISTED_SWITCH_EASY)	// don't print both messages
-			print_reject_mode(status, "SEATBELT");
+		} else if (sp_man->loiter_switch == SWITCH_POS_ON) {
+			res = main_state_transition(status, MAIN_STATE_AUTO_LOITER);
 
-		// else fallback to MANUAL
-		res = main_state_transition(status, MAIN_STATE_MANUAL);
-		// TRANSITION_DENIED is not possible here
-		break;
+			if (res != TRANSITION_DENIED) {
+				break;	// changed successfully or already in this state
+			}
 
-	case MODE_SWITCH_AUTO:
-		res = main_state_transition(status, MAIN_STATE_AUTO);
+            print_reject_mode(status, "AUTO_LOITER");
 
-		if (res != TRANSITION_DENIED)
-			break;	// changed successfully or already in this state
+		} else {
+			res = main_state_transition(status, MAIN_STATE_AUTO_MISSION);
+
+			if (res != TRANSITION_DENIED) {
+				break;	// changed successfully or already in this state
+			}
+
+            print_reject_mode(status, "AUTO_MISSION");
+		}
+
+        // fallback to POSCTL
+        res = main_state_transition(status, MAIN_STATE_POSCTL);
 
-		// else fallback to SEATBELT (EASY likely will not work too)
-		print_reject_mode(status, "AUTO");
-		res = main_state_transition(status, MAIN_STATE_SEATBELT);
+        if (res != TRANSITION_DENIED) {
+            break;  // changed successfully or already in this state
+        }
 
-		if (res != TRANSITION_DENIED)
+		// fallback to ALTCTL
+		res = main_state_transition(status, MAIN_STATE_ALTCTL);
+
+		if (res != TRANSITION_DENIED) {
 			break;	// changed successfully or already in this state
+		}
 
-		// else fallback to MANUAL
+		// fallback to MANUAL
 		res = main_state_transition(status, MAIN_STATE_MANUAL);
 		// TRANSITION_DENIED is not possible here
 		break;
@@ -1593,73 +1747,92 @@ set_main_state_rc(struct vehicle_status_s *status)
 }
 
 void
-
 set_control_mode()
 {
-	/* set vehicle_control_mode according to main state and failsafe state */
+	/* set vehicle_control_mode according to set_navigation_state */
 	control_mode.flag_armed = armed.armed;
+	/* TODO: check this */
 	control_mode.flag_external_manual_override_ok = !status.is_rotary_wing;
 	control_mode.flag_system_hil_enabled = status.hil_state == HIL_STATE_ON;
 
-	control_mode.flag_control_termination_enabled = false;
-
-	/* set this flag when navigator should act */
-	bool navigator_enabled = false;
-
-	switch (status.failsafe_state) {
-	case FAILSAFE_STATE_NORMAL:
-		switch (status.main_state) {
-		case MAIN_STATE_MANUAL:
-			control_mode.flag_control_manual_enabled = true;
-			control_mode.flag_control_auto_enabled = false;
-			control_mode.flag_control_rates_enabled = status.is_rotary_wing;
-			control_mode.flag_control_attitude_enabled = status.is_rotary_wing;
-			control_mode.flag_control_altitude_enabled = false;
-			control_mode.flag_control_climb_rate_enabled = false;
-			control_mode.flag_control_position_enabled = false;
-			control_mode.flag_control_velocity_enabled = false;
-			break;
-
-		case MAIN_STATE_SEATBELT:
-			control_mode.flag_control_manual_enabled = true;
-			control_mode.flag_control_auto_enabled = false;
-			control_mode.flag_control_rates_enabled = true;
-			control_mode.flag_control_attitude_enabled = true;
-			control_mode.flag_control_altitude_enabled = true;
-			control_mode.flag_control_climb_rate_enabled = true;
-			control_mode.flag_control_position_enabled = false;
-			control_mode.flag_control_velocity_enabled = false;
-			break;
-
-		case MAIN_STATE_EASY:
-			control_mode.flag_control_manual_enabled = true;
-			control_mode.flag_control_auto_enabled = false;
-			control_mode.flag_control_rates_enabled = true;
-			control_mode.flag_control_attitude_enabled = true;
-			control_mode.flag_control_altitude_enabled = true;
-			control_mode.flag_control_climb_rate_enabled = true;
-			control_mode.flag_control_position_enabled = true;
-			control_mode.flag_control_velocity_enabled = true;
-			break;
+	switch (status.nav_state) {
+	case NAVIGATION_STATE_MANUAL:
+		control_mode.flag_control_manual_enabled = true;
+		control_mode.flag_control_auto_enabled = false;
+		control_mode.flag_control_rates_enabled = status.is_rotary_wing;
+		control_mode.flag_control_attitude_enabled = status.is_rotary_wing;
+		control_mode.flag_control_altitude_enabled = false;
+		control_mode.flag_control_climb_rate_enabled = false;
+		control_mode.flag_control_position_enabled = false;
+		control_mode.flag_control_velocity_enabled = false;
+		control_mode.flag_control_termination_enabled = false;
+		break;
 
-		case MAIN_STATE_AUTO:
-			navigator_enabled = true;
+	case NAVIGATION_STATE_ACRO:
+		control_mode.flag_control_manual_enabled = true;
+		control_mode.flag_control_auto_enabled = false;
+		control_mode.flag_control_rates_enabled = true;
+		control_mode.flag_control_attitude_enabled = false;
+		control_mode.flag_control_altitude_enabled = false;
+		control_mode.flag_control_climb_rate_enabled = false;
+		control_mode.flag_control_position_enabled = false;
+		control_mode.flag_control_velocity_enabled = false;
+		control_mode.flag_control_termination_enabled = false;
+		break;
 
-		default:
-			break;
-		}
+	case NAVIGATION_STATE_ALTCTL:
+		control_mode.flag_control_manual_enabled = true;
+		control_mode.flag_control_auto_enabled = false;
+		control_mode.flag_control_rates_enabled = true;
+		control_mode.flag_control_attitude_enabled = true;
+		control_mode.flag_control_altitude_enabled = true;
+		control_mode.flag_control_climb_rate_enabled = true;
+		control_mode.flag_control_position_enabled = false;
+		control_mode.flag_control_velocity_enabled = false;
+		control_mode.flag_control_termination_enabled = false;
+		break;
 
+	case NAVIGATION_STATE_POSCTL:
+		control_mode.flag_control_manual_enabled = true;
+		control_mode.flag_control_auto_enabled = false;
+		control_mode.flag_control_rates_enabled = true;
+		control_mode.flag_control_attitude_enabled = true;
+		control_mode.flag_control_altitude_enabled = true;
+		control_mode.flag_control_climb_rate_enabled = true;
+		control_mode.flag_control_position_enabled = true;
+		control_mode.flag_control_velocity_enabled = true;
+		control_mode.flag_control_termination_enabled = false;
 		break;
 
-	case FAILSAFE_STATE_RTL:
-		navigator_enabled = true;
+	case NAVIGATION_STATE_AUTO_MISSION:
+	case NAVIGATION_STATE_AUTO_LOITER:
+	case NAVIGATION_STATE_AUTO_RTL:
+	case NAVIGATION_STATE_AUTO_RTGS:
+		control_mode.flag_control_manual_enabled = false;
+		control_mode.flag_control_auto_enabled = true;
+		control_mode.flag_control_rates_enabled = true;
+		control_mode.flag_control_attitude_enabled = true;
+		control_mode.flag_control_altitude_enabled = true;
+		control_mode.flag_control_climb_rate_enabled = true;
+		control_mode.flag_control_position_enabled = true;
+		control_mode.flag_control_velocity_enabled = true;
+		control_mode.flag_control_termination_enabled = false;
 		break;
 
-	case FAILSAFE_STATE_LAND:
-		navigator_enabled = true;
+	case NAVIGATION_STATE_LAND:
+		control_mode.flag_control_manual_enabled = false;
+		control_mode.flag_control_auto_enabled = true;
+		control_mode.flag_control_rates_enabled = true;
+		control_mode.flag_control_attitude_enabled = true;
+		/* in failsafe LAND mode position may be not available */
+		control_mode.flag_control_position_enabled = status.condition_local_position_valid;
+		control_mode.flag_control_velocity_enabled = status.condition_local_position_valid;
+		control_mode.flag_control_altitude_enabled = true;
+		control_mode.flag_control_climb_rate_enabled = true;
+		control_mode.flag_control_termination_enabled = false;
 		break;
 
-	case FAILSAFE_STATE_TERMINATION:
+	case NAVIGATION_STATE_TERMINATION:
 		/* disable all controllers on termination */
 		control_mode.flag_control_manual_enabled = false;
 		control_mode.flag_control_auto_enabled = false;
@@ -1675,18 +1848,6 @@ set_control_mode()
 	default:
 		break;
 	}
-
-	/* navigator has control, set control mode flags according to nav state*/
-	if (navigator_enabled) {
-		control_mode.flag_control_manual_enabled = false;
-		control_mode.flag_control_auto_enabled = true;
-		control_mode.flag_control_rates_enabled = true;
-		control_mode.flag_control_attitude_enabled = true;
-		control_mode.flag_control_position_enabled = true;
-		control_mode.flag_control_velocity_enabled = true;
-		control_mode.flag_control_altitude_enabled = true;
-		control_mode.flag_control_climb_rate_enabled = true;
-	}
 }
 
 void
@@ -1724,7 +1885,7 @@ void answer_command(struct vehicle_command_s &cmd, enum VEHICLE_CMD_RESULT resul
 {
 	switch (result) {
 	case VEHICLE_CMD_RESULT_ACCEPTED:
-			tune_positive(true);
+		tune_positive(true);
 		break;
 
 	case VEHICLE_CMD_RESULT_DENIED:
@@ -1738,7 +1899,8 @@ void answer_command(struct vehicle_command_s &cmd, enum VEHICLE_CMD_RESULT resul
 		break;
 
 	case VEHICLE_CMD_RESULT_TEMPORARILY_REJECTED:
-		mavlink_log_critical(mavlink_fd, "#audio: command temporarily rejected: %u", cmd.command);
+		/* this needs additional hints to the user - so let other messages pass and be spoken */
+		mavlink_log_critical(mavlink_fd, "command temporarily rejected: %u", cmd.command);
 		tune_negative(true);
 		break;
 
@@ -1774,8 +1936,9 @@ void *commander_low_prio_loop(void *arg)
 		int pret = poll(&fds[0], (sizeof(fds) / sizeof(fds[0])), 200);
 
 		/* timed out - periodic check for thread_should_exit, etc. */
-		if (pret == 0)
+		if (pret == 0) {
 			continue;
+		}
 
 		/* this is undesirable but not much we can do - might want to flag unhappy status */
 		if (pret < 0) {
@@ -1790,8 +1953,9 @@ void *commander_low_prio_loop(void *arg)
 		if (cmd.command == VEHICLE_CMD_DO_SET_MODE ||
 		    cmd.command == VEHICLE_CMD_COMPONENT_ARM_DISARM ||
 		    cmd.command == VEHICLE_CMD_NAV_TAKEOFF ||
-		    cmd.command == VEHICLE_CMD_DO_SET_SERVO)
+		    cmd.command == VEHICLE_CMD_DO_SET_SERVO) {
 			continue;
+		}
 
 		/* only handle low-priority commands here */
 		switch (cmd.command) {
@@ -1826,9 +1990,7 @@ void *commander_low_prio_loop(void *arg)
 				int calib_ret = ERROR;
 
 				/* try to go to INIT/PREFLIGHT arming state */
-
-				// XXX disable interrupts in arming_state_transition
-				if (TRANSITION_DENIED == arming_state_transition(&status, &safety, ARMING_STATE_INIT, &armed)) {
+				if (TRANSITION_DENIED == arming_state_transition(&status, &safety, ARMING_STATE_INIT, &armed, mavlink_fd)) {
 					answer_command(cmd, VEHICLE_CMD_RESULT_DENIED);
 					break;
 				}
@@ -1869,6 +2031,7 @@ void *commander_low_prio_loop(void *arg)
 					/* airspeed calibration */
 					answer_command(cmd, VEHICLE_CMD_RESULT_ACCEPTED);
 					calib_ret = do_airspeed_calibration(mavlink_fd);
+
 				} else if ((int)(cmd.param4) == 0) {
 					/* RC calibration ended - have we been in one worth confirming? */
 					if (status.rc_input_blocked) {
@@ -1883,12 +2046,14 @@ void *commander_low_prio_loop(void *arg)
 
 				}
 
-				if (calib_ret == OK)
+				if (calib_ret == OK) {
 					tune_positive(true);
-				else
+
+				} else {
 					tune_negative(true);
+				}
 
-				arming_state_transition(&status, &safety, ARMING_STATE_STANDBY, &armed);
+				arming_state_transition(&status, &safety, ARMING_STATE_STANDBY, &armed, mavlink_fd);
 
 				break;
 			}
@@ -1906,11 +2071,13 @@ void *commander_low_prio_loop(void *arg)
 						mavlink_log_critical(mavlink_fd, "#audio: parameters load ERROR");
 
 						/* convenience as many parts of NuttX use negative errno */
-						if (ret < 0)
+						if (ret < 0) {
 							ret = -ret;
+						}
 
-						if (ret < 1000)
+						if (ret < 1000) {
 							mavlink_log_critical(mavlink_fd, "#audio: %s", strerror(ret));
+						}
 
 						answer_command(cmd, VEHICLE_CMD_RESULT_FAILED);
 					}
@@ -1926,11 +2093,13 @@ void *commander_low_prio_loop(void *arg)
 						mavlink_log_critical(mavlink_fd, "#audio: parameters save error");
 
 						/* convenience as many parts of NuttX use negative errno */
-						if (ret < 0)
+						if (ret < 0) {
 							ret = -ret;
+						}
 
-						if (ret < 1000)
+						if (ret < 1000) {
 							mavlink_log_critical(mavlink_fd, "#audio: %s", strerror(ret));
+						}
 
 						answer_command(cmd, VEHICLE_CMD_RESULT_FAILED);
 					}
@@ -1940,8 +2109,8 @@ void *commander_low_prio_loop(void *arg)
 			}
 
 		case VEHICLE_CMD_START_RX_PAIR:
-		/* handled in the IO driver */
-		break;
+			/* handled in the IO driver */
+			break;
 
 		default:
 			/* don't answer on unsupported commands, it will be done in main loop */
diff --git a/src/modules/commander/commander_helper.cpp b/src/modules/commander/commander_helper.cpp
index fe6c9bfaa..80e6861f6 100644
--- a/src/modules/commander/commander_helper.cpp
+++ b/src/modules/commander/commander_helper.cpp
@@ -113,17 +113,22 @@ void buzzer_deinit()
 	close(buzzer);
 }
 
-void set_tune(int tune) {
+void set_tune(int tune)
+{
 	unsigned int new_tune_duration = tune_durations[tune];
+
 	/* don't interrupt currently playing non-repeating tune by repeating */
 	if (tune_end == 0 || new_tune_duration != 0 || hrt_absolute_time() > tune_end) {
 		/* allow interrupting current non-repeating tune by the same tune */
 		if (tune != tune_current || new_tune_duration != 0) {
 			ioctl(buzzer, TONE_SET_ALARM, tune);
 		}
+
 		tune_current = tune;
+
 		if (new_tune_duration != 0) {
 			tune_end = hrt_absolute_time() + new_tune_duration;
+
 		} else {
 			tune_end = 0;
 		}
@@ -138,6 +143,7 @@ void tune_positive(bool use_buzzer)
 	blink_msg_end = hrt_absolute_time() + BLINK_MSG_TIME;
 	rgbled_set_color(RGBLED_COLOR_GREEN);
 	rgbled_set_mode(RGBLED_MODE_BLINK_FAST);
+
 	if (use_buzzer) {
 		set_tune(TONE_NOTIFY_POSITIVE_TUNE);
 	}
@@ -151,6 +157,7 @@ void tune_neutral(bool use_buzzer)
 	blink_msg_end = hrt_absolute_time() + BLINK_MSG_TIME;
 	rgbled_set_color(RGBLED_COLOR_WHITE);
 	rgbled_set_mode(RGBLED_MODE_BLINK_FAST);
+
 	if (use_buzzer) {
 		set_tune(TONE_NOTIFY_NEUTRAL_TUNE);
 	}
@@ -164,6 +171,7 @@ void tune_negative(bool use_buzzer)
 	blink_msg_end = hrt_absolute_time() + BLINK_MSG_TIME;
 	rgbled_set_color(RGBLED_COLOR_RED);
 	rgbled_set_mode(RGBLED_MODE_BLINK_FAST);
+
 	if (use_buzzer) {
 		set_tune(TONE_NOTIFY_NEGATIVE_TUNE);
 	}
@@ -198,30 +206,26 @@ int led_init()
 		return ERROR;
 	}
 
-	/* the blue LED is only available on FMUv1 but not FMUv2 */
-#ifdef CONFIG_ARCH_BOARD_PX4FMU_V1
+	/* the blue LED is only available on FMUv1 & AeroCore but not FMUv2 */
+	(void)ioctl(leds, LED_ON, LED_BLUE);
 
-	if (ioctl(leds, LED_ON, LED_BLUE)) {
-		warnx("Blue LED: ioctl fail\n");
-		return ERROR;
-	}
-
-#endif
+	/* switch blue off */
+	led_off(LED_BLUE);
 
+	/* we consider the amber led mandatory */
 	if (ioctl(leds, LED_ON, LED_AMBER)) {
 		warnx("Amber LED: ioctl fail\n");
 		return ERROR;
 	}
 
+	/* switch amber off */
+	led_off(LED_AMBER);
+
 	/* then try RGB LEDs, this can fail on FMUv1*/
 	rgbleds = open(RGBLED_DEVICE_PATH, 0);
 
 	if (rgbleds == -1) {
-#ifdef CONFIG_ARCH_BOARD_PX4FMU_V2
-		errx(1, "Unable to open " RGBLED_DEVICE_PATH);
-#else
-		warnx("No RGB LED found");
-#endif
+		warnx("No RGB LED found at " RGBLED_DEVICE_PATH);
 	}
 
 	return 0;
@@ -254,22 +258,25 @@ int led_off(int led)
 void rgbled_set_color(rgbled_color_t color)
 {
 
-	if (rgbleds != -1)
+	if (rgbleds != -1) {
 		ioctl(rgbleds, RGBLED_SET_COLOR, (unsigned long)color);
+	}
 }
 
 void rgbled_set_mode(rgbled_mode_t mode)
 {
 
-	if (rgbleds != -1)
+	if (rgbleds != -1) {
 		ioctl(rgbleds, RGBLED_SET_MODE, (unsigned long)mode);
+	}
 }
 
 void rgbled_set_pattern(rgbled_pattern_t *pattern)
 {
 
-	if (rgbleds != -1)
+	if (rgbleds != -1) {
 		ioctl(rgbleds, RGBLED_SET_PATTERN, (unsigned long)pattern);
+	}
 }
 
 float battery_remaining_estimate_voltage(float voltage, float discharged)
@@ -309,6 +316,7 @@ float battery_remaining_estimate_voltage(float voltage, float discharged)
 	if (bat_capacity > 0.0f) {
 		/* if battery capacity is known, use discharged current for estimate, but don't show more than voltage estimate */
 		ret = fminf(remaining_voltage, 1.0f - discharged / bat_capacity);
+
 	} else {
 		/* else use voltage */
 		ret = remaining_voltage;
diff --git a/src/modules/commander/commander_params.c b/src/modules/commander/commander_params.c
index 80ca68f21..4750f9d5c 100644
--- a/src/modules/commander/commander_params.c
+++ b/src/modules/commander/commander_params.c
@@ -39,7 +39,7 @@
  *
  * @author Lorenz Meier <lm@inf.ethz.ch>
  * @author Thomas Gubler <thomasgubler@student.ethz.ch>
- * @author Julian Oes <joes@student.ethz.ch>
+ * @author Julian Oes <julian@oes.ch>
  */
 
 #include <nuttx/config.h>
@@ -84,3 +84,14 @@ PARAM_DEFINE_INT32(BAT_N_CELLS, 3);
  * @group Battery Calibration
  */
 PARAM_DEFINE_FLOAT(BAT_CAPACITY, -1.0f);
+
+/**
+ * Datalink loss mode enabled.
+ *
+ * Set to 1 to enable actions triggered when the datalink is lost.
+ *
+ * @group commander
+ * @min 0
+ * @max 1
+ */
+PARAM_DEFINE_INT32(COM_DL_LOSS_EN, 0);
diff --git a/src/modules/commander/commander_tests/commander_tests.cpp b/src/modules/commander/commander_tests/commander_tests.cpp
index 6e72cf0d9..0abb84a82 100644
--- a/src/modules/commander/commander_tests/commander_tests.cpp
+++ b/src/modules/commander/commander_tests/commander_tests.cpp
@@ -48,8 +48,7 @@ extern "C" __EXPORT int commander_tests_main(int argc, char *argv[]);
 
 int commander_tests_main(int argc, char *argv[])
 {
-	state_machine_helper_test();
-	//state_machine_test();
+	stateMachineHelperTest();
 
 	return 0;
 }
diff --git a/src/modules/commander/commander_tests/state_machine_helper_test.cpp b/src/modules/commander/commander_tests/state_machine_helper_test.cpp
index 40bedd9f3..ee0d08391 100644
--- a/src/modules/commander/commander_tests/state_machine_helper_test.cpp
+++ b/src/modules/commander/commander_tests/state_machine_helper_test.cpp
@@ -49,13 +49,12 @@ public:
 	StateMachineHelperTest();
 	virtual ~StateMachineHelperTest();
 
-	virtual const char*	run_tests();
+	virtual void runTests(void);
 
 private:
-	const char*	arming_state_transition_test();
-	const char*	arming_state_transition_arm_disarm_test();
-	const char*	main_state_transition_test();
-	const char*	is_safe_test();
+	bool armingStateTransitionTest();
+	bool mainStateTransitionTest();
+	bool isSafeTest();
 };
 
 StateMachineHelperTest::StateMachineHelperTest() {
@@ -64,61 +63,242 @@ StateMachineHelperTest::StateMachineHelperTest() {
 StateMachineHelperTest::~StateMachineHelperTest() {
 }
 
-const char*
-StateMachineHelperTest::arming_state_transition_test()
+bool StateMachineHelperTest::armingStateTransitionTest(void)
 {
+    // These are the critical values from vehicle_status_s and actuator_armed_s which must be primed
+    // to simulate machine state prior to testing an arming state transition. This structure is also
+    // use to represent the expected machine state after the transition has been requested.
+    typedef struct {
+        arming_state_t  arming_state;   // vehicle_status_s.arming_state
+        bool            armed;          // actuator_armed_s.armed
+        bool            ready_to_arm;   // actuator_armed_s.ready_to_arm
+    } ArmingTransitionVolatileState_t;
+    
+    // This structure represents a test case for arming_state_transition. It contains the machine
+    // state prior to transtion, the requested state to transition to and finally the expected
+    // machine state after transition.
+    typedef struct {
+        const char*                     assertMsg;                              // Text to show when test case fails
+        ArmingTransitionVolatileState_t current_state;                          // Machine state prior to transtion
+        hil_state_t                     hil_state;                              // Current vehicle_status_s.hil_state
+        bool                            condition_system_sensors_initialized;   // Current vehicle_status_s.condition_system_sensors_initialized
+        bool                            safety_switch_available;                // Current safety_s.safety_switch_available
+        bool                            safety_off;                             // Current safety_s.safety_off
+        arming_state_t                  requested_state;                        // Requested arming state to transition to
+        ArmingTransitionVolatileState_t expected_state;                         // Expected machine state after transition
+        transition_result_t             expected_transition_result;             // Expected result from arming_state_transition
+    } ArmingTransitionTest_t;
+    
+    // We use these defines so that our test cases are more readable
+    #define ATT_ARMED true
+    #define ATT_DISARMED false
+    #define ATT_READY_TO_ARM true
+    #define ATT_NOT_READY_TO_ARM false
+    #define ATT_SENSORS_INITIALIZED true
+    #define ATT_SENSORS_NOT_INITIALIZED false
+    #define ATT_SAFETY_AVAILABLE true
+    #define ATT_SAFETY_NOT_AVAILABLE true
+    #define ATT_SAFETY_OFF true
+    #define ATT_SAFETY_ON false
+    
+    // These are test cases for arming_state_transition
+    static const ArmingTransitionTest_t rgArmingTransitionTests[] = {
+        // TRANSITION_NOT_CHANGED tests
+        
+        { "no transition: identical states",
+            { ARMING_STATE_INIT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_INIT,
+            { ARMING_STATE_INIT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_NOT_CHANGED },
+        
+        // TRANSITION_CHANGED tests
+        
+        // Check all basic valid transitions, these don't require special state in vehicle_status_t or safety_s
+        
+        { "transition: init to standby",
+            { ARMING_STATE_INIT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_STANDBY,
+            { ARMING_STATE_STANDBY, ATT_DISARMED, ATT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        { "transition: init to standby error",
+            { ARMING_STATE_INIT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_STANDBY_ERROR,
+            { ARMING_STATE_STANDBY_ERROR, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        { "transition: init to reboot",
+            { ARMING_STATE_INIT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_REBOOT,
+            { ARMING_STATE_REBOOT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        { "transition: standby to init",
+            { ARMING_STATE_STANDBY, ATT_DISARMED, ATT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_INIT,
+            { ARMING_STATE_INIT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        { "transition: standby to standby error",
+            { ARMING_STATE_STANDBY, ATT_DISARMED, ATT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_STANDBY_ERROR,
+            { ARMING_STATE_STANDBY_ERROR, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        { "transition: standby to reboot",
+            { ARMING_STATE_STANDBY, ATT_DISARMED, ATT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_REBOOT,
+            { ARMING_STATE_REBOOT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        { "transition: armed to standby",
+            { ARMING_STATE_ARMED, ATT_ARMED, ATT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_STANDBY,
+            { ARMING_STATE_STANDBY, ATT_DISARMED, ATT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        { "transition: armed to armed error",
+            { ARMING_STATE_ARMED, ATT_ARMED, ATT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_ARMED_ERROR,
+            { ARMING_STATE_ARMED_ERROR, ATT_ARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        { "transition: armed error to standby error",
+            { ARMING_STATE_ARMED_ERROR, ATT_ARMED, ATT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_STANDBY_ERROR,
+            { ARMING_STATE_STANDBY_ERROR, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        { "transition: standby error to reboot",
+            { ARMING_STATE_STANDBY_ERROR, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_REBOOT,
+            { ARMING_STATE_REBOOT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        { "transition: in air restore to armed",
+            { ARMING_STATE_IN_AIR_RESTORE, ATT_DISARMED, ATT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_ARMED,
+            { ARMING_STATE_ARMED, ATT_ARMED, ATT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        { "transition: in air restore to reboot",
+            { ARMING_STATE_IN_AIR_RESTORE, ATT_DISARMED, ATT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_REBOOT,
+            { ARMING_STATE_REBOOT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        // hil on tests, standby error to standby not normally allowed
+        
+        { "transition: standby error to standby, hil on",
+            { ARMING_STATE_STANDBY_ERROR, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, HIL_STATE_ON, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_STANDBY,
+            { ARMING_STATE_STANDBY, ATT_DISARMED, ATT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        // Safety switch arming tests
+        
+        { "transition: init to standby, no safety switch",
+            { ARMING_STATE_STANDBY, ATT_DISARMED, ATT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_NOT_AVAILABLE, ATT_SAFETY_OFF,
+            ARMING_STATE_ARMED,
+            { ARMING_STATE_ARMED, ATT_ARMED, ATT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        { "transition: init to standby, safety switch off",
+            { ARMING_STATE_STANDBY, ATT_DISARMED, ATT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_OFF,
+            ARMING_STATE_ARMED,
+            { ARMING_STATE_ARMED, ATT_ARMED, ATT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        // standby error
+        { "transition: armed error to standby error requested standby",
+            { ARMING_STATE_ARMED_ERROR, ATT_ARMED, ATT_NOT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_STANDBY,
+            { ARMING_STATE_STANDBY_ERROR, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_CHANGED },
+        
+        // TRANSITION_DENIED tests
+        
+        // Check some important basic invalid transitions, these don't require special state in vehicle_status_t or safety_s
+        
+        { "no transition: init to armed",
+            { ARMING_STATE_INIT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_ARMED,
+            { ARMING_STATE_INIT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_DENIED },
+        
+        { "no transition: standby to armed error",
+            { ARMING_STATE_STANDBY, ATT_DISARMED, ATT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_ARMED_ERROR,
+            { ARMING_STATE_STANDBY, ATT_DISARMED, ATT_READY_TO_ARM }, TRANSITION_DENIED },
+        
+        { "no transition: armed to init",
+            { ARMING_STATE_ARMED, ATT_ARMED, ATT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_INIT,
+            { ARMING_STATE_ARMED, ATT_ARMED, ATT_READY_TO_ARM }, TRANSITION_DENIED },
+        
+        { "no transition: armed to reboot",
+            { ARMING_STATE_ARMED, ATT_ARMED, ATT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_REBOOT,
+            { ARMING_STATE_ARMED, ATT_ARMED, ATT_READY_TO_ARM }, TRANSITION_DENIED },
+        
+        { "no transition: armed error to armed",
+            { ARMING_STATE_ARMED_ERROR, ATT_ARMED, ATT_NOT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_ARMED,
+            { ARMING_STATE_ARMED_ERROR, ATT_ARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_DENIED },
+        
+        { "no transition: armed error to reboot",
+            { ARMING_STATE_ARMED_ERROR, ATT_ARMED, ATT_NOT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_REBOOT,
+            { ARMING_STATE_ARMED_ERROR, ATT_ARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_DENIED },
+        
+        { "no transition: standby error to armed",
+            { ARMING_STATE_STANDBY_ERROR, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_ARMED,
+            { ARMING_STATE_STANDBY_ERROR, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_DENIED },
+        
+        { "no transition: standby error to standby",
+            { ARMING_STATE_STANDBY_ERROR, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_STANDBY,
+            { ARMING_STATE_STANDBY_ERROR, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_DENIED },
+        
+        { "no transition: reboot to armed",
+            { ARMING_STATE_REBOOT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_ARMED,
+            { ARMING_STATE_REBOOT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_DENIED },
+        
+        { "no transition: in air restore to standby",
+            { ARMING_STATE_IN_AIR_RESTORE, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_STANDBY,
+            { ARMING_STATE_IN_AIR_RESTORE, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_DENIED },
+        
+        // Sensor tests
+        
+        { "no transition: init to standby - sensors not initialized",
+            { ARMING_STATE_INIT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_NOT_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_STANDBY,
+            { ARMING_STATE_INIT, ATT_DISARMED, ATT_NOT_READY_TO_ARM }, TRANSITION_DENIED },
+        
+        // Safety switch arming tests
+        
+        { "no transition: init to standby, safety switch on",
+            { ARMING_STATE_STANDBY, ATT_DISARMED, ATT_READY_TO_ARM }, HIL_STATE_OFF, ATT_SENSORS_INITIALIZED, ATT_SAFETY_AVAILABLE, ATT_SAFETY_ON,
+            ARMING_STATE_ARMED,
+            { ARMING_STATE_STANDBY, ATT_DISARMED, ATT_READY_TO_ARM }, TRANSITION_DENIED },
+    };
+    
 	struct vehicle_status_s status;
-	struct safety_s safety;
-	arming_state_t new_arming_state;
-	struct actuator_armed_s armed;
-
-	// Identical states.
-	status.arming_state = ARMING_STATE_INIT;
-	new_arming_state = ARMING_STATE_INIT;
-	mu_assert("no transition: identical states",
-		  TRANSITION_NOT_CHANGED == arming_state_transition(&status, &safety, new_arming_state, &armed));
-
-	// INIT to STANDBY.
-	armed.armed = false;
-	armed.ready_to_arm = false;
-	status.arming_state = ARMING_STATE_INIT;
-	status.condition_system_sensors_initialized = true;
-	new_arming_state = ARMING_STATE_STANDBY;
-	mu_assert("transition: init to standby",
-		  TRANSITION_CHANGED == arming_state_transition(&status, &safety, new_arming_state, &armed));
-	mu_assert("current state: standby", ARMING_STATE_STANDBY == status.arming_state);
-	mu_assert("not armed", !armed.armed);
-	mu_assert("ready to arm", armed.ready_to_arm);
-
-	// INIT to STANDBY, sensors not initialized.
-	armed.armed = false;
-	armed.ready_to_arm = false;
-	status.arming_state = ARMING_STATE_INIT;
-	status.condition_system_sensors_initialized = false;
-	new_arming_state = ARMING_STATE_STANDBY;
-	mu_assert("no transition: sensors not initialized",
-		  TRANSITION_DENIED == arming_state_transition(&status, &safety, new_arming_state, &armed));
-	mu_assert("current state: init", ARMING_STATE_INIT == status.arming_state);
-	mu_assert("not armed", !armed.armed);
-	mu_assert("not ready to arm", !armed.ready_to_arm);
-
-	return 0;
-}
-
-const char*
-StateMachineHelperTest::arming_state_transition_arm_disarm_test()
-{
-	struct vehicle_status_s status;
-	struct safety_s safety;
-	arming_state_t new_arming_state;
+	struct safety_s         safety;
 	struct actuator_armed_s armed;
-
-	// TODO(sjwilks): ARM then DISARM.
-	return 0;
+    
+    size_t cArmingTransitionTests = sizeof(rgArmingTransitionTests) / sizeof(rgArmingTransitionTests[0]);
+    for (size_t i=0; i<cArmingTransitionTests; i++) {
+        const ArmingTransitionTest_t* test = &rgArmingTransitionTests[i];
+        
+        // Setup initial machine state
+        status.arming_state = test->current_state.arming_state;
+        status.condition_system_sensors_initialized = test->condition_system_sensors_initialized;
+        status.hil_state = test->hil_state;
+        safety.safety_switch_available = test->safety_switch_available;
+        safety.safety_off = test->safety_off;
+        armed.armed = test->current_state.armed;
+        armed.ready_to_arm = test->current_state.ready_to_arm;
+        
+        // Attempt transition
+        transition_result_t result = arming_state_transition(&status, &safety, test->requested_state, &armed);
+        
+        // Validate result of transition
+        ut_assert(test->assertMsg, test->expected_transition_result == result);
+        ut_assert(test->assertMsg, status.arming_state == test->expected_state.arming_state);
+        ut_assert(test->assertMsg, armed.armed == test->expected_state.armed);
+        ut_assert(test->assertMsg, armed.ready_to_arm == test->expected_state.ready_to_arm);
+    }
+
+	return true;
 }
 
-const char*
-StateMachineHelperTest::main_state_transition_test()
+bool StateMachineHelperTest::mainStateTransitionTest(void)
 {
 	struct vehicle_status_s current_state;
 	main_state_t new_main_state;
@@ -126,70 +306,69 @@ StateMachineHelperTest::main_state_transition_test()
 	// Identical states.
 	current_state.main_state = MAIN_STATE_MANUAL;
 	new_main_state = MAIN_STATE_MANUAL;
-	mu_assert("no transition: identical states",
+	ut_assert("no transition: identical states",
 		  TRANSITION_NOT_CHANGED == main_state_transition(&current_state, new_main_state));
-	mu_assert("current state: manual", MAIN_STATE_MANUAL == current_state.main_state);	
+	ut_assert("current state: manual", MAIN_STATE_MANUAL == current_state.main_state);	
 
 	// AUTO to MANUAL.
 	current_state.main_state = MAIN_STATE_AUTO;
 	new_main_state = MAIN_STATE_MANUAL;
-	mu_assert("transition changed: auto to manual",
+	ut_assert("transition changed: auto to manual",
 		  TRANSITION_CHANGED == main_state_transition(&current_state, new_main_state));
-	mu_assert("new state: manual", MAIN_STATE_MANUAL == current_state.main_state);
+	ut_assert("new state: manual", MAIN_STATE_MANUAL == current_state.main_state);
 
-	// MANUAL to SEATBELT.
+	// MANUAL to ALTCTRL.
 	current_state.main_state = MAIN_STATE_MANUAL;
 	current_state.condition_local_altitude_valid = true;
-	new_main_state = MAIN_STATE_SEATBELT;
-	mu_assert("tranisition: manual to seatbelt", 
+	new_main_state = MAIN_STATE_ALTCTL;
+	ut_assert("tranisition: manual to altctrl",
 		  TRANSITION_CHANGED == main_state_transition(&current_state, new_main_state));
-	mu_assert("new state: seatbelt", MAIN_STATE_SEATBELT == current_state.main_state);
+	ut_assert("new state: altctrl", MAIN_STATE_ALTCTL == current_state.main_state);
 
-	// MANUAL to SEATBELT, invalid local altitude.
+	// MANUAL to ALTCTRL, invalid local altitude.
 	current_state.main_state = MAIN_STATE_MANUAL;
 	current_state.condition_local_altitude_valid = false;
-	new_main_state = MAIN_STATE_SEATBELT;
-	mu_assert("no transition: invalid local altitude",
+	new_main_state = MAIN_STATE_ALTCTL;
+	ut_assert("no transition: invalid local altitude",
 		  TRANSITION_DENIED == main_state_transition(&current_state, new_main_state));
-	mu_assert("current state: manual", MAIN_STATE_MANUAL == current_state.main_state);
+	ut_assert("current state: manual", MAIN_STATE_MANUAL == current_state.main_state);
 
-	// MANUAL to EASY.
+	// MANUAL to POSCTRL.
 	current_state.main_state = MAIN_STATE_MANUAL;
 	current_state.condition_local_position_valid = true;
-	new_main_state = MAIN_STATE_EASY;
-	mu_assert("transition: manual to easy",
+	new_main_state = MAIN_STATE_POSCTL;
+	ut_assert("transition: manual to posctrl",
 		  TRANSITION_CHANGED == main_state_transition(&current_state, new_main_state));
-	mu_assert("current state: easy", MAIN_STATE_EASY == current_state.main_state);
+	ut_assert("current state: posctrl", MAIN_STATE_POSCTL == current_state.main_state);
 
-	// MANUAL to EASY, invalid local position.
+	// MANUAL to POSCTRL, invalid local position.
 	current_state.main_state = MAIN_STATE_MANUAL;
 	current_state.condition_local_position_valid = false;
-	new_main_state = MAIN_STATE_EASY;
-	mu_assert("no transition: invalid position",
+	new_main_state = MAIN_STATE_POSCTL;
+	ut_assert("no transition: invalid position",
 		  TRANSITION_DENIED == main_state_transition(&current_state, new_main_state));
-	mu_assert("current state: manual", MAIN_STATE_MANUAL == current_state.main_state);
+	ut_assert("current state: manual", MAIN_STATE_MANUAL == current_state.main_state);
 
 	// MANUAL to AUTO.
 	current_state.main_state = MAIN_STATE_MANUAL;
 	current_state.condition_global_position_valid = true;
 	new_main_state = MAIN_STATE_AUTO;
-	mu_assert("transition: manual to auto",
+	ut_assert("transition: manual to auto",
 		  TRANSITION_CHANGED == main_state_transition(&current_state, new_main_state));
-	mu_assert("current state: auto", MAIN_STATE_AUTO == current_state.main_state);
+	ut_assert("current state: auto", MAIN_STATE_AUTO == current_state.main_state);
 
 	// MANUAL to AUTO, invalid global position.
 	current_state.main_state = MAIN_STATE_MANUAL;
 	current_state.condition_global_position_valid = false;
 	new_main_state = MAIN_STATE_AUTO;
-	mu_assert("no transition: invalid global position",
+	ut_assert("no transition: invalid global position",
 		  TRANSITION_DENIED == main_state_transition(&current_state, new_main_state));
-	mu_assert("current state: manual", MAIN_STATE_MANUAL == current_state.main_state);
+	ut_assert("current state: manual", MAIN_STATE_MANUAL == current_state.main_state);
 
-	return 0;
+	return true;
 }
 
-const char*
-StateMachineHelperTest::is_safe_test()
+bool StateMachineHelperTest::isSafeTest(void)
 {
 	struct vehicle_status_s current_state;
 	struct safety_s safety;
@@ -199,49 +378,45 @@ StateMachineHelperTest::is_safe_test()
 	armed.lockdown = false;
 	safety.safety_switch_available = true;
 	safety.safety_off = false;
-	mu_assert("is safe: not armed", is_safe(&current_state, &safety, &armed));
+	ut_assert("is safe: not armed", is_safe(&current_state, &safety, &armed));
 
 	armed.armed = false;
 	armed.lockdown = true;
 	safety.safety_switch_available = true;
 	safety.safety_off = true;
-	mu_assert("is safe: software lockdown", is_safe(&current_state, &safety, &armed));
+	ut_assert("is safe: software lockdown", is_safe(&current_state, &safety, &armed));
 
 	armed.armed = true;
 	armed.lockdown = false;
 	safety.safety_switch_available = true;
 	safety.safety_off = true;
-	mu_assert("not safe: safety off", !is_safe(&current_state, &safety, &armed));
+	ut_assert("not safe: safety off", !is_safe(&current_state, &safety, &armed));
 
 	armed.armed = true;
 	armed.lockdown = false;
 	safety.safety_switch_available = true;
 	safety.safety_off = false;
-	mu_assert("is safe: safety off", is_safe(&current_state, &safety, &armed));
+	ut_assert("is safe: safety off", is_safe(&current_state, &safety, &armed));
 
 	armed.armed = true;
 	armed.lockdown = false;
 	safety.safety_switch_available = false;
 	safety.safety_off = false;
-	mu_assert("not safe: no safety switch", !is_safe(&current_state, &safety, &armed));
+	ut_assert("not safe: no safety switch", !is_safe(&current_state, &safety, &armed));
 
-	return 0;
+	return true;
 }
 
-const char*
-StateMachineHelperTest::run_tests()
+void StateMachineHelperTest::runTests(void)
 {
-	mu_run_test(arming_state_transition_test);
-	mu_run_test(arming_state_transition_arm_disarm_test);
-	mu_run_test(main_state_transition_test);
-	mu_run_test(is_safe_test);
-
-	return 0;
+	ut_run_test(armingStateTransitionTest);
+	ut_run_test(mainStateTransitionTest);
+	ut_run_test(isSafeTest);
 }
 
-void
-state_machine_helper_test()
+void stateMachineHelperTest(void)
 {
 	StateMachineHelperTest* test = new StateMachineHelperTest();
-	test->UnitTest::print_results(test->run_tests());
+    test->runTests();
+	test->printResults();
 }
diff --git a/src/modules/commander/commander_tests/state_machine_helper_test.h b/src/modules/commander/commander_tests/state_machine_helper_test.h
index 10a68e602..bbf66255e 100644
--- a/src/modules/commander/commander_tests/state_machine_helper_test.h
+++ b/src/modules/commander/commander_tests/state_machine_helper_test.h
@@ -39,6 +39,6 @@
 #ifndef STATE_MACHINE_HELPER_TEST_H_
 #define STATE_MACHINE_HELPER_TEST_
 
-void state_machine_helper_test();
+void stateMachineHelperTest(void);
 
 #endif /* STATE_MACHINE_HELPER_TEST_H_ */
diff --git a/src/modules/commander/gyro_calibration.cpp b/src/modules/commander/gyro_calibration.cpp
index 30cd0d48d..cbc2844c1 100644
--- a/src/modules/commander/gyro_calibration.cpp
+++ b/src/modules/commander/gyro_calibration.cpp
@@ -110,8 +110,9 @@ int do_gyro_calibration(int mavlink_fd)
 				gyro_scale.z_offset += gyro_report.z;
 				calibration_counter++;
 
-				if (calibration_counter % (calibration_count / 20) == 0)
+				if (calibration_counter % (calibration_count / 20) == 0) {
 					mavlink_log_info(mavlink_fd, CAL_PROGRESS_MSG, sensor_name, (calibration_counter * 100) / calibration_count);
+				}
 
 			} else {
 				poll_errcount++;
@@ -163,8 +164,9 @@ int do_gyro_calibration(int mavlink_fd)
 	/* apply new offsets */
 	fd = open(GYRO_DEVICE_PATH, 0);
 
-	if (OK != ioctl(fd, GYROIOCSSCALE, (long unsigned int)&gyro_scale))
+	if (OK != ioctl(fd, GYROIOCSSCALE, (long unsigned int)&gyro_scale)) {
 		warn("WARNING: failed to apply new offsets for gyro");
+	}
 
 	close(fd);
 
@@ -178,9 +180,9 @@ int do_gyro_calibration(int mavlink_fd)
 
 	float mag_last = -atan2f(raw.magnetometer_ga[1], raw.magnetometer_ga[0]);
 
-	if (mag_last > M_PI_F) mag_last -= 2 * M_PI_F;
+	if (mag_last > M_PI_F) { mag_last -= 2 * M_PI_F; }
 
-	if (mag_last < -M_PI_F) mag_last += 2 * M_PI_F;
+	if (mag_last < -M_PI_F) { mag_last += 2 * M_PI_F; }
 
 
 	uint64_t last_time = hrt_absolute_time();
@@ -220,15 +222,15 @@ int do_gyro_calibration(int mavlink_fd)
 			//float mag = -atan2f(magNav(1),magNav(0));
 			float mag = -atan2f(raw.magnetometer_ga[1], raw.magnetometer_ga[0]);
 
-			if (mag > M_PI_F) mag -= 2 * M_PI_F;
+			if (mag > M_PI_F) { mag -= 2 * M_PI_F; }
 
-			if (mag < -M_PI_F) mag += 2 * M_PI_F;
+			if (mag < -M_PI_F) { mag += 2 * M_PI_F; }
 
 			float diff = mag - mag_last;
 
-			if (diff > M_PI_F) diff -= 2 * M_PI_F;
+			if (diff > M_PI_F) { diff -= 2 * M_PI_F; }
 
-			if (diff < -M_PI_F) diff += 2 * M_PI_F;
+			if (diff < -M_PI_F) { diff += 2 * M_PI_F; }
 
 			baseline_integral += diff;
 			mag_last = mag;
diff --git a/src/modules/commander/mag_calibration.cpp b/src/modules/commander/mag_calibration.cpp
index 4ebf266f4..0ead22f77 100644
--- a/src/modules/commander/mag_calibration.cpp
+++ b/src/modules/commander/mag_calibration.cpp
@@ -72,7 +72,7 @@ int do_mag_calibration(int mavlink_fd)
 	uint64_t calibration_interval = 45 * 1000 * 1000;
 
 	/* maximum 500 values */
-	const unsigned int calibration_maxcount = 500;
+	const unsigned int calibration_maxcount = 240;
 	unsigned int calibration_counter;
 
 	struct mag_scale mscale_null = {
@@ -121,9 +121,24 @@ int do_mag_calibration(int mavlink_fd)
 
 		if (x == NULL || y == NULL || z == NULL) {
 			mavlink_log_critical(mavlink_fd, "ERROR: out of memory");
+
+			/* clean up */
+			if (x != NULL) {
+				free(x);
+			}
+
+			if (y != NULL) {
+				free(y);
+			}
+
+			if (z != NULL) {
+				free(z);
+			}
+
 			res = ERROR;
 			return res;
 		}
+
 	} else {
 		/* exit */
 		return ERROR;
@@ -163,8 +178,9 @@ int do_mag_calibration(int mavlink_fd)
 
 				calibration_counter++;
 
-				if (calibration_counter % (calibration_maxcount / 20) == 0)
+				if (calibration_counter % (calibration_maxcount / 20) == 0) {
 					mavlink_log_info(mavlink_fd, CAL_PROGRESS_MSG, sensor_name, 20 + (calibration_counter * 50) / calibration_maxcount);
+				}
 
 			} else {
 				poll_errcount++;
@@ -198,14 +214,17 @@ int do_mag_calibration(int mavlink_fd)
 		}
 	}
 
-	if (x != NULL)
+	if (x != NULL) {
 		free(x);
+	}
 
-	if (y != NULL)
+	if (y != NULL) {
 		free(y);
+	}
 
-	if (z != NULL)
+	if (z != NULL) {
 		free(z);
+	}
 
 	if (res == OK) {
 		/* apply calibration and set parameters */
@@ -234,23 +253,29 @@ int do_mag_calibration(int mavlink_fd)
 
 		if (res == OK) {
 			/* set parameters */
-			if (param_set(param_find("SENS_MAG_XOFF"), &(mscale.x_offset)))
+			if (param_set(param_find("SENS_MAG_XOFF"), &(mscale.x_offset))) {
 				res = ERROR;
+			}
 
-			if (param_set(param_find("SENS_MAG_YOFF"), &(mscale.y_offset)))
+			if (param_set(param_find("SENS_MAG_YOFF"), &(mscale.y_offset))) {
 				res = ERROR;
+			}
 
-			if (param_set(param_find("SENS_MAG_ZOFF"), &(mscale.z_offset)))
+			if (param_set(param_find("SENS_MAG_ZOFF"), &(mscale.z_offset))) {
 				res = ERROR;
+			}
 
-			if (param_set(param_find("SENS_MAG_XSCALE"), &(mscale.x_scale)))
+			if (param_set(param_find("SENS_MAG_XSCALE"), &(mscale.x_scale))) {
 				res = ERROR;
+			}
 
-			if (param_set(param_find("SENS_MAG_YSCALE"), &(mscale.y_scale)))
+			if (param_set(param_find("SENS_MAG_YSCALE"), &(mscale.y_scale))) {
 				res = ERROR;
+			}
 
-			if (param_set(param_find("SENS_MAG_ZSCALE"), &(mscale.z_scale)))
+			if (param_set(param_find("SENS_MAG_ZSCALE"), &(mscale.z_scale))) {
 				res = ERROR;
+			}
 
 			if (res != OK) {
 				mavlink_log_critical(mavlink_fd, CAL_FAILED_SET_PARAMS_MSG);
diff --git a/src/modules/commander/module.mk b/src/modules/commander/module.mk
index 554dfcb08..27ca5c182 100644
--- a/src/modules/commander/module.mk
+++ b/src/modules/commander/module.mk
@@ -47,3 +47,7 @@ SRCS		 	= commander.cpp \
 			baro_calibration.cpp \
 			rc_calibration.cpp \
 			airspeed_calibration.cpp
+
+MODULE_STACKSIZE = 1200
+
+MAXOPTIMIZATION	 = -Os
diff --git a/src/modules/commander/px4_custom_mode.h b/src/modules/commander/px4_custom_mode.h
index 2144d3460..7f5f93801 100644
--- a/src/modules/commander/px4_custom_mode.h
+++ b/src/modules/commander/px4_custom_mode.h
@@ -12,9 +12,10 @@
 
 enum PX4_CUSTOM_MAIN_MODE {
 	PX4_CUSTOM_MAIN_MODE_MANUAL = 1,
-	PX4_CUSTOM_MAIN_MODE_SEATBELT,
-	PX4_CUSTOM_MAIN_MODE_EASY,
+	PX4_CUSTOM_MAIN_MODE_ALTCTL,
+	PX4_CUSTOM_MAIN_MODE_POSCTL,
 	PX4_CUSTOM_MAIN_MODE_AUTO,
+	PX4_CUSTOM_MAIN_MODE_ACRO,
 };
 
 enum PX4_CUSTOM_SUB_MODE_AUTO {
@@ -24,6 +25,7 @@ enum PX4_CUSTOM_SUB_MODE_AUTO {
 	PX4_CUSTOM_SUB_MODE_AUTO_MISSION,
 	PX4_CUSTOM_SUB_MODE_AUTO_RTL,
 	PX4_CUSTOM_SUB_MODE_AUTO_LAND,
+	PX4_CUSTOM_SUB_MODE_AUTO_RTGS
 };
 
 union px4_custom_mode {
diff --git a/src/modules/commander/rc_calibration.cpp b/src/modules/commander/rc_calibration.cpp
index 41f3ca0aa..0776894fb 100644
--- a/src/modules/commander/rc_calibration.cpp
+++ b/src/modules/commander/rc_calibration.cpp
@@ -69,11 +69,11 @@ int do_trim_calibration(int mavlink_fd)
 	orb_copy(ORB_ID(manual_control_setpoint), sub_man, &sp);
 
 	/* set parameters */
-	float p = sp.roll;
+	float p = sp.y;
 	param_set(param_find("TRIM_ROLL"), &p);
-	p = sp.pitch;
+	p = sp.x;
 	param_set(param_find("TRIM_PITCH"), &p);
-	p = sp.yaw;
+	p = sp.r;
 	param_set(param_find("TRIM_YAW"), &p);
 
 	/* store to permanent storage */
diff --git a/src/modules/commander/state_machine_helper.cpp b/src/modules/commander/state_machine_helper.cpp
index e6f245cf9..244513375 100644
--- a/src/modules/commander/state_machine_helper.cpp
+++ b/src/modules/commander/state_machine_helper.cpp
@@ -1,8 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2013 PX4 Development Team. All rights reserved.
- *   Author: Thomas Gubler <thomasgubler@student.ethz.ch>
- *           Julian Oes <joes@student.ethz.ch>
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -36,6 +34,9 @@
 /**
  * @file state_machine_helper.cpp
  * State machine helper functions implementations
+ *
+ * @author Thomas Gubler <thomasgubler@student.ethz.ch>
+ * @author Julian Oes <julian@oes.ch>
  */
 
 #include <stdio.h>
@@ -45,14 +46,18 @@
 #include <dirent.h>
 #include <fcntl.h>
 #include <string.h>
+#include <math.h>
 
 #include <uORB/uORB.h>
 #include <uORB/topics/vehicle_status.h>
 #include <uORB/topics/actuator_controls.h>
+#include <uORB/topics/differential_pressure.h>
 #include <systemlib/systemlib.h>
 #include <systemlib/param/param.h>
 #include <systemlib/err.h>
 #include <drivers/drv_hrt.h>
+#include <drivers/drv_accel.h>
+#include <drivers/drv_airspeed.h>
 #include <drivers/drv_device.h>
 #include <mavlink/mavlink_log.h>
 
@@ -65,27 +70,71 @@
 #endif
 static const int ERROR = -1;
 
-static bool arming_state_changed = true;
-static bool main_state_changed = true;
-static bool failsafe_state_changed = true;
+static int prearm_check(const struct vehicle_status_s *status, const int mavlink_fd);
+
+// This array defines the arming state transitions. The rows are the new state, and the columns
+// are the current state. Using new state and current  state you can index into the array which
+// will be true for a valid transition or false for a invalid transition. In some cases even
+// though the transition is marked as true additional checks must be made. See arming_state_transition
+// code for those checks.
+static const bool arming_transitions[ARMING_STATE_MAX][ARMING_STATE_MAX] = {
+	//                                  INIT,  STANDBY, ARMED, ARMED_ERROR, STANDBY_ERROR, REBOOT, IN_AIR_RESTORE
+	{ /* ARMING_STATE_INIT */           true,  true,    false, false,       false,         false,  false },
+	{ /* ARMING_STATE_STANDBY */        true,  true,    true,  true,        false,         false,  false },
+	{ /* ARMING_STATE_ARMED */          false, true,    true,  false,       false,         false,  true },
+	{ /* ARMING_STATE_ARMED_ERROR */    false, false,   true,  true,        false,         false,  false },
+	{ /* ARMING_STATE_STANDBY_ERROR */  true,  true,    false, true,        true,          false,  false },
+	{ /* ARMING_STATE_REBOOT */         true,  true,    false, false,       true,          true,   true },
+	{ /* ARMING_STATE_IN_AIR_RESTORE */ false, false,   false, false,       false,         false,  false }, // NYI
+};
+
+// You can index into the array with an arming_state_t in order to get it's textual representation
+static const char *state_names[ARMING_STATE_MAX] = {
+	"ARMING_STATE_INIT",
+	"ARMING_STATE_STANDBY",
+	"ARMING_STATE_ARMED",
+	"ARMING_STATE_ARMED_ERROR",
+	"ARMING_STATE_STANDBY_ERROR",
+	"ARMING_STATE_REBOOT",
+	"ARMING_STATE_IN_AIR_RESTORE",
+};
 
 transition_result_t
-arming_state_transition(struct vehicle_status_s *status, const struct safety_s *safety,
-			arming_state_t new_arming_state, struct actuator_armed_s *armed)
+arming_state_transition(struct vehicle_status_s *status,            /// current vehicle status
+			const struct safety_s   *safety,            /// current safety settings
+			arming_state_t          new_arming_state,   /// arming state requested
+			struct actuator_armed_s *armed,             /// current armed status
+			const int               mavlink_fd)         /// mavlink fd for error reporting, 0 for none
 {
-	/*
-	 * Perform an atomic state update
-	 */
-	irqstate_t flags = irqsave();
+	// Double check that our static arrays are still valid
+	ASSERT(ARMING_STATE_INIT == 0);
+	ASSERT(ARMING_STATE_IN_AIR_RESTORE == ARMING_STATE_MAX - 1);
 
 	transition_result_t ret = TRANSITION_DENIED;
 
+	arming_state_t current_arming_state = status->arming_state;
+
 	/* only check transition if the new state is actually different from the current one */
-	if (new_arming_state == status->arming_state) {
+	if (new_arming_state == current_arming_state) {
 		ret = TRANSITION_NOT_CHANGED;
 
 	} else {
 
+		/*
+		 * Get sensing state if necessary
+		 */
+		int prearm_ret = OK;
+
+		/* only perform the check if we have to */
+		if (new_arming_state == ARMING_STATE_ARMED) {
+			prearm_ret = prearm_check(status, mavlink_fd);
+		}
+
+		/*
+		 * Perform an atomic state update
+		 */
+		irqstate_t flags = irqsave();
+
 		/* enforce lockdown in HIL */
 		if (status->hil_state == HIL_STATE_ON) {
 			armed->lockdown = true;
@@ -94,105 +143,86 @@ arming_state_transition(struct vehicle_status_s *status, const struct safety_s *
 			armed->lockdown = false;
 		}
 
-		switch (new_arming_state) {
-		case ARMING_STATE_INIT:
-
-			/* allow going back from INIT for calibration */
-			if (status->arming_state == ARMING_STATE_STANDBY) {
-				ret = TRANSITION_CHANGED;
-				armed->armed = false;
-				armed->ready_to_arm = false;
-			}
-
-			break;
-
-		case ARMING_STATE_STANDBY:
-
-			/* allow coming from INIT and disarming from ARMED */
-			if (status->arming_state == ARMING_STATE_INIT
-			    || status->arming_state == ARMING_STATE_ARMED
-			    || status->hil_state == HIL_STATE_ON) {
+		// Check that we have a valid state transition
+		bool valid_transition = arming_transitions[new_arming_state][status->arming_state];
 
-				/* sensors need to be initialized for STANDBY state */
-				if (status->condition_system_sensors_initialized) {
-					ret = TRANSITION_CHANGED;
-					armed->armed = false;
-					armed->ready_to_arm = true;
-				}
-			}
+		if (valid_transition) {
+			// We have a good transition. Now perform any secondary validation.
+			if (new_arming_state == ARMING_STATE_ARMED) {
 
-			break;
-
-		case ARMING_STATE_ARMED:
+				//      Do not perform pre-arm checks if coming from in air restore
+				//      Allow if HIL_STATE_ON
+				if (status->arming_state != ARMING_STATE_IN_AIR_RESTORE &&
+					status->hil_state == HIL_STATE_OFF) {
 
-			/* allow arming from STANDBY and IN-AIR-RESTORE */
-			if ((status->arming_state == ARMING_STATE_STANDBY
-			     || status->arming_state == ARMING_STATE_IN_AIR_RESTORE)
-			    && (!safety->safety_switch_available || safety->safety_off || status->hil_state == HIL_STATE_ON)) { /* only allow arming if safety is off */
-				ret = TRANSITION_CHANGED;
-				armed->armed = true;
-				armed->ready_to_arm = true;
-			}
+					// Fail transition if pre-arm check fails
+					if (prearm_ret) {
+						valid_transition = false;
 
-			break;
+					// Fail transition if we need safety switch press
+					} else if (safety->safety_switch_available && !safety->safety_off) {
 
-		case ARMING_STATE_ARMED_ERROR:
+						mavlink_log_critical(mavlink_fd, "#audio: NOT ARMING: Press safety switch!");
 
-			/* an armed error happens when ARMED obviously */
-			if (status->arming_state == ARMING_STATE_ARMED) {
-				ret = TRANSITION_CHANGED;
-				armed->armed = true;
-				armed->ready_to_arm = false;
-			}
+						valid_transition = false;
+					}
 
-			break;
+					// Perform power checks only if circuit breaker is not
+					// engaged for these checks
+					if (!status->circuit_breaker_engaged_power_check) {
+						// Fail transition if power is not good
+						if (!status->condition_power_input_valid) {
 
-		case ARMING_STATE_STANDBY_ERROR:
+							mavlink_log_critical(mavlink_fd, "#audio: NOT ARMING: Connect power module.");
+							valid_transition = false;
+						}
 
-			/* a disarmed error happens when in STANDBY or in INIT or after ARMED_ERROR */
-			if (status->arming_state == ARMING_STATE_STANDBY
-			    || status->arming_state == ARMING_STATE_INIT
-			    || status->arming_state == ARMING_STATE_ARMED_ERROR) {
-				ret = TRANSITION_CHANGED;
-				armed->armed = false;
-				armed->ready_to_arm = false;
-			}
+						// Fail transition if power levels on the avionics rail
+						// are measured but are insufficient
+						if (status->condition_power_input_valid && (status->avionics_power_rail_voltage > 0.0f) &&
+							(status->avionics_power_rail_voltage < 4.9f)) {
 
-			break;
+							mavlink_log_critical(mavlink_fd, "#audio: NOT ARMING: Avionics power low: %6.2f V.", status->avionics_power_rail_voltage);
+							valid_transition = false;
+						}
+					}
 
-		case ARMING_STATE_REBOOT:
+				}
 
-			/* an armed error happens when ARMED obviously */
-			if (status->arming_state == ARMING_STATE_INIT
-			    || status->arming_state == ARMING_STATE_STANDBY
-			    || status->arming_state == ARMING_STATE_STANDBY_ERROR) {
-				ret = TRANSITION_CHANGED;
-				armed->armed = false;
-				armed->ready_to_arm = false;
+			} else if (new_arming_state == ARMING_STATE_STANDBY && status->arming_state == ARMING_STATE_ARMED_ERROR) {
+				new_arming_state = ARMING_STATE_STANDBY_ERROR;
 			}
+		}
 
-			break;
-
-		case ARMING_STATE_IN_AIR_RESTORE:
-
-			/* XXX implement */
-			break;
+		// HIL can always go to standby
+		if (status->hil_state == HIL_STATE_ON && new_arming_state == ARMING_STATE_STANDBY) {
+			valid_transition = true;
+		}
 
-		default:
-			break;
+		/* Sensors need to be initialized for STANDBY state */
+		if (new_arming_state == ARMING_STATE_STANDBY && !status->condition_system_sensors_initialized) {
+			valid_transition = false;
 		}
 
-		if (ret == TRANSITION_CHANGED) {
+		// Finish up the state transition
+		if (valid_transition) {
+			armed->armed = new_arming_state == ARMING_STATE_ARMED || new_arming_state == ARMING_STATE_ARMED_ERROR;
+			armed->ready_to_arm = new_arming_state == ARMING_STATE_ARMED || new_arming_state == ARMING_STATE_STANDBY;
+			ret = TRANSITION_CHANGED;
 			status->arming_state = new_arming_state;
-			arming_state_changed = true;
 		}
+
+		/* end of atomic state update */
+		irqrestore(flags);
 	}
 
-	/* end of atomic state update */
-	irqrestore(flags);
+	if (ret == TRANSITION_DENIED) {
+		static const char *errMsg = "INVAL: %s - %s";
 
-	if (ret == TRANSITION_DENIED)
-		warnx("arming transition rejected");
+		mavlink_log_critical(mavlink_fd, errMsg, state_names[status->arming_state], state_names[new_arming_state]);
+
+		warnx(errMsg, state_names[status->arming_state], state_names[new_arming_state]);
+	}
 
 	return ret;
 }
@@ -211,65 +241,58 @@ bool is_safe(const struct vehicle_status_s *status, const struct safety_s *safet
 	}
 }
 
-bool
-check_arming_state_changed()
-{
-	if (arming_state_changed) {
-		arming_state_changed = false;
-		return true;
-
-	} else {
-		return false;
-	}
-}
-
 transition_result_t
 main_state_transition(struct vehicle_status_s *status, main_state_t new_main_state)
 {
 	transition_result_t ret = TRANSITION_DENIED;
 
-	/* transition may be denied even if requested the same state because conditions may be changed */
+	/* transition may be denied even if the same state is requested because conditions may have changed */
 	switch (new_main_state) {
 	case MAIN_STATE_MANUAL:
+	case MAIN_STATE_ACRO:
 		ret = TRANSITION_CHANGED;
 		break;
 
-	case MAIN_STATE_SEATBELT:
-
+	case MAIN_STATE_ALTCTL:
 		/* need at minimum altitude estimate */
+		/* TODO: add this for fixedwing as well */
 		if (!status->is_rotary_wing ||
 		    (status->condition_local_altitude_valid ||
 		     status->condition_global_position_valid)) {
 			ret = TRANSITION_CHANGED;
 		}
-
 		break;
 
-	case MAIN_STATE_EASY:
-
+	case MAIN_STATE_POSCTL:
 		/* need at minimum local position estimate */
 		if (status->condition_local_position_valid ||
 		    status->condition_global_position_valid) {
 			ret = TRANSITION_CHANGED;
 		}
-
 		break;
 
-	case MAIN_STATE_AUTO:
-
+	case MAIN_STATE_AUTO_MISSION:
+	case MAIN_STATE_AUTO_LOITER:
 		/* need global position estimate */
 		if (status->condition_global_position_valid) {
 			ret = TRANSITION_CHANGED;
 		}
+		break;
 
+	case MAIN_STATE_AUTO_RTL:
+		/* need global position and home position */
+		if (status->condition_global_position_valid && status->condition_home_position_valid) {
+			ret = TRANSITION_CHANGED;
+		}
 		break;
-	}
 
+	case MAIN_STATE_MAX:
+	default:
+		break;
+	}
 	if (ret == TRANSITION_CHANGED) {
 		if (status->main_state != new_main_state) {
 			status->main_state = new_main_state;
-			main_state_changed = true;
-
 		} else {
 			ret = TRANSITION_NOT_CHANGED;
 		}
@@ -278,69 +301,35 @@ main_state_transition(struct vehicle_status_s *status, main_state_t new_main_sta
 	return ret;
 }
 
-bool
-check_main_state_changed()
-{
-	if (main_state_changed) {
-		main_state_changed = false;
-		return true;
-
-	} else {
-		return false;
-	}
-}
-
-bool
-check_failsafe_state_changed()
-{
-	if (failsafe_state_changed) {
-		failsafe_state_changed = false;
-		return true;
-
-	} else {
-		return false;
-	}
-}
-
 /**
-* Transition from one hil state to another
-*/
-int hil_state_transition(hil_state_t new_state, int status_pub, struct vehicle_status_s *current_status, const int mavlink_fd)
+ * Transition from one hil state to another
+ */
+transition_result_t hil_state_transition(hil_state_t new_state, int status_pub, struct vehicle_status_s *current_status, const int mavlink_fd)
 {
-	bool valid_transition = false;
-	int ret = ERROR;
+	transition_result_t ret = TRANSITION_DENIED;
 
 	if (current_status->hil_state == new_state) {
-		valid_transition = true;
+		ret = TRANSITION_NOT_CHANGED;
 
 	} else {
-
 		switch (new_state) {
-
 		case HIL_STATE_OFF:
-
 			/* we're in HIL and unexpected things can happen if we disable HIL now */
-			mavlink_log_critical(mavlink_fd, "Not switching off HIL (safety)");
-			valid_transition = false;
-
+			mavlink_log_critical(mavlink_fd, "#audio: Not switching off HIL (safety)");
+			ret = TRANSITION_DENIED;
 			break;
 
 		case HIL_STATE_ON:
-
 			if (current_status->arming_state == ARMING_STATE_INIT
 			    || current_status->arming_state == ARMING_STATE_STANDBY
 			    || current_status->arming_state == ARMING_STATE_STANDBY_ERROR) {
 
-				mavlink_log_critical(mavlink_fd, "Switched to ON hil state");
-				valid_transition = true;
-
-				// Disable publication of all attached sensors
-
+				/* Disable publication of all attached sensors */
 				/* list directory */
 				DIR		*d;
 				d = opendir("/dev");
-				if (d) {
 
+				if (d) {
 					struct dirent	*direntry;
 					char devname[24];
 
@@ -350,26 +339,32 @@ int hil_state_transition(hil_state_t new_state, int status_pub, struct vehicle_s
 						if (!strncmp("tty", direntry->d_name, 3)) {
 							continue;
 						}
+
 						/* skip mtd devices */
 						if (!strncmp("mtd", direntry->d_name, 3)) {
 							continue;
 						}
+
 						/* skip ram devices */
 						if (!strncmp("ram", direntry->d_name, 3)) {
 							continue;
 						}
+
 						/* skip MMC devices */
 						if (!strncmp("mmc", direntry->d_name, 3)) {
 							continue;
 						}
+
 						/* skip mavlink */
 						if (!strcmp("mavlink", direntry->d_name)) {
 							continue;
 						}
+
 						/* skip console */
 						if (!strcmp("console", direntry->d_name)) {
 							continue;
 						}
+
 						/* skip null */
 						if (!strcmp("null", direntry->d_name)) {
 							continue;
@@ -389,290 +384,287 @@ int hil_state_transition(hil_state_t new_state, int status_pub, struct vehicle_s
 
 						printf("Disabling %s: %s\n", devname, (block_ret == OK) ? "OK" : "ERROR");
 					}
-
 					closedir(d);
+					ret = TRANSITION_CHANGED;
+					mavlink_log_critical(mavlink_fd, "Switched to ON hil state");
+
 
 				} else {
 					/* failed opening dir */
-					warnx("FAILED LISTING DEVICE ROOT DIRECTORY");
-					return 1;
+					mavlink_log_info(mavlink_fd, "FAILED LISTING DEVICE ROOT DIRECTORY");
+					ret = TRANSITION_DENIED;
 				}
+			} else {
+				mavlink_log_critical(mavlink_fd, "Not switching to HIL when armed");
+				ret = TRANSITION_DENIED;
 			}
-
 			break;
 
 		default:
-			warnx("Unknown hil state");
+			warnx("Unknown HIL state");
 			break;
 		}
 	}
 
-	if (valid_transition) {
+	if (ret == TRANSITION_CHANGED) {
 		current_status->hil_state = new_state;
-
 		current_status->timestamp = hrt_absolute_time();
-		orb_publish(ORB_ID(vehicle_status), status_pub, current_status);
-
 		// XXX also set lockdown here
-
-		ret = OK;
-
-	} else {
-		mavlink_log_critical(mavlink_fd, "REJECTING invalid hil state transition");
+		orb_publish(ORB_ID(vehicle_status), status_pub, current_status);
 	}
-
 	return ret;
 }
 
-
 /**
-* Transition from one failsafe state to another
-*/
-transition_result_t failsafe_state_transition(struct vehicle_status_s *status, failsafe_state_t new_failsafe_state)
+ * Check failsafe and main status and set navigation status for navigator accordingly
+ */
+bool set_nav_state(struct vehicle_status_s *status, const bool data_link_loss_enabled, const bool mission_finished)
 {
-	transition_result_t ret = TRANSITION_DENIED;
+	navigation_state_t nav_state_old = status->nav_state;
 
-	/* transition may be denied even if requested the same state because conditions may be changed */
-	if (status->failsafe_state == FAILSAFE_STATE_TERMINATION) {
-		/* transitions from TERMINATION to other states not allowed */
-		if (new_failsafe_state == FAILSAFE_STATE_TERMINATION) {
-			ret = TRANSITION_NOT_CHANGED;
+	bool armed = (status->arming_state == ARMING_STATE_ARMED || status->arming_state == ARMING_STATE_ARMED_ERROR);
+	status->failsafe = false;
+
+	/* evaluate main state to decide in normal (non-failsafe) mode */
+	switch (status->main_state) {
+	case MAIN_STATE_ACRO:
+	case MAIN_STATE_MANUAL:
+	case MAIN_STATE_ALTCTL:
+	case MAIN_STATE_POSCTL:
+		/* require RC for all manual modes */
+		if (status->rc_signal_lost && armed) {
+			status->failsafe = true;
+
+			if (status->condition_global_position_valid && status->condition_home_position_valid) {
+				status->nav_state = NAVIGATION_STATE_AUTO_RTL;
+			} else if (status->condition_local_position_valid) {
+				status->nav_state = NAVIGATION_STATE_LAND;
+			} else if (status->condition_local_altitude_valid) {
+				status->nav_state = NAVIGATION_STATE_DESCEND;
+			} else {
+				status->nav_state = NAVIGATION_STATE_TERMINATION;
+			}
+
+		} else {
+			switch (status->main_state) {
+			case MAIN_STATE_ACRO:
+				status->nav_state = NAVIGATION_STATE_ACRO;
+				break;
+
+			case MAIN_STATE_MANUAL:
+				status->nav_state = NAVIGATION_STATE_MANUAL;
+				break;
+
+			case MAIN_STATE_ALTCTL:
+				status->nav_state = NAVIGATION_STATE_ALTCTL;
+				break;
+
+			case MAIN_STATE_POSCTL:
+				status->nav_state = NAVIGATION_STATE_POSCTL;
+				break;
+
+			default:
+				status->nav_state = NAVIGATION_STATE_MANUAL;
+				break;
+			}
 		}
+		break;
 
-	} else {
-		switch (new_failsafe_state) {
-		case FAILSAFE_STATE_NORMAL:
-			/* always allowed (except from TERMINATION state) */
-			ret = TRANSITION_CHANGED;
-			break;
+	case MAIN_STATE_AUTO_MISSION:
+		/* go into failsafe
+		 * - if either the datalink is enabled and lost as well as RC is lost
+		 * - if there is no datalink and the mission is finished */
+		if (((status->data_link_lost && data_link_loss_enabled) && status->rc_signal_lost) ||
+		    (!data_link_loss_enabled && status->rc_signal_lost && mission_finished)) {
+			status->failsafe = true;
 
-		case FAILSAFE_STATE_RTL:
+			if (status->condition_global_position_valid && status->condition_home_position_valid) {
+				status->nav_state = NAVIGATION_STATE_AUTO_RTL;
+			} else if (status->condition_local_position_valid) {
+				status->nav_state = NAVIGATION_STATE_LAND;
+			} else if (status->condition_local_altitude_valid) {
+				status->nav_state = NAVIGATION_STATE_DESCEND;
+			} else {
+				status->nav_state = NAVIGATION_STATE_TERMINATION;
+			}
+
+		/* also go into failsafe if just datalink is lost */
+		} else if (status->data_link_lost && data_link_loss_enabled) {
+			status->failsafe = true;
 
-			/* global position and home position required for RTL */
 			if (status->condition_global_position_valid && status->condition_home_position_valid) {
-				status->set_nav_state = NAV_STATE_RTL;
-				status->set_nav_state_timestamp = hrt_absolute_time();
-				ret = TRANSITION_CHANGED;
+				status->nav_state = NAVIGATION_STATE_AUTO_RTGS;
+			} else if (status->condition_local_position_valid) {
+				status->nav_state = NAVIGATION_STATE_LAND;
+			} else if (status->condition_local_altitude_valid) {
+				status->nav_state = NAVIGATION_STATE_DESCEND;
+			} else {
+				status->nav_state = NAVIGATION_STATE_TERMINATION;
 			}
 
-			break;
+		/* don't bother if RC is lost and mission is not yet finished */
+		} else if (status->rc_signal_lost) {
 
-		case FAILSAFE_STATE_LAND:
+			/* this mode is ok, we don't need RC for missions */
+			status->nav_state = NAVIGATION_STATE_AUTO_MISSION;
+		} else {
+			/* everything is perfect */
+			status->nav_state = NAVIGATION_STATE_AUTO_MISSION;
+		}
+		break;
+
+	case MAIN_STATE_AUTO_LOITER:
+		/* go into failsafe if datalink and RC is lost */
+		if ((status->data_link_lost && data_link_loss_enabled) && status->rc_signal_lost) {
+			status->failsafe = true;
 
-			/* at least relative altitude estimate required for landing */
-			if (status->condition_local_altitude_valid || status->condition_global_position_valid) {
-				status->set_nav_state = NAV_STATE_LAND;
-				status->set_nav_state_timestamp = hrt_absolute_time();
-				ret = TRANSITION_CHANGED;
+			if (status->condition_global_position_valid && status->condition_home_position_valid) {
+				status->nav_state = NAVIGATION_STATE_AUTO_RTL;
+			} else if (status->condition_local_position_valid) {
+				status->nav_state = NAVIGATION_STATE_LAND;
+			} else if (status->condition_local_altitude_valid) {
+				status->nav_state = NAVIGATION_STATE_DESCEND;
+			} else {
+				status->nav_state = NAVIGATION_STATE_TERMINATION;
 			}
 
-			break;
+		/* also go into failsafe if just datalink is lost */
+		} else if (status->data_link_lost && data_link_loss_enabled) {
+			status->failsafe = true;
 
-		case FAILSAFE_STATE_TERMINATION:
-			/* always allowed */
-			ret = TRANSITION_CHANGED;
-			break;
+			if (status->condition_global_position_valid && status->condition_home_position_valid) {
+				status->nav_state = NAVIGATION_STATE_AUTO_RTGS;
+			} else if (status->condition_local_position_valid) {
+				status->nav_state = NAVIGATION_STATE_LAND;
+			} else if (status->condition_local_altitude_valid) {
+				status->nav_state = NAVIGATION_STATE_DESCEND;
+			} else {
+				status->nav_state = NAVIGATION_STATE_TERMINATION;
+			}
 
-		default:
-			break;
+		/* go into failsafe if RC is lost and datalink loss is not set up */
+		} else if (status->rc_signal_lost && !data_link_loss_enabled) {
+			status->failsafe = true;
+
+			if (status->condition_global_position_valid && status->condition_home_position_valid) {
+				status->nav_state = NAVIGATION_STATE_AUTO_RTGS;
+			} else if (status->condition_local_position_valid) {
+				status->nav_state = NAVIGATION_STATE_LAND;
+			} else if (status->condition_local_altitude_valid) {
+				status->nav_state = NAVIGATION_STATE_DESCEND;
+			} else {
+				status->nav_state = NAVIGATION_STATE_TERMINATION;
+			}
+
+		/* don't bother if RC is lost if datalink is connected */
+		} else if (status->rc_signal_lost) {
+
+			/* this mode is ok, we don't need RC for loitering */
+			status->nav_state = NAVIGATION_STATE_AUTO_LOITER;
+		} else {
+			/* everything is perfect */
+			status->nav_state = NAVIGATION_STATE_AUTO_LOITER;
 		}
+		break;
 
-		if (ret == TRANSITION_CHANGED) {
-			if (status->failsafe_state != new_failsafe_state) {
-				status->failsafe_state = new_failsafe_state;
-				failsafe_state_changed = true;
+	case MAIN_STATE_AUTO_RTL:
+		/* require global position and home */
+		if ((!status->condition_global_position_valid || !status->condition_home_position_valid)) {
+			status->failsafe = true;
 
+			if (status->condition_local_position_valid) {
+				status->nav_state = NAVIGATION_STATE_LAND;
+			} else if (status->condition_local_altitude_valid) {
+				status->nav_state = NAVIGATION_STATE_DESCEND;
 			} else {
-				ret = TRANSITION_NOT_CHANGED;
+				status->nav_state = NAVIGATION_STATE_TERMINATION;
 			}
+		} else {
+			status->nav_state = NAVIGATION_STATE_AUTO_RTL;
 		}
+		break;
+
+	default:
+		break;
 	}
 
-	return ret;
+	return status->nav_state != nav_state_old;
 }
 
+int prearm_check(const struct vehicle_status_s *status, const int mavlink_fd)
+{
+	int ret;
+
+	int fd = open(ACCEL_DEVICE_PATH, O_RDONLY);
+
+	if (fd < 0) {
+		mavlink_log_critical(mavlink_fd, "#audio: FAIL: ACCEL SENSOR MISSING");
+		ret = fd;
+		goto system_eval;
+	}
+
+	ret = ioctl(fd, ACCELIOCSELFTEST, 0);
+
+	if (ret != OK) {
+		mavlink_log_critical(mavlink_fd, "#audio: FAIL: ACCEL CALIBRATION");
+		goto system_eval;
+	}
+
+	/* check measurement result range */
+	struct accel_report acc;
+	ret = read(fd, &acc, sizeof(acc));
+
+	if (ret == sizeof(acc)) {
+		/* evaluate values */
+		float accel_scale = sqrtf(acc.x * acc.x + acc.y * acc.y + acc.z * acc.z);
 
+		if (accel_scale < 9.78f || accel_scale > 9.83f) {
+			mavlink_log_info(mavlink_fd, "#audio: Accelerometer calibration recommended.");
+		}
+
+		if (accel_scale > 30.0f /* m/s^2 */) {
+			mavlink_log_critical(mavlink_fd, "#audio: FAIL: ACCEL RANGE");
+			/* this is frickin' fatal */
+			ret = ERROR;
+			goto system_eval;
+		} else {
+			ret = OK;
+		}
+	} else {
+		mavlink_log_critical(mavlink_fd, "#audio: FAIL: ACCEL READ");
+		/* this is frickin' fatal */
+		ret = ERROR;
+		goto system_eval;
+	}
 
-// /*
-//  * Wrapper functions (to be used in the commander), all functions assume lock on current_status
-//  */
-
-// /* These functions decide if an emergency exits and then switch to SYSTEM_STATE_MISSION_ABORT or SYSTEM_STATE_GROUND_ERROR
-//  *
-//  * START SUBSYSTEM/EMERGENCY FUNCTIONS
-//  * */
-
-// void update_state_machine_subsystem_present(int status_pub, struct vehicle_status_s *current_status, subsystem_type_t *subsystem_type)
-// {
-// 	current_status->onboard_control_sensors_present |= 1 << *subsystem_type;
-// 	current_status->counter++;
-// 	current_status->timestamp = hrt_absolute_time();
-// 	orb_publish(ORB_ID(vehicle_status), status_pub, current_status);
-// }
-
-// void update_state_machine_subsystem_notpresent(int status_pub, struct vehicle_status_s *current_status, subsystem_type_t *subsystem_type)
-// {
-// 	current_status->onboard_control_sensors_present &= ~(1 << *subsystem_type);
-// 	current_status->counter++;
-// 	current_status->timestamp = hrt_absolute_time();
-// 	orb_publish(ORB_ID(vehicle_status), status_pub, current_status);
-
-// 	/* if a subsystem was removed something went completely wrong */
-
-// 	switch (*subsystem_type) {
-// 	case SUBSYSTEM_TYPE_GYRO:
-// 		//global_data_send_mavlink_statustext_message_out("Commander: gyro not present", MAV_SEVERITY_EMERGENCY);
-// 		state_machine_emergency_always_critical(status_pub, current_status);
-// 		break;
-
-// 	case SUBSYSTEM_TYPE_ACC:
-// 		//global_data_send_mavlink_statustext_message_out("Commander: accelerometer not present", MAV_SEVERITY_EMERGENCY);
-// 		state_machine_emergency_always_critical(status_pub, current_status);
-// 		break;
-
-// 	case SUBSYSTEM_TYPE_MAG:
-// 		//global_data_send_mavlink_statustext_message_out("Commander: magnetometer not present", MAV_SEVERITY_EMERGENCY);
-// 		state_machine_emergency_always_critical(status_pub, current_status);
-// 		break;
-
-// 	case SUBSYSTEM_TYPE_GPS:
-// 		{
-// 			uint8_t flight_env = global_data_parameter_storage->pm.param_values[PARAM_FLIGHT_ENV];
-
-// 			if (flight_env == PX4_FLIGHT_ENVIRONMENT_OUTDOOR) {
-// 				//global_data_send_mavlink_statustext_message_out("Commander: GPS not present", MAV_SEVERITY_EMERGENCY);
-// 				state_machine_emergency(status_pub, current_status);
-// 			}
-// 		}
-// 		break;
-
-// 	default:
-// 		break;
-// 	}
-
-// }
-
-// void update_state_machine_subsystem_enabled(int status_pub, struct vehicle_status_s *current_status, subsystem_type_t *subsystem_type)
-// {
-// 	current_status->onboard_control_sensors_enabled |= 1 << *subsystem_type;
-// 	current_status->counter++;
-// 	current_status->timestamp = hrt_absolute_time();
-// 	orb_publish(ORB_ID(vehicle_status), status_pub, current_status);
-// }
-
-// void update_state_machine_subsystem_disabled(int status_pub, struct vehicle_status_s *current_status, subsystem_type_t *subsystem_type)
-// {
-// 	current_status->onboard_control_sensors_enabled &= ~(1 << *subsystem_type);
-// 	current_status->counter++;
-// 	current_status->timestamp = hrt_absolute_time();
-// 	orb_publish(ORB_ID(vehicle_status), status_pub, current_status);
-
-// 	/* if a subsystem was disabled something went completely wrong */
-
-// 	switch (*subsystem_type) {
-// 	case SUBSYSTEM_TYPE_GYRO:
-// 		//global_data_send_mavlink_statustext_message_out("Commander: EMERGENCY - gyro disabled", MAV_SEVERITY_EMERGENCY);
-// 		state_machine_emergency_always_critical(status_pub, current_status);
-// 		break;
-
-// 	case SUBSYSTEM_TYPE_ACC:
-// 		//global_data_send_mavlink_statustext_message_out("Commander: EMERGENCY - accelerometer disabled", MAV_SEVERITY_EMERGENCY);
-// 		state_machine_emergency_always_critical(status_pub, current_status);
-// 		break;
-
-// 	case SUBSYSTEM_TYPE_MAG:
-// 		//global_data_send_mavlink_statustext_message_out("Commander: EMERGENCY - magnetometer disabled", MAV_SEVERITY_EMERGENCY);
-// 		state_machine_emergency_always_critical(status_pub, current_status);
-// 		break;
-
-// 	case SUBSYSTEM_TYPE_GPS:
-// 		{
-// 			uint8_t flight_env = (uint8_t)(global_data_parameter_storage->pm.param_values[PARAM_FLIGHT_ENV]);
-
-// 			if (flight_env == PX4_FLIGHT_ENVIRONMENT_OUTDOOR) {
-// 				//global_data_send_mavlink_statustext_message_out("Commander: EMERGENCY - GPS disabled", MAV_SEVERITY_EMERGENCY);
-// 				state_machine_emergency(status_pub, current_status);
-// 			}
-// 		}
-// 		break;
-
-// 	default:
-// 		break;
-// 	}
-
-// }
-
-
-///* END SUBSYSTEM/EMERGENCY FUNCTIONS*/
-//
-//int update_state_machine_mode_request(int status_pub, struct vehicle_status_s *current_status, const int mavlink_fd, uint8_t mode)
-//{
-//	int ret = 1;
-//
-////	/* Switch on HIL if in standby and not already in HIL mode */
-////	if ((mode & VEHICLE_MODE_FLAG_HIL_ENABLED)
-////	    && !current_status->flag_hil_enabled) {
-////		if ((current_status->state_machine == SYSTEM_STATE_STANDBY)) {
-////			/* Enable HIL on request */
-////			current_status->flag_hil_enabled = true;
-////			ret = OK;
-////			state_machine_publish(status_pub, current_status, mavlink_fd);
-////			publish_armed_status(current_status);
-////			printf("[cmd] Enabling HIL, locking down all actuators for safety.\n\t(Arming the system will not activate them while in HIL mode)\n");
-////
-////		} else if (current_status->state_machine != SYSTEM_STATE_STANDBY &&
-////			   current_status->flag_fmu_armed) {
-////
-////			mavlink_log_critical(mavlink_fd, "REJECTING HIL, disarm first!")
-////
-////		} else {
-////
-////			mavlink_log_critical(mavlink_fd, "REJECTING HIL, not in standby.")
-////		}
-////	}
-//
-//	/* switch manual / auto */
-//	if (mode & VEHICLE_MODE_FLAG_AUTO_ENABLED) {
-//		update_state_machine_mode_auto(status_pub, current_status, mavlink_fd);
-//
-//	} else if (mode & VEHICLE_MODE_FLAG_STABILIZED_ENABLED) {
-//		update_state_machine_mode_stabilized(status_pub, current_status, mavlink_fd);
-//
-//	} else if (mode & VEHICLE_MODE_FLAG_GUIDED_ENABLED) {
-//		update_state_machine_mode_guided(status_pub, current_status, mavlink_fd);
-//
-//	} else if (mode & VEHICLE_MODE_FLAG_MANUAL_INPUT_ENABLED) {
-//		update_state_machine_mode_manual(status_pub, current_status, mavlink_fd);
-//	}
-//
-//	/* vehicle is disarmed, mode requests arming */
-//	if (!(current_status->flag_fmu_armed) && (mode & VEHICLE_MODE_FLAG_SAFETY_ARMED)) {
-//		/* only arm in standby state */
-//		// XXX REMOVE
-//		if (current_status->state_machine == SYSTEM_STATE_STANDBY || current_status->state_machine == SYSTEM_STATE_PREFLIGHT) {
-//			do_state_update(status_pub, current_status, mavlink_fd, (commander_state_machine_t)SYSTEM_STATE_GROUND_READY);
-//			ret = OK;
-//			printf("[cmd] arming due to command request\n");
-//		}
-//	}
-//
-//	/* vehicle is armed, mode requests disarming */
-//	if (current_status->flag_fmu_armed && !(mode & VEHICLE_MODE_FLAG_SAFETY_ARMED)) {
-//		/* only disarm in ground ready */
-//		if (current_status->state_machine == SYSTEM_STATE_GROUND_READY) {
-//			do_state_update(status_pub, current_status, mavlink_fd, (commander_state_machine_t)SYSTEM_STATE_STANDBY);
-//			ret = OK;
-//			printf("[cmd] disarming due to command request\n");
-//		}
-//	}
-//
-//	/* NEVER actually switch off HIL without reboot */
-//	if (current_status->flag_hil_enabled && !(mode & VEHICLE_MODE_FLAG_HIL_ENABLED)) {
-//		warnx("DENYING request to switch off HIL. Please power cycle (safety reasons)\n");
-//		mavlink_log_critical(mavlink_fd, "Power-cycle to exit HIL");
-//		ret = ERROR;
-//	}
-//
-//	return ret;
-//}
+	if (!status->is_rotary_wing) {
+		int fd = open(AIRSPEED_DEVICE_PATH, O_RDONLY);
 
+		if (fd < 0) {
+			mavlink_log_critical(mavlink_fd, "#audio: FAIL: AIRSPEED SENSOR MISSING");
+			ret = fd;
+			goto system_eval;
+		}
+
+		struct differential_pressure_s diff_pres;
+
+		ret = read(fd, &diff_pres, sizeof(diff_pres));
+
+		if (ret == sizeof(diff_pres)) {
+			if (fabsf(diff_pres.differential_pressure_filtered_pa > 5.0f)) {
+				mavlink_log_critical(mavlink_fd, "#audio: WARNING AIRSPEED CALIBRATION MISSING");
+				// XXX do not make this fatal yet
+				ret = OK;
+			}
+		} else {
+			mavlink_log_critical(mavlink_fd, "#audio: FAIL: AIRSPEED READ");
+			/* this is frickin' fatal */
+			ret = ERROR;
+			goto system_eval;
+		}
+	}
+
+system_eval:
+	close(fd);
+	return ret;
+}
diff --git a/src/modules/commander/state_machine_helper.h b/src/modules/commander/state_machine_helper.h
index f04879ff9..11072403e 100644
--- a/src/modules/commander/state_machine_helper.h
+++ b/src/modules/commander/state_machine_helper.h
@@ -56,25 +56,15 @@ typedef enum {
 
 } transition_result_t;
 
-transition_result_t arming_state_transition(struct vehicle_status_s *current_state, const struct safety_s *safety,
-		arming_state_t new_arming_state, struct actuator_armed_s *armed);
-
 bool is_safe(const struct vehicle_status_s *current_state, const struct safety_s *safety, const struct actuator_armed_s *armed);
 
-bool check_arming_state_changed();
+transition_result_t arming_state_transition(struct vehicle_status_s *current_state, const struct safety_s *safety,
+		arming_state_t new_arming_state, struct actuator_armed_s *armed, const int mavlink_fd);
 
 transition_result_t main_state_transition(struct vehicle_status_s *current_state, main_state_t new_main_state);
 
-bool check_main_state_changed();
-
-transition_result_t failsafe_state_transition(struct vehicle_status_s *status, failsafe_state_t new_failsafe_state);
-
-bool check_navigation_state_changed();
-
-bool check_failsafe_state_changed();
-
-void set_navigation_state_changed();
+transition_result_t hil_state_transition(hil_state_t new_state, int status_pub, struct vehicle_status_s *current_state, const int mavlink_fd);
 
-int hil_state_transition(hil_state_t new_state, int status_pub, struct vehicle_status_s *current_state, const int mavlink_fd);
+bool set_nav_state(struct vehicle_status_s *status, const bool data_link_loss_enabled, const bool mission_finished);
 
 #endif /* STATE_MACHINE_HELPER_H_ */
diff --git a/src/modules/dataman/dataman.c b/src/modules/dataman/dataman.c
index 34d20e485..406293bda 100644
--- a/src/modules/dataman/dataman.c
+++ b/src/modules/dataman/dataman.c
@@ -1,10 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
- *   Author: 	Jean Cyr
- *              Lorenz Meier
- *              Julian Oes
- *              Thomas Gubler
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -37,6 +33,11 @@
 /**
  * @file dataman.c
  * DATAMANAGER driver.
+ *
+ * @author Jean Cyr
+ * @author Lorenz Meier
+ * @author Julian Oes
+ * @author Thomas Gubler
  */
 
 #include <nuttx/config.h>
@@ -44,9 +45,12 @@
 #include <stdlib.h>
 #include <fcntl.h>
 #include <systemlib/systemlib.h>
+#include <systemlib/err.h>
 #include <queue.h>
+#include <string.h>
 
 #include "dataman.h"
+#include <systemlib/param/param.h>
 
 /**
  * data manager app start / stop handling function
@@ -60,7 +64,7 @@ __EXPORT ssize_t dm_write(dm_item_t  item, unsigned char index, dm_persitence_t
 __EXPORT int dm_clear(dm_item_t item);
 __EXPORT int dm_restart(dm_reset_reason restart_type);
 
-/* Types of function calls supported by the worker task */
+/** Types of function calls supported by the worker task */
 typedef enum {
 	dm_write_func = 0,
 	dm_read_func,
@@ -69,11 +73,12 @@ typedef enum {
 	dm_number_of_funcs
 } dm_function_t;
 
-/* Work task work item */
+/** Work task work item */
 typedef struct {
 	sq_entry_t link;	/**< list linkage */
 	sem_t wait_sem;
-	dm_function_t func;
+	unsigned char first;
+	unsigned char func;
 	ssize_t result;
 	union {
 		struct {
@@ -98,6 +103,8 @@ typedef struct {
 	};
 } work_q_item_t;
 
+const size_t k_work_item_allocation_chunk_size = 8;
+
 /* Usage statistics */
 static unsigned g_func_counts[dm_number_of_funcs];
 
@@ -175,9 +182,23 @@ create_work_item(void)
 
 	unlock_queue(&g_free_q);
 
-	/* If we there weren't any free items then obtain memory for a new one */
-	if (item == NULL)
-		item = (work_q_item_t *)malloc(sizeof(work_q_item_t));
+	/* If we there weren't any free items then obtain memory for a new ones */
+	if (item == NULL) {
+		item = (work_q_item_t *)malloc(k_work_item_allocation_chunk_size * sizeof(work_q_item_t));
+		if (item) {
+			item->first = 1;
+			lock_queue(&g_free_q);
+			for (size_t i = 1; i < k_work_item_allocation_chunk_size; i++) {
+				(item + i)->first = 0;
+				sq_addfirst(&(item + i)->link, &(g_free_q.q));
+			}
+			/* Update the queue size and potentially the maximum queue size */
+			g_free_q.size += k_work_item_allocation_chunk_size - 1;
+			if (g_free_q.size > g_free_q.max_size)
+				g_free_q.max_size = g_free_q.size;
+			unlock_queue(&g_free_q);
+		}
+	}
 
 	/* If we got one then lock the item*/
 	if (item)
@@ -409,31 +430,31 @@ _clear(dm_item_t item)
 	return result;
 }
 
-/* Tell the data manager about the type of the last reset */
+/** Tell the data manager about the type of the last reset */
 static int
 _restart(dm_reset_reason reason)
 {
 	unsigned char buffer[2];
-	int offset, result = 0;
+	int offset = 0, result = 0;
 
 	/* We need to scan the entire file and invalidate and data that should not persist after the last reset */
 
 	/* Loop through all of the data segments and delete those that are not persistent */
-	offset = 0;
-
 	while (1) {
 		size_t len;
 
 		/* Get data segment at current offset */
 		if (lseek(g_task_fd, offset, SEEK_SET) != offset) {
-			result = -1;
+			/* must be at eof */
 			break;
 		}
 
 		len = read(g_task_fd, buffer, sizeof(buffer));
 
-		if (len == 0)
+		if (len != sizeof(buffer)) {
+			/* must be at eof */
 			break;
+		}
 
 		/* check if segment contains data */
 		if (buffer[0]) {
@@ -441,12 +462,12 @@ _restart(dm_reset_reason reason)
 
 			/* Whether data gets deleted depends on reset type and data segment's persistence setting */
 			if (reason == DM_INIT_REASON_POWER_ON) {
-				if (buffer[1] != DM_PERSIST_POWER_ON_RESET) {
+				if (buffer[1] > DM_PERSIST_POWER_ON_RESET) {
 					clear_entry = 1;
 				}
 
 			} else {
-				if ((buffer[1] != DM_PERSIST_POWER_ON_RESET) && (buffer[1] != DM_PERSIST_IN_FLIGHT_RESET)) {
+				if (buffer[1] > DM_PERSIST_IN_FLIGHT_RESET) {
 					clear_entry = 1;
 				}
 			}
@@ -478,7 +499,7 @@ _restart(dm_reset_reason reason)
 	return result;
 }
 
-/* write to the data manager file */
+/** Write to the data manager file */
 __EXPORT ssize_t
 dm_write(dm_item_t item, unsigned char index, dm_persitence_t persistence, const void *buf, size_t count)
 {
@@ -503,7 +524,7 @@ dm_write(dm_item_t item, unsigned char index, dm_persitence_t persistence, const
 	return (ssize_t)enqueue_work_item_and_wait_for_result(work);
 }
 
-/* Retrieve from the data manager file */
+/** Retrieve from the data manager file */
 __EXPORT ssize_t
 dm_read(dm_item_t item, unsigned char index, void *buf, size_t count)
 {
@@ -594,6 +615,20 @@ task_main(int argc, char *argv[])
 
 	sem_init(&g_work_queued_sema, 1, 0);
 
+	/* See if the data manage file exists and is a multiple of the sector size */
+	g_task_fd = open(k_data_manager_device_path, O_RDONLY | O_BINARY);
+	if (g_task_fd >= 0) {
+		/* File exists, check its size */
+		int file_size = lseek(g_task_fd, 0, SEEK_END);
+		if ((file_size % k_sector_size) != 0) {
+			warnx("Incompatible data manager file %s, resetting it", k_data_manager_device_path);
+			close(g_task_fd);
+			unlink(k_data_manager_device_path);
+		}
+		else
+			close(g_task_fd);
+	}
+
 	/* Open or create the data manager file */
 	g_task_fd = open(k_data_manager_device_path, O_RDWR | O_CREAT | O_BINARY);
 
@@ -603,7 +638,7 @@ task_main(int argc, char *argv[])
 		return -1;
 	}
 
-	if (lseek(g_task_fd, max_offset, SEEK_SET) != max_offset) {
+	if ((unsigned)lseek(g_task_fd, max_offset, SEEK_SET) != max_offset) {
 		close(g_task_fd);
 		warnx("Could not seek data manager file %s", k_data_manager_device_path);
 		sem_post(&g_init_sema); /* Don't want to hang startup */
@@ -612,6 +647,23 @@ task_main(int argc, char *argv[])
 
 	fsync(g_task_fd);
 
+	/* see if we need to erase any items based on restart type */
+	int sys_restart_val;
+	if (param_get(param_find("SYS_RESTART_TYPE"), &sys_restart_val) == OK) {
+		if (sys_restart_val == DM_INIT_REASON_POWER_ON) {
+			warnx("Power on restart");
+			_restart(DM_INIT_REASON_POWER_ON);
+		}
+		else if (sys_restart_val == DM_INIT_REASON_IN_FLIGHT) {
+			warnx("In flight restart");
+			_restart(DM_INIT_REASON_IN_FLIGHT);
+		}
+		else
+			warnx("Unknown restart");
+	}
+	else
+		warnx("Unknown restart");
+
 	/* We use two file descriptors, one for the caller context and one for the worker thread */
 	/* They are actually the same but we need to some way to reject caller request while the */
 	/* worker thread is shutting down but still processing requests */
@@ -684,8 +736,8 @@ task_main(int argc, char *argv[])
 	for (;;) {
 		if ((work = (work_q_item_t *)sq_remfirst(&(g_free_q.q))) == NULL)
 			break;
-
-		free(work);
+		if (work->first)
+			free(work);
 	}
 
 	destroy_q(&g_work_q);
@@ -703,12 +755,12 @@ start(void)
 	sem_init(&g_init_sema, 1, 0);
 
 	/* start the worker thread */
-	if ((task = task_spawn_cmd("dataman", SCHED_DEFAULT, SCHED_PRIORITY_MAX - 5, 2048, task_main, NULL)) <= 0) {
+	if ((task = task_spawn_cmd("dataman", SCHED_DEFAULT, SCHED_PRIORITY_MAX - 5, 2000, task_main, NULL)) <= 0) {
 		warn("task start failed");
 		return -1;
 	}
 
-	/* wait for the thread to actuall initialize */
+	/* wait for the thread to actually initialize */
 	sem_wait(&g_init_sema);
 	sem_destroy(&g_init_sema);
 
@@ -776,4 +828,3 @@ dataman_main(int argc, char *argv[])
 
 	exit(1);
 }
-
diff --git a/src/modules/dataman/dataman.h b/src/modules/dataman/dataman.h
index a70638ccc..1dfb26f73 100644
--- a/src/modules/dataman/dataman.h
+++ b/src/modules/dataman/dataman.h
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -46,7 +46,7 @@
 extern "C" {
 #endif
 
-	/* Types of items that the data manager can store */
+	/** Types of items that the data manager can store */
 	typedef enum {
 		DM_KEY_SAFE_POINTS = 0,		/* Safe points coordinates, safe point 0 is home point */
 		DM_KEY_FENCE_POINTS,		/* Fence vertex coordinates */
@@ -56,7 +56,7 @@ extern "C" {
 		DM_KEY_NUM_KEYS			/* Total number of item types defined */
 	} dm_item_t;
 
-	/* The maximum number of instances for each item type */
+	/** The maximum number of instances for each item type */
 	enum {
 		DM_KEY_SAFE_POINTS_MAX = 8,
 		DM_KEY_FENCE_POINTS_MAX = GEOFENCE_MAX_VERTICES,
@@ -65,23 +65,24 @@ extern "C" {
 		DM_KEY_WAYPOINTS_ONBOARD_MAX = NUM_MISSIONS_SUPPORTED
 	};
 
-	/* Data persistence levels */
+	/** Data persistence levels */
 	typedef enum {
 		DM_PERSIST_POWER_ON_RESET = 0,	/* Data survives all resets */
 		DM_PERSIST_IN_FLIGHT_RESET,     /* Data survives in-flight resets only */
 		DM_PERSIST_VOLATILE             /* Data does not survive resets */
 	} dm_persitence_t;
 
-	/* The reason for the last reset */
+	/** The reason for the last reset */
 	typedef enum {
 		DM_INIT_REASON_POWER_ON = 0,	/* Data survives resets */
-		DM_INIT_REASON_IN_FLIGHT	/* Data survives in-flight resets only */
+		DM_INIT_REASON_IN_FLIGHT,		/* Data survives in-flight resets only */
+		DM_INIT_REASON_VOLATILE			/* Data does not survive reset */
 	} dm_reset_reason;
 
-	/* Maximum size in bytes of a single item instance */
-	#define DM_MAX_DATA_SIZE 126
+	/** Maximum size in bytes of a single item instance */
+	#define DM_MAX_DATA_SIZE 124
 
-	/* Retrieve from the data manager store */
+	/** Retrieve from the data manager store */
 	__EXPORT ssize_t
 	dm_read(
 		dm_item_t item,			/* The item type to retrieve */
@@ -90,7 +91,7 @@ extern "C" {
 		size_t buflen			/* Length in bytes of data to retrieve */
 	);
 
-	/* write to the data manager store */
+	/** write to the data manager store */
 	__EXPORT ssize_t
 	dm_write(
 		dm_item_t  item,		/* The item type to store */
@@ -100,13 +101,13 @@ extern "C" {
 		size_t buflen			/* Length in bytes of data to retrieve */
 	);
 
-	/* Retrieve from the data manager store */
+	/** Erase all items of this type */
 	__EXPORT int
 	dm_clear(
 		dm_item_t item			/* The item type to clear */
 		);
 
-	/* Tell the data manager about the type of the last reset */
+	/** Tell the data manager about the type of the last reset */
 	__EXPORT int
 	dm_restart(
 		dm_reset_reason restart_type	/* The last reset type */
diff --git a/src/modules/dataman/module.mk b/src/modules/dataman/module.mk
index 27670dd3f..234607b3d 100644
--- a/src/modules/dataman/module.mk
+++ b/src/modules/dataman/module.mk
@@ -38,3 +38,5 @@
 MODULE_COMMAND	= dataman
 
 SRCS		= dataman.c
+
+MODULE_STACKSIZE = 1200
diff --git a/src/modules/ekf_att_pos_estimator/ekf_att_pos_estimator_main.cpp b/src/modules/ekf_att_pos_estimator/ekf_att_pos_estimator_main.cpp
new file mode 100644
index 000000000..e4f805dc0
--- /dev/null
+++ b/src/modules/ekf_att_pos_estimator/ekf_att_pos_estimator_main.cpp
@@ -0,0 +1,1734 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file ekf_att_pos_estimator_main.cpp
+ * Implementation of the attitude and position estimator.
+ *
+ * @author Paul Riseborough <p_riseborough@live.com.au>
+ * @author Lorenz Meier <lm@inf.ethz.ch>
+ */
+
+#include <nuttx/config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <math.h>
+#include <poll.h>
+#include <time.h>
+#include <float.h>
+
+#define SENSOR_COMBINED_SUB
+
+#include <drivers/drv_hrt.h>
+#include <drivers/drv_gyro.h>
+#include <drivers/drv_accel.h>
+#include <drivers/drv_mag.h>
+#include <drivers/drv_baro.h>
+#ifdef SENSOR_COMBINED_SUB
+#include <uORB/topics/sensor_combined.h>
+#endif
+#include <arch/board/board.h>
+#include <uORB/uORB.h>
+#include <uORB/topics/airspeed.h>
+#include <uORB/topics/vehicle_global_position.h>
+#include <uORB/topics/vehicle_local_position.h>
+#include <uORB/topics/vehicle_gps_position.h>
+#include <uORB/topics/vehicle_attitude.h>
+#include <uORB/topics/actuator_controls.h>
+#include <uORB/topics/vehicle_status.h>
+#include <uORB/topics/parameter_update.h>
+#include <uORB/topics/estimator_status.h>
+#include <uORB/topics/actuator_armed.h>
+#include <uORB/topics/home_position.h>
+#include <uORB/topics/wind_estimate.h>
+#include <systemlib/param/param.h>
+#include <systemlib/err.h>
+#include <geo/geo.h>
+#include <systemlib/perf_counter.h>
+#include <systemlib/systemlib.h>
+#include <mathlib/mathlib.h>
+#include <mavlink/mavlink_log.h>
+
+#include "estimator_23states.h"
+
+
+
+/**
+ * estimator app start / stop handling function
+ *
+ * @ingroup apps
+ */
+extern "C" __EXPORT int ekf_att_pos_estimator_main(int argc, char *argv[]);
+
+__EXPORT uint32_t millis();
+
+static uint64_t IMUmsec = 0;
+static const uint64_t FILTER_INIT_DELAY = 1 * 1000 * 1000;
+
+uint32_t millis()
+{
+	return IMUmsec;
+}
+
+class FixedwingEstimator
+{
+public:
+	/**
+	 * Constructor
+	 */
+	FixedwingEstimator();
+
+	/**
+	 * Destructor, also kills the sensors task.
+	 */
+	~FixedwingEstimator();
+
+	/**
+	 * Start the sensors task.
+	 *
+	 * @return	OK on success.
+	 */
+	int		start();
+
+	/**
+	 * Print the current status.
+	 */
+	void		print_status();
+
+	/**
+	 * Trip the filter by feeding it NaN values.
+	 */
+	int		trip_nan();
+
+	/**
+	 * Enable logging.
+	 *
+	 * @param	enable Set to true to enable logging, false to disable
+	 */
+	int		enable_logging(bool enable);
+
+	/**
+	 * Set debug level.
+	 *
+	 * @param	debug Desired debug level - 0 to disable.
+	 */
+	int		set_debuglevel(unsigned debug) { _debug = debug; return 0; }
+
+private:
+
+	bool		_task_should_exit;		/**< if true, sensor task should exit */
+	int		_estimator_task;			/**< task handle for sensor task */
+#ifndef SENSOR_COMBINED_SUB
+	int		_gyro_sub;			/**< gyro sensor subscription */
+	int		_accel_sub;			/**< accel sensor subscription */
+	int		_mag_sub;			/**< mag sensor subscription */
+#else
+	int		_sensor_combined_sub;
+#endif
+	int		_airspeed_sub;			/**< airspeed subscription */
+	int		_baro_sub;			/**< barometer subscription */
+	int		_gps_sub;			/**< GPS subscription */
+	int		_vstatus_sub;			/**< vehicle status subscription */
+	int 		_params_sub;			/**< notification of parameter updates */
+	int 		_manual_control_sub;		/**< notification of manual control updates */
+	int		_mission_sub;
+	int		_home_sub;			/**< home position as defined by commander / user */
+
+	orb_advert_t	_att_pub;			/**< vehicle attitude */
+	orb_advert_t	_global_pos_pub;		/**< global position */
+	orb_advert_t	_local_pos_pub;			/**< position in local frame */
+	orb_advert_t	_estimator_status_pub;		/**< status of the estimator */
+	orb_advert_t	_wind_pub;			/**< wind estimate */
+
+	struct vehicle_attitude_s			_att;			/**< vehicle attitude */
+	struct gyro_report				_gyro;
+	struct accel_report				_accel;
+	struct mag_report				_mag;
+	struct airspeed_s				_airspeed;		/**< airspeed */
+	struct baro_report				_baro;			/**< baro readings */
+	struct vehicle_status_s				_vstatus;		/**< vehicle status */
+	struct vehicle_global_position_s		_global_pos;		/**< global vehicle position */
+	struct vehicle_local_position_s			_local_pos;		/**< local vehicle position */
+	struct vehicle_gps_position_s			_gps;			/**< GPS position */
+	struct wind_estimate_s				_wind;			/**< Wind estimate */
+
+	struct gyro_scale				_gyro_offsets;
+	struct accel_scale				_accel_offsets;
+	struct mag_scale				_mag_offsets;
+
+#ifdef SENSOR_COMBINED_SUB
+	struct sensor_combined_s			_sensor_combined;
+#endif
+
+	struct map_projection_reference_s	_pos_ref;
+
+	float						_baro_ref;		/**< barometer reference altitude */
+	float						_baro_ref_offset;	/**< offset between initial baro reference and GPS init baro altitude */
+	float						_baro_gps_offset;	/**< offset between baro altitude (at GPS init time) and GPS altitude */
+
+	perf_counter_t	_loop_perf;			///< loop performance counter
+	perf_counter_t	_perf_gyro;			///<local performance counter for gyro updates
+	perf_counter_t	_perf_mag;			///<local performance counter for mag updates
+	perf_counter_t	_perf_gps;			///<local performance counter for gps updates
+	perf_counter_t	_perf_baro;			///<local performance counter for baro updates
+	perf_counter_t	_perf_airspeed;			///<local performance counter for airspeed updates
+	perf_counter_t	_perf_reset;			///<local performance counter for filter resets
+
+	bool						_baro_init;
+	bool						_gps_initialized;
+	hrt_abstime					_gps_start_time;
+	hrt_abstime					_filter_start_time;
+	hrt_abstime					_last_sensor_timestamp;
+	hrt_abstime					_last_run;
+	bool						_gyro_valid;
+	bool						_accel_valid;
+	bool						_mag_valid;
+	bool						_ekf_logging;		///< log EKF state
+	unsigned					_debug;			///< debug level - default 0
+
+	int						_mavlink_fd;
+
+	struct {
+		int32_t	vel_delay_ms;
+		int32_t	pos_delay_ms;
+		int32_t	height_delay_ms;
+		int32_t	mag_delay_ms;
+		int32_t	tas_delay_ms;
+		float velne_noise;
+		float veld_noise;
+		float posne_noise;
+		float posd_noise;
+		float mag_noise;
+		float gyro_pnoise;
+		float acc_pnoise;
+		float gbias_pnoise;
+		float abias_pnoise;
+		float mage_pnoise;
+		float magb_pnoise;
+		float eas_noise;
+		float pos_stddev_threshold;
+	}		_parameters;			/**< local copies of interesting parameters */
+
+	struct {
+		param_t vel_delay_ms;
+		param_t	pos_delay_ms;
+		param_t	height_delay_ms;
+		param_t	mag_delay_ms;
+		param_t	tas_delay_ms;
+		param_t velne_noise;
+		param_t veld_noise;
+		param_t posne_noise;
+		param_t posd_noise;
+		param_t mag_noise;
+		param_t gyro_pnoise;
+		param_t acc_pnoise;
+		param_t gbias_pnoise;
+		param_t abias_pnoise;
+		param_t mage_pnoise;
+		param_t magb_pnoise;
+		param_t eas_noise;
+		param_t pos_stddev_threshold;
+	}		_parameter_handles;		/**< handles for interesting parameters */
+
+	AttPosEKF					*_ekf;
+
+	float						_velocity_xy_filtered;
+	float						_velocity_z_filtered;
+	float						_airspeed_filtered;
+
+	/**
+	 * Update our local parameter cache.
+	 */
+	int		parameters_update();
+
+	/**
+	 * Update control outputs
+	 *
+	 */
+	void		control_update();
+
+	/**
+	 * Check for changes in vehicle status.
+	 */
+	void		vehicle_status_poll();
+
+	/**
+	 * Shim for calling task_main from task_create.
+	 */
+	static void	task_main_trampoline(int argc, char *argv[]);
+
+	/**
+	 * Main filter task.
+	 */
+	void		task_main();
+
+	/**
+	 * Check filter sanity state
+	 *
+	 * @return zero if ok, non-zero for a filter error condition.
+	 */
+	int		check_filter_state();
+};
+
+namespace estimator
+{
+
+/* oddly, ERROR is not defined for c++ */
+#ifdef ERROR
+# undef ERROR
+#endif
+static const int ERROR = -1;
+
+FixedwingEstimator	*g_estimator;
+}
+
+FixedwingEstimator::FixedwingEstimator() :
+
+	_task_should_exit(false),
+	_estimator_task(-1),
+
+/* subscriptions */
+#ifndef SENSOR_COMBINED_SUB
+	_gyro_sub(-1),
+	_accel_sub(-1),
+	_mag_sub(-1),
+#else
+	_sensor_combined_sub(-1),
+#endif
+	_airspeed_sub(-1),
+	_baro_sub(-1),
+	_gps_sub(-1),
+	_vstatus_sub(-1),
+	_params_sub(-1),
+	_manual_control_sub(-1),
+	_mission_sub(-1),
+	_home_sub(-1),
+
+/* publications */
+	_att_pub(-1),
+	_global_pos_pub(-1),
+	_local_pos_pub(-1),
+	_estimator_status_pub(-1),
+	_wind_pub(-1),
+
+	_att({}),
+	_gyro({}),
+	_accel({}),
+	_mag({}),
+	_airspeed({}),
+	_baro({}),
+	_vstatus({}),
+	_global_pos({}),
+	_local_pos({}),
+	_gps({}),
+	_wind({}),
+
+	_gyro_offsets({}),
+	_accel_offsets({}),
+	_mag_offsets({}),
+
+	#ifdef SENSOR_COMBINED_SUB
+	_sensor_combined({}),
+	#endif
+
+	_baro_ref(0.0f),
+	_baro_ref_offset(0.0f),
+	_baro_gps_offset(0.0f),
+
+/* performance counters */
+	_loop_perf(perf_alloc(PC_ELAPSED, "ekf_att_pos_estimator")),
+	_perf_gyro(perf_alloc(PC_INTERVAL, "ekf_att_pos_gyro_upd")),
+	_perf_mag(perf_alloc(PC_INTERVAL, "ekf_att_pos_mag_upd")),
+	_perf_gps(perf_alloc(PC_INTERVAL, "ekf_att_pos_gps_upd")),
+	_perf_baro(perf_alloc(PC_INTERVAL, "ekf_att_pos_baro_upd")),
+	_perf_airspeed(perf_alloc(PC_INTERVAL, "ekf_att_pos_aspd_upd")),
+	_perf_reset(perf_alloc(PC_COUNT, "ekf_att_pos_reset")),
+
+/* states */
+	_baro_init(false),
+	_gps_initialized(false),
+	_gyro_valid(false),
+	_accel_valid(false),
+	_mag_valid(false),
+	_ekf_logging(true),
+	_debug(0),
+	_mavlink_fd(-1),
+	_ekf(nullptr),
+	_velocity_xy_filtered(0.0f),
+	_velocity_z_filtered(0.0f),
+	_airspeed_filtered(0.0f)
+{
+
+	_last_run = hrt_absolute_time();
+
+	_parameter_handles.vel_delay_ms = param_find("PE_VEL_DELAY_MS");
+	_parameter_handles.pos_delay_ms = param_find("PE_POS_DELAY_MS");
+	_parameter_handles.height_delay_ms = param_find("PE_HGT_DELAY_MS");
+	_parameter_handles.mag_delay_ms = param_find("PE_MAG_DELAY_MS");
+	_parameter_handles.tas_delay_ms = param_find("PE_TAS_DELAY_MS");
+	_parameter_handles.velne_noise = param_find("PE_VELNE_NOISE");
+	_parameter_handles.veld_noise = param_find("PE_VELD_NOISE");
+	_parameter_handles.posne_noise = param_find("PE_POSNE_NOISE");
+	_parameter_handles.posd_noise = param_find("PE_POSD_NOISE");
+	_parameter_handles.mag_noise = param_find("PE_MAG_NOISE");
+	_parameter_handles.gyro_pnoise = param_find("PE_GYRO_PNOISE");
+	_parameter_handles.acc_pnoise = param_find("PE_ACC_PNOISE");
+	_parameter_handles.gbias_pnoise = param_find("PE_GBIAS_PNOISE");
+	_parameter_handles.abias_pnoise = param_find("PE_ABIAS_PNOISE");
+	_parameter_handles.mage_pnoise = param_find("PE_MAGE_PNOISE");
+	_parameter_handles.magb_pnoise = param_find("PE_MAGB_PNOISE");
+	_parameter_handles.eas_noise = param_find("PE_EAS_NOISE");
+	_parameter_handles.pos_stddev_threshold = param_find("PE_POSDEV_INIT");
+
+	/* fetch initial parameter values */
+	parameters_update();
+
+	/* get offsets */
+
+	int fd, res;
+
+	fd = open(GYRO_DEVICE_PATH, O_RDONLY);
+
+	if (fd > 0) {
+		res = ioctl(fd, GYROIOCGSCALE, (long unsigned int)&_gyro_offsets);
+		close(fd);
+
+		if (res) {
+			warnx("G SCALE FAIL");
+		}
+	}
+
+	fd = open(ACCEL_DEVICE_PATH, O_RDONLY);
+
+	if (fd > 0) {
+		res = ioctl(fd, ACCELIOCGSCALE, (long unsigned int)&_accel_offsets);
+		close(fd);
+
+		if (res) {
+			warnx("A SCALE FAIL");
+		}
+	}
+
+	fd = open(MAG_DEVICE_PATH, O_RDONLY);
+
+	if (fd > 0) {
+		res = ioctl(fd, MAGIOCGSCALE, (long unsigned int)&_mag_offsets);
+		close(fd);
+
+		if (res) {
+			warnx("M SCALE FAIL");
+		}
+	}
+}
+
+FixedwingEstimator::~FixedwingEstimator()
+{
+	if (_estimator_task != -1) {
+
+		/* task wakes up every 100ms or so at the longest */
+		_task_should_exit = true;
+
+		/* wait for a second for the task to quit at our request */
+		unsigned i = 0;
+
+		do {
+			/* wait 20ms */
+			usleep(20000);
+
+			/* if we have given up, kill it */
+			if (++i > 50) {
+				task_delete(_estimator_task);
+				break;
+			}
+		} while (_estimator_task != -1);
+	}
+
+	delete _ekf;
+
+	estimator::g_estimator = nullptr;
+}
+
+int
+FixedwingEstimator::enable_logging(bool logging)
+{
+	_ekf_logging = logging;
+
+	return 0;
+}
+
+int
+FixedwingEstimator::parameters_update()
+{
+
+	param_get(_parameter_handles.vel_delay_ms, &(_parameters.vel_delay_ms));
+	param_get(_parameter_handles.pos_delay_ms, &(_parameters.pos_delay_ms));
+	param_get(_parameter_handles.height_delay_ms, &(_parameters.height_delay_ms));
+	param_get(_parameter_handles.mag_delay_ms, &(_parameters.mag_delay_ms));
+	param_get(_parameter_handles.tas_delay_ms, &(_parameters.tas_delay_ms));
+	param_get(_parameter_handles.velne_noise, &(_parameters.velne_noise));
+	param_get(_parameter_handles.veld_noise, &(_parameters.veld_noise));
+	param_get(_parameter_handles.posne_noise, &(_parameters.posne_noise));
+	param_get(_parameter_handles.posd_noise, &(_parameters.posd_noise));
+	param_get(_parameter_handles.mag_noise, &(_parameters.mag_noise));
+	param_get(_parameter_handles.gyro_pnoise, &(_parameters.gyro_pnoise));
+	param_get(_parameter_handles.acc_pnoise, &(_parameters.acc_pnoise));
+	param_get(_parameter_handles.gbias_pnoise, &(_parameters.gbias_pnoise));
+	param_get(_parameter_handles.abias_pnoise, &(_parameters.abias_pnoise));
+	param_get(_parameter_handles.mage_pnoise, &(_parameters.mage_pnoise));
+	param_get(_parameter_handles.magb_pnoise, &(_parameters.magb_pnoise));
+	param_get(_parameter_handles.eas_noise, &(_parameters.eas_noise));
+	param_get(_parameter_handles.pos_stddev_threshold, &(_parameters.pos_stddev_threshold));
+
+	if (_ekf) {
+		// _ekf->yawVarScale = 1.0f;
+		// _ekf->windVelSigma = 0.1f;
+		_ekf->dAngBiasSigma = _parameters.gbias_pnoise;
+		_ekf->dVelBiasSigma = _parameters.abias_pnoise;
+		_ekf->magEarthSigma = _parameters.mage_pnoise;
+		_ekf->magBodySigma  = _parameters.magb_pnoise;
+		// _ekf->gndHgtSigma  = 0.02f;
+		_ekf->vneSigma = _parameters.velne_noise;
+		_ekf->vdSigma = _parameters.veld_noise;
+		_ekf->posNeSigma = _parameters.posne_noise;
+		_ekf->posDSigma = _parameters.posd_noise;
+		_ekf->magMeasurementSigma = _parameters.mag_noise;
+		_ekf->gyroProcessNoise = _parameters.gyro_pnoise;
+        	_ekf->accelProcessNoise = _parameters.acc_pnoise;
+		_ekf->airspeedMeasurementSigma = _parameters.eas_noise;
+	}
+
+	return OK;
+}
+
+void
+FixedwingEstimator::vehicle_status_poll()
+{
+	bool vstatus_updated;
+
+	/* Check HIL state if vehicle status has changed */
+	orb_check(_vstatus_sub, &vstatus_updated);
+
+	if (vstatus_updated) {
+
+		orb_copy(ORB_ID(vehicle_status), _vstatus_sub, &_vstatus);
+	}
+}
+
+int
+FixedwingEstimator::check_filter_state()
+{
+	/*
+	 *    CHECK IF THE INPUT DATA IS SANE
+	 */
+
+	struct ekf_status_report ekf_report;
+
+	int check = _ekf->CheckAndBound(&ekf_report);
+
+	const char* ekfname = "att pos estimator: ";
+
+	switch (check) {
+		case 0:
+			/* all ok */
+			break;
+		case 1:
+		{
+			const char* str = "NaN in states, resetting";
+			warnx("%s", str);
+			mavlink_log_critical(_mavlink_fd, "%s%s", ekfname, str);
+			break;
+		}
+		case 2:
+		{
+			const char* str = "stale IMU data, resetting";
+			warnx("%s", str);
+			mavlink_log_critical(_mavlink_fd, "%s%s", ekfname, str);
+			break;
+		}
+		case 3:
+		{
+			const char* str = "switching to dynamic state";
+			warnx("%s", str);
+			mavlink_log_info(_mavlink_fd, "%s%s", ekfname, str);
+			break;
+		}
+		case 4:
+		{
+			const char* str = "excessive gyro offsets";
+			warnx("%s", str);
+			mavlink_log_info(_mavlink_fd, "%s%s", ekfname, str);
+			break;
+		}
+		case 5:
+		{
+			const char* str = "GPS velocity divergence";
+			warnx("%s", str);
+			mavlink_log_info(_mavlink_fd, "%s%s", ekfname, str);
+			break;
+		}
+		case 6:
+		{
+			const char* str = "excessive covariances";
+			warnx("%s", str);
+			mavlink_log_info(_mavlink_fd, "%s%s", ekfname, str);
+			break;
+		}
+
+		default:
+		{
+			const char* str = "unknown reset condition";
+			warnx("%s", str);
+			mavlink_log_critical(_mavlink_fd, "%s%s", ekfname, str);
+		}
+	}
+
+	struct estimator_status_report rep;
+	memset(&rep, 0, sizeof(rep));
+
+	// If error flag is set, we got a filter reset
+	if (check && ekf_report.error) {
+
+		// Count the reset condition
+		perf_count(_perf_reset);
+
+	} else if (_ekf_logging) {
+		_ekf->GetFilterState(&ekf_report);
+	}
+
+	if (_ekf_logging || check) {
+		rep.timestamp = hrt_absolute_time();
+
+		rep.nan_flags |= (((uint8_t)ekf_report.angNaN)		<< 0);
+		rep.nan_flags |= (((uint8_t)ekf_report.summedDelVelNaN)	<< 1);
+		rep.nan_flags |= (((uint8_t)ekf_report.KHNaN)		<< 2);
+		rep.nan_flags |= (((uint8_t)ekf_report.KHPNaN)		<< 3);
+		rep.nan_flags |= (((uint8_t)ekf_report.PNaN)		<< 4);
+		rep.nan_flags |= (((uint8_t)ekf_report.covarianceNaN)	<< 5);
+		rep.nan_flags |= (((uint8_t)ekf_report.kalmanGainsNaN)	<< 6);
+		rep.nan_flags |= (((uint8_t)ekf_report.statesNaN)	<< 7);
+
+		rep.health_flags |= (((uint8_t)ekf_report.velHealth)	<< 0);
+		rep.health_flags |= (((uint8_t)ekf_report.posHealth)	<< 1);
+		rep.health_flags |= (((uint8_t)ekf_report.hgtHealth)	<< 2);
+		rep.health_flags |= (((uint8_t)!ekf_report.gyroOffsetsExcessive)	<< 3);
+
+		rep.timeout_flags |= (((uint8_t)ekf_report.velTimeout)	<< 0);
+		rep.timeout_flags |= (((uint8_t)ekf_report.posTimeout)	<< 1);
+		rep.timeout_flags |= (((uint8_t)ekf_report.hgtTimeout)	<< 2);
+		rep.timeout_flags |= (((uint8_t)ekf_report.imuTimeout)	<< 3);
+
+		if (_debug > 10) {
+
+			if (rep.health_flags < ((1 << 0) | (1 << 1) | (1 << 2) | (1 << 3))) {
+				warnx("health: VEL:%s POS:%s HGT:%s OFFS:%s",
+					((rep.health_flags & (1 << 0)) ? "OK" : "ERR"),
+					((rep.health_flags & (1 << 1)) ? "OK" : "ERR"),
+					((rep.health_flags & (1 << 2)) ? "OK" : "ERR"),
+					((rep.health_flags & (1 << 3)) ? "OK" : "ERR"));
+			}
+
+			if (rep.timeout_flags) {
+				warnx("timeout: %s%s%s%s",
+					((rep.timeout_flags & (1 << 0)) ? "VEL " : ""),
+					((rep.timeout_flags & (1 << 1)) ? "POS " : ""),
+					((rep.timeout_flags & (1 << 2)) ? "HGT " : ""),
+					((rep.timeout_flags & (1 << 3)) ? "IMU " : ""));
+			}
+		}
+
+		// Copy all states or at least all that we can fit
+		unsigned ekf_n_states = ekf_report.n_states;
+		unsigned max_states = (sizeof(rep.states) / sizeof(rep.states[0]));
+		rep.n_states = (ekf_n_states < max_states) ? ekf_n_states : max_states;
+
+		for (unsigned i = 0; i < rep.n_states; i++) {
+			rep.states[i] = ekf_report.states[i];
+		}
+
+		for (unsigned i = 0; i < rep.n_states; i++) {
+			rep.states[i] = ekf_report.states[i];
+		}
+
+		if (_estimator_status_pub > 0) {
+			orb_publish(ORB_ID(estimator_status), _estimator_status_pub, &rep);
+		} else {
+			_estimator_status_pub = orb_advertise(ORB_ID(estimator_status), &rep);
+		}
+	}
+
+	return check;
+}
+
+void
+FixedwingEstimator::task_main_trampoline(int argc, char *argv[])
+{
+	estimator::g_estimator->task_main();
+}
+
+void
+FixedwingEstimator::task_main()
+{
+	_mavlink_fd = open(MAVLINK_LOG_DEVICE, 0);
+
+	_ekf = new AttPosEKF();
+	float dt = 0.0f; // time lapsed since last covariance prediction
+	_filter_start_time = hrt_absolute_time();
+
+	if (!_ekf) {
+		errx(1, "OUT OF MEM!");
+	}
+
+	/*
+	 * do subscriptions
+	 */
+	_baro_sub = orb_subscribe(ORB_ID(sensor_baro));
+	_airspeed_sub = orb_subscribe(ORB_ID(airspeed));
+	_gps_sub = orb_subscribe(ORB_ID(vehicle_gps_position));
+	_vstatus_sub = orb_subscribe(ORB_ID(vehicle_status));
+	_params_sub = orb_subscribe(ORB_ID(parameter_update));
+	_home_sub = orb_subscribe(ORB_ID(home_position));
+
+	/* rate limit vehicle status updates to 5Hz */
+	orb_set_interval(_vstatus_sub, 200);
+
+#ifndef SENSOR_COMBINED_SUB
+
+	_gyro_sub = orb_subscribe(ORB_ID(sensor_gyro));
+	_accel_sub = orb_subscribe(ORB_ID(sensor_accel));
+	_mag_sub = orb_subscribe(ORB_ID(sensor_mag));
+
+	/* rate limit gyro updates to 50 Hz */
+	/* XXX remove this!, BUT increase the data buffer size! */
+	orb_set_interval(_gyro_sub, 4);
+#else
+	_sensor_combined_sub = orb_subscribe(ORB_ID(sensor_combined));
+	/* XXX remove this!, BUT increase the data buffer size! */
+	orb_set_interval(_sensor_combined_sub, 9);
+#endif
+
+	/* sets also parameters in the EKF object */
+	parameters_update();
+
+	Vector3f lastAngRate = {0.0f, 0.0f, 0.0f};
+	Vector3f lastAccel = {0.0f, 0.0f, 0.0f};
+
+	/* wakeup source(s) */
+	struct pollfd fds[2];
+
+	/* Setup of loop */
+	fds[0].fd = _params_sub;
+	fds[0].events = POLLIN;
+#ifndef SENSOR_COMBINED_SUB
+	fds[1].fd = _gyro_sub;
+	fds[1].events = POLLIN;
+#else
+	fds[1].fd = _sensor_combined_sub;
+	fds[1].events = POLLIN;
+#endif
+
+	bool newDataGps = false;
+	bool newHgtData = false;
+	bool newAdsData = false;
+	bool newDataMag = false;
+
+	float posNED[3] = {0.0f, 0.0f, 0.0f}; // North, East Down position (m)
+
+	uint64_t last_gps = 0;
+	_gps.vel_n_m_s = 0.0f;
+	_gps.vel_e_m_s = 0.0f;
+	_gps.vel_d_m_s = 0.0f;
+
+	while (!_task_should_exit) {
+
+		/* wait for up to 500ms for data */
+		int pret = poll(&fds[0], (sizeof(fds) / sizeof(fds[0])), 100);
+
+		/* timed out - periodic check for _task_should_exit, etc. */
+		if (pret == 0)
+			continue;
+
+		/* this is undesirable but not much we can do - might want to flag unhappy status */
+		if (pret < 0) {
+			warn("POLL ERR %d, %d", pret, errno);
+			continue;
+		}
+
+		perf_begin(_loop_perf);
+
+		/* only update parameters if they changed */
+		if (fds[0].revents & POLLIN) {
+			/* read from param to clear updated flag */
+			struct parameter_update_s update;
+			orb_copy(ORB_ID(parameter_update), _params_sub, &update);
+
+			/* update parameters from storage */
+			parameters_update();
+		}
+
+		/* only run estimator if gyro updated */
+		if (fds[1].revents & POLLIN) {
+
+			/* check vehicle status for changes to publication state */
+			bool prev_hil = (_vstatus.hil_state == HIL_STATE_ON);
+			vehicle_status_poll();
+
+			bool accel_updated;
+			bool mag_updated;
+
+			perf_count(_perf_gyro);
+
+			/* Reset baro reference if switching to HIL, reset sensor states */
+			if (!prev_hil && (_vstatus.hil_state == HIL_STATE_ON)) {
+				/* system is in HIL now, wait for measurements to come in one last round */
+				usleep(60000);
+
+#ifndef SENSOR_COMBINED_SUB
+				orb_copy(ORB_ID(sensor_gyro), _gyro_sub, &_gyro);
+				orb_copy(ORB_ID(sensor_accel), _accel_sub, &_accel);
+				orb_copy(ORB_ID(sensor_mag), _mag_sub, &_mag);
+#else
+				/* now read all sensor publications to ensure all real sensor data is purged */
+				orb_copy(ORB_ID(sensor_combined), _sensor_combined_sub, &_sensor_combined);
+#endif
+
+				/* set sensors to de-initialized state */
+				_gyro_valid = false;
+				_accel_valid = false;
+				_mag_valid = false;
+
+				_baro_init = false;
+				_gps_initialized = false;
+				_last_sensor_timestamp = hrt_absolute_time();
+				_last_run = _last_sensor_timestamp;
+
+				_ekf->ZeroVariables();
+				_ekf->dtIMU = 0.01f;
+				_filter_start_time = _last_sensor_timestamp;
+
+				/* now skip this loop and get data on the next one, which will also re-init the filter */
+				continue;
+			}
+
+			/**
+			 *    PART ONE: COLLECT ALL DATA
+			 **/
+
+			/* load local copies */
+#ifndef SENSOR_COMBINED_SUB
+			orb_copy(ORB_ID(sensor_gyro), _gyro_sub, &_gyro);
+
+
+			orb_check(_accel_sub, &accel_updated);
+
+			if (accel_updated) {
+				orb_copy(ORB_ID(sensor_accel), _accel_sub, &_accel);
+			}
+
+			_last_sensor_timestamp = _gyro.timestamp;
+			IMUmsec = _gyro.timestamp / 1e3f;
+
+			float deltaT = (_gyro.timestamp - _last_run) / 1e6f;
+			_last_run = _gyro.timestamp;
+
+			/* guard against too large deltaT's */
+			if (!isfinite(deltaT) || deltaT > 1.0f || deltaT < 0.000001f) {
+				deltaT = 0.01f;
+			}
+
+
+			// Always store data, independent of init status
+			/* fill in last data set */
+			_ekf->dtIMU = deltaT;
+
+			if (isfinite(_gyro.x) &&
+				isfinite(_gyro.y) &&
+				isfinite(_gyro.z)) {
+				_ekf->angRate.x = _gyro.x;
+				_ekf->angRate.y = _gyro.y;
+				_ekf->angRate.z = _gyro.z;
+
+				if (!_gyro_valid) {
+					lastAngRate = _ekf->angRate;
+				}
+
+				_gyro_valid = true;
+			}
+
+			if (accel_updated) {
+				_ekf->accel.x = _accel.x;
+				_ekf->accel.y = _accel.y;
+				_ekf->accel.z = _accel.z;
+
+				if (!_accel_valid) {
+					lastAccel = _ekf->accel;
+				}
+
+				_accel_valid = true;
+			}
+
+			_ekf->dAngIMU = 0.5f * (angRate + lastAngRate) * dtIMU;
+			_ekf->lastAngRate = angRate;
+			_ekf->dVelIMU = 0.5f * (accel + lastAccel) * dtIMU;
+			_ekf->lastAccel = accel;
+
+
+#else
+			orb_copy(ORB_ID(sensor_combined), _sensor_combined_sub, &_sensor_combined);
+
+			static hrt_abstime last_accel = 0;
+			static hrt_abstime last_mag = 0;
+
+			if (last_accel != _sensor_combined.accelerometer_timestamp) {
+				accel_updated = true;
+			} else {
+				accel_updated = false;
+			}
+
+			last_accel = _sensor_combined.accelerometer_timestamp;
+
+
+			// Copy gyro and accel
+			_last_sensor_timestamp = _sensor_combined.timestamp;
+			IMUmsec = _sensor_combined.timestamp / 1e3f;
+
+			float deltaT = (_sensor_combined.timestamp - _last_run) / 1e6f;
+
+			/* guard against too large deltaT's */
+			if (!isfinite(deltaT) || deltaT > 1.0f || deltaT < 0.000001f) {
+				deltaT = 0.01f;
+			}
+
+			_last_run = _sensor_combined.timestamp;
+
+			// Always store data, independent of init status
+			/* fill in last data set */
+			_ekf->dtIMU = deltaT;
+
+			if (isfinite(_sensor_combined.gyro_rad_s[0]) &&
+				isfinite(_sensor_combined.gyro_rad_s[1]) &&
+				isfinite(_sensor_combined.gyro_rad_s[2])) {
+				_ekf->angRate.x = _sensor_combined.gyro_rad_s[0];
+				_ekf->angRate.y = _sensor_combined.gyro_rad_s[1];
+				_ekf->angRate.z = _sensor_combined.gyro_rad_s[2];
+
+				if (!_gyro_valid) {
+					lastAngRate = _ekf->angRate;
+				}
+
+				_gyro_valid = true;
+				perf_count(_perf_gyro);
+			}
+
+			if (accel_updated) {
+				_ekf->accel.x = _sensor_combined.accelerometer_m_s2[0];
+				_ekf->accel.y = _sensor_combined.accelerometer_m_s2[1];
+				_ekf->accel.z = _sensor_combined.accelerometer_m_s2[2];
+
+				if (!_accel_valid) {
+					lastAccel = _ekf->accel;
+				}
+
+				_accel_valid = true;
+			}
+
+			_ekf->dAngIMU = 0.5f * (_ekf->angRate + lastAngRate) * _ekf->dtIMU;
+			lastAngRate = _ekf->angRate;
+			_ekf->dVelIMU = 0.5f * (_ekf->accel + lastAccel) * _ekf->dtIMU;
+			lastAccel = _ekf->accel;
+
+			if (last_mag != _sensor_combined.magnetometer_timestamp) {
+				mag_updated = true;
+				newDataMag = true;
+
+			} else {
+				newDataMag = false;
+			}
+
+			last_mag = _sensor_combined.magnetometer_timestamp;
+
+#endif
+
+			//warnx("dang: %8.4f %8.4f dvel: %8.4f %8.4f", _ekf->dAngIMU.x, _ekf->dAngIMU.z, _ekf->dVelIMU.x, _ekf->dVelIMU.z);
+
+			bool airspeed_updated;
+			orb_check(_airspeed_sub, &airspeed_updated);
+
+			if (airspeed_updated) {
+				orb_copy(ORB_ID(airspeed), _airspeed_sub, &_airspeed);
+				perf_count(_perf_airspeed);
+
+				_ekf->VtasMeas = _airspeed.true_airspeed_m_s;
+				newAdsData = true;
+
+			} else {
+				newAdsData = false;
+			}
+
+			bool gps_updated;
+			orb_check(_gps_sub, &gps_updated);
+
+			if (gps_updated) {
+
+				last_gps = _gps.timestamp_position;
+
+				orb_copy(ORB_ID(vehicle_gps_position), _gps_sub, &_gps);
+				perf_count(_perf_gps);
+
+				if (_gps.fix_type < 3) {
+					newDataGps = false;
+
+				} else {
+
+					/* store time of valid GPS measurement */
+					_gps_start_time = hrt_absolute_time();
+
+					/* check if we had a GPS outage for a long time */
+					if (hrt_elapsed_time(&last_gps) > 5 * 1000 * 1000) {
+						_ekf->ResetPosition();
+						_ekf->ResetVelocity();
+						_ekf->ResetStoredStates();
+					}
+
+					/* fuse GPS updates */
+
+					//_gps.timestamp / 1e3;
+					_ekf->GPSstatus = _gps.fix_type;
+					_ekf->velNED[0] = _gps.vel_n_m_s;
+					_ekf->velNED[1] = _gps.vel_e_m_s;
+					_ekf->velNED[2] = _gps.vel_d_m_s;
+
+					// warnx("GPS updated: status: %d, vel: %8.4f %8.4f %8.4f", (int)GPSstatus, velNED[0], velNED[1], velNED[2]);
+
+					_ekf->gpsLat = math::radians(_gps.lat / (double)1e7);
+					_ekf->gpsLon = math::radians(_gps.lon / (double)1e7) - M_PI;
+					_ekf->gpsHgt = _gps.alt / 1e3f;
+
+					// if (_gps.s_variance_m_s > 0.25f && _gps.s_variance_m_s < 100.0f * 100.0f) {
+					// 	_ekf->vneSigma = sqrtf(_gps.s_variance_m_s);
+					// } else {
+					// 	_ekf->vneSigma = _parameters.velne_noise;
+					// }
+
+					// if (_gps.p_variance_m > 0.25f && _gps.p_variance_m < 100.0f * 100.0f) {
+					// 	_ekf->posNeSigma = sqrtf(_gps.p_variance_m);
+					// } else {
+					// 	_ekf->posNeSigma = _parameters.posne_noise;
+					// }
+
+					// warnx("vel: %8.4f pos: %8.4f", _gps.s_variance_m_s, _gps.p_variance_m);
+
+					newDataGps = true;
+
+				}
+
+			}
+
+			bool baro_updated;
+			orb_check(_baro_sub, &baro_updated);
+
+			if (baro_updated) {
+				orb_copy(ORB_ID(sensor_baro), _baro_sub, &_baro);
+
+				_ekf->baroHgt = _baro.altitude;
+
+				if (!_baro_init) {
+					_baro_ref = _baro.altitude;
+					_baro_init = true;
+					warnx("ALT REF INIT");
+				}
+
+				perf_count(_perf_baro);
+
+				newHgtData = true;
+			} else {
+				newHgtData = false;
+			}
+
+#ifndef SENSOR_COMBINED_SUB
+			orb_check(_mag_sub, &mag_updated);
+#endif
+
+			if (mag_updated) {
+
+				_mag_valid = true;
+
+				perf_count(_perf_mag);
+
+#ifndef SENSOR_COMBINED_SUB
+				orb_copy(ORB_ID(sensor_mag), _mag_sub, &_mag);
+
+				// XXX we compensate the offsets upfront - should be close to zero.
+				// 0.001f
+				_ekf->magData.x = _mag.x;
+				_ekf->magBias.x = 0.000001f; // _mag_offsets.x_offset
+
+				_ekf->magData.y = _mag.y;
+				_ekf->magBias.y = 0.000001f; // _mag_offsets.y_offset
+
+				_ekf->magData.z = _mag.z;
+				_ekf->magBias.z = 0.000001f; // _mag_offsets.y_offset
+
+#else
+
+				// XXX we compensate the offsets upfront - should be close to zero.
+				// 0.001f
+				_ekf->magData.x = _sensor_combined.magnetometer_ga[0];
+				_ekf->magBias.x = 0.000001f; // _mag_offsets.x_offset
+
+				_ekf->magData.y = _sensor_combined.magnetometer_ga[1];
+				_ekf->magBias.y = 0.000001f; // _mag_offsets.y_offset
+
+				_ekf->magData.z = _sensor_combined.magnetometer_ga[2];
+				_ekf->magBias.z = 0.000001f; // _mag_offsets.y_offset
+
+#endif
+
+				newDataMag = true;
+
+			} else {
+				newDataMag = false;
+			}
+
+			/*
+			 *    CHECK IF ITS THE RIGHT TIME TO RUN THINGS ALREADY
+			 */
+			if (hrt_elapsed_time(&_filter_start_time) < FILTER_INIT_DELAY) {
+				continue;
+			}
+
+			/**
+			 *    PART TWO: EXECUTE THE FILTER
+			 *
+			 *    We run the filter only once all data has been fetched
+			 **/
+
+			if (_baro_init && _gyro_valid && _accel_valid && _mag_valid) {
+
+				float initVelNED[3];
+
+				/* Initialize the filter first */
+				if (!_gps_initialized && _gps.fix_type > 2 && _gps.eph < _parameters.pos_stddev_threshold && _gps.epv < _parameters.pos_stddev_threshold) {
+
+					// GPS is in scaled integers, convert
+					double lat = _gps.lat / 1.0e7;
+					double lon = _gps.lon / 1.0e7;
+					float gps_alt = _gps.alt / 1e3f;
+
+					initVelNED[0] = _gps.vel_n_m_s;
+					initVelNED[1] = _gps.vel_e_m_s;
+					initVelNED[2] = _gps.vel_d_m_s;
+
+					// Set up height correctly
+					orb_copy(ORB_ID(sensor_baro), _baro_sub, &_baro);
+					_baro_ref_offset = _ekf->states[9]; // this should become zero in the local frame
+					_baro_gps_offset = _baro.altitude - gps_alt;
+					_ekf->baroHgt = _baro.altitude;
+					_ekf->hgtMea = 1.0f * (_ekf->baroHgt - (_baro_ref));
+
+					// Set up position variables correctly
+					_ekf->GPSstatus = _gps.fix_type;
+
+					_ekf->gpsLat = math::radians(lat);
+					_ekf->gpsLon = math::radians(lon) - M_PI;
+					_ekf->gpsHgt = gps_alt;
+
+					// Look up mag declination based on current position
+					float declination = math::radians(get_mag_declination(lat, lon));
+
+					_ekf->InitialiseFilter(initVelNED, math::radians(lat), math::radians(lon) - M_PI, gps_alt, declination);
+
+					// Initialize projection
+					_local_pos.ref_lat = lat;
+					_local_pos.ref_lon = lon;
+					_local_pos.ref_alt = gps_alt;
+					_local_pos.ref_timestamp = _gps.timestamp_position;
+
+					map_projection_init(&_pos_ref, lat, lon);
+					mavlink_log_info(_mavlink_fd, "[ekf] ref: LA %.4f,LO %.4f,ALT %.2f", lat, lon, (double)gps_alt);
+
+					#if 0
+					warnx("HOME/REF: LA %8.4f,LO %8.4f,ALT %8.2f V: %8.4f %8.4f %8.4f", lat, lon, (double)gps_alt,
+						(double)_ekf->velNED[0], (double)_ekf->velNED[1], (double)_ekf->velNED[2]);
+					warnx("BARO: %8.4f m / ref: %8.4f m / gps offs: %8.4f m", (double)_ekf->baroHgt, (double)_baro_ref, (double)_baro_ref_offset);
+					warnx("GPS: eph: %8.4f, epv: %8.4f, declination: %8.4f", (double)_gps.eph, (double)_gps.epv, (double)math::degrees(declination));
+					#endif
+
+					_gps_initialized = true;
+
+				} else if (!_ekf->statesInitialised) {
+
+					initVelNED[0] = 0.0f;
+					initVelNED[1] = 0.0f;
+					initVelNED[2] = 0.0f;
+					_ekf->posNE[0] = posNED[0];
+					_ekf->posNE[1] = posNED[1];
+
+					_local_pos.ref_alt = _baro_ref;
+					_baro_ref_offset = 0.0f;
+					_baro_gps_offset = 0.0f;
+
+					_ekf->InitialiseFilter(initVelNED, 0.0, 0.0, 0.0f, 0.0f);
+				} else if (_ekf->statesInitialised) {
+
+					// We're apparently initialized in this case now
+
+					int check = check_filter_state();
+
+					if (check) {
+						// Let the system re-initialize itself
+						continue;
+					}
+
+
+					// Run the strapdown INS equations every IMU update
+					_ekf->UpdateStrapdownEquationsNED();
+	#if 0
+					// debug code - could be tunred into a filter mnitoring/watchdog function
+					float tempQuat[4];
+
+					for (uint8_t j = 0; j <= 3; j++) tempQuat[j] = states[j];
+
+					quat2eul(eulerEst, tempQuat);
+
+					for (uint8_t j = 0; j <= 2; j++) eulerDif[j] = eulerEst[j] - ahrsEul[j];
+
+					if (eulerDif[2] > pi) eulerDif[2] -= 2 * pi;
+
+					if (eulerDif[2] < -pi) eulerDif[2] += 2 * pi;
+
+	#endif
+					// store the predicted states for subsequent use by measurement fusion
+					_ekf->StoreStates(IMUmsec);
+					// Check if on ground - status is used by covariance prediction
+					_ekf->OnGroundCheck();
+					// sum delta angles and time used by covariance prediction
+					_ekf->summedDelAng = _ekf->summedDelAng + _ekf->correctedDelAng;
+					_ekf->summedDelVel = _ekf->summedDelVel + _ekf->dVelIMU;
+					dt += _ekf->dtIMU;
+
+					// perform a covariance prediction if the total delta angle has exceeded the limit
+					// or the time limit will be exceeded at the next IMU update
+					if ((dt >= (_ekf->covTimeStepMax - _ekf->dtIMU)) || (_ekf->summedDelAng.length() > _ekf->covDelAngMax)) {
+						_ekf->CovariancePrediction(dt);
+						_ekf->summedDelAng.zero();
+						_ekf->summedDelVel.zero();
+						dt = 0.0f;
+					}
+
+					// Fuse GPS Measurements
+					if (newDataGps && _gps_initialized) {
+						// Convert GPS measurements to Pos NE, hgt and Vel NED
+
+						float gps_dt = (_gps.timestamp_position - last_gps) / 1e6f;
+
+						// Calculate acceleration predicted by GPS velocity change
+						if (((fabsf(_ekf->velNED[0] - _gps.vel_n_m_s) > FLT_EPSILON) ||
+							(fabsf(_ekf->velNED[1] - _gps.vel_e_m_s) > FLT_EPSILON) ||
+							(fabsf(_ekf->velNED[2] - _gps.vel_d_m_s) > FLT_EPSILON)) && (gps_dt > 0.00001f)) {
+
+							_ekf->accelGPSNED[0] = (_ekf->velNED[0] - _gps.vel_n_m_s) / gps_dt;
+							_ekf->accelGPSNED[1] = (_ekf->velNED[1] - _gps.vel_e_m_s) / gps_dt;
+							_ekf->accelGPSNED[2] = (_ekf->velNED[2] - _gps.vel_d_m_s) / gps_dt;
+						}
+
+						_ekf->velNED[0] = _gps.vel_n_m_s;
+						_ekf->velNED[1] = _gps.vel_e_m_s;
+						_ekf->velNED[2] = _gps.vel_d_m_s;
+						_ekf->calcposNED(posNED, _ekf->gpsLat, _ekf->gpsLon, _ekf->gpsHgt, _ekf->latRef, _ekf->lonRef, _ekf->hgtRef);
+
+						_ekf->posNE[0] = posNED[0];
+						_ekf->posNE[1] = posNED[1];
+						// set fusion flags
+						_ekf->fuseVelData = true;
+						_ekf->fusePosData = true;
+						// recall states stored at time of measurement after adjusting for delays
+						_ekf->RecallStates(_ekf->statesAtVelTime, (IMUmsec - _parameters.vel_delay_ms));
+						_ekf->RecallStates(_ekf->statesAtPosTime, (IMUmsec - _parameters.pos_delay_ms));
+						// run the fusion step
+						_ekf->FuseVelposNED();
+
+					} else if (_ekf->statesInitialised) {
+						// Convert GPS measurements to Pos NE, hgt and Vel NED
+						_ekf->velNED[0] = 0.0f;
+						_ekf->velNED[1] = 0.0f;
+						_ekf->velNED[2] = 0.0f;
+
+						_ekf->posNE[0] = 0.0f;
+						_ekf->posNE[1] = 0.0f;
+						// set fusion flags
+						_ekf->fuseVelData = true;
+						_ekf->fusePosData = true;
+						// recall states stored at time of measurement after adjusting for delays
+						_ekf->RecallStates(_ekf->statesAtVelTime, (IMUmsec - _parameters.vel_delay_ms));
+						_ekf->RecallStates(_ekf->statesAtPosTime, (IMUmsec - _parameters.pos_delay_ms));
+						// run the fusion step
+						_ekf->FuseVelposNED();
+
+					} else {
+						_ekf->fuseVelData = false;
+						_ekf->fusePosData = false;
+					}
+
+					if (newHgtData && _ekf->statesInitialised) {
+						// Could use a blend of GPS and baro alt data if desired
+						_ekf->hgtMea = 1.0f * (_ekf->baroHgt - _baro_ref);
+						_ekf->fuseHgtData = true;
+						// recall states stored at time of measurement after adjusting for delays
+						_ekf->RecallStates(_ekf->statesAtHgtTime, (IMUmsec - _parameters.height_delay_ms));
+						// run the fusion step
+						_ekf->FuseVelposNED();
+
+					} else {
+						_ekf->fuseHgtData = false;
+					}
+
+					// Fuse Magnetometer Measurements
+					if (newDataMag && _ekf->statesInitialised) {
+						_ekf->fuseMagData = true;
+						_ekf->RecallStates(_ekf->statesAtMagMeasTime, (IMUmsec - _parameters.mag_delay_ms)); // Assume 50 msec avg delay for magnetometer data
+
+						_ekf->magstate.obsIndex = 0;
+						_ekf->FuseMagnetometer();
+						_ekf->FuseMagnetometer();
+						_ekf->FuseMagnetometer();
+
+					} else {
+						_ekf->fuseMagData = false;
+					}
+
+					// Fuse Airspeed Measurements
+					if (newAdsData && _ekf->statesInitialised && _ekf->VtasMeas > 8.0f) {
+						_ekf->fuseVtasData = true;
+						_ekf->RecallStates(_ekf->statesAtVtasMeasTime, (IMUmsec - _parameters.tas_delay_ms)); // assume 100 msec avg delay for airspeed data
+						_ekf->FuseAirspeed();
+
+					} else {
+						_ekf->fuseVtasData = false;
+					}
+
+
+					// Output results
+					math::Quaternion q(_ekf->states[0], _ekf->states[1], _ekf->states[2], _ekf->states[3]);
+					math::Matrix<3, 3> R = q.to_dcm();
+					math::Vector<3> euler = R.to_euler();
+
+					for (int i = 0; i < 3; i++) for (int j = 0; j < 3; j++)
+							_att.R[i][j] = R(i, j);
+
+					_att.timestamp = _last_sensor_timestamp;
+					_att.q[0] = _ekf->states[0];
+					_att.q[1] = _ekf->states[1];
+					_att.q[2] = _ekf->states[2];
+					_att.q[3] = _ekf->states[3];
+					_att.q_valid = true;
+					_att.R_valid = true;
+
+					_att.timestamp = _last_sensor_timestamp;
+					_att.roll = euler(0);
+					_att.pitch = euler(1);
+					_att.yaw = euler(2);
+
+					_att.rollspeed = _ekf->angRate.x - _ekf->states[10];
+					_att.pitchspeed = _ekf->angRate.y - _ekf->states[11];
+					_att.yawspeed = _ekf->angRate.z - _ekf->states[12];
+					// gyro offsets
+					_att.rate_offsets[0] = _ekf->states[10];
+					_att.rate_offsets[1] = _ekf->states[11];
+					_att.rate_offsets[2] = _ekf->states[12];
+
+					/* lazily publish the attitude only once available */
+					if (_att_pub > 0) {
+						/* publish the attitude setpoint */
+						orb_publish(ORB_ID(vehicle_attitude), _att_pub, &_att);
+
+					} else {
+						/* advertise and publish */
+						_att_pub = orb_advertise(ORB_ID(vehicle_attitude), &_att);
+					}
+
+					if (_gps_initialized) {
+						_local_pos.timestamp = _last_sensor_timestamp;
+						_local_pos.x = _ekf->states[7];
+						_local_pos.y = _ekf->states[8];
+						// XXX need to announce change of Z reference somehow elegantly
+						_local_pos.z = _ekf->states[9] - _baro_ref_offset;
+
+						_local_pos.vx = _ekf->states[4];
+						_local_pos.vy = _ekf->states[5];
+						_local_pos.vz = _ekf->states[6];
+
+						_local_pos.xy_valid = _gps_initialized;
+						_local_pos.z_valid = true;
+						_local_pos.v_xy_valid = _gps_initialized;
+						_local_pos.v_z_valid = true;
+						_local_pos.xy_global = true;
+
+						_velocity_xy_filtered = 0.95f*_velocity_xy_filtered + 0.05f*sqrtf(_local_pos.vx*_local_pos.vx + _local_pos.vy*_local_pos.vy);
+						_velocity_z_filtered = 0.95f*_velocity_z_filtered + 0.05f*fabsf(_local_pos.vz);
+						_airspeed_filtered = 0.95f*_airspeed_filtered + + 0.05f*_airspeed.true_airspeed_m_s;
+
+
+						/* crude land detector for fixedwing only,
+						* TODO: adapt so that it works for both, maybe move to another location
+						*/
+						if (_velocity_xy_filtered < 5
+							&& _velocity_z_filtered < 10
+							&& _airspeed_filtered < 10) {
+							_local_pos.landed = true;
+						} else {
+							_local_pos.landed = false;
+						}
+
+						_local_pos.z_global = false;
+						_local_pos.yaw = _att.yaw;
+
+						/* lazily publish the local position only once available */
+						if (_local_pos_pub > 0) {
+							/* publish the attitude setpoint */
+							orb_publish(ORB_ID(vehicle_local_position), _local_pos_pub, &_local_pos);
+
+						} else {
+							/* advertise and publish */
+							_local_pos_pub = orb_advertise(ORB_ID(vehicle_local_position), &_local_pos);
+						}
+
+						_global_pos.timestamp = _local_pos.timestamp;
+
+						if (_local_pos.xy_global) {
+							double est_lat, est_lon;
+							map_projection_reproject(&_pos_ref, _local_pos.x, _local_pos.y, &est_lat, &est_lon);
+							_global_pos.lat = est_lat;
+							_global_pos.lon = est_lon;
+							_global_pos.time_gps_usec = _gps.time_gps_usec;
+							_global_pos.eph = _gps.eph;
+							_global_pos.epv = _gps.epv;
+						}
+
+						if (_local_pos.v_xy_valid) {
+							_global_pos.vel_n = _local_pos.vx;
+							_global_pos.vel_e = _local_pos.vy;
+						} else {
+							_global_pos.vel_n = 0.0f;
+							_global_pos.vel_e = 0.0f;
+						}
+
+						/* local pos alt is negative, change sign and add alt offsets */
+						_global_pos.alt = _baro_ref + (-_local_pos.z) - _baro_gps_offset;
+
+						if (_local_pos.v_z_valid) {
+							_global_pos.vel_d = _local_pos.vz;
+						}
+
+
+						_global_pos.yaw = _local_pos.yaw;
+
+						_global_pos.eph = _gps.eph;
+						_global_pos.epv = _gps.epv;
+
+						_global_pos.timestamp = _local_pos.timestamp;
+
+						/* lazily publish the global position only once available */
+						if (_global_pos_pub > 0) {
+							/* publish the global position */
+							orb_publish(ORB_ID(vehicle_global_position), _global_pos_pub, &_global_pos);
+
+						} else {
+							/* advertise and publish */
+							_global_pos_pub = orb_advertise(ORB_ID(vehicle_global_position), &_global_pos);
+						}
+
+						if (hrt_elapsed_time(&_wind.timestamp) > 99000) {
+							_wind.timestamp = _global_pos.timestamp;
+							_wind.windspeed_north = _ekf->states[14];
+							_wind.windspeed_east = _ekf->states[15];
+							_wind.covariance_north = 0.0f; // XXX get form filter
+							_wind.covariance_east = 0.0f;
+
+							/* lazily publish the wind estimate only once available */
+							if (_wind_pub > 0) {
+								/* publish the wind estimate */
+								orb_publish(ORB_ID(wind_estimate), _wind_pub, &_wind);
+
+							} else {
+								/* advertise and publish */
+								_wind_pub = orb_advertise(ORB_ID(wind_estimate), &_wind);
+							}
+
+						}
+
+					}
+
+				}
+
+				if (hrt_elapsed_time(&_wind.timestamp) > 99000) {
+					_wind.timestamp = _global_pos.timestamp;
+					_wind.windspeed_north = _ekf->states[14];
+					_wind.windspeed_east = _ekf->states[15];
+					_wind.covariance_north = _ekf->P[14][14];
+					_wind.covariance_east = _ekf->P[15][15];
+
+					/* lazily publish the wind estimate only once available */
+					if (_wind_pub > 0) {
+						/* publish the wind estimate */
+						orb_publish(ORB_ID(wind_estimate), _wind_pub, &_wind);
+
+					} else {
+						/* advertise and publish */
+						_wind_pub = orb_advertise(ORB_ID(wind_estimate), &_wind);
+					}
+				}
+			}
+
+		}
+
+		perf_end(_loop_perf);
+	}
+
+	warnx("exiting.\n");
+
+	_estimator_task = -1;
+	_exit(0);
+}
+
+int
+FixedwingEstimator::start()
+{
+	ASSERT(_estimator_task == -1);
+
+	/* start the task */
+	_estimator_task = task_spawn_cmd("ekf_att_pos_estimator",
+					 SCHED_DEFAULT,
+					 SCHED_PRIORITY_MAX - 40,
+					 6000,
+					 (main_t)&FixedwingEstimator::task_main_trampoline,
+					 nullptr);
+
+	if (_estimator_task < 0) {
+		warn("task start failed");
+		return -errno;
+	}
+
+	return OK;
+}
+
+void
+FixedwingEstimator::print_status()
+{
+	math::Quaternion q(_ekf->states[0], _ekf->states[1], _ekf->states[2], _ekf->states[3]);
+	math::Matrix<3, 3> R = q.to_dcm();
+	math::Vector<3> euler = R.to_euler();
+
+	printf("attitude: roll: %8.4f, pitch %8.4f, yaw: %8.4f degrees\n",
+	       (double)math::degrees(euler(0)), (double)math::degrees(euler(1)), (double)math::degrees(euler(2)));
+
+	// State vector:
+	// 0-3: quaternions (q0, q1, q2, q3)
+	// 4-6: Velocity - m/sec (North, East, Down)
+	// 7-9: Position - m (North, East, Down)
+	// 10-12: Delta Angle bias - rad (X,Y,Z)
+	// 13:    Accelerometer offset
+	// 14-15: Wind Vector  - m/sec (North,East)
+	// 16-18: Earth Magnetic Field Vector - gauss (North, East, Down)
+	// 19-21: Body Magnetic Field Vector - gauss (X,Y,Z)
+
+	printf("dtIMU: %8.6f IMUmsec: %d\n", (double)_ekf->dtIMU, (int)IMUmsec);
+	printf("baro alt: %8.4f GPS alt: %8.4f\n", (double)_baro.altitude, (double)(_gps.alt / 1e3f));
+	printf("ref alt: %8.4f baro ref offset: %8.4f baro GPS offset: %8.4f\n", (double)_baro_ref, (double)_baro_ref_offset, (double)_baro_gps_offset);
+	printf("dvel: %8.6f %8.6f %8.6f accel: %8.6f %8.6f %8.6f\n", (double)_ekf->dVelIMU.x, (double)_ekf->dVelIMU.y, (double)_ekf->dVelIMU.z, (double)_ekf->accel.x, (double)_ekf->accel.y, (double)_ekf->accel.z);
+	printf("dang: %8.4f %8.4f %8.4f dang corr: %8.4f %8.4f %8.4f\n" , (double)_ekf->dAngIMU.x, (double)_ekf->dAngIMU.y, (double)_ekf->dAngIMU.z, (double)_ekf->correctedDelAng.x, (double)_ekf->correctedDelAng.y, (double)_ekf->correctedDelAng.z);
+	printf("states (quat)        [0-3]: %8.4f, %8.4f, %8.4f, %8.4f\n", (double)_ekf->states[0], (double)_ekf->states[1], (double)_ekf->states[2], (double)_ekf->states[3]);
+	printf("states (vel m/s)     [4-6]: %8.4f, %8.4f, %8.4f\n", (double)_ekf->states[4], (double)_ekf->states[5], (double)_ekf->states[6]);
+	printf("states (pos m)      [7-9]: %8.4f, %8.4f, %8.4f\n", (double)_ekf->states[7], (double)_ekf->states[8], (double)_ekf->states[9]);
+	printf("states (delta ang) [10-12]: %8.4f, %8.4f, %8.4f\n", (double)_ekf->states[10], (double)_ekf->states[11], (double)_ekf->states[12]);
+
+	if (n_states == 23) {
+		printf("states (accel offs)   [13]: %8.4f\n", (double)_ekf->states[13]);
+		printf("states (wind)      [14-15]: %8.4f, %8.4f\n", (double)_ekf->states[14], (double)_ekf->states[15]);
+		printf("states (earth mag) [16-18]: %8.4f, %8.4f, %8.4f\n", (double)_ekf->states[16], (double)_ekf->states[17], (double)_ekf->states[18]);
+		printf("states (body mag)  [19-21]: %8.4f, %8.4f, %8.4f\n", (double)_ekf->states[19], (double)_ekf->states[20], (double)_ekf->states[21]);
+		printf("states (terrain)      [22]: %8.4f\n", (double)_ekf->states[22]);
+
+	} else {
+		printf("states (wind)      [13-14]: %8.4f, %8.4f\n", (double)_ekf->states[13], (double)_ekf->states[14]);
+		printf("states (earth mag) [15-17]: %8.4f, %8.4f, %8.4f\n", (double)_ekf->states[15], (double)_ekf->states[16], (double)_ekf->states[17]);
+		printf("states (body mag)  [18-20]: %8.4f, %8.4f, %8.4f\n", (double)_ekf->states[18], (double)_ekf->states[19], (double)_ekf->states[20]);
+	}
+	printf("states: %s %s %s %s %s %s %s %s %s %s\n",
+		       (_ekf->statesInitialised) ? "INITIALIZED" : "NON_INIT",
+		       (_ekf->onGround) ? "ON_GROUND" : "AIRBORNE",
+		       (_ekf->fuseVelData) ? "FUSE_VEL" : "INH_VEL",
+		       (_ekf->fusePosData) ? "FUSE_POS" : "INH_POS",
+		       (_ekf->fuseHgtData) ? "FUSE_HGT" : "INH_HGT",
+		       (_ekf->fuseMagData) ? "FUSE_MAG" : "INH_MAG",
+		       (_ekf->fuseVtasData) ? "FUSE_VTAS" : "INH_VTAS",
+		       (_ekf->useAirspeed) ? "USE_AIRSPD" : "IGN_AIRSPD",
+		       (_ekf->useCompass) ? "USE_COMPASS" : "IGN_COMPASS",
+		       (_ekf->staticMode) ? "STATIC_MODE" : "DYNAMIC_MODE");
+}
+
+int FixedwingEstimator::trip_nan() {
+
+	int ret = 0;
+
+	// If system is not armed, inject a NaN value into the filter
+	int armed_sub = orb_subscribe(ORB_ID(actuator_armed));
+
+	struct actuator_armed_s armed;
+	orb_copy(ORB_ID(actuator_armed), armed_sub, &armed);
+
+	if (armed.armed) {
+		warnx("ACTUATORS ARMED! NOT TRIPPING SYSTEM");
+		ret = 1;
+	} else {
+
+		float nan_val = 0.0f / 0.0f;
+
+		warnx("system not armed, tripping state vector with NaN values");
+		_ekf->states[5] = nan_val;
+		usleep(100000);
+
+		warnx("tripping covariance #1 with NaN values");
+		_ekf->KH[2][2] = nan_val; //  intermediate result used for covariance updates
+		usleep(100000);
+
+		warnx("tripping covariance #2 with NaN values");
+		_ekf->KHP[5][5] = nan_val; // intermediate result used for covariance updates
+		usleep(100000);
+
+		warnx("tripping covariance #3 with NaN values");
+		_ekf->P[3][3] = nan_val; // covariance matrix
+		usleep(100000);
+
+		warnx("tripping Kalman gains with NaN values");
+		_ekf->Kfusion[0] = nan_val; // Kalman gains
+		usleep(100000);
+
+		warnx("tripping stored states[0] with NaN values");
+		_ekf->storedStates[0][0] = nan_val;
+		usleep(100000);
+
+		warnx("\nDONE - FILTER STATE:");
+		print_status();
+	}
+
+	close(armed_sub);
+	return ret;
+}
+
+int ekf_att_pos_estimator_main(int argc, char *argv[])
+{
+	if (argc < 1)
+		errx(1, "usage: ekf_att_pos_estimator {start|stop|status|logging}");
+
+	if (!strcmp(argv[1], "start")) {
+
+		if (estimator::g_estimator != nullptr)
+			errx(1, "already running");
+
+		estimator::g_estimator = new FixedwingEstimator;
+
+		if (estimator::g_estimator == nullptr)
+			errx(1, "alloc failed");
+
+		if (OK != estimator::g_estimator->start()) {
+			delete estimator::g_estimator;
+			estimator::g_estimator = nullptr;
+			err(1, "start failed");
+		}
+
+		exit(0);
+	}
+
+	if (!strcmp(argv[1], "stop")) {
+		if (estimator::g_estimator == nullptr)
+			errx(1, "not running");
+
+		delete estimator::g_estimator;
+		estimator::g_estimator = nullptr;
+		exit(0);
+	}
+
+	if (!strcmp(argv[1], "status")) {
+		if (estimator::g_estimator) {
+			warnx("running");
+
+			estimator::g_estimator->print_status();
+
+			exit(0);
+
+		} else {
+			errx(1, "not running");
+		}
+	}
+
+	if (!strcmp(argv[1], "trip")) {
+		if (estimator::g_estimator) {
+			int ret = estimator::g_estimator->trip_nan();
+
+			exit(ret);
+
+		} else {
+			errx(1, "not running");
+		}
+	}
+
+	if (!strcmp(argv[1], "logging")) {
+		if (estimator::g_estimator) {
+			int ret = estimator::g_estimator->enable_logging(true);
+
+			exit(ret);
+
+		} else {
+			errx(1, "not running");
+		}
+	}
+
+	if (!strcmp(argv[1], "debug")) {
+		if (estimator::g_estimator) {
+			int debug = strtoul(argv[2], NULL, 10);
+			int ret = estimator::g_estimator->set_debuglevel(debug);
+
+			exit(ret);
+
+		} else {
+			errx(1, "not running");
+		}
+	}
+
+	warnx("unrecognized command");
+	return 1;
+}
diff --git a/src/modules/ekf_att_pos_estimator/ekf_att_pos_estimator_params.c b/src/modules/ekf_att_pos_estimator/ekf_att_pos_estimator_params.c
new file mode 100644
index 000000000..8c82dd6c1
--- /dev/null
+++ b/src/modules/ekf_att_pos_estimator/ekf_att_pos_estimator_params.c
@@ -0,0 +1,271 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file ekf_att_pos_estimator_params.c
+ *
+ * Parameters defined by the attitude and position estimator task
+ *
+ * @author Lorenz Meier <lm@inf.ethz.ch>
+ */
+
+#include <nuttx/config.h>
+
+#include <systemlib/param/param.h>
+
+/*
+ * Estimator parameters, accessible via MAVLink
+ *
+ */
+
+/**
+ * Velocity estimate delay
+ *
+ * The delay in milliseconds of the velocity estimate from GPS.
+ *
+ * @min 0
+ * @max 1000
+ * @group Position Estimator
+ */
+PARAM_DEFINE_INT32(PE_VEL_DELAY_MS, 230);
+
+/**
+ * Position estimate delay
+ *
+ * The delay in milliseconds of the position estimate from GPS.
+ *
+ * @min 0
+ * @max 1000
+ * @group Position Estimator
+ */
+PARAM_DEFINE_INT32(PE_POS_DELAY_MS, 210);
+
+/**
+ * Height estimate delay
+ *
+ * The delay in milliseconds of the height estimate from the barometer.
+ *
+ * @min 0
+ * @max 1000
+ * @group Position Estimator
+ */
+PARAM_DEFINE_INT32(PE_HGT_DELAY_MS, 350);
+
+/**
+ * Mag estimate delay
+ *
+ * The delay in milliseconds of the magnetic field estimate from
+ * the magnetometer.
+ *
+ * @min 0
+ * @max 1000
+ * @group Position Estimator
+ */
+PARAM_DEFINE_INT32(PE_MAG_DELAY_MS, 30);
+
+/**
+ * True airspeeed estimate delay
+ *
+ * The delay in milliseconds of the airspeed estimate.
+ *
+ * @min 0
+ * @max 1000
+ * @group Position Estimator
+ */
+PARAM_DEFINE_INT32(PE_TAS_DELAY_MS, 210);
+
+/**
+ * GPS vs. barometric altitude update weight
+ *
+ * RE-CHECK this.
+ *
+ * @min 0.0
+ * @max 1.0
+ * @group Position Estimator
+ */
+PARAM_DEFINE_FLOAT(PE_GPS_ALT_WGT, 0.9f);
+
+/**
+ * Airspeed measurement noise.
+ *
+ * Increasing this value will make the filter trust this sensor
+ * less and trust other sensors more.
+ *
+ * @min 0.5
+ * @max 5.0
+ * @group Position Estimator
+ */
+PARAM_DEFINE_FLOAT(PE_EAS_NOISE, 1.4f);
+
+/**
+ * Velocity measurement noise in north-east (horizontal) direction.
+ *
+ * Generic default: 0.3, multicopters: 0.5, ground vehicles: 0.5
+ *
+ * @min 0.05
+ * @max 5.0
+ * @group Position Estimator
+ */
+PARAM_DEFINE_FLOAT(PE_VELNE_NOISE, 0.3f);
+
+/**
+ * Velocity noise in down (vertical) direction
+ *
+ * Generic default: 0.5, multicopters: 0.7, ground vehicles: 0.7
+ *
+ * @min 0.05
+ * @max 5.0
+ * @group Position Estimator
+ */
+PARAM_DEFINE_FLOAT(PE_VELD_NOISE, 0.5f);
+
+/**
+ * Position noise in north-east (horizontal) direction
+ *
+ * Generic defaults: 0.5, multicopters: 0.5, ground vehicles: 0.5
+ *
+ * @min 0.1
+ * @max 10.0
+ * @group Position Estimator
+ */
+PARAM_DEFINE_FLOAT(PE_POSNE_NOISE, 0.5f);
+
+/**
+ * Position noise in down (vertical) direction
+ *
+ * Generic defaults: 0.5, multicopters: 1.0, ground vehicles: 1.0
+ *
+ * @min 0.1
+ * @max 10.0
+ * @group Position Estimator
+ */
+PARAM_DEFINE_FLOAT(PE_POSD_NOISE, 0.5f);
+
+/**
+ * Magnetometer measurement noise
+ *
+ * Generic defaults: 0.05, multicopters: 0.05, ground vehicles: 0.05
+ *
+ * @min 0.1
+ * @max 10.0
+ * @group Position Estimator
+ */
+PARAM_DEFINE_FLOAT(PE_MAG_NOISE, 0.05f);
+
+/**
+ * Gyro process noise
+ *
+ * Generic defaults: 0.015, multicopters: 0.015, ground vehicles: 0.015.
+ * This noise controls how much the filter trusts the gyro measurements.
+ * Increasing it makes the filter trust the gyro less and other sensors more.
+ *
+ * @min 0.001
+ * @max 0.05
+ * @group Position Estimator
+ */
+PARAM_DEFINE_FLOAT(PE_GYRO_PNOISE, 0.015f);
+
+/**
+ * Accelerometer process noise
+ *
+ * Generic defaults: 0.25, multicopters: 0.25, ground vehicles: 0.25.
+ * Increasing this value makes the filter trust the accelerometer less
+ * and other sensors more.
+ *
+ * @min 0.05
+ * @max 1.0
+ * @group Position Estimator
+ */
+PARAM_DEFINE_FLOAT(PE_ACC_PNOISE, 0.25f);
+
+/**
+ * Gyro bias estimate process noise
+ *
+ * Generic defaults: 1e-07f, multicopters: 1e-07f, ground vehicles: 1e-07f.
+ * Increasing this value will make the gyro bias converge faster but noisier.
+ *
+ * @min 0.0000001
+ * @max 0.00001
+ * @group Position Estimator
+ */
+PARAM_DEFINE_FLOAT(PE_GBIAS_PNOISE, 1e-07f);
+
+/**
+ * Accelerometer bias estimate process noise
+ *
+ * Generic defaults: 0.0001f, multicopters: 0.0001f, ground vehicles: 0.0001f.
+ * Increasing this value makes the bias estimation faster and noisier.
+ *
+ * @min 0.00001
+ * @max 0.001
+ * @group Position Estimator
+ */
+PARAM_DEFINE_FLOAT(PE_ABIAS_PNOISE, 0.00005f);
+
+/**
+ * Magnetometer earth frame offsets process noise
+ *
+ * Generic defaults: 0.0001, multicopters: 0.0001, ground vehicles: 0.0001.
+ * Increasing this value makes the magnetometer earth bias estimate converge
+ * faster but also noisier.
+ *
+ * @min 0.0001
+ * @max 0.01
+ * @group Position Estimator
+ */
+PARAM_DEFINE_FLOAT(PE_MAGE_PNOISE, 0.0003f);
+
+/**
+ * Magnetometer body frame offsets process noise
+ *
+ * Generic defaults: 0.0003, multicopters: 0.0003, ground vehicles: 0.0003.
+ * Increasing this value makes the magnetometer body bias estimate converge faster
+ * but also noisier.
+ *
+ * @min 0.0001
+ * @max 0.01
+ * @group Position Estimator
+ */
+PARAM_DEFINE_FLOAT(PE_MAGB_PNOISE, 0.0003f);
+
+/**
+ * Threshold for filter initialization.
+ *
+ * If the standard deviation of the GPS position estimate is below this threshold
+ * in meters, the filter will initialize.
+ *
+ * @min 0.3
+ * @max 10.0
+ * @group Position Estimator
+ */
+PARAM_DEFINE_FLOAT(PE_POSDEV_INIT, 5.0f);
diff --git a/src/modules/fw_att_pos_estimator/estimator.cpp b/src/modules/ekf_att_pos_estimator/estimator_21states.cpp
index 46e405526..67bfec4ea 100644
--- a/src/modules/fw_att_pos_estimator/estimator.cpp
+++ b/src/modules/ekf_att_pos_estimator/estimator_21states.cpp
@@ -1,191 +1,33 @@
-#include "estimator.h"
+#include "estimator_21states.h"
 
 #include <string.h>
 
-// Global variables
-float KH[n_states][n_states]; //  intermediate result used for covariance updates
-float KHP[n_states][n_states]; // intermediate result used for covariance updates
-float P[n_states][n_states]; // covariance matrix
-float Kfusion[n_states]; // Kalman gains
-float states[n_states]; // state matrix
-Vector3f correctedDelAng; // delta angles about the xyz body axes corrected for errors (rad)
-Vector3f correctedDelVel; // delta velocities along the XYZ body axes corrected for errors (m/s)
-Vector3f summedDelAng; // summed delta angles about the xyz body axes corrected for errors (rad)
-Vector3f summedDelVel; // summed delta velocities along the XYZ body axes corrected for errors (m/s)
-float accNavMag; // magnitude of navigation accel (- used to adjust GPS obs variance (m/s^2)
-Vector3f earthRateNED; // earths angular rate vector in NED (rad/s)
-Vector3f angRate; // angular rate vector in XYZ body axes measured by the IMU (rad/s)
-Vector3f accel; // acceleration vector in XYZ body axes measured by the IMU (m/s^2)
-Vector3f dVelIMU;
-Vector3f dAngIMU;
-float dtIMU; // time lapsed since the last IMU measurement or covariance update (sec)
-uint8_t fusionModeGPS = 0; // 0 = GPS outputs 3D velocity, 1 = GPS outputs 2D velocity, 2 = GPS outputs no velocity
-float innovVelPos[6]; // innovation output
-float varInnovVelPos[6]; // innovation variance output
-
-float velNED[3]; // North, East, Down velocity obs (m/s)
-float posNE[2]; // North, East position obs (m)
-float hgtMea; //  measured height (m)
-float posNED[3]; // North, East Down position (m)
-
-float statesAtVelTime[n_states]; // States at the effective measurement time for posNE and velNED measurements
-float statesAtPosTime[n_states]; // States at the effective measurement time for posNE and velNED measurements
-float statesAtHgtTime[n_states]; // States at the effective measurement time for the hgtMea measurement
-float statesAtMagMeasTime[n_states]; // filter satates at the effective measurement time
-float statesAtVtasMeasTime[n_states]; // filter states at the effective measurement time
-
-float innovMag[3]; // innovation output
-float varInnovMag[3]; // innovation variance output
-Vector3f magData; // magnetometer flux radings in X,Y,Z body axes
-float innovVtas; // innovation output
-float varInnovVtas; // innovation variance output
-float VtasMeas; // true airspeed measurement (m/s)
-float latRef; // WGS-84 latitude of reference point (rad)
-float lonRef; // WGS-84 longitude of reference point (rad)
-float hgtRef; // WGS-84 height of reference point (m)
-Vector3f magBias; // states representing magnetometer bias vector in XYZ body axes
-uint8_t covSkipCount = 0; // Number of state prediction frames (IMU daya updates to skip before doing the covariance prediction
-float EAS2TAS = 1.0f; // ratio f true to equivalent airspeed
-
-// GPS input data variables
-float gpsCourse;
-float gpsVelD;
-float gpsLat;
-float gpsLon;
-float gpsHgt;
-uint8_t GPSstatus;
-
-float storedStates[n_states][data_buffer_size]; // state vectors stored for the last 50 time steps
-uint32_t statetimeStamp[data_buffer_size]; // time stamp for each state vector stored
-
-// Baro input
-float baroHgt;
-
-bool statesInitialised = false;
-
-bool fuseVelData = false; // this boolean causes the posNE and velNED obs to be fused
-bool fusePosData = false; // this boolean causes the posNE and velNED obs to be fused
-bool fuseHgtData = false; // this boolean causes the hgtMea obs to be fused
-bool fuseMagData = false; // boolean true when magnetometer data is to be fused
-bool fuseVtasData = false; // boolean true when airspeed data is to be fused
-
-bool onGround    = true;    ///< boolean true when the flight vehicle is on the ground (not flying)
-bool staticMode  = true;    ///< boolean true if no position feedback is fused
-bool useAirspeed = true;    ///< boolean true if airspeed data is being used
-bool useCompass  = true;    ///< boolean true if magnetometer data is being used
-
-struct ekf_status_report current_ekf_state;
-struct ekf_status_report last_ekf_error;
-
-bool numericalProtection = true;
-
-static unsigned storeIndex = 0;
-
-float Vector3f::length(void) const
+AttPosEKF::AttPosEKF() :
+    fusionModeGPS(0),
+    covSkipCount(0),
+    EAS2TAS(1.0f),
+    statesInitialised(false),
+    fuseVelData(false),
+    fusePosData(false),
+    fuseHgtData(false),
+    fuseMagData(false),
+    fuseVtasData(false),
+    onGround(true),
+    staticMode(true),
+    useAirspeed(true),
+    useCompass(true),
+    numericalProtection(true),
+    storeIndex(0),
+    magDeclination(0.0f)
 {
-    return sqrt(x*x + y*y + z*z);
+    InitialiseParameters();
 }
 
-Vector3f Vector3f::zero(void) const
+AttPosEKF::~AttPosEKF()
 {
-    Vector3f ret = *this;
-    ret.x = 0.0;
-    ret.y = 0.0;
-    ret.z = 0.0;
-    return ret;
-}
-
-Mat3f::Mat3f() {
-    x.x = 1.0f;
-    x.y = 0.0f;
-    x.z = 0.0f;
-
-    y.x = 0.0f;
-    y.y = 1.0f;
-    y.z = 0.0f;
-
-    z.x = 0.0f;
-    z.y = 0.0f;
-    z.z = 1.0f;
-}
-
-Mat3f Mat3f::transpose(void) const
-{
-    Mat3f ret = *this;
-    swap_var(ret.x.y, ret.y.x);
-    swap_var(ret.x.z, ret.z.x);
-    swap_var(ret.y.z, ret.z.y);
-    return ret;
-}
-
-// overload + operator to provide a vector addition
-Vector3f operator+( Vector3f vecIn1, Vector3f vecIn2)
-{
-    Vector3f vecOut;
-    vecOut.x = vecIn1.x + vecIn2.x;
-    vecOut.y = vecIn1.y + vecIn2.y;
-    vecOut.z = vecIn1.z + vecIn2.z;
-    return vecOut;
-}
-
-// overload - operator to provide a vector subtraction
-Vector3f operator-( Vector3f vecIn1, Vector3f vecIn2)
-{
-    Vector3f vecOut;
-    vecOut.x = vecIn1.x - vecIn2.x;
-    vecOut.y = vecIn1.y - vecIn2.y;
-    vecOut.z = vecIn1.z - vecIn2.z;
-    return vecOut;
-}
-
-// overload * operator to provide a matrix vector product
-Vector3f operator*( Mat3f matIn, Vector3f vecIn)
-{
-    Vector3f vecOut;
-    vecOut.x = matIn.x.x*vecIn.x + matIn.x.y*vecIn.y + matIn.x.z*vecIn.z;
-    vecOut.y = matIn.y.x*vecIn.x + matIn.y.y*vecIn.y + matIn.y.z*vecIn.z;
-    vecOut.z = matIn.x.x*vecIn.x + matIn.z.y*vecIn.y + matIn.z.z*vecIn.z;
-    return vecOut;
-}
-
-// overload % operator to provide a vector cross product
-Vector3f operator%( Vector3f vecIn1, Vector3f vecIn2)
-{
-    Vector3f vecOut;
-    vecOut.x = vecIn1.y*vecIn2.z - vecIn1.z*vecIn2.y;
-    vecOut.y = vecIn1.z*vecIn2.x - vecIn1.x*vecIn2.z;
-    vecOut.z = vecIn1.x*vecIn2.y - vecIn1.y*vecIn2.x;
-    return vecOut;
-}
-
-// overload * operator to provide a vector scaler product
-Vector3f operator*(Vector3f vecIn1, float sclIn1)
-{
-    Vector3f vecOut;
-    vecOut.x = vecIn1.x * sclIn1;
-    vecOut.y = vecIn1.y * sclIn1;
-    vecOut.z = vecIn1.z * sclIn1;
-    return vecOut;
 }
 
-// overload * operator to provide a vector scaler product
-Vector3f operator*(float sclIn1, Vector3f vecIn1)
-{
-    Vector3f vecOut;
-    vecOut.x = vecIn1.x * sclIn1;
-    vecOut.y = vecIn1.y * sclIn1;
-    vecOut.z = vecIn1.z * sclIn1;
-    return vecOut;
-}
-
-void swap_var(float &d1, float &d2)
-{
-    float tmp = d1;
-    d1 = d2;
-    d2 = tmp;
-}
-
-void  UpdateStrapdownEquationsNED()
+void AttPosEKF::UpdateStrapdownEquationsNED()
 {
     Vector3f delVelNav;
     float q00;
@@ -203,7 +45,7 @@ void  UpdateStrapdownEquationsNED()
     float rotationMag;
     float qUpdated[4];
     float quatMag;
-    float deltaQuat[4];
+    double deltaQuat[4];
     const Vector3f gravityNED = {0.0,0.0,GRAVITY_MSS};
 
 // Remove sensor bias errors
@@ -220,7 +62,6 @@ void  UpdateStrapdownEquationsNED()
 // Apply corrections for earths rotation rate and coning errors
 // * and + operators have been overloaded
     correctedDelAng   = correctedDelAng - Tnb*earthRateNED*dtIMU + 8.333333333333333e-2f*(prevDelAng % correctedDelAng);
-
 // Convert the rotation vector to its equivalent quaternion
     rotationMag = correctedDelAng.length();
     if (rotationMag < 1e-12f)
@@ -233,7 +74,7 @@ void  UpdateStrapdownEquationsNED()
     else
     {
         deltaQuat[0] = cos(0.5f*rotationMag);
-        float rotScaler = (sin(0.5f*rotationMag))/rotationMag;
+        double rotScaler = (sin(0.5f*rotationMag))/rotationMag;
         deltaQuat[1] = correctedDelAng.x*rotScaler;
         deltaQuat[2] = correctedDelAng.y*rotScaler;
         deltaQuat[3] = correctedDelAng.z*rotScaler;
@@ -247,7 +88,7 @@ void  UpdateStrapdownEquationsNED()
     qUpdated[3] = states[0]*deltaQuat[3] + states[3]*deltaQuat[0] + states[1]*deltaQuat[2] - states[2]*deltaQuat[1];
 
 // Normalise the quaternions and update the quaternion states
-    quatMag = sqrt(sq(qUpdated[0]) + sq(qUpdated[1]) + sq(qUpdated[2]) + sq(qUpdated[3]));
+    quatMag = sqrtf(sq(qUpdated[0]) + sq(qUpdated[1]) + sq(qUpdated[2]) + sq(qUpdated[3]));
     if (quatMag > 1e-16f)
     {
         float quatMagInv = 1.0f/quatMag;
@@ -309,17 +150,12 @@ void  UpdateStrapdownEquationsNED()
     states[9] = states[9] + 0.5f*(states[6] + lastVelocity[2])*dtIMU;
 
     // Constrain states (to protect against filter divergence)
-    ConstrainStates();
+    //ConstrainStates();
 }
 
-void CovariancePrediction(float dt)
+void AttPosEKF::CovariancePrediction(float dt)
 {
     // scalars
-    float windVelSigma;
-    float dAngBiasSigma;
-    // float dVelBiasSigma;
-    float magEarthSigma;
-    float magBodySigma;
     float daxCov;
     float dayCov;
     float dazCov;
@@ -349,7 +185,6 @@ void CovariancePrediction(float dt)
     float nextP[21][21];
 
     // calculate covariance prediction process noise
-    const float yawVarScale = 1.0f;
     windVelSigma = dt*0.1f;
     dAngBiasSigma = dt*5.0e-7f;
     magEarthSigma = dt*3.0e-4f;
@@ -953,7 +788,7 @@ void CovariancePrediction(float dt)
     ConstrainVariances();
 }
 
-void FuseVelposNED()
+void AttPosEKF::FuseVelposNED()
 {
 
 // declare variables used by fault isolation logic
@@ -999,8 +834,8 @@ void FuseVelposNED()
         observation[5] = -(hgtMea);
 
         // Estimate the GPS Velocity, GPS horiz position and height measurement variances.
-        velErr = 0.2*accNavMag; // additional error in GPS velocities caused by manoeuvring
-        posErr = 0.2*accNavMag; // additional error in GPS position caused by manoeuvring
+        velErr = 0.2f*accNavMag; // additional error in GPS velocities caused by manoeuvring
+        posErr = 0.2f*accNavMag; // additional error in GPS position caused by manoeuvring
         R_OBS[0] = 0.04f + sq(velErr);
         R_OBS[1] = R_OBS[0];
         R_OBS[2] = 0.08f + sq(velErr);
@@ -1026,7 +861,7 @@ void FuseVelposNED()
                 varInnovVelPos[i] = P[stateIndex][stateIndex] + R_OBS[i];
             }
             // apply a 5-sigma threshold
-            current_ekf_state.velHealth = (sq(velInnov[0]) + sq(velInnov[1]) + sq(velInnov[2])) < 25.0*(varInnovVelPos[0] + varInnovVelPos[1] + varInnovVelPos[2]);
+            current_ekf_state.velHealth = (sq(velInnov[0]) + sq(velInnov[1]) + sq(velInnov[2])) < 25.0f * (varInnovVelPos[0] + varInnovVelPos[1] + varInnovVelPos[2]);
             current_ekf_state.velTimeout = (millis() - current_ekf_state.velFailTime) > horizRetryTime;
             if (current_ekf_state.velHealth || current_ekf_state.velTimeout)
             {
@@ -1175,7 +1010,7 @@ void FuseVelposNED()
     //printf("velh: %s, posh: %s, hgth: %s\n", ((velHealth) ? "OK" : "FAIL"), ((posHealth) ? "OK" : "FAIL"), ((hgtHealth) ? "OK" : "FAIL"));
 }
 
-void FuseMagnetometer()
+void AttPosEKF::FuseMagnetometer()
 {
     uint8_t obsIndex;
     uint8_t indexLimit;
@@ -1482,7 +1317,7 @@ void FuseMagnetometer()
     ConstrainVariances();
 }
 
-void FuseAirspeed()
+void AttPosEKF::FuseAirspeed()
 {
     float vn;
     float ve;
@@ -1503,14 +1338,14 @@ void FuseAirspeed()
 
     // Need to check that it is flying before fusing airspeed data
     // Calculate the predicted airspeed
-    VtasPred = sqrt((ve - vwe)*(ve - vwe) + (vn - vwn)*(vn - vwn) + vd*vd);
+    VtasPred = sqrtf((ve - vwe)*(ve - vwe) + (vn - vwn)*(vn - vwn) + vd*vd);
     // Perform fusion of True Airspeed measurement
-    if (useAirspeed && fuseVtasData && (VtasPred > 1.0) && (VtasMeas > 8.0))
+    if (useAirspeed && fuseVtasData && (VtasPred > 1.0f) && (VtasMeas > 8.0f))
     {
         // Calculate observation jacobians
         SH_TAS[0] = 1/(sqrt(sq(ve - vwe) + sq(vn - vwn) + sq(vd)));
-        SH_TAS[1] = (SH_TAS[0]*(2*ve - 2*vwe))/2;
-        SH_TAS[2] = (SH_TAS[0]*(2*vn - 2*vwn))/2;
+        SH_TAS[1] = (SH_TAS[0]*(2.0f*ve - 2*vwe))/2.0f;
+        SH_TAS[2] = (SH_TAS[0]*(2.0f*vn - 2*vwn))/2.0f;
         
         float H_TAS[21];
         for (uint8_t i=0; i<=20; i++) H_TAS[i] = 0.0f;
@@ -1611,7 +1446,7 @@ void FuseAirspeed()
     ConstrainVariances();
 }
 
-void zeroRows(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last)
+void AttPosEKF::zeroRows(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last)
 {
     uint8_t row;
     uint8_t col;
@@ -1624,7 +1459,7 @@ void zeroRows(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last)
     }
 }
 
-void zeroCols(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last)
+void AttPosEKF::zeroCols(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last)
 {
     uint8_t row;
     uint8_t col;
@@ -1637,13 +1472,13 @@ void zeroCols(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last)
     }
 }
 
-float sq(float valIn)
+float AttPosEKF::sq(float valIn)
 {
     return valIn*valIn;
 }
 
 // Store states in a history array along with time stamp
-void StoreStates(uint64_t timestamp_ms)
+void AttPosEKF::StoreStates(uint64_t timestamp_ms)
 {
     for (unsigned i=0; i<n_states; i++)
         storedStates[i][storeIndex] = states[i];
@@ -1653,7 +1488,7 @@ void StoreStates(uint64_t timestamp_ms)
         storeIndex = 0;
 }
 
-void ResetStoredStates()
+void AttPosEKF::ResetStoredStates()
 {
     // reset all stored states
     memset(&storedStates[0][0], 0, sizeof(storedStates));
@@ -1674,7 +1509,7 @@ void ResetStoredStates()
 }
 
 // Output the state vector stored at the time that best matches that specified by msec
-int RecallStates(float statesForFusion[n_states], uint64_t msec)
+int AttPosEKF::RecallStates(float statesForFusion[n_states], uint64_t msec)
 {
     int ret = 0;
 
@@ -1723,7 +1558,7 @@ int RecallStates(float statesForFusion[n_states], uint64_t msec)
     return ret;
 }
 
-void quat2Tnb(Mat3f &Tnb, const float (&quat)[4])
+void AttPosEKF::quat2Tnb(Mat3f &Tnb, const float (&quat)[4])
 {
     // Calculate the nav to body cosine matrix
     float q00 = sq(quat[0]);
@@ -1748,7 +1583,7 @@ void quat2Tnb(Mat3f &Tnb, const float (&quat)[4])
     Tnb.y.z = 2*(q23 + q01);
 }
 
-void quat2Tbn(Mat3f &Tbn, const float (&quat)[4])
+void AttPosEKF::quat2Tbn(Mat3f &Tbn, const float (&quat)[4])
 {
     // Calculate the body to nav cosine matrix
     float q00 = sq(quat[0]);
@@ -1773,7 +1608,7 @@ void quat2Tbn(Mat3f &Tbn, const float (&quat)[4])
     Tbn.z.y = 2*(q23 + q01);
 }
 
-void eul2quat(float (&quat)[4], const float (&eul)[3])
+void AttPosEKF::eul2quat(float (&quat)[4], const float (&eul)[3])
 {
     float u1 = cos(0.5f*eul[0]);
     float u2 = cos(0.5f*eul[1]);
@@ -1787,35 +1622,35 @@ void eul2quat(float (&quat)[4], const float (&eul)[3])
     quat[3] = u1*u2*u6-u4*u5*u3;
 }
 
-void quat2eul(float (&y)[3], const float (&u)[4])
+void AttPosEKF::quat2eul(float (&y)[3], const float (&u)[4])
 {
-    y[0] = atan2((2.0*(u[2]*u[3]+u[0]*u[1])) , (u[0]*u[0]-u[1]*u[1]-u[2]*u[2]+u[3]*u[3]));
-    y[1] = -asin(2.0*(u[1]*u[3]-u[0]*u[2]));
-    y[2] = atan2((2.0*(u[1]*u[2]+u[0]*u[3])) , (u[0]*u[0]+u[1]*u[1]-u[2]*u[2]-u[3]*u[3]));
+    y[0] = atan2f((2.0f*(u[2]*u[3]+u[0]*u[1])) , (u[0]*u[0]-u[1]*u[1]-u[2]*u[2]+u[3]*u[3]));
+    y[1] = -asinf(2.0f*(u[1]*u[3]-u[0]*u[2]));
+    y[2] = atan2f((2.0f*(u[1]*u[2]+u[0]*u[3])) , (u[0]*u[0]+u[1]*u[1]-u[2]*u[2]-u[3]*u[3]));
 }
 
-void calcvelNED(float (&velNED)[3], float gpsCourse, float gpsGndSpd, float gpsVelD)
+void AttPosEKF::calcvelNED(float (&velNED)[3], float gpsCourse, float gpsGndSpd, float gpsVelD)
 {
-    velNED[0] = gpsGndSpd*cos(gpsCourse);
-    velNED[1] = gpsGndSpd*sin(gpsCourse);
+    velNED[0] = gpsGndSpd*cosf(gpsCourse);
+    velNED[1] = gpsGndSpd*sinf(gpsCourse);
     velNED[2] = gpsVelD;
 }
 
-void calcposNED(float (&posNED)[3], float lat, float lon, float hgt, float latRef, float lonRef, float hgtRef)
+void AttPosEKF::calcposNED(float (&posNED)[3], float lat, float lon, float hgt, float latRef, float lonRef, float hgtRef)
 {
     posNED[0] = earthRadius * (lat - latRef);
     posNED[1] = earthRadius * cos(latRef) * (lon - lonRef);
     posNED[2] = -(hgt - hgtRef);
 }
 
-void calcLLH(float (&posNED)[3], float lat, float lon, float hgt, float latRef, float lonRef, float hgtRef)
+void AttPosEKF::calcLLH(float (&posNED)[3], float lat, float lon, float hgt, float latRef, float lonRef, float hgtRef)
 {
     lat = latRef + posNED[0] * earthRadiusInv;
     lon = lonRef + posNED[1] * earthRadiusInv / cos(latRef);
     hgt = hgtRef - posNED[2];
 }
 
-void OnGroundCheck()
+void AttPosEKF::OnGroundCheck()
 {
     onGround = (((sq(velNED[0]) + sq(velNED[1]) + sq(velNED[2])) < 4.0f) && (VtasMeas < 8.0f));
     if (staticMode) {
@@ -1823,7 +1658,7 @@ void OnGroundCheck()
     }
 }
 
-void calcEarthRateNED(Vector3f &omega, float latitude)
+void AttPosEKF::calcEarthRateNED(Vector3f &omega, float latitude)
 {
     //Define Earth rotation vector in the NED navigation frame
     omega.x  = earthRate*cosf(latitude);
@@ -1831,13 +1666,13 @@ void calcEarthRateNED(Vector3f &omega, float latitude)
     omega.z  = -earthRate*sinf(latitude);
 }
 
-void CovarianceInit()
+void AttPosEKF::CovarianceInit()
 {
     // Calculate the initial covariance matrix P
-    P[0][0]   = 0.25f*sq(1.0f*deg2rad);
-    P[1][1]   = 0.25f*sq(1.0f*deg2rad);
-    P[2][2]   = 0.25f*sq(1.0f*deg2rad);
-    P[3][3]   = 0.25f*sq(10.0f*deg2rad);
+    P[0][0]   = 0.25f * sq(1.0f*deg2rad);
+    P[1][1]   = 0.25f * sq(1.0f*deg2rad);
+    P[2][2]   = 0.25f * sq(1.0f*deg2rad);
+    P[3][3]   = 0.25f * sq(10.0f*deg2rad);
     P[4][4]   = sq(0.7);
     P[5][5]   = P[4][4];
     P[6][6]   = sq(0.7);
@@ -1857,12 +1692,12 @@ void CovarianceInit()
     P[20][20] = P[18][18];
 }
 
-float ConstrainFloat(float val, float min, float max)
+float AttPosEKF::ConstrainFloat(float val, float min, float max)
 {
     return (val > max) ? max : ((val < min) ? min : val);
 }
 
-void ConstrainVariances()
+void AttPosEKF::ConstrainVariances()
 {
     if (!numericalProtection) {
         return;
@@ -1914,7 +1749,7 @@ void ConstrainVariances()
 
 }
 
-void ConstrainStates()
+void AttPosEKF::ConstrainStates()
 {
     if (!numericalProtection) {
         return;
@@ -1971,7 +1806,7 @@ void ConstrainStates()
 
 }
 
-void ForceSymmetry()
+void AttPosEKF::ForceSymmetry()
 {
     if (!numericalProtection) {
         return;
@@ -1989,7 +1824,7 @@ void ForceSymmetry()
     }
 }
 
-bool FilterHealthy()
+bool AttPosEKF::FilterHealthy()
 {
     if (!statesInitialised) {
         return false;
@@ -2012,7 +1847,7 @@ bool FilterHealthy()
  * This resets the position to the last GPS measurement
  * or to zero in case of static position.
  */
-void ResetPosition(void)
+void AttPosEKF::ResetPosition(void)
 {
     if (staticMode) {
         states[7] = 0;
@@ -2030,7 +1865,7 @@ void ResetPosition(void)
  *
  * This resets the height state with the last altitude measurements
  */
-void ResetHeight(void)
+void AttPosEKF::ResetHeight(void)
 {
     // write to the state vector
     states[9]   = -hgtMea;
@@ -2039,7 +1874,7 @@ void ResetHeight(void)
 /**
  * Reset the velocity state.
  */
-void ResetVelocity(void)
+void AttPosEKF::ResetVelocity(void)
 {
     if (staticMode) {
         states[4] = 0.0f;
@@ -2054,7 +1889,7 @@ void ResetVelocity(void)
 }
 
 
-void FillErrorReport(struct ekf_status_report *err)
+void AttPosEKF::FillErrorReport(struct ekf_status_report *err)
 {
     for (int i = 0; i < n_states; i++)
     {
@@ -2069,7 +1904,7 @@ void FillErrorReport(struct ekf_status_report *err)
     err->hgtTimeout = current_ekf_state.hgtTimeout;
 }
 
-bool StatesNaN(struct ekf_status_report *err_report) {
+bool AttPosEKF::StatesNaN(struct ekf_status_report *err_report) {
     bool err = false;
 
     // check all states and covariance matrices
@@ -2122,7 +1957,7 @@ bool StatesNaN(struct ekf_status_report *err_report) {
  * updated, but before any of the fusion steps are
  * executed.
  */
-int CheckAndBound()
+int AttPosEKF::CheckAndBound()
 {
 
     // Store the old filter state
@@ -2131,7 +1966,7 @@ int CheckAndBound()
     // Reset the filter if the states went NaN
     if (StatesNaN(&last_ekf_error)) {
 
-        InitializeDynamic(velNED);
+        InitializeDynamic(velNED, magDeclination);
 
         return 1;
     }
@@ -2164,7 +1999,7 @@ int CheckAndBound()
     return 0;
 }
 
-void AttitudeInit(float ax, float ay, float az, float mx, float my, float mz, float *initQuat)
+void AttPosEKF::AttitudeInit(float ax, float ay, float az, float mx, float my, float mz, float declination, float *initQuat)
 {
     float initialRoll, initialPitch;
     float cosRoll, sinRoll, cosPitch, sinPitch;
@@ -2184,6 +2019,8 @@ void AttitudeInit(float ax, float ay, float az, float mx, float my, float mz, fl
     magY = my * cosRoll - mz * sinRoll;
 
     initialHdg = atan2f(-magY, magX);
+    /* true heading is the mag heading minus declination */
+    initialHdg += declination;
 
     cosRoll = cosf(initialRoll * 0.5f);
     sinRoll = sinf(initialRoll * 0.5f);
@@ -2200,19 +2037,21 @@ void AttitudeInit(float ax, float ay, float az, float mx, float my, float mz, fl
     initQuat[3] = cosRoll * cosPitch * sinHeading - sinRoll * sinPitch * cosHeading;
 }
 
-void InitializeDynamic(float (&initvelNED)[3])
+void AttPosEKF::InitializeDynamic(float (&initvelNED)[3], float declination)
 {
 
     // Clear the init flag
     statesInitialised = false;
 
+    magDeclination = declination;
+
     ZeroVariables();
 
     // Calculate initial filter quaternion states from raw measurements
     float initQuat[4];
     Vector3f initMagXYZ;
     initMagXYZ   = magData - magBias;
-    AttitudeInit(accel.x, accel.y, accel.z, initMagXYZ.x, initMagXYZ.y, initMagXYZ.z, initQuat);
+    AttitudeInit(accel.x, accel.y, accel.z, initMagXYZ.x, initMagXYZ.y, initMagXYZ.z, magDeclination, initQuat);
 
     // Calculate initial Tbn matrix and rotate Mag measurements into NED
     // to set initial NED magnetic field states
@@ -2254,19 +2093,19 @@ void InitializeDynamic(float (&initvelNED)[3])
     summedDelVel.z = 0.0f;
 }
 
-void InitialiseFilter(float (&initvelNED)[3])
+void AttPosEKF::InitialiseFilter(float (&initvelNED)[3], double referenceLat, double referenceLon, float referenceHgt, float declination)
 {
     //store initial lat,long and height
-    latRef = gpsLat;
-    lonRef = gpsLon;
-    hgtRef = gpsHgt;
+    latRef = referenceLat;
+    lonRef = referenceLon;
+    hgtRef = referenceHgt;
 
     memset(&last_ekf_error, 0, sizeof(last_ekf_error));
 
-    InitializeDynamic(initvelNED);
+    InitializeDynamic(initvelNED, declination);
 }
 
-void ZeroVariables()
+void AttPosEKF::ZeroVariables()
 {
     // Do the data structure init
     for (unsigned i = 0; i < n_states; i++) {
@@ -2292,12 +2131,12 @@ void ZeroVariables()
     memset(&current_ekf_state, 0, sizeof(current_ekf_state));
 }
 
-void GetFilterState(struct ekf_status_report *state)
+void AttPosEKF::GetFilterState(struct ekf_status_report *state)
 {
     memcpy(state, &current_ekf_state, sizeof(state));
 }
 
-void GetLastErrorState(struct ekf_status_report *last_error)
+void AttPosEKF::GetLastErrorState(struct ekf_status_report *last_error)
 {
     memcpy(last_error, &last_ekf_error, sizeof(last_error));
 }
diff --git a/src/modules/ekf_att_pos_estimator/estimator_21states.h b/src/modules/ekf_att_pos_estimator/estimator_21states.h
new file mode 100644
index 000000000..a19ff1995
--- /dev/null
+++ b/src/modules/ekf_att_pos_estimator/estimator_21states.h
@@ -0,0 +1,247 @@
+#pragma once
+
+#include "estimator_utilities.h"
+
+class AttPosEKF {
+
+public:
+
+    AttPosEKF();
+    ~AttPosEKF();
+
+    /* ##############################################
+     *
+     *   M A I N    F I L T E R    P A R A M E T E R S
+     *
+     * ########################################### */
+
+    /*
+     * parameters are defined here and initialised in
+     * the InitialiseParameters() (which is just 20 lines down)
+     */
+
+    float covTimeStepMax; // maximum time allowed between covariance predictions
+    float covDelAngMax; // maximum delta angle between covariance predictions
+    float rngFinderPitch; // pitch angle of laser range finder in radians. Zero is aligned with the Z body axis. Positive is RH rotation about Y body axis.
+
+    float yawVarScale;
+    float windVelSigma;
+    float dAngBiasSigma;
+    float dVelBiasSigma;
+    float magEarthSigma;
+    float magBodySigma;
+    float gndHgtSigma;
+
+    float vneSigma;
+    float vdSigma;
+    float posNeSigma;
+    float posDSigma;
+    float magMeasurementSigma;
+    float airspeedMeasurementSigma;
+
+    float gyroProcessNoise;
+    float accelProcessNoise;
+
+    float EAS2TAS; // ratio f true to equivalent airspeed
+
+    void InitialiseParameters()
+    {
+        covTimeStepMax = 0.07f; // maximum time allowed between covariance predictions
+        covDelAngMax = 0.02f; // maximum delta angle between covariance predictions
+        rngFinderPitch = 0.0f; // pitch angle of laser range finder in radians. Zero is aligned with the Z body axis. Positive is RH rotation about Y body axis.
+        EAS2TAS = 1.0f;
+
+        yawVarScale = 1.0f;
+        windVelSigma = 0.1f;
+        dAngBiasSigma = 5.0e-7f;
+        dVelBiasSigma = 1e-4f;
+        magEarthSigma = 3.0e-4f;
+        magBodySigma  = 3.0e-4f;
+        gndHgtSigma  = 0.02f; // assume 2% terrain gradient 1-sigma
+
+        vneSigma = 0.2f;
+        vdSigma = 0.3f;
+        posNeSigma = 2.0f;
+        posDSigma = 2.0f;
+
+        magMeasurementSigma = 0.05;
+        airspeedMeasurementSigma = 1.4f;
+        gyroProcessNoise = 1.4544411e-2f;
+        accelProcessNoise = 0.5f;
+    }
+
+    // Global variables
+    float KH[n_states][n_states]; //  intermediate result used for covariance updates
+    float KHP[n_states][n_states]; // intermediate result used for covariance updates
+    float P[n_states][n_states]; // covariance matrix
+    float Kfusion[n_states]; // Kalman gains
+    float states[n_states]; // state matrix
+    float storedStates[n_states][data_buffer_size]; // state vectors stored for the last 50 time steps
+    uint32_t statetimeStamp[data_buffer_size]; // time stamp for each state vector stored
+
+    float statesAtVelTime[n_states]; // States at the effective measurement time for posNE and velNED measurements
+    float statesAtPosTime[n_states]; // States at the effective measurement time for posNE and velNED measurements
+    float statesAtHgtTime[n_states]; // States at the effective measurement time for the hgtMea measurement
+    float statesAtMagMeasTime[n_states]; // filter satates at the effective measurement time
+    float statesAtVtasMeasTime[n_states]; // filter states at the effective measurement time
+
+    Vector3f correctedDelAng; // delta angles about the xyz body axes corrected for errors (rad)
+    Vector3f correctedDelVel; // delta velocities along the XYZ body axes corrected for errors (m/s)
+    Vector3f summedDelAng; // summed delta angles about the xyz body axes corrected for errors (rad)
+    Vector3f summedDelVel; // summed delta velocities along the XYZ body axes corrected for errors (m/s)
+    float accNavMag; // magnitude of navigation accel (- used to adjust GPS obs variance (m/s^2)
+    Vector3f earthRateNED; // earths angular rate vector in NED (rad/s)
+    Vector3f angRate; // angular rate vector in XYZ body axes measured by the IMU (rad/s)
+    Vector3f accel; // acceleration vector in XYZ body axes measured by the IMU (m/s^2)
+    Vector3f dVelIMU;
+    Vector3f dAngIMU;
+    float dtIMU; // time lapsed since the last IMU measurement or covariance update (sec)
+    uint8_t fusionModeGPS; // 0 = GPS outputs 3D velocity, 1 = GPS outputs 2D velocity, 2 = GPS outputs no velocity
+    float innovVelPos[6]; // innovation output
+    float varInnovVelPos[6]; // innovation variance output
+
+    float velNED[3]; // North, East, Down velocity obs (m/s)
+    float posNE[2]; // North, East position obs (m)
+    float hgtMea; //  measured height (m)
+    float posNED[3]; // North, East Down position (m)
+
+    float innovMag[3]; // innovation output
+    float varInnovMag[3]; // innovation variance output
+    Vector3f magData; // magnetometer flux radings in X,Y,Z body axes
+    float innovVtas; // innovation output
+    float varInnovVtas; // innovation variance output
+    float VtasMeas; // true airspeed measurement (m/s)
+    float magDeclination;
+    float latRef; // WGS-84 latitude of reference point (rad)
+    float lonRef; // WGS-84 longitude of reference point (rad)
+    float hgtRef; // WGS-84 height of reference point (m)
+    Vector3f magBias; // states representing magnetometer bias vector in XYZ body axes
+    uint8_t covSkipCount; // Number of state prediction frames (IMU daya updates to skip before doing the covariance prediction
+
+    // GPS input data variables
+    float gpsCourse;
+    float gpsVelD;
+    float gpsLat;
+    float gpsLon;
+    float gpsHgt;
+    uint8_t GPSstatus;
+
+    // Baro input
+    float baroHgt;
+
+    bool statesInitialised;
+
+    bool fuseVelData; // this boolean causes the posNE and velNED obs to be fused
+    bool fusePosData; // this boolean causes the posNE and velNED obs to be fused
+    bool fuseHgtData; // this boolean causes the hgtMea obs to be fused
+    bool fuseMagData; // boolean true when magnetometer data is to be fused
+    bool fuseVtasData; // boolean true when airspeed data is to be fused
+
+    bool onGround;    ///< boolean true when the flight vehicle is on the ground (not flying)
+    bool staticMode;    ///< boolean true if no position feedback is fused
+    bool useAirspeed;    ///< boolean true if airspeed data is being used
+    bool useCompass;    ///< boolean true if magnetometer data is being used
+
+    struct ekf_status_report current_ekf_state;
+    struct ekf_status_report last_ekf_error;
+
+    bool numericalProtection;
+
+    unsigned storeIndex;
+
+
+void  UpdateStrapdownEquationsNED();
+
+void CovariancePrediction(float dt);
+
+void FuseVelposNED();
+
+void FuseMagnetometer();
+
+void FuseAirspeed();
+
+void zeroRows(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last);
+
+void zeroCols(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last);
+
+void quatNorm(float (&quatOut)[4], const float quatIn[4]);
+
+// store staes along with system time stamp in msces
+void StoreStates(uint64_t timestamp_ms);
+
+/**
+ * Recall the state vector.
+ *
+ * Recalls the vector stored at closest time to the one specified by msec
+ *
+ * @return zero on success, integer indicating the number of invalid states on failure.
+ *         Does only copy valid states, if the statesForFusion vector was initialized
+ *         correctly by the caller, the result can be safely used, but is a mixture
+ *         time-wise where valid states were updated and invalid remained at the old
+ *         value.
+ */
+int RecallStates(float statesForFusion[n_states], uint64_t msec);
+
+void ResetStoredStates();
+
+void quat2Tbn(Mat3f &Tbn, const float (&quat)[4]);
+
+void calcEarthRateNED(Vector3f &omega, float latitude);
+
+static void eul2quat(float (&quat)[4], const float (&eul)[3]);
+
+static void quat2eul(float (&eul)[3], const float (&quat)[4]);
+
+static void calcvelNED(float (&velNED)[3], float gpsCourse, float gpsGndSpd, float gpsVelD);
+
+static void calcposNED(float (&posNED)[3], float lat, float lon, float hgt, float latRef, float lonRef, float hgtRef);
+
+static void calcLLH(float (&posNED)[3], float lat, float lon, float hgt, float latRef, float lonRef, float hgtRef);
+
+static void quat2Tnb(Mat3f &Tnb, const float (&quat)[4]);
+
+static float sq(float valIn);
+
+void OnGroundCheck();
+
+void CovarianceInit();
+
+void InitialiseFilter(float (&initvelNED)[3], double referenceLat, double referenceLon, float referenceHgt, float declination);
+
+float ConstrainFloat(float val, float min, float max);
+
+void ConstrainVariances();
+
+void ConstrainStates();
+
+void ForceSymmetry();
+
+int CheckAndBound();
+
+void ResetPosition();
+
+void ResetVelocity();
+
+void ZeroVariables();
+
+void GetFilterState(struct ekf_status_report *state);
+
+void GetLastErrorState(struct ekf_status_report *last_error);
+
+bool StatesNaN(struct ekf_status_report *err_report);
+void FillErrorReport(struct ekf_status_report *err);
+
+void InitializeDynamic(float (&initvelNED)[3], float declination);
+
+protected:
+
+bool FilterHealthy();
+
+void ResetHeight(void);
+
+void AttitudeInit(float ax, float ay, float az, float mx, float my, float mz, float declination, float *initQuat);
+
+};
+
+uint32_t millis();
+
diff --git a/src/modules/ekf_att_pos_estimator/estimator_23states.cpp b/src/modules/ekf_att_pos_estimator/estimator_23states.cpp
new file mode 100644
index 000000000..9622f7e40
--- /dev/null
+++ b/src/modules/ekf_att_pos_estimator/estimator_23states.cpp
@@ -0,0 +1,2641 @@
+#include "estimator_23states.h"
+#include <string.h>
+#include <stdio.h>
+#include <stdarg.h>
+
+#define EKF_COVARIANCE_DIVERGED 1.0e8f
+
+AttPosEKF::AttPosEKF()
+
+    /* NOTE: DO NOT initialize class members here. Use ZeroVariables()
+     * instead to allow clean in-air re-initialization.
+     */
+{
+    summedDelAng.zero();
+    summedDelVel.zero();
+
+    fusionModeGPS = 0;
+    fuseVelData = false;
+    fusePosData = false;
+    fuseHgtData = false;
+    fuseMagData = false;
+    fuseVtasData = false;
+    onGround = true;
+    staticMode = true;
+    useAirspeed = true;
+    useCompass = true;
+    useRangeFinder = true;
+    numericalProtection = true;
+    refSet = false;
+    storeIndex = 0;
+    gpsHgt = 0.0f;
+    baroHgt = 0.0f;
+    GPSstatus = 0;
+    VtasMeas = 0.0f;
+    magDeclination = 0.0f;
+    dAngIMU.zero();
+    dVelIMU.zero();
+    velNED[0] = 0.0f;
+    velNED[1] = 0.0f;
+    velNED[2] = 0.0f;
+    accelGPSNED[0] = 0.0f;
+    accelGPSNED[1] = 0.0f;
+    accelGPSNED[2] = 0.0f;
+    delAngTotal.zero();
+    ekfDiverged = false;
+    lastReset = 0;
+
+    memset(&last_ekf_error, 0, sizeof(last_ekf_error));
+    memset(&current_ekf_state, 0, sizeof(current_ekf_state));
+    ZeroVariables();
+    InitialiseParameters();
+}
+
+AttPosEKF::~AttPosEKF()
+{
+}
+
+void AttPosEKF::UpdateStrapdownEquationsNED()
+{
+    Vector3f delVelNav;
+    float q00;
+    float q11;
+    float q22;
+    float q33;
+    float q01;
+    float q02;
+    float q03;
+    float q12;
+    float q13;
+    float q23;
+    float rotationMag;
+    float qUpdated[4];
+    float quatMag;
+    float deltaQuat[4];
+    const Vector3f gravityNED = {0.0,0.0,GRAVITY_MSS};
+
+// Remove sensor bias errors
+    correctedDelAng.x = dAngIMU.x - states[10];
+    correctedDelAng.y = dAngIMU.y - states[11];
+    correctedDelAng.z = dAngIMU.z - states[12];
+    dVelIMU.x = dVelIMU.x;
+    dVelIMU.y = dVelIMU.y;
+    dVelIMU.z = dVelIMU.z - states[13];
+
+    delAngTotal.x += correctedDelAng.x;
+    delAngTotal.y += correctedDelAng.y;
+    delAngTotal.z += correctedDelAng.z;
+
+// Save current measurements
+    Vector3f  prevDelAng = correctedDelAng;
+
+// Apply corrections for earths rotation rate and coning errors
+// * and + operators have been overloaded
+    correctedDelAng   = correctedDelAng - Tnb*earthRateNED*dtIMU + 8.333333333333333e-2f*(prevDelAng % correctedDelAng);
+
+// Convert the rotation vector to its equivalent quaternion
+    rotationMag = correctedDelAng.length();
+    if (rotationMag < 1e-12f)
+    {
+        deltaQuat[0] = 1.0;
+        deltaQuat[1] = 0.0;
+        deltaQuat[2] = 0.0;
+        deltaQuat[3] = 0.0;
+    }
+    else
+    {
+        // We are using double here as we are unsure how small
+        // the angle differences are and if we get into numeric
+        // issues with float. The runtime impact is not measurable
+        // for these quantities.
+        deltaQuat[0] = cos(0.5*(double)rotationMag);
+        float rotScaler = (sin(0.5*(double)rotationMag))/(double)rotationMag;
+        deltaQuat[1] = correctedDelAng.x*rotScaler;
+        deltaQuat[2] = correctedDelAng.y*rotScaler;
+        deltaQuat[3] = correctedDelAng.z*rotScaler;
+    }
+
+// Update the quaternions by rotating from the previous attitude through
+// the delta angle rotation quaternion
+    qUpdated[0] = states[0]*deltaQuat[0] - states[1]*deltaQuat[1] - states[2]*deltaQuat[2] - states[3]*deltaQuat[3];
+    qUpdated[1] = states[0]*deltaQuat[1] + states[1]*deltaQuat[0] + states[2]*deltaQuat[3] - states[3]*deltaQuat[2];
+    qUpdated[2] = states[0]*deltaQuat[2] + states[2]*deltaQuat[0] + states[3]*deltaQuat[1] - states[1]*deltaQuat[3];
+    qUpdated[3] = states[0]*deltaQuat[3] + states[3]*deltaQuat[0] + states[1]*deltaQuat[2] - states[2]*deltaQuat[1];
+
+// Normalise the quaternions and update the quaternion states
+    quatMag = sqrtf(sq(qUpdated[0]) + sq(qUpdated[1]) + sq(qUpdated[2]) + sq(qUpdated[3]));
+    if (quatMag > 1e-16f)
+    {
+        float quatMagInv = 1.0f/quatMag;
+        states[0] = quatMagInv*qUpdated[0];
+        states[1] = quatMagInv*qUpdated[1];
+        states[2] = quatMagInv*qUpdated[2];
+        states[3] = quatMagInv*qUpdated[3];
+    }
+
+// Calculate the body to nav cosine matrix
+    q00 = sq(states[0]);
+    q11 = sq(states[1]);
+    q22 = sq(states[2]);
+    q33 = sq(states[3]);
+    q01 =  states[0]*states[1];
+    q02 =  states[0]*states[2];
+    q03 =  states[0]*states[3];
+    q12 =  states[1]*states[2];
+    q13 =  states[1]*states[3];
+    q23 =  states[2]*states[3];
+
+    Tbn.x.x = q00 + q11 - q22 - q33;
+    Tbn.y.y = q00 - q11 + q22 - q33;
+    Tbn.z.z = q00 - q11 - q22 + q33;
+    Tbn.x.y = 2*(q12 - q03);
+    Tbn.x.z = 2*(q13 + q02);
+    Tbn.y.x = 2*(q12 + q03);
+    Tbn.y.z = 2*(q23 - q01);
+    Tbn.z.x = 2*(q13 - q02);
+    Tbn.z.y = 2*(q23 + q01);
+
+    Tnb = Tbn.transpose();
+
+// transform body delta velocities to delta velocities in the nav frame
+// * and + operators have been overloaded
+    //delVelNav = Tbn*dVelIMU + gravityNED*dtIMU;
+    delVelNav.x = Tbn.x.x*dVelIMU.x + Tbn.x.y*dVelIMU.y + Tbn.x.z*dVelIMU.z + gravityNED.x*dtIMU;
+    delVelNav.y = Tbn.y.x*dVelIMU.x + Tbn.y.y*dVelIMU.y + Tbn.y.z*dVelIMU.z + gravityNED.y*dtIMU;
+    delVelNav.z = Tbn.z.x*dVelIMU.x + Tbn.z.y*dVelIMU.y + Tbn.z.z*dVelIMU.z + gravityNED.z*dtIMU;
+
+// calculate the magnitude of the nav acceleration (required for GPS
+// variance estimation)
+    accNavMag = delVelNav.length()/dtIMU;
+
+// If calculating position save previous velocity
+    float lastVelocity[3];
+    lastVelocity[0] = states[4];
+    lastVelocity[1] = states[5];
+    lastVelocity[2] = states[6];
+
+// Sum delta velocities to get velocity
+    states[4] = states[4] + delVelNav.x;
+    states[5] = states[5] + delVelNav.y;
+    states[6] = states[6] + delVelNav.z;
+
+// If calculating postions, do a trapezoidal integration for position
+    states[7] = states[7] + 0.5f*(states[4] + lastVelocity[0])*dtIMU;
+    states[8] = states[8] + 0.5f*(states[5] + lastVelocity[1])*dtIMU;
+    states[9] = states[9] + 0.5f*(states[6] + lastVelocity[2])*dtIMU;
+
+    // Constrain states (to protect against filter divergence)
+    ConstrainStates();
+}
+
+void AttPosEKF::CovariancePrediction(float dt)
+{
+    // scalars
+    float daxCov;
+    float dayCov;
+    float dazCov;
+    float dvxCov;
+    float dvyCov;
+    float dvzCov;
+    float dvx;
+    float dvy;
+    float dvz;
+    float dax;
+    float day;
+    float daz;
+    float q0;
+    float q1;
+    float q2;
+    float q3;
+    float dax_b;
+    float day_b;
+    float daz_b;
+    float dvz_b;
+
+    // arrays
+    float processNoise[n_states];
+    float SF[15];
+    float SG[8];
+    float SQ[11];
+    float SPP[8] = {0};
+    float nextP[n_states][n_states];
+
+    // calculate covariance prediction process noise
+    for (uint8_t i= 0; i<4;  i++) processNoise[i] = 1.0e-9f;
+    for (uint8_t i= 4; i<10;  i++) processNoise[i] = 1.0e-9f;
+    for (uint8_t i=10; i<=12; i++) processNoise[i] = dt * dAngBiasSigma;
+    // scale gyro bias noise when on ground to allow for faster bias estimation
+    for (uint8_t i=10; i<=12; i++) processNoise[i] = dt * dAngBiasSigma;
+    processNoise[13] = dVelBiasSigma;
+    for (uint8_t i=14; i<=15; i++) processNoise[i] = dt * windVelSigma;
+    for (uint8_t i=16; i<=18; i++) processNoise[i] = dt * magEarthSigma;
+    for (uint8_t i=19; i<=21; i++) processNoise[i] = dt * magBodySigma;
+    processNoise[22] = dt * sqrtf(sq(states[4]) + sq(states[5])) * gndHgtSigma;
+
+    // square all sigmas
+    for (unsigned i = 0; i < n_states; i++) processNoise[i] = sq(processNoise[i]);
+
+    // set variables used to calculate covariance growth
+    dvx = summedDelVel.x;
+    dvy = summedDelVel.y;
+    dvz = summedDelVel.z;
+    dax = summedDelAng.x;
+    day = summedDelAng.y;
+    daz = summedDelAng.z;
+    q0 = states[0];
+    q1 = states[1];
+    q2 = states[2];
+    q3 = states[3];
+    dax_b = states[10];
+    day_b = states[11];
+    daz_b = states[12];
+    dvz_b =  states[13];
+    gyroProcessNoise = ConstrainFloat(gyroProcessNoise, 1e-3f, 5e-2f);
+    daxCov = sq(dt*gyroProcessNoise);
+    dayCov = sq(dt*gyroProcessNoise);
+    dazCov = sq(dt*gyroProcessNoise);
+    if (onGround) dazCov = dazCov * sq(yawVarScale);
+    accelProcessNoise = ConstrainFloat(accelProcessNoise, 5e-2, 1.0f);
+    dvxCov = sq(dt*accelProcessNoise);
+    dvyCov = sq(dt*accelProcessNoise);
+    dvzCov = sq(dt*accelProcessNoise);
+
+    // Predicted covariance calculation
+    SF[0] = dvz - dvz_b;
+    SF[1] = 2*q3*SF[0] + 2*dvx*q1 + 2*dvy*q2;
+    SF[2] = 2*dvx*q3 - 2*q1*SF[0] + 2*dvy*q0;
+    SF[3] = 2*q2*SF[0] + 2*dvx*q0 - 2*dvy*q3;
+    SF[4] = day/2 - day_b/2;
+    SF[5] = daz/2 - daz_b/2;
+    SF[6] = dax/2 - dax_b/2;
+    SF[7] = dax_b/2 - dax/2;
+    SF[8] = daz_b/2 - daz/2;
+    SF[9] = day_b/2 - day/2;
+    SF[10] = 2*q0*SF[0];
+    SF[11] = q1/2;
+    SF[12] = q2/2;
+    SF[13] = q3/2;
+    SF[14] = 2*dvy*q1;
+
+    SG[0] = q0/2;
+    SG[1] = sq(q3);
+    SG[2] = sq(q2);
+    SG[3] = sq(q1);
+    SG[4] = sq(q0);
+    SG[5] = 2*q2*q3;
+    SG[6] = 2*q1*q3;
+    SG[7] = 2*q1*q2;
+
+    SQ[0] = dvzCov*(SG[5] - 2*q0*q1)*(SG[1] - SG[2] - SG[3] + SG[4]) - dvyCov*(SG[5] + 2*q0*q1)*(SG[1] - SG[2] + SG[3] - SG[4]) + dvxCov*(SG[6] - 2*q0*q2)*(SG[7] + 2*q0*q3);
+    SQ[1] = dvzCov*(SG[6] + 2*q0*q2)*(SG[1] - SG[2] - SG[3] + SG[4]) - dvxCov*(SG[6] - 2*q0*q2)*(SG[1] + SG[2] - SG[3] - SG[4]) + dvyCov*(SG[5] + 2*q0*q1)*(SG[7] - 2*q0*q3);
+    SQ[2] = dvzCov*(SG[5] - 2*q0*q1)*(SG[6] + 2*q0*q2) - dvyCov*(SG[7] - 2*q0*q3)*(SG[1] - SG[2] + SG[3] - SG[4]) - dvxCov*(SG[7] + 2*q0*q3)*(SG[1] + SG[2] - SG[3] - SG[4]);
+    SQ[3] = (dayCov*q1*SG[0])/2 - (dazCov*q1*SG[0])/2 - (daxCov*q2*q3)/4;
+    SQ[4] = (dazCov*q2*SG[0])/2 - (daxCov*q2*SG[0])/2 - (dayCov*q1*q3)/4;
+    SQ[5] = (daxCov*q3*SG[0])/2 - (dayCov*q3*SG[0])/2 - (dazCov*q1*q2)/4;
+    SQ[6] = (daxCov*q1*q2)/4 - (dazCov*q3*SG[0])/2 - (dayCov*q1*q2)/4;
+    SQ[7] = (dazCov*q1*q3)/4 - (daxCov*q1*q3)/4 - (dayCov*q2*SG[0])/2;
+    SQ[8] = (dayCov*q2*q3)/4 - (daxCov*q1*SG[0])/2 - (dazCov*q2*q3)/4;
+    SQ[9] = sq(SG[0]);
+    SQ[10] = sq(q1);
+
+    SPP[0] = SF[10] + SF[14] - 2*dvx*q2;
+    SPP[1] = 2*q2*SF[0] + 2*dvx*q0 - 2*dvy*q3;
+    SPP[2] = 2*dvx*q3 - 2*q1*SF[0] + 2*dvy*q0;
+    SPP[3] = 2*q0*q1 - 2*q2*q3;
+    SPP[4] = 2*q0*q2 + 2*q1*q3;
+    SPP[5] = sq(q0) - sq(q1) - sq(q2) + sq(q3);
+    SPP[6] = SF[13];
+    SPP[7] = SF[12];
+
+    nextP[0][0] = P[0][0] + P[1][0]*SF[7] + P[2][0]*SF[9] + P[3][0]*SF[8] + P[10][0]*SF[11] + P[11][0]*SPP[7] + P[12][0]*SPP[6] + (daxCov*SQ[10])/4 + SF[7]*(P[0][1] + P[1][1]*SF[7] + P[2][1]*SF[9] + P[3][1]*SF[8] + P[10][1]*SF[11] + P[11][1]*SPP[7] + P[12][1]*SPP[6]) + SF[9]*(P[0][2] + P[1][2]*SF[7] + P[2][2]*SF[9] + P[3][2]*SF[8] + P[10][2]*SF[11] + P[11][2]*SPP[7] + P[12][2]*SPP[6]) + SF[8]*(P[0][3] + P[1][3]*SF[7] + P[2][3]*SF[9] + P[3][3]*SF[8] + P[10][3]*SF[11] + P[11][3]*SPP[7] + P[12][3]*SPP[6]) + SF[11]*(P[0][10] + P[1][10]*SF[7] + P[2][10]*SF[9] + P[3][10]*SF[8] + P[10][10]*SF[11] + P[11][10]*SPP[7] + P[12][10]*SPP[6]) + SPP[7]*(P[0][11] + P[1][11]*SF[7] + P[2][11]*SF[9] + P[3][11]*SF[8] + P[10][11]*SF[11] + P[11][11]*SPP[7] + P[12][11]*SPP[6]) + SPP[6]*(P[0][12] + P[1][12]*SF[7] + P[2][12]*SF[9] + P[3][12]*SF[8] + P[10][12]*SF[11] + P[11][12]*SPP[7] + P[12][12]*SPP[6]) + (dayCov*sq(q2))/4 + (dazCov*sq(q3))/4;
+    nextP[0][1] = P[0][1] + SQ[8] + P[1][1]*SF[7] + P[2][1]*SF[9] + P[3][1]*SF[8] + P[10][1]*SF[11] + P[11][1]*SPP[7] + P[12][1]*SPP[6] + SF[6]*(P[0][0] + P[1][0]*SF[7] + P[2][0]*SF[9] + P[3][0]*SF[8] + P[10][0]*SF[11] + P[11][0]*SPP[7] + P[12][0]*SPP[6]) + SF[5]*(P[0][2] + P[1][2]*SF[7] + P[2][2]*SF[9] + P[3][2]*SF[8] + P[10][2]*SF[11] + P[11][2]*SPP[7] + P[12][2]*SPP[6]) + SF[9]*(P[0][3] + P[1][3]*SF[7] + P[2][3]*SF[9] + P[3][3]*SF[8] + P[10][3]*SF[11] + P[11][3]*SPP[7] + P[12][3]*SPP[6]) + SPP[6]*(P[0][11] + P[1][11]*SF[7] + P[2][11]*SF[9] + P[3][11]*SF[8] + P[10][11]*SF[11] + P[11][11]*SPP[7] + P[12][11]*SPP[6]) - SPP[7]*(P[0][12] + P[1][12]*SF[7] + P[2][12]*SF[9] + P[3][12]*SF[8] + P[10][12]*SF[11] + P[11][12]*SPP[7] + P[12][12]*SPP[6]) - (q0*(P[0][10] + P[1][10]*SF[7] + P[2][10]*SF[9] + P[3][10]*SF[8] + P[10][10]*SF[11] + P[11][10]*SPP[7] + P[12][10]*SPP[6]))/2;
+    nextP[0][2] = P[0][2] + SQ[7] + P[1][2]*SF[7] + P[2][2]*SF[9] + P[3][2]*SF[8] + P[10][2]*SF[11] + P[11][2]*SPP[7] + P[12][2]*SPP[6] + SF[4]*(P[0][0] + P[1][0]*SF[7] + P[2][0]*SF[9] + P[3][0]*SF[8] + P[10][0]*SF[11] + P[11][0]*SPP[7] + P[12][0]*SPP[6]) + SF[8]*(P[0][1] + P[1][1]*SF[7] + P[2][1]*SF[9] + P[3][1]*SF[8] + P[10][1]*SF[11] + P[11][1]*SPP[7] + P[12][1]*SPP[6]) + SF[6]*(P[0][3] + P[1][3]*SF[7] + P[2][3]*SF[9] + P[3][3]*SF[8] + P[10][3]*SF[11] + P[11][3]*SPP[7] + P[12][3]*SPP[6]) + SF[11]*(P[0][12] + P[1][12]*SF[7] + P[2][12]*SF[9] + P[3][12]*SF[8] + P[10][12]*SF[11] + P[11][12]*SPP[7] + P[12][12]*SPP[6]) - SPP[6]*(P[0][10] + P[1][10]*SF[7] + P[2][10]*SF[9] + P[3][10]*SF[8] + P[10][10]*SF[11] + P[11][10]*SPP[7] + P[12][10]*SPP[6]) - (q0*(P[0][11] + P[1][11]*SF[7] + P[2][11]*SF[9] + P[3][11]*SF[8] + P[10][11]*SF[11] + P[11][11]*SPP[7] + P[12][11]*SPP[6]))/2;
+    nextP[0][3] = P[0][3] + SQ[6] + P[1][3]*SF[7] + P[2][3]*SF[9] + P[3][3]*SF[8] + P[10][3]*SF[11] + P[11][3]*SPP[7] + P[12][3]*SPP[6] + SF[5]*(P[0][0] + P[1][0]*SF[7] + P[2][0]*SF[9] + P[3][0]*SF[8] + P[10][0]*SF[11] + P[11][0]*SPP[7] + P[12][0]*SPP[6]) + SF[4]*(P[0][1] + P[1][1]*SF[7] + P[2][1]*SF[9] + P[3][1]*SF[8] + P[10][1]*SF[11] + P[11][1]*SPP[7] + P[12][1]*SPP[6]) + SF[7]*(P[0][2] + P[1][2]*SF[7] + P[2][2]*SF[9] + P[3][2]*SF[8] + P[10][2]*SF[11] + P[11][2]*SPP[7] + P[12][2]*SPP[6]) - SF[11]*(P[0][11] + P[1][11]*SF[7] + P[2][11]*SF[9] + P[3][11]*SF[8] + P[10][11]*SF[11] + P[11][11]*SPP[7] + P[12][11]*SPP[6]) + SPP[7]*(P[0][10] + P[1][10]*SF[7] + P[2][10]*SF[9] + P[3][10]*SF[8] + P[10][10]*SF[11] + P[11][10]*SPP[7] + P[12][10]*SPP[6]) - (q0*(P[0][12] + P[1][12]*SF[7] + P[2][12]*SF[9] + P[3][12]*SF[8] + P[10][12]*SF[11] + P[11][12]*SPP[7] + P[12][12]*SPP[6]))/2;
+    nextP[0][4] = P[0][4] + P[1][4]*SF[7] + P[2][4]*SF[9] + P[3][4]*SF[8] + P[10][4]*SF[11] + P[11][4]*SPP[7] + P[12][4]*SPP[6] + SF[3]*(P[0][0] + P[1][0]*SF[7] + P[2][0]*SF[9] + P[3][0]*SF[8] + P[10][0]*SF[11] + P[11][0]*SPP[7] + P[12][0]*SPP[6]) + SF[1]*(P[0][1] + P[1][1]*SF[7] + P[2][1]*SF[9] + P[3][1]*SF[8] + P[10][1]*SF[11] + P[11][1]*SPP[7] + P[12][1]*SPP[6]) + SPP[0]*(P[0][2] + P[1][2]*SF[7] + P[2][2]*SF[9] + P[3][2]*SF[8] + P[10][2]*SF[11] + P[11][2]*SPP[7] + P[12][2]*SPP[6]) - SPP[2]*(P[0][3] + P[1][3]*SF[7] + P[2][3]*SF[9] + P[3][3]*SF[8] + P[10][3]*SF[11] + P[11][3]*SPP[7] + P[12][3]*SPP[6]) - SPP[4]*(P[0][13] + P[1][13]*SF[7] + P[2][13]*SF[9] + P[3][13]*SF[8] + P[10][13]*SF[11] + P[11][13]*SPP[7] + P[12][13]*SPP[6]);
+    nextP[0][5] = P[0][5] + P[1][5]*SF[7] + P[2][5]*SF[9] + P[3][5]*SF[8] + P[10][5]*SF[11] + P[11][5]*SPP[7] + P[12][5]*SPP[6] + SF[2]*(P[0][0] + P[1][0]*SF[7] + P[2][0]*SF[9] + P[3][0]*SF[8] + P[10][0]*SF[11] + P[11][0]*SPP[7] + P[12][0]*SPP[6]) + SF[1]*(P[0][2] + P[1][2]*SF[7] + P[2][2]*SF[9] + P[3][2]*SF[8] + P[10][2]*SF[11] + P[11][2]*SPP[7] + P[12][2]*SPP[6]) + SF[3]*(P[0][3] + P[1][3]*SF[7] + P[2][3]*SF[9] + P[3][3]*SF[8] + P[10][3]*SF[11] + P[11][3]*SPP[7] + P[12][3]*SPP[6]) - SPP[0]*(P[0][1] + P[1][1]*SF[7] + P[2][1]*SF[9] + P[3][1]*SF[8] + P[10][1]*SF[11] + P[11][1]*SPP[7] + P[12][1]*SPP[6]) + SPP[3]*(P[0][13] + P[1][13]*SF[7] + P[2][13]*SF[9] + P[3][13]*SF[8] + P[10][13]*SF[11] + P[11][13]*SPP[7] + P[12][13]*SPP[6]);
+    nextP[0][6] = P[0][6] + P[1][6]*SF[7] + P[2][6]*SF[9] + P[3][6]*SF[8] + P[10][6]*SF[11] + P[11][6]*SPP[7] + P[12][6]*SPP[6] + SF[2]*(P[0][1] + P[1][1]*SF[7] + P[2][1]*SF[9] + P[3][1]*SF[8] + P[10][1]*SF[11] + P[11][1]*SPP[7] + P[12][1]*SPP[6]) + SF[1]*(P[0][3] + P[1][3]*SF[7] + P[2][3]*SF[9] + P[3][3]*SF[8] + P[10][3]*SF[11] + P[11][3]*SPP[7] + P[12][3]*SPP[6]) + SPP[0]*(P[0][0] + P[1][0]*SF[7] + P[2][0]*SF[9] + P[3][0]*SF[8] + P[10][0]*SF[11] + P[11][0]*SPP[7] + P[12][0]*SPP[6]) - SPP[1]*(P[0][2] + P[1][2]*SF[7] + P[2][2]*SF[9] + P[3][2]*SF[8] + P[10][2]*SF[11] + P[11][2]*SPP[7] + P[12][2]*SPP[6]) - (sq(q0) - sq(q1) - sq(q2) + sq(q3))*(P[0][13] + P[1][13]*SF[7] + P[2][13]*SF[9] + P[3][13]*SF[8] + P[10][13]*SF[11] + P[11][13]*SPP[7] + P[12][13]*SPP[6]);
+    nextP[0][7] = P[0][7] + P[1][7]*SF[7] + P[2][7]*SF[9] + P[3][7]*SF[8] + P[10][7]*SF[11] + P[11][7]*SPP[7] + P[12][7]*SPP[6] + dt*(P[0][4] + P[1][4]*SF[7] + P[2][4]*SF[9] + P[3][4]*SF[8] + P[10][4]*SF[11] + P[11][4]*SPP[7] + P[12][4]*SPP[6]);
+    nextP[0][8] = P[0][8] + P[1][8]*SF[7] + P[2][8]*SF[9] + P[3][8]*SF[8] + P[10][8]*SF[11] + P[11][8]*SPP[7] + P[12][8]*SPP[6] + dt*(P[0][5] + P[1][5]*SF[7] + P[2][5]*SF[9] + P[3][5]*SF[8] + P[10][5]*SF[11] + P[11][5]*SPP[7] + P[12][5]*SPP[6]);
+    nextP[0][9] = P[0][9] + P[1][9]*SF[7] + P[2][9]*SF[9] + P[3][9]*SF[8] + P[10][9]*SF[11] + P[11][9]*SPP[7] + P[12][9]*SPP[6] + dt*(P[0][6] + P[1][6]*SF[7] + P[2][6]*SF[9] + P[3][6]*SF[8] + P[10][6]*SF[11] + P[11][6]*SPP[7] + P[12][6]*SPP[6]);
+    nextP[0][10] = P[0][10] + P[1][10]*SF[7] + P[2][10]*SF[9] + P[3][10]*SF[8] + P[10][10]*SF[11] + P[11][10]*SPP[7] + P[12][10]*SPP[6];
+    nextP[0][11] = P[0][11] + P[1][11]*SF[7] + P[2][11]*SF[9] + P[3][11]*SF[8] + P[10][11]*SF[11] + P[11][11]*SPP[7] + P[12][11]*SPP[6];
+    nextP[0][12] = P[0][12] + P[1][12]*SF[7] + P[2][12]*SF[9] + P[3][12]*SF[8] + P[10][12]*SF[11] + P[11][12]*SPP[7] + P[12][12]*SPP[6];
+    nextP[0][13] = P[0][13] + P[1][13]*SF[7] + P[2][13]*SF[9] + P[3][13]*SF[8] + P[10][13]*SF[11] + P[11][13]*SPP[7] + P[12][13]*SPP[6];
+    nextP[0][14] = P[0][14] + P[1][14]*SF[7] + P[2][14]*SF[9] + P[3][14]*SF[8] + P[10][14]*SF[11] + P[11][14]*SPP[7] + P[12][14]*SPP[6];
+    nextP[0][15] = P[0][15] + P[1][15]*SF[7] + P[2][15]*SF[9] + P[3][15]*SF[8] + P[10][15]*SF[11] + P[11][15]*SPP[7] + P[12][15]*SPP[6];
+    nextP[0][16] = P[0][16] + P[1][16]*SF[7] + P[2][16]*SF[9] + P[3][16]*SF[8] + P[10][16]*SF[11] + P[11][16]*SPP[7] + P[12][16]*SPP[6];
+    nextP[0][17] = P[0][17] + P[1][17]*SF[7] + P[2][17]*SF[9] + P[3][17]*SF[8] + P[10][17]*SF[11] + P[11][17]*SPP[7] + P[12][17]*SPP[6];
+    nextP[0][18] = P[0][18] + P[1][18]*SF[7] + P[2][18]*SF[9] + P[3][18]*SF[8] + P[10][18]*SF[11] + P[11][18]*SPP[7] + P[12][18]*SPP[6];
+    nextP[0][19] = P[0][19] + P[1][19]*SF[7] + P[2][19]*SF[9] + P[3][19]*SF[8] + P[10][19]*SF[11] + P[11][19]*SPP[7] + P[12][19]*SPP[6];
+    nextP[0][20] = P[0][20] + P[1][20]*SF[7] + P[2][20]*SF[9] + P[3][20]*SF[8] + P[10][20]*SF[11] + P[11][20]*SPP[7] + P[12][20]*SPP[6];
+    nextP[0][21] = P[0][21] + P[1][21]*SF[7] + P[2][21]*SF[9] + P[3][21]*SF[8] + P[10][21]*SF[11] + P[11][21]*SPP[7] + P[12][21]*SPP[6];
+    nextP[0][22] = P[0][22] + P[1][22]*SF[7] + P[2][22]*SF[9] + P[3][22]*SF[8] + P[10][22]*SF[11] + P[11][22]*SPP[7] + P[12][22]*SPP[6];
+    nextP[1][0] = P[1][0] + SQ[8] + P[0][0]*SF[6] + P[2][0]*SF[5] + P[3][0]*SF[9] + P[11][0]*SPP[6] - P[12][0]*SPP[7] - (P[10][0]*q0)/2 + SF[7]*(P[1][1] + P[0][1]*SF[6] + P[2][1]*SF[5] + P[3][1]*SF[9] + P[11][1]*SPP[6] - P[12][1]*SPP[7] - (P[10][1]*q0)/2) + SF[9]*(P[1][2] + P[0][2]*SF[6] + P[2][2]*SF[5] + P[3][2]*SF[9] + P[11][2]*SPP[6] - P[12][2]*SPP[7] - (P[10][2]*q0)/2) + SF[8]*(P[1][3] + P[0][3]*SF[6] + P[2][3]*SF[5] + P[3][3]*SF[9] + P[11][3]*SPP[6] - P[12][3]*SPP[7] - (P[10][3]*q0)/2) + SF[11]*(P[1][10] + P[0][10]*SF[6] + P[2][10]*SF[5] + P[3][10]*SF[9] + P[11][10]*SPP[6] - P[12][10]*SPP[7] - (P[10][10]*q0)/2) + SPP[7]*(P[1][11] + P[0][11]*SF[6] + P[2][11]*SF[5] + P[3][11]*SF[9] + P[11][11]*SPP[6] - P[12][11]*SPP[7] - (P[10][11]*q0)/2) + SPP[6]*(P[1][12] + P[0][12]*SF[6] + P[2][12]*SF[5] + P[3][12]*SF[9] + P[11][12]*SPP[6] - P[12][12]*SPP[7] - (P[10][12]*q0)/2);
+    nextP[1][1] = P[1][1] + P[0][1]*SF[6] + P[2][1]*SF[5] + P[3][1]*SF[9] + P[11][1]*SPP[6] - P[12][1]*SPP[7] + daxCov*SQ[9] - (P[10][1]*q0)/2 + SF[6]*(P[1][0] + P[0][0]*SF[6] + P[2][0]*SF[5] + P[3][0]*SF[9] + P[11][0]*SPP[6] - P[12][0]*SPP[7] - (P[10][0]*q0)/2) + SF[5]*(P[1][2] + P[0][2]*SF[6] + P[2][2]*SF[5] + P[3][2]*SF[9] + P[11][2]*SPP[6] - P[12][2]*SPP[7] - (P[10][2]*q0)/2) + SF[9]*(P[1][3] + P[0][3]*SF[6] + P[2][3]*SF[5] + P[3][3]*SF[9] + P[11][3]*SPP[6] - P[12][3]*SPP[7] - (P[10][3]*q0)/2) + SPP[6]*(P[1][11] + P[0][11]*SF[6] + P[2][11]*SF[5] + P[3][11]*SF[9] + P[11][11]*SPP[6] - P[12][11]*SPP[7] - (P[10][11]*q0)/2) - SPP[7]*(P[1][12] + P[0][12]*SF[6] + P[2][12]*SF[5] + P[3][12]*SF[9] + P[11][12]*SPP[6] - P[12][12]*SPP[7] - (P[10][12]*q0)/2) + (dayCov*sq(q3))/4 + (dazCov*sq(q2))/4 - (q0*(P[1][10] + P[0][10]*SF[6] + P[2][10]*SF[5] + P[3][10]*SF[9] + P[11][10]*SPP[6] - P[12][10]*SPP[7] - (P[10][10]*q0)/2))/2;
+    nextP[1][2] = P[1][2] + SQ[5] + P[0][2]*SF[6] + P[2][2]*SF[5] + P[3][2]*SF[9] + P[11][2]*SPP[6] - P[12][2]*SPP[7] - (P[10][2]*q0)/2 + SF[4]*(P[1][0] + P[0][0]*SF[6] + P[2][0]*SF[5] + P[3][0]*SF[9] + P[11][0]*SPP[6] - P[12][0]*SPP[7] - (P[10][0]*q0)/2) + SF[8]*(P[1][1] + P[0][1]*SF[6] + P[2][1]*SF[5] + P[3][1]*SF[9] + P[11][1]*SPP[6] - P[12][1]*SPP[7] - (P[10][1]*q0)/2) + SF[6]*(P[1][3] + P[0][3]*SF[6] + P[2][3]*SF[5] + P[3][3]*SF[9] + P[11][3]*SPP[6] - P[12][3]*SPP[7] - (P[10][3]*q0)/2) + SF[11]*(P[1][12] + P[0][12]*SF[6] + P[2][12]*SF[5] + P[3][12]*SF[9] + P[11][12]*SPP[6] - P[12][12]*SPP[7] - (P[10][12]*q0)/2) - SPP[6]*(P[1][10] + P[0][10]*SF[6] + P[2][10]*SF[5] + P[3][10]*SF[9] + P[11][10]*SPP[6] - P[12][10]*SPP[7] - (P[10][10]*q0)/2) - (q0*(P[1][11] + P[0][11]*SF[6] + P[2][11]*SF[5] + P[3][11]*SF[9] + P[11][11]*SPP[6] - P[12][11]*SPP[7] - (P[10][11]*q0)/2))/2;
+    nextP[1][3] = P[1][3] + SQ[4] + P[0][3]*SF[6] + P[2][3]*SF[5] + P[3][3]*SF[9] + P[11][3]*SPP[6] - P[12][3]*SPP[7] - (P[10][3]*q0)/2 + SF[5]*(P[1][0] + P[0][0]*SF[6] + P[2][0]*SF[5] + P[3][0]*SF[9] + P[11][0]*SPP[6] - P[12][0]*SPP[7] - (P[10][0]*q0)/2) + SF[4]*(P[1][1] + P[0][1]*SF[6] + P[2][1]*SF[5] + P[3][1]*SF[9] + P[11][1]*SPP[6] - P[12][1]*SPP[7] - (P[10][1]*q0)/2) + SF[7]*(P[1][2] + P[0][2]*SF[6] + P[2][2]*SF[5] + P[3][2]*SF[9] + P[11][2]*SPP[6] - P[12][2]*SPP[7] - (P[10][2]*q0)/2) - SF[11]*(P[1][11] + P[0][11]*SF[6] + P[2][11]*SF[5] + P[3][11]*SF[9] + P[11][11]*SPP[6] - P[12][11]*SPP[7] - (P[10][11]*q0)/2) + SPP[7]*(P[1][10] + P[0][10]*SF[6] + P[2][10]*SF[5] + P[3][10]*SF[9] + P[11][10]*SPP[6] - P[12][10]*SPP[7] - (P[10][10]*q0)/2) - (q0*(P[1][12] + P[0][12]*SF[6] + P[2][12]*SF[5] + P[3][12]*SF[9] + P[11][12]*SPP[6] - P[12][12]*SPP[7] - (P[10][12]*q0)/2))/2;
+    nextP[1][4] = P[1][4] + P[0][4]*SF[6] + P[2][4]*SF[5] + P[3][4]*SF[9] + P[11][4]*SPP[6] - P[12][4]*SPP[7] - (P[10][4]*q0)/2 + SF[3]*(P[1][0] + P[0][0]*SF[6] + P[2][0]*SF[5] + P[3][0]*SF[9] + P[11][0]*SPP[6] - P[12][0]*SPP[7] - (P[10][0]*q0)/2) + SF[1]*(P[1][1] + P[0][1]*SF[6] + P[2][1]*SF[5] + P[3][1]*SF[9] + P[11][1]*SPP[6] - P[12][1]*SPP[7] - (P[10][1]*q0)/2) + SPP[0]*(P[1][2] + P[0][2]*SF[6] + P[2][2]*SF[5] + P[3][2]*SF[9] + P[11][2]*SPP[6] - P[12][2]*SPP[7] - (P[10][2]*q0)/2) - SPP[2]*(P[1][3] + P[0][3]*SF[6] + P[2][3]*SF[5] + P[3][3]*SF[9] + P[11][3]*SPP[6] - P[12][3]*SPP[7] - (P[10][3]*q0)/2) - SPP[4]*(P[1][13] + P[0][13]*SF[6] + P[2][13]*SF[5] + P[3][13]*SF[9] + P[11][13]*SPP[6] - P[12][13]*SPP[7] - (P[10][13]*q0)/2);
+    nextP[1][5] = P[1][5] + P[0][5]*SF[6] + P[2][5]*SF[5] + P[3][5]*SF[9] + P[11][5]*SPP[6] - P[12][5]*SPP[7] - (P[10][5]*q0)/2 + SF[2]*(P[1][0] + P[0][0]*SF[6] + P[2][0]*SF[5] + P[3][0]*SF[9] + P[11][0]*SPP[6] - P[12][0]*SPP[7] - (P[10][0]*q0)/2) + SF[1]*(P[1][2] + P[0][2]*SF[6] + P[2][2]*SF[5] + P[3][2]*SF[9] + P[11][2]*SPP[6] - P[12][2]*SPP[7] - (P[10][2]*q0)/2) + SF[3]*(P[1][3] + P[0][3]*SF[6] + P[2][3]*SF[5] + P[3][3]*SF[9] + P[11][3]*SPP[6] - P[12][3]*SPP[7] - (P[10][3]*q0)/2) - SPP[0]*(P[1][1] + P[0][1]*SF[6] + P[2][1]*SF[5] + P[3][1]*SF[9] + P[11][1]*SPP[6] - P[12][1]*SPP[7] - (P[10][1]*q0)/2) + SPP[3]*(P[1][13] + P[0][13]*SF[6] + P[2][13]*SF[5] + P[3][13]*SF[9] + P[11][13]*SPP[6] - P[12][13]*SPP[7] - (P[10][13]*q0)/2);
+    nextP[1][6] = P[1][6] + P[0][6]*SF[6] + P[2][6]*SF[5] + P[3][6]*SF[9] + P[11][6]*SPP[6] - P[12][6]*SPP[7] - (P[10][6]*q0)/2 + SF[2]*(P[1][1] + P[0][1]*SF[6] + P[2][1]*SF[5] + P[3][1]*SF[9] + P[11][1]*SPP[6] - P[12][1]*SPP[7] - (P[10][1]*q0)/2) + SF[1]*(P[1][3] + P[0][3]*SF[6] + P[2][3]*SF[5] + P[3][3]*SF[9] + P[11][3]*SPP[6] - P[12][3]*SPP[7] - (P[10][3]*q0)/2) + SPP[0]*(P[1][0] + P[0][0]*SF[6] + P[2][0]*SF[5] + P[3][0]*SF[9] + P[11][0]*SPP[6] - P[12][0]*SPP[7] - (P[10][0]*q0)/2) - SPP[1]*(P[1][2] + P[0][2]*SF[6] + P[2][2]*SF[5] + P[3][2]*SF[9] + P[11][2]*SPP[6] - P[12][2]*SPP[7] - (P[10][2]*q0)/2) - (sq(q0) - sq(q1) - sq(q2) + sq(q3))*(P[1][13] + P[0][13]*SF[6] + P[2][13]*SF[5] + P[3][13]*SF[9] + P[11][13]*SPP[6] - P[12][13]*SPP[7] - (P[10][13]*q0)/2);
+    nextP[1][7] = P[1][7] + P[0][7]*SF[6] + P[2][7]*SF[5] + P[3][7]*SF[9] + P[11][7]*SPP[6] - P[12][7]*SPP[7] - (P[10][7]*q0)/2 + dt*(P[1][4] + P[0][4]*SF[6] + P[2][4]*SF[5] + P[3][4]*SF[9] + P[11][4]*SPP[6] - P[12][4]*SPP[7] - (P[10][4]*q0)/2);
+    nextP[1][8] = P[1][8] + P[0][8]*SF[6] + P[2][8]*SF[5] + P[3][8]*SF[9] + P[11][8]*SPP[6] - P[12][8]*SPP[7] - (P[10][8]*q0)/2 + dt*(P[1][5] + P[0][5]*SF[6] + P[2][5]*SF[5] + P[3][5]*SF[9] + P[11][5]*SPP[6] - P[12][5]*SPP[7] - (P[10][5]*q0)/2);
+    nextP[1][9] = P[1][9] + P[0][9]*SF[6] + P[2][9]*SF[5] + P[3][9]*SF[9] + P[11][9]*SPP[6] - P[12][9]*SPP[7] - (P[10][9]*q0)/2 + dt*(P[1][6] + P[0][6]*SF[6] + P[2][6]*SF[5] + P[3][6]*SF[9] + P[11][6]*SPP[6] - P[12][6]*SPP[7] - (P[10][6]*q0)/2);
+    nextP[1][10] = P[1][10] + P[0][10]*SF[6] + P[2][10]*SF[5] + P[3][10]*SF[9] + P[11][10]*SPP[6] - P[12][10]*SPP[7] - (P[10][10]*q0)/2;
+    nextP[1][11] = P[1][11] + P[0][11]*SF[6] + P[2][11]*SF[5] + P[3][11]*SF[9] + P[11][11]*SPP[6] - P[12][11]*SPP[7] - (P[10][11]*q0)/2;
+    nextP[1][12] = P[1][12] + P[0][12]*SF[6] + P[2][12]*SF[5] + P[3][12]*SF[9] + P[11][12]*SPP[6] - P[12][12]*SPP[7] - (P[10][12]*q0)/2;
+    nextP[1][13] = P[1][13] + P[0][13]*SF[6] + P[2][13]*SF[5] + P[3][13]*SF[9] + P[11][13]*SPP[6] - P[12][13]*SPP[7] - (P[10][13]*q0)/2;
+    nextP[1][14] = P[1][14] + P[0][14]*SF[6] + P[2][14]*SF[5] + P[3][14]*SF[9] + P[11][14]*SPP[6] - P[12][14]*SPP[7] - (P[10][14]*q0)/2;
+    nextP[1][15] = P[1][15] + P[0][15]*SF[6] + P[2][15]*SF[5] + P[3][15]*SF[9] + P[11][15]*SPP[6] - P[12][15]*SPP[7] - (P[10][15]*q0)/2;
+    nextP[1][16] = P[1][16] + P[0][16]*SF[6] + P[2][16]*SF[5] + P[3][16]*SF[9] + P[11][16]*SPP[6] - P[12][16]*SPP[7] - (P[10][16]*q0)/2;
+    nextP[1][17] = P[1][17] + P[0][17]*SF[6] + P[2][17]*SF[5] + P[3][17]*SF[9] + P[11][17]*SPP[6] - P[12][17]*SPP[7] - (P[10][17]*q0)/2;
+    nextP[1][18] = P[1][18] + P[0][18]*SF[6] + P[2][18]*SF[5] + P[3][18]*SF[9] + P[11][18]*SPP[6] - P[12][18]*SPP[7] - (P[10][18]*q0)/2;
+    nextP[1][19] = P[1][19] + P[0][19]*SF[6] + P[2][19]*SF[5] + P[3][19]*SF[9] + P[11][19]*SPP[6] - P[12][19]*SPP[7] - (P[10][19]*q0)/2;
+    nextP[1][20] = P[1][20] + P[0][20]*SF[6] + P[2][20]*SF[5] + P[3][20]*SF[9] + P[11][20]*SPP[6] - P[12][20]*SPP[7] - (P[10][20]*q0)/2;
+    nextP[1][21] = P[1][21] + P[0][21]*SF[6] + P[2][21]*SF[5] + P[3][21]*SF[9] + P[11][21]*SPP[6] - P[12][21]*SPP[7] - (P[10][21]*q0)/2;
+    nextP[1][22] = P[1][22] + P[0][22]*SF[6] + P[2][22]*SF[5] + P[3][22]*SF[9] + P[11][22]*SPP[6] - P[12][22]*SPP[7] - (P[10][22]*q0)/2;
+    nextP[2][0] = P[2][0] + SQ[7] + P[0][0]*SF[4] + P[1][0]*SF[8] + P[3][0]*SF[6] + P[12][0]*SF[11] - P[10][0]*SPP[6] - (P[11][0]*q0)/2 + SF[7]*(P[2][1] + P[0][1]*SF[4] + P[1][1]*SF[8] + P[3][1]*SF[6] + P[12][1]*SF[11] - P[10][1]*SPP[6] - (P[11][1]*q0)/2) + SF[9]*(P[2][2] + P[0][2]*SF[4] + P[1][2]*SF[8] + P[3][2]*SF[6] + P[12][2]*SF[11] - P[10][2]*SPP[6] - (P[11][2]*q0)/2) + SF[8]*(P[2][3] + P[0][3]*SF[4] + P[1][3]*SF[8] + P[3][3]*SF[6] + P[12][3]*SF[11] - P[10][3]*SPP[6] - (P[11][3]*q0)/2) + SF[11]*(P[2][10] + P[0][10]*SF[4] + P[1][10]*SF[8] + P[3][10]*SF[6] + P[12][10]*SF[11] - P[10][10]*SPP[6] - (P[11][10]*q0)/2) + SPP[7]*(P[2][11] + P[0][11]*SF[4] + P[1][11]*SF[8] + P[3][11]*SF[6] + P[12][11]*SF[11] - P[10][11]*SPP[6] - (P[11][11]*q0)/2) + SPP[6]*(P[2][12] + P[0][12]*SF[4] + P[1][12]*SF[8] + P[3][12]*SF[6] + P[12][12]*SF[11] - P[10][12]*SPP[6] - (P[11][12]*q0)/2);
+    nextP[2][1] = P[2][1] + SQ[5] + P[0][1]*SF[4] + P[1][1]*SF[8] + P[3][1]*SF[6] + P[12][1]*SF[11] - P[10][1]*SPP[6] - (P[11][1]*q0)/2 + SF[6]*(P[2][0] + P[0][0]*SF[4] + P[1][0]*SF[8] + P[3][0]*SF[6] + P[12][0]*SF[11] - P[10][0]*SPP[6] - (P[11][0]*q0)/2) + SF[5]*(P[2][2] + P[0][2]*SF[4] + P[1][2]*SF[8] + P[3][2]*SF[6] + P[12][2]*SF[11] - P[10][2]*SPP[6] - (P[11][2]*q0)/2) + SF[9]*(P[2][3] + P[0][3]*SF[4] + P[1][3]*SF[8] + P[3][3]*SF[6] + P[12][3]*SF[11] - P[10][3]*SPP[6] - (P[11][3]*q0)/2) + SPP[6]*(P[2][11] + P[0][11]*SF[4] + P[1][11]*SF[8] + P[3][11]*SF[6] + P[12][11]*SF[11] - P[10][11]*SPP[6] - (P[11][11]*q0)/2) - SPP[7]*(P[2][12] + P[0][12]*SF[4] + P[1][12]*SF[8] + P[3][12]*SF[6] + P[12][12]*SF[11] - P[10][12]*SPP[6] - (P[11][12]*q0)/2) - (q0*(P[2][10] + P[0][10]*SF[4] + P[1][10]*SF[8] + P[3][10]*SF[6] + P[12][10]*SF[11] - P[10][10]*SPP[6] - (P[11][10]*q0)/2))/2;
+    nextP[2][2] = P[2][2] + P[0][2]*SF[4] + P[1][2]*SF[8] + P[3][2]*SF[6] + P[12][2]*SF[11] - P[10][2]*SPP[6] + dayCov*SQ[9] + (dazCov*SQ[10])/4 - (P[11][2]*q0)/2 + SF[4]*(P[2][0] + P[0][0]*SF[4] + P[1][0]*SF[8] + P[3][0]*SF[6] + P[12][0]*SF[11] - P[10][0]*SPP[6] - (P[11][0]*q0)/2) + SF[8]*(P[2][1] + P[0][1]*SF[4] + P[1][1]*SF[8] + P[3][1]*SF[6] + P[12][1]*SF[11] - P[10][1]*SPP[6] - (P[11][1]*q0)/2) + SF[6]*(P[2][3] + P[0][3]*SF[4] + P[1][3]*SF[8] + P[3][3]*SF[6] + P[12][3]*SF[11] - P[10][3]*SPP[6] - (P[11][3]*q0)/2) + SF[11]*(P[2][12] + P[0][12]*SF[4] + P[1][12]*SF[8] + P[3][12]*SF[6] + P[12][12]*SF[11] - P[10][12]*SPP[6] - (P[11][12]*q0)/2) - SPP[6]*(P[2][10] + P[0][10]*SF[4] + P[1][10]*SF[8] + P[3][10]*SF[6] + P[12][10]*SF[11] - P[10][10]*SPP[6] - (P[11][10]*q0)/2) + (daxCov*sq(q3))/4 - (q0*(P[2][11] + P[0][11]*SF[4] + P[1][11]*SF[8] + P[3][11]*SF[6] + P[12][11]*SF[11] - P[10][11]*SPP[6] - (P[11][11]*q0)/2))/2;
+    nextP[2][3] = P[2][3] + SQ[3] + P[0][3]*SF[4] + P[1][3]*SF[8] + P[3][3]*SF[6] + P[12][3]*SF[11] - P[10][3]*SPP[6] - (P[11][3]*q0)/2 + SF[5]*(P[2][0] + P[0][0]*SF[4] + P[1][0]*SF[8] + P[3][0]*SF[6] + P[12][0]*SF[11] - P[10][0]*SPP[6] - (P[11][0]*q0)/2) + SF[4]*(P[2][1] + P[0][1]*SF[4] + P[1][1]*SF[8] + P[3][1]*SF[6] + P[12][1]*SF[11] - P[10][1]*SPP[6] - (P[11][1]*q0)/2) + SF[7]*(P[2][2] + P[0][2]*SF[4] + P[1][2]*SF[8] + P[3][2]*SF[6] + P[12][2]*SF[11] - P[10][2]*SPP[6] - (P[11][2]*q0)/2) - SF[11]*(P[2][11] + P[0][11]*SF[4] + P[1][11]*SF[8] + P[3][11]*SF[6] + P[12][11]*SF[11] - P[10][11]*SPP[6] - (P[11][11]*q0)/2) + SPP[7]*(P[2][10] + P[0][10]*SF[4] + P[1][10]*SF[8] + P[3][10]*SF[6] + P[12][10]*SF[11] - P[10][10]*SPP[6] - (P[11][10]*q0)/2) - (q0*(P[2][12] + P[0][12]*SF[4] + P[1][12]*SF[8] + P[3][12]*SF[6] + P[12][12]*SF[11] - P[10][12]*SPP[6] - (P[11][12]*q0)/2))/2;
+    nextP[2][4] = P[2][4] + P[0][4]*SF[4] + P[1][4]*SF[8] + P[3][4]*SF[6] + P[12][4]*SF[11] - P[10][4]*SPP[6] - (P[11][4]*q0)/2 + SF[3]*(P[2][0] + P[0][0]*SF[4] + P[1][0]*SF[8] + P[3][0]*SF[6] + P[12][0]*SF[11] - P[10][0]*SPP[6] - (P[11][0]*q0)/2) + SF[1]*(P[2][1] + P[0][1]*SF[4] + P[1][1]*SF[8] + P[3][1]*SF[6] + P[12][1]*SF[11] - P[10][1]*SPP[6] - (P[11][1]*q0)/2) + SPP[0]*(P[2][2] + P[0][2]*SF[4] + P[1][2]*SF[8] + P[3][2]*SF[6] + P[12][2]*SF[11] - P[10][2]*SPP[6] - (P[11][2]*q0)/2) - SPP[2]*(P[2][3] + P[0][3]*SF[4] + P[1][3]*SF[8] + P[3][3]*SF[6] + P[12][3]*SF[11] - P[10][3]*SPP[6] - (P[11][3]*q0)/2) - SPP[4]*(P[2][13] + P[0][13]*SF[4] + P[1][13]*SF[8] + P[3][13]*SF[6] + P[12][13]*SF[11] - P[10][13]*SPP[6] - (P[11][13]*q0)/2);
+    nextP[2][5] = P[2][5] + P[0][5]*SF[4] + P[1][5]*SF[8] + P[3][5]*SF[6] + P[12][5]*SF[11] - P[10][5]*SPP[6] - (P[11][5]*q0)/2 + SF[2]*(P[2][0] + P[0][0]*SF[4] + P[1][0]*SF[8] + P[3][0]*SF[6] + P[12][0]*SF[11] - P[10][0]*SPP[6] - (P[11][0]*q0)/2) + SF[1]*(P[2][2] + P[0][2]*SF[4] + P[1][2]*SF[8] + P[3][2]*SF[6] + P[12][2]*SF[11] - P[10][2]*SPP[6] - (P[11][2]*q0)/2) + SF[3]*(P[2][3] + P[0][3]*SF[4] + P[1][3]*SF[8] + P[3][3]*SF[6] + P[12][3]*SF[11] - P[10][3]*SPP[6] - (P[11][3]*q0)/2) - SPP[0]*(P[2][1] + P[0][1]*SF[4] + P[1][1]*SF[8] + P[3][1]*SF[6] + P[12][1]*SF[11] - P[10][1]*SPP[6] - (P[11][1]*q0)/2) + SPP[3]*(P[2][13] + P[0][13]*SF[4] + P[1][13]*SF[8] + P[3][13]*SF[6] + P[12][13]*SF[11] - P[10][13]*SPP[6] - (P[11][13]*q0)/2);
+    nextP[2][6] = P[2][6] + P[0][6]*SF[4] + P[1][6]*SF[8] + P[3][6]*SF[6] + P[12][6]*SF[11] - P[10][6]*SPP[6] - (P[11][6]*q0)/2 + SF[2]*(P[2][1] + P[0][1]*SF[4] + P[1][1]*SF[8] + P[3][1]*SF[6] + P[12][1]*SF[11] - P[10][1]*SPP[6] - (P[11][1]*q0)/2) + SF[1]*(P[2][3] + P[0][3]*SF[4] + P[1][3]*SF[8] + P[3][3]*SF[6] + P[12][3]*SF[11] - P[10][3]*SPP[6] - (P[11][3]*q0)/2) + SPP[0]*(P[2][0] + P[0][0]*SF[4] + P[1][0]*SF[8] + P[3][0]*SF[6] + P[12][0]*SF[11] - P[10][0]*SPP[6] - (P[11][0]*q0)/2) - SPP[1]*(P[2][2] + P[0][2]*SF[4] + P[1][2]*SF[8] + P[3][2]*SF[6] + P[12][2]*SF[11] - P[10][2]*SPP[6] - (P[11][2]*q0)/2) - (sq(q0) - sq(q1) - sq(q2) + sq(q3))*(P[2][13] + P[0][13]*SF[4] + P[1][13]*SF[8] + P[3][13]*SF[6] + P[12][13]*SF[11] - P[10][13]*SPP[6] - (P[11][13]*q0)/2);
+    nextP[2][7] = P[2][7] + P[0][7]*SF[4] + P[1][7]*SF[8] + P[3][7]*SF[6] + P[12][7]*SF[11] - P[10][7]*SPP[6] - (P[11][7]*q0)/2 + dt*(P[2][4] + P[0][4]*SF[4] + P[1][4]*SF[8] + P[3][4]*SF[6] + P[12][4]*SF[11] - P[10][4]*SPP[6] - (P[11][4]*q0)/2);
+    nextP[2][8] = P[2][8] + P[0][8]*SF[4] + P[1][8]*SF[8] + P[3][8]*SF[6] + P[12][8]*SF[11] - P[10][8]*SPP[6] - (P[11][8]*q0)/2 + dt*(P[2][5] + P[0][5]*SF[4] + P[1][5]*SF[8] + P[3][5]*SF[6] + P[12][5]*SF[11] - P[10][5]*SPP[6] - (P[11][5]*q0)/2);
+    nextP[2][9] = P[2][9] + P[0][9]*SF[4] + P[1][9]*SF[8] + P[3][9]*SF[6] + P[12][9]*SF[11] - P[10][9]*SPP[6] - (P[11][9]*q0)/2 + dt*(P[2][6] + P[0][6]*SF[4] + P[1][6]*SF[8] + P[3][6]*SF[6] + P[12][6]*SF[11] - P[10][6]*SPP[6] - (P[11][6]*q0)/2);
+    nextP[2][10] = P[2][10] + P[0][10]*SF[4] + P[1][10]*SF[8] + P[3][10]*SF[6] + P[12][10]*SF[11] - P[10][10]*SPP[6] - (P[11][10]*q0)/2;
+    nextP[2][11] = P[2][11] + P[0][11]*SF[4] + P[1][11]*SF[8] + P[3][11]*SF[6] + P[12][11]*SF[11] - P[10][11]*SPP[6] - (P[11][11]*q0)/2;
+    nextP[2][12] = P[2][12] + P[0][12]*SF[4] + P[1][12]*SF[8] + P[3][12]*SF[6] + P[12][12]*SF[11] - P[10][12]*SPP[6] - (P[11][12]*q0)/2;
+    nextP[2][13] = P[2][13] + P[0][13]*SF[4] + P[1][13]*SF[8] + P[3][13]*SF[6] + P[12][13]*SF[11] - P[10][13]*SPP[6] - (P[11][13]*q0)/2;
+    nextP[2][14] = P[2][14] + P[0][14]*SF[4] + P[1][14]*SF[8] + P[3][14]*SF[6] + P[12][14]*SF[11] - P[10][14]*SPP[6] - (P[11][14]*q0)/2;
+    nextP[2][15] = P[2][15] + P[0][15]*SF[4] + P[1][15]*SF[8] + P[3][15]*SF[6] + P[12][15]*SF[11] - P[10][15]*SPP[6] - (P[11][15]*q0)/2;
+    nextP[2][16] = P[2][16] + P[0][16]*SF[4] + P[1][16]*SF[8] + P[3][16]*SF[6] + P[12][16]*SF[11] - P[10][16]*SPP[6] - (P[11][16]*q0)/2;
+    nextP[2][17] = P[2][17] + P[0][17]*SF[4] + P[1][17]*SF[8] + P[3][17]*SF[6] + P[12][17]*SF[11] - P[10][17]*SPP[6] - (P[11][17]*q0)/2;
+    nextP[2][18] = P[2][18] + P[0][18]*SF[4] + P[1][18]*SF[8] + P[3][18]*SF[6] + P[12][18]*SF[11] - P[10][18]*SPP[6] - (P[11][18]*q0)/2;
+    nextP[2][19] = P[2][19] + P[0][19]*SF[4] + P[1][19]*SF[8] + P[3][19]*SF[6] + P[12][19]*SF[11] - P[10][19]*SPP[6] - (P[11][19]*q0)/2;
+    nextP[2][20] = P[2][20] + P[0][20]*SF[4] + P[1][20]*SF[8] + P[3][20]*SF[6] + P[12][20]*SF[11] - P[10][20]*SPP[6] - (P[11][20]*q0)/2;
+    nextP[2][21] = P[2][21] + P[0][21]*SF[4] + P[1][21]*SF[8] + P[3][21]*SF[6] + P[12][21]*SF[11] - P[10][21]*SPP[6] - (P[11][21]*q0)/2;
+    nextP[2][22] = P[2][22] + P[0][22]*SF[4] + P[1][22]*SF[8] + P[3][22]*SF[6] + P[12][22]*SF[11] - P[10][22]*SPP[6] - (P[11][22]*q0)/2;
+    nextP[3][0] = P[3][0] + SQ[6] + P[0][0]*SF[5] + P[1][0]*SF[4] + P[2][0]*SF[7] - P[11][0]*SF[11] + P[10][0]*SPP[7] - (P[12][0]*q0)/2 + SF[7]*(P[3][1] + P[0][1]*SF[5] + P[1][1]*SF[4] + P[2][1]*SF[7] - P[11][1]*SF[11] + P[10][1]*SPP[7] - (P[12][1]*q0)/2) + SF[9]*(P[3][2] + P[0][2]*SF[5] + P[1][2]*SF[4] + P[2][2]*SF[7] - P[11][2]*SF[11] + P[10][2]*SPP[7] - (P[12][2]*q0)/2) + SF[8]*(P[3][3] + P[0][3]*SF[5] + P[1][3]*SF[4] + P[2][3]*SF[7] - P[11][3]*SF[11] + P[10][3]*SPP[7] - (P[12][3]*q0)/2) + SF[11]*(P[3][10] + P[0][10]*SF[5] + P[1][10]*SF[4] + P[2][10]*SF[7] - P[11][10]*SF[11] + P[10][10]*SPP[7] - (P[12][10]*q0)/2) + SPP[7]*(P[3][11] + P[0][11]*SF[5] + P[1][11]*SF[4] + P[2][11]*SF[7] - P[11][11]*SF[11] + P[10][11]*SPP[7] - (P[12][11]*q0)/2) + SPP[6]*(P[3][12] + P[0][12]*SF[5] + P[1][12]*SF[4] + P[2][12]*SF[7] - P[11][12]*SF[11] + P[10][12]*SPP[7] - (P[12][12]*q0)/2);
+    nextP[3][1] = P[3][1] + SQ[4] + P[0][1]*SF[5] + P[1][1]*SF[4] + P[2][1]*SF[7] - P[11][1]*SF[11] + P[10][1]*SPP[7] - (P[12][1]*q0)/2 + SF[6]*(P[3][0] + P[0][0]*SF[5] + P[1][0]*SF[4] + P[2][0]*SF[7] - P[11][0]*SF[11] + P[10][0]*SPP[7] - (P[12][0]*q0)/2) + SF[5]*(P[3][2] + P[0][2]*SF[5] + P[1][2]*SF[4] + P[2][2]*SF[7] - P[11][2]*SF[11] + P[10][2]*SPP[7] - (P[12][2]*q0)/2) + SF[9]*(P[3][3] + P[0][3]*SF[5] + P[1][3]*SF[4] + P[2][3]*SF[7] - P[11][3]*SF[11] + P[10][3]*SPP[7] - (P[12][3]*q0)/2) + SPP[6]*(P[3][11] + P[0][11]*SF[5] + P[1][11]*SF[4] + P[2][11]*SF[7] - P[11][11]*SF[11] + P[10][11]*SPP[7] - (P[12][11]*q0)/2) - SPP[7]*(P[3][12] + P[0][12]*SF[5] + P[1][12]*SF[4] + P[2][12]*SF[7] - P[11][12]*SF[11] + P[10][12]*SPP[7] - (P[12][12]*q0)/2) - (q0*(P[3][10] + P[0][10]*SF[5] + P[1][10]*SF[4] + P[2][10]*SF[7] - P[11][10]*SF[11] + P[10][10]*SPP[7] - (P[12][10]*q0)/2))/2;
+    nextP[3][2] = P[3][2] + SQ[3] + P[0][2]*SF[5] + P[1][2]*SF[4] + P[2][2]*SF[7] - P[11][2]*SF[11] + P[10][2]*SPP[7] - (P[12][2]*q0)/2 + SF[4]*(P[3][0] + P[0][0]*SF[5] + P[1][0]*SF[4] + P[2][0]*SF[7] - P[11][0]*SF[11] + P[10][0]*SPP[7] - (P[12][0]*q0)/2) + SF[8]*(P[3][1] + P[0][1]*SF[5] + P[1][1]*SF[4] + P[2][1]*SF[7] - P[11][1]*SF[11] + P[10][1]*SPP[7] - (P[12][1]*q0)/2) + SF[6]*(P[3][3] + P[0][3]*SF[5] + P[1][3]*SF[4] + P[2][3]*SF[7] - P[11][3]*SF[11] + P[10][3]*SPP[7] - (P[12][3]*q0)/2) + SF[11]*(P[3][12] + P[0][12]*SF[5] + P[1][12]*SF[4] + P[2][12]*SF[7] - P[11][12]*SF[11] + P[10][12]*SPP[7] - (P[12][12]*q0)/2) - SPP[6]*(P[3][10] + P[0][10]*SF[5] + P[1][10]*SF[4] + P[2][10]*SF[7] - P[11][10]*SF[11] + P[10][10]*SPP[7] - (P[12][10]*q0)/2) - (q0*(P[3][11] + P[0][11]*SF[5] + P[1][11]*SF[4] + P[2][11]*SF[7] - P[11][11]*SF[11] + P[10][11]*SPP[7] - (P[12][11]*q0)/2))/2;
+    nextP[3][3] = P[3][3] + P[0][3]*SF[5] + P[1][3]*SF[4] + P[2][3]*SF[7] - P[11][3]*SF[11] + P[10][3]*SPP[7] + (dayCov*SQ[10])/4 + dazCov*SQ[9] - (P[12][3]*q0)/2 + SF[5]*(P[3][0] + P[0][0]*SF[5] + P[1][0]*SF[4] + P[2][0]*SF[7] - P[11][0]*SF[11] + P[10][0]*SPP[7] - (P[12][0]*q0)/2) + SF[4]*(P[3][1] + P[0][1]*SF[5] + P[1][1]*SF[4] + P[2][1]*SF[7] - P[11][1]*SF[11] + P[10][1]*SPP[7] - (P[12][1]*q0)/2) + SF[7]*(P[3][2] + P[0][2]*SF[5] + P[1][2]*SF[4] + P[2][2]*SF[7] - P[11][2]*SF[11] + P[10][2]*SPP[7] - (P[12][2]*q0)/2) - SF[11]*(P[3][11] + P[0][11]*SF[5] + P[1][11]*SF[4] + P[2][11]*SF[7] - P[11][11]*SF[11] + P[10][11]*SPP[7] - (P[12][11]*q0)/2) + SPP[7]*(P[3][10] + P[0][10]*SF[5] + P[1][10]*SF[4] + P[2][10]*SF[7] - P[11][10]*SF[11] + P[10][10]*SPP[7] - (P[12][10]*q0)/2) + (daxCov*sq(q2))/4 - (q0*(P[3][12] + P[0][12]*SF[5] + P[1][12]*SF[4] + P[2][12]*SF[7] - P[11][12]*SF[11] + P[10][12]*SPP[7] - (P[12][12]*q0)/2))/2;
+    nextP[3][4] = P[3][4] + P[0][4]*SF[5] + P[1][4]*SF[4] + P[2][4]*SF[7] - P[11][4]*SF[11] + P[10][4]*SPP[7] - (P[12][4]*q0)/2 + SF[3]*(P[3][0] + P[0][0]*SF[5] + P[1][0]*SF[4] + P[2][0]*SF[7] - P[11][0]*SF[11] + P[10][0]*SPP[7] - (P[12][0]*q0)/2) + SF[1]*(P[3][1] + P[0][1]*SF[5] + P[1][1]*SF[4] + P[2][1]*SF[7] - P[11][1]*SF[11] + P[10][1]*SPP[7] - (P[12][1]*q0)/2) + SPP[0]*(P[3][2] + P[0][2]*SF[5] + P[1][2]*SF[4] + P[2][2]*SF[7] - P[11][2]*SF[11] + P[10][2]*SPP[7] - (P[12][2]*q0)/2) - SPP[2]*(P[3][3] + P[0][3]*SF[5] + P[1][3]*SF[4] + P[2][3]*SF[7] - P[11][3]*SF[11] + P[10][3]*SPP[7] - (P[12][3]*q0)/2) - SPP[4]*(P[3][13] + P[0][13]*SF[5] + P[1][13]*SF[4] + P[2][13]*SF[7] - P[11][13]*SF[11] + P[10][13]*SPP[7] - (P[12][13]*q0)/2);
+    nextP[3][5] = P[3][5] + P[0][5]*SF[5] + P[1][5]*SF[4] + P[2][5]*SF[7] - P[11][5]*SF[11] + P[10][5]*SPP[7] - (P[12][5]*q0)/2 + SF[2]*(P[3][0] + P[0][0]*SF[5] + P[1][0]*SF[4] + P[2][0]*SF[7] - P[11][0]*SF[11] + P[10][0]*SPP[7] - (P[12][0]*q0)/2) + SF[1]*(P[3][2] + P[0][2]*SF[5] + P[1][2]*SF[4] + P[2][2]*SF[7] - P[11][2]*SF[11] + P[10][2]*SPP[7] - (P[12][2]*q0)/2) + SF[3]*(P[3][3] + P[0][3]*SF[5] + P[1][3]*SF[4] + P[2][3]*SF[7] - P[11][3]*SF[11] + P[10][3]*SPP[7] - (P[12][3]*q0)/2) - SPP[0]*(P[3][1] + P[0][1]*SF[5] + P[1][1]*SF[4] + P[2][1]*SF[7] - P[11][1]*SF[11] + P[10][1]*SPP[7] - (P[12][1]*q0)/2) + SPP[3]*(P[3][13] + P[0][13]*SF[5] + P[1][13]*SF[4] + P[2][13]*SF[7] - P[11][13]*SF[11] + P[10][13]*SPP[7] - (P[12][13]*q0)/2);
+    nextP[3][6] = P[3][6] + P[0][6]*SF[5] + P[1][6]*SF[4] + P[2][6]*SF[7] - P[11][6]*SF[11] + P[10][6]*SPP[7] - (P[12][6]*q0)/2 + SF[2]*(P[3][1] + P[0][1]*SF[5] + P[1][1]*SF[4] + P[2][1]*SF[7] - P[11][1]*SF[11] + P[10][1]*SPP[7] - (P[12][1]*q0)/2) + SF[1]*(P[3][3] + P[0][3]*SF[5] + P[1][3]*SF[4] + P[2][3]*SF[7] - P[11][3]*SF[11] + P[10][3]*SPP[7] - (P[12][3]*q0)/2) + SPP[0]*(P[3][0] + P[0][0]*SF[5] + P[1][0]*SF[4] + P[2][0]*SF[7] - P[11][0]*SF[11] + P[10][0]*SPP[7] - (P[12][0]*q0)/2) - SPP[1]*(P[3][2] + P[0][2]*SF[5] + P[1][2]*SF[4] + P[2][2]*SF[7] - P[11][2]*SF[11] + P[10][2]*SPP[7] - (P[12][2]*q0)/2) - (sq(q0) - sq(q1) - sq(q2) + sq(q3))*(P[3][13] + P[0][13]*SF[5] + P[1][13]*SF[4] + P[2][13]*SF[7] - P[11][13]*SF[11] + P[10][13]*SPP[7] - (P[12][13]*q0)/2);
+    nextP[3][7] = P[3][7] + P[0][7]*SF[5] + P[1][7]*SF[4] + P[2][7]*SF[7] - P[11][7]*SF[11] + P[10][7]*SPP[7] - (P[12][7]*q0)/2 + dt*(P[3][4] + P[0][4]*SF[5] + P[1][4]*SF[4] + P[2][4]*SF[7] - P[11][4]*SF[11] + P[10][4]*SPP[7] - (P[12][4]*q0)/2);
+    nextP[3][8] = P[3][8] + P[0][8]*SF[5] + P[1][8]*SF[4] + P[2][8]*SF[7] - P[11][8]*SF[11] + P[10][8]*SPP[7] - (P[12][8]*q0)/2 + dt*(P[3][5] + P[0][5]*SF[5] + P[1][5]*SF[4] + P[2][5]*SF[7] - P[11][5]*SF[11] + P[10][5]*SPP[7] - (P[12][5]*q0)/2);
+    nextP[3][9] = P[3][9] + P[0][9]*SF[5] + P[1][9]*SF[4] + P[2][9]*SF[7] - P[11][9]*SF[11] + P[10][9]*SPP[7] - (P[12][9]*q0)/2 + dt*(P[3][6] + P[0][6]*SF[5] + P[1][6]*SF[4] + P[2][6]*SF[7] - P[11][6]*SF[11] + P[10][6]*SPP[7] - (P[12][6]*q0)/2);
+    nextP[3][10] = P[3][10] + P[0][10]*SF[5] + P[1][10]*SF[4] + P[2][10]*SF[7] - P[11][10]*SF[11] + P[10][10]*SPP[7] - (P[12][10]*q0)/2;
+    nextP[3][11] = P[3][11] + P[0][11]*SF[5] + P[1][11]*SF[4] + P[2][11]*SF[7] - P[11][11]*SF[11] + P[10][11]*SPP[7] - (P[12][11]*q0)/2;
+    nextP[3][12] = P[3][12] + P[0][12]*SF[5] + P[1][12]*SF[4] + P[2][12]*SF[7] - P[11][12]*SF[11] + P[10][12]*SPP[7] - (P[12][12]*q0)/2;
+    nextP[3][13] = P[3][13] + P[0][13]*SF[5] + P[1][13]*SF[4] + P[2][13]*SF[7] - P[11][13]*SF[11] + P[10][13]*SPP[7] - (P[12][13]*q0)/2;
+    nextP[3][14] = P[3][14] + P[0][14]*SF[5] + P[1][14]*SF[4] + P[2][14]*SF[7] - P[11][14]*SF[11] + P[10][14]*SPP[7] - (P[12][14]*q0)/2;
+    nextP[3][15] = P[3][15] + P[0][15]*SF[5] + P[1][15]*SF[4] + P[2][15]*SF[7] - P[11][15]*SF[11] + P[10][15]*SPP[7] - (P[12][15]*q0)/2;
+    nextP[3][16] = P[3][16] + P[0][16]*SF[5] + P[1][16]*SF[4] + P[2][16]*SF[7] - P[11][16]*SF[11] + P[10][16]*SPP[7] - (P[12][16]*q0)/2;
+    nextP[3][17] = P[3][17] + P[0][17]*SF[5] + P[1][17]*SF[4] + P[2][17]*SF[7] - P[11][17]*SF[11] + P[10][17]*SPP[7] - (P[12][17]*q0)/2;
+    nextP[3][18] = P[3][18] + P[0][18]*SF[5] + P[1][18]*SF[4] + P[2][18]*SF[7] - P[11][18]*SF[11] + P[10][18]*SPP[7] - (P[12][18]*q0)/2;
+    nextP[3][19] = P[3][19] + P[0][19]*SF[5] + P[1][19]*SF[4] + P[2][19]*SF[7] - P[11][19]*SF[11] + P[10][19]*SPP[7] - (P[12][19]*q0)/2;
+    nextP[3][20] = P[3][20] + P[0][20]*SF[5] + P[1][20]*SF[4] + P[2][20]*SF[7] - P[11][20]*SF[11] + P[10][20]*SPP[7] - (P[12][20]*q0)/2;
+    nextP[3][21] = P[3][21] + P[0][21]*SF[5] + P[1][21]*SF[4] + P[2][21]*SF[7] - P[11][21]*SF[11] + P[10][21]*SPP[7] - (P[12][21]*q0)/2;
+    nextP[3][22] = P[3][22] + P[0][22]*SF[5] + P[1][22]*SF[4] + P[2][22]*SF[7] - P[11][22]*SF[11] + P[10][22]*SPP[7] - (P[12][22]*q0)/2;
+    nextP[4][0] = P[4][0] + P[0][0]*SF[3] + P[1][0]*SF[1] + P[2][0]*SPP[0] - P[3][0]*SPP[2] - P[13][0]*SPP[4] + SF[7]*(P[4][1] + P[0][1]*SF[3] + P[1][1]*SF[1] + P[2][1]*SPP[0] - P[3][1]*SPP[2] - P[13][1]*SPP[4]) + SF[9]*(P[4][2] + P[0][2]*SF[3] + P[1][2]*SF[1] + P[2][2]*SPP[0] - P[3][2]*SPP[2] - P[13][2]*SPP[4]) + SF[8]*(P[4][3] + P[0][3]*SF[3] + P[1][3]*SF[1] + P[2][3]*SPP[0] - P[3][3]*SPP[2] - P[13][3]*SPP[4]) + SF[11]*(P[4][10] + P[0][10]*SF[3] + P[1][10]*SF[1] + P[2][10]*SPP[0] - P[3][10]*SPP[2] - P[13][10]*SPP[4]) + SPP[7]*(P[4][11] + P[0][11]*SF[3] + P[1][11]*SF[1] + P[2][11]*SPP[0] - P[3][11]*SPP[2] - P[13][11]*SPP[4]) + SPP[6]*(P[4][12] + P[0][12]*SF[3] + P[1][12]*SF[1] + P[2][12]*SPP[0] - P[3][12]*SPP[2] - P[13][12]*SPP[4]);
+    nextP[4][1] = P[4][1] + P[0][1]*SF[3] + P[1][1]*SF[1] + P[2][1]*SPP[0] - P[3][1]*SPP[2] - P[13][1]*SPP[4] + SF[6]*(P[4][0] + P[0][0]*SF[3] + P[1][0]*SF[1] + P[2][0]*SPP[0] - P[3][0]*SPP[2] - P[13][0]*SPP[4]) + SF[5]*(P[4][2] + P[0][2]*SF[3] + P[1][2]*SF[1] + P[2][2]*SPP[0] - P[3][2]*SPP[2] - P[13][2]*SPP[4]) + SF[9]*(P[4][3] + P[0][3]*SF[3] + P[1][3]*SF[1] + P[2][3]*SPP[0] - P[3][3]*SPP[2] - P[13][3]*SPP[4]) + SPP[6]*(P[4][11] + P[0][11]*SF[3] + P[1][11]*SF[1] + P[2][11]*SPP[0] - P[3][11]*SPP[2] - P[13][11]*SPP[4]) - SPP[7]*(P[4][12] + P[0][12]*SF[3] + P[1][12]*SF[1] + P[2][12]*SPP[0] - P[3][12]*SPP[2] - P[13][12]*SPP[4]) - (q0*(P[4][10] + P[0][10]*SF[3] + P[1][10]*SF[1] + P[2][10]*SPP[0] - P[3][10]*SPP[2] - P[13][10]*SPP[4]))/2;
+    nextP[4][2] = P[4][2] + P[0][2]*SF[3] + P[1][2]*SF[1] + P[2][2]*SPP[0] - P[3][2]*SPP[2] - P[13][2]*SPP[4] + SF[4]*(P[4][0] + P[0][0]*SF[3] + P[1][0]*SF[1] + P[2][0]*SPP[0] - P[3][0]*SPP[2] - P[13][0]*SPP[4]) + SF[8]*(P[4][1] + P[0][1]*SF[3] + P[1][1]*SF[1] + P[2][1]*SPP[0] - P[3][1]*SPP[2] - P[13][1]*SPP[4]) + SF[6]*(P[4][3] + P[0][3]*SF[3] + P[1][3]*SF[1] + P[2][3]*SPP[0] - P[3][3]*SPP[2] - P[13][3]*SPP[4]) + SF[11]*(P[4][12] + P[0][12]*SF[3] + P[1][12]*SF[1] + P[2][12]*SPP[0] - P[3][12]*SPP[2] - P[13][12]*SPP[4]) - SPP[6]*(P[4][10] + P[0][10]*SF[3] + P[1][10]*SF[1] + P[2][10]*SPP[0] - P[3][10]*SPP[2] - P[13][10]*SPP[4]) - (q0*(P[4][11] + P[0][11]*SF[3] + P[1][11]*SF[1] + P[2][11]*SPP[0] - P[3][11]*SPP[2] - P[13][11]*SPP[4]))/2;
+    nextP[4][3] = P[4][3] + P[0][3]*SF[3] + P[1][3]*SF[1] + P[2][3]*SPP[0] - P[3][3]*SPP[2] - P[13][3]*SPP[4] + SF[5]*(P[4][0] + P[0][0]*SF[3] + P[1][0]*SF[1] + P[2][0]*SPP[0] - P[3][0]*SPP[2] - P[13][0]*SPP[4]) + SF[4]*(P[4][1] + P[0][1]*SF[3] + P[1][1]*SF[1] + P[2][1]*SPP[0] - P[3][1]*SPP[2] - P[13][1]*SPP[4]) + SF[7]*(P[4][2] + P[0][2]*SF[3] + P[1][2]*SF[1] + P[2][2]*SPP[0] - P[3][2]*SPP[2] - P[13][2]*SPP[4]) - SF[11]*(P[4][11] + P[0][11]*SF[3] + P[1][11]*SF[1] + P[2][11]*SPP[0] - P[3][11]*SPP[2] - P[13][11]*SPP[4]) + SPP[7]*(P[4][10] + P[0][10]*SF[3] + P[1][10]*SF[1] + P[2][10]*SPP[0] - P[3][10]*SPP[2] - P[13][10]*SPP[4]) - (q0*(P[4][12] + P[0][12]*SF[3] + P[1][12]*SF[1] + P[2][12]*SPP[0] - P[3][12]*SPP[2] - P[13][12]*SPP[4]))/2;
+    nextP[4][4] = P[4][4] + P[0][4]*SF[3] + P[1][4]*SF[1] + P[2][4]*SPP[0] - P[3][4]*SPP[2] - P[13][4]*SPP[4] + dvyCov*sq(SG[7] - 2*q0*q3) + dvzCov*sq(SG[6] + 2*q0*q2) + SF[3]*(P[4][0] + P[0][0]*SF[3] + P[1][0]*SF[1] + P[2][0]*SPP[0] - P[3][0]*SPP[2] - P[13][0]*SPP[4]) + SF[1]*(P[4][1] + P[0][1]*SF[3] + P[1][1]*SF[1] + P[2][1]*SPP[0] - P[3][1]*SPP[2] - P[13][1]*SPP[4]) + SPP[0]*(P[4][2] + P[0][2]*SF[3] + P[1][2]*SF[1] + P[2][2]*SPP[0] - P[3][2]*SPP[2] - P[13][2]*SPP[4]) - SPP[2]*(P[4][3] + P[0][3]*SF[3] + P[1][3]*SF[1] + P[2][3]*SPP[0] - P[3][3]*SPP[2] - P[13][3]*SPP[4]) - SPP[4]*(P[4][13] + P[0][13]*SF[3] + P[1][13]*SF[1] + P[2][13]*SPP[0] - P[3][13]*SPP[2] - P[13][13]*SPP[4]) + dvxCov*sq(SG[1] + SG[2] - SG[3] - SG[4]);
+    nextP[4][5] = P[4][5] + SQ[2] + P[0][5]*SF[3] + P[1][5]*SF[1] + P[2][5]*SPP[0] - P[3][5]*SPP[2] - P[13][5]*SPP[4] + SF[2]*(P[4][0] + P[0][0]*SF[3] + P[1][0]*SF[1] + P[2][0]*SPP[0] - P[3][0]*SPP[2] - P[13][0]*SPP[4]) + SF[1]*(P[4][2] + P[0][2]*SF[3] + P[1][2]*SF[1] + P[2][2]*SPP[0] - P[3][2]*SPP[2] - P[13][2]*SPP[4]) + SF[3]*(P[4][3] + P[0][3]*SF[3] + P[1][3]*SF[1] + P[2][3]*SPP[0] - P[3][3]*SPP[2] - P[13][3]*SPP[4]) - SPP[0]*(P[4][1] + P[0][1]*SF[3] + P[1][1]*SF[1] + P[2][1]*SPP[0] - P[3][1]*SPP[2] - P[13][1]*SPP[4]) + SPP[3]*(P[4][13] + P[0][13]*SF[3] + P[1][13]*SF[1] + P[2][13]*SPP[0] - P[3][13]*SPP[2] - P[13][13]*SPP[4]);
+    nextP[4][6] = P[4][6] + SQ[1] + P[0][6]*SF[3] + P[1][6]*SF[1] + P[2][6]*SPP[0] - P[3][6]*SPP[2] - P[13][6]*SPP[4] + SF[2]*(P[4][1] + P[0][1]*SF[3] + P[1][1]*SF[1] + P[2][1]*SPP[0] - P[3][1]*SPP[2] - P[13][1]*SPP[4]) + SF[1]*(P[4][3] + P[0][3]*SF[3] + P[1][3]*SF[1] + P[2][3]*SPP[0] - P[3][3]*SPP[2] - P[13][3]*SPP[4]) + SPP[0]*(P[4][0] + P[0][0]*SF[3] + P[1][0]*SF[1] + P[2][0]*SPP[0] - P[3][0]*SPP[2] - P[13][0]*SPP[4]) - SPP[1]*(P[4][2] + P[0][2]*SF[3] + P[1][2]*SF[1] + P[2][2]*SPP[0] - P[3][2]*SPP[2] - P[13][2]*SPP[4]) - (sq(q0) - sq(q1) - sq(q2) + sq(q3))*(P[4][13] + P[0][13]*SF[3] + P[1][13]*SF[1] + P[2][13]*SPP[0] - P[3][13]*SPP[2] - P[13][13]*SPP[4]);
+    nextP[4][7] = P[4][7] + P[0][7]*SF[3] + P[1][7]*SF[1] + P[2][7]*SPP[0] - P[3][7]*SPP[2] - P[13][7]*SPP[4] + dt*(P[4][4] + P[0][4]*SF[3] + P[1][4]*SF[1] + P[2][4]*SPP[0] - P[3][4]*SPP[2] - P[13][4]*SPP[4]);
+    nextP[4][8] = P[4][8] + P[0][8]*SF[3] + P[1][8]*SF[1] + P[2][8]*SPP[0] - P[3][8]*SPP[2] - P[13][8]*SPP[4] + dt*(P[4][5] + P[0][5]*SF[3] + P[1][5]*SF[1] + P[2][5]*SPP[0] - P[3][5]*SPP[2] - P[13][5]*SPP[4]);
+    nextP[4][9] = P[4][9] + P[0][9]*SF[3] + P[1][9]*SF[1] + P[2][9]*SPP[0] - P[3][9]*SPP[2] - P[13][9]*SPP[4] + dt*(P[4][6] + P[0][6]*SF[3] + P[1][6]*SF[1] + P[2][6]*SPP[0] - P[3][6]*SPP[2] - P[13][6]*SPP[4]);
+    nextP[4][10] = P[4][10] + P[0][10]*SF[3] + P[1][10]*SF[1] + P[2][10]*SPP[0] - P[3][10]*SPP[2] - P[13][10]*SPP[4];
+    nextP[4][11] = P[4][11] + P[0][11]*SF[3] + P[1][11]*SF[1] + P[2][11]*SPP[0] - P[3][11]*SPP[2] - P[13][11]*SPP[4];
+    nextP[4][12] = P[4][12] + P[0][12]*SF[3] + P[1][12]*SF[1] + P[2][12]*SPP[0] - P[3][12]*SPP[2] - P[13][12]*SPP[4];
+    nextP[4][13] = P[4][13] + P[0][13]*SF[3] + P[1][13]*SF[1] + P[2][13]*SPP[0] - P[3][13]*SPP[2] - P[13][13]*SPP[4];
+    nextP[4][14] = P[4][14] + P[0][14]*SF[3] + P[1][14]*SF[1] + P[2][14]*SPP[0] - P[3][14]*SPP[2] - P[13][14]*SPP[4];
+    nextP[4][15] = P[4][15] + P[0][15]*SF[3] + P[1][15]*SF[1] + P[2][15]*SPP[0] - P[3][15]*SPP[2] - P[13][15]*SPP[4];
+    nextP[4][16] = P[4][16] + P[0][16]*SF[3] + P[1][16]*SF[1] + P[2][16]*SPP[0] - P[3][16]*SPP[2] - P[13][16]*SPP[4];
+    nextP[4][17] = P[4][17] + P[0][17]*SF[3] + P[1][17]*SF[1] + P[2][17]*SPP[0] - P[3][17]*SPP[2] - P[13][17]*SPP[4];
+    nextP[4][18] = P[4][18] + P[0][18]*SF[3] + P[1][18]*SF[1] + P[2][18]*SPP[0] - P[3][18]*SPP[2] - P[13][18]*SPP[4];
+    nextP[4][19] = P[4][19] + P[0][19]*SF[3] + P[1][19]*SF[1] + P[2][19]*SPP[0] - P[3][19]*SPP[2] - P[13][19]*SPP[4];
+    nextP[4][20] = P[4][20] + P[0][20]*SF[3] + P[1][20]*SF[1] + P[2][20]*SPP[0] - P[3][20]*SPP[2] - P[13][20]*SPP[4];
+    nextP[4][21] = P[4][21] + P[0][21]*SF[3] + P[1][21]*SF[1] + P[2][21]*SPP[0] - P[3][21]*SPP[2] - P[13][21]*SPP[4];
+    nextP[4][22] = P[4][22] + P[0][22]*SF[3] + P[1][22]*SF[1] + P[2][22]*SPP[0] - P[3][22]*SPP[2] - P[13][22]*SPP[4];
+    nextP[5][0] = P[5][0] + P[0][0]*SF[2] + P[2][0]*SF[1] + P[3][0]*SF[3] - P[1][0]*SPP[0] + P[13][0]*SPP[3] + SF[7]*(P[5][1] + P[0][1]*SF[2] + P[2][1]*SF[1] + P[3][1]*SF[3] - P[1][1]*SPP[0] + P[13][1]*SPP[3]) + SF[9]*(P[5][2] + P[0][2]*SF[2] + P[2][2]*SF[1] + P[3][2]*SF[3] - P[1][2]*SPP[0] + P[13][2]*SPP[3]) + SF[8]*(P[5][3] + P[0][3]*SF[2] + P[2][3]*SF[1] + P[3][3]*SF[3] - P[1][3]*SPP[0] + P[13][3]*SPP[3]) + SF[11]*(P[5][10] + P[0][10]*SF[2] + P[2][10]*SF[1] + P[3][10]*SF[3] - P[1][10]*SPP[0] + P[13][10]*SPP[3]) + SPP[7]*(P[5][11] + P[0][11]*SF[2] + P[2][11]*SF[1] + P[3][11]*SF[3] - P[1][11]*SPP[0] + P[13][11]*SPP[3]) + SPP[6]*(P[5][12] + P[0][12]*SF[2] + P[2][12]*SF[1] + P[3][12]*SF[3] - P[1][12]*SPP[0] + P[13][12]*SPP[3]);
+    nextP[5][1] = P[5][1] + P[0][1]*SF[2] + P[2][1]*SF[1] + P[3][1]*SF[3] - P[1][1]*SPP[0] + P[13][1]*SPP[3] + SF[6]*(P[5][0] + P[0][0]*SF[2] + P[2][0]*SF[1] + P[3][0]*SF[3] - P[1][0]*SPP[0] + P[13][0]*SPP[3]) + SF[5]*(P[5][2] + P[0][2]*SF[2] + P[2][2]*SF[1] + P[3][2]*SF[3] - P[1][2]*SPP[0] + P[13][2]*SPP[3]) + SF[9]*(P[5][3] + P[0][3]*SF[2] + P[2][3]*SF[1] + P[3][3]*SF[3] - P[1][3]*SPP[0] + P[13][3]*SPP[3]) + SPP[6]*(P[5][11] + P[0][11]*SF[2] + P[2][11]*SF[1] + P[3][11]*SF[3] - P[1][11]*SPP[0] + P[13][11]*SPP[3]) - SPP[7]*(P[5][12] + P[0][12]*SF[2] + P[2][12]*SF[1] + P[3][12]*SF[3] - P[1][12]*SPP[0] + P[13][12]*SPP[3]) - (q0*(P[5][10] + P[0][10]*SF[2] + P[2][10]*SF[1] + P[3][10]*SF[3] - P[1][10]*SPP[0] + P[13][10]*SPP[3]))/2;
+    nextP[5][2] = P[5][2] + P[0][2]*SF[2] + P[2][2]*SF[1] + P[3][2]*SF[3] - P[1][2]*SPP[0] + P[13][2]*SPP[3] + SF[4]*(P[5][0] + P[0][0]*SF[2] + P[2][0]*SF[1] + P[3][0]*SF[3] - P[1][0]*SPP[0] + P[13][0]*SPP[3]) + SF[8]*(P[5][1] + P[0][1]*SF[2] + P[2][1]*SF[1] + P[3][1]*SF[3] - P[1][1]*SPP[0] + P[13][1]*SPP[3]) + SF[6]*(P[5][3] + P[0][3]*SF[2] + P[2][3]*SF[1] + P[3][3]*SF[3] - P[1][3]*SPP[0] + P[13][3]*SPP[3]) + SF[11]*(P[5][12] + P[0][12]*SF[2] + P[2][12]*SF[1] + P[3][12]*SF[3] - P[1][12]*SPP[0] + P[13][12]*SPP[3]) - SPP[6]*(P[5][10] + P[0][10]*SF[2] + P[2][10]*SF[1] + P[3][10]*SF[3] - P[1][10]*SPP[0] + P[13][10]*SPP[3]) - (q0*(P[5][11] + P[0][11]*SF[2] + P[2][11]*SF[1] + P[3][11]*SF[3] - P[1][11]*SPP[0] + P[13][11]*SPP[3]))/2;
+    nextP[5][3] = P[5][3] + P[0][3]*SF[2] + P[2][3]*SF[1] + P[3][3]*SF[3] - P[1][3]*SPP[0] + P[13][3]*SPP[3] + SF[5]*(P[5][0] + P[0][0]*SF[2] + P[2][0]*SF[1] + P[3][0]*SF[3] - P[1][0]*SPP[0] + P[13][0]*SPP[3]) + SF[4]*(P[5][1] + P[0][1]*SF[2] + P[2][1]*SF[1] + P[3][1]*SF[3] - P[1][1]*SPP[0] + P[13][1]*SPP[3]) + SF[7]*(P[5][2] + P[0][2]*SF[2] + P[2][2]*SF[1] + P[3][2]*SF[3] - P[1][2]*SPP[0] + P[13][2]*SPP[3]) - SF[11]*(P[5][11] + P[0][11]*SF[2] + P[2][11]*SF[1] + P[3][11]*SF[3] - P[1][11]*SPP[0] + P[13][11]*SPP[3]) + SPP[7]*(P[5][10] + P[0][10]*SF[2] + P[2][10]*SF[1] + P[3][10]*SF[3] - P[1][10]*SPP[0] + P[13][10]*SPP[3]) - (q0*(P[5][12] + P[0][12]*SF[2] + P[2][12]*SF[1] + P[3][12]*SF[3] - P[1][12]*SPP[0] + P[13][12]*SPP[3]))/2;
+    nextP[5][4] = P[5][4] + SQ[2] + P[0][4]*SF[2] + P[2][4]*SF[1] + P[3][4]*SF[3] - P[1][4]*SPP[0] + P[13][4]*SPP[3] + SF[3]*(P[5][0] + P[0][0]*SF[2] + P[2][0]*SF[1] + P[3][0]*SF[3] - P[1][0]*SPP[0] + P[13][0]*SPP[3]) + SF[1]*(P[5][1] + P[0][1]*SF[2] + P[2][1]*SF[1] + P[3][1]*SF[3] - P[1][1]*SPP[0] + P[13][1]*SPP[3]) + SPP[0]*(P[5][2] + P[0][2]*SF[2] + P[2][2]*SF[1] + P[3][2]*SF[3] - P[1][2]*SPP[0] + P[13][2]*SPP[3]) - SPP[2]*(P[5][3] + P[0][3]*SF[2] + P[2][3]*SF[1] + P[3][3]*SF[3] - P[1][3]*SPP[0] + P[13][3]*SPP[3]) - SPP[4]*(P[5][13] + P[0][13]*SF[2] + P[2][13]*SF[1] + P[3][13]*SF[3] - P[1][13]*SPP[0] + P[13][13]*SPP[3]);
+    nextP[5][5] = P[5][5] + P[0][5]*SF[2] + P[2][5]*SF[1] + P[3][5]*SF[3] - P[1][5]*SPP[0] + P[13][5]*SPP[3] + dvxCov*sq(SG[7] + 2*q0*q3) + dvzCov*sq(SG[5] - 2*q0*q1) + SF[2]*(P[5][0] + P[0][0]*SF[2] + P[2][0]*SF[1] + P[3][0]*SF[3] - P[1][0]*SPP[0] + P[13][0]*SPP[3]) + SF[1]*(P[5][2] + P[0][2]*SF[2] + P[2][2]*SF[1] + P[3][2]*SF[3] - P[1][2]*SPP[0] + P[13][2]*SPP[3]) + SF[3]*(P[5][3] + P[0][3]*SF[2] + P[2][3]*SF[1] + P[3][3]*SF[3] - P[1][3]*SPP[0] + P[13][3]*SPP[3]) - SPP[0]*(P[5][1] + P[0][1]*SF[2] + P[2][1]*SF[1] + P[3][1]*SF[3] - P[1][1]*SPP[0] + P[13][1]*SPP[3]) + SPP[3]*(P[5][13] + P[0][13]*SF[2] + P[2][13]*SF[1] + P[3][13]*SF[3] - P[1][13]*SPP[0] + P[13][13]*SPP[3]) + dvyCov*sq(SG[1] - SG[2] + SG[3] - SG[4]);
+    nextP[5][6] = P[5][6] + SQ[0] + P[0][6]*SF[2] + P[2][6]*SF[1] + P[3][6]*SF[3] - P[1][6]*SPP[0] + P[13][6]*SPP[3] + SF[2]*(P[5][1] + P[0][1]*SF[2] + P[2][1]*SF[1] + P[3][1]*SF[3] - P[1][1]*SPP[0] + P[13][1]*SPP[3]) + SF[1]*(P[5][3] + P[0][3]*SF[2] + P[2][3]*SF[1] + P[3][3]*SF[3] - P[1][3]*SPP[0] + P[13][3]*SPP[3]) + SPP[0]*(P[5][0] + P[0][0]*SF[2] + P[2][0]*SF[1] + P[3][0]*SF[3] - P[1][0]*SPP[0] + P[13][0]*SPP[3]) - SPP[1]*(P[5][2] + P[0][2]*SF[2] + P[2][2]*SF[1] + P[3][2]*SF[3] - P[1][2]*SPP[0] + P[13][2]*SPP[3]) - (sq(q0) - sq(q1) - sq(q2) + sq(q3))*(P[5][13] + P[0][13]*SF[2] + P[2][13]*SF[1] + P[3][13]*SF[3] - P[1][13]*SPP[0] + P[13][13]*SPP[3]);
+    nextP[5][7] = P[5][7] + P[0][7]*SF[2] + P[2][7]*SF[1] + P[3][7]*SF[3] - P[1][7]*SPP[0] + P[13][7]*SPP[3] + dt*(P[5][4] + P[0][4]*SF[2] + P[2][4]*SF[1] + P[3][4]*SF[3] - P[1][4]*SPP[0] + P[13][4]*SPP[3]);
+    nextP[5][8] = P[5][8] + P[0][8]*SF[2] + P[2][8]*SF[1] + P[3][8]*SF[3] - P[1][8]*SPP[0] + P[13][8]*SPP[3] + dt*(P[5][5] + P[0][5]*SF[2] + P[2][5]*SF[1] + P[3][5]*SF[3] - P[1][5]*SPP[0] + P[13][5]*SPP[3]);
+    nextP[5][9] = P[5][9] + P[0][9]*SF[2] + P[2][9]*SF[1] + P[3][9]*SF[3] - P[1][9]*SPP[0] + P[13][9]*SPP[3] + dt*(P[5][6] + P[0][6]*SF[2] + P[2][6]*SF[1] + P[3][6]*SF[3] - P[1][6]*SPP[0] + P[13][6]*SPP[3]);
+    nextP[5][10] = P[5][10] + P[0][10]*SF[2] + P[2][10]*SF[1] + P[3][10]*SF[3] - P[1][10]*SPP[0] + P[13][10]*SPP[3];
+    nextP[5][11] = P[5][11] + P[0][11]*SF[2] + P[2][11]*SF[1] + P[3][11]*SF[3] - P[1][11]*SPP[0] + P[13][11]*SPP[3];
+    nextP[5][12] = P[5][12] + P[0][12]*SF[2] + P[2][12]*SF[1] + P[3][12]*SF[3] - P[1][12]*SPP[0] + P[13][12]*SPP[3];
+    nextP[5][13] = P[5][13] + P[0][13]*SF[2] + P[2][13]*SF[1] + P[3][13]*SF[3] - P[1][13]*SPP[0] + P[13][13]*SPP[3];
+    nextP[5][14] = P[5][14] + P[0][14]*SF[2] + P[2][14]*SF[1] + P[3][14]*SF[3] - P[1][14]*SPP[0] + P[13][14]*SPP[3];
+    nextP[5][15] = P[5][15] + P[0][15]*SF[2] + P[2][15]*SF[1] + P[3][15]*SF[3] - P[1][15]*SPP[0] + P[13][15]*SPP[3];
+    nextP[5][16] = P[5][16] + P[0][16]*SF[2] + P[2][16]*SF[1] + P[3][16]*SF[3] - P[1][16]*SPP[0] + P[13][16]*SPP[3];
+    nextP[5][17] = P[5][17] + P[0][17]*SF[2] + P[2][17]*SF[1] + P[3][17]*SF[3] - P[1][17]*SPP[0] + P[13][17]*SPP[3];
+    nextP[5][18] = P[5][18] + P[0][18]*SF[2] + P[2][18]*SF[1] + P[3][18]*SF[3] - P[1][18]*SPP[0] + P[13][18]*SPP[3];
+    nextP[5][19] = P[5][19] + P[0][19]*SF[2] + P[2][19]*SF[1] + P[3][19]*SF[3] - P[1][19]*SPP[0] + P[13][19]*SPP[3];
+    nextP[5][20] = P[5][20] + P[0][20]*SF[2] + P[2][20]*SF[1] + P[3][20]*SF[3] - P[1][20]*SPP[0] + P[13][20]*SPP[3];
+    nextP[5][21] = P[5][21] + P[0][21]*SF[2] + P[2][21]*SF[1] + P[3][21]*SF[3] - P[1][21]*SPP[0] + P[13][21]*SPP[3];
+    nextP[5][22] = P[5][22] + P[0][22]*SF[2] + P[2][22]*SF[1] + P[3][22]*SF[3] - P[1][22]*SPP[0] + P[13][22]*SPP[3];
+    nextP[6][0] = P[6][0] + P[1][0]*SF[2] + P[3][0]*SF[1] + P[0][0]*SPP[0] - P[2][0]*SPP[1] - P[13][0]*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + SF[7]*(P[6][1] + P[1][1]*SF[2] + P[3][1]*SF[1] + P[0][1]*SPP[0] - P[2][1]*SPP[1] - P[13][1]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SF[9]*(P[6][2] + P[1][2]*SF[2] + P[3][2]*SF[1] + P[0][2]*SPP[0] - P[2][2]*SPP[1] - P[13][2]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SF[8]*(P[6][3] + P[1][3]*SF[2] + P[3][3]*SF[1] + P[0][3]*SPP[0] - P[2][3]*SPP[1] - P[13][3]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SF[11]*(P[6][10] + P[1][10]*SF[2] + P[3][10]*SF[1] + P[0][10]*SPP[0] - P[2][10]*SPP[1] - P[13][10]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SPP[7]*(P[6][11] + P[1][11]*SF[2] + P[3][11]*SF[1] + P[0][11]*SPP[0] - P[2][11]*SPP[1] - P[13][11]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SPP[6]*(P[6][12] + P[1][12]*SF[2] + P[3][12]*SF[1] + P[0][12]*SPP[0] - P[2][12]*SPP[1] - P[13][12]*(sq(q0) - sq(q1) - sq(q2) + sq(q3)));
+    nextP[6][1] = P[6][1] + P[1][1]*SF[2] + P[3][1]*SF[1] + P[0][1]*SPP[0] - P[2][1]*SPP[1] - P[13][1]*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + SF[6]*(P[6][0] + P[1][0]*SF[2] + P[3][0]*SF[1] + P[0][0]*SPP[0] - P[2][0]*SPP[1] - P[13][0]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SF[5]*(P[6][2] + P[1][2]*SF[2] + P[3][2]*SF[1] + P[0][2]*SPP[0] - P[2][2]*SPP[1] - P[13][2]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SF[9]*(P[6][3] + P[1][3]*SF[2] + P[3][3]*SF[1] + P[0][3]*SPP[0] - P[2][3]*SPP[1] - P[13][3]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SPP[6]*(P[6][11] + P[1][11]*SF[2] + P[3][11]*SF[1] + P[0][11]*SPP[0] - P[2][11]*SPP[1] - P[13][11]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) - SPP[7]*(P[6][12] + P[1][12]*SF[2] + P[3][12]*SF[1] + P[0][12]*SPP[0] - P[2][12]*SPP[1] - P[13][12]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) - (q0*(P[6][10] + P[1][10]*SF[2] + P[3][10]*SF[1] + P[0][10]*SPP[0] - P[2][10]*SPP[1] - P[13][10]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))))/2;
+    nextP[6][2] = P[6][2] + P[1][2]*SF[2] + P[3][2]*SF[1] + P[0][2]*SPP[0] - P[2][2]*SPP[1] - P[13][2]*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + SF[4]*(P[6][0] + P[1][0]*SF[2] + P[3][0]*SF[1] + P[0][0]*SPP[0] - P[2][0]*SPP[1] - P[13][0]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SF[8]*(P[6][1] + P[1][1]*SF[2] + P[3][1]*SF[1] + P[0][1]*SPP[0] - P[2][1]*SPP[1] - P[13][1]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SF[6]*(P[6][3] + P[1][3]*SF[2] + P[3][3]*SF[1] + P[0][3]*SPP[0] - P[2][3]*SPP[1] - P[13][3]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SF[11]*(P[6][12] + P[1][12]*SF[2] + P[3][12]*SF[1] + P[0][12]*SPP[0] - P[2][12]*SPP[1] - P[13][12]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) - SPP[6]*(P[6][10] + P[1][10]*SF[2] + P[3][10]*SF[1] + P[0][10]*SPP[0] - P[2][10]*SPP[1] - P[13][10]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) - (q0*(P[6][11] + P[1][11]*SF[2] + P[3][11]*SF[1] + P[0][11]*SPP[0] - P[2][11]*SPP[1] - P[13][11]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))))/2;
+    nextP[6][3] = P[6][3] + P[1][3]*SF[2] + P[3][3]*SF[1] + P[0][3]*SPP[0] - P[2][3]*SPP[1] - P[13][3]*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + SF[5]*(P[6][0] + P[1][0]*SF[2] + P[3][0]*SF[1] + P[0][0]*SPP[0] - P[2][0]*SPP[1] - P[13][0]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SF[4]*(P[6][1] + P[1][1]*SF[2] + P[3][1]*SF[1] + P[0][1]*SPP[0] - P[2][1]*SPP[1] - P[13][1]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SF[7]*(P[6][2] + P[1][2]*SF[2] + P[3][2]*SF[1] + P[0][2]*SPP[0] - P[2][2]*SPP[1] - P[13][2]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) - SF[11]*(P[6][11] + P[1][11]*SF[2] + P[3][11]*SF[1] + P[0][11]*SPP[0] - P[2][11]*SPP[1] - P[13][11]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SPP[7]*(P[6][10] + P[1][10]*SF[2] + P[3][10]*SF[1] + P[0][10]*SPP[0] - P[2][10]*SPP[1] - P[13][10]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) - (q0*(P[6][12] + P[1][12]*SF[2] + P[3][12]*SF[1] + P[0][12]*SPP[0] - P[2][12]*SPP[1] - P[13][12]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))))/2;
+    nextP[6][4] = P[6][4] + SQ[1] + P[1][4]*SF[2] + P[3][4]*SF[1] + P[0][4]*SPP[0] - P[2][4]*SPP[1] - P[13][4]*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + SF[3]*(P[6][0] + P[1][0]*SF[2] + P[3][0]*SF[1] + P[0][0]*SPP[0] - P[2][0]*SPP[1] - P[13][0]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SF[1]*(P[6][1] + P[1][1]*SF[2] + P[3][1]*SF[1] + P[0][1]*SPP[0] - P[2][1]*SPP[1] - P[13][1]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SPP[0]*(P[6][2] + P[1][2]*SF[2] + P[3][2]*SF[1] + P[0][2]*SPP[0] - P[2][2]*SPP[1] - P[13][2]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) - SPP[2]*(P[6][3] + P[1][3]*SF[2] + P[3][3]*SF[1] + P[0][3]*SPP[0] - P[2][3]*SPP[1] - P[13][3]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) - SPP[4]*(P[6][13] + P[1][13]*SF[2] + P[3][13]*SF[1] + P[0][13]*SPP[0] - P[2][13]*SPP[1] - P[13][13]*(sq(q0) - sq(q1) - sq(q2) + sq(q3)));
+    nextP[6][5] = P[6][5] + SQ[0] + P[1][5]*SF[2] + P[3][5]*SF[1] + P[0][5]*SPP[0] - P[2][5]*SPP[1] - P[13][5]*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + SF[2]*(P[6][0] + P[1][0]*SF[2] + P[3][0]*SF[1] + P[0][0]*SPP[0] - P[2][0]*SPP[1] - P[13][0]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SF[1]*(P[6][2] + P[1][2]*SF[2] + P[3][2]*SF[1] + P[0][2]*SPP[0] - P[2][2]*SPP[1] - P[13][2]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SF[3]*(P[6][3] + P[1][3]*SF[2] + P[3][3]*SF[1] + P[0][3]*SPP[0] - P[2][3]*SPP[1] - P[13][3]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) - SPP[0]*(P[6][1] + P[1][1]*SF[2] + P[3][1]*SF[1] + P[0][1]*SPP[0] - P[2][1]*SPP[1] - P[13][1]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SPP[3]*(P[6][13] + P[1][13]*SF[2] + P[3][13]*SF[1] + P[0][13]*SPP[0] - P[2][13]*SPP[1] - P[13][13]*(sq(q0) - sq(q1) - sq(q2) + sq(q3)));
+    nextP[6][6] = P[6][6] + P[1][6]*SF[2] + P[3][6]*SF[1] + P[0][6]*SPP[0] - P[2][6]*SPP[1] - P[13][6]*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + dvxCov*sq(SG[6] - 2*q0*q2) + dvyCov*sq(SG[5] + 2*q0*q1) - SPP[5]*(P[6][13] + P[1][13]*SF[2] + P[3][13]*SF[1] + P[0][13]*SPP[0] - P[2][13]*SPP[1] - P[13][13]*SPP[5]) + SF[2]*(P[6][1] + P[1][1]*SF[2] + P[3][1]*SF[1] + P[0][1]*SPP[0] - P[2][1]*SPP[1] - P[13][1]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SF[1]*(P[6][3] + P[1][3]*SF[2] + P[3][3]*SF[1] + P[0][3]*SPP[0] - P[2][3]*SPP[1] - P[13][3]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + SPP[0]*(P[6][0] + P[1][0]*SF[2] + P[3][0]*SF[1] + P[0][0]*SPP[0] - P[2][0]*SPP[1] - P[13][0]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) - SPP[1]*(P[6][2] + P[1][2]*SF[2] + P[3][2]*SF[1] + P[0][2]*SPP[0] - P[2][2]*SPP[1] - P[13][2]*(sq(q0) - sq(q1) - sq(q2) + sq(q3))) + dvzCov*sq(SG[1] - SG[2] - SG[3] + SG[4]);
+    nextP[6][7] = P[6][7] + P[1][7]*SF[2] + P[3][7]*SF[1] + P[0][7]*SPP[0] - P[2][7]*SPP[1] - P[13][7]*SPP[5] + dt*(P[6][4] + P[1][4]*SF[2] + P[3][4]*SF[1] + P[0][4]*SPP[0] - P[2][4]*SPP[1] - P[13][4]*SPP[5]);
+    nextP[6][8] = P[6][8] + P[1][8]*SF[2] + P[3][8]*SF[1] + P[0][8]*SPP[0] - P[2][8]*SPP[1] - P[13][8]*SPP[5] + dt*(P[6][5] + P[1][5]*SF[2] + P[3][5]*SF[1] + P[0][5]*SPP[0] - P[2][5]*SPP[1] - P[13][5]*SPP[5]);
+    nextP[6][9] = P[6][9] + P[1][9]*SF[2] + P[3][9]*SF[1] + P[0][9]*SPP[0] - P[2][9]*SPP[1] - P[13][9]*SPP[5] + dt*(P[6][6] + P[1][6]*SF[2] + P[3][6]*SF[1] + P[0][6]*SPP[0] - P[2][6]*SPP[1] - P[13][6]*SPP[5]);
+    nextP[6][10] = P[6][10] + P[1][10]*SF[2] + P[3][10]*SF[1] + P[0][10]*SPP[0] - P[2][10]*SPP[1] - P[13][10]*SPP[5];
+    nextP[6][11] = P[6][11] + P[1][11]*SF[2] + P[3][11]*SF[1] + P[0][11]*SPP[0] - P[2][11]*SPP[1] - P[13][11]*SPP[5];
+    nextP[6][12] = P[6][12] + P[1][12]*SF[2] + P[3][12]*SF[1] + P[0][12]*SPP[0] - P[2][12]*SPP[1] - P[13][12]*SPP[5];
+    nextP[6][13] = P[6][13] + P[1][13]*SF[2] + P[3][13]*SF[1] + P[0][13]*SPP[0] - P[2][13]*SPP[1] - P[13][13]*SPP[5];
+    nextP[6][14] = P[6][14] + P[1][14]*SF[2] + P[3][14]*SF[1] + P[0][14]*SPP[0] - P[2][14]*SPP[1] - P[13][14]*SPP[5];
+    nextP[6][15] = P[6][15] + P[1][15]*SF[2] + P[3][15]*SF[1] + P[0][15]*SPP[0] - P[2][15]*SPP[1] - P[13][15]*SPP[5];
+    nextP[6][16] = P[6][16] + P[1][16]*SF[2] + P[3][16]*SF[1] + P[0][16]*SPP[0] - P[2][16]*SPP[1] - P[13][16]*SPP[5];
+    nextP[6][17] = P[6][17] + P[1][17]*SF[2] + P[3][17]*SF[1] + P[0][17]*SPP[0] - P[2][17]*SPP[1] - P[13][17]*SPP[5];
+    nextP[6][18] = P[6][18] + P[1][18]*SF[2] + P[3][18]*SF[1] + P[0][18]*SPP[0] - P[2][18]*SPP[1] - P[13][18]*SPP[5];
+    nextP[6][19] = P[6][19] + P[1][19]*SF[2] + P[3][19]*SF[1] + P[0][19]*SPP[0] - P[2][19]*SPP[1] - P[13][19]*SPP[5];
+    nextP[6][20] = P[6][20] + P[1][20]*SF[2] + P[3][20]*SF[1] + P[0][20]*SPP[0] - P[2][20]*SPP[1] - P[13][20]*SPP[5];
+    nextP[6][21] = P[6][21] + P[1][21]*SF[2] + P[3][21]*SF[1] + P[0][21]*SPP[0] - P[2][21]*SPP[1] - P[13][21]*SPP[5];
+    nextP[6][22] = P[6][22] + P[1][22]*SF[2] + P[3][22]*SF[1] + P[0][22]*SPP[0] - P[2][22]*SPP[1] - P[13][22]*SPP[5];
+    nextP[7][0] = P[7][0] + P[4][0]*dt + SF[7]*(P[7][1] + P[4][1]*dt) + SF[9]*(P[7][2] + P[4][2]*dt) + SF[8]*(P[7][3] + P[4][3]*dt) + SF[11]*(P[7][10] + P[4][10]*dt) + SPP[7]*(P[7][11] + P[4][11]*dt) + SPP[6]*(P[7][12] + P[4][12]*dt);
+    nextP[7][1] = P[7][1] + P[4][1]*dt + SF[6]*(P[7][0] + P[4][0]*dt) + SF[5]*(P[7][2] + P[4][2]*dt) + SF[9]*(P[7][3] + P[4][3]*dt) + SPP[6]*(P[7][11] + P[4][11]*dt) - SPP[7]*(P[7][12] + P[4][12]*dt) - (q0*(P[7][10] + P[4][10]*dt))/2;
+    nextP[7][2] = P[7][2] + P[4][2]*dt + SF[4]*(P[7][0] + P[4][0]*dt) + SF[8]*(P[7][1] + P[4][1]*dt) + SF[6]*(P[7][3] + P[4][3]*dt) + SF[11]*(P[7][12] + P[4][12]*dt) - SPP[6]*(P[7][10] + P[4][10]*dt) - (q0*(P[7][11] + P[4][11]*dt))/2;
+    nextP[7][3] = P[7][3] + P[4][3]*dt + SF[5]*(P[7][0] + P[4][0]*dt) + SF[4]*(P[7][1] + P[4][1]*dt) + SF[7]*(P[7][2] + P[4][2]*dt) - SF[11]*(P[7][11] + P[4][11]*dt) + SPP[7]*(P[7][10] + P[4][10]*dt) - (q0*(P[7][12] + P[4][12]*dt))/2;
+    nextP[7][4] = P[7][4] + P[4][4]*dt + SF[1]*(P[7][1] + P[4][1]*dt) + SF[3]*(P[7][0] + P[4][0]*dt) + SPP[0]*(P[7][2] + P[4][2]*dt) - SPP[2]*(P[7][3] + P[4][3]*dt) - SPP[4]*(P[7][13] + P[4][13]*dt);
+    nextP[7][5] = P[7][5] + P[4][5]*dt + SF[2]*(P[7][0] + P[4][0]*dt) + SF[1]*(P[7][2] + P[4][2]*dt) + SF[3]*(P[7][3] + P[4][3]*dt) - SPP[0]*(P[7][1] + P[4][1]*dt) + SPP[3]*(P[7][13] + P[4][13]*dt);
+    nextP[7][6] = P[7][6] + P[4][6]*dt + SF[2]*(P[7][1] + P[4][1]*dt) + SF[1]*(P[7][3] + P[4][3]*dt) + SPP[0]*(P[7][0] + P[4][0]*dt) - SPP[1]*(P[7][2] + P[4][2]*dt) - SPP[5]*(P[7][13] + P[4][13]*dt);
+    nextP[7][7] = P[7][7] + P[4][7]*dt + dt*(P[7][4] + P[4][4]*dt);
+    nextP[7][8] = P[7][8] + P[4][8]*dt + dt*(P[7][5] + P[4][5]*dt);
+    nextP[7][9] = P[7][9] + P[4][9]*dt + dt*(P[7][6] + P[4][6]*dt);
+    nextP[7][10] = P[7][10] + P[4][10]*dt;
+    nextP[7][11] = P[7][11] + P[4][11]*dt;
+    nextP[7][12] = P[7][12] + P[4][12]*dt;
+    nextP[7][13] = P[7][13] + P[4][13]*dt;
+    nextP[7][14] = P[7][14] + P[4][14]*dt;
+    nextP[7][15] = P[7][15] + P[4][15]*dt;
+    nextP[7][16] = P[7][16] + P[4][16]*dt;
+    nextP[7][17] = P[7][17] + P[4][17]*dt;
+    nextP[7][18] = P[7][18] + P[4][18]*dt;
+    nextP[7][19] = P[7][19] + P[4][19]*dt;
+    nextP[7][20] = P[7][20] + P[4][20]*dt;
+    nextP[7][21] = P[7][21] + P[4][21]*dt;
+    nextP[7][22] = P[7][22] + P[4][22]*dt;
+    nextP[8][0] = P[8][0] + P[5][0]*dt + SF[7]*(P[8][1] + P[5][1]*dt) + SF[9]*(P[8][2] + P[5][2]*dt) + SF[8]*(P[8][3] + P[5][3]*dt) + SF[11]*(P[8][10] + P[5][10]*dt) + SPP[7]*(P[8][11] + P[5][11]*dt) + SPP[6]*(P[8][12] + P[5][12]*dt);
+    nextP[8][1] = P[8][1] + P[5][1]*dt + SF[6]*(P[8][0] + P[5][0]*dt) + SF[5]*(P[8][2] + P[5][2]*dt) + SF[9]*(P[8][3] + P[5][3]*dt) + SPP[6]*(P[8][11] + P[5][11]*dt) - SPP[7]*(P[8][12] + P[5][12]*dt) - (q0*(P[8][10] + P[5][10]*dt))/2;
+    nextP[8][2] = P[8][2] + P[5][2]*dt + SF[4]*(P[8][0] + P[5][0]*dt) + SF[8]*(P[8][1] + P[5][1]*dt) + SF[6]*(P[8][3] + P[5][3]*dt) + SF[11]*(P[8][12] + P[5][12]*dt) - SPP[6]*(P[8][10] + P[5][10]*dt) - (q0*(P[8][11] + P[5][11]*dt))/2;
+    nextP[8][3] = P[8][3] + P[5][3]*dt + SF[5]*(P[8][0] + P[5][0]*dt) + SF[4]*(P[8][1] + P[5][1]*dt) + SF[7]*(P[8][2] + P[5][2]*dt) - SF[11]*(P[8][11] + P[5][11]*dt) + SPP[7]*(P[8][10] + P[5][10]*dt) - (q0*(P[8][12] + P[5][12]*dt))/2;
+    nextP[8][4] = P[8][4] + P[5][4]*dt + SF[1]*(P[8][1] + P[5][1]*dt) + SF[3]*(P[8][0] + P[5][0]*dt) + SPP[0]*(P[8][2] + P[5][2]*dt) - SPP[2]*(P[8][3] + P[5][3]*dt) - SPP[4]*(P[8][13] + P[5][13]*dt);
+    nextP[8][5] = P[8][5] + P[5][5]*dt + SF[2]*(P[8][0] + P[5][0]*dt) + SF[1]*(P[8][2] + P[5][2]*dt) + SF[3]*(P[8][3] + P[5][3]*dt) - SPP[0]*(P[8][1] + P[5][1]*dt) + SPP[3]*(P[8][13] + P[5][13]*dt);
+    nextP[8][6] = P[8][6] + P[5][6]*dt + SF[2]*(P[8][1] + P[5][1]*dt) + SF[1]*(P[8][3] + P[5][3]*dt) + SPP[0]*(P[8][0] + P[5][0]*dt) - SPP[1]*(P[8][2] + P[5][2]*dt) - SPP[5]*(P[8][13] + P[5][13]*dt);
+    nextP[8][7] = P[8][7] + P[5][7]*dt + dt*(P[8][4] + P[5][4]*dt);
+    nextP[8][8] = P[8][8] + P[5][8]*dt + dt*(P[8][5] + P[5][5]*dt);
+    nextP[8][9] = P[8][9] + P[5][9]*dt + dt*(P[8][6] + P[5][6]*dt);
+    nextP[8][10] = P[8][10] + P[5][10]*dt;
+    nextP[8][11] = P[8][11] + P[5][11]*dt;
+    nextP[8][12] = P[8][12] + P[5][12]*dt;
+    nextP[8][13] = P[8][13] + P[5][13]*dt;
+    nextP[8][14] = P[8][14] + P[5][14]*dt;
+    nextP[8][15] = P[8][15] + P[5][15]*dt;
+    nextP[8][16] = P[8][16] + P[5][16]*dt;
+    nextP[8][17] = P[8][17] + P[5][17]*dt;
+    nextP[8][18] = P[8][18] + P[5][18]*dt;
+    nextP[8][19] = P[8][19] + P[5][19]*dt;
+    nextP[8][20] = P[8][20] + P[5][20]*dt;
+    nextP[8][21] = P[8][21] + P[5][21]*dt;
+    nextP[8][22] = P[8][22] + P[5][22]*dt;
+    nextP[9][0] = P[9][0] + P[6][0]*dt + SF[7]*(P[9][1] + P[6][1]*dt) + SF[9]*(P[9][2] + P[6][2]*dt) + SF[8]*(P[9][3] + P[6][3]*dt) + SF[11]*(P[9][10] + P[6][10]*dt) + SPP[7]*(P[9][11] + P[6][11]*dt) + SPP[6]*(P[9][12] + P[6][12]*dt);
+    nextP[9][1] = P[9][1] + P[6][1]*dt + SF[6]*(P[9][0] + P[6][0]*dt) + SF[5]*(P[9][2] + P[6][2]*dt) + SF[9]*(P[9][3] + P[6][3]*dt) + SPP[6]*(P[9][11] + P[6][11]*dt) - SPP[7]*(P[9][12] + P[6][12]*dt) - (q0*(P[9][10] + P[6][10]*dt))/2;
+    nextP[9][2] = P[9][2] + P[6][2]*dt + SF[4]*(P[9][0] + P[6][0]*dt) + SF[8]*(P[9][1] + P[6][1]*dt) + SF[6]*(P[9][3] + P[6][3]*dt) + SF[11]*(P[9][12] + P[6][12]*dt) - SPP[6]*(P[9][10] + P[6][10]*dt) - (q0*(P[9][11] + P[6][11]*dt))/2;
+    nextP[9][3] = P[9][3] + P[6][3]*dt + SF[5]*(P[9][0] + P[6][0]*dt) + SF[4]*(P[9][1] + P[6][1]*dt) + SF[7]*(P[9][2] + P[6][2]*dt) - SF[11]*(P[9][11] + P[6][11]*dt) + SPP[7]*(P[9][10] + P[6][10]*dt) - (q0*(P[9][12] + P[6][12]*dt))/2;
+    nextP[9][4] = P[9][4] + P[6][4]*dt + SF[1]*(P[9][1] + P[6][1]*dt) + SF[3]*(P[9][0] + P[6][0]*dt) + SPP[0]*(P[9][2] + P[6][2]*dt) - SPP[2]*(P[9][3] + P[6][3]*dt) - SPP[4]*(P[9][13] + P[6][13]*dt);
+    nextP[9][5] = P[9][5] + P[6][5]*dt + SF[2]*(P[9][0] + P[6][0]*dt) + SF[1]*(P[9][2] + P[6][2]*dt) + SF[3]*(P[9][3] + P[6][3]*dt) - SPP[0]*(P[9][1] + P[6][1]*dt) + SPP[3]*(P[9][13] + P[6][13]*dt);
+    nextP[9][6] = P[9][6] + P[6][6]*dt + SF[2]*(P[9][1] + P[6][1]*dt) + SF[1]*(P[9][3] + P[6][3]*dt) + SPP[0]*(P[9][0] + P[6][0]*dt) - SPP[1]*(P[9][2] + P[6][2]*dt) - SPP[5]*(P[9][13] + P[6][13]*dt);
+    nextP[9][7] = P[9][7] + P[6][7]*dt + dt*(P[9][4] + P[6][4]*dt);
+    nextP[9][8] = P[9][8] + P[6][8]*dt + dt*(P[9][5] + P[6][5]*dt);
+    nextP[9][9] = P[9][9] + P[6][9]*dt + dt*(P[9][6] + P[6][6]*dt);
+    nextP[9][10] = P[9][10] + P[6][10]*dt;
+    nextP[9][11] = P[9][11] + P[6][11]*dt;
+    nextP[9][12] = P[9][12] + P[6][12]*dt;
+    nextP[9][13] = P[9][13] + P[6][13]*dt;
+    nextP[9][14] = P[9][14] + P[6][14]*dt;
+    nextP[9][15] = P[9][15] + P[6][15]*dt;
+    nextP[9][16] = P[9][16] + P[6][16]*dt;
+    nextP[9][17] = P[9][17] + P[6][17]*dt;
+    nextP[9][18] = P[9][18] + P[6][18]*dt;
+    nextP[9][19] = P[9][19] + P[6][19]*dt;
+    nextP[9][20] = P[9][20] + P[6][20]*dt;
+    nextP[9][21] = P[9][21] + P[6][21]*dt;
+    nextP[9][22] = P[9][22] + P[6][22]*dt;
+    nextP[10][0] = P[10][0] + P[10][1]*SF[7] + P[10][2]*SF[9] + P[10][3]*SF[8] + P[10][10]*SF[11] + P[10][11]*SPP[7] + P[10][12]*SPP[6];
+    nextP[10][1] = P[10][1] + P[10][0]*SF[6] + P[10][2]*SF[5] + P[10][3]*SF[9] + P[10][11]*SPP[6] - P[10][12]*SPP[7] - (P[10][10]*q0)/2;
+    nextP[10][2] = P[10][2] + P[10][0]*SF[4] + P[10][1]*SF[8] + P[10][3]*SF[6] + P[10][12]*SF[11] - P[10][10]*SPP[6] - (P[10][11]*q0)/2;
+    nextP[10][3] = P[10][3] + P[10][0]*SF[5] + P[10][1]*SF[4] + P[10][2]*SF[7] - P[10][11]*SF[11] + P[10][10]*SPP[7] - (P[10][12]*q0)/2;
+    nextP[10][4] = P[10][4] + P[10][1]*SF[1] + P[10][0]*SF[3] + P[10][2]*SPP[0] - P[10][3]*SPP[2] - P[10][13]*SPP[4];
+    nextP[10][5] = P[10][5] + P[10][0]*SF[2] + P[10][2]*SF[1] + P[10][3]*SF[3] - P[10][1]*SPP[0] + P[10][13]*SPP[3];
+    nextP[10][6] = P[10][6] + P[10][1]*SF[2] + P[10][3]*SF[1] + P[10][0]*SPP[0] - P[10][2]*SPP[1] - P[10][13]*SPP[5];
+    nextP[10][7] = P[10][7] + P[10][4]*dt;
+    nextP[10][8] = P[10][8] + P[10][5]*dt;
+    nextP[10][9] = P[10][9] + P[10][6]*dt;
+    nextP[10][10] = P[10][10];
+    nextP[10][11] = P[10][11];
+    nextP[10][12] = P[10][12];
+    nextP[10][13] = P[10][13];
+    nextP[10][14] = P[10][14];
+    nextP[10][15] = P[10][15];
+    nextP[10][16] = P[10][16];
+    nextP[10][17] = P[10][17];
+    nextP[10][18] = P[10][18];
+    nextP[10][19] = P[10][19];
+    nextP[10][20] = P[10][20];
+    nextP[10][21] = P[10][21];
+    nextP[10][22] = P[10][22];
+    nextP[11][0] = P[11][0] + P[11][1]*SF[7] + P[11][2]*SF[9] + P[11][3]*SF[8] + P[11][10]*SF[11] + P[11][11]*SPP[7] + P[11][12]*SPP[6];
+    nextP[11][1] = P[11][1] + P[11][0]*SF[6] + P[11][2]*SF[5] + P[11][3]*SF[9] + P[11][11]*SPP[6] - P[11][12]*SPP[7] - (P[11][10]*q0)/2;
+    nextP[11][2] = P[11][2] + P[11][0]*SF[4] + P[11][1]*SF[8] + P[11][3]*SF[6] + P[11][12]*SF[11] - P[11][10]*SPP[6] - (P[11][11]*q0)/2;
+    nextP[11][3] = P[11][3] + P[11][0]*SF[5] + P[11][1]*SF[4] + P[11][2]*SF[7] - P[11][11]*SF[11] + P[11][10]*SPP[7] - (P[11][12]*q0)/2;
+    nextP[11][4] = P[11][4] + P[11][1]*SF[1] + P[11][0]*SF[3] + P[11][2]*SPP[0] - P[11][3]*SPP[2] - P[11][13]*SPP[4];
+    nextP[11][5] = P[11][5] + P[11][0]*SF[2] + P[11][2]*SF[1] + P[11][3]*SF[3] - P[11][1]*SPP[0] + P[11][13]*SPP[3];
+    nextP[11][6] = P[11][6] + P[11][1]*SF[2] + P[11][3]*SF[1] + P[11][0]*SPP[0] - P[11][2]*SPP[1] - P[11][13]*SPP[5];
+    nextP[11][7] = P[11][7] + P[11][4]*dt;
+    nextP[11][8] = P[11][8] + P[11][5]*dt;
+    nextP[11][9] = P[11][9] + P[11][6]*dt;
+    nextP[11][10] = P[11][10];
+    nextP[11][11] = P[11][11];
+    nextP[11][12] = P[11][12];
+    nextP[11][13] = P[11][13];
+    nextP[11][14] = P[11][14];
+    nextP[11][15] = P[11][15];
+    nextP[11][16] = P[11][16];
+    nextP[11][17] = P[11][17];
+    nextP[11][18] = P[11][18];
+    nextP[11][19] = P[11][19];
+    nextP[11][20] = P[11][20];
+    nextP[11][21] = P[11][21];
+    nextP[11][22] = P[11][22];
+    nextP[12][0] = P[12][0] + P[12][1]*SF[7] + P[12][2]*SF[9] + P[12][3]*SF[8] + P[12][10]*SF[11] + P[12][11]*SPP[7] + P[12][12]*SPP[6];
+    nextP[12][1] = P[12][1] + P[12][0]*SF[6] + P[12][2]*SF[5] + P[12][3]*SF[9] + P[12][11]*SPP[6] - P[12][12]*SPP[7] - (P[12][10]*q0)/2;
+    nextP[12][2] = P[12][2] + P[12][0]*SF[4] + P[12][1]*SF[8] + P[12][3]*SF[6] + P[12][12]*SF[11] - P[12][10]*SPP[6] - (P[12][11]*q0)/2;
+    nextP[12][3] = P[12][3] + P[12][0]*SF[5] + P[12][1]*SF[4] + P[12][2]*SF[7] - P[12][11]*SF[11] + P[12][10]*SPP[7] - (P[12][12]*q0)/2;
+    nextP[12][4] = P[12][4] + P[12][1]*SF[1] + P[12][0]*SF[3] + P[12][2]*SPP[0] - P[12][3]*SPP[2] - P[12][13]*SPP[4];
+    nextP[12][5] = P[12][5] + P[12][0]*SF[2] + P[12][2]*SF[1] + P[12][3]*SF[3] - P[12][1]*SPP[0] + P[12][13]*SPP[3];
+    nextP[12][6] = P[12][6] + P[12][1]*SF[2] + P[12][3]*SF[1] + P[12][0]*SPP[0] - P[12][2]*SPP[1] - P[12][13]*SPP[5];
+    nextP[12][7] = P[12][7] + P[12][4]*dt;
+    nextP[12][8] = P[12][8] + P[12][5]*dt;
+    nextP[12][9] = P[12][9] + P[12][6]*dt;
+    nextP[12][10] = P[12][10];
+    nextP[12][11] = P[12][11];
+    nextP[12][12] = P[12][12];
+    nextP[12][13] = P[12][13];
+    nextP[12][14] = P[12][14];
+    nextP[12][15] = P[12][15];
+    nextP[12][16] = P[12][16];
+    nextP[12][17] = P[12][17];
+    nextP[12][18] = P[12][18];
+    nextP[12][19] = P[12][19];
+    nextP[12][20] = P[12][20];
+    nextP[12][21] = P[12][21];
+    nextP[12][22] = P[12][22];
+    nextP[13][0] = P[13][0] + P[13][1]*SF[7] + P[13][2]*SF[9] + P[13][3]*SF[8] + P[13][10]*SF[11] + P[13][11]*SPP[7] + P[13][12]*SPP[6];
+    nextP[13][1] = P[13][1] + P[13][0]*SF[6] + P[13][2]*SF[5] + P[13][3]*SF[9] + P[13][11]*SPP[6] - P[13][12]*SPP[7] - (P[13][10]*q0)/2;
+    nextP[13][2] = P[13][2] + P[13][0]*SF[4] + P[13][1]*SF[8] + P[13][3]*SF[6] + P[13][12]*SF[11] - P[13][10]*SPP[6] - (P[13][11]*q0)/2;
+    nextP[13][3] = P[13][3] + P[13][0]*SF[5] + P[13][1]*SF[4] + P[13][2]*SF[7] - P[13][11]*SF[11] + P[13][10]*SPP[7] - (P[13][12]*q0)/2;
+    nextP[13][4] = P[13][4] + P[13][1]*SF[1] + P[13][0]*SF[3] + P[13][2]*SPP[0] - P[13][3]*SPP[2] - P[13][13]*SPP[4];
+    nextP[13][5] = P[13][5] + P[13][0]*SF[2] + P[13][2]*SF[1] + P[13][3]*SF[3] - P[13][1]*SPP[0] + P[13][13]*SPP[3];
+    nextP[13][6] = P[13][6] + P[13][1]*SF[2] + P[13][3]*SF[1] + P[13][0]*SPP[0] - P[13][2]*SPP[1] - P[13][13]*SPP[5];
+    nextP[13][7] = P[13][7] + P[13][4]*dt;
+    nextP[13][8] = P[13][8] + P[13][5]*dt;
+    nextP[13][9] = P[13][9] + P[13][6]*dt;
+    nextP[13][10] = P[13][10];
+    nextP[13][11] = P[13][11];
+    nextP[13][12] = P[13][12];
+    nextP[13][13] = P[13][13];
+    nextP[13][14] = P[13][14];
+    nextP[13][15] = P[13][15];
+    nextP[13][16] = P[13][16];
+    nextP[13][17] = P[13][17];
+    nextP[13][18] = P[13][18];
+    nextP[13][19] = P[13][19];
+    nextP[13][20] = P[13][20];
+    nextP[13][21] = P[13][21];
+    nextP[13][22] = P[13][22];
+    nextP[14][0] = P[14][0] + P[14][1]*SF[7] + P[14][2]*SF[9] + P[14][3]*SF[8] + P[14][10]*SF[11] + P[14][11]*SPP[7] + P[14][12]*SPP[6];
+    nextP[14][1] = P[14][1] + P[14][0]*SF[6] + P[14][2]*SF[5] + P[14][3]*SF[9] + P[14][11]*SPP[6] - P[14][12]*SPP[7] - (P[14][10]*q0)/2;
+    nextP[14][2] = P[14][2] + P[14][0]*SF[4] + P[14][1]*SF[8] + P[14][3]*SF[6] + P[14][12]*SF[11] - P[14][10]*SPP[6] - (P[14][11]*q0)/2;
+    nextP[14][3] = P[14][3] + P[14][0]*SF[5] + P[14][1]*SF[4] + P[14][2]*SF[7] - P[14][11]*SF[11] + P[14][10]*SPP[7] - (P[14][12]*q0)/2;
+    nextP[14][4] = P[14][4] + P[14][1]*SF[1] + P[14][0]*SF[3] + P[14][2]*SPP[0] - P[14][3]*SPP[2] - P[14][13]*SPP[4];
+    nextP[14][5] = P[14][5] + P[14][0]*SF[2] + P[14][2]*SF[1] + P[14][3]*SF[3] - P[14][1]*SPP[0] + P[14][13]*SPP[3];
+    nextP[14][6] = P[14][6] + P[14][1]*SF[2] + P[14][3]*SF[1] + P[14][0]*SPP[0] - P[14][2]*SPP[1] - P[14][13]*SPP[5];
+    nextP[14][7] = P[14][7] + P[14][4]*dt;
+    nextP[14][8] = P[14][8] + P[14][5]*dt;
+    nextP[14][9] = P[14][9] + P[14][6]*dt;
+    nextP[14][10] = P[14][10];
+    nextP[14][11] = P[14][11];
+    nextP[14][12] = P[14][12];
+    nextP[14][13] = P[14][13];
+    nextP[14][14] = P[14][14];
+    nextP[14][15] = P[14][15];
+    nextP[14][16] = P[14][16];
+    nextP[14][17] = P[14][17];
+    nextP[14][18] = P[14][18];
+    nextP[14][19] = P[14][19];
+    nextP[14][20] = P[14][20];
+    nextP[14][21] = P[14][21];
+    nextP[14][22] = P[14][22];
+    nextP[15][0] = P[15][0] + P[15][1]*SF[7] + P[15][2]*SF[9] + P[15][3]*SF[8] + P[15][10]*SF[11] + P[15][11]*SPP[7] + P[15][12]*SPP[6];
+    nextP[15][1] = P[15][1] + P[15][0]*SF[6] + P[15][2]*SF[5] + P[15][3]*SF[9] + P[15][11]*SPP[6] - P[15][12]*SPP[7] - (P[15][10]*q0)/2;
+    nextP[15][2] = P[15][2] + P[15][0]*SF[4] + P[15][1]*SF[8] + P[15][3]*SF[6] + P[15][12]*SF[11] - P[15][10]*SPP[6] - (P[15][11]*q0)/2;
+    nextP[15][3] = P[15][3] + P[15][0]*SF[5] + P[15][1]*SF[4] + P[15][2]*SF[7] - P[15][11]*SF[11] + P[15][10]*SPP[7] - (P[15][12]*q0)/2;
+    nextP[15][4] = P[15][4] + P[15][1]*SF[1] + P[15][0]*SF[3] + P[15][2]*SPP[0] - P[15][3]*SPP[2] - P[15][13]*SPP[4];
+    nextP[15][5] = P[15][5] + P[15][0]*SF[2] + P[15][2]*SF[1] + P[15][3]*SF[3] - P[15][1]*SPP[0] + P[15][13]*SPP[3];
+    nextP[15][6] = P[15][6] + P[15][1]*SF[2] + P[15][3]*SF[1] + P[15][0]*SPP[0] - P[15][2]*SPP[1] - P[15][13]*SPP[5];
+    nextP[15][7] = P[15][7] + P[15][4]*dt;
+    nextP[15][8] = P[15][8] + P[15][5]*dt;
+    nextP[15][9] = P[15][9] + P[15][6]*dt;
+    nextP[15][10] = P[15][10];
+    nextP[15][11] = P[15][11];
+    nextP[15][12] = P[15][12];
+    nextP[15][13] = P[15][13];
+    nextP[15][14] = P[15][14];
+    nextP[15][15] = P[15][15];
+    nextP[15][16] = P[15][16];
+    nextP[15][17] = P[15][17];
+    nextP[15][18] = P[15][18];
+    nextP[15][19] = P[15][19];
+    nextP[15][20] = P[15][20];
+    nextP[15][21] = P[15][21];
+    nextP[15][22] = P[15][22];
+    nextP[16][0] = P[16][0] + P[16][1]*SF[7] + P[16][2]*SF[9] + P[16][3]*SF[8] + P[16][10]*SF[11] + P[16][11]*SPP[7] + P[16][12]*SPP[6];
+    nextP[16][1] = P[16][1] + P[16][0]*SF[6] + P[16][2]*SF[5] + P[16][3]*SF[9] + P[16][11]*SPP[6] - P[16][12]*SPP[7] - (P[16][10]*q0)/2;
+    nextP[16][2] = P[16][2] + P[16][0]*SF[4] + P[16][1]*SF[8] + P[16][3]*SF[6] + P[16][12]*SF[11] - P[16][10]*SPP[6] - (P[16][11]*q0)/2;
+    nextP[16][3] = P[16][3] + P[16][0]*SF[5] + P[16][1]*SF[4] + P[16][2]*SF[7] - P[16][11]*SF[11] + P[16][10]*SPP[7] - (P[16][12]*q0)/2;
+    nextP[16][4] = P[16][4] + P[16][1]*SF[1] + P[16][0]*SF[3] + P[16][2]*SPP[0] - P[16][3]*SPP[2] - P[16][13]*SPP[4];
+    nextP[16][5] = P[16][5] + P[16][0]*SF[2] + P[16][2]*SF[1] + P[16][3]*SF[3] - P[16][1]*SPP[0] + P[16][13]*SPP[3];
+    nextP[16][6] = P[16][6] + P[16][1]*SF[2] + P[16][3]*SF[1] + P[16][0]*SPP[0] - P[16][2]*SPP[1] - P[16][13]*SPP[5];
+    nextP[16][7] = P[16][7] + P[16][4]*dt;
+    nextP[16][8] = P[16][8] + P[16][5]*dt;
+    nextP[16][9] = P[16][9] + P[16][6]*dt;
+    nextP[16][10] = P[16][10];
+    nextP[16][11] = P[16][11];
+    nextP[16][12] = P[16][12];
+    nextP[16][13] = P[16][13];
+    nextP[16][14] = P[16][14];
+    nextP[16][15] = P[16][15];
+    nextP[16][16] = P[16][16];
+    nextP[16][17] = P[16][17];
+    nextP[16][18] = P[16][18];
+    nextP[16][19] = P[16][19];
+    nextP[16][20] = P[16][20];
+    nextP[16][21] = P[16][21];
+    nextP[16][22] = P[16][22];
+    nextP[17][0] = P[17][0] + P[17][1]*SF[7] + P[17][2]*SF[9] + P[17][3]*SF[8] + P[17][10]*SF[11] + P[17][11]*SPP[7] + P[17][12]*SPP[6];
+    nextP[17][1] = P[17][1] + P[17][0]*SF[6] + P[17][2]*SF[5] + P[17][3]*SF[9] + P[17][11]*SPP[6] - P[17][12]*SPP[7] - (P[17][10]*q0)/2;
+    nextP[17][2] = P[17][2] + P[17][0]*SF[4] + P[17][1]*SF[8] + P[17][3]*SF[6] + P[17][12]*SF[11] - P[17][10]*SPP[6] - (P[17][11]*q0)/2;
+    nextP[17][3] = P[17][3] + P[17][0]*SF[5] + P[17][1]*SF[4] + P[17][2]*SF[7] - P[17][11]*SF[11] + P[17][10]*SPP[7] - (P[17][12]*q0)/2;
+    nextP[17][4] = P[17][4] + P[17][1]*SF[1] + P[17][0]*SF[3] + P[17][2]*SPP[0] - P[17][3]*SPP[2] - P[17][13]*SPP[4];
+    nextP[17][5] = P[17][5] + P[17][0]*SF[2] + P[17][2]*SF[1] + P[17][3]*SF[3] - P[17][1]*SPP[0] + P[17][13]*SPP[3];
+    nextP[17][6] = P[17][6] + P[17][1]*SF[2] + P[17][3]*SF[1] + P[17][0]*SPP[0] - P[17][2]*SPP[1] - P[17][13]*SPP[5];
+    nextP[17][7] = P[17][7] + P[17][4]*dt;
+    nextP[17][8] = P[17][8] + P[17][5]*dt;
+    nextP[17][9] = P[17][9] + P[17][6]*dt;
+    nextP[17][10] = P[17][10];
+    nextP[17][11] = P[17][11];
+    nextP[17][12] = P[17][12];
+    nextP[17][13] = P[17][13];
+    nextP[17][14] = P[17][14];
+    nextP[17][15] = P[17][15];
+    nextP[17][16] = P[17][16];
+    nextP[17][17] = P[17][17];
+    nextP[17][18] = P[17][18];
+    nextP[17][19] = P[17][19];
+    nextP[17][20] = P[17][20];
+    nextP[17][21] = P[17][21];
+    nextP[17][22] = P[17][22];
+    nextP[18][0] = P[18][0] + P[18][1]*SF[7] + P[18][2]*SF[9] + P[18][3]*SF[8] + P[18][10]*SF[11] + P[18][11]*SPP[7] + P[18][12]*SPP[6];
+    nextP[18][1] = P[18][1] + P[18][0]*SF[6] + P[18][2]*SF[5] + P[18][3]*SF[9] + P[18][11]*SPP[6] - P[18][12]*SPP[7] - (P[18][10]*q0)/2;
+    nextP[18][2] = P[18][2] + P[18][0]*SF[4] + P[18][1]*SF[8] + P[18][3]*SF[6] + P[18][12]*SF[11] - P[18][10]*SPP[6] - (P[18][11]*q0)/2;
+    nextP[18][3] = P[18][3] + P[18][0]*SF[5] + P[18][1]*SF[4] + P[18][2]*SF[7] - P[18][11]*SF[11] + P[18][10]*SPP[7] - (P[18][12]*q0)/2;
+    nextP[18][4] = P[18][4] + P[18][1]*SF[1] + P[18][0]*SF[3] + P[18][2]*SPP[0] - P[18][3]*SPP[2] - P[18][13]*SPP[4];
+    nextP[18][5] = P[18][5] + P[18][0]*SF[2] + P[18][2]*SF[1] + P[18][3]*SF[3] - P[18][1]*SPP[0] + P[18][13]*SPP[3];
+    nextP[18][6] = P[18][6] + P[18][1]*SF[2] + P[18][3]*SF[1] + P[18][0]*SPP[0] - P[18][2]*SPP[1] - P[18][13]*SPP[5];
+    nextP[18][7] = P[18][7] + P[18][4]*dt;
+    nextP[18][8] = P[18][8] + P[18][5]*dt;
+    nextP[18][9] = P[18][9] + P[18][6]*dt;
+    nextP[18][10] = P[18][10];
+    nextP[18][11] = P[18][11];
+    nextP[18][12] = P[18][12];
+    nextP[18][13] = P[18][13];
+    nextP[18][14] = P[18][14];
+    nextP[18][15] = P[18][15];
+    nextP[18][16] = P[18][16];
+    nextP[18][17] = P[18][17];
+    nextP[18][18] = P[18][18];
+    nextP[18][19] = P[18][19];
+    nextP[18][20] = P[18][20];
+    nextP[18][21] = P[18][21];
+    nextP[18][22] = P[18][22];
+    nextP[19][0] = P[19][0] + P[19][1]*SF[7] + P[19][2]*SF[9] + P[19][3]*SF[8] + P[19][10]*SF[11] + P[19][11]*SPP[7] + P[19][12]*SPP[6];
+    nextP[19][1] = P[19][1] + P[19][0]*SF[6] + P[19][2]*SF[5] + P[19][3]*SF[9] + P[19][11]*SPP[6] - P[19][12]*SPP[7] - (P[19][10]*q0)/2;
+    nextP[19][2] = P[19][2] + P[19][0]*SF[4] + P[19][1]*SF[8] + P[19][3]*SF[6] + P[19][12]*SF[11] - P[19][10]*SPP[6] - (P[19][11]*q0)/2;
+    nextP[19][3] = P[19][3] + P[19][0]*SF[5] + P[19][1]*SF[4] + P[19][2]*SF[7] - P[19][11]*SF[11] + P[19][10]*SPP[7] - (P[19][12]*q0)/2;
+    nextP[19][4] = P[19][4] + P[19][1]*SF[1] + P[19][0]*SF[3] + P[19][2]*SPP[0] - P[19][3]*SPP[2] - P[19][13]*SPP[4];
+    nextP[19][5] = P[19][5] + P[19][0]*SF[2] + P[19][2]*SF[1] + P[19][3]*SF[3] - P[19][1]*SPP[0] + P[19][13]*SPP[3];
+    nextP[19][6] = P[19][6] + P[19][1]*SF[2] + P[19][3]*SF[1] + P[19][0]*SPP[0] - P[19][2]*SPP[1] - P[19][13]*SPP[5];
+    nextP[19][7] = P[19][7] + P[19][4]*dt;
+    nextP[19][8] = P[19][8] + P[19][5]*dt;
+    nextP[19][9] = P[19][9] + P[19][6]*dt;
+    nextP[19][10] = P[19][10];
+    nextP[19][11] = P[19][11];
+    nextP[19][12] = P[19][12];
+    nextP[19][13] = P[19][13];
+    nextP[19][14] = P[19][14];
+    nextP[19][15] = P[19][15];
+    nextP[19][16] = P[19][16];
+    nextP[19][17] = P[19][17];
+    nextP[19][18] = P[19][18];
+    nextP[19][19] = P[19][19];
+    nextP[19][20] = P[19][20];
+    nextP[19][21] = P[19][21];
+    nextP[19][22] = P[19][22];
+    nextP[20][0] = P[20][0] + P[20][1]*SF[7] + P[20][2]*SF[9] + P[20][3]*SF[8] + P[20][10]*SF[11] + P[20][11]*SPP[7] + P[20][12]*SPP[6];
+    nextP[20][1] = P[20][1] + P[20][0]*SF[6] + P[20][2]*SF[5] + P[20][3]*SF[9] + P[20][11]*SPP[6] - P[20][12]*SPP[7] - (P[20][10]*q0)/2;
+    nextP[20][2] = P[20][2] + P[20][0]*SF[4] + P[20][1]*SF[8] + P[20][3]*SF[6] + P[20][12]*SF[11] - P[20][10]*SPP[6] - (P[20][11]*q0)/2;
+    nextP[20][3] = P[20][3] + P[20][0]*SF[5] + P[20][1]*SF[4] + P[20][2]*SF[7] - P[20][11]*SF[11] + P[20][10]*SPP[7] - (P[20][12]*q0)/2;
+    nextP[20][4] = P[20][4] + P[20][1]*SF[1] + P[20][0]*SF[3] + P[20][2]*SPP[0] - P[20][3]*SPP[2] - P[20][13]*SPP[4];
+    nextP[20][5] = P[20][5] + P[20][0]*SF[2] + P[20][2]*SF[1] + P[20][3]*SF[3] - P[20][1]*SPP[0] + P[20][13]*SPP[3];
+    nextP[20][6] = P[20][6] + P[20][1]*SF[2] + P[20][3]*SF[1] + P[20][0]*SPP[0] - P[20][2]*SPP[1] - P[20][13]*SPP[5];
+    nextP[20][7] = P[20][7] + P[20][4]*dt;
+    nextP[20][8] = P[20][8] + P[20][5]*dt;
+    nextP[20][9] = P[20][9] + P[20][6]*dt;
+    nextP[20][10] = P[20][10];
+    nextP[20][11] = P[20][11];
+    nextP[20][12] = P[20][12];
+    nextP[20][13] = P[20][13];
+    nextP[20][14] = P[20][14];
+    nextP[20][15] = P[20][15];
+    nextP[20][16] = P[20][16];
+    nextP[20][17] = P[20][17];
+    nextP[20][18] = P[20][18];
+    nextP[20][19] = P[20][19];
+    nextP[20][20] = P[20][20];
+    nextP[20][21] = P[20][21];
+    nextP[20][22] = P[20][22];
+    nextP[21][0] = P[21][0] + P[21][1]*SF[7] + P[21][2]*SF[9] + P[21][3]*SF[8] + P[21][10]*SF[11] + P[21][11]*SPP[7] + P[21][12]*SPP[6];
+    nextP[21][1] = P[21][1] + P[21][0]*SF[6] + P[21][2]*SF[5] + P[21][3]*SF[9] + P[21][11]*SPP[6] - P[21][12]*SPP[7] - (P[21][10]*q0)/2;
+    nextP[21][2] = P[21][2] + P[21][0]*SF[4] + P[21][1]*SF[8] + P[21][3]*SF[6] + P[21][12]*SF[11] - P[21][10]*SPP[6] - (P[21][11]*q0)/2;
+    nextP[21][3] = P[21][3] + P[21][0]*SF[5] + P[21][1]*SF[4] + P[21][2]*SF[7] - P[21][11]*SF[11] + P[21][10]*SPP[7] - (P[21][12]*q0)/2;
+    nextP[21][4] = P[21][4] + P[21][1]*SF[1] + P[21][0]*SF[3] + P[21][2]*SPP[0] - P[21][3]*SPP[2] - P[21][13]*SPP[4];
+    nextP[21][5] = P[21][5] + P[21][0]*SF[2] + P[21][2]*SF[1] + P[21][3]*SF[3] - P[21][1]*SPP[0] + P[21][13]*SPP[3];
+    nextP[21][6] = P[21][6] + P[21][1]*SF[2] + P[21][3]*SF[1] + P[21][0]*SPP[0] - P[21][2]*SPP[1] - P[21][13]*SPP[5];
+    nextP[21][7] = P[21][7] + P[21][4]*dt;
+    nextP[21][8] = P[21][8] + P[21][5]*dt;
+    nextP[21][9] = P[21][9] + P[21][6]*dt;
+    nextP[21][10] = P[21][10];
+    nextP[21][11] = P[21][11];
+    nextP[21][12] = P[21][12];
+    nextP[21][13] = P[21][13];
+    nextP[21][14] = P[21][14];
+    nextP[21][15] = P[21][15];
+    nextP[21][16] = P[21][16];
+    nextP[21][17] = P[21][17];
+    nextP[21][18] = P[21][18];
+    nextP[21][19] = P[21][19];
+    nextP[21][20] = P[21][20];
+    nextP[21][21] = P[21][21];
+    nextP[21][22] = P[21][22];
+    nextP[22][0] = P[22][0] + P[22][1]*SF[7] + P[22][2]*SF[9] + P[22][3]*SF[8] + P[22][10]*SF[11] + P[22][11]*SPP[7] + P[22][12]*SPP[6];
+    nextP[22][1] = P[22][1] + P[22][0]*SF[6] + P[22][2]*SF[5] + P[22][3]*SF[9] + P[22][11]*SPP[6] - P[22][12]*SPP[7] - (P[22][10]*q0)/2;
+    nextP[22][2] = P[22][2] + P[22][0]*SF[4] + P[22][1]*SF[8] + P[22][3]*SF[6] + P[22][12]*SF[11] - P[22][10]*SPP[6] - (P[22][11]*q0)/2;
+    nextP[22][3] = P[22][3] + P[22][0]*SF[5] + P[22][1]*SF[4] + P[22][2]*SF[7] - P[22][11]*SF[11] + P[22][10]*SPP[7] - (P[22][12]*q0)/2;
+    nextP[22][4] = P[22][4] + P[22][1]*SF[1] + P[22][0]*SF[3] + P[22][2]*SPP[0] - P[22][3]*SPP[2] - P[22][13]*SPP[4];
+    nextP[22][5] = P[22][5] + P[22][0]*SF[2] + P[22][2]*SF[1] + P[22][3]*SF[3] - P[22][1]*SPP[0] + P[22][13]*SPP[3];
+    nextP[22][6] = P[22][6] + P[22][1]*SF[2] + P[22][3]*SF[1] + P[22][0]*SPP[0] - P[22][2]*SPP[1] - P[22][13]*SPP[5];
+    nextP[22][7] = P[22][7] + P[22][4]*dt;
+    nextP[22][8] = P[22][8] + P[22][5]*dt;
+    nextP[22][9] = P[22][9] + P[22][6]*dt;
+    nextP[22][10] = P[22][10];
+    nextP[22][11] = P[22][11];
+    nextP[22][12] = P[22][12];
+    nextP[22][13] = P[22][13];
+    nextP[22][14] = P[22][14];
+    nextP[22][15] = P[22][15];
+    nextP[22][16] = P[22][16];
+    nextP[22][17] = P[22][17];
+    nextP[22][18] = P[22][18];
+    nextP[22][19] = P[22][19];
+    nextP[22][20] = P[22][20];
+    nextP[22][21] = P[22][21];
+    nextP[22][22] = P[22][22];
+
+    for (unsigned i = 0; i < n_states; i++)
+    {
+        nextP[i][i] = nextP[i][i] + processNoise[i];
+    }
+
+    // If on ground or no magnetometer fitted, inhibit magnetometer bias updates by
+    // setting the coresponding covariance terms to zero.
+    if (onGround || !useCompass)
+    {
+        zeroRows(nextP,16,21);
+        zeroCols(nextP,16,21);
+    }
+
+    // If on ground or not using airspeed sensing, inhibit wind velocity
+    // covariance growth.
+    if (onGround || !useAirspeed)
+    {
+        zeroRows(nextP,14,15);
+        zeroCols(nextP,14,15);
+    }
+
+    // If on ground, inhibit terrain offset updates by
+    // setting the coresponding covariance terms to zero.
+    if (onGround)
+    {
+        zeroRows(nextP,22,22);
+        zeroCols(nextP,22,22);
+    }
+
+    // If the total position variance exceds 1E6 (1000m), then stop covariance
+    // growth by setting the predicted to the previous values
+    // This prevent an ill conditioned matrix from occurring for long periods
+    // without GPS
+    if ((P[7][7] + P[8][8]) > 1E6f)
+    {
+        for (uint8_t i=7; i<=8; i++)
+        {
+            for (unsigned j = 0; j < n_states; j++)
+            {
+                nextP[i][j] = P[i][j];
+                nextP[j][i] = P[j][i];
+            }
+        }
+    }
+
+    if (onGround || staticMode) {
+        // copy the portion of the variances we want to
+        // propagate
+        for (unsigned i = 0; i <= 13; i++) {
+            P[i][i] = nextP[i][i];
+        }
+
+        // force symmetry for observable states
+        // force zero for non-observable states
+        for (unsigned i = 1; i < n_states; i++)
+        {
+            for (uint8_t j = 0; j < i; j++)
+            {
+                if ((i > 13) || (j > 13)) {
+                    P[i][j] = 0.0f;
+                } else {
+                    P[i][j] = 0.5f * (nextP[i][j] + nextP[j][i]);
+                }
+                P[j][i] = P[i][j];
+            }
+        }
+
+    } else {
+
+        // Copy covariance
+        for (unsigned i = 0; i < n_states; i++) {
+            P[i][i] = nextP[i][i];
+        }
+
+        // force symmetry for observable states
+        for (unsigned i = 1; i < n_states; i++)
+        {
+            for (uint8_t j = 0; j < i; j++)
+            {
+                P[i][j] = 0.5f * (nextP[i][j] + nextP[j][i]);
+                P[j][i] = P[i][j];
+            }
+        }
+
+    }
+
+    ConstrainVariances();
+}
+
+void AttPosEKF::FuseVelposNED()
+{
+
+// declare variables used by fault isolation logic
+    uint32_t gpsRetryTime = 3000; // time in msec before GPS fusion will be retried following innovation consistency failure
+    uint32_t gpsRetryTimeNoTAS = 500; // retry time if no TAS measurement available
+    uint32_t hgtRetryTime = 500; // height measurement retry time
+    uint32_t horizRetryTime;
+
+// declare variables used to check measurement errors
+    float velInnov[3] = {0.0f,0.0f,0.0f};
+    float posInnov[2] = {0.0f,0.0f};
+    float hgtInnov = 0.0f;
+
+// declare variables used to control access to arrays
+    bool fuseData[6] = {false,false,false,false,false,false};
+    uint8_t stateIndex;
+    uint8_t obsIndex;
+    uint8_t indexLimit;
+
+// declare variables used by state and covariance update calculations
+    float velErr;
+    float posErr;
+    float R_OBS[6];
+    float observation[6];
+    float SK;
+    float quatMag;
+
+// Perform sequential fusion of GPS measurements. This assumes that the
+// errors in the different velocity and position components are
+// uncorrelated which is not true, however in the absence of covariance
+// data from the GPS receiver it is the only assumption we can make
+// so we might as well take advantage of the computational efficiencies
+// associated with sequential fusion
+    if (fuseVelData || fusePosData || fuseHgtData)
+    {
+        // set the GPS data timeout depending on whether airspeed data is present
+        if (useAirspeed) horizRetryTime = gpsRetryTime;
+        else horizRetryTime = gpsRetryTimeNoTAS;
+
+        // Form the observation vector
+        for (uint8_t i=0; i<=2; i++) observation[i] = velNED[i];
+        for (uint8_t i=3; i<=4; i++) observation[i] = posNE[i-3];
+        observation[5] = -(hgtMea);
+
+        // Estimate the GPS Velocity, GPS horiz position and height measurement variances.
+        velErr = 0.2f*accNavMag; // additional error in GPS velocities caused by manoeuvring
+        posErr = 0.2f*accNavMag; // additional error in GPS position caused by manoeuvring
+        R_OBS[0] = sq(vneSigma) + sq(velErr);
+        R_OBS[1] = R_OBS[0];
+        R_OBS[2] = sq(vdSigma) + sq(velErr);
+        R_OBS[3] = sq(posNeSigma) + sq(posErr);
+        R_OBS[4] = R_OBS[3];
+        R_OBS[5] = sq(posDSigma) + sq(posErr);
+
+        // Set innovation variances to zero default
+        for (uint8_t i = 0; i<=5; i++)
+        {
+            varInnovVelPos[i] = 0.0f;
+        }
+        // calculate innovations and check GPS data validity using an innovation consistency check
+        if (fuseVelData)
+        {
+            // test velocity measurements
+            uint8_t imax = 2;
+            if (fusionModeGPS == 1) imax = 1;
+            for (uint8_t i = 0; i<=imax; i++)
+            {
+                velInnov[i] = statesAtVelTime[i+4] - velNED[i];
+                stateIndex = 4 + i;
+                varInnovVelPos[i] = P[stateIndex][stateIndex] + R_OBS[i];
+            }
+            // apply a 5-sigma threshold
+            current_ekf_state.velHealth = (sq(velInnov[0]) + sq(velInnov[1]) + sq(velInnov[2])) < 25.0f * (varInnovVelPos[0] + varInnovVelPos[1] + varInnovVelPos[2]);
+            current_ekf_state.velTimeout = (millis() - current_ekf_state.velFailTime) > horizRetryTime;
+            if (current_ekf_state.velHealth || current_ekf_state.velTimeout)
+            {
+                current_ekf_state.velHealth = true;
+                current_ekf_state.velFailTime = millis();
+            }
+            else
+            {
+                current_ekf_state.velHealth = false;
+            }
+        }
+        if (fusePosData)
+        {
+            // test horizontal position measurements
+            posInnov[0] = statesAtPosTime[7] - posNE[0];
+            posInnov[1] = statesAtPosTime[8] - posNE[1];
+            varInnovVelPos[3] = P[7][7] + R_OBS[3];
+            varInnovVelPos[4] = P[8][8] + R_OBS[4];
+            // apply a 10-sigma threshold
+            current_ekf_state.posHealth = (sq(posInnov[0]) + sq(posInnov[1])) < 100.0f*(varInnovVelPos[3] + varInnovVelPos[4]);
+            current_ekf_state.posTimeout = (millis() - current_ekf_state.posFailTime) > horizRetryTime;
+            if (current_ekf_state.posHealth || current_ekf_state.posTimeout)
+            {
+                current_ekf_state.posHealth = true;
+                current_ekf_state.posFailTime = millis();
+            }
+            else
+            {
+                current_ekf_state.posHealth = false;
+            }
+        }
+        // test height measurements
+        if (fuseHgtData)
+        {
+            hgtInnov = statesAtHgtTime[9] + hgtMea;
+            varInnovVelPos[5] = P[9][9] + R_OBS[5];
+            // apply a 10-sigma threshold
+            current_ekf_state.hgtHealth = sq(hgtInnov) < 100.0f*varInnovVelPos[5];
+            current_ekf_state.hgtTimeout = (millis() - current_ekf_state.hgtFailTime) > hgtRetryTime;
+            if (current_ekf_state.hgtHealth || current_ekf_state.hgtTimeout)
+            {
+                current_ekf_state.hgtHealth = true;
+                current_ekf_state.hgtFailTime = millis();
+            }
+            else
+            {
+                current_ekf_state.hgtHealth = false;
+            }
+        }
+        // Set range for sequential fusion of velocity and position measurements depending
+        // on which data is available and its health
+        if (fuseVelData && fusionModeGPS == 0 && current_ekf_state.velHealth)
+        {
+            fuseData[0] = true;
+            fuseData[1] = true;
+            fuseData[2] = true;
+        }
+        if (fuseVelData && fusionModeGPS == 1 && current_ekf_state.velHealth)
+        {
+            fuseData[0] = true;
+            fuseData[1] = true;
+        }
+        if (fusePosData && fusionModeGPS <= 2 && current_ekf_state.posHealth)
+        {
+            fuseData[3] = true;
+            fuseData[4] = true;
+        }
+        if (fuseHgtData && current_ekf_state.hgtHealth)
+        {
+            fuseData[5] = true;
+        }
+        // Limit range of states modified when on ground
+        if(!onGround)
+        {
+            indexLimit = 22;
+        }
+        else
+        {
+            indexLimit = 13;
+        }
+        // Fuse measurements sequentially
+        for (obsIndex=0; obsIndex<=5; obsIndex++)
+        {
+            if (fuseData[obsIndex])
+            {
+                stateIndex = 4 + obsIndex;
+                // Calculate the measurement innovation, using states from a
+                // different time coordinate if fusing height data
+                if (obsIndex <= 2)
+                {
+                    innovVelPos[obsIndex] = statesAtVelTime[stateIndex] - observation[obsIndex];
+                }
+                else if (obsIndex == 3 || obsIndex == 4)
+                {
+                    innovVelPos[obsIndex] = statesAtPosTime[stateIndex] - observation[obsIndex];
+                }
+                else if (obsIndex == 5)
+                {
+                    innovVelPos[obsIndex] = statesAtHgtTime[stateIndex] - observation[obsIndex];
+                }
+                // Calculate the Kalman Gain
+                // Calculate innovation variances - also used for data logging
+                varInnovVelPos[obsIndex] = P[stateIndex][stateIndex] + R_OBS[obsIndex];
+                SK = 1.0/(double)varInnovVelPos[obsIndex];
+                for (uint8_t i= 0; i<=indexLimit; i++)
+                {
+                    Kfusion[i] = P[i][stateIndex]*SK;
+                }
+
+                // Don't update Z accel bias state unless using a height observation (GPS velocities can be biased)
+                if (obsIndex != 5) {
+                    Kfusion[13] = 0;
+                }
+
+                // Calculate state corrections and re-normalise the quaternions
+                for (uint8_t i = 0; i<=indexLimit; i++)
+                {
+                    states[i] = states[i] - Kfusion[i] * innovVelPos[obsIndex];
+                }
+                quatMag = sqrt(states[0]*states[0] + states[1]*states[1] + states[2]*states[2] + states[3]*states[3]);
+                if (quatMag > 1e-12f) // divide by  0 protection
+                {
+                    for (uint8_t i = 0; i<=3; i++)
+                    {
+                        states[i] = states[i] / quatMag;
+                    }
+                }
+                // Update the covariance - take advantage of direct observation of a
+                // single state at index = stateIndex to reduce computations
+                // Optimised implementation of standard equation P = (I - K*H)*P;
+                for (uint8_t i= 0; i<=indexLimit; i++)
+                {
+                    for (uint8_t j= 0; j<=indexLimit; j++)
+                    {
+                        KHP[i][j] = Kfusion[i] * P[stateIndex][j];
+                    }
+                }
+                for (uint8_t i= 0; i<=indexLimit; i++)
+                {
+                    for (uint8_t j= 0; j<=indexLimit; j++)
+                    {
+                        P[i][j] = P[i][j] - KHP[i][j];
+                    }
+                }
+            }
+        }
+    }
+
+    ForceSymmetry();
+    ConstrainVariances();
+
+}
+
+void AttPosEKF::FuseMagnetometer()
+{
+
+    float &q0 = magstate.q0;
+    float &q1 = magstate.q1;
+    float &q2 = magstate.q2;
+    float &q3 = magstate.q3;
+    float &magN = magstate.magN;
+    float &magE = magstate.magE;
+    float &magD = magstate.magD;
+    float &magXbias = magstate.magXbias;
+    float &magYbias = magstate.magYbias;
+    float &magZbias = magstate.magZbias;
+    unsigned &obsIndex = magstate.obsIndex;
+    Mat3f &DCM = magstate.DCM;
+    float *MagPred = &magstate.MagPred[0];
+    float &R_MAG = magstate.R_MAG;
+    float *SH_MAG = &magstate.SH_MAG[0];
+
+    float SK_MX[6];
+    float SK_MY[5];
+    float SK_MZ[6];
+    float H_MAG[n_states];
+    for (uint8_t i = 0; i < n_states; i++) {
+        H_MAG[i] = 0.0f;
+    }
+    unsigned indexLimit;
+
+// Perform sequential fusion of Magnetometer measurements.
+// This assumes that the errors in the different components are
+// uncorrelated which is not true, however in the absence of covariance
+// data fit is the only assumption we can make
+// so we might as well take advantage of the computational efficiencies
+// associated with sequential fusion
+    if (useCompass && fuseMagData && (obsIndex < 3))
+    {
+        // Limit range of states modified when on ground
+        if(!onGround)
+        {
+            indexLimit = n_states;
+        }
+        else
+        {
+            indexLimit = 13 + 1;
+        }
+
+        // Sequential fusion of XYZ components to spread processing load across
+        // three prediction time steps.
+
+        // Calculate observation jacobians and Kalman gains
+        if (obsIndex == 0)
+        {
+            // Copy required states to local variable names
+            q0       = statesAtMagMeasTime[0];
+            q1       = statesAtMagMeasTime[1];
+            q2       = statesAtMagMeasTime[2];
+            q3       = statesAtMagMeasTime[3];
+            magN     = statesAtMagMeasTime[16];
+            magE     = statesAtMagMeasTime[17];
+            magD     = statesAtMagMeasTime[18];
+            magXbias = statesAtMagMeasTime[19];
+            magYbias = statesAtMagMeasTime[20];
+            magZbias = statesAtMagMeasTime[21];
+
+            // rotate predicted earth components into body axes and calculate
+            // predicted measurments
+            DCM.x.x = q0*q0 + q1*q1 - q2*q2 - q3*q3;
+            DCM.x.y = 2*(q1*q2 + q0*q3);
+            DCM.x.z = 2*(q1*q3-q0*q2);
+            DCM.y.x = 2*(q1*q2 - q0*q3);
+            DCM.y.y = q0*q0 - q1*q1 + q2*q2 - q3*q3;
+            DCM.y.z = 2*(q2*q3 + q0*q1);
+            DCM.z.x = 2*(q1*q3 + q0*q2);
+            DCM.z.y = 2*(q2*q3 - q0*q1);
+            DCM.z.z = q0*q0 - q1*q1 - q2*q2 + q3*q3;
+            MagPred[0] = DCM.x.x*magN + DCM.x.y*magE  + DCM.x.z*magD + magXbias;
+            MagPred[1] = DCM.y.x*magN + DCM.y.y*magE  + DCM.y.z*magD + magYbias;
+            MagPred[2] = DCM.z.x*magN + DCM.z.y*magE  + DCM.z.z*magD + magZbias;
+
+            // scale magnetometer observation error with total angular rate
+            R_MAG = sq(magMeasurementSigma) + sq(0.05f*dAngIMU.length()/dtIMU);
+
+            // Calculate observation jacobians
+            SH_MAG[0] = 2*magD*q3 + 2*magE*q2 + 2*magN*q1;
+            SH_MAG[1] = 2*magD*q0 - 2*magE*q1 + 2*magN*q2;
+            SH_MAG[2] = 2*magD*q1 + 2*magE*q0 - 2*magN*q3;
+            SH_MAG[3] = sq(q3);
+            SH_MAG[4] = sq(q2);
+            SH_MAG[5] = sq(q1);
+            SH_MAG[6] = sq(q0);
+            SH_MAG[7] = 2*magN*q0;
+            SH_MAG[8] = 2*magE*q3;
+
+            for (uint8_t i = 0; i < n_states; i++) H_MAG[i] = 0;
+            H_MAG[0] = SH_MAG[7] + SH_MAG[8] - 2*magD*q2;
+            H_MAG[1] = SH_MAG[0];
+            H_MAG[2] = 2*magE*q1 - 2*magD*q0 - 2*magN*q2;
+            H_MAG[3] = SH_MAG[2];
+            H_MAG[16] = SH_MAG[5] - SH_MAG[4] - SH_MAG[3] + SH_MAG[6];
+            H_MAG[17] = 2*q0*q3 + 2*q1*q2;
+            H_MAG[18] = 2*q1*q3 - 2*q0*q2;
+            H_MAG[19] = 1.0f;
+
+            // Calculate Kalman gain
+            float temp = (P[19][19] + R_MAG + P[1][19]*SH_MAG[0] + P[3][19]*SH_MAG[2] - P[16][19]*(SH_MAG[3] + SH_MAG[4] - SH_MAG[5] - SH_MAG[6]) - (2*magD*q0 - 2*magE*q1 + 2*magN*q2)*(P[19][2] + P[1][2]*SH_MAG[0] + P[3][2]*SH_MAG[2] - P[16][2]*(SH_MAG[3] + SH_MAG[4] - SH_MAG[5] - SH_MAG[6]) + P[17][2]*(2*q0*q3 + 2*q1*q2) - P[18][2]*(2*q0*q2 - 2*q1*q3) - P[2][2]*(2*magD*q0 - 2*magE*q1 + 2*magN*q2) + P[0][2]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) + (SH_MAG[7] + SH_MAG[8] - 2*magD*q2)*(P[19][0] + P[1][0]*SH_MAG[0] + P[3][0]*SH_MAG[2] - P[16][0]*(SH_MAG[3] + SH_MAG[4] - SH_MAG[5] - SH_MAG[6]) + P[17][0]*(2*q0*q3 + 2*q1*q2) - P[18][0]*(2*q0*q2 - 2*q1*q3) - P[2][0]*(2*magD*q0 - 2*magE*q1 + 2*magN*q2) + P[0][0]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) + SH_MAG[0]*(P[19][1] + P[1][1]*SH_MAG[0] + P[3][1]*SH_MAG[2] - P[16][1]*(SH_MAG[3] + SH_MAG[4] - SH_MAG[5] - SH_MAG[6]) + P[17][1]*(2*q0*q3 + 2*q1*q2) - P[18][1]*(2*q0*q2 - 2*q1*q3) - P[2][1]*(2*magD*q0 - 2*magE*q1 + 2*magN*q2) + P[0][1]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) + SH_MAG[2]*(P[19][3] + P[1][3]*SH_MAG[0] + P[3][3]*SH_MAG[2] - P[16][3]*(SH_MAG[3] + SH_MAG[4] - SH_MAG[5] - SH_MAG[6]) + P[17][3]*(2*q0*q3 + 2*q1*q2) - P[18][3]*(2*q0*q2 - 2*q1*q3) - P[2][3]*(2*magD*q0 - 2*magE*q1 + 2*magN*q2) + P[0][3]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) - (SH_MAG[3] + SH_MAG[4] - SH_MAG[5] - SH_MAG[6])*(P[19][16] + P[1][16]*SH_MAG[0] + P[3][16]*SH_MAG[2] - P[16][16]*(SH_MAG[3] + SH_MAG[4] - SH_MAG[5] - SH_MAG[6]) + P[17][16]*(2*q0*q3 + 2*q1*q2) - P[18][16]*(2*q0*q2 - 2*q1*q3) - P[2][16]*(2*magD*q0 - 2*magE*q1 + 2*magN*q2) + P[0][16]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) + P[17][19]*(2*q0*q3 + 2*q1*q2) - P[18][19]*(2*q0*q2 - 2*q1*q3) - P[2][19]*(2*magD*q0 - 2*magE*q1 + 2*magN*q2) + (2*q0*q3 + 2*q1*q2)*(P[19][17] + P[1][17]*SH_MAG[0] + P[3][17]*SH_MAG[2] - P[16][17]*(SH_MAG[3] + SH_MAG[4] - SH_MAG[5] - SH_MAG[6]) + P[17][17]*(2*q0*q3 + 2*q1*q2) - P[18][17]*(2*q0*q2 - 2*q1*q3) - P[2][17]*(2*magD*q0 - 2*magE*q1 + 2*magN*q2) + P[0][17]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) - (2*q0*q2 - 2*q1*q3)*(P[19][18] + P[1][18]*SH_MAG[0] + P[3][18]*SH_MAG[2] - P[16][18]*(SH_MAG[3] + SH_MAG[4] - SH_MAG[5] - SH_MAG[6]) + P[17][18]*(2*q0*q3 + 2*q1*q2) - P[18][18]*(2*q0*q2 - 2*q1*q3) - P[2][18]*(2*magD*q0 - 2*magE*q1 + 2*magN*q2) + P[0][18]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) + P[0][19]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2));
+            if (temp >= R_MAG) {
+                SK_MX[0] = 1.0f / temp;
+            } else {
+                // the calculation is badly conditioned, so we cannot perform fusion on this step
+                // we increase the state variances and try again next time
+                P[19][19] += 0.1f*R_MAG;
+                obsIndex = 1;
+                return;
+            }
+            SK_MX[1] = SH_MAG[3] + SH_MAG[4] - SH_MAG[5] - SH_MAG[6];
+            SK_MX[2] = 2*magD*q0 - 2*magE*q1 + 2*magN*q2;
+            SK_MX[3] = SH_MAG[7] + SH_MAG[8] - 2*magD*q2;
+            SK_MX[4] = 2*q0*q2 - 2*q1*q3;
+            SK_MX[5] = 2*q0*q3 + 2*q1*q2;
+            Kfusion[0] = SK_MX[0]*(P[0][19] + P[0][1]*SH_MAG[0] + P[0][3]*SH_MAG[2] + P[0][0]*SK_MX[3] - P[0][2]*SK_MX[2] - P[0][16]*SK_MX[1] + P[0][17]*SK_MX[5] - P[0][18]*SK_MX[4]);
+            Kfusion[1] = SK_MX[0]*(P[1][19] + P[1][1]*SH_MAG[0] + P[1][3]*SH_MAG[2] + P[1][0]*SK_MX[3] - P[1][2]*SK_MX[2] - P[1][16]*SK_MX[1] + P[1][17]*SK_MX[5] - P[1][18]*SK_MX[4]);
+            Kfusion[2] = SK_MX[0]*(P[2][19] + P[2][1]*SH_MAG[0] + P[2][3]*SH_MAG[2] + P[2][0]*SK_MX[3] - P[2][2]*SK_MX[2] - P[2][16]*SK_MX[1] + P[2][17]*SK_MX[5] - P[2][18]*SK_MX[4]);
+            Kfusion[3] = SK_MX[0]*(P[3][19] + P[3][1]*SH_MAG[0] + P[3][3]*SH_MAG[2] + P[3][0]*SK_MX[3] - P[3][2]*SK_MX[2] - P[3][16]*SK_MX[1] + P[3][17]*SK_MX[5] - P[3][18]*SK_MX[4]);
+            Kfusion[4] = SK_MX[0]*(P[4][19] + P[4][1]*SH_MAG[0] + P[4][3]*SH_MAG[2] + P[4][0]*SK_MX[3] - P[4][2]*SK_MX[2] - P[4][16]*SK_MX[1] + P[4][17]*SK_MX[5] - P[4][18]*SK_MX[4]);
+            Kfusion[5] = SK_MX[0]*(P[5][19] + P[5][1]*SH_MAG[0] + P[5][3]*SH_MAG[2] + P[5][0]*SK_MX[3] - P[5][2]*SK_MX[2] - P[5][16]*SK_MX[1] + P[5][17]*SK_MX[5] - P[5][18]*SK_MX[4]);
+            Kfusion[6] = SK_MX[0]*(P[6][19] + P[6][1]*SH_MAG[0] + P[6][3]*SH_MAG[2] + P[6][0]*SK_MX[3] - P[6][2]*SK_MX[2] - P[6][16]*SK_MX[1] + P[6][17]*SK_MX[5] - P[6][18]*SK_MX[4]);
+            Kfusion[7] = SK_MX[0]*(P[7][19] + P[7][1]*SH_MAG[0] + P[7][3]*SH_MAG[2] + P[7][0]*SK_MX[3] - P[7][2]*SK_MX[2] - P[7][16]*SK_MX[1] + P[7][17]*SK_MX[5] - P[7][18]*SK_MX[4]);
+            Kfusion[8] = SK_MX[0]*(P[8][19] + P[8][1]*SH_MAG[0] + P[8][3]*SH_MAG[2] + P[8][0]*SK_MX[3] - P[8][2]*SK_MX[2] - P[8][16]*SK_MX[1] + P[8][17]*SK_MX[5] - P[8][18]*SK_MX[4]);
+            Kfusion[9] = SK_MX[0]*(P[9][19] + P[9][1]*SH_MAG[0] + P[9][3]*SH_MAG[2] + P[9][0]*SK_MX[3] - P[9][2]*SK_MX[2] - P[9][16]*SK_MX[1] + P[9][17]*SK_MX[5] - P[9][18]*SK_MX[4]);
+            Kfusion[10] = SK_MX[0]*(P[10][19] + P[10][1]*SH_MAG[0] + P[10][3]*SH_MAG[2] + P[10][0]*SK_MX[3] - P[10][2]*SK_MX[2] - P[10][16]*SK_MX[1] + P[10][17]*SK_MX[5] - P[10][18]*SK_MX[4]);
+            Kfusion[11] = SK_MX[0]*(P[11][19] + P[11][1]*SH_MAG[0] + P[11][3]*SH_MAG[2] + P[11][0]*SK_MX[3] - P[11][2]*SK_MX[2] - P[11][16]*SK_MX[1] + P[11][17]*SK_MX[5] - P[11][18]*SK_MX[4]);
+            Kfusion[12] = SK_MX[0]*(P[12][19] + P[12][1]*SH_MAG[0] + P[12][3]*SH_MAG[2] + P[12][0]*SK_MX[3] - P[12][2]*SK_MX[2] - P[12][16]*SK_MX[1] + P[12][17]*SK_MX[5] - P[12][18]*SK_MX[4]);
+            // Only height measurements are allowed to modify the Z delta velocity bias state. This improves the stability of the estimate
+            Kfusion[13] = 0.0f;//SK_MX[0]*(P[13][19] + P[13][1]*SH_MAG[0] + P[13][3]*SH_MAG[2] + P[13][0]*SK_MX[3] - P[13][2]*SK_MX[2] - P[13][16]*SK_MX[1] + P[13][17]*SK_MX[5] - P[13][18]*SK_MX[4]);
+            Kfusion[14] = SK_MX[0]*(P[14][19] + P[14][1]*SH_MAG[0] + P[14][3]*SH_MAG[2] + P[14][0]*SK_MX[3] - P[14][2]*SK_MX[2] - P[14][16]*SK_MX[1] + P[14][17]*SK_MX[5] - P[14][18]*SK_MX[4]);
+            Kfusion[15] = SK_MX[0]*(P[15][19] + P[15][1]*SH_MAG[0] + P[15][3]*SH_MAG[2] + P[15][0]*SK_MX[3] - P[15][2]*SK_MX[2] - P[15][16]*SK_MX[1] + P[15][17]*SK_MX[5] - P[15][18]*SK_MX[4]);
+            Kfusion[16] = SK_MX[0]*(P[16][19] + P[16][1]*SH_MAG[0] + P[16][3]*SH_MAG[2] + P[16][0]*SK_MX[3] - P[16][2]*SK_MX[2] - P[16][16]*SK_MX[1] + P[16][17]*SK_MX[5] - P[16][18]*SK_MX[4]);
+            Kfusion[17] = SK_MX[0]*(P[17][19] + P[17][1]*SH_MAG[0] + P[17][3]*SH_MAG[2] + P[17][0]*SK_MX[3] - P[17][2]*SK_MX[2] - P[17][16]*SK_MX[1] + P[17][17]*SK_MX[5] - P[17][18]*SK_MX[4]);
+            Kfusion[18] = SK_MX[0]*(P[18][19] + P[18][1]*SH_MAG[0] + P[18][3]*SH_MAG[2] + P[18][0]*SK_MX[3] - P[18][2]*SK_MX[2] - P[18][16]*SK_MX[1] + P[18][17]*SK_MX[5] - P[18][18]*SK_MX[4]);
+            Kfusion[19] = SK_MX[0]*(P[19][19] + P[19][1]*SH_MAG[0] + P[19][3]*SH_MAG[2] + P[19][0]*SK_MX[3] - P[19][2]*SK_MX[2] - P[19][16]*SK_MX[1] + P[19][17]*SK_MX[5] - P[19][18]*SK_MX[4]);
+            Kfusion[20] = SK_MX[0]*(P[20][19] + P[20][1]*SH_MAG[0] + P[20][3]*SH_MAG[2] + P[20][0]*SK_MX[3] - P[20][2]*SK_MX[2] - P[20][16]*SK_MX[1] + P[20][17]*SK_MX[5] - P[20][18]*SK_MX[4]);
+            Kfusion[21] = SK_MX[0]*(P[21][19] + P[21][1]*SH_MAG[0] + P[21][3]*SH_MAG[2] + P[21][0]*SK_MX[3] - P[21][2]*SK_MX[2] - P[21][16]*SK_MX[1] + P[21][17]*SK_MX[5] - P[21][18]*SK_MX[4]);
+            Kfusion[22] = SK_MX[0]*(P[22][19] + P[22][1]*SH_MAG[0] + P[22][3]*SH_MAG[2] + P[22][0]*SK_MX[3] - P[22][2]*SK_MX[2] - P[22][16]*SK_MX[1] + P[22][17]*SK_MX[5] - P[22][18]*SK_MX[4]);
+            varInnovMag[0] = 1.0f/SK_MX[0];
+            innovMag[0] = MagPred[0] - magData.x;
+        }
+        else if (obsIndex == 1) // we are now fusing the Y measurement
+        {
+            // Calculate observation jacobians
+            for (unsigned int i = 0; i < n_states; i++) H_MAG[i] = 0;
+            H_MAG[0] = SH_MAG[2];
+            H_MAG[1] = SH_MAG[1];
+            H_MAG[2] = SH_MAG[0];
+            H_MAG[3] = 2*magD*q2 - SH_MAG[8] - SH_MAG[7];
+            H_MAG[16] = 2*q1*q2 - 2*q0*q3;
+            H_MAG[17] = SH_MAG[4] - SH_MAG[3] - SH_MAG[5] + SH_MAG[6];
+            H_MAG[18] = 2*q0*q1 + 2*q2*q3;
+            H_MAG[20] = 1;
+
+            // Calculate Kalman gain
+            float temp = (P[20][20] + R_MAG + P[0][20]*SH_MAG[2] + P[1][20]*SH_MAG[1] + P[2][20]*SH_MAG[0] - P[17][20]*(SH_MAG[3] - SH_MAG[4] + SH_MAG[5] - SH_MAG[6]) - (2*q0*q3 - 2*q1*q2)*(P[20][16] + P[0][16]*SH_MAG[2] + P[1][16]*SH_MAG[1] + P[2][16]*SH_MAG[0] - P[17][16]*(SH_MAG[3] - SH_MAG[4] + SH_MAG[5] - SH_MAG[6]) - P[16][16]*(2*q0*q3 - 2*q1*q2) + P[18][16]*(2*q0*q1 + 2*q2*q3) - P[3][16]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) + (2*q0*q1 + 2*q2*q3)*(P[20][18] + P[0][18]*SH_MAG[2] + P[1][18]*SH_MAG[1] + P[2][18]*SH_MAG[0] - P[17][18]*(SH_MAG[3] - SH_MAG[4] + SH_MAG[5] - SH_MAG[6]) - P[16][18]*(2*q0*q3 - 2*q1*q2) + P[18][18]*(2*q0*q1 + 2*q2*q3) - P[3][18]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) - (SH_MAG[7] + SH_MAG[8] - 2*magD*q2)*(P[20][3] + P[0][3]*SH_MAG[2] + P[1][3]*SH_MAG[1] + P[2][3]*SH_MAG[0] - P[17][3]*(SH_MAG[3] - SH_MAG[4] + SH_MAG[5] - SH_MAG[6]) - P[16][3]*(2*q0*q3 - 2*q1*q2) + P[18][3]*(2*q0*q1 + 2*q2*q3) - P[3][3]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) - P[16][20]*(2*q0*q3 - 2*q1*q2) + P[18][20]*(2*q0*q1 + 2*q2*q3) + SH_MAG[2]*(P[20][0] + P[0][0]*SH_MAG[2] + P[1][0]*SH_MAG[1] + P[2][0]*SH_MAG[0] - P[17][0]*(SH_MAG[3] - SH_MAG[4] + SH_MAG[5] - SH_MAG[6]) - P[16][0]*(2*q0*q3 - 2*q1*q2) + P[18][0]*(2*q0*q1 + 2*q2*q3) - P[3][0]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) + SH_MAG[1]*(P[20][1] + P[0][1]*SH_MAG[2] + P[1][1]*SH_MAG[1] + P[2][1]*SH_MAG[0] - P[17][1]*(SH_MAG[3] - SH_MAG[4] + SH_MAG[5] - SH_MAG[6]) - P[16][1]*(2*q0*q3 - 2*q1*q2) + P[18][1]*(2*q0*q1 + 2*q2*q3) - P[3][1]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) + SH_MAG[0]*(P[20][2] + P[0][2]*SH_MAG[2] + P[1][2]*SH_MAG[1] + P[2][2]*SH_MAG[0] - P[17][2]*(SH_MAG[3] - SH_MAG[4] + SH_MAG[5] - SH_MAG[6]) - P[16][2]*(2*q0*q3 - 2*q1*q2) + P[18][2]*(2*q0*q1 + 2*q2*q3) - P[3][2]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) - (SH_MAG[3] - SH_MAG[4] + SH_MAG[5] - SH_MAG[6])*(P[20][17] + P[0][17]*SH_MAG[2] + P[1][17]*SH_MAG[1] + P[2][17]*SH_MAG[0] - P[17][17]*(SH_MAG[3] - SH_MAG[4] + SH_MAG[5] - SH_MAG[6]) - P[16][17]*(2*q0*q3 - 2*q1*q2) + P[18][17]*(2*q0*q1 + 2*q2*q3) - P[3][17]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) - P[3][20]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2));
+            if (temp >= R_MAG) {
+                SK_MY[0] = 1.0f / temp;
+            } else {
+                // the calculation is badly conditioned, so we cannot perform fusion on this step
+                // we increase the state variances and try again next time
+                P[20][20] += 0.1f*R_MAG;
+                obsIndex = 2;
+                return;
+            }
+            SK_MY[1] = SH_MAG[3] - SH_MAG[4] + SH_MAG[5] - SH_MAG[6];
+            SK_MY[2] = SH_MAG[7] + SH_MAG[8] - 2*magD*q2;
+            SK_MY[3] = 2*q0*q3 - 2*q1*q2;
+            SK_MY[4] = 2*q0*q1 + 2*q2*q3;
+            Kfusion[0] = SK_MY[0]*(P[0][20] + P[0][0]*SH_MAG[2] + P[0][1]*SH_MAG[1] + P[0][2]*SH_MAG[0] - P[0][3]*SK_MY[2] - P[0][17]*SK_MY[1] - P[0][16]*SK_MY[3] + P[0][18]*SK_MY[4]);
+            Kfusion[1] = SK_MY[0]*(P[1][20] + P[1][0]*SH_MAG[2] + P[1][1]*SH_MAG[1] + P[1][2]*SH_MAG[0] - P[1][3]*SK_MY[2] - P[1][17]*SK_MY[1] - P[1][16]*SK_MY[3] + P[1][18]*SK_MY[4]);
+            Kfusion[2] = SK_MY[0]*(P[2][20] + P[2][0]*SH_MAG[2] + P[2][1]*SH_MAG[1] + P[2][2]*SH_MAG[0] - P[2][3]*SK_MY[2] - P[2][17]*SK_MY[1] - P[2][16]*SK_MY[3] + P[2][18]*SK_MY[4]);
+            Kfusion[3] = SK_MY[0]*(P[3][20] + P[3][0]*SH_MAG[2] + P[3][1]*SH_MAG[1] + P[3][2]*SH_MAG[0] - P[3][3]*SK_MY[2] - P[3][17]*SK_MY[1] - P[3][16]*SK_MY[3] + P[3][18]*SK_MY[4]);
+            Kfusion[4] = SK_MY[0]*(P[4][20] + P[4][0]*SH_MAG[2] + P[4][1]*SH_MAG[1] + P[4][2]*SH_MAG[0] - P[4][3]*SK_MY[2] - P[4][17]*SK_MY[1] - P[4][16]*SK_MY[3] + P[4][18]*SK_MY[4]);
+            Kfusion[5] = SK_MY[0]*(P[5][20] + P[5][0]*SH_MAG[2] + P[5][1]*SH_MAG[1] + P[5][2]*SH_MAG[0] - P[5][3]*SK_MY[2] - P[5][17]*SK_MY[1] - P[5][16]*SK_MY[3] + P[5][18]*SK_MY[4]);
+            Kfusion[6] = SK_MY[0]*(P[6][20] + P[6][0]*SH_MAG[2] + P[6][1]*SH_MAG[1] + P[6][2]*SH_MAG[0] - P[6][3]*SK_MY[2] - P[6][17]*SK_MY[1] - P[6][16]*SK_MY[3] + P[6][18]*SK_MY[4]);
+            Kfusion[7] = SK_MY[0]*(P[7][20] + P[7][0]*SH_MAG[2] + P[7][1]*SH_MAG[1] + P[7][2]*SH_MAG[0] - P[7][3]*SK_MY[2] - P[7][17]*SK_MY[1] - P[7][16]*SK_MY[3] + P[7][18]*SK_MY[4]);
+            Kfusion[8] = SK_MY[0]*(P[8][20] + P[8][0]*SH_MAG[2] + P[8][1]*SH_MAG[1] + P[8][2]*SH_MAG[0] - P[8][3]*SK_MY[2] - P[8][17]*SK_MY[1] - P[8][16]*SK_MY[3] + P[8][18]*SK_MY[4]);
+            Kfusion[9] = SK_MY[0]*(P[9][20] + P[9][0]*SH_MAG[2] + P[9][1]*SH_MAG[1] + P[9][2]*SH_MAG[0] - P[9][3]*SK_MY[2] - P[9][17]*SK_MY[1] - P[9][16]*SK_MY[3] + P[9][18]*SK_MY[4]);
+            Kfusion[10] = SK_MY[0]*(P[10][20] + P[10][0]*SH_MAG[2] + P[10][1]*SH_MAG[1] + P[10][2]*SH_MAG[0] - P[10][3]*SK_MY[2] - P[10][17]*SK_MY[1] - P[10][16]*SK_MY[3] + P[10][18]*SK_MY[4]);
+            Kfusion[11] = SK_MY[0]*(P[11][20] + P[11][0]*SH_MAG[2] + P[11][1]*SH_MAG[1] + P[11][2]*SH_MAG[0] - P[11][3]*SK_MY[2] - P[11][17]*SK_MY[1] - P[11][16]*SK_MY[3] + P[11][18]*SK_MY[4]);
+            Kfusion[12] = SK_MY[0]*(P[12][20] + P[12][0]*SH_MAG[2] + P[12][1]*SH_MAG[1] + P[12][2]*SH_MAG[0] - P[12][3]*SK_MY[2] - P[12][17]*SK_MY[1] - P[12][16]*SK_MY[3] + P[12][18]*SK_MY[4]);
+            // Only height measurements are allowed to modify the Z delta velocity bias state. This improves the stability of the estimate
+            Kfusion[13] = 0.0f;//SK_MY[0]*(P[13][20] + P[13][0]*SH_MAG[2] + P[13][1]*SH_MAG[1] + P[13][2]*SH_MAG[0] - P[13][3]*SK_MY[2] - P[13][17]*SK_MY[1] - P[13][16]*SK_MY[3] + P[13][18]*SK_MY[4]);
+            Kfusion[14] = SK_MY[0]*(P[14][20] + P[14][0]*SH_MAG[2] + P[14][1]*SH_MAG[1] + P[14][2]*SH_MAG[0] - P[14][3]*SK_MY[2] - P[14][17]*SK_MY[1] - P[14][16]*SK_MY[3] + P[14][18]*SK_MY[4]);
+            Kfusion[15] = SK_MY[0]*(P[15][20] + P[15][0]*SH_MAG[2] + P[15][1]*SH_MAG[1] + P[15][2]*SH_MAG[0] - P[15][3]*SK_MY[2] - P[15][17]*SK_MY[1] - P[15][16]*SK_MY[3] + P[15][18]*SK_MY[4]);
+            Kfusion[16] = SK_MY[0]*(P[16][20] + P[16][0]*SH_MAG[2] + P[16][1]*SH_MAG[1] + P[16][2]*SH_MAG[0] - P[16][3]*SK_MY[2] - P[16][17]*SK_MY[1] - P[16][16]*SK_MY[3] + P[16][18]*SK_MY[4]);
+            Kfusion[17] = SK_MY[0]*(P[17][20] + P[17][0]*SH_MAG[2] + P[17][1]*SH_MAG[1] + P[17][2]*SH_MAG[0] - P[17][3]*SK_MY[2] - P[17][17]*SK_MY[1] - P[17][16]*SK_MY[3] + P[17][18]*SK_MY[4]);
+            Kfusion[18] = SK_MY[0]*(P[18][20] + P[18][0]*SH_MAG[2] + P[18][1]*SH_MAG[1] + P[18][2]*SH_MAG[0] - P[18][3]*SK_MY[2] - P[18][17]*SK_MY[1] - P[18][16]*SK_MY[3] + P[18][18]*SK_MY[4]);
+            Kfusion[19] = SK_MY[0]*(P[19][20] + P[19][0]*SH_MAG[2] + P[19][1]*SH_MAG[1] + P[19][2]*SH_MAG[0] - P[19][3]*SK_MY[2] - P[19][17]*SK_MY[1] - P[19][16]*SK_MY[3] + P[19][18]*SK_MY[4]);
+            Kfusion[20] = SK_MY[0]*(P[20][20] + P[20][0]*SH_MAG[2] + P[20][1]*SH_MAG[1] + P[20][2]*SH_MAG[0] - P[20][3]*SK_MY[2] - P[20][17]*SK_MY[1] - P[20][16]*SK_MY[3] + P[20][18]*SK_MY[4]);
+            Kfusion[21] = SK_MY[0]*(P[21][20] + P[21][0]*SH_MAG[2] + P[21][1]*SH_MAG[1] + P[21][2]*SH_MAG[0] - P[21][3]*SK_MY[2] - P[21][17]*SK_MY[1] - P[21][16]*SK_MY[3] + P[21][18]*SK_MY[4]);
+            Kfusion[22] = SK_MY[0]*(P[22][20] + P[22][0]*SH_MAG[2] + P[22][1]*SH_MAG[1] + P[22][2]*SH_MAG[0] - P[22][3]*SK_MY[2] - P[22][17]*SK_MY[1] - P[22][16]*SK_MY[3] + P[22][18]*SK_MY[4]);
+            varInnovMag[1] = 1.0f/SK_MY[0];
+            innovMag[1] = MagPred[1] - magData.y;
+        }
+        else if (obsIndex == 2) // we are now fusing the Z measurement
+        {
+            // Calculate observation jacobians
+            for (uint8_t i = 0; i < n_states; i++) H_MAG[i] = 0;
+            H_MAG[0] = SH_MAG[1];
+            H_MAG[1] = 2*magN*q3 - 2*magE*q0 - 2*magD*q1;
+            H_MAG[2] = SH_MAG[7] + SH_MAG[8] - 2*magD*q2;
+            H_MAG[3] = SH_MAG[0];
+            H_MAG[16] = 2*q0*q2 + 2*q1*q3;
+            H_MAG[17] = 2*q2*q3 - 2*q0*q1;
+            H_MAG[18] = SH_MAG[3] - SH_MAG[4] - SH_MAG[5] + SH_MAG[6];
+            H_MAG[21] = 1;
+
+            // Calculate Kalman gain
+            float temp = (P[21][21] + R_MAG + P[0][21]*SH_MAG[1] + P[3][21]*SH_MAG[0] + P[18][21]*(SH_MAG[3] - SH_MAG[4] - SH_MAG[5] + SH_MAG[6]) - (2*magD*q1 + 2*magE*q0 - 2*magN*q3)*(P[21][1] + P[0][1]*SH_MAG[1] + P[3][1]*SH_MAG[0] + P[18][1]*(SH_MAG[3] - SH_MAG[4] - SH_MAG[5] + SH_MAG[6]) + P[16][1]*(2*q0*q2 + 2*q1*q3) - P[17][1]*(2*q0*q1 - 2*q2*q3) - P[1][1]*(2*magD*q1 + 2*magE*q0 - 2*magN*q3) + P[2][1]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) + (SH_MAG[7] + SH_MAG[8] - 2*magD*q2)*(P[21][2] + P[0][2]*SH_MAG[1] + P[3][2]*SH_MAG[0] + P[18][2]*(SH_MAG[3] - SH_MAG[4] - SH_MAG[5] + SH_MAG[6]) + P[16][2]*(2*q0*q2 + 2*q1*q3) - P[17][2]*(2*q0*q1 - 2*q2*q3) - P[1][2]*(2*magD*q1 + 2*magE*q0 - 2*magN*q3) + P[2][2]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) + SH_MAG[1]*(P[21][0] + P[0][0]*SH_MAG[1] + P[3][0]*SH_MAG[0] + P[18][0]*(SH_MAG[3] - SH_MAG[4] - SH_MAG[5] + SH_MAG[6]) + P[16][0]*(2*q0*q2 + 2*q1*q3) - P[17][0]*(2*q0*q1 - 2*q2*q3) - P[1][0]*(2*magD*q1 + 2*magE*q0 - 2*magN*q3) + P[2][0]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) + SH_MAG[0]*(P[21][3] + P[0][3]*SH_MAG[1] + P[3][3]*SH_MAG[0] + P[18][3]*(SH_MAG[3] - SH_MAG[4] - SH_MAG[5] + SH_MAG[6]) + P[16][3]*(2*q0*q2 + 2*q1*q3) - P[17][3]*(2*q0*q1 - 2*q2*q3) - P[1][3]*(2*magD*q1 + 2*magE*q0 - 2*magN*q3) + P[2][3]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) + (SH_MAG[3] - SH_MAG[4] - SH_MAG[5] + SH_MAG[6])*(P[21][18] + P[0][18]*SH_MAG[1] + P[3][18]*SH_MAG[0] + P[18][18]*(SH_MAG[3] - SH_MAG[4] - SH_MAG[5] + SH_MAG[6]) + P[16][18]*(2*q0*q2 + 2*q1*q3) - P[17][18]*(2*q0*q1 - 2*q2*q3) - P[1][18]*(2*magD*q1 + 2*magE*q0 - 2*magN*q3) + P[2][18]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) + P[16][21]*(2*q0*q2 + 2*q1*q3) - P[17][21]*(2*q0*q1 - 2*q2*q3) - P[1][21]*(2*magD*q1 + 2*magE*q0 - 2*magN*q3) + (2*q0*q2 + 2*q1*q3)*(P[21][16] + P[0][16]*SH_MAG[1] + P[3][16]*SH_MAG[0] + P[18][16]*(SH_MAG[3] - SH_MAG[4] - SH_MAG[5] + SH_MAG[6]) + P[16][16]*(2*q0*q2 + 2*q1*q3) - P[17][16]*(2*q0*q1 - 2*q2*q3) - P[1][16]*(2*magD*q1 + 2*magE*q0 - 2*magN*q3) + P[2][16]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) - (2*q0*q1 - 2*q2*q3)*(P[21][17] + P[0][17]*SH_MAG[1] + P[3][17]*SH_MAG[0] + P[18][17]*(SH_MAG[3] - SH_MAG[4] - SH_MAG[5] + SH_MAG[6]) + P[16][17]*(2*q0*q2 + 2*q1*q3) - P[17][17]*(2*q0*q1 - 2*q2*q3) - P[1][17]*(2*magD*q1 + 2*magE*q0 - 2*magN*q3) + P[2][17]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2)) + P[2][21]*(SH_MAG[7] + SH_MAG[8] - 2*magD*q2));
+            if (temp >= R_MAG) {
+                SK_MZ[0] = 1.0f / temp;
+            } else {
+                // the calculation is badly conditioned, so we cannot perform fusion on this step
+                // we increase the state variances and try again next time
+                P[21][21] += 0.1f*R_MAG;
+                obsIndex = 3;
+                return;
+            }
+            SK_MZ[1] = SH_MAG[3] - SH_MAG[4] - SH_MAG[5] + SH_MAG[6];
+            SK_MZ[2] = 2*magD*q1 + 2*magE*q0 - 2*magN*q3;
+            SK_MZ[3] = SH_MAG[7] + SH_MAG[8] - 2*magD*q2;
+            SK_MZ[4] = 2*q0*q1 - 2*q2*q3;
+            SK_MZ[5] = 2*q0*q2 + 2*q1*q3;
+            Kfusion[0] = SK_MZ[0]*(P[0][21] + P[0][0]*SH_MAG[1] + P[0][3]*SH_MAG[0] - P[0][1]*SK_MZ[2] + P[0][2]*SK_MZ[3] + P[0][18]*SK_MZ[1] + P[0][16]*SK_MZ[5] - P[0][17]*SK_MZ[4]);
+            Kfusion[1] = SK_MZ[0]*(P[1][21] + P[1][0]*SH_MAG[1] + P[1][3]*SH_MAG[0] - P[1][1]*SK_MZ[2] + P[1][2]*SK_MZ[3] + P[1][18]*SK_MZ[1] + P[1][16]*SK_MZ[5] - P[1][17]*SK_MZ[4]);
+            Kfusion[2] = SK_MZ[0]*(P[2][21] + P[2][0]*SH_MAG[1] + P[2][3]*SH_MAG[0] - P[2][1]*SK_MZ[2] + P[2][2]*SK_MZ[3] + P[2][18]*SK_MZ[1] + P[2][16]*SK_MZ[5] - P[2][17]*SK_MZ[4]);
+            Kfusion[3] = SK_MZ[0]*(P[3][21] + P[3][0]*SH_MAG[1] + P[3][3]*SH_MAG[0] - P[3][1]*SK_MZ[2] + P[3][2]*SK_MZ[3] + P[3][18]*SK_MZ[1] + P[3][16]*SK_MZ[5] - P[3][17]*SK_MZ[4]);
+            Kfusion[4] = SK_MZ[0]*(P[4][21] + P[4][0]*SH_MAG[1] + P[4][3]*SH_MAG[0] - P[4][1]*SK_MZ[2] + P[4][2]*SK_MZ[3] + P[4][18]*SK_MZ[1] + P[4][16]*SK_MZ[5] - P[4][17]*SK_MZ[4]);
+            Kfusion[5] = SK_MZ[0]*(P[5][21] + P[5][0]*SH_MAG[1] + P[5][3]*SH_MAG[0] - P[5][1]*SK_MZ[2] + P[5][2]*SK_MZ[3] + P[5][18]*SK_MZ[1] + P[5][16]*SK_MZ[5] - P[5][17]*SK_MZ[4]);
+            Kfusion[6] = SK_MZ[0]*(P[6][21] + P[6][0]*SH_MAG[1] + P[6][3]*SH_MAG[0] - P[6][1]*SK_MZ[2] + P[6][2]*SK_MZ[3] + P[6][18]*SK_MZ[1] + P[6][16]*SK_MZ[5] - P[6][17]*SK_MZ[4]);
+            Kfusion[7] = SK_MZ[0]*(P[7][21] + P[7][0]*SH_MAG[1] + P[7][3]*SH_MAG[0] - P[7][1]*SK_MZ[2] + P[7][2]*SK_MZ[3] + P[7][18]*SK_MZ[1] + P[7][16]*SK_MZ[5] - P[7][17]*SK_MZ[4]);
+            Kfusion[8] = SK_MZ[0]*(P[8][21] + P[8][0]*SH_MAG[1] + P[8][3]*SH_MAG[0] - P[8][1]*SK_MZ[2] + P[8][2]*SK_MZ[3] + P[8][18]*SK_MZ[1] + P[8][16]*SK_MZ[5] - P[8][17]*SK_MZ[4]);
+            Kfusion[9] = SK_MZ[0]*(P[9][21] + P[9][0]*SH_MAG[1] + P[9][3]*SH_MAG[0] - P[9][1]*SK_MZ[2] + P[9][2]*SK_MZ[3] + P[9][18]*SK_MZ[1] + P[9][16]*SK_MZ[5] - P[9][17]*SK_MZ[4]);
+            Kfusion[10] = SK_MZ[0]*(P[10][21] + P[10][0]*SH_MAG[1] + P[10][3]*SH_MAG[0] - P[10][1]*SK_MZ[2] + P[10][2]*SK_MZ[3] + P[10][18]*SK_MZ[1] + P[10][16]*SK_MZ[5] - P[10][17]*SK_MZ[4]);
+            Kfusion[11] = SK_MZ[0]*(P[11][21] + P[11][0]*SH_MAG[1] + P[11][3]*SH_MAG[0] - P[11][1]*SK_MZ[2] + P[11][2]*SK_MZ[3] + P[11][18]*SK_MZ[1] + P[11][16]*SK_MZ[5] - P[11][17]*SK_MZ[4]);
+            Kfusion[12] = SK_MZ[0]*(P[12][21] + P[12][0]*SH_MAG[1] + P[12][3]*SH_MAG[0] - P[12][1]*SK_MZ[2] + P[12][2]*SK_MZ[3] + P[12][18]*SK_MZ[1] + P[12][16]*SK_MZ[5] - P[12][17]*SK_MZ[4]);
+            // Only height measurements are allowed to modify the Z delta velocity bias state. This improves the stability of the estimate
+            Kfusion[13] = 0.0f;//SK_MZ[0]*(P[13][21] + P[13][0]*SH_MAG[1] + P[13][3]*SH_MAG[0] - P[13][1]*SK_MZ[2] + P[13][2]*SK_MZ[3] + P[13][18]*SK_MZ[1] + P[13][16]*SK_MZ[5] - P[13][17]*SK_MZ[4]);
+            Kfusion[14] = SK_MZ[0]*(P[14][21] + P[14][0]*SH_MAG[1] + P[14][3]*SH_MAG[0] - P[14][1]*SK_MZ[2] + P[14][2]*SK_MZ[3] + P[14][18]*SK_MZ[1] + P[14][16]*SK_MZ[5] - P[14][17]*SK_MZ[4]);
+            Kfusion[15] = SK_MZ[0]*(P[15][21] + P[15][0]*SH_MAG[1] + P[15][3]*SH_MAG[0] - P[15][1]*SK_MZ[2] + P[15][2]*SK_MZ[3] + P[15][18]*SK_MZ[1] + P[15][16]*SK_MZ[5] - P[15][17]*SK_MZ[4]);
+            Kfusion[16] = SK_MZ[0]*(P[16][21] + P[16][0]*SH_MAG[1] + P[16][3]*SH_MAG[0] - P[16][1]*SK_MZ[2] + P[16][2]*SK_MZ[3] + P[16][18]*SK_MZ[1] + P[16][16]*SK_MZ[5] - P[16][17]*SK_MZ[4]);
+            Kfusion[17] = SK_MZ[0]*(P[17][21] + P[17][0]*SH_MAG[1] + P[17][3]*SH_MAG[0] - P[17][1]*SK_MZ[2] + P[17][2]*SK_MZ[3] + P[17][18]*SK_MZ[1] + P[17][16]*SK_MZ[5] - P[17][17]*SK_MZ[4]);
+            Kfusion[18] = SK_MZ[0]*(P[18][21] + P[18][0]*SH_MAG[1] + P[18][3]*SH_MAG[0] - P[18][1]*SK_MZ[2] + P[18][2]*SK_MZ[3] + P[18][18]*SK_MZ[1] + P[18][16]*SK_MZ[5] - P[18][17]*SK_MZ[4]);
+            Kfusion[19] = SK_MZ[0]*(P[19][21] + P[19][0]*SH_MAG[1] + P[19][3]*SH_MAG[0] - P[19][1]*SK_MZ[2] + P[19][2]*SK_MZ[3] + P[19][18]*SK_MZ[1] + P[19][16]*SK_MZ[5] - P[19][17]*SK_MZ[4]);
+            Kfusion[20] = SK_MZ[0]*(P[20][21] + P[20][0]*SH_MAG[1] + P[20][3]*SH_MAG[0] - P[20][1]*SK_MZ[2] + P[20][2]*SK_MZ[3] + P[20][18]*SK_MZ[1] + P[20][16]*SK_MZ[5] - P[20][17]*SK_MZ[4]);
+            Kfusion[21] = SK_MZ[0]*(P[21][21] + P[21][0]*SH_MAG[1] + P[21][3]*SH_MAG[0] - P[21][1]*SK_MZ[2] + P[21][2]*SK_MZ[3] + P[21][18]*SK_MZ[1] + P[21][16]*SK_MZ[5] - P[21][17]*SK_MZ[4]);
+            Kfusion[22] = SK_MZ[0]*(P[22][21] + P[22][0]*SH_MAG[1] + P[22][3]*SH_MAG[0] - P[22][1]*SK_MZ[2] + P[22][2]*SK_MZ[3] + P[22][18]*SK_MZ[1] + P[22][16]*SK_MZ[5] - P[22][17]*SK_MZ[4]);
+            varInnovMag[2] = 1.0f/SK_MZ[0];
+            innovMag[2] = MagPred[2] - magData.z;
+
+        }
+
+        // Check the innovation for consistency and don't fuse if > 5Sigma
+        if ((innovMag[obsIndex]*innovMag[obsIndex]/varInnovMag[obsIndex]) < 25.0f)
+        {
+            // correct the state vector
+            for (uint8_t j= 0; j < indexLimit; j++)
+            {
+                states[j] = states[j] - Kfusion[j] * innovMag[obsIndex];
+            }
+            // normalise the quaternion states
+            float quatMag = sqrt(states[0]*states[0] + states[1]*states[1] + states[2]*states[2] + states[3]*states[3]);
+            if (quatMag > 1e-12f)
+            {
+                for (uint8_t j= 0; j<=3; j++)
+                {
+                    float quatMagInv = 1.0f/quatMag;
+                    states[j] = states[j] * quatMagInv;
+                }
+            }
+            // correct the covariance P = (I - K*H)*P
+            // take advantage of the empty columns in KH to reduce the
+            // number of operations
+            for (uint8_t i = 0; i < indexLimit; i++)
+            {
+                for (uint8_t j = 0; j <= 3; j++)
+                {
+                    KH[i][j] = Kfusion[i] * H_MAG[j];
+                }
+                for (uint8_t j = 4; j <= 15; j++) KH[i][j] = 0.0f;
+                if (!onGround)
+                {
+                    for (uint8_t j = 16; j <= 21; j++)
+                    {
+                        KH[i][j] = Kfusion[i] * H_MAG[j];
+                    }
+                }
+                else
+                {
+                    for (uint8_t j = 16; j <= 21; j++)
+                    {
+                        KH[i][j] = 0.0f;
+                    }
+                }
+            }
+            for (uint8_t i = 0; i < indexLimit; i++)
+            {
+                for (uint8_t j = 0; j < indexLimit; j++)
+                {
+                    KHP[i][j] = 0.0f;
+                    for (uint8_t k = 0; k <= 3; k++)
+                    {
+                        KHP[i][j] = KHP[i][j] + KH[i][k] * P[k][j];
+                    }
+                    if (!onGround)
+                    {
+                        for (uint8_t k = 16; k<=21; k++)
+                        {
+                            KHP[i][j] = KHP[i][j] + KH[i][k] * P[k][j];
+                        }
+                    }
+                }
+            }
+        }
+        for (uint8_t i = 0; i < indexLimit; i++)
+        {
+            for (uint8_t j = 0; j < indexLimit; j++)
+            {
+                P[i][j] = P[i][j] - KHP[i][j];
+            }
+        }
+    }
+    obsIndex = obsIndex + 1;
+
+    ForceSymmetry();
+    ConstrainVariances();
+}
+
+void AttPosEKF::FuseAirspeed()
+{
+    float vn;
+    float ve;
+    float vd;
+    float vwn;
+    float vwe;
+    float R_TAS = sq(airspeedMeasurementSigma);
+    float SH_TAS[3];
+    float SK_TAS;
+    float VtasPred;
+
+    // Copy required states to local variable names
+    vn = statesAtVtasMeasTime[4];
+    ve = statesAtVtasMeasTime[5];
+    vd = statesAtVtasMeasTime[6];
+    vwn = statesAtVtasMeasTime[14];
+    vwe = statesAtVtasMeasTime[15];
+
+    // Need to check that it is flying before fusing airspeed data
+    // Calculate the predicted airspeed
+    VtasPred = sqrtf((ve - vwe)*(ve - vwe) + (vn - vwn)*(vn - vwn) + vd*vd);
+    // Perform fusion of True Airspeed measurement
+    if (useAirspeed && fuseVtasData && (VtasPred > 1.0f) && (VtasMeas > 8.0f))
+    {
+        // Calculate observation jacobians
+        SH_TAS[0] = 1/(sqrt(sq(ve - vwe) + sq(vn - vwn) + sq(vd)));
+        SH_TAS[1] = (SH_TAS[0]*(2.0f*ve - 2*vwe))/2.0f;
+        SH_TAS[2] = (SH_TAS[0]*(2.0f*vn - 2*vwn))/2.0f;
+
+        float H_TAS[n_states];
+        for (uint8_t i = 0; i < n_states; i++) H_TAS[i] = 0.0f;
+        H_TAS[4] = SH_TAS[2];
+        H_TAS[5] = SH_TAS[1];
+        H_TAS[6] = vd*SH_TAS[0];
+        H_TAS[14] = -SH_TAS[2];
+        H_TAS[15] = -SH_TAS[1];
+
+        // Calculate Kalman gains
+        float temp = (R_TAS + SH_TAS[2]*(P[4][4]*SH_TAS[2] + P[5][4]*SH_TAS[1] - P[14][4]*SH_TAS[2] - P[15][4]*SH_TAS[1] + P[6][4]*vd*SH_TAS[0]) + SH_TAS[1]*(P[4][5]*SH_TAS[2] + P[5][5]*SH_TAS[1] - P[14][5]*SH_TAS[2] - P[15][5]*SH_TAS[1] + P[6][5]*vd*SH_TAS[0]) - SH_TAS[2]*(P[4][14]*SH_TAS[2] + P[5][14]*SH_TAS[1] - P[14][14]*SH_TAS[2] - P[15][14]*SH_TAS[1] + P[6][14]*vd*SH_TAS[0]) - SH_TAS[1]*(P[4][15]*SH_TAS[2] + P[5][15]*SH_TAS[1] - P[14][15]*SH_TAS[2] - P[15][15]*SH_TAS[1] + P[6][15]*vd*SH_TAS[0]) + vd*SH_TAS[0]*(P[4][6]*SH_TAS[2] + P[5][6]*SH_TAS[1] - P[14][6]*SH_TAS[2] - P[15][6]*SH_TAS[1] + P[6][6]*vd*SH_TAS[0]));
+        if (temp >= R_TAS) {
+            SK_TAS = 1.0f / temp;
+        } else {
+            // the calculation is badly conditioned, so we cannot perform fusion on this step
+            // we increase the wind state variances and try again next time
+            P[14][14] += 0.05f*R_TAS;
+            P[15][15] += 0.05f*R_TAS;
+            return;
+        }
+        Kfusion[0] = SK_TAS*(P[0][4]*SH_TAS[2] - P[0][14]*SH_TAS[2] + P[0][5]*SH_TAS[1] - P[0][15]*SH_TAS[1] + P[0][6]*vd*SH_TAS[0]);
+        Kfusion[1] = SK_TAS*(P[1][4]*SH_TAS[2] - P[1][14]*SH_TAS[2] + P[1][5]*SH_TAS[1] - P[1][15]*SH_TAS[1] + P[1][6]*vd*SH_TAS[0]);
+        Kfusion[2] = SK_TAS*(P[2][4]*SH_TAS[2] - P[2][14]*SH_TAS[2] + P[2][5]*SH_TAS[1] - P[2][15]*SH_TAS[1] + P[2][6]*vd*SH_TAS[0]);
+        Kfusion[3] = SK_TAS*(P[3][4]*SH_TAS[2] - P[3][14]*SH_TAS[2] + P[3][5]*SH_TAS[1] - P[3][15]*SH_TAS[1] + P[3][6]*vd*SH_TAS[0]);
+        Kfusion[4] = SK_TAS*(P[4][4]*SH_TAS[2] - P[4][14]*SH_TAS[2] + P[4][5]*SH_TAS[1] - P[4][15]*SH_TAS[1] + P[4][6]*vd*SH_TAS[0]);
+        Kfusion[5] = SK_TAS*(P[5][4]*SH_TAS[2] - P[5][14]*SH_TAS[2] + P[5][5]*SH_TAS[1] - P[5][15]*SH_TAS[1] + P[5][6]*vd*SH_TAS[0]);
+        Kfusion[6] = SK_TAS*(P[6][4]*SH_TAS[2] - P[6][14]*SH_TAS[2] + P[6][5]*SH_TAS[1] - P[6][15]*SH_TAS[1] + P[6][6]*vd*SH_TAS[0]);
+        Kfusion[7] = SK_TAS*(P[7][4]*SH_TAS[2] - P[7][14]*SH_TAS[2] + P[7][5]*SH_TAS[1] - P[7][15]*SH_TAS[1] + P[7][6]*vd*SH_TAS[0]);
+        Kfusion[8] = SK_TAS*(P[8][4]*SH_TAS[2] - P[8][14]*SH_TAS[2] + P[8][5]*SH_TAS[1] - P[8][15]*SH_TAS[1] + P[8][6]*vd*SH_TAS[0]);
+        Kfusion[9] = SK_TAS*(P[9][4]*SH_TAS[2] - P[9][14]*SH_TAS[2] + P[9][5]*SH_TAS[1] - P[9][15]*SH_TAS[1] + P[9][6]*vd*SH_TAS[0]);
+        Kfusion[10] = SK_TAS*(P[10][4]*SH_TAS[2] - P[10][14]*SH_TAS[2] + P[10][5]*SH_TAS[1] - P[10][15]*SH_TAS[1] + P[10][6]*vd*SH_TAS[0]);
+        Kfusion[11] = SK_TAS*(P[11][4]*SH_TAS[2] - P[11][14]*SH_TAS[2] + P[11][5]*SH_TAS[1] - P[11][15]*SH_TAS[1] + P[11][6]*vd*SH_TAS[0]);
+        Kfusion[12] = SK_TAS*(P[12][4]*SH_TAS[2] - P[12][14]*SH_TAS[2] + P[12][5]*SH_TAS[1] - P[12][15]*SH_TAS[1] + P[12][6]*vd*SH_TAS[0]);
+        // Only height measurements are allowed to modify the Z delta velocity bias state. This improves the stability of the estimate
+        Kfusion[13] = 0.0f;//SK_TAS*(P[13][4]*SH_TAS[2] - P[13][14]*SH_TAS[2] + P[13][5]*SH_TAS[1] - P[13][15]*SH_TAS[1] + P[13][6]*vd*SH_TAS[0]);
+        Kfusion[14] = SK_TAS*(P[14][4]*SH_TAS[2] - P[14][14]*SH_TAS[2] + P[14][5]*SH_TAS[1] - P[14][15]*SH_TAS[1] + P[14][6]*vd*SH_TAS[0]);
+        Kfusion[15] = SK_TAS*(P[15][4]*SH_TAS[2] - P[15][14]*SH_TAS[2] + P[15][5]*SH_TAS[1] - P[15][15]*SH_TAS[1] + P[15][6]*vd*SH_TAS[0]);
+        Kfusion[16] = SK_TAS*(P[16][4]*SH_TAS[2] - P[16][14]*SH_TAS[2] + P[16][5]*SH_TAS[1] - P[16][15]*SH_TAS[1] + P[16][6]*vd*SH_TAS[0]);
+        Kfusion[17] = SK_TAS*(P[17][4]*SH_TAS[2] - P[17][14]*SH_TAS[2] + P[17][5]*SH_TAS[1] - P[17][15]*SH_TAS[1] + P[17][6]*vd*SH_TAS[0]);
+        Kfusion[18] = SK_TAS*(P[18][4]*SH_TAS[2] - P[18][14]*SH_TAS[2] + P[18][5]*SH_TAS[1] - P[18][15]*SH_TAS[1] + P[18][6]*vd*SH_TAS[0]);
+        Kfusion[19] = SK_TAS*(P[19][4]*SH_TAS[2] - P[19][14]*SH_TAS[2] + P[19][5]*SH_TAS[1] - P[19][15]*SH_TAS[1] + P[19][6]*vd*SH_TAS[0]);
+        Kfusion[20] = SK_TAS*(P[20][4]*SH_TAS[2] - P[20][14]*SH_TAS[2] + P[20][5]*SH_TAS[1] - P[20][15]*SH_TAS[1] + P[20][6]*vd*SH_TAS[0]);
+        Kfusion[21] = SK_TAS*(P[21][4]*SH_TAS[2] - P[21][14]*SH_TAS[2] + P[21][5]*SH_TAS[1] - P[21][15]*SH_TAS[1] + P[21][6]*vd*SH_TAS[0]);
+        Kfusion[22] = SK_TAS*(P[22][4]*SH_TAS[2] - P[22][14]*SH_TAS[2] + P[22][5]*SH_TAS[1] - P[22][15]*SH_TAS[1] + P[22][6]*vd*SH_TAS[0]);
+        varInnovVtas = 1.0f/SK_TAS;
+
+        // Calculate the measurement innovation
+        innovVtas = VtasPred - VtasMeas;
+        // Check the innovation for consistency and don't fuse if > 5Sigma
+        if ((innovVtas*innovVtas*SK_TAS) < 25.0f)
+        {
+            // correct the state vector
+            for (uint8_t j=0; j <= 22; j++)
+            {
+                states[j] = states[j] - Kfusion[j] * innovVtas;
+            }
+            // normalise the quaternion states
+            float quatMag = sqrt(states[0]*states[0] + states[1]*states[1] + states[2]*states[2] + states[3]*states[3]);
+            if (quatMag > 1e-12f)
+            {
+                for (uint8_t j= 0; j <= 3; j++)
+                {
+                    float quatMagInv = 1.0f/quatMag;
+                    states[j] = states[j] * quatMagInv;
+                }
+            }
+            // correct the covariance P = (I - K*H)*P
+            // take advantage of the empty columns in H to reduce the
+            // number of operations
+            for (uint8_t i = 0; i <= 22; i++)
+            {
+                for (uint8_t j = 0; j <= 3; j++) KH[i][j] = 0.0;
+                for (uint8_t j = 4; j <= 6; j++)
+                {
+                    KH[i][j] = Kfusion[i] * H_TAS[j];
+                }
+                for (uint8_t j = 7; j <= 13; j++) KH[i][j] = 0.0;
+                for (uint8_t j = 14; j <= 15; j++)
+                {
+                    KH[i][j] = Kfusion[i] * H_TAS[j];
+                }
+                for (uint8_t j = 16; j <= 22; j++) KH[i][j] = 0.0;
+            }
+            for (uint8_t i = 0; i <= 22; i++)
+            {
+                for (uint8_t j = 0; j <= 22; j++)
+                {
+                    KHP[i][j] = 0.0;
+                    for (uint8_t k = 4; k <= 6; k++)
+                    {
+                        KHP[i][j] = KHP[i][j] + KH[i][k] * P[k][j];
+                    }
+                    for (uint8_t k = 14; k <= 15; k++)
+                    {
+                        KHP[i][j] = KHP[i][j] + KH[i][k] * P[k][j];
+                    }
+                }
+            }
+            for (uint8_t i = 0; i <= 22; i++)
+            {
+                for (uint8_t j = 0; j <= 22; j++)
+                {
+                    P[i][j] = P[i][j] - KHP[i][j];
+                }
+            }
+        }
+    }
+
+    ForceSymmetry();
+    ConstrainVariances();
+}
+
+void AttPosEKF::zeroRows(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last)
+{
+    uint8_t row;
+    uint8_t col;
+    for (row=first; row<=last; row++)
+    {
+        for (col=0; col<n_states; col++)
+        {
+            covMat[row][col] = 0.0;
+        }
+    }
+}
+
+void AttPosEKF::FuseRangeFinder()
+{
+
+    // Local variables
+    float rngPred;
+    float SH_RNG[5];
+    float H_RNG[23];
+    float SK_RNG[6];
+    float cosRngTilt;
+    const float R_RNG = 0.25f; // 0.5 m2 rangefinder measurement variance
+
+    // Copy required states to local variable names
+    float q0 = statesAtRngTime[0];
+    float q1 = statesAtRngTime[1];
+    float q2 = statesAtRngTime[2];
+    float q3 = statesAtRngTime[3];
+    float pd = statesAtRngTime[9];
+    float ptd = statesAtRngTime[22];
+
+    // Need to check that our range finder tilt angle is less than 30 degrees and we are using range finder data
+    SH_RNG[4] = sin(rngFinderPitch);
+    cosRngTilt = - Tbn.z.x * SH_RNG[4] + Tbn.z.z * cosf(rngFinderPitch);
+    if (useRangeFinder && cosRngTilt > 0.87f)
+    {
+        // Calculate observation jacobian and Kalman gain ignoring all states other than the terrain offset
+        // This prevents the range finder measurement modifying any of the other filter states and significantly reduces computations
+        SH_RNG[0] = SH_RNG[4]*(2*q0*q2 - 2*q1*q3) - sq(q0) + sq(q1) + sq(q2) - sq(q3);
+        SH_RNG[1] = pd - ptd;
+        SH_RNG[2] = 1/sq(SH_RNG[0]);
+        SH_RNG[3] = 1/SH_RNG[0];
+        for (uint8_t i = 0; i < n_states; i++) {
+            H_RNG[i] = 0.0f;
+            Kfusion[i] = 0.0f;
+        }
+        H_RNG[22] = -SH_RNG[3];
+        SK_RNG[0] = 1/(R_RNG + SH_RNG[3]*(P[9][9]*SH_RNG[3] - P[22][9]*SH_RNG[3] + P[0][9]*SH_RNG[1]*SH_RNG[2]*(2*q0 - 2*q2*SH_RNG[4]) - P[1][9]*SH_RNG[1]*SH_RNG[2]*(2*q1 - 2*q3*SH_RNG[4]) - P[2][9]*SH_RNG[1]*SH_RNG[2]*(2*q2 + 2*q0*SH_RNG[4]) + P[3][9]*SH_RNG[1]*SH_RNG[2]*(2*q3 + 2*q1*SH_RNG[4])) - SH_RNG[3]*(P[9][22]*SH_RNG[3] - P[22][22]*SH_RNG[3] + P[0][22]*SH_RNG[1]*SH_RNG[2]*(2*q0 - 2*q2*SH_RNG[4]) - P[1][22]*SH_RNG[1]*SH_RNG[2]*(2*q1 - 2*q3*SH_RNG[4]) - P[2][22]*SH_RNG[1]*SH_RNG[2]*(2*q2 + 2*q0*SH_RNG[4]) + P[3][22]*SH_RNG[1]*SH_RNG[2]*(2*q3 + 2*q1*SH_RNG[4])) + SH_RNG[1]*SH_RNG[2]*(2*q0 - 2*q2*SH_RNG[4])*(P[9][0]*SH_RNG[3] - P[22][0]*SH_RNG[3] + P[0][0]*SH_RNG[1]*SH_RNG[2]*(2*q0 - 2*q2*SH_RNG[4]) - P[1][0]*SH_RNG[1]*SH_RNG[2]*(2*q1 - 2*q3*SH_RNG[4]) - P[2][0]*SH_RNG[1]*SH_RNG[2]*(2*q2 + 2*q0*SH_RNG[4]) + P[3][0]*SH_RNG[1]*SH_RNG[2]*(2*q3 + 2*q1*SH_RNG[4])) - SH_RNG[1]*SH_RNG[2]*(2*q1 - 2*q3*SH_RNG[4])*(P[9][1]*SH_RNG[3] - P[22][1]*SH_RNG[3] + P[0][1]*SH_RNG[1]*SH_RNG[2]*(2*q0 - 2*q2*SH_RNG[4]) - P[1][1]*SH_RNG[1]*SH_RNG[2]*(2*q1 - 2*q3*SH_RNG[4]) - P[2][1]*SH_RNG[1]*SH_RNG[2]*(2*q2 + 2*q0*SH_RNG[4]) + P[3][1]*SH_RNG[1]*SH_RNG[2]*(2*q3 + 2*q1*SH_RNG[4])) - SH_RNG[1]*SH_RNG[2]*(2*q2 + 2*q0*SH_RNG[4])*(P[9][2]*SH_RNG[3] - P[22][2]*SH_RNG[3] + P[0][2]*SH_RNG[1]*SH_RNG[2]*(2*q0 - 2*q2*SH_RNG[4]) - P[1][2]*SH_RNG[1]*SH_RNG[2]*(2*q1 - 2*q3*SH_RNG[4]) - P[2][2]*SH_RNG[1]*SH_RNG[2]*(2*q2 + 2*q0*SH_RNG[4]) + P[3][2]*SH_RNG[1]*SH_RNG[2]*(2*q3 + 2*q1*SH_RNG[4])) + SH_RNG[1]*SH_RNG[2]*(2*q3 + 2*q1*SH_RNG[4])*(P[9][3]*SH_RNG[3] - P[22][3]*SH_RNG[3] + P[0][3]*SH_RNG[1]*SH_RNG[2]*(2*q0 - 2*q2*SH_RNG[4]) - P[1][3]*SH_RNG[1]*SH_RNG[2]*(2*q1 - 2*q3*SH_RNG[4]) - P[2][3]*SH_RNG[1]*SH_RNG[2]*(2*q2 + 2*q0*SH_RNG[4]) + P[3][3]*SH_RNG[1]*SH_RNG[2]*(2*q3 + 2*q1*SH_RNG[4])));
+        SK_RNG[1] = 2*q1 - 2*q3*SH_RNG[4];
+        SK_RNG[2] = 2*q0 - 2*q2*SH_RNG[4];
+        SK_RNG[3] = 2*q3 + 2*q1*SH_RNG[4];
+        SK_RNG[4] = 2*q2 + 2*q0*SH_RNG[4];
+        SK_RNG[5] = SH_RNG[2];
+        Kfusion[22] = SK_RNG[0]*(P[22][9]*SH_RNG[3] - P[22][22]*SH_RNG[3] + P[22][0]*SH_RNG[1]*SK_RNG[2]*SK_RNG[5] - P[22][1]*SH_RNG[1]*SK_RNG[1]*SK_RNG[5] - P[22][2]*SH_RNG[1]*SK_RNG[4]*SK_RNG[5] + P[22][3]*SH_RNG[1]*SK_RNG[3]*SK_RNG[5]);
+
+        // Calculate the measurement innovation
+        rngPred = (ptd - pd)/cosRngTilt;
+        innovRng = rngPred - rngMea;
+        //printf("mea=%5.1f, pred=%5.1f, pd=%5.1f, ptd=%5.2f\n", rngMea, rngPred, pd, ptd);
+
+        // Check the innovation for consistency and don't fuse if > 5Sigma
+        if ((innovRng*innovRng*SK_RNG[0]) < 25)
+        {
+            // correct the state vector
+            states[22] = states[22] - Kfusion[22] * innovRng;
+
+            // correct the covariance P = (I - K*H)*P
+            P[22][22] = P[22][22] - Kfusion[22] * H_RNG[22] * P[22][22];
+            P[22][22] = ConstrainFloat(P[22][22], 0.0f, 10000.0f);
+        }
+    }
+
+}
+
+void AttPosEKF::zeroCols(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last)
+{
+    uint8_t row;
+    uint8_t col;
+    for (col=first; col<=last; col++)
+    {
+        for (row=0; row < n_states; row++)
+        {
+            covMat[row][col] = 0.0;
+        }
+    }
+}
+
+float AttPosEKF::sq(float valIn)
+{
+    return valIn*valIn;
+}
+
+// Store states in a history array along with time stamp
+void AttPosEKF::StoreStates(uint64_t timestamp_ms)
+{
+    for (unsigned i=0; i<n_states; i++)
+        storedStates[i][storeIndex] = states[i];
+    statetimeStamp[storeIndex] = timestamp_ms;
+    storeIndex++;
+    if (storeIndex == data_buffer_size)
+        storeIndex = 0;
+}
+
+void AttPosEKF::ResetStoredStates()
+{
+    // reset all stored states
+    memset(&storedStates[0][0], 0, sizeof(storedStates));
+    memset(&statetimeStamp[0], 0, sizeof(statetimeStamp));
+
+    // reset store index to first
+    storeIndex = 0;
+
+    // overwrite all existing states
+    for (unsigned i = 0; i < n_states; i++) {
+        storedStates[i][storeIndex] = states[i];
+    }
+
+    statetimeStamp[storeIndex] = millis();
+
+    // increment to next storage index
+    storeIndex++;
+}
+
+// Output the state vector stored at the time that best matches that specified by msec
+int AttPosEKF::RecallStates(float* statesForFusion, uint64_t msec)
+{
+    int ret = 0;
+
+    int64_t bestTimeDelta = 200;
+    unsigned bestStoreIndex = 0;
+    for (unsigned storeIndexLocal = 0; storeIndexLocal < data_buffer_size; storeIndexLocal++)
+    {
+        // Work around a GCC compiler bug - we know 64bit support on ARM is
+        // sketchy in GCC.
+        uint64_t timeDelta;
+
+        if (msec > statetimeStamp[storeIndexLocal]) {
+            timeDelta = msec - statetimeStamp[storeIndexLocal];
+        } else {
+            timeDelta = statetimeStamp[storeIndexLocal] - msec;
+        }
+
+        if (timeDelta < (uint64_t)bestTimeDelta)
+        {
+            bestStoreIndex = storeIndexLocal;
+            bestTimeDelta = timeDelta;
+        }
+    }
+    if (bestTimeDelta < 200) // only output stored state if < 200 msec retrieval error
+    {
+        for (unsigned i=0; i < n_states; i++) {
+            if (isfinite(storedStates[i][bestStoreIndex])) {
+                statesForFusion[i] = storedStates[i][bestStoreIndex];
+            } else if (isfinite(states[i])) {
+                statesForFusion[i] = states[i];
+            } else {
+                // There is not much we can do here, except reporting the error we just
+                // found.
+                ret++;
+            }
+        }
+    }
+    else // otherwise output current state
+    {
+        for (unsigned i = 0; i < n_states; i++) {
+            if (isfinite(states[i])) {
+                statesForFusion[i] = states[i];
+            } else {
+                ret++;
+            }
+        }
+    }
+
+    return ret;
+}
+
+void AttPosEKF::quat2Tnb(Mat3f &Tnb, const float (&quat)[4])
+{
+    // Calculate the nav to body cosine matrix
+    float q00 = sq(quat[0]);
+    float q11 = sq(quat[1]);
+    float q22 = sq(quat[2]);
+    float q33 = sq(quat[3]);
+    float q01 =  quat[0]*quat[1];
+    float q02 =  quat[0]*quat[2];
+    float q03 =  quat[0]*quat[3];
+    float q12 =  quat[1]*quat[2];
+    float q13 =  quat[1]*quat[3];
+    float q23 =  quat[2]*quat[3];
+
+    Tnb.x.x = q00 + q11 - q22 - q33;
+    Tnb.y.y = q00 - q11 + q22 - q33;
+    Tnb.z.z = q00 - q11 - q22 + q33;
+    Tnb.y.x = 2*(q12 - q03);
+    Tnb.z.x = 2*(q13 + q02);
+    Tnb.x.y = 2*(q12 + q03);
+    Tnb.z.y = 2*(q23 - q01);
+    Tnb.x.z = 2*(q13 - q02);
+    Tnb.y.z = 2*(q23 + q01);
+}
+
+void AttPosEKF::quat2Tbn(Mat3f &Tbn_ret, const float (&quat)[4])
+{
+    // Calculate the body to nav cosine matrix
+    float q00 = sq(quat[0]);
+    float q11 = sq(quat[1]);
+    float q22 = sq(quat[2]);
+    float q33 = sq(quat[3]);
+    float q01 =  quat[0]*quat[1];
+    float q02 =  quat[0]*quat[2];
+    float q03 =  quat[0]*quat[3];
+    float q12 =  quat[1]*quat[2];
+    float q13 =  quat[1]*quat[3];
+    float q23 =  quat[2]*quat[3];
+
+    Tbn_ret.x.x = q00 + q11 - q22 - q33;
+    Tbn_ret.y.y = q00 - q11 + q22 - q33;
+    Tbn_ret.z.z = q00 - q11 - q22 + q33;
+    Tbn_ret.x.y = 2*(q12 - q03);
+    Tbn_ret.x.z = 2*(q13 + q02);
+    Tbn_ret.y.x = 2*(q12 + q03);
+    Tbn_ret.y.z = 2*(q23 - q01);
+    Tbn_ret.z.x = 2*(q13 - q02);
+    Tbn_ret.z.y = 2*(q23 + q01);
+}
+
+void AttPosEKF::eul2quat(float (&quat)[4], const float (&eul)[3])
+{
+    float u1 = cos(0.5f*eul[0]);
+    float u2 = cos(0.5f*eul[1]);
+    float u3 = cos(0.5f*eul[2]);
+    float u4 = sin(0.5f*eul[0]);
+    float u5 = sin(0.5f*eul[1]);
+    float u6 = sin(0.5f*eul[2]);
+    quat[0] = u1*u2*u3+u4*u5*u6;
+    quat[1] = u4*u2*u3-u1*u5*u6;
+    quat[2] = u1*u5*u3+u4*u2*u6;
+    quat[3] = u1*u2*u6-u4*u5*u3;
+}
+
+void AttPosEKF::quat2eul(float (&y)[3], const float (&u)[4])
+{
+    y[0] = atan2f((2.0f*(u[2]*u[3]+u[0]*u[1])) , (u[0]*u[0]-u[1]*u[1]-u[2]*u[2]+u[3]*u[3]));
+    y[1] = -asinf(2.0f*(u[1]*u[3]-u[0]*u[2]));
+    y[2] = atan2f((2.0f*(u[1]*u[2]+u[0]*u[3])) , (u[0]*u[0]+u[1]*u[1]-u[2]*u[2]-u[3]*u[3]));
+}
+
+void AttPosEKF::calcvelNED(float (&velNED)[3], float gpsCourse, float gpsGndSpd, float gpsVelD)
+{
+    velNED[0] = gpsGndSpd*cosf(gpsCourse);
+    velNED[1] = gpsGndSpd*sinf(gpsCourse);
+    velNED[2] = gpsVelD;
+}
+
+void AttPosEKF::calcposNED(float (&posNED)[3], double lat, double lon, float hgt, double latReference, double lonReference, float hgtReference)
+{
+    posNED[0] = earthRadius * (lat - latReference);
+    posNED[1] = earthRadius * cos(latReference) * (lon - lonReference);
+    posNED[2] = -(hgt - hgtReference);
+}
+
+void AttPosEKF::calcLLH(float posNED[3], double &lat, double &lon, float &hgt, double latRef, double lonRef, float hgtRef)
+{
+    lat = latRef + (double)posNED[0] * earthRadiusInv;
+    lon = lonRef + (double)posNED[1] * earthRadiusInv / cos(latRef);
+    hgt = hgtRef - posNED[2];
+}
+
+void AttPosEKF::OnGroundCheck()
+{
+    onGround = (((sq(velNED[0]) + sq(velNED[1]) + sq(velNED[2])) < 4.0f) && (VtasMeas < 6.0f));
+    if (staticMode) {
+        staticMode = (!refSet || (GPSstatus < GPS_FIX_3D));
+    }
+}
+
+void AttPosEKF::calcEarthRateNED(Vector3f &omega, float latitude)
+{
+    //Define Earth rotation vector in the NED navigation frame
+    omega.x  = earthRate*cosf(latitude);
+    omega.y  = 0.0f;
+    omega.z  = -earthRate*sinf(latitude);
+}
+
+void AttPosEKF::CovarianceInit()
+{
+    // Calculate the initial covariance matrix P
+    P[0][0]   = 0.25f * sq(1.0f*deg2rad);
+    P[1][1]   = 0.25f * sq(1.0f*deg2rad);
+    P[2][2]   = 0.25f * sq(1.0f*deg2rad);
+    P[3][3]   = 0.25f * sq(10.0f*deg2rad);
+    P[4][4]   = sq(0.7f);
+    P[5][5]   = P[4][4];
+    P[6][6]   = sq(0.7f);
+    P[7][7]   = sq(15.0f);
+    P[8][8]   = P[7][7];
+    P[9][9]   = sq(5.0f);
+    P[10][10] = sq(0.1f*deg2rad*dtIMU);
+    P[11][11] = P[10][10];
+    P[12][12] = P[10][10];
+    P[13][13] = sq(0.2f*dtIMU);
+    P[14][14] = sq(8.0f);
+    P[15][14]  = P[14][14];
+    P[16][16] = sq(0.02f);
+    P[17][17] = P[16][16];
+    P[18][18] = P[16][16];
+    P[19][19] = sq(0.02f);
+    P[20][20] = P[19][19];
+    P[21][21] = P[19][19];
+    P[22][22] = sq(0.5f);
+}
+
+float AttPosEKF::ConstrainFloat(float val, float min, float max)
+{
+    float ret;
+    if (val > max) {
+        ret = max;
+        ekf_debug("> max: %8.4f, val: %8.4f", (double)max, (double)val);
+    } else if (val < min) {
+        ret = min;
+        ekf_debug("< min: %8.4f, val: %8.4f", (double)min, (double)val);
+    } else {
+        ret = val;
+    }
+
+    if (!isfinite(val)) {
+        ekf_debug("constrain: non-finite!");
+    }
+
+    return ret;
+}
+
+void AttPosEKF::ConstrainVariances()
+{
+    if (!numericalProtection) {
+        return;
+    }
+
+    // State vector:
+    // 0-3: quaternions (q0, q1, q2, q3)
+    // 4-6: Velocity - m/sec (North, East, Down)
+    // 7-9: Position - m (North, East, Down)
+    // 10-12: Delta Angle bias - rad (X,Y,Z)
+    // 13: Delta Velocity bias - m/s (Z)
+    // 14-15: Wind Vector  - m/sec (North,East)
+    // 16-18: Earth Magnetic Field Vector - gauss (North, East, Down)
+    // 19-21: Body Magnetic Field Vector - gauss (X,Y,Z)
+    // 22: Terrain  offset - m
+
+    // Constrain quaternion variances
+    for (unsigned i = 0; i <= 3; i++) {
+        P[i][i] = ConstrainFloat(P[i][i], 0.0f, 1.0f);
+    }
+
+    // Constrain velocity variances
+    for (unsigned i = 4; i <= 6; i++) {
+        P[i][i] = ConstrainFloat(P[i][i], 0.0f, 1.0e3f);
+    }
+
+    // Constrain position variances
+    for (unsigned i = 7; i <= 9; i++) {
+        P[i][i] = ConstrainFloat(P[i][i], 0.0f, 1.0e6f);
+    }
+
+    // Constrain delta angle bias variances
+    for (unsigned i = 10; i <= 12; i++) {
+        P[i][i] = ConstrainFloat(P[i][i], 0.0f, sq(0.12f * dtIMU));
+    }
+
+    // Constrain delta velocity bias variance
+    P[13][13] = ConstrainFloat(P[13][13], 0.0f, sq(1.0f * dtIMU));
+
+    // Wind velocity variances
+    for (unsigned i = 14; i <= 15; i++) {
+        P[i][i] = ConstrainFloat(P[i][i], 0.0f, 1.0e3f);
+    }
+
+    // Earth magnetic field variances
+    for (unsigned i = 16; i <= 18; i++) {
+        P[i][i] = ConstrainFloat(P[i][i], 0.0f, 1.0f);
+    }
+
+    // Body magnetic field variances
+    for (unsigned i = 19; i <= 21; i++) {
+        P[i][i] = ConstrainFloat(P[i][i], 0.0f, 1.0f);
+    }
+
+    // Constrain terrain offset variance
+    P[22][22] = ConstrainFloat(P[22][22], 0.0f, 10000.0f);
+}
+
+void AttPosEKF::ConstrainStates()
+{
+    if (!numericalProtection) {
+        return;
+    }
+
+    // State vector:
+    // 0-3: quaternions (q0, q1, q2, q3)
+    // 4-6: Velocity - m/sec (North, East, Down)
+    // 7-9: Position - m (North, East, Down)
+    // 10-12: Delta Angle bias - rad (X,Y,Z)
+    // 13: Delta Velocity bias - m/s (Z)
+    // 14-15: Wind Vector  - m/sec (North,East)
+    // 16-18: Earth Magnetic Field Vector - gauss (North, East, Down)
+    // 19-21: Body Magnetic Field Vector - gauss (X,Y,Z)
+    // 22: Terrain  offset - m
+
+    // Constrain quaternion
+    for (unsigned i = 0; i <= 3; i++) {
+        states[i] = ConstrainFloat(states[i], -1.0f, 1.0f);
+    }
+
+    // Constrain velocities to what GPS can do for us
+    for (unsigned i = 4; i <= 6; i++) {
+        states[i] = ConstrainFloat(states[i], -5.0e2f, 5.0e2f);
+    }
+
+    // Constrain position to a reasonable vehicle range (in meters)
+    for (unsigned i = 7; i <= 8; i++) {
+        states[i] = ConstrainFloat(states[i], -1.0e6f, 1.0e6f);
+    }
+
+    // Constrain altitude
+    states[9] = ConstrainFloat(states[9], -4.0e4f, 1.0e4f);
+
+    // Angle bias limit - set to 8 degrees / sec
+    for (unsigned i = 10; i <= 12; i++) {
+        states[i] = ConstrainFloat(states[i], -0.12f * dtIMU, 0.12f * dtIMU);
+    }
+
+    // Constrain delta velocity bias
+    states[13] = ConstrainFloat(states[13], -1.0f * dtIMU, 1.0f * dtIMU);
+
+    // Wind velocity limits - assume 120 m/s max velocity
+    for (unsigned i = 14; i <= 15; i++) {
+        states[i] = ConstrainFloat(states[i], -120.0f, 120.0f);
+    }
+
+    // Earth magnetic field limits (in Gauss)
+    for (unsigned i = 16; i <= 18; i++) {
+        states[i] = ConstrainFloat(states[i], -1.0f, 1.0f);
+    }
+
+    // Body magnetic field variances (in Gauss).
+    // the max offset should be in this range.
+    for (unsigned i = 19; i <= 21; i++) {
+        states[i] = ConstrainFloat(states[i], -0.5f, 0.5f);
+    }
+
+    // Constrain terrain offset
+    states[22] = ConstrainFloat(states[22], -1000.0f, 1000.0f);
+
+}
+
+void AttPosEKF::ForceSymmetry()
+{
+    if (!numericalProtection) {
+        return;
+    }
+
+    // Force symmetry on the covariance matrix to prevent ill-conditioning
+    // of the matrix which would cause the filter to blow-up
+    for (unsigned i = 1; i < n_states; i++)
+    {
+        for (uint8_t j = 0; j < i; j++)
+        {
+            P[i][j] = 0.5f * (P[i][j] + P[j][i]);
+            P[j][i] = P[i][j];
+
+            if ((fabsf(P[i][j]) > EKF_COVARIANCE_DIVERGED) ||
+                (fabsf(P[j][i]) > EKF_COVARIANCE_DIVERGED)) {
+                current_ekf_state.covariancesExcessive = true;
+                current_ekf_state.error |= true;
+                InitializeDynamic(velNED, magDeclination);
+                return;
+            }
+
+            float symmetric = 0.5f * (P[i][j] + P[j][i]);
+            P[i][j] = symmetric;
+            P[j][i] = symmetric;
+        }
+    }
+}
+
+bool AttPosEKF::GyroOffsetsDiverged()
+{
+    // Detect divergence by looking for rapid changes of the gyro offset
+    Vector3f current_bias;
+    current_bias.x = states[10];
+    current_bias.y = states[11];
+    current_bias.z = states[12];
+
+    Vector3f delta = current_bias - lastGyroOffset;
+    float delta_len = delta.length();
+    float delta_len_scaled = 0.0f;
+
+    // Protect against division by zero
+    if (delta_len > 0.0f) {
+        float cov_mag = ConstrainFloat((P[10][10] + P[11][11] + P[12][12]), 1e-12f, 1e-8f);
+        delta_len_scaled = (5e-7 / (double)cov_mag) * (double)delta_len / (double)dtIMU;
+    }
+
+    bool diverged = (delta_len_scaled > 1.0f);
+    lastGyroOffset = current_bias;
+    current_ekf_state.error |= diverged;
+    current_ekf_state.gyroOffsetsExcessive = diverged;
+
+    return diverged;
+}
+
+bool AttPosEKF::VelNEDDiverged()
+{
+    Vector3f current_vel;
+    current_vel.x = states[4];
+    current_vel.y = states[5];
+    current_vel.z = states[6];
+
+    Vector3f gps_vel;
+    gps_vel.x = velNED[0];
+    gps_vel.y = velNED[1];
+    gps_vel.z = velNED[2];
+
+    Vector3f delta = current_vel - gps_vel;
+    float delta_len = delta.length();
+
+    bool excessive = (delta_len > 20.0f);
+
+    current_ekf_state.error |= excessive;
+    current_ekf_state.velOffsetExcessive = excessive;
+
+    return excessive;
+}
+
+bool AttPosEKF::FilterHealthy()
+{
+    if (!statesInitialised) {
+        return false;
+    }
+
+    // XXX Check state vector for NaNs and ill-conditioning
+
+    // Check if any of the major inputs timed out
+    if (current_ekf_state.posTimeout || current_ekf_state.velTimeout || current_ekf_state.hgtTimeout) {
+        return false;
+    }
+
+    // Nothing fired, return ok.
+    return true;
+}
+
+/**
+ * Reset the filter position states
+ *
+ * This resets the position to the last GPS measurement
+ * or to zero in case of static position.
+ */
+void AttPosEKF::ResetPosition(void)
+{
+    if (staticMode) {
+        states[7] = 0;
+        states[8] = 0;
+    } else if (GPSstatus >= GPS_FIX_3D) {
+
+        // reset the states from the GPS measurements
+        states[7] = posNE[0];
+        states[8] = posNE[1];
+    }
+}
+
+/**
+ * Reset the height state.
+ *
+ * This resets the height state with the last altitude measurements
+ */
+void AttPosEKF::ResetHeight(void)
+{
+    // write to the state vector
+    states[9]   = -hgtMea;
+}
+
+/**
+ * Reset the velocity state.
+ */
+void AttPosEKF::ResetVelocity(void)
+{
+    if (staticMode) {
+        states[4] = 0.0f;
+        states[5] = 0.0f;
+        states[6] = 0.0f;
+    } else if (GPSstatus >= GPS_FIX_3D) {
+
+        states[4]  = velNED[0]; // north velocity from last reading
+        states[5]  = velNED[1]; // east velocity from last reading
+        states[6]  = velNED[2]; // down velocity from last reading
+    }
+}
+
+bool AttPosEKF::StatesNaN() {
+    bool err = false;
+
+    // check all integrators
+    if (!isfinite(summedDelAng.x) || !isfinite(summedDelAng.y) || !isfinite(summedDelAng.z)) {
+        current_ekf_state.angNaN = true;
+        ekf_debug("summedDelAng NaN: x: %f y: %f z: %f", (double)summedDelAng.x, (double)summedDelAng.y, (double)summedDelAng.z);
+        err = true;
+        goto out;
+    } // delta angles
+
+    if (!isfinite(correctedDelAng.x) || !isfinite(correctedDelAng.y) || !isfinite(correctedDelAng.z)) {
+        current_ekf_state.angNaN = true;
+        ekf_debug("correctedDelAng NaN: x: %f y: %f z: %f", (double)correctedDelAng.x, (double)correctedDelAng.y, (double)correctedDelAng.z);
+        err = true;
+        goto out;
+    } // delta angles
+
+    if (!isfinite(summedDelVel.x) || !isfinite(summedDelVel.y) || !isfinite(summedDelVel.z)) {
+        current_ekf_state.summedDelVelNaN = true;
+        ekf_debug("summedDelVel NaN: x: %f y: %f z: %f", (double)summedDelVel.x, (double)summedDelVel.y, (double)summedDelVel.z);
+        err = true;
+        goto out;
+    } // delta velocities
+
+    // check all states and covariance matrices
+    for (unsigned i = 0; i < n_states; i++) {
+        for (unsigned j = 0; j < n_states; j++) {
+            if (!isfinite(KH[i][j])) {
+
+                current_ekf_state.KHNaN = true;
+                err = true;
+                ekf_debug("KH NaN");
+                goto out;
+            } //  intermediate result used for covariance updates
+
+            if (!isfinite(KHP[i][j])) {
+
+                current_ekf_state.KHPNaN = true;
+                err = true;
+                ekf_debug("KHP NaN");
+                goto out;
+            } // intermediate result used for covariance updates
+
+            if (!isfinite(P[i][j])) {
+
+                current_ekf_state.covarianceNaN = true;
+                err = true;
+                ekf_debug("P NaN");
+            } // covariance matrix
+        }
+
+        if (!isfinite(Kfusion[i])) {
+
+            current_ekf_state.kalmanGainsNaN = true;
+            ekf_debug("Kfusion NaN");
+            err = true;
+            goto out;
+        } // Kalman gains
+
+        if (!isfinite(states[i])) {
+
+            current_ekf_state.statesNaN = true;
+            ekf_debug("states NaN: i: %u val: %f", i, (double)states[i]);
+            err = true;
+            goto out;
+        } // state matrix
+    }
+
+out:
+    if (err) {
+        current_ekf_state.error |= true;
+    }
+
+    return err;
+
+}
+
+/**
+ * Check the filter inputs and bound its operational state
+ *
+ * This check will reset the filter states if required
+ * due to a failure of consistency or timeout checks.
+ * it should be run after the measurement data has been
+ * updated, but before any of the fusion steps are
+ * executed.
+ */
+int AttPosEKF::CheckAndBound(struct ekf_status_report *last_error)
+{
+
+    // Store the old filter state
+    bool currStaticMode = staticMode;
+
+    // Limit reset rate to 5 Hz to allow the filter
+    // to settle
+    if (millis() - lastReset < 200) {
+        return 0;
+    }
+
+    if (ekfDiverged) {
+        ekfDiverged = false;
+    }
+
+    int ret = 0;
+
+    // Check if we're on ground - this also sets static mode.
+    OnGroundCheck();
+
+    // Reset the filter if the states went NaN
+    if (StatesNaN()) {
+        ekf_debug("re-initializing dynamic");
+
+        // Reset and fill error report
+	    InitializeDynamic(velNED, magDeclination);
+
+        ret = 1;
+    }
+
+    // Reset the filter if the IMU data is too old
+    if (dtIMU > 0.3f) {
+
+        current_ekf_state.imuTimeout = true;
+
+        // Fill error report
+        GetFilterState(&last_ekf_error);
+
+        ResetVelocity();
+        ResetPosition();
+        ResetHeight();
+        ResetStoredStates();
+
+        // Timeout cleared with this reset
+        current_ekf_state.imuTimeout = false;
+
+        // that's all we can do here, return
+        ret = 2;
+    }
+
+    // Check if we switched between states
+    if (currStaticMode != staticMode) {
+        // Fill error report, but not setting error flag
+        GetFilterState(&last_ekf_error);
+
+        ResetVelocity();
+        ResetPosition();
+        ResetHeight();
+        ResetStoredStates();
+
+        ret = 3;
+    }
+
+    // Reset the filter if gyro offsets are excessive
+    if (GyroOffsetsDiverged()) {
+
+        // Reset and fill error report
+        InitializeDynamic(velNED, magDeclination);
+
+        // that's all we can do here, return
+        ret = 4;
+    }
+
+    // Reset the filter if it diverges too far from GPS
+    if (VelNEDDiverged()) {
+
+        // Reset and fill error report
+        InitializeDynamic(velNED, magDeclination);
+
+        // that's all we can do here, return
+        ret = 5;
+    }
+
+    // The excessive covariance detection already
+    // reset the filter. Just need to report here.
+    if (last_ekf_error.covariancesExcessive) {
+        ret = 6;
+    }
+
+    if (ret) {
+        ekfDiverged = true;
+        lastReset = millis();
+
+        // This reads the last error and clears it
+        GetLastErrorState(last_error);
+    }
+
+    return ret;
+}
+
+void AttPosEKF::AttitudeInit(float ax, float ay, float az, float mx, float my, float mz, float declination, float *initQuat)
+{
+    float initialRoll, initialPitch;
+    float cosRoll, sinRoll, cosPitch, sinPitch;
+    float magX, magY;
+    float initialHdg, cosHeading, sinHeading;
+
+    initialRoll = atan2f(-ay, -az);
+    initialPitch = atan2f(ax, -az);
+
+    cosRoll = cosf(initialRoll);
+    sinRoll = sinf(initialRoll);
+    cosPitch = cosf(initialPitch);
+    sinPitch = sinf(initialPitch);
+
+    magX = mx * cosPitch + my * sinRoll * sinPitch + mz * cosRoll * sinPitch;
+
+    magY = my * cosRoll - mz * sinRoll;
+
+    initialHdg = atan2f(-magY, magX);
+    /* true heading is the mag heading minus declination */
+    initialHdg += declination;
+
+    cosRoll = cosf(initialRoll * 0.5f);
+    sinRoll = sinf(initialRoll * 0.5f);
+
+    cosPitch = cosf(initialPitch * 0.5f);
+    sinPitch = sinf(initialPitch * 0.5f);
+
+    cosHeading = cosf(initialHdg * 0.5f);
+    sinHeading = sinf(initialHdg * 0.5f);
+
+    initQuat[0] = cosRoll * cosPitch * cosHeading + sinRoll * sinPitch * sinHeading;
+    initQuat[1] = sinRoll * cosPitch * cosHeading - cosRoll * sinPitch * sinHeading;
+    initQuat[2] = cosRoll * sinPitch * cosHeading + sinRoll * cosPitch * sinHeading;
+    initQuat[3] = cosRoll * cosPitch * sinHeading - sinRoll * sinPitch * cosHeading;
+
+    /* normalize */
+    float norm = sqrtf(initQuat[0]*initQuat[0] + initQuat[1]*initQuat[1] + initQuat[2]*initQuat[2] + initQuat[3]*initQuat[3]);
+
+    initQuat[0] /= norm;
+    initQuat[1] /= norm;
+    initQuat[2] /= norm;
+    initQuat[3] /= norm;
+}
+
+void AttPosEKF::InitializeDynamic(float (&initvelNED)[3], float declination)
+{
+    if (current_ekf_state.error) {
+        GetFilterState(&last_ekf_error);
+    }
+
+    ZeroVariables();
+
+    // Reset error states
+    current_ekf_state.error = false;
+    current_ekf_state.angNaN = false;
+    current_ekf_state.summedDelVelNaN = false;
+    current_ekf_state.KHNaN = false;
+    current_ekf_state.KHPNaN = false;
+    current_ekf_state.PNaN = false;
+    current_ekf_state.covarianceNaN = false;
+    current_ekf_state.kalmanGainsNaN = false;
+    current_ekf_state.statesNaN = false;
+
+    current_ekf_state.velHealth = true;
+    //current_ekf_state.posHealth = ?;
+    //current_ekf_state.hgtHealth = ?;
+    
+    current_ekf_state.velTimeout = false;
+    //current_ekf_state.posTimeout = ?;
+    //current_ekf_state.hgtTimeout = ?;
+
+    // Fill variables with valid data
+    velNED[0] = initvelNED[0];
+    velNED[1] = initvelNED[1];
+    velNED[2] = initvelNED[2];
+    magDeclination = declination;
+
+    // Calculate initial filter quaternion states from raw measurements
+    float initQuat[4];
+    Vector3f initMagXYZ;
+    initMagXYZ   = magData - magBias;
+    AttitudeInit(accel.x, accel.y, accel.z, initMagXYZ.x, initMagXYZ.y, initMagXYZ.z, declination, initQuat);
+
+    // Calculate initial Tbn matrix and rotate Mag measurements into NED
+    // to set initial NED magnetic field states
+    Mat3f DCM;
+    quat2Tbn(DCM, initQuat);
+    Vector3f initMagNED;
+    initMagNED.x = DCM.x.x*initMagXYZ.x + DCM.x.y*initMagXYZ.y + DCM.x.z*initMagXYZ.z;
+    initMagNED.y = DCM.y.x*initMagXYZ.x + DCM.y.y*initMagXYZ.y + DCM.y.z*initMagXYZ.z;
+    initMagNED.z = DCM.z.x*initMagXYZ.x + DCM.z.y*initMagXYZ.y + DCM.z.z*initMagXYZ.z;
+
+    magstate.q0 = initQuat[0];
+    magstate.q1 = initQuat[1];
+    magstate.q2 = initQuat[2];
+    magstate.q3 = initQuat[3];
+    magstate.magN = initMagNED.x;
+    magstate.magE = initMagNED.y;
+    magstate.magD = initMagNED.z;
+    magstate.magXbias = magBias.x;
+    magstate.magYbias = magBias.y;
+    magstate.magZbias = magBias.z;
+    magstate.R_MAG = sq(magMeasurementSigma);
+    magstate.DCM = DCM;
+
+    // write to state vector
+    for (uint8_t j=0; j<=3; j++) states[j] = initQuat[j]; // quaternions
+    for (uint8_t j=4; j<=6; j++) states[j] = initvelNED[j-4]; // velocities
+    // positions:
+    states[7] = posNE[0];
+    states[8] = posNE[1];
+    states[9] = -hgtMea;
+    for (uint8_t j=10; j<=15; j++) states[j] = 0.0f; // dAngBias, dVelBias, windVel
+    states[16] = initMagNED.x; // Magnetic Field North
+    states[17] = initMagNED.y; // Magnetic Field East
+    states[18] = initMagNED.z; // Magnetic Field Down
+    states[19] = magBias.x; // Magnetic Field Bias X
+    states[20] = magBias.y; // Magnetic Field Bias Y
+    states[21] = magBias.z; // Magnetic Field Bias Z
+    states[22] = 0.0f; // terrain height
+
+    ResetVelocity();
+    ResetPosition();
+    ResetHeight();
+
+    statesInitialised = true;
+
+    // initialise the covariance matrix
+    CovarianceInit();
+
+    //Define Earth rotation vector in the NED navigation frame
+    calcEarthRateNED(earthRateNED, latRef);
+
+}
+
+void AttPosEKF::InitialiseFilter(float (&initvelNED)[3], double referenceLat, double referenceLon, float referenceHgt, float declination)
+{
+    // store initial lat,long and height
+    latRef = referenceLat;
+    lonRef = referenceLon;
+    hgtRef = referenceHgt;
+    refSet = true;
+
+    // we are at reference position, so measurement must be zero
+    posNE[0] = 0.0f;
+    posNE[1] = 0.0f;
+
+    // we are at an unknown, possibly non-zero altitude - so altitude
+    // is not reset (hgtMea)
+
+    // the baro offset must be this difference now
+    baroHgtOffset = baroHgt - referenceHgt;
+
+    InitializeDynamic(initvelNED, declination);
+}
+
+void AttPosEKF::ZeroVariables()
+{
+
+    // Initialize on-init initialized variables
+
+    storeIndex = 0;
+
+    // Do the data structure init
+    for (unsigned i = 0; i < n_states; i++) {
+        for (unsigned j = 0; j < n_states; j++) {
+            KH[i][j] = 0.0f; //  intermediate result used for covariance updates
+            KHP[i][j] = 0.0f; // intermediate result used for covariance updates
+            P[i][j] = 0.0f; // covariance matrix
+        }
+
+        Kfusion[i] = 0.0f; // Kalman gains
+        states[i] = 0.0f; // state matrix
+    }
+
+    correctedDelAng.zero();
+    summedDelAng.zero();
+    summedDelVel.zero();
+    lastGyroOffset.zero();
+
+    for (unsigned i = 0; i < data_buffer_size; i++) {
+
+        for (unsigned j = 0; j < n_states; j++) {
+            storedStates[j][i] = 0.0f;
+        }
+
+        statetimeStamp[i] = 0;
+    }
+
+    memset(&magstate, 0, sizeof(magstate));
+    magstate.q0 = 1.0f;
+    magstate.DCM.identity();
+
+    memset(&current_ekf_state, 0, sizeof(current_ekf_state));
+
+}
+
+void AttPosEKF::GetFilterState(struct ekf_status_report *err)
+{
+
+    // Copy states
+    for (unsigned i = 0; i < n_states; i++) {
+        current_ekf_state.states[i] = states[i];
+    }
+    current_ekf_state.n_states = n_states;
+
+    memcpy(err, &current_ekf_state, sizeof(*err));
+
+    // err->velHealth = current_ekf_state.velHealth;
+    // err->posHealth = current_ekf_state.posHealth;
+    // err->hgtHealth = current_ekf_state.hgtHealth;
+    // err->velTimeout = current_ekf_state.velTimeout;
+    // err->posTimeout = current_ekf_state.posTimeout;
+    // err->hgtTimeout = current_ekf_state.hgtTimeout;
+}
+
+void AttPosEKF::GetLastErrorState(struct ekf_status_report *last_error)
+{
+    memcpy(last_error, &last_ekf_error, sizeof(*last_error));
+    memset(&last_ekf_error, 0, sizeof(last_ekf_error));
+}
diff --git a/src/modules/ekf_att_pos_estimator/estimator_23states.h b/src/modules/ekf_att_pos_estimator/estimator_23states.h
new file mode 100644
index 000000000..15ceb57c0
--- /dev/null
+++ b/src/modules/ekf_att_pos_estimator/estimator_23states.h
@@ -0,0 +1,300 @@
+#pragma once
+
+#include "estimator_utilities.h"
+
+const unsigned int n_states = 23;
+const unsigned int data_buffer_size = 50;
+
+class AttPosEKF {
+
+public:
+
+    AttPosEKF();
+    ~AttPosEKF();
+
+
+
+    /* ##############################################
+     *
+     *   M A I N    F I L T E R    P A R A M E T E R S
+     *
+     * ########################################### */
+
+    /*
+     * parameters are defined here and initialised in
+     * the InitialiseParameters() (which is just 20 lines down)
+     */
+
+    float covTimeStepMax; // maximum time allowed between covariance predictions
+    float covDelAngMax; // maximum delta angle between covariance predictions
+    float rngFinderPitch; // pitch angle of laser range finder in radians. Zero is aligned with the Z body axis. Positive is RH rotation about Y body axis.
+
+    float yawVarScale;
+    float windVelSigma;
+    float dAngBiasSigma;
+    float dVelBiasSigma;
+    float magEarthSigma;
+    float magBodySigma;
+    float gndHgtSigma;
+
+    float vneSigma;
+    float vdSigma;
+    float posNeSigma;
+    float posDSigma;
+    float magMeasurementSigma;
+    float airspeedMeasurementSigma;
+
+    float gyroProcessNoise;
+    float accelProcessNoise;
+
+    float EAS2TAS; // ratio f true to equivalent airspeed
+
+    void InitialiseParameters()
+    {
+        covTimeStepMax = 0.07f; // maximum time allowed between covariance predictions
+        covDelAngMax = 0.02f; // maximum delta angle between covariance predictions
+        rngFinderPitch = 0.0f; // pitch angle of laser range finder in radians. Zero is aligned with the Z body axis. Positive is RH rotation about Y body axis.
+        EAS2TAS = 1.0f;
+
+        yawVarScale = 1.0f;
+        windVelSigma = 0.1f;
+        dAngBiasSigma = 5.0e-7f;
+        dVelBiasSigma = 1e-4f;
+        magEarthSigma = 3.0e-4f;
+        magBodySigma  = 3.0e-4f;
+        gndHgtSigma  = 0.02f; // assume 2% terrain gradient 1-sigma
+
+        vneSigma = 0.2f;
+        vdSigma = 0.3f;
+        posNeSigma = 2.0f;
+        posDSigma = 2.0f;
+
+        magMeasurementSigma = 0.05;
+        airspeedMeasurementSigma = 1.4f;
+        gyroProcessNoise = 1.4544411e-2f;
+        accelProcessNoise = 0.5f;
+    }
+
+    struct mag_state_struct {
+        unsigned obsIndex;
+        float MagPred[3];
+        float SH_MAG[9];
+        float q0;
+        float q1;
+        float q2;
+        float q3;
+        float magN;
+        float magE;
+        float magD;
+        float magXbias;
+        float magYbias;
+        float magZbias;
+        float R_MAG;
+        Mat3f DCM;
+    };
+
+    struct mag_state_struct magstate;
+    struct mag_state_struct resetMagState;
+
+
+
+
+    // Global variables
+    float KH[n_states][n_states]; //  intermediate result used for covariance updates
+    float KHP[n_states][n_states]; // intermediate result used for covariance updates
+    float P[n_states][n_states]; // covariance matrix
+    float Kfusion[n_states]; // Kalman gains
+    float states[n_states]; // state matrix
+    float resetStates[n_states];
+    float storedStates[n_states][data_buffer_size]; // state vectors stored for the last 50 time steps
+    uint32_t statetimeStamp[data_buffer_size]; // time stamp for each state vector stored
+
+    float statesAtVelTime[n_states]; // States at the effective measurement time for posNE and velNED measurements
+    float statesAtPosTime[n_states]; // States at the effective measurement time for posNE and velNED measurements
+    float statesAtHgtTime[n_states]; // States at the effective measurement time for the hgtMea measurement
+    float statesAtMagMeasTime[n_states]; // filter satates at the effective measurement time
+    float statesAtVtasMeasTime[n_states]; // filter states at the effective measurement time
+    float statesAtRngTime[n_states]; // filter states at the effective measurement time
+
+    Vector3f correctedDelAng; // delta angles about the xyz body axes corrected for errors (rad)
+    Vector3f correctedDelVel; // delta velocities along the XYZ body axes corrected for errors (m/s)
+    Vector3f summedDelAng; // summed delta angles about the xyz body axes corrected for errors (rad)
+    Vector3f summedDelVel; // summed delta velocities along the XYZ body axes corrected for errors (m/s)
+    float accNavMag; // magnitude of navigation accel (- used to adjust GPS obs variance (m/s^2)
+    Vector3f earthRateNED; // earths angular rate vector in NED (rad/s)
+    Vector3f angRate; // angular rate vector in XYZ body axes measured by the IMU (rad/s)
+    Vector3f lastGyroOffset;    // Last gyro offset
+    Vector3f delAngTotal;
+
+    Mat3f Tbn; // transformation matrix from body to NED coordinates
+    Mat3f Tnb; // transformation amtrix from NED to body coordinates
+
+    Vector3f accel; // acceleration vector in XYZ body axes measured by the IMU (m/s^2)
+    Vector3f dVelIMU;
+    Vector3f dAngIMU;
+    float dtIMU; // time lapsed since the last IMU measurement or covariance update (sec)
+    uint8_t fusionModeGPS; // 0 = GPS outputs 3D velocity, 1 = GPS outputs 2D velocity, 2 = GPS outputs no velocity
+    float innovVelPos[6]; // innovation output
+    float varInnovVelPos[6]; // innovation variance output
+
+    float velNED[3]; // North, East, Down velocity obs (m/s)
+    float accelGPSNED[3];   // Acceleration predicted by GPS in earth frame
+    float posNE[2]; // North, East position obs (m)
+    float hgtMea; //  measured height (m)
+    float baroHgtOffset;        ///< the baro (weather) offset from normalized altitude
+    float rngMea; // Ground distance
+
+    float innovMag[3]; // innovation output
+    float varInnovMag[3]; // innovation variance output
+    Vector3f magData; // magnetometer flux radings in X,Y,Z body axes
+    float innovVtas; // innovation output
+    float innovRng; ///< Range finder innovation
+    float varInnovVtas; // innovation variance output
+    float VtasMeas; // true airspeed measurement (m/s)
+    float magDeclination;       ///< magnetic declination
+    double latRef; // WGS-84 latitude of reference point (rad)
+    double lonRef; // WGS-84 longitude of reference point (rad)
+    float hgtRef; // WGS-84 height of reference point (m)
+    bool refSet;                ///< flag to indicate if the reference position has been set
+    Vector3f magBias; // states representing magnetometer bias vector in XYZ body axes
+    unsigned covSkipCount; // Number of state prediction frames (IMU daya updates to skip before doing the covariance prediction
+
+    // GPS input data variables
+    float gpsCourse;
+    float gpsVelD;
+    double gpsLat;
+    double gpsLon;
+    float gpsHgt;
+    uint8_t GPSstatus;
+
+    // Baro input
+    float baroHgt;
+
+    bool statesInitialised;
+
+    bool fuseVelData; // this boolean causes the posNE and velNED obs to be fused
+    bool fusePosData; // this boolean causes the posNE and velNED obs to be fused
+    bool fuseHgtData; // this boolean causes the hgtMea obs to be fused
+    bool fuseMagData; // boolean true when magnetometer data is to be fused
+    bool fuseVtasData; // boolean true when airspeed data is to be fused
+    bool fuseRngData;   ///< true when range data is fused
+
+    bool onGround;    ///< boolean true when the flight vehicle is on the ground (not flying)
+    bool staticMode;    ///< boolean true if no position feedback is fused
+    bool useAirspeed;    ///< boolean true if airspeed data is being used
+    bool useCompass;    ///< boolean true if magnetometer data is being used
+    bool useRangeFinder;     ///< true when rangefinder is being used
+
+    bool ekfDiverged;
+    uint64_t lastReset;
+
+    struct ekf_status_report current_ekf_state;
+    struct ekf_status_report last_ekf_error;
+
+    bool numericalProtection;
+
+    unsigned storeIndex;
+
+
+void  UpdateStrapdownEquationsNED();
+
+void CovariancePrediction(float dt);
+
+void FuseVelposNED();
+
+void FuseMagnetometer();
+
+void FuseAirspeed();
+
+void FuseRangeFinder();
+
+void FuseOpticalFlow();
+
+void zeroRows(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last);
+
+void zeroCols(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last);
+
+void quatNorm(float (&quatOut)[4], const float quatIn[4]);
+
+// store staes along with system time stamp in msces
+void StoreStates(uint64_t timestamp_ms);
+
+/**
+ * Recall the state vector.
+ *
+ * Recalls the vector stored at closest time to the one specified by msec
+ *
+ * @return zero on success, integer indicating the number of invalid states on failure.
+ *         Does only copy valid states, if the statesForFusion vector was initialized
+ *         correctly by the caller, the result can be safely used, but is a mixture
+ *         time-wise where valid states were updated and invalid remained at the old
+ *         value.
+ */
+int RecallStates(float *statesForFusion, uint64_t msec);
+
+void ResetStoredStates();
+
+void quat2Tbn(Mat3f &TBodyNed, const float (&quat)[4]);
+
+void calcEarthRateNED(Vector3f &omega, float latitude);
+
+static void eul2quat(float (&quat)[4], const float (&eul)[3]);
+
+static void quat2eul(float (&eul)[3], const float (&quat)[4]);
+
+static void calcvelNED(float (&velNED)[3], float gpsCourse, float gpsGndSpd, float gpsVelD);
+
+void calcposNED(float (&posNED)[3], double lat, double lon, float hgt, double latRef, double lonRef, float hgtRef);
+
+static void calcLLH(float posNED[3], double &lat, double &lon, float &hgt, double latRef, double lonRef, float hgtRef);
+
+static void quat2Tnb(Mat3f &Tnb, const float (&quat)[4]);
+
+static float sq(float valIn);
+
+void OnGroundCheck();
+
+void CovarianceInit();
+
+void InitialiseFilter(float (&initvelNED)[3], double referenceLat, double referenceLon, float referenceHgt, float declination);
+
+float ConstrainFloat(float val, float min, float max);
+
+void ConstrainVariances();
+
+void ConstrainStates();
+
+void ForceSymmetry();
+
+int CheckAndBound(struct ekf_status_report *last_error);
+
+void ResetPosition();
+
+void ResetVelocity();
+
+void ZeroVariables();
+
+void GetFilterState(struct ekf_status_report *state);
+
+void GetLastErrorState(struct ekf_status_report *last_error);
+
+bool StatesNaN();
+
+void InitializeDynamic(float (&initvelNED)[3], float declination);
+
+protected:
+
+bool FilterHealthy();
+
+bool GyroOffsetsDiverged();
+
+bool VelNEDDiverged();
+
+void ResetHeight(void);
+
+void AttitudeInit(float ax, float ay, float az, float mx, float my, float mz, float declination, float *initQuat);
+
+};
+
+uint32_t millis();
+
diff --git a/src/modules/ekf_att_pos_estimator/estimator_utilities.cpp b/src/modules/ekf_att_pos_estimator/estimator_utilities.cpp
new file mode 100644
index 000000000..b4767a0d3
--- /dev/null
+++ b/src/modules/ekf_att_pos_estimator/estimator_utilities.cpp
@@ -0,0 +1,139 @@
+
+#include "estimator_utilities.h"
+
+// Define EKF_DEBUG here to enable the debug print calls
+// if the macro is not set, these will be completely
+// optimized out by the compiler.
+//#define EKF_DEBUG
+
+#ifdef EKF_DEBUG
+#include <stdio.h>
+
+static void
+ekf_debug_print(const char *fmt, va_list args)
+{
+    fprintf(stderr, "%s: ", "[ekf]");
+    vfprintf(stderr, fmt, args);
+
+    fprintf(stderr, "\n");
+}
+
+void
+ekf_debug(const char *fmt, ...)
+{
+    va_list args;
+
+    va_start(args, fmt);
+    ekf_debug_print(fmt, args);
+}
+
+#else
+
+void ekf_debug(const char *fmt, ...) { while(0){} }
+#endif
+
+float Vector3f::length(void) const
+{
+    return sqrt(x*x + y*y + z*z);
+}
+
+void Vector3f::zero(void)
+{
+    x = 0.0f;
+    y = 0.0f;
+    z = 0.0f;
+}
+
+Mat3f::Mat3f() {
+    identity();
+}
+
+void Mat3f::identity() {
+    x.x = 1.0f;
+    x.y = 0.0f;
+    x.z = 0.0f;
+
+    y.x = 0.0f;
+    y.y = 1.0f;
+    y.z = 0.0f;
+
+    z.x = 0.0f;
+    z.y = 0.0f;
+    z.z = 1.0f;
+}
+
+Mat3f Mat3f::transpose(void) const
+{
+    Mat3f ret = *this;
+    swap_var(ret.x.y, ret.y.x);
+    swap_var(ret.x.z, ret.z.x);
+    swap_var(ret.y.z, ret.z.y);
+    return ret;
+}
+
+// overload + operator to provide a vector addition
+Vector3f operator+( Vector3f vecIn1, Vector3f vecIn2)
+{
+    Vector3f vecOut;
+    vecOut.x = vecIn1.x + vecIn2.x;
+    vecOut.y = vecIn1.y + vecIn2.y;
+    vecOut.z = vecIn1.z + vecIn2.z;
+    return vecOut;
+}
+
+// overload - operator to provide a vector subtraction
+Vector3f operator-( Vector3f vecIn1, Vector3f vecIn2)
+{
+    Vector3f vecOut;
+    vecOut.x = vecIn1.x - vecIn2.x;
+    vecOut.y = vecIn1.y - vecIn2.y;
+    vecOut.z = vecIn1.z - vecIn2.z;
+    return vecOut;
+}
+
+// overload * operator to provide a matrix vector product
+Vector3f operator*( Mat3f matIn, Vector3f vecIn)
+{
+    Vector3f vecOut;
+    vecOut.x = matIn.x.x*vecIn.x + matIn.x.y*vecIn.y + matIn.x.z*vecIn.z;
+    vecOut.y = matIn.y.x*vecIn.x + matIn.y.y*vecIn.y + matIn.y.z*vecIn.z;
+    vecOut.z = matIn.x.x*vecIn.x + matIn.z.y*vecIn.y + matIn.z.z*vecIn.z;
+    return vecOut;
+}
+
+// overload % operator to provide a vector cross product
+Vector3f operator%( Vector3f vecIn1, Vector3f vecIn2)
+{
+    Vector3f vecOut;
+    vecOut.x = vecIn1.y*vecIn2.z - vecIn1.z*vecIn2.y;
+    vecOut.y = vecIn1.z*vecIn2.x - vecIn1.x*vecIn2.z;
+    vecOut.z = vecIn1.x*vecIn2.y - vecIn1.y*vecIn2.x;
+    return vecOut;
+}
+
+// overload * operator to provide a vector scaler product
+Vector3f operator*(Vector3f vecIn1, float sclIn1)
+{
+    Vector3f vecOut;
+    vecOut.x = vecIn1.x * sclIn1;
+    vecOut.y = vecIn1.y * sclIn1;
+    vecOut.z = vecIn1.z * sclIn1;
+    return vecOut;
+}
+
+// overload * operator to provide a vector scaler product
+Vector3f operator*(float sclIn1, Vector3f vecIn1)
+{
+    Vector3f vecOut;
+    vecOut.x = vecIn1.x * sclIn1;
+    vecOut.y = vecIn1.y * sclIn1;
+    vecOut.z = vecIn1.z * sclIn1;
+    return vecOut;
+}
+
+void swap_var(float &d1, float &d2)
+{
+    float tmp = d1;
+    d1 = d2;
+    d2 = tmp;
+}
diff --git a/src/modules/ekf_att_pos_estimator/estimator_utilities.h b/src/modules/ekf_att_pos_estimator/estimator_utilities.h
new file mode 100644
index 000000000..d47568b62
--- /dev/null
+++ b/src/modules/ekf_att_pos_estimator/estimator_utilities.h
@@ -0,0 +1,82 @@
+#include <math.h>
+#include <stdint.h>
+
+#pragma once
+
+#define GRAVITY_MSS 9.80665f
+#define deg2rad 0.017453292f
+#define rad2deg 57.295780f
+#define pi 3.141592657f
+#define earthRate 0.000072921f
+#define earthRadius 6378145.0
+#define earthRadiusInv  1.5678540e-7
+
+class Vector3f
+{
+private:
+public:
+    float x;
+    float y;
+    float z;
+
+    float length(void) const;
+    void zero(void);
+};
+
+class Mat3f
+{
+private:
+public:
+    Vector3f x;
+    Vector3f y;
+    Vector3f z;
+
+    Mat3f();
+
+    void identity();
+    Mat3f transpose(void) const;
+};
+
+Vector3f operator*(float sclIn1, Vector3f vecIn1);
+Vector3f operator+( Vector3f vecIn1, Vector3f vecIn2);
+Vector3f operator-( Vector3f vecIn1, Vector3f vecIn2);
+Vector3f operator*( Mat3f matIn, Vector3f vecIn);
+Vector3f operator%( Vector3f vecIn1, Vector3f vecIn2);
+Vector3f operator*(Vector3f vecIn1, float sclIn1);
+
+void swap_var(float &d1, float &d2);
+
+enum GPS_FIX {
+    GPS_FIX_NOFIX = 0,
+    GPS_FIX_2D = 2,
+    GPS_FIX_3D = 3
+};
+
+struct ekf_status_report {
+    bool error;
+    bool velHealth;
+    bool posHealth;
+    bool hgtHealth;
+    bool velTimeout;
+    bool posTimeout;
+    bool hgtTimeout;
+    bool imuTimeout;
+    uint32_t velFailTime;
+    uint32_t posFailTime;
+    uint32_t hgtFailTime;
+    float states[32];
+    unsigned n_states;
+    bool angNaN;
+    bool summedDelVelNaN;
+    bool KHNaN;
+    bool KHPNaN;
+    bool PNaN;
+    bool covarianceNaN;
+    bool kalmanGainsNaN;
+    bool statesNaN;
+    bool gyroOffsetsExcessive;
+    bool covariancesExcessive;
+    bool velOffsetExcessive;
+};
+
+void ekf_debug(const char *fmt, ...);
\ No newline at end of file
diff --git a/src/modules/fw_att_pos_estimator/module.mk b/src/modules/ekf_att_pos_estimator/module.mk
index c992959e0..dc5220bf0 100644
--- a/src/modules/fw_att_pos_estimator/module.mk
+++ b/src/modules/ekf_att_pos_estimator/module.mk
@@ -32,11 +32,12 @@
 ############################################################################
 
 #
-# Main Attitude and Position Estimator for Fixed Wing Aircraft
+# Main EKF Attitude and Position Estimator
 #
 
-MODULE_COMMAND	= fw_att_pos_estimator
+MODULE_COMMAND	= ekf_att_pos_estimator
 
-SRCS		= fw_att_pos_estimator_main.cpp \
-		  fw_att_pos_estimator_params.c \
-		  estimator.cpp
+SRCS		= ekf_att_pos_estimator_main.cpp \
+		  ekf_att_pos_estimator_params.c \
+		  estimator_23states.cpp \
+		  estimator_utilities.cpp
diff --git a/src/modules/fixedwing_att_control/fixedwing_att_control_att.c b/src/modules/fixedwing_att_control/fixedwing_att_control_att.c
deleted file mode 100644
index 2aeca3a98..000000000
--- a/src/modules/fixedwing_att_control/fixedwing_att_control_att.c
+++ /dev/null
@@ -1,169 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: @author Thomas Gubler <thomasgubler@student.ethz.ch>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-/**
- * @file fixedwing_att_control_rate.c
- * Implementation of a fixed wing attitude controller.
- */
-
-#include <nuttx/config.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <math.h>
-#include <poll.h>
-#include <time.h>
-#include <drivers/drv_hrt.h>
-#include <arch/board/board.h>
-#include <uORB/uORB.h>
-
-#include <uORB/topics/vehicle_attitude.h>
-#include <uORB/topics/vehicle_attitude_setpoint.h>
-#include <uORB/topics/manual_control_setpoint.h>
-#include <systemlib/param/param.h>
-#include <systemlib/pid/pid.h>
-#include <systemlib/geo/geo.h>
-#include <systemlib/systemlib.h>
-
-#include "fixedwing_att_control_att.h"
-
-
-struct fw_att_control_params {
-	float roll_p;
-	float rollrate_lim;
-	float pitch_p;
-	float pitchrate_lim;
-	float yawrate_lim;
-	float pitch_roll_compensation_p;
-};
-
-struct fw_pos_control_param_handles {
-	param_t roll_p;
-	param_t rollrate_lim;
-	param_t pitch_p;
-	param_t pitchrate_lim;
-	param_t yawrate_lim;
-	param_t pitch_roll_compensation_p;
-};
-
-
-
-/* Internal Prototypes */
-static int parameters_init(struct fw_pos_control_param_handles *h);
-static int parameters_update(const struct fw_pos_control_param_handles *h, struct fw_att_control_params *p);
-
-static int parameters_init(struct fw_pos_control_param_handles *h)
-{
-	/* PID parameters */
-	h->roll_p 		=	param_find("FW_ROLL_P");
-	h->rollrate_lim =	param_find("FW_ROLLR_LIM");
-	h->pitch_p 		=	param_find("FW_PITCH_P");
-	h->pitchrate_lim =	param_find("FW_PITCHR_LIM");
-	h->yawrate_lim =	param_find("FW_YAWR_LIM");
-	h->pitch_roll_compensation_p = param_find("FW_PITCH_RCOMP");
-
-	return OK;
-}
-
-static int parameters_update(const struct fw_pos_control_param_handles *h, struct fw_att_control_params *p)
-{
-	param_get(h->roll_p, &(p->roll_p));
-	param_get(h->rollrate_lim, &(p->rollrate_lim));
-	param_get(h->pitch_p, &(p->pitch_p));
-	param_get(h->pitchrate_lim, &(p->pitchrate_lim));
-	param_get(h->yawrate_lim, &(p->yawrate_lim));
-	param_get(h->pitch_roll_compensation_p, &(p->pitch_roll_compensation_p));
-
-	return OK;
-}
-
-int fixedwing_att_control_attitude(const struct vehicle_attitude_setpoint_s *att_sp,
-				   const struct vehicle_attitude_s *att,
-				   const float speed_body[],
-				   struct vehicle_rates_setpoint_s *rates_sp)
-{
-	static int counter = 0;
-	static bool initialized = false;
-
-	static struct fw_att_control_params p;
-	static struct fw_pos_control_param_handles h;
-
-	static PID_t roll_controller;
-	static PID_t pitch_controller;
-
-
-	if (!initialized) {
-		parameters_init(&h);
-		parameters_update(&h, &p);
-		pid_init(&roll_controller, p.roll_p, 0, 0, 0, p.rollrate_lim, PID_MODE_DERIVATIV_NONE, 0.0f); //P Controller
-		pid_init(&pitch_controller, p.pitch_p, 0, 0, 0, p.pitchrate_lim, PID_MODE_DERIVATIV_NONE, 0.0f); //P Controller
-		initialized = true;
-	}
-
-	/* load new parameters with lower rate */
-	if (counter % 100 == 0) {
-		/* update parameters from storage */
-		parameters_update(&h, &p);
-		pid_set_parameters(&roll_controller, p.roll_p, 0, 0, 0, p.rollrate_lim);
-		pid_set_parameters(&pitch_controller, p.pitch_p, 0, 0, 0, p.pitchrate_lim);
-	}
-
-	/* Roll (P) */
-	rates_sp->roll = pid_calculate(&roll_controller, att_sp->roll_body, att->roll, 0, 0);
-
-
-	/* Pitch (P) */
-
-	/* compensate feedforward for loss of lift due to non-horizontal angle of wing */
-	float pitch_sp_rollcompensation = p.pitch_roll_compensation_p * fabsf(sinf(att_sp->roll_body));
-	/* set pitch plus feedforward roll compensation */
-	rates_sp->pitch = pid_calculate(&pitch_controller,
-					att_sp->pitch_body + pitch_sp_rollcompensation,
-					att->pitch, 0, 0);
-
-	/* Yaw (from coordinated turn constraint or lateral force) */
-	rates_sp->yaw = (att->rollspeed * rates_sp->roll + 9.81f * sinf(att->roll) * cosf(att->pitch) + speed_body[0] * rates_sp->pitch * sinf(att->roll))
-			/ (speed_body[0] * cosf(att->roll) * cosf(att->pitch) + speed_body[2] * sinf(att->pitch));
-
-//	printf("rates_sp->yaw %.4f \n", (double)rates_sp->yaw);
-
-	counter++;
-
-	return 0;
-}
-
-
-
diff --git a/src/modules/fixedwing_att_control/fixedwing_att_control_main.c b/src/modules/fixedwing_att_control/fixedwing_att_control_main.c
deleted file mode 100644
index b6b4546c2..000000000
--- a/src/modules/fixedwing_att_control/fixedwing_att_control_main.c
+++ /dev/null
@@ -1,367 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: 	@author Thomas Gubler <thomasgubler@student.ethz.ch>
- *   			@author Doug Weibel <douglas.weibel@colorado.edu>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-/**
- * @file fixedwing_att_control.c
- * Implementation of a fixed wing attitude controller.
- */
-
-#include <nuttx/config.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <math.h>
-#include <poll.h>
-#include <time.h>
-#include <drivers/drv_hrt.h>
-#include <arch/board/board.h>
-#include <uORB/uORB.h>
-#include <uORB/topics/vehicle_global_position.h>
-#include <uORB/topics/vehicle_global_position_setpoint.h>
-#include <uORB/topics/vehicle_attitude.h>
-#include <uORB/topics/vehicle_control_mode.h>
-#include <uORB/topics/vehicle_status.h>
-#include <uORB/topics/vehicle_attitude_setpoint.h>
-#include <uORB/topics/manual_control_setpoint.h>
-#include <uORB/topics/actuator_controls.h>
-#include <uORB/topics/vehicle_rates_setpoint.h>
-#include <uORB/topics/vehicle_global_position.h>
-#include <uORB/topics/debug_key_value.h>
-#include <systemlib/param/param.h>
-#include <systemlib/pid/pid.h>
-#include <systemlib/geo/geo.h>
-#include <systemlib/perf_counter.h>
-#include <systemlib/systemlib.h>
-
-#include "fixedwing_att_control_rate.h"
-#include "fixedwing_att_control_att.h"
-
-/* Prototypes */
-/**
- * Deamon management function.
- */
-__EXPORT int fixedwing_att_control_main(int argc, char *argv[]);
-
-/**
- * Mainloop of deamon.
- */
-int fixedwing_att_control_thread_main(int argc, char *argv[]);
-
-/**
- * Print the correct usage.
- */
-static void usage(const char *reason);
-
-/* Variables */
-static bool thread_should_exit = false;		/**< Deamon exit flag */
-static bool thread_running = false;		/**< Deamon status flag */
-static int deamon_task;				/**< Handle of deamon task / thread */
-
-/* Main Thread */
-int fixedwing_att_control_thread_main(int argc, char *argv[])
-{
-	/* read arguments */
-	bool verbose = false;
-
-	for (int i = 1; i < argc; i++) {
-		if (strcmp(argv[i], "-v") == 0 || strcmp(argv[i], "--verbose") == 0) {
-			verbose = true;
-		}
-	}
-
-	/* welcome user */
-	printf("[fixedwing att control] started\n");
-
-	/* declare and safely initialize all structs */
-	struct vehicle_attitude_s att;
-	memset(&att, 0, sizeof(att));
-	struct vehicle_attitude_setpoint_s att_sp;
-	memset(&att_sp, 0, sizeof(att_sp));
-	struct vehicle_rates_setpoint_s rates_sp;
-	memset(&rates_sp, 0, sizeof(rates_sp));
-	struct vehicle_global_position_s global_pos;
-	memset(&global_pos, 0, sizeof(global_pos));
-	struct manual_control_setpoint_s manual_sp;
-	memset(&manual_sp, 0, sizeof(manual_sp));
-	struct vehicle_control_mode_s control_mode;
-	memset(&control_mode, 0, sizeof(control_mode));
-	struct vehicle_status_s vstatus;
-	memset(&vstatus, 0, sizeof(vstatus));
-
-	/* output structs */
-	struct actuator_controls_s actuators;
-	memset(&actuators, 0, sizeof(actuators));
-
-
-	/* publish actuator controls */
-	for (unsigned i = 0; i < NUM_ACTUATOR_CONTROLS; i++) {
-		actuators.control[i] = 0.0f;
-	}
-
-	orb_advert_t actuator_pub = orb_advertise(ORB_ID_VEHICLE_ATTITUDE_CONTROLS, &actuators);
-	orb_advert_t rates_pub = orb_advertise(ORB_ID(vehicle_rates_setpoint), &rates_sp);
-
-	/* subscribe */
-	int att_sub = orb_subscribe(ORB_ID(vehicle_attitude));
-	int att_sp_sub = orb_subscribe(ORB_ID(vehicle_attitude_setpoint));
-	int global_pos_sub = orb_subscribe(ORB_ID(vehicle_global_position));
-	int manual_sp_sub = orb_subscribe(ORB_ID(manual_control_setpoint));
-	int control_mode_sub = orb_subscribe(ORB_ID(vehicle_control_mode));
-	int vehicle_status_sub = orb_subscribe(ORB_ID(vehicle_status));
-
-	/* Setup of loop */
-	float gyro[3] = {0.0f, 0.0f, 0.0f};
-	float speed_body[3] = {0.0f, 0.0f, 0.0f};
-	struct pollfd fds = { .fd = att_sub, .events = POLLIN };
-
-	while (!thread_should_exit) {
-		/* wait for a sensor update, check for exit condition every 500 ms */
-		poll(&fds, 1, 500);
-
-		/* Check if there is a new position measurement or  attitude setpoint */
-		bool pos_updated;
-		orb_check(global_pos_sub, &pos_updated);
-		bool att_sp_updated;
-		orb_check(att_sp_sub, &att_sp_updated);
-
-		/* get a local copy of attitude */
-		orb_copy(ORB_ID(vehicle_attitude), att_sub, &att);
-
-		if (att_sp_updated)
-			orb_copy(ORB_ID(vehicle_attitude_setpoint), att_sp_sub, &att_sp);
-
-		if (pos_updated) {
-			orb_copy(ORB_ID(vehicle_global_position), global_pos_sub, &global_pos);
-
-			if (att.R_valid) {
-				speed_body[0] = att.R[0][0] * global_pos.vx + att.R[0][1] * global_pos.vy + att.R[0][2] * global_pos.vz;
-				speed_body[1] = att.R[1][0] * global_pos.vx + att.R[1][1] * global_pos.vy + att.R[1][2] * global_pos.vz;
-				speed_body[2] = att.R[2][0] * global_pos.vx + att.R[2][1] * global_pos.vy + att.R[2][2] * global_pos.vz;
-
-			} else {
-				speed_body[0] = 0;
-				speed_body[1] = 0;
-				speed_body[2] = 0;
-
-				printf("FW ATT CONTROL: Did not get a valid R\n");
-			}
-		}
-
-		orb_copy(ORB_ID(manual_control_setpoint), manual_sp_sub, &manual_sp);
-		orb_copy(ORB_ID(vehicle_control_mode), control_mode_sub, &control_mode);
-		orb_copy(ORB_ID(vehicle_status), vehicle_status_sub, &vstatus);
-
-		gyro[0] = att.rollspeed;
-		gyro[1] = att.pitchspeed;
-		gyro[2] = att.yawspeed;
-
-		/* set manual setpoints if required */
-		if (control_mode.flag_control_manual_enabled) {
-			if (control_mode.flag_control_attitude_enabled) {
-
-				/* if the RC signal is lost, try to stay level and go slowly back down to ground */
-				if (vstatus.rc_signal_lost) {
-
-					/* put plane into loiter */
-					att_sp.roll_body = 0.3f;
-					att_sp.pitch_body = 0.0f;
-
-					/* limit throttle to 60 % of last value if sane */
-					if (isfinite(manual_sp.throttle) &&
-					    (manual_sp.throttle >= 0.0f) &&
-					    (manual_sp.throttle <= 1.0f)) {
-						att_sp.thrust = 0.6f * manual_sp.throttle;
-
-					} else {
-						att_sp.thrust = 0.0f;
-					}
-
-					att_sp.yaw_body = 0;
-
-					// XXX disable yaw control, loiter
-
-				} else {
-
-					att_sp.roll_body = manual_sp.roll;
-					att_sp.pitch_body = manual_sp.pitch;
-					att_sp.yaw_body = 0;
-					att_sp.thrust = manual_sp.throttle;
-				}
-
-				att_sp.timestamp = hrt_absolute_time();
-
-				/* pass through flaps */
-				if (isfinite(manual_sp.flaps)) {
-					actuators.control[4] = manual_sp.flaps;
-
-				} else {
-					actuators.control[4] = 0.0f;
-				}
-
-			} else {
-				/* directly pass through values */
-				actuators.control[0] = manual_sp.roll;
-				/* positive pitch means negative actuator -> pull up */
-				actuators.control[1] = manual_sp.pitch;
-				actuators.control[2] = manual_sp.yaw;
-				actuators.control[3] = manual_sp.throttle;
-
-				if (isfinite(manual_sp.flaps)) {
-					actuators.control[4] = manual_sp.flaps;
-
-				} else {
-					actuators.control[4] = 0.0f;
-				}
-			}
-		}
-		
-		/* execute attitude control if requested */
-		if (control_mode.flag_control_attitude_enabled) {
-			/* attitude control */
-			fixedwing_att_control_attitude(&att_sp, &att, speed_body, &rates_sp);
-
-			/* angular rate control */
-			fixedwing_att_control_rates(&rates_sp, gyro, &actuators);
-
-			/* pass through throttle */
-			actuators.control[3] = att_sp.thrust;
-
-			/* set flaps to zero */
-			actuators.control[4] = 0.0f;
-
-		}
-
-		/* publish rates */
-		orb_publish(ORB_ID(vehicle_rates_setpoint), rates_pub, &rates_sp);
-
-		/* sanity check and publish actuator outputs */
-		if (isfinite(actuators.control[0]) &&
-		    isfinite(actuators.control[1]) &&
-		    isfinite(actuators.control[2]) &&
-		    isfinite(actuators.control[3])) {
-			orb_publish(ORB_ID_VEHICLE_ATTITUDE_CONTROLS, actuator_pub, &actuators);
-		}
-	}
-
-	printf("[fixedwing_att_control] exiting, stopping all motors.\n");
-	thread_running = false;
-
-	/* kill all outputs */
-	for (unsigned i = 0; i < NUM_ACTUATOR_CONTROLS; i++)
-		actuators.control[i] = 0.0f;
-
-	orb_publish(ORB_ID_VEHICLE_ATTITUDE_CONTROLS, actuator_pub, &actuators);
-
-
-
-	close(att_sub);
-	close(actuator_pub);
-	close(rates_pub);
-
-	fflush(stdout);
-	exit(0);
-
-	return 0;
-
-}
-
-/* Startup Functions */
-
-static void
-usage(const char *reason)
-{
-	if (reason)
-		fprintf(stderr, "%s\n", reason);
-
-	fprintf(stderr, "usage: fixedwing_att_control {start|stop|status}\n\n");
-	exit(1);
-}
-
-/**
- * The deamon app only briefly exists to start
- * the background job. The stack size assigned in the
- * Makefile does only apply to this management task.
- *
- * The actual stack size should be set in the call
- * to task_create().
- */
-int fixedwing_att_control_main(int argc, char *argv[])
-{
-	if (argc < 1)
-		usage("missing command");
-
-	if (!strcmp(argv[1], "start")) {
-
-		if (thread_running) {
-			printf("fixedwing_att_control already running\n");
-			/* this is not an error */
-			exit(0);
-		}
-
-		thread_should_exit = false;
-		deamon_task = task_spawn_cmd("fixedwing_att_control",
-					 SCHED_DEFAULT,
-					 SCHED_PRIORITY_MAX - 20,
-					 2048,
-					 fixedwing_att_control_thread_main,
-					 (argv) ? (const char **)&argv[2] : (const char **)NULL);
-		thread_running = true;
-		exit(0);
-	}
-
-	if (!strcmp(argv[1], "stop")) {
-		thread_should_exit = true;
-		exit(0);
-	}
-
-	if (!strcmp(argv[1], "status")) {
-		if (thread_running) {
-			printf("\tfixedwing_att_control is running\n");
-
-		} else {
-			printf("\tfixedwing_att_control not started\n");
-		}
-
-		exit(0);
-	}
-
-	usage("unrecognized command");
-	exit(1);
-}
-
-
-
diff --git a/src/modules/fixedwing_att_control/fixedwing_att_control_rate.c b/src/modules/fixedwing_att_control/fixedwing_att_control_rate.c
deleted file mode 100644
index cdab39edc..000000000
--- a/src/modules/fixedwing_att_control/fixedwing_att_control_rate.c
+++ /dev/null
@@ -1,211 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: Thomas Gubler <thomasgubler@student.ethz.ch>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-/**
- * @file fixedwing_att_control_rate.c
- * @author Thomas Gubler <thomasgubler@student.ethz.ch>
- *
- * Implementation of a fixed wing attitude controller.
- *
- */
-
-#include <nuttx/config.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <math.h>
-#include <poll.h>
-#include <time.h>
-#include <drivers/drv_hrt.h>
-#include <arch/board/board.h>
-#include <uORB/uORB.h>
-
-#include <uORB/topics/vehicle_attitude.h>
-#include <uORB/topics/vehicle_attitude_setpoint.h>
-#include <uORB/topics/manual_control_setpoint.h>
-#include <systemlib/param/param.h>
-#include <systemlib/pid/pid.h>
-#include <systemlib/geo/geo.h>
-#include <systemlib/systemlib.h>
-
-#include "fixedwing_att_control_rate.h"
-
-/*
- * Controller parameters, accessible via MAVLink
- *
- */
-// Roll control parameters
-PARAM_DEFINE_FLOAT(FW_ROLLR_P, 0.9f);
-PARAM_DEFINE_FLOAT(FW_ROLLR_I, 0.2f);
-PARAM_DEFINE_FLOAT(FW_ROLLR_AWU, 0.9f);
-PARAM_DEFINE_FLOAT(FW_ROLLR_LIM, 0.7f);   // Roll rate limit in radians/sec, applies to the roll controller
-PARAM_DEFINE_FLOAT(FW_ROLL_P, 4.0f);
-PARAM_DEFINE_FLOAT(FW_PITCH_RCOMP, 0.1f);
-
-//Pitch control parameters
-PARAM_DEFINE_FLOAT(FW_PITCHR_P, 0.8f);
-PARAM_DEFINE_FLOAT(FW_PITCHR_I, 0.2f);
-PARAM_DEFINE_FLOAT(FW_PITCHR_AWU, 0.8f);
-PARAM_DEFINE_FLOAT(FW_PITCHR_LIM, 0.35f);   // Pitch rate limit in radians/sec, applies to the pitch controller
-PARAM_DEFINE_FLOAT(FW_PITCH_P, 8.0f);
-
-//Yaw control parameters					//XXX TODO this is copy paste, asign correct values
-PARAM_DEFINE_FLOAT(FW_YAWR_P, 0.3f);
-PARAM_DEFINE_FLOAT(FW_YAWR_I, 0.0f);
-PARAM_DEFINE_FLOAT(FW_YAWR_AWU, 0.0f);
-PARAM_DEFINE_FLOAT(FW_YAWR_LIM, 0.35f);   // Yaw rate limit in radians/sec
-
-/* feedforward compensation */
-PARAM_DEFINE_FLOAT(FW_PITCH_THR_P, 0.1f);	/**< throttle to pitch coupling feedforward */
-
-struct fw_rate_control_params {
-	float rollrate_p;
-	float rollrate_i;
-	float rollrate_awu;
-	float pitchrate_p;
-	float pitchrate_i;
-	float pitchrate_awu;
-	float yawrate_p;
-	float yawrate_i;
-	float yawrate_awu;
-	float pitch_thr_ff;
-};
-
-struct fw_rate_control_param_handles {
-	param_t rollrate_p;
-	param_t rollrate_i;
-	param_t rollrate_awu;
-	param_t pitchrate_p;
-	param_t pitchrate_i;
-	param_t pitchrate_awu;
-	param_t yawrate_p;
-	param_t yawrate_i;
-	param_t yawrate_awu;
-	param_t pitch_thr_ff;
-};
-
-
-
-/* Internal Prototypes */
-static int parameters_init(struct fw_rate_control_param_handles *h);
-static int parameters_update(const struct fw_rate_control_param_handles *h, struct fw_rate_control_params *p);
-
-static int parameters_init(struct fw_rate_control_param_handles *h)
-{
-	/* PID parameters */
-	h->rollrate_p 	 =	param_find("FW_ROLLR_P");   //TODO define rate params for fixed wing
-	h->rollrate_i 	 =	param_find("FW_ROLLR_I");
-	h->rollrate_awu  =	param_find("FW_ROLLR_AWU");
-
-	h->pitchrate_p 	 =	param_find("FW_PITCHR_P");
-	h->pitchrate_i 	 =	param_find("FW_PITCHR_I");
-	h->pitchrate_awu =	param_find("FW_PITCHR_AWU");
-
-	h->yawrate_p 	 =	param_find("FW_YAWR_P");
-	h->yawrate_i 	 =	param_find("FW_YAWR_I");
-	h->yawrate_awu   =	param_find("FW_YAWR_AWU");
-	h->pitch_thr_ff  =	param_find("FW_PITCH_THR_P");
-
-	return OK;
-}
-
-static int parameters_update(const struct fw_rate_control_param_handles *h, struct fw_rate_control_params *p)
-{
-	param_get(h->rollrate_p, &(p->rollrate_p));
-	param_get(h->rollrate_i, &(p->rollrate_i));
-	param_get(h->rollrate_awu, &(p->rollrate_awu));
-	param_get(h->pitchrate_p, &(p->pitchrate_p));
-	param_get(h->pitchrate_i, &(p->pitchrate_i));
-	param_get(h->pitchrate_awu, &(p->pitchrate_awu));
-	param_get(h->yawrate_p, &(p->yawrate_p));
-	param_get(h->yawrate_i, &(p->yawrate_i));
-	param_get(h->yawrate_awu, &(p->yawrate_awu));
-	param_get(h->pitch_thr_ff, &(p->pitch_thr_ff));
-
-	return OK;
-}
-
-int fixedwing_att_control_rates(const struct vehicle_rates_setpoint_s *rate_sp,
-				const float rates[],
-				struct actuator_controls_s *actuators)
-{
-	static int counter = 0;
-	static bool initialized = false;
-
-	static struct fw_rate_control_params p;
-	static struct fw_rate_control_param_handles h;
-
-	static PID_t roll_rate_controller;
-	static PID_t pitch_rate_controller;
-	static PID_t yaw_rate_controller;
-
-	static uint64_t last_run = 0;
-	const float deltaT = (hrt_absolute_time() - last_run) / 1000000.0f;
-	last_run = hrt_absolute_time();
-
-	if (!initialized) {
-		parameters_init(&h);
-		parameters_update(&h, &p);
-		pid_init(&roll_rate_controller, p.rollrate_p, p.rollrate_i, 0, p.rollrate_awu, 1, PID_MODE_DERIVATIV_NONE, 0.0f); // set D part to 0 because the controller layout is with a PI rate controller
-		pid_init(&pitch_rate_controller, p.pitchrate_p, p.pitchrate_i, 0, p.pitchrate_awu, 1, PID_MODE_DERIVATIV_NONE, 0.0f); // set D part to 0 because the contpitcher layout is with a PI rate contpitcher
-		pid_init(&yaw_rate_controller, p.yawrate_p, p.yawrate_i, 0, p.yawrate_awu, 1, PID_MODE_DERIVATIV_NONE, 0.0f); // set D part to 0 because the contpitcher layout is with a PI rate contpitcher
-		initialized = true;
-	}
-
-	/* load new parameters with lower rate */
-	if (counter % 100 == 0) {
-		/* update parameters from storage */
-		parameters_update(&h, &p);
-		pid_set_parameters(&roll_rate_controller, p.rollrate_p, p.rollrate_i, 0, p.rollrate_awu, 1);
-		pid_set_parameters(&pitch_rate_controller, p.pitchrate_p, p.pitchrate_i, 0, p.pitchrate_awu, 1);
-		pid_set_parameters(&yaw_rate_controller, p.yawrate_p, p.yawrate_i, 0, p.yawrate_awu, 1);
-	}
-
-
-	/* roll rate (PI) */
-	actuators->control[0] = pid_calculate(&roll_rate_controller, rate_sp->roll, rates[0], 0.0f, deltaT);
-	/* pitch rate (PI) */
-	actuators->control[1] = -pid_calculate(&pitch_rate_controller, rate_sp->pitch, rates[1], 0.0f, deltaT);
-	/* yaw rate (PI) */
-	actuators->control[2] = pid_calculate(&yaw_rate_controller, rate_sp->yaw, rates[2], 0.0f, deltaT);
-
-	counter++;
-
-	return 0;
-}
-
-
-
diff --git a/src/modules/fixedwing_backside/fixedwing.cpp b/src/modules/fixedwing_backside/fixedwing.cpp
index cfae07275..bbb39f20f 100644
--- a/src/modules/fixedwing_backside/fixedwing.cpp
+++ b/src/modules/fixedwing_backside/fixedwing.cpp
@@ -229,8 +229,8 @@ void BlockMultiModeBacksideAutopilot::update()
 		_actuators.control[CH_RDR] = _manual.yaw;
 		_actuators.control[CH_THR] = _manual.throttle;
 
-	} else if (_status.main_state == MAIN_STATE_SEATBELT ||
-		_status.main_state == MAIN_STATE_EASY /* TODO, implement easy */) {
+	} else if (_status.main_state == MAIN_STATE_ALTCTL ||
+		_status.main_state == MAIN_STATE_POSCTL /* TODO, implement pos control */) {
 
 		// calculate velocity, XXX should be airspeed, but using ground speed for now
 		// for the purpose of control we will limit the velocity feedback between
diff --git a/src/modules/fixedwing_pos_control/fixedwing_pos_control_main.c b/src/modules/fixedwing_pos_control/fixedwing_pos_control_main.c
deleted file mode 100644
index 888dd0942..000000000
--- a/src/modules/fixedwing_pos_control/fixedwing_pos_control_main.c
+++ /dev/null
@@ -1,479 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: 	@author Thomas Gubler <thomasgubler@student.ethz.ch>
- *   			@author Doug Weibel <douglas.weibel@colorado.edu>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-/**
- * @file fixedwing_pos_control.c
- * Implementation of a fixed wing attitude controller.
- */
-
-#include <nuttx/config.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <math.h>
-#include <poll.h>
-#include <time.h>
-#include <drivers/drv_hrt.h>
-#include <arch/board/board.h>
-#include <uORB/uORB.h>
-#include <uORB/topics/vehicle_global_position.h>
-#include <uORB/topics/vehicle_global_position_setpoint.h>
-#include <uORB/topics/vehicle_attitude_setpoint.h>
-#include <uORB/topics/manual_control_setpoint.h>
-#include <uORB/topics/actuator_controls.h>
-#include <uORB/topics/vehicle_rates_setpoint.h>
-#include <uORB/topics/vehicle_attitude.h>
-#include <uORB/topics/parameter_update.h>
-#include <systemlib/param/param.h>
-#include <systemlib/pid/pid.h>
-#include <systemlib/geo/geo.h>
-#include <systemlib/perf_counter.h>
-#include <systemlib/systemlib.h>
-
-/*
- * Controller parameters, accessible via MAVLink
- *
- */
-PARAM_DEFINE_FLOAT(FW_HEAD_P, 0.1f);
-PARAM_DEFINE_FLOAT(FW_HEADR_I, 0.1f);
-PARAM_DEFINE_FLOAT(FW_HEADR_LIM, 1.5f); //TODO: think about reasonable value
-PARAM_DEFINE_FLOAT(FW_XTRACK_P, 0.01745f);		// Radians per meter off track
-PARAM_DEFINE_FLOAT(FW_ALT_P, 0.1f);
-PARAM_DEFINE_FLOAT(FW_ROLL_LIM, 0.7f);	// Roll angle limit in radians
-PARAM_DEFINE_FLOAT(FW_HEADR_P, 0.1f);
-PARAM_DEFINE_FLOAT(FW_PITCH_LIM, 0.35f);	/**< Pitch angle limit in radians per second */
-
-struct fw_pos_control_params {
-	float heading_p;
-	float headingr_p;
-	float headingr_i;
-	float headingr_lim;
-	float xtrack_p;
-	float altitude_p;
-	float roll_lim;
-	float pitch_lim;
-};
-
-struct fw_pos_control_param_handles {
-	param_t heading_p;
-	param_t headingr_p;
-	param_t headingr_i;
-	param_t headingr_lim;
-	param_t xtrack_p;
-	param_t altitude_p;
-	param_t roll_lim;
-	param_t pitch_lim;
-};
-
-
-struct planned_path_segments_s {
-	bool segment_type;
-	double start_lat;			// Start of line or center of arc
-	double start_lon;
-	double end_lat;
-	double end_lon;
-	float radius;				// Radius of arc
-	float arc_start_bearing;		// Bearing from center to start of arc
-	float arc_sweep;				// Angle (radians) swept out by arc around center.
-	// Positive for clockwise, negative for counter-clockwise
-};
-
-
-/* Prototypes */
-/* Internal Prototypes */
-static int parameters_init(struct fw_pos_control_param_handles *h);
-static int parameters_update(const struct fw_pos_control_param_handles *h, struct fw_pos_control_params *p);
-
-/**
- * Deamon management function.
- */
-__EXPORT int fixedwing_pos_control_main(int argc, char *argv[]);
-
-/**
- * Mainloop of deamon.
- */
-int fixedwing_pos_control_thread_main(int argc, char *argv[]);
-
-/**
- * Print the correct usage.
- */
-static void usage(const char *reason);
-
-/* Variables */
-static bool thread_should_exit = false;		/**< Deamon exit flag */
-static bool thread_running = false;		/**< Deamon status flag */
-static int deamon_task;				/**< Handle of deamon task / thread */
-
-
-/**
- * Parameter management
- */
-static int parameters_init(struct fw_pos_control_param_handles *h)
-{
-	/* PID parameters */
-	h->heading_p 		=	param_find("FW_HEAD_P");
-	h->headingr_p 		=	param_find("FW_HEADR_P");
-	h->headingr_i 		=	param_find("FW_HEADR_I");
-	h->headingr_lim 	=	param_find("FW_HEADR_LIM");
-	h->xtrack_p 		=	param_find("FW_XTRACK_P");
-	h->altitude_p 		=	param_find("FW_ALT_P");
-	h->roll_lim 		=	param_find("FW_ROLL_LIM");
-	h->pitch_lim 		=	param_find("FW_PITCH_LIM");
-
-	return OK;
-}
-
-static int parameters_update(const struct fw_pos_control_param_handles *h, struct fw_pos_control_params *p)
-{
-	param_get(h->heading_p, &(p->heading_p));
-	param_get(h->headingr_p, &(p->headingr_p));
-	param_get(h->headingr_i, &(p->headingr_i));
-	param_get(h->headingr_lim, &(p->headingr_lim));
-	param_get(h->xtrack_p, &(p->xtrack_p));
-	param_get(h->altitude_p, &(p->altitude_p));
-	param_get(h->roll_lim, &(p->roll_lim));
-	param_get(h->pitch_lim, &(p->pitch_lim));
-
-	return OK;
-}
-
-
-/* Main Thread */
-int fixedwing_pos_control_thread_main(int argc, char *argv[])
-{
-	/* read arguments */
-	bool verbose = false;
-
-	for (int i = 1; i < argc; i++) {
-		if (strcmp(argv[i], "-v") == 0 || strcmp(argv[i], "--verbose") == 0) {
-			verbose = true;
-		}
-	}
-
-	/* welcome user */
-	printf("[fixedwing pos control] started\n");
-
-	/* declare and safely initialize all structs */
-	struct vehicle_global_position_s global_pos;
-	memset(&global_pos, 0, sizeof(global_pos));
-	struct vehicle_global_position_s start_pos;		// Temporary variable, replace with
-	memset(&start_pos, 0, sizeof(start_pos));		// previous waypoint when available
-	struct vehicle_global_position_setpoint_s global_setpoint;
-	memset(&global_setpoint, 0, sizeof(global_setpoint));
-	struct vehicle_attitude_s att;
-	memset(&att, 0, sizeof(att));
-	struct crosstrack_error_s xtrack_err;
-	memset(&xtrack_err, 0, sizeof(xtrack_err));
-	struct parameter_update_s param_update;
-	memset(&param_update, 0, sizeof(param_update));
-
-	/* output structs */
-	struct vehicle_attitude_setpoint_s attitude_setpoint;
-	memset(&attitude_setpoint, 0, sizeof(attitude_setpoint));
-
-	/* publish attitude setpoint */
-	attitude_setpoint.roll_body = 0.0f;
-	attitude_setpoint.pitch_body = 0.0f;
-	attitude_setpoint.yaw_body = 0.0f;
-	attitude_setpoint.thrust = 0.0f;
-	orb_advert_t attitude_setpoint_pub = orb_advertise(ORB_ID(vehicle_attitude_setpoint), &attitude_setpoint);
-
-	/* subscribe */
-	int global_pos_sub = orb_subscribe(ORB_ID(vehicle_global_position));
-	int global_setpoint_sub = orb_subscribe(ORB_ID(vehicle_global_position_setpoint));
-	int att_sub = orb_subscribe(ORB_ID(vehicle_attitude));
-	int param_sub = orb_subscribe(ORB_ID(parameter_update));
-
-	/* Setup of loop */
-	struct pollfd fds[2] = {
-		{ .fd = param_sub, .events = POLLIN },
-		{ .fd = att_sub, .events = POLLIN }
-	};
-	bool global_sp_updated_set_once = false;
-
-	float psi_track = 0.0f;
-
-	int counter = 0;
-
-	struct fw_pos_control_params p;
-	struct fw_pos_control_param_handles h;
-
-	PID_t heading_controller;
-	PID_t heading_rate_controller;
-	PID_t offtrack_controller;
-	PID_t altitude_controller;
-
-	parameters_init(&h);
-	parameters_update(&h, &p);
-	pid_init(&heading_controller, p.heading_p, 0.0f, 0.0f, 0.0f, 10000.0f, PID_MODE_DERIVATIV_NONE, 0.0f); //arbitrary high limit
-	pid_init(&heading_rate_controller, p.headingr_p, p.headingr_i, 0.0f, 0.0f, p.roll_lim, PID_MODE_DERIVATIV_NONE, 0.0f);
-	pid_init(&altitude_controller, p.altitude_p, 0.0f, 0.0f, 0.0f, p.pitch_lim, PID_MODE_DERIVATIV_NONE, 0.0f);
-	pid_init(&offtrack_controller, p.xtrack_p, 0.0f, 0.0f, 0.0f , 60.0f * M_DEG_TO_RAD, PID_MODE_DERIVATIV_NONE, 0.0f); //TODO: remove hardcoded value
-
-	/* error and performance monitoring */
-	perf_counter_t fw_interval_perf = perf_alloc(PC_INTERVAL, "fixedwing_pos_control_interval");
-	perf_counter_t fw_err_perf = perf_alloc(PC_COUNT, "fixedwing_pos_control_err");
-
-	while (!thread_should_exit) {
-		/* wait for a sensor update, check for exit condition every 500 ms */
-		int ret = poll(fds, 2, 500);
-
-		if (ret < 0) {
-			/* poll error, count it in perf */
-			perf_count(fw_err_perf);
-
-		} else if (ret == 0) {
-			/* no return value, ignore */
-		} else {
-
-			/* only update parameters if they changed */
-			if (fds[0].revents & POLLIN) {
-				/* read from param to clear updated flag */
-				struct parameter_update_s update;
-				orb_copy(ORB_ID(parameter_update), param_sub, &update);
-
-				/* update parameters from storage */
-				parameters_update(&h, &p);
-				pid_set_parameters(&heading_controller, p.heading_p, 0, 0, 0, 10000.0f); //arbitrary high limit
-				pid_set_parameters(&heading_rate_controller, p.headingr_p, p.headingr_i, 0, 0, p.roll_lim);
-				pid_set_parameters(&altitude_controller, p.altitude_p, 0, 0, 0, p.pitch_lim);
-				pid_set_parameters(&offtrack_controller, p.xtrack_p, 0, 0, 0, 60.0f * M_DEG_TO_RAD); //TODO: remove hardcoded value
-			}
-
-			/* only run controller if attitude changed */
-			if (fds[1].revents & POLLIN) {
-
-
-				static uint64_t last_run = 0;
-				const float deltaT = (hrt_absolute_time() - last_run) / 1000000.0f;
-				last_run = hrt_absolute_time();
-
-				/* check if there is a new position or setpoint */
-				bool pos_updated;
-				orb_check(global_pos_sub, &pos_updated);
-				bool global_sp_updated;
-				orb_check(global_setpoint_sub, &global_sp_updated);
-
-				/* load local copies */
-				orb_copy(ORB_ID(vehicle_attitude), att_sub, &att);
-
-				if (pos_updated) {
-					orb_copy(ORB_ID(vehicle_global_position), global_pos_sub, &global_pos);
-				}
-
-				if (global_sp_updated) {
-					orb_copy(ORB_ID(vehicle_global_position_setpoint), global_setpoint_sub, &global_setpoint);
-					start_pos = global_pos; //for now using the current position as the startpoint (= approx. last waypoint because the setpoint switch occurs at the waypoint)
-					global_sp_updated_set_once = true;
-					psi_track = get_bearing_to_next_waypoint(global_pos.lat, global_pos.lon,
-							(double)global_setpoint.lat / (double)1e7d, (double)global_setpoint.lon / (double)1e7d);
-
-					printf("next wp direction: %0.4f\n", (double)psi_track);
-				}
-
-				/* Simple Horizontal Control */
-				if (global_sp_updated_set_once) {
-					//				if (counter % 100 == 0)
-					//					printf("lat_sp %d, ln_sp %d, lat: %d, lon: %d\n", global_setpoint.lat, global_setpoint.lon, global_pos.lat, global_pos.lon);
-
-					/* calculate crosstrack error */
-					// Only the case of a straight line track following handled so far
-					int distance_res = get_distance_to_line(&xtrack_err, (double)global_pos.lat / (double)1e7d, (double)global_pos.lon / (double)1e7d,
-										(double)start_pos.lat / (double)1e7d, (double)start_pos.lon / (double)1e7d,
-										(double)global_setpoint.lat / (double)1e7d, (double)global_setpoint.lon / (double)1e7d);
-
-					// XXX what is xtrack_err.past_end?
-					if (distance_res == OK /*&& !xtrack_err.past_end*/) {
-
-						float delta_psi_c = pid_calculate(&offtrack_controller, 0, xtrack_err.distance, 0.0f, 0.0f); //p.xtrack_p * xtrack_err.distance
-
-						float psi_c = psi_track + delta_psi_c;
-						float psi_e = psi_c - att.yaw;
-
-						/* wrap difference back onto -pi..pi range */
-						psi_e = _wrap_pi(psi_e);
-
-						if (verbose) {
-							printf("xtrack_err.distance %.4f ", (double)xtrack_err.distance);
-							printf("delta_psi_c %.4f ", (double)delta_psi_c);
-							printf("psi_c %.4f ", (double)psi_c);
-							printf("att.yaw %.4f ", (double)att.yaw);
-							printf("psi_e %.4f ", (double)psi_e);
-						}
-
-						/* calculate roll setpoint, do this artificially around zero */
-						float delta_psi_rate_c = pid_calculate(&heading_controller, psi_e, 0.0f, 0.0f, 0.0f);
-						float psi_rate_track = 0; //=V_gr/r_track , this will be needed for implementation of arc following
-						float psi_rate_c = delta_psi_rate_c + psi_rate_track;
-
-						/* limit turn rate */
-						if (psi_rate_c > p.headingr_lim) {
-							psi_rate_c = p.headingr_lim;
-
-						} else if (psi_rate_c < -p.headingr_lim) {
-							psi_rate_c = -p.headingr_lim;
-						}
-
-						float psi_rate_e = psi_rate_c - att.yawspeed;
-
-						// XXX sanity check: Assume 10 m/s stall speed and no stall condition
-						float ground_speed = sqrtf(global_pos.vx * global_pos.vx + global_pos.vy * global_pos.vy);
-
-						if (ground_speed < 10.0f) {
-							ground_speed = 10.0f;
-						}
-
-						float psi_rate_e_scaled = psi_rate_e * ground_speed / 9.81f; //* V_gr / g
-
-						attitude_setpoint.roll_body = pid_calculate(&heading_rate_controller, psi_rate_e_scaled, 0.0f, 0.0f, deltaT);
-
-						if (verbose) {
-							printf("psi_rate_c %.4f ", (double)psi_rate_c);
-							printf("psi_rate_e_scaled %.4f ", (double)psi_rate_e_scaled);
-							printf("rollbody %.4f\n", (double)attitude_setpoint.roll_body);
-						}
-
-						if (verbose && counter % 100 == 0)
-							printf("xtrack_err.distance: %0.4f, delta_psi_c: %0.4f\n", xtrack_err.distance, delta_psi_c);
-
-					} else {
-						if (verbose && counter % 100 == 0)
-							printf("distance_res: %d, past_end %d\n", distance_res, xtrack_err.past_end);
-					}
-
-					/* Very simple Altitude Control */
-					if (pos_updated) {
-
-						//TODO: take care of relative vs. ab. altitude
-						attitude_setpoint.pitch_body = pid_calculate(&altitude_controller, global_setpoint.altitude, global_pos.alt, 0.0f, 0.0f);
-
-					}
-
-					// XXX need speed control
-					attitude_setpoint.thrust = 0.7f;
-
-					/* publish the attitude setpoint */
-					orb_publish(ORB_ID(vehicle_attitude_setpoint), attitude_setpoint_pub, &attitude_setpoint);
-
-					/* measure in what intervals the controller runs */
-					perf_count(fw_interval_perf);
-
-					counter++;
-
-				} else {
-					// XXX no setpoint, decent default needed (loiter?)
-				}
-			}
-		}
-	}
-
-	printf("[fixedwing_pos_control] exiting.\n");
-	thread_running = false;
-
-
-	close(attitude_setpoint_pub);
-
-	fflush(stdout);
-	exit(0);
-
-	return 0;
-
-}
-
-/* Startup Functions */
-
-static void
-usage(const char *reason)
-{
-	if (reason)
-		fprintf(stderr, "%s\n", reason);
-
-	fprintf(stderr, "usage: fixedwing_pos_control {start|stop|status}\n\n");
-	exit(1);
-}
-
-/**
- * The deamon app only briefly exists to start
- * the background job. The stack size assigned in the
- * Makefile does only apply to this management task.
- *
- * The actual stack size should be set in the call
- * to task_create().
- */
-int fixedwing_pos_control_main(int argc, char *argv[])
-{
-	if (argc < 1)
-		usage("missing command");
-
-	if (!strcmp(argv[1], "start")) {
-
-		if (thread_running) {
-			printf("fixedwing_pos_control already running\n");
-			/* this is not an error */
-			exit(0);
-		}
-
-		thread_should_exit = false;
-		deamon_task = task_spawn_cmd("fixedwing_pos_control",
-					 SCHED_DEFAULT,
-					 SCHED_PRIORITY_MAX - 20,
-					 2048,
-					 fixedwing_pos_control_thread_main,
-					 (argv) ? (const char **)&argv[2] : (const char **)NULL);
-		thread_running = true;
-		exit(0);
-	}
-
-	if (!strcmp(argv[1], "stop")) {
-		thread_should_exit = true;
-		exit(0);
-	}
-
-	if (!strcmp(argv[1], "status")) {
-		if (thread_running) {
-			printf("\tfixedwing_pos_control is running\n");
-
-		} else {
-			printf("\tfixedwing_pos_control not started\n");
-		}
-
-		exit(0);
-	}
-
-	usage("unrecognized command");
-	exit(1);
-}
diff --git a/src/modules/fixedwing_pos_control/module.mk b/src/modules/fixedwing_pos_control/module.mk
deleted file mode 100644
index b976377e9..000000000
--- a/src/modules/fixedwing_pos_control/module.mk
+++ /dev/null
@@ -1,40 +0,0 @@
-############################################################################
-#
-#   Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions
-# are met:
-#
-# 1. Redistributions of source code must retain the above copyright
-#    notice, this list of conditions and the following disclaimer.
-# 2. Redistributions in binary form must reproduce the above copyright
-#    notice, this list of conditions and the following disclaimer in
-#    the documentation and/or other materials provided with the
-#    distribution.
-# 3. Neither the name PX4 nor the names of its contributors may be
-#    used to endorse or promote products derived from this software
-#    without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
-# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
-# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-# POSSIBILITY OF SUCH DAMAGE.
-#
-############################################################################
-
-#
-# Fixedwing PositionControl application
-#
-
-MODULE_COMMAND	= fixedwing_pos_control
-
-SRCS		= fixedwing_pos_control_main.c
diff --git a/src/modules/fw_att_control/fw_att_control_main.cpp b/src/modules/fw_att_control/fw_att_control_main.cpp
index f139c25f4..3cd4ce928 100644
--- a/src/modules/fw_att_control/fw_att_control_main.cpp
+++ b/src/modules/fw_att_control/fw_att_control_main.cpp
@@ -134,6 +134,8 @@ private:
 	struct vehicle_global_position_s		_global_pos;		/**< global position */
 
 	perf_counter_t	_loop_perf;			/**< loop performance counter */
+	perf_counter_t	_nonfinite_input_perf;		/**< performance counter for non finite input */
+	perf_counter_t	_nonfinite_output_perf;		/**< performance counter for non finite output */
 
 	bool		_setpoint_valid;		/**< flag if the position control setpoint is valid */
 
@@ -173,6 +175,8 @@ private:
 		float pitchsp_offset_deg;			/**< Pitch Setpoint Offset in deg */
 		float rollsp_offset_rad;			/**< Roll Setpoint Offset in rad */
 		float pitchsp_offset_rad;			/**< Pitch Setpoint Offset in rad */
+		float man_roll_max;						/**< Max Roll in rad */
+		float man_pitch_max;					/**< Max Pitch in rad */
 
 	}		_parameters;			/**< local copies of interesting parameters */
 
@@ -211,6 +215,8 @@ private:
 		param_t trim_yaw;
 		param_t rollsp_offset_deg;
 		param_t pitchsp_offset_deg;
+		param_t man_roll_max;
+		param_t man_pitch_max;
 	}		_parameter_handles;		/**< handles for interesting parameters */
 
 
@@ -269,7 +275,7 @@ private:
 	/**
 	 * Main sensor collection task.
 	 */
-	void		task_main() __attribute__((noreturn));
+	void		task_main();
 };
 
 namespace att_control
@@ -300,12 +306,14 @@ FixedwingAttitudeControl::FixedwingAttitudeControl() :
 
 /* publications */
 	_rate_sp_pub(-1),
-	_actuators_0_pub(-1),
 	_attitude_sp_pub(-1),
+	_actuators_0_pub(-1),
 	_actuators_1_pub(-1),
 
 /* performance counters */
 	_loop_perf(perf_alloc(PC_ELAPSED, "fw att control")),
+	_nonfinite_input_perf(perf_alloc(PC_COUNT, "fw att control nonfinite input")),
+	_nonfinite_output_perf(perf_alloc(PC_COUNT, "fw att control nonfinite output")),
 /* states */
 	_setpoint_valid(false)
 {
@@ -354,6 +362,9 @@ FixedwingAttitudeControl::FixedwingAttitudeControl() :
 	_parameter_handles.rollsp_offset_deg = param_find("FW_RSP_OFF");
 	_parameter_handles.pitchsp_offset_deg = param_find("FW_PSP_OFF");
 
+	_parameter_handles.man_roll_max = param_find("FW_MAN_R_MAX");
+	_parameter_handles.man_pitch_max = param_find("FW_MAN_P_MAX");
+
 	/* fetch initial parameter values */
 	parameters_update();
 }
@@ -380,6 +391,10 @@ FixedwingAttitudeControl::~FixedwingAttitudeControl()
 		} while (_control_task != -1);
 	}
 
+	perf_free(_loop_perf);
+	perf_free(_nonfinite_input_perf);
+	perf_free(_nonfinite_output_perf);
+
 	att_control::g_control = nullptr;
 }
 
@@ -421,6 +436,10 @@ FixedwingAttitudeControl::parameters_update()
 	param_get(_parameter_handles.pitchsp_offset_deg, &(_parameters.pitchsp_offset_deg));
 	_parameters.rollsp_offset_rad = math::radians(_parameters.rollsp_offset_deg);
 	_parameters.pitchsp_offset_rad = math::radians(_parameters.pitchsp_offset_deg);
+	param_get(_parameter_handles.man_roll_max, &(_parameters.man_roll_max));
+	param_get(_parameter_handles.man_pitch_max, &(_parameters.man_pitch_max));
+	_parameters.man_roll_max = math::radians(_parameters.man_roll_max);
+	_parameters.man_pitch_max = math::radians(_parameters.man_pitch_max);
 
 
 	/* pitch control parameters */
@@ -581,6 +600,8 @@ FixedwingAttitudeControl::task_main()
 
 	while (!_task_should_exit) {
 
+		static int loop_counter = 0;
+
 		/* wait for up to 500ms for data */
 		int pret = poll(&fds[0], (sizeof(fds) / sizeof(fds[0])), 100);
 
@@ -660,49 +681,65 @@ FixedwingAttitudeControl::task_main()
 
 				float airspeed;
 
-				/* if airspeed is smaller than min, the sensor is not giving good readings */
-				if ((_airspeed.indicated_airspeed_m_s < 0.5f * _parameters.airspeed_min) ||
-				    !isfinite(_airspeed.indicated_airspeed_m_s) ||
+				/* if airspeed is not updating, we assume the normal average speed */
+				if (bool nonfinite = !isfinite(_airspeed.true_airspeed_m_s) ||
 				    hrt_elapsed_time(&_airspeed.timestamp) > 1e6) {
 					airspeed = _parameters.airspeed_trim;
-
+					if (nonfinite) {
+						perf_count(_nonfinite_input_perf);
+					}
 				} else {
-					airspeed = _airspeed.indicated_airspeed_m_s;
+					airspeed = _airspeed.true_airspeed_m_s;
 				}
 
-				float airspeed_scaling = _parameters.airspeed_trim / airspeed;
-				//warnx("aspd scale: %6.2f act scale: %6.2f", airspeed_scaling, actuator_scaling);
+				/*
+				 * For scaling our actuators using anything less than the min (close to stall)
+				 * speed doesn't make any sense - its the strongest reasonable deflection we
+				 * want to do in flight and its the baseline a human pilot would choose.
+				 *
+				 * Forcing the scaling to this value allows reasonable handheld tests.
+				 */
+
+				float airspeed_scaling = _parameters.airspeed_trim / ((airspeed < _parameters.airspeed_min) ? _parameters.airspeed_min : airspeed);
 
 				float roll_sp = _parameters.rollsp_offset_rad;
 				float pitch_sp = _parameters.pitchsp_offset_rad;
 				float throttle_sp = 0.0f;
 
 				if (_vcontrol_mode.flag_control_velocity_enabled || _vcontrol_mode.flag_control_position_enabled) {
+					/* read in attitude setpoint from attitude setpoint uorb topic */
 					roll_sp = _att_sp.roll_body + _parameters.rollsp_offset_rad;
 					pitch_sp = _att_sp.pitch_body + _parameters.pitchsp_offset_rad;
 					throttle_sp = _att_sp.thrust;
 
 					/* reset integrals where needed */
-					if (_att_sp.roll_reset_integral)
+					if (_att_sp.roll_reset_integral) {
 						_roll_ctrl.reset_integrator();
-
+					}
+					if (_att_sp.pitch_reset_integral) {
+						_pitch_ctrl.reset_integrator();
+					}
+					if (_att_sp.yaw_reset_integral) {
+						_yaw_ctrl.reset_integrator();
+					}
 				} else {
 					/*
 					 * Scale down roll and pitch as the setpoints are radians
-					 * and a typical remote can only do 45 degrees, the mapping is
-					 * -1..+1 to -45..+45 degrees or -0.75..+0.75 radians.
+					 * and a typical remote can only do around 45 degrees, the mapping is
+					 * -1..+1 to -man_roll_max rad..+man_roll_max rad (equivalent for pitch)
 					 *
 					 * With this mapping the stick angle is a 1:1 representation of
-					 * the commanded attitude. If more than 45 degrees are desired,
-					 * a scaling parameter can be applied to the remote.
+					 * the commanded attitude.
 					 *
 					 * The trim gets subtracted here from the manual setpoint to get
 					 * the intended attitude setpoint. Later, after the rate control step the
 					 * trim is added again to the control signal.
 					 */
-					roll_sp = (_manual.roll - _parameters.trim_roll) * 0.75f + _parameters.rollsp_offset_rad;
-					pitch_sp = (_manual.pitch - _parameters.trim_pitch) * 0.75f + _parameters.pitchsp_offset_rad;
-					throttle_sp = _manual.throttle;
+					roll_sp = (_manual.y * _parameters.man_roll_max - _parameters.trim_roll)
+						+ _parameters.rollsp_offset_rad;
+					pitch_sp = -(_manual.x * _parameters.man_pitch_max - _parameters.trim_pitch)
+						+ _parameters.pitchsp_offset_rad;
+					throttle_sp = _manual.z;
 					_actuators.control[4] = _manual.flaps;
 
 					/*
@@ -737,7 +774,9 @@ FixedwingAttitudeControl::task_main()
 					speed_body_v = _att.R[0][1] * _global_pos.vel_n + _att.R[1][1] * _global_pos.vel_e + _att.R[2][1] * _global_pos.vel_d;
 					speed_body_w = _att.R[0][2] * _global_pos.vel_n + _att.R[1][2] * _global_pos.vel_e + _att.R[2][2] * _global_pos.vel_d;
 				} else	{
-					warnx("Did not get a valid R\n");
+					if (loop_counter % 10 == 0) {
+						warnx("Did not get a valid R\n");
+					}
 				}
 
 				/* Run attitude controllers */
@@ -755,7 +794,12 @@ FixedwingAttitudeControl::task_main()
 							_parameters.airspeed_min, _parameters.airspeed_max, airspeed, airspeed_scaling, lock_integrator);
 					_actuators.control[0] = (isfinite(roll_u)) ? roll_u + _parameters.trim_roll : _parameters.trim_roll;
 					if (!isfinite(roll_u)) {
-						warnx("roll_u %.4f", roll_u);
+						_roll_ctrl.reset_integrator();
+						perf_count(_nonfinite_output_perf);
+
+						if (loop_counter % 10 == 0) {
+							warnx("roll_u %.4f", (double)roll_u);
+						}
 					}
 
 					float pitch_u = _pitch_ctrl.control_bodyrate(_att.roll, _att.pitch,
@@ -764,8 +808,22 @@ FixedwingAttitudeControl::task_main()
 							_parameters.airspeed_min, _parameters.airspeed_max, airspeed, airspeed_scaling, lock_integrator);
 					_actuators.control[1] = (isfinite(pitch_u)) ? pitch_u + _parameters.trim_pitch : _parameters.trim_pitch;
 					if (!isfinite(pitch_u)) {
-						warnx("pitch_u %.4f, _yaw_ctrl.get_desired_rate() %.4f, airspeed %.4f, airspeed_scaling %.4f, roll_sp %.4f, pitch_sp %.4f, _roll_ctrl.get_desired_rate() %.4f, _pitch_ctrl.get_desired_rate() %.4f att_sp.roll_body %.4f",
-								pitch_u, _yaw_ctrl.get_desired_rate(), airspeed, airspeed_scaling, roll_sp, pitch_sp, _roll_ctrl.get_desired_rate(), _pitch_ctrl.get_desired_rate(), _att_sp.roll_body);
+						_pitch_ctrl.reset_integrator();
+						perf_count(_nonfinite_output_perf);
+						if (loop_counter % 10 == 0) {
+							warnx("pitch_u %.4f, _yaw_ctrl.get_desired_rate() %.4f,"
+								" airspeed %.4f, airspeed_scaling %.4f,"
+								" roll_sp %.4f, pitch_sp %.4f,"
+								" _roll_ctrl.get_desired_rate() %.4f,"
+								" _pitch_ctrl.get_desired_rate() %.4f"
+								" att_sp.roll_body %.4f",
+								(double)pitch_u, (double)_yaw_ctrl.get_desired_rate(),
+								(double)airspeed, (double)airspeed_scaling,
+								(double)roll_sp, (double)pitch_sp,
+								(double)_roll_ctrl.get_desired_rate(),
+								(double)_pitch_ctrl.get_desired_rate(),
+								(double)_att_sp.roll_body);
+						}
 					}
 
 					float yaw_u = _yaw_ctrl.control_bodyrate(_att.roll, _att.pitch,
@@ -774,16 +832,25 @@ FixedwingAttitudeControl::task_main()
 							_parameters.airspeed_min, _parameters.airspeed_max, airspeed, airspeed_scaling, lock_integrator);
 					_actuators.control[2] = (isfinite(yaw_u)) ? yaw_u + _parameters.trim_yaw : _parameters.trim_yaw;
 					if (!isfinite(yaw_u)) {
-						warnx("yaw_u %.4f", yaw_u);
+						_yaw_ctrl.reset_integrator();
+						perf_count(_nonfinite_output_perf);
+						if (loop_counter % 10 == 0) {
+							warnx("yaw_u %.4f", (double)yaw_u);
+						}
 					}
 
 					/* throttle passed through */
 					_actuators.control[3] = (isfinite(throttle_sp)) ? throttle_sp : 0.0f;
 					if (!isfinite(throttle_sp)) {
-						warnx("throttle_sp %.4f", throttle_sp);
+						if (loop_counter % 10 == 0) {
+							warnx("throttle_sp %.4f", (double)throttle_sp);
+						}
 					}
 				} else {
-					warnx("Non-finite setpoint roll_sp: %.4f, pitch_sp %.4f", roll_sp, pitch_sp);
+					perf_count(_nonfinite_input_perf);
+					if (loop_counter % 10 == 0) {
+						warnx("Non-finite setpoint roll_sp: %.4f, pitch_sp %.4f", (double)roll_sp, (double)pitch_sp);
+					}
 				}
 
 				/*
@@ -808,10 +875,10 @@ FixedwingAttitudeControl::task_main()
 
 			} else {
 				/* manual/direct control */
-				_actuators.control[0] = _manual.roll;
-				_actuators.control[1] = _manual.pitch;
-				_actuators.control[2] = _manual.yaw;
-				_actuators.control[3] = _manual.throttle;
+				_actuators.control[0] = _manual.y;
+				_actuators.control[1] = -_manual.x;
+				_actuators.control[2] = _manual.r;
+				_actuators.control[3] = _manual.z;
 				_actuators.control[4] = _manual.flaps;
 			}
 
@@ -847,6 +914,7 @@ FixedwingAttitudeControl::task_main()
 
 		}
 
+		loop_counter++;
 		perf_end(_loop_perf);
 	}
 
diff --git a/src/modules/fw_att_control/fw_att_control_params.c b/src/modules/fw_att_control/fw_att_control_params.c
index c80a44f2a..7cae84678 100644
--- a/src/modules/fw_att_control/fw_att_control_params.c
+++ b/src/modules/fw_att_control/fw_att_control_params.c
@@ -50,139 +50,322 @@ f *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
  * Controller parameters, accessible via MAVLink
  *
  */
-// @DisplayName		Attitude Time Constant
-// @Description		This defines the latency between a step input and the achieved setpoint (inverse to a P gain). Half a second is a good start value and fits for most average systems. Smaller systems may require smaller values, but as this will wear out servos faster, the value should only be decreased as needed.
-// @Range		0.4 to 1.0 seconds, in tens of seconds
+
+/**
+ * Attitude Time Constant
+ *
+ * This defines the latency between a step input and the achieved setpoint
+ * (inverse to a P gain). Half a second is a good start value and fits for
+ * most average systems. Smaller systems may require smaller values, but as
+ * this will wear out servos faster, the value should only be decreased as
+ * needed.
+ *
+ * @unit seconds
+ * @min 0.4
+ * @max 1.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_ATT_TC, 0.5f);
 
-// @DisplayName		Pitch rate proportional gain.
-// @Description		This defines how much the elevator input will be commanded depending on the current body angular rate error.
-// @Range		10 to 200, 1 increments
+/**
+ * Pitch rate proportional gain.
+ *
+ * This defines how much the elevator input will be commanded depending on the
+ * current body angular rate error.
+ *
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_PR_P, 0.05f);
 
-// @DisplayName		Pitch rate integrator gain.
-// @Description		This gain defines how much control response will result out of a steady state error. It trims any constant error.
-// @Range		0 to 50.0
+/**
+ * Pitch rate integrator gain.
+ *
+ * This gain defines how much control response will result out of a steady
+ * state error. It trims any constant error.
+ *
+ * @min 0.0
+ * @max 50.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_PR_I, 0.0f);
 
-// @DisplayName		Maximum positive / up pitch rate.
-// @Description		This limits the maximum pitch up angular rate the controller will output (in degrees per second). Setting a value of zero disables the limit.
-// @Range		0 to 90.0 degrees per seconds, in 1 increments
+/**
+ * Maximum positive / up pitch rate.
+ *
+ * This limits the maximum pitch up angular rate the controller will output (in
+ * degrees per second). Setting a value of zero disables the limit.
+ *
+ * @unit deg/s
+ * @min 0.0
+ * @max 90.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_P_RMAX_POS, 0.0f);
 
-// @DisplayName		Maximum negative / down pitch rate.
-// @Description		This limits the maximum pitch down up angular rate the controller will output (in degrees per second). Setting a value of zero disables the limit.
-// @Range		0 to 90.0 degrees per seconds, in 1 increments
+/**
+ * Maximum negative / down pitch rate.
+ *
+ * This limits the maximum pitch down up angular rate the controller will
+ * output (in degrees per second). Setting a value of zero disables the limit.
+ *
+ * @unit deg/s
+ * @min 0.0
+ * @max 90.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_P_RMAX_NEG, 0.0f);
 
-// @DisplayName		Pitch rate integrator limit
-// @Description		The portion of the integrator part in the control surface deflection is limited to this value
-// @Range		0.0 to 1
-// @Increment		0.1
+/**
+ * Pitch rate integrator limit
+ *
+ * The portion of the integrator part in the control surface deflection is
+ * limited to this value
+ *
+ * @min 0.0
+ * @max 1.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_PR_IMAX, 0.2f);
 
-// @DisplayName		Roll to Pitch feedforward gain.
-// @Description		This compensates during turns and ensures the nose stays level.
-// @Range		0.5 2.0
-// @Increment		0.05
-// @User		User
+/**
+ * Roll to Pitch feedforward gain.
+ *
+ * This compensates during turns and ensures the nose stays level.
+ *
+ * @min 0.0
+ * @max 2.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_P_ROLLFF, 0.0f); //xxx: set to 0 as default, see comment in ECL_PitchController::control_attitude (float turn_offset = ...)
 
-// @DisplayName		Roll rate proportional Gain.
-// @Description		This defines how much the aileron input will be commanded depending on the current body angular rate error.
-// @Range		10.0 200.0
-// @Increment		10.0
-// @User		User
+/**
+ * Roll rate proportional Gain
+ *
+ * This defines how much the aileron input will be commanded depending on the
+ * current body angular rate error.
+ *
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_RR_P, 0.05f);
 
-// @DisplayName		Roll rate integrator Gain
-// @Description		This gain defines how much control response will result out of a steady state error. It trims any constant error.
-// @Range		0.0 100.0
-// @Increment		5.0
-// @User		User
+/**
+ * Roll rate integrator Gain
+ *
+ * This gain defines how much control response will result out of a steady
+ * state error. It trims any constant error.
+ *
+ * @min 0.0
+ * @max 100.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_RR_I, 0.0f);
 
-// @DisplayName		Roll Integrator Anti-Windup
-// @Description		The portion of the integrator part in the control surface deflection is limited to this value.
-// @Range		0.0 to 1.0
-// @Increment		0.1
+/**
+ * Roll Integrator Anti-Windup
+ *
+ * The portion of the integrator part in the control surface deflection is limited to this value.
+ *
+ * @min 0.0
+ * @max 1.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_RR_IMAX, 0.2f);
 
-// @DisplayName		Maximum Roll Rate
-// @Description		This limits the maximum roll rate the controller will output (in degrees per second). Setting a value of zero disables the limit.
-// @Range		0 to 90.0 degrees per seconds
-// @Increment		1.0
-PARAM_DEFINE_FLOAT(FW_R_RMAX, 0);
+/**
+ * Maximum Roll Rate
+ *
+ * This limits the maximum roll rate the controller will output (in degrees per
+ * second). Setting a value of zero disables the limit.
+ *
+ * @unit deg/s
+ * @min 0.0
+ * @max 90.0
+ * @group FW Attitude Control
+ */
+PARAM_DEFINE_FLOAT(FW_R_RMAX, 0.0f);
 
-// @DisplayName		Yaw rate proportional gain.
-// @Description		This defines how much the rudder input will be commanded depending on the current body angular rate error.
-// @Range		10 to 200, 1 increments
-PARAM_DEFINE_FLOAT(FW_YR_P, 0.05);
+/**
+ * Yaw rate proportional gain
+ *
+ * This defines how much the rudder input will be commanded depending on the
+ * current body angular rate error.
+ *
+ * @group FW Attitude Control
+ */
+PARAM_DEFINE_FLOAT(FW_YR_P, 0.05f);
 
-// @DisplayName		Yaw rate integrator gain.
-// @Description		This gain defines how much control response will result out of a steady state error. It trims any constant error.
-// @Range		0 to 50.0
+/**
+ * Yaw rate integrator gain
+ *
+ * This gain defines how much control response will result out of a steady
+ * state error. It trims any constant error.
+ *
+ * @min 0.0
+ * @max 50.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_YR_I, 0.0f);
 
-// @DisplayName		Yaw rate integrator limit
-// @Description		The portion of the integrator part in the control surface deflection is limited to this value
-// @Range		0.0 to 1
-// @Increment		0.1
+/**
+ * Yaw rate integrator limit
+ *
+ * The portion of the integrator part in the control surface deflection is
+ * limited to this value
+ *
+ * @min 0.0
+ * @max 1.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_YR_IMAX, 0.2f);
 
-// @DisplayName		Maximum Yaw Rate
-// @Description		This limits the maximum yaw rate the controller will output (in degrees per second). Setting a value of zero disables the limit.
-// @Range		0 to 90.0 degrees per seconds
-// @Increment		1.0
-PARAM_DEFINE_FLOAT(FW_Y_RMAX, 0);
+/**
+ * Maximum Yaw Rate
+ *
+ * This limits the maximum yaw rate the controller will output (in degrees per
+ * second). Setting a value of zero disables the limit.
+ *
+ * @unit deg/s
+ * @min 0.0
+ * @max 90.0
+ * @group FW Attitude Control
+ */
+PARAM_DEFINE_FLOAT(FW_Y_RMAX, 0.0f);
 
-// @DisplayName		Roll rate feed forward
-// @Description		Direct feed forward from rate setpoint to control surface output
-// @Range		0 to 10
-// @Increment		0.1
+/**
+ * Roll rate feed forward
+ *
+ * Direct feed forward from rate setpoint to control surface output
+ *
+ * @min 0.0
+ * @max 10.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_RR_FF, 0.3f);
 
-// @DisplayName		Pitch rate feed forward
-// @Description		Direct feed forward from rate setpoint to control surface output
-// @Range		0 to 10
-// @Increment		0.1
+/**
+ * Pitch rate feed forward
+ *
+ * Direct feed forward from rate setpoint to control surface output
+ *
+ * @min 0.0
+ * @max 10.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_PR_FF, 0.4f);
 
-// @DisplayName		Yaw rate feed forward
-// @Description		Direct feed forward from rate setpoint to control surface output
-// @Range		0 to 10
-// @Increment		0.1
+/**
+ * Yaw rate feed forward
+ *
+ * Direct feed forward from rate setpoint to control surface output
+ *
+ * @min 0.0
+ * @max 10.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_YR_FF, 0.3f);
 
-// @DisplayName		Minimal speed for yaw coordination
-// @Description		For airspeeds above this value the yaw rate is calculated for a coordinated turn. Set to a very high value to disable.
-// @Range		0 to 90.0 degrees per seconds
-// @Increment		1.0
+/**
+ * Minimal speed for yaw coordination
+ *
+ * For airspeeds above this value, the yaw rate is calculated for a coordinated
+ * turn. Set to a very high value to disable.
+ *
+ * @unit m/s
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_YCO_VMIN, 1000.0f);
 
-/* Airspeed parameters: the following parameters about airspeed are used by the attitude and the positon controller */
+/* Airspeed parameters:
+ * The following parameters about airspeed are used by the attitude and the
+ * position controller.
+ * */
 
-// @DisplayName		Minimum Airspeed
-// @Description		If the airspeed falls below this value the TECS controller will try to increase airspeed more aggressively
-// @Range		0.0 to 30
+/**
+ * Minimum Airspeed
+ *
+ * If the airspeed falls below this value, the TECS controller will try to
+ * increase airspeed more aggressively.
+ *
+ * @unit m/s
+ * @min 0.0
+ * @max 30.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_AIRSPD_MIN, 13.0f);
 
-// @DisplayName		Trim Airspeed
-// @Description		The TECS controller tries to fly at this airspeed
-// @Range		0.0 to 30
+/**
+ * Trim Airspeed
+ *
+ * The TECS controller tries to fly at this airspeed.
+ *
+ * @unit m/s
+ * @min 0.0
+ * @max 30.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_AIRSPD_TRIM, 20.0f);
 
-// @DisplayName		Maximum Airspeed
-// @Description		If the airspeed is above this value the TECS controller will try to decrease airspeed more aggressively
-// @Range		0.0 to 30
+/**
+ * Maximum Airspeed
+ *
+ * If the airspeed is above this value, the TECS controller will try to decrease
+ * airspeed more aggressively.
+ *
+ * @unit m/s
+ * @min 0.0
+ * @max 30.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_AIRSPD_MAX, 50.0f);
 
-// @DisplayName		Roll Setpoint Offset
-// @Description		An airframe specific offset of the roll setpoint in degrees, the value is added to the roll setpoint and should correspond to the typical cruise speed of the airframe
-// @Range		-90.0 to 90.0
+/**
+ * Roll Setpoint Offset
+ *
+ * An airframe specific offset of the roll setpoint in degrees, the value is
+ * added to the roll setpoint and should correspond to the typical cruise speed
+ * of the airframe.
+ *
+ * @unit deg
+ * @min -90.0
+ * @max 90.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_RSP_OFF, 0.0f);
 
-// @DisplayName		Pitch Setpoint Offset
-// @Description		An airframe specific offset of the pitch setpoint in degrees, the value is added to the pitch setpoint and should correspond to the typical cruise speed of the airframe
-// @Range		-90.0 to 90.0
+/**
+ * Pitch Setpoint Offset
+ *
+ * An airframe specific offset of the pitch setpoint in degrees, the value is
+ * added to the pitch setpoint and should correspond to the typical cruise
+ * speed of the airframe.
+ *
+ * @unit deg
+ * @min -90.0
+ * @max 90.0
+ * @group FW Attitude Control
+ */
 PARAM_DEFINE_FLOAT(FW_PSP_OFF, 0.0f);
+
+/**
+ * Max Manual Roll
+ *
+ * Max roll for manual control in attitude stabilized mode
+ *
+ * @unit deg
+ * @min 0.0
+ * @max 90.0
+ * @group FW Attitude Control
+ */
+PARAM_DEFINE_FLOAT(FW_MAN_R_MAX, 45.0f);
+
+/**
+ * Max Manual Pitch
+ *
+ * Max pitch for manual control in attitude stabilized mode
+ *
+ * @unit deg
+ * @min 0.0
+ * @max 90.0
+ * @group FW Attitude Control
+ */
+PARAM_DEFINE_FLOAT(FW_MAN_P_MAX, 45.0f);
diff --git a/src/modules/fw_att_pos_estimator/estimator.h b/src/modules/fw_att_pos_estimator/estimator.h
deleted file mode 100644
index c5a5e9d8d..000000000
--- a/src/modules/fw_att_pos_estimator/estimator.h
+++ /dev/null
@@ -1,235 +0,0 @@
-#include <math.h>
-#include <stdint.h>
-
-#pragma once
-
-#define GRAVITY_MSS 9.80665f
-#define deg2rad 0.017453292f
-#define rad2deg 57.295780f
-#define pi 3.141592657f
-#define earthRate 0.000072921f
-#define earthRadius 6378145.0f
-#define earthRadiusInv  1.5678540e-7f
-
-class Vector3f
-{
-private:
-public:
-    float x;
-    float y;
-    float z;
-
-    float length(void) const;
-    Vector3f zero(void) const;
-};
-
-class Mat3f
-{
-private:
-public:
-    Vector3f x;
-    Vector3f y;
-    Vector3f z;
-
-    Mat3f();
-
-    Mat3f transpose(void) const;
-};
-
-Vector3f operator*(float sclIn1, Vector3f vecIn1);
-Vector3f operator+( Vector3f vecIn1, Vector3f vecIn2);
-Vector3f operator-( Vector3f vecIn1, Vector3f vecIn2);
-Vector3f operator*( Mat3f matIn, Vector3f vecIn);
-Vector3f operator%( Vector3f vecIn1, Vector3f vecIn2);
-Vector3f operator*(Vector3f vecIn1, float sclIn1);
-
-void swap_var(float &d1, float &d2);
-
-const unsigned int n_states = 21;
-const unsigned int data_buffer_size = 50;
-
-extern uint32_t statetimeStamp[data_buffer_size]; // time stamp for each state vector stored
-extern Vector3f correctedDelAng; // delta angles about the xyz body axes corrected for errors (rad)
-extern Vector3f correctedDelVel; // delta velocities along the XYZ body axes corrected for errors (m/s)
-extern Vector3f summedDelAng; // summed delta angles about the xyz body axes corrected for errors (rad)
-extern Vector3f summedDelVel; // summed delta velocities along the XYZ body axes corrected for errors (m/s)
-extern float accNavMag; // magnitude of navigation accel (- used to adjust GPS obs variance (m/s^2)
-extern Vector3f earthRateNED; // earths angular rate vector in NED (rad/s)
-extern Vector3f angRate; // angular rate vector in XYZ body axes measured by the IMU (rad/s)
-extern Vector3f accel; // acceleration vector in XYZ body axes measured by the IMU (m/s^2)
-extern Vector3f dVelIMU;
-extern Vector3f dAngIMU;
-
-extern float P[n_states][n_states]; // covariance matrix
-extern float Kfusion[n_states]; // Kalman gains
-extern float states[n_states]; // state matrix
-extern float storedStates[n_states][data_buffer_size]; // state vectors stored for the last 50 time steps
-
-extern Vector3f correctedDelAng; // delta angles about the xyz body axes corrected for errors (rad)
-extern Vector3f correctedDelVel; // delta velocities along the XYZ body axes corrected for errors (m/s)
-extern Vector3f summedDelAng; // summed delta angles about the xyz body axes corrected for errors (rad)
-extern Vector3f summedDelVel; // summed delta velocities along the XYZ body axes corrected for errors (m/s)
-
-extern float dtIMU; // time lapsed since the last IMU measurement or covariance update (sec)
-
-extern bool onGround; // boolean true when the flight vehicle is on the ground (not flying)
-extern bool useAirspeed; // boolean true if airspeed data is being used
-extern bool useCompass; // boolean true if magnetometer data is being used
-extern uint8_t fusionModeGPS ; // 0 = GPS outputs 3D velocity, 1 = GPS outputs 2D velocity, 2 = GPS outputs no velocity
-extern float innovVelPos[6]; // innovation output
-extern float varInnovVelPos[6]; // innovation variance output
-
-extern bool fuseVelData; // this boolean causes the posNE and velNED obs to be fused
-extern bool fusePosData; // this boolean causes the posNE and velNED obs to be fused
-extern bool fuseHgtData; // this boolean causes the hgtMea obs to be fused
-extern bool fuseMagData; // boolean true when magnetometer data is to be fused
-
-extern float velNED[3]; // North, East, Down velocity obs (m/s)
-extern float posNE[2]; // North, East position obs (m)
-extern float hgtMea; //  measured height (m)
-extern float posNED[3]; // North, East Down position (m)
-
-extern float statesAtVelTime[n_states]; // States at the effective measurement time for posNE and velNED measurements
-extern float statesAtPosTime[n_states]; // States at the effective measurement time for posNE and velNED measurements
-extern float statesAtHgtTime[n_states]; // States at the effective measurement time for the hgtMea measurement
-
-extern float innovMag[3]; // innovation output
-extern float varInnovMag[3]; // innovation variance output
-extern Vector3f magData; // magnetometer flux radings in X,Y,Z body axes
-extern float statesAtMagMeasTime[n_states]; // filter satates at the effective measurement time
-extern float innovVtas; // innovation output
-extern float varInnovVtas; // innovation variance output
-extern bool fuseVtasData; // boolean true when airspeed data is to be fused
-extern float VtasMeas; // true airspeed measurement (m/s)
-extern float statesAtVtasMeasTime[n_states]; // filter states at the effective measurement time
-extern float latRef; // WGS-84 latitude of reference point (rad)
-extern float lonRef; // WGS-84 longitude of reference point (rad)
-extern float hgtRef; // WGS-84 height of reference point (m)
-extern Vector3f magBias; // states representing magnetometer bias vector in XYZ body axes
-extern uint8_t covSkipCount; // Number of state prediction frames (IMU daya updates to skip before doing the covariance prediction
-extern float EAS2TAS; // ratio f true to equivalent airspeed
-
-// GPS input data variables
-extern float gpsCourse;
-extern float gpsVelD;
-extern float gpsLat;
-extern float gpsLon;
-extern float gpsHgt;
-extern uint8_t GPSstatus;
-
-// Baro input
-extern float baroHgt;
-
-extern bool statesInitialised;
-extern bool numericalProtection;
-
-const float covTimeStepMax = 0.07f; // maximum time allowed between covariance predictions
-const float covDelAngMax = 0.02f; // maximum delta angle between covariance predictions
-
-extern bool staticMode;
-
-enum GPS_FIX {
-    GPS_FIX_NOFIX = 0,
-    GPS_FIX_2D = 2,
-    GPS_FIX_3D = 3
-};
-
-struct ekf_status_report {
-    bool velHealth;
-    bool posHealth;
-    bool hgtHealth;
-    bool velTimeout;
-    bool posTimeout;
-    bool hgtTimeout;
-    uint32_t velFailTime;
-    uint32_t posFailTime;
-    uint32_t hgtFailTime;
-    float states[n_states];
-    bool statesNaN;
-    bool covarianceNaN;
-    bool kalmanGainsNaN;
-};
-
-void  UpdateStrapdownEquationsNED();
-
-void CovariancePrediction(float dt);
-
-void FuseVelposNED();
-
-void FuseMagnetometer();
-
-void FuseAirspeed();
-
-void zeroRows(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last);
-
-void zeroCols(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last);
-
-float sq(float valIn);
-
-void quatNorm(float (&quatOut)[4], const float quatIn[4]);
-
-// store staes along with system time stamp in msces
-void StoreStates(uint64_t timestamp_ms);
-
-/**
- * Recall the state vector.
- *
- * Recalls the vector stored at closest time to the one specified by msec
- *
- * @return zero on success, integer indicating the number of invalid states on failure.
- *         Does only copy valid states, if the statesForFusion vector was initialized
- *         correctly by the caller, the result can be safely used, but is a mixture
- *         time-wise where valid states were updated and invalid remained at the old
- *         value.
- */
-int RecallStates(float statesForFusion[n_states], uint64_t msec);
-
-void ResetStoredStates();
-
-void quat2Tbn(Mat3f &Tbn, const float (&quat)[4]);
-
-void calcEarthRateNED(Vector3f &omega, float latitude);
-
-void eul2quat(float (&quat)[4], const float (&eul)[3]);
-
-void quat2eul(float (&eul)[3], const float (&quat)[4]);
-
-void calcvelNED(float (&velNED)[3], float gpsCourse, float gpsGndSpd, float gpsVelD);
-
-void calcposNED(float (&posNED)[3], float lat, float lon, float hgt, float latRef, float lonRef, float hgtRef);
-
-void calcLLH(float (&posNED)[3], float lat, float lon, float hgt, float latRef, float lonRef, float hgtRef);
-
-void OnGroundCheck();
-
-void CovarianceInit();
-
-void InitialiseFilter(float (&initvelNED)[3]);
-
-float ConstrainFloat(float val, float min, float max);
-
-void ConstrainVariances();
-
-void ConstrainStates();
-
-void ForceSymmetry();
-
-int CheckAndBound();
-
-void ResetPosition();
-
-void ResetVelocity();
-
-void ZeroVariables();
-
-void GetFilterState(struct ekf_status_report *state);
-
-void GetLastErrorState(struct ekf_status_report *last_error);
-
-bool StatesNaN(struct ekf_status_report *err_report);
-void FillErrorReport(struct ekf_status_report *err);
-
-void InitializeDynamic(float (&initvelNED)[3]);
-
-uint32_t millis();
-
diff --git a/src/modules/fw_att_pos_estimator/fw_att_pos_estimator_main.cpp b/src/modules/fw_att_pos_estimator/fw_att_pos_estimator_main.cpp
deleted file mode 100644
index c9d75bce4..000000000
--- a/src/modules/fw_att_pos_estimator/fw_att_pos_estimator_main.cpp
+++ /dev/null
@@ -1,1259 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/**
- * @file fw_att_pos_estimator_main.cpp
- * Implementation of the attitude and position estimator.
- *
- * @author Paul Riseborough <p_riseborough@live.com.au>
- * @author Lorenz Meier <lm@inf.ethz.ch>
- */
-
-#include <nuttx/config.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <math.h>
-#include <poll.h>
-#include <time.h>
-#include <drivers/drv_hrt.h>
-
-#define SENSOR_COMBINED_SUB
-
-
-#include <drivers/drv_gyro.h>
-#include <drivers/drv_accel.h>
-#include <drivers/drv_mag.h>
-#include <drivers/drv_baro.h>
-#ifdef SENSOR_COMBINED_SUB
-#include <uORB/topics/sensor_combined.h>
-#endif
-#include <arch/board/board.h>
-#include <uORB/uORB.h>
-#include <uORB/topics/airspeed.h>
-#include <uORB/topics/vehicle_global_position.h>
-#include <uORB/topics/vehicle_local_position.h>
-#include <uORB/topics/vehicle_gps_position.h>
-#include <uORB/topics/vehicle_attitude.h>
-#include <uORB/topics/actuator_controls.h>
-#include <uORB/topics/vehicle_status.h>
-#include <uORB/topics/parameter_update.h>
-#include <uORB/topics/estimator_status.h>
-#include <uORB/topics/actuator_armed.h>
-#include <systemlib/param/param.h>
-#include <systemlib/err.h>
-#include <geo/geo.h>
-#include <systemlib/perf_counter.h>
-#include <systemlib/systemlib.h>
-#include <mathlib/mathlib.h>
-#include <mavlink/mavlink_log.h>
-
-#include "estimator.h"
-
-
-
-/**
- * estimator app start / stop handling function
- *
- * @ingroup apps
- */
-extern "C" __EXPORT int fw_att_pos_estimator_main(int argc, char *argv[]);
-
-__EXPORT uint32_t millis();
-
-static uint64_t last_run = 0;
-static uint64_t IMUmsec = 0;
-
-uint32_t millis()
-{
-	return IMUmsec;
-}
-
-static void print_status();
-
-class FixedwingEstimator
-{
-public:
-	/**
-	 * Constructor
-	 */
-	FixedwingEstimator();
-
-	/**
-	 * Destructor, also kills the sensors task.
-	 */
-	~FixedwingEstimator();
-
-	/**
-	 * Start the sensors task.
-	 *
-	 * @return		OK on success.
-	 */
-	int		start();
-
-private:
-
-	bool		_task_should_exit;		/**< if true, sensor task should exit */
-	int		_estimator_task;			/**< task handle for sensor task */
-#ifndef SENSOR_COMBINED_SUB
-	int		_gyro_sub;			/**< gyro sensor subscription */
-	int		_accel_sub;			/**< accel sensor subscription */
-	int		_mag_sub;			/**< mag sensor subscription */
-#else
-	int		_sensor_combined_sub;
-#endif
-	int		_airspeed_sub;			/**< airspeed subscription */
-	int		_baro_sub;			/**< barometer subscription */
-	int		_gps_sub;			/**< GPS subscription */
-	int		_vstatus_sub;			/**< vehicle status subscription */
-	int 		_params_sub;			/**< notification of parameter updates */
-	int 		_manual_control_sub;		/**< notification of manual control updates */
-	int		_mission_sub;
-
-	orb_advert_t	_att_pub;			/**< vehicle attitude */
-	orb_advert_t	_global_pos_pub;		/**< global position */
-	orb_advert_t	_local_pos_pub;			/**< position in local frame */
-	orb_advert_t	_estimator_status_pub;		/**< status of the estimator */
-
-	struct vehicle_attitude_s			_att;			/**< vehicle attitude */
-	struct gyro_report				_gyro;
-	struct accel_report				_accel;
-	struct mag_report				_mag;
-	struct airspeed_s				_airspeed;		/**< airspeed */
-	struct baro_report				_baro;			/**< baro readings */
-	struct vehicle_status_s				_vstatus;		/**< vehicle status */
-	struct vehicle_global_position_s		_global_pos;		/**< global vehicle position */
-	struct vehicle_local_position_s			_local_pos;		/**< local vehicle position */
-	struct vehicle_gps_position_s			_gps;			/**< GPS position */
-
-	struct gyro_scale				_gyro_offsets;
-	struct accel_scale				_accel_offsets;
-	struct mag_scale				_mag_offsets;
-
-#ifdef SENSOR_COMBINED_SUB
-	struct sensor_combined_s			_sensor_combined;
-#endif
-
-	float						_baro_ref;		/**< barometer reference altitude */
-	float						_baro_gps_offset;	/**< offset between GPS and baro */
-
-	perf_counter_t	_loop_perf;			/**< loop performance counter */
-	perf_counter_t	_perf_gyro;			///<local performance counter for gyro updates
-	perf_counter_t	_perf_accel;			///<local performance counter for accel updates
-	perf_counter_t	_perf_mag;			///<local performance counter for mag updates
-	perf_counter_t	_perf_gps;			///<local performance counter for gps updates
-	perf_counter_t	_perf_baro;			///<local performance counter for baro updates
-	perf_counter_t	_perf_airspeed;			///<local performance counter for airspeed updates
-
-	bool						_initialized;
-	bool						_gps_initialized;
-
-	int						_mavlink_fd;
-
-	struct {
-		int32_t	vel_delay_ms;
-		int32_t	pos_delay_ms;
-		int32_t	height_delay_ms;
-		int32_t	mag_delay_ms;
-		int32_t	tas_delay_ms;
-	}		_parameters;			/**< local copies of interesting parameters */
-
-	struct {
-		param_t vel_delay_ms;
-		param_t	pos_delay_ms;
-		param_t	height_delay_ms;
-		param_t	mag_delay_ms;
-		param_t	tas_delay_ms;
-	}		_parameter_handles;		/**< handles for interesting parameters */
-
-
-	/**
-	 * Update our local parameter cache.
-	 */
-	int		parameters_update();
-
-	/**
-	 * Update control outputs
-	 *
-	 */
-	void		control_update();
-
-	/**
-	 * Check for changes in vehicle status.
-	 */
-	void		vehicle_status_poll();
-
-	/**
-	 * Shim for calling task_main from task_create.
-	 */
-	static void	task_main_trampoline(int argc, char *argv[]);
-
-	/**
-	 * Main sensor collection task.
-	 */
-	void		task_main() __attribute__((noreturn));
-};
-
-namespace estimator
-{
-
-/* oddly, ERROR is not defined for c++ */
-#ifdef ERROR
-# undef ERROR
-#endif
-static const int ERROR = -1;
-
-FixedwingEstimator	*g_estimator;
-}
-
-FixedwingEstimator::FixedwingEstimator() :
-
-	_task_should_exit(false),
-	_estimator_task(-1),
-
-/* subscriptions */
-#ifndef SENSOR_COMBINED_SUB
-	_gyro_sub(-1),
-	_accel_sub(-1),
-	_mag_sub(-1),
-#else
-	_sensor_combined_sub(-1),
-#endif
-	_airspeed_sub(-1),
-	_baro_sub(-1),
-	_gps_sub(-1),
-	_vstatus_sub(-1),
-	_params_sub(-1),
-	_manual_control_sub(-1),
-
-/* publications */
-	_att_pub(-1),
-	_global_pos_pub(-1),
-	_local_pos_pub(-1),
-	_estimator_status_pub(-1),
-
-	_baro_ref(0.0f),
-	_baro_gps_offset(0.0f),
-
-/* performance counters */
-	_loop_perf(perf_alloc(PC_COUNT, "fw_att_pos_estimator")),
-	_perf_gyro(perf_alloc(PC_COUNT, "fw_ekf_gyro_upd")),
-	_perf_accel(perf_alloc(PC_COUNT, "fw_ekf_accel_upd")),
-	_perf_mag(perf_alloc(PC_COUNT, "fw_ekf_mag_upd")),
-	_perf_gps(perf_alloc(PC_COUNT, "fw_ekf_gps_upd")),
-	_perf_baro(perf_alloc(PC_COUNT, "fw_ekf_baro_upd")),
-	_perf_airspeed(perf_alloc(PC_COUNT, "fw_ekf_aspd_upd")),
-
-/* states */
-	_initialized(false),
-	_gps_initialized(false),
-	_mavlink_fd(-1)
-{
-
-	_mavlink_fd = open(MAVLINK_LOG_DEVICE, 0);
-
-	_parameter_handles.vel_delay_ms = param_find("PE_VEL_DELAY_MS");
-	_parameter_handles.pos_delay_ms = param_find("PE_POS_DELAY_MS");
-	_parameter_handles.height_delay_ms = param_find("PE_HGT_DELAY_MS");
-	_parameter_handles.mag_delay_ms = param_find("PE_MAG_DELAY_MS");
-	_parameter_handles.tas_delay_ms = param_find("PE_TAS_DELAY_MS");
-
-	/* fetch initial parameter values */
-	parameters_update();
-
-	/* get offsets */
-
-	int fd, res;
-
-	fd = open(GYRO_DEVICE_PATH, O_RDONLY);
-
-	if (fd > 0) {
-		res = ioctl(fd, GYROIOCGSCALE, (long unsigned int)&_gyro_offsets);
-		close(fd);
-	}
-
-	fd = open(ACCEL_DEVICE_PATH, O_RDONLY);
-
-	if (fd > 0) {
-		res = ioctl(fd, ACCELIOCGSCALE, (long unsigned int)&_accel_offsets);
-		close(fd);
-	}
-
-	fd = open(MAG_DEVICE_PATH, O_RDONLY);
-
-	if (fd > 0) {
-		res = ioctl(fd, MAGIOCGSCALE, (long unsigned int)&_mag_offsets);
-		close(fd);
-	}
-}
-
-FixedwingEstimator::~FixedwingEstimator()
-{
-	if (_estimator_task != -1) {
-
-		/* task wakes up every 100ms or so at the longest */
-		_task_should_exit = true;
-
-		/* wait for a second for the task to quit at our request */
-		unsigned i = 0;
-
-		do {
-			/* wait 20ms */
-			usleep(20000);
-
-			/* if we have given up, kill it */
-			if (++i > 50) {
-				task_delete(_estimator_task);
-				break;
-			}
-		} while (_estimator_task != -1);
-	}
-
-	estimator::g_estimator = nullptr;
-}
-
-int
-FixedwingEstimator::parameters_update()
-{
-
-	param_get(_parameter_handles.vel_delay_ms, &(_parameters.vel_delay_ms));
-	param_get(_parameter_handles.pos_delay_ms, &(_parameters.pos_delay_ms));
-	param_get(_parameter_handles.height_delay_ms, &(_parameters.height_delay_ms));
-	param_get(_parameter_handles.mag_delay_ms, &(_parameters.mag_delay_ms));
-	param_get(_parameter_handles.tas_delay_ms, &(_parameters.tas_delay_ms));
-
-	return OK;
-}
-
-void
-FixedwingEstimator::vehicle_status_poll()
-{
-	bool vstatus_updated;
-
-	/* Check HIL state if vehicle status has changed */
-	orb_check(_vstatus_sub, &vstatus_updated);
-
-	if (vstatus_updated) {
-
-		orb_copy(ORB_ID(vehicle_status), _vstatus_sub, &_vstatus);
-	}
-}
-
-void
-FixedwingEstimator::task_main_trampoline(int argc, char *argv[])
-{
-	estimator::g_estimator->task_main();
-}
-
-float dt = 0.0f; // time lapsed since last covariance prediction
-
-void
-FixedwingEstimator::task_main()
-{
-
-	/*
-	 * do subscriptions
-	 */
-	_baro_sub = orb_subscribe(ORB_ID(sensor_baro));
-	_airspeed_sub = orb_subscribe(ORB_ID(airspeed));
-	_gps_sub = orb_subscribe(ORB_ID(vehicle_gps_position));
-	_vstatus_sub = orb_subscribe(ORB_ID(vehicle_status));
-	_params_sub = orb_subscribe(ORB_ID(parameter_update));
-
-	/* rate limit vehicle status updates to 5Hz */
-	orb_set_interval(_vstatus_sub, 200);
-
-#ifndef SENSOR_COMBINED_SUB
-
-	_gyro_sub = orb_subscribe(ORB_ID(sensor_gyro));
-	_accel_sub = orb_subscribe(ORB_ID(sensor_accel));
-	_mag_sub = orb_subscribe(ORB_ID(sensor_mag));
-
-	/* rate limit gyro updates to 50 Hz */
-	/* XXX remove this!, BUT increase the data buffer size! */
-	orb_set_interval(_gyro_sub, 4);
-#else
-	_sensor_combined_sub = orb_subscribe(ORB_ID(sensor_combined));
-	/* XXX remove this!, BUT increase the data buffer size! */
-	orb_set_interval(_sensor_combined_sub, 4);
-#endif
-
-	parameters_update();
-
-	/* set initial filter state */
-	fuseVelData = false;
-	fusePosData = false;
-	fuseHgtData = false;
-	fuseMagData = false;
-	fuseVtasData = false;
-	statesInitialised = false;
-
-	/* initialize measurement data */
-	VtasMeas = 0.0f;
-	Vector3f lastAngRate = {0.0f, 0.0f, 0.0f};
-	Vector3f lastAccel = {0.0f, 0.0f, -9.81f};
-	dVelIMU.x = 0.0f;
-	dVelIMU.y = 0.0f;
-	dVelIMU.z = 0.0f;
-	dAngIMU.x = 0.0f;
-	dAngIMU.y = 0.0f;
-	dAngIMU.z = 0.0f;
-
-	/* wakeup source(s) */
-	struct pollfd fds[2];
-
-	/* Setup of loop */
-	fds[0].fd = _params_sub;
-	fds[0].events = POLLIN;
-#ifndef SENSOR_COMBINED_SUB
-	fds[1].fd = _gyro_sub;
-	fds[1].events = POLLIN;
-#else
-	fds[1].fd = _sensor_combined_sub;
-	fds[1].events = POLLIN;
-#endif
-
-	hrt_abstime start_time = hrt_absolute_time();
-
-	bool newDataGps = false;
-	bool newAdsData = false;
-	bool newDataMag = false;
-
-	while (!_task_should_exit) {
-
-		/* wait for up to 500ms for data */
-		int pret = poll(&fds[0], (sizeof(fds) / sizeof(fds[0])), 100);
-
-		/* timed out - periodic check for _task_should_exit, etc. */
-		if (pret == 0)
-			continue;
-
-		/* this is undesirable but not much we can do - might want to flag unhappy status */
-		if (pret < 0) {
-			warn("poll error %d, %d", pret, errno);
-			continue;
-		}
-
-		perf_begin(_loop_perf);
-
-		/* only update parameters if they changed */
-		if (fds[0].revents & POLLIN) {
-			/* read from param to clear updated flag */
-			struct parameter_update_s update;
-			orb_copy(ORB_ID(parameter_update), _params_sub, &update);
-
-			/* update parameters from storage */
-			parameters_update();
-		}
-
-		/* only run estimator if gyro updated */
-		if (fds[1].revents & POLLIN) {
-
-			/* check vehicle status for changes to publication state */
-			vehicle_status_poll();
-
-			bool accel_updated;
-			bool mag_updated;
-
-			perf_count(_perf_gyro);
-
-			/**
-			 *    PART ONE: COLLECT ALL DATA
-			 **/
-
-			hrt_abstime last_sensor_timestamp;
-
-			/* load local copies */
-#ifndef SENSOR_COMBINED_SUB
-			orb_copy(ORB_ID(sensor_gyro), _gyro_sub, &_gyro);
-
-
-			orb_check(_accel_sub, &accel_updated);
-
-			if (accel_updated) {
-				perf_count(_perf_accel);
-				orb_copy(ORB_ID(sensor_accel), _accel_sub, &_accel);
-			}
-
-			last_sensor_timestamp = _gyro.timestamp;
-			IMUmsec = _gyro.timestamp / 1e3f;
-
-			float deltaT = (_gyro.timestamp - last_run) / 1e6f;
-			last_run = _gyro.timestamp;
-
-			/* guard against too large deltaT's */
-			if (deltaT > 1.0f)
-				deltaT = 0.01f;
-
-
-			// Always store data, independent of init status
-			/* fill in last data set */
-			dtIMU = deltaT;
-
-			angRate.x = _gyro.x;
-			angRate.y = _gyro.y;
-			angRate.z = _gyro.z;
-
-			accel.x = _accel.x;
-			accel.y = _accel.y;
-			accel.z = _accel.z;
-
-			dAngIMU = 0.5f * (angRate + lastAngRate) * dtIMU;
-			lastAngRate = angRate;
-			dVelIMU = 0.5f * (accel + lastAccel) * dtIMU;
-			lastAccel = accel;
-
-
-#else
-			orb_copy(ORB_ID(sensor_combined), _sensor_combined_sub, &_sensor_combined);
-
-			static hrt_abstime last_accel = 0;
-			static hrt_abstime last_mag = 0;
-
-			if (last_accel != _sensor_combined.accelerometer_timestamp) {
-				accel_updated = true;
-			}
-
-			last_accel = _sensor_combined.accelerometer_timestamp;
-
-
-			// Copy gyro and accel
-			last_sensor_timestamp = _sensor_combined.timestamp;
-			IMUmsec = _sensor_combined.timestamp / 1e3f;
-
-			float deltaT = (_sensor_combined.timestamp - last_run) / 1e6f;
-			last_run = _sensor_combined.timestamp;
-
-			/* guard against too large deltaT's */
-			if (deltaT > 1.0f || deltaT < 0.000001f)
-				deltaT = 0.01f;
-
-			// Always store data, independent of init status
-			/* fill in last data set */
-			dtIMU = deltaT;
-
-			angRate.x = _sensor_combined.gyro_rad_s[0];
-			angRate.y = _sensor_combined.gyro_rad_s[1];
-			angRate.z = _sensor_combined.gyro_rad_s[2];
-
-			accel.x = _sensor_combined.accelerometer_m_s2[0];
-			accel.y = _sensor_combined.accelerometer_m_s2[1];
-			accel.z = _sensor_combined.accelerometer_m_s2[2];
-
-			dAngIMU = 0.5f * (angRate + lastAngRate) * dtIMU;
-			lastAngRate = angRate;
-			dVelIMU = 0.5f * (accel + lastAccel) * dtIMU;
-			lastAccel = accel;
-
-			if (last_mag != _sensor_combined.magnetometer_timestamp) {
-				mag_updated = true;
-				newDataMag = true;
-
-			} else {
-				newDataMag = false;
-			}
-
-			last_mag = _sensor_combined.magnetometer_timestamp;
-
-#endif
-
-			bool airspeed_updated;
-			orb_check(_airspeed_sub, &airspeed_updated);
-
-			if (airspeed_updated) {
-				orb_copy(ORB_ID(airspeed), _airspeed_sub, &_airspeed);
-				perf_count(_perf_airspeed);
-
-				VtasMeas = _airspeed.true_airspeed_m_s;
-				newAdsData = true;
-
-			} else {
-				newAdsData = false;
-			}
-
-			bool gps_updated;
-			orb_check(_gps_sub, &gps_updated);
-
-			if (gps_updated) {
-
-				uint64_t last_gps = _gps.timestamp_position;
-
-				orb_copy(ORB_ID(vehicle_gps_position), _gps_sub, &_gps);
-				perf_count(_perf_gps);
-
-				if (_gps.fix_type < 3) {
-					gps_updated = false;
-					newDataGps = false;
-
-				} else {
-
-					/* check if we had a GPS outage for a long time */
-					if (hrt_elapsed_time(&last_gps) > 5 * 1000 * 1000) {
-						ResetPosition();
-						ResetVelocity();
-						ResetStoredStates();
-					}
-
-					/* fuse GPS updates */
-
-					//_gps.timestamp / 1e3;
-					GPSstatus = _gps.fix_type;
-					velNED[0] = _gps.vel_n_m_s;
-					velNED[1] = _gps.vel_e_m_s;
-					velNED[2] = _gps.vel_d_m_s;
-
-					// warnx("GPS updated: status: %d, vel: %8.4f %8.4f %8.4f", (int)GPSstatus, velNED[0], velNED[1], velNED[2]);
-
-					gpsLat = math::radians(_gps.lat / (double)1e7);
-					gpsLon = math::radians(_gps.lon / (double)1e7) - M_PI;
-					gpsHgt = _gps.alt / 1e3f;
-					newDataGps = true;
-
-				}
-
-			}
-
-			bool baro_updated;
-			orb_check(_baro_sub, &baro_updated);
-
-			if (baro_updated) {
-				orb_copy(ORB_ID(sensor_baro), _baro_sub, &_baro);
-
-				baroHgt = _baro.altitude - _baro_ref;
-
-				// Could use a blend of GPS and baro alt data if desired
-				hgtMea = 1.0f * baroHgt + 0.0f * gpsHgt;
-			}
-
-#ifndef SENSOR_COMBINED_SUB
-			orb_check(_mag_sub, &mag_updated);
-#endif
-
-			if (mag_updated) {
-
-				perf_count(_perf_mag);
-
-#ifndef SENSOR_COMBINED_SUB
-				orb_copy(ORB_ID(sensor_mag), _mag_sub, &_mag);
-
-				// XXX we compensate the offsets upfront - should be close to zero.
-				// 0.001f
-				magData.x = _mag.x;
-				magBias.x = 0.000001f; // _mag_offsets.x_offset
-
-				magData.y = _mag.y;
-				magBias.y = 0.000001f; // _mag_offsets.y_offset
-
-				magData.z = _mag.z;
-				magBias.z = 0.000001f; // _mag_offsets.y_offset
-
-#else
-
-				// XXX we compensate the offsets upfront - should be close to zero.
-				// 0.001f
-				magData.x = _sensor_combined.magnetometer_ga[0];
-				magBias.x = 0.000001f; // _mag_offsets.x_offset
-
-				magData.y = _sensor_combined.magnetometer_ga[1];
-				magBias.y = 0.000001f; // _mag_offsets.y_offset
-
-				magData.z = _sensor_combined.magnetometer_ga[2];
-				magBias.z = 0.000001f; // _mag_offsets.y_offset
-
-#endif
-
-				newDataMag = true;
-
-			} else {
-				newDataMag = false;
-			}
-
-
-			/**
-			 *    CHECK IF THE INPUT DATA IS SANE
-			 */
-			int check = CheckAndBound();
-
-			switch (check) {
-				case 0:
-					/* all ok */
-					break;
-				case 1:
-				{
-					const char* str = "NaN in states, resetting";
-					warnx(str);
-					mavlink_log_critical(_mavlink_fd, str);
-					break;
-				}
-				case 2:
-				{
-					const char* str = "stale IMU data, resetting";
-					warnx(str);
-					mavlink_log_critical(_mavlink_fd, str);
-					break;
-				}
-				case 3:
-				{
-					const char* str = "switching dynamic / static state";
-					warnx(str);
-					mavlink_log_critical(_mavlink_fd, str);
-					break;
-				}
-			}
-
-			// If non-zero, we got a problem
-			if (check) {
-
-				struct ekf_status_report ekf_report;
-
-				GetLastErrorState(&ekf_report);
-
-				struct estimator_status_report rep;
-				memset(&rep, 0, sizeof(rep));
-				rep.timestamp = hrt_absolute_time();
-
-				rep.states_nan = ekf_report.statesNaN;
-				rep.covariance_nan = ekf_report.covarianceNaN;
-				rep.kalman_gain_nan = ekf_report.kalmanGainsNaN;
-
-				// Copy all states or at least all that we can fit
-				int i = 0;
-				unsigned ekf_n_states = (sizeof(ekf_report.states) / sizeof(ekf_report.states[0]));
-				unsigned max_states = (sizeof(rep.states) / sizeof(rep.states[0]));
-				rep.n_states = (ekf_n_states < max_states) ? ekf_n_states : max_states;
-
-				while ((i < ekf_n_states) && (i < max_states)) {
-
-					rep.states[i] = ekf_report.states[i];
-					i++;
-				}
-
-				if (_estimator_status_pub > 0) {
-					orb_publish(ORB_ID(estimator_status), _estimator_status_pub, &rep);
-				} else {
-					_estimator_status_pub = orb_advertise(ORB_ID(estimator_status), &rep);
-				}
-			}
-
-
-			/**
-			 *    PART TWO: EXECUTE THE FILTER
-			 **/
-
-			// Wait long enough to ensure all sensors updated once
-			// XXX we rather want to check all updated
-
-
-			if (hrt_elapsed_time(&start_time) > 100000) {
-
-				if (!_gps_initialized && (GPSstatus == 3)) {
-					velNED[0] = _gps.vel_n_m_s;
-					velNED[1] = _gps.vel_e_m_s;
-					velNED[2] = _gps.vel_d_m_s;
-
-					double lat = _gps.lat * 1e-7;
-					double lon = _gps.lon * 1e-7;
-					float alt = _gps.alt * 1e-3;
-
-					InitialiseFilter(velNED);
-
-					// Initialize projection
-					_local_pos.ref_lat = _gps.lat;
-					_local_pos.ref_lon = _gps.lon;
-					_local_pos.ref_alt = alt;
-					_local_pos.ref_timestamp = _gps.timestamp_position;
-
-					// Store 
-					orb_copy(ORB_ID(sensor_baro), _baro_sub, &_baro);
-					_baro_ref = _baro.altitude;
-					baroHgt = _baro.altitude - _baro_ref;
-					_baro_gps_offset = _baro_ref - _local_pos.ref_alt;
-
-					// XXX this is not multithreading safe
-					map_projection_init(lat, lon);
-					mavlink_log_info(_mavlink_fd, "[position estimator] init ref: lat=%.7f, lon=%.7f, alt=%.2f", lat, lon, alt);
-
-					_gps_initialized = true;
-
-				} else if (!statesInitialised) {
-					velNED[0] = 0.0f;
-					velNED[1] = 0.0f;
-					velNED[2] = 0.0f;
-					posNED[0] = 0.0f;
-					posNED[1] = 0.0f;
-					posNED[2] = 0.0f;
-
-					posNE[0] = posNED[0];
-					posNE[1] = posNED[1];
-					InitialiseFilter(velNED);
-				}
-			}
-
-			// If valid IMU data and states initialised, predict states and covariances
-			if (statesInitialised) {
-				// Run the strapdown INS equations every IMU update
-				UpdateStrapdownEquationsNED();
-#if 0
-				// debug code - could be tunred into a filter mnitoring/watchdog function
-				float tempQuat[4];
-
-				for (uint8_t j = 0; j <= 3; j++) tempQuat[j] = states[j];
-
-				quat2eul(eulerEst, tempQuat);
-
-				for (uint8_t j = 0; j <= 2; j++) eulerDif[j] = eulerEst[j] - ahrsEul[j];
-
-				if (eulerDif[2] > pi) eulerDif[2] -= 2 * pi;
-
-				if (eulerDif[2] < -pi) eulerDif[2] += 2 * pi;
-
-#endif
-				// store the predicted states for subsequent use by measurement fusion
-				StoreStates(IMUmsec);
-				// Check if on ground - status is used by covariance prediction
-				OnGroundCheck();
-				// sum delta angles and time used by covariance prediction
-				summedDelAng = summedDelAng + correctedDelAng;
-				summedDelVel = summedDelVel + dVelIMU;
-				dt += dtIMU;
-
-				// perform a covariance prediction if the total delta angle has exceeded the limit
-				// or the time limit will be exceeded at the next IMU update
-				if ((dt >= (covTimeStepMax - dtIMU)) || (summedDelAng.length() > covDelAngMax)) {
-					CovariancePrediction(dt);
-					summedDelAng = summedDelAng.zero();
-					summedDelVel = summedDelVel.zero();
-					dt = 0.0f;
-				}
-
-				_initialized = true;
-			}
-
-			// Fuse GPS Measurements
-			if (newDataGps && _gps_initialized) {
-				// Convert GPS measurements to Pos NE, hgt and Vel NED
-				velNED[0] = _gps.vel_n_m_s;
-				velNED[1] = _gps.vel_e_m_s;
-				velNED[2] = _gps.vel_d_m_s;
-				calcposNED(posNED, gpsLat, gpsLon, gpsHgt, latRef, lonRef, hgtRef);
-
-				posNE[0] = posNED[0];
-				posNE[1] = posNED[1];
-				// set fusion flags
-				fuseVelData = true;
-				fusePosData = true;
-				// recall states stored at time of measurement after adjusting for delays
-				RecallStates(statesAtVelTime, (IMUmsec - _parameters.vel_delay_ms));
-				RecallStates(statesAtPosTime, (IMUmsec - _parameters.pos_delay_ms));
-				// run the fusion step
-				FuseVelposNED();
-
-			} else if (statesInitialised) {
-				// Convert GPS measurements to Pos NE, hgt and Vel NED
-				velNED[0] = 0.0f;
-				velNED[1] = 0.0f;
-				velNED[2] = 0.0f;
-				posNED[0] = 0.0f;
-				posNED[1] = 0.0f;
-				posNED[2] = 0.0f;
-
-				posNE[0] = posNED[0];
-				posNE[1] = posNED[1];
-				// set fusion flags
-				fuseVelData = true;
-				fusePosData = true;
-				// recall states stored at time of measurement after adjusting for delays
-				RecallStates(statesAtVelTime, (IMUmsec - _parameters.vel_delay_ms));
-				RecallStates(statesAtPosTime, (IMUmsec - _parameters.pos_delay_ms));
-				// run the fusion step
-				FuseVelposNED();
-
-			} else {
-				fuseVelData = false;
-				fusePosData = false;
-			}
-
-			if (newAdsData && statesInitialised) {
-				// Could use a blend of GPS and baro alt data if desired
-				hgtMea = 1.0f * baroHgt + 0.0f * gpsHgt;
-				fuseHgtData = true;
-				// recall states stored at time of measurement after adjusting for delays
-				RecallStates(statesAtHgtTime, (IMUmsec - _parameters.height_delay_ms));
-				// run the fusion step
-				FuseVelposNED();
-
-			} else {
-				fuseHgtData = false;
-			}
-
-			// Fuse Magnetometer Measurements
-			if (newDataMag && statesInitialised) {
-				fuseMagData = true;
-				RecallStates(statesAtMagMeasTime, (IMUmsec - _parameters.mag_delay_ms)); // Assume 50 msec avg delay for magnetometer data
-
-			} else {
-				fuseMagData = false;
-			}
-
-			if (statesInitialised) FuseMagnetometer();
-
-			// Fuse Airspeed Measurements
-			if (newAdsData && statesInitialised && VtasMeas > 8.0f) {
-				fuseVtasData = true;
-				RecallStates(statesAtVtasMeasTime, (IMUmsec - _parameters.tas_delay_ms)); // assume 100 msec avg delay for airspeed data
-				FuseAirspeed();
-
-			} else {
-				fuseVtasData = false;
-			}
-
-			// Publish results
-			if (_initialized) {
-
-
-
-				// State vector:
-				// 0-3: quaternions (q0, q1, q2, q3)
-				// 4-6: Velocity - m/sec (North, East, Down)
-				// 7-9: Position - m (North, East, Down)
-				// 10-12: Delta Angle bias - rad (X,Y,Z)
-				// 13-14: Wind Vector  - m/sec (North,East)
-				// 15-17: Earth Magnetic Field Vector - milligauss (North, East, Down)
-				// 18-20: Body Magnetic Field Vector - milligauss (X,Y,Z)
-
-				math::Quaternion q(states[0], states[1], states[2], states[3]);
-				math::Matrix<3, 3> R = q.to_dcm();
-				math::Vector<3> euler = R.to_euler();
-
-				for (int i = 0; i < 3; i++) for (int j = 0; j < 3; j++)
-						_att.R[i][j] = R(i, j);
-
-				_att.timestamp = last_sensor_timestamp;
-				_att.q[0] = states[0];
-				_att.q[1] = states[1];
-				_att.q[2] = states[2];
-				_att.q[3] = states[3];
-				_att.q_valid = true;
-				_att.R_valid = true;
-
-				_att.timestamp = last_sensor_timestamp;
-				_att.roll = euler(0);
-				_att.pitch = euler(1);
-				_att.yaw = euler(2);
-
-				_att.rollspeed = angRate.x - states[10];
-				_att.pitchspeed = angRate.y - states[11];
-				_att.yawspeed = angRate.z - states[12];
-				// gyro offsets
-				_att.rate_offsets[0] = states[10];
-				_att.rate_offsets[1] = states[11];
-				_att.rate_offsets[2] = states[12];
-
-				/* lazily publish the attitude only once available */
-				if (_att_pub > 0) {
-					/* publish the attitude setpoint */
-					orb_publish(ORB_ID(vehicle_attitude), _att_pub, &_att);
-
-				} else {
-					/* advertise and publish */
-					_att_pub = orb_advertise(ORB_ID(vehicle_attitude), &_att);
-				}
-			}
-
-			if (!isfinite(states[0])) {
-				print_status();
-				_exit(0);
-			}
-
-			if (_gps_initialized) {
-				_local_pos.timestamp = last_sensor_timestamp;
-				_local_pos.x = states[7];
-				_local_pos.y = states[8];
-				_local_pos.z = states[9];
-
-				_local_pos.vx = states[4];
-				_local_pos.vy = states[5];
-				_local_pos.vz = states[6];
-
-				_local_pos.xy_valid = _gps_initialized;
-				_local_pos.z_valid = true;
-				_local_pos.v_xy_valid = _gps_initialized;
-				_local_pos.v_z_valid = true;
-				_local_pos.xy_global = true;
-
-				_local_pos.z_global = false;
-				_local_pos.yaw = _att.yaw;
-
-				/* lazily publish the local position only once available */
-				if (_local_pos_pub > 0) {
-					/* publish the attitude setpoint */
-					orb_publish(ORB_ID(vehicle_local_position), _local_pos_pub, &_local_pos);
-
-				} else {
-					/* advertise and publish */
-					_local_pos_pub = orb_advertise(ORB_ID(vehicle_local_position), &_local_pos);
-				}
-
-				_global_pos.timestamp = _local_pos.timestamp;
-
-				_global_pos.baro_valid = true;
-				_global_pos.global_valid = true;
-
-				if (_local_pos.xy_global) {
-					double est_lat, est_lon;
-					map_projection_reproject(_local_pos.x, _local_pos.y, &est_lat, &est_lon);
-					_global_pos.lat = est_lat;
-					_global_pos.lon = est_lon;
-					_global_pos.time_gps_usec = _gps.time_gps_usec;
-				}
-
-				/* set valid values even if position is not valid */
-				if (_local_pos.v_xy_valid) {
-					_global_pos.vel_n = _local_pos.vx;
-					_global_pos.vel_e = _local_pos.vy;
-				} else {
-					_global_pos.vel_n = 0.0f;
-					_global_pos.vel_e = 0.0f;
-				}
-
-				/* local pos alt is negative, change sign and add alt offset */
-				_global_pos.alt = _local_pos.ref_alt + (-_local_pos.z);
-
-				if (_local_pos.z_valid) {
-					_global_pos.baro_alt = _local_pos.ref_alt - _baro_gps_offset - _local_pos.z;
-				}
-
-				if (_local_pos.v_z_valid) {
-					_global_pos.vel_d = _local_pos.vz;
-				}
-
-				_global_pos.yaw = _local_pos.yaw;
-
-				_global_pos.timestamp = _local_pos.timestamp;
-
-				/* lazily publish the global position only once available */
-				if (_global_pos_pub > 0) {
-					/* publish the attitude setpoint */
-					orb_publish(ORB_ID(vehicle_global_position), _global_pos_pub, &_global_pos);
-
-				} else {
-					/* advertise and publish */
-					_global_pos_pub = orb_advertise(ORB_ID(vehicle_global_position), &_global_pos);
-				}
-			}
-
-		}
-
-		perf_end(_loop_perf);
-	}
-
-	warnx("exiting.\n");
-
-	_estimator_task = -1;
-	_exit(0);
-}
-
-int
-FixedwingEstimator::start()
-{
-	ASSERT(_estimator_task == -1);
-
-	/* start the task */
-	_estimator_task = task_spawn_cmd("fw_att_pos_estimator",
-					 SCHED_DEFAULT,
-					 SCHED_PRIORITY_MAX - 40,
-					 6000,
-					 (main_t)&FixedwingEstimator::task_main_trampoline,
-					 nullptr);
-
-	if (_estimator_task < 0) {
-		warn("task start failed");
-		return -errno;
-	}
-
-	return OK;
-}
-
-void print_status()
-{
-	math::Quaternion q(states[0], states[1], states[2], states[3]);
-	math::Matrix<3, 3> R = q.to_dcm();
-	math::Vector<3> euler = R.to_euler();
-
-	printf("attitude: roll: %8.4f, pitch %8.4f, yaw: %8.4f degrees\n",
-	       (double)math::degrees(euler(0)), (double)math::degrees(euler(1)), (double)math::degrees(euler(2)));
-
-	// State vector:
-	// 0-3: quaternions (q0, q1, q2, q3)
-	// 4-6: Velocity - m/sec (North, East, Down)
-	// 7-9: Position - m (North, East, Down)
-	// 10-12: Delta Angle bias - rad (X,Y,Z)
-	// 13-14: Wind Vector  - m/sec (North,East)
-	// 15-17: Earth Magnetic Field Vector - gauss (North, East, Down)
-	// 18-20: Body Magnetic Field Vector - gauss (X,Y,Z)
-
-	printf("dtIMU: %8.6f dt: %8.6f IMUmsec: %d\n", dtIMU, dt, (int)IMUmsec);
-	printf("dvel: %8.6f %8.6f %8.6f accel: %8.6f %8.6f %8.6f\n", (double)dVelIMU.x, (double)dVelIMU.y, (double)dVelIMU.z, (double)accel.x, (double)accel.y, (double)accel.z);
-	printf("dang: %8.4f %8.4f %8.4f dang corr: %8.4f %8.4f %8.4f\n" , (double)dAngIMU.x, (double)dAngIMU.y, (double)dAngIMU.z, (double)correctedDelAng.x, (double)correctedDelAng.y, (double)correctedDelAng.z);
-	printf("states (quat)        [1-4]: %8.4f, %8.4f, %8.4f, %8.4f\n", (double)states[0], (double)states[1], (double)states[2], (double)states[3]);
-	printf("states (vel m/s)     [5-7]: %8.4f, %8.4f, %8.4f\n", (double)states[4], (double)states[5], (double)states[6]);
-	printf("states (pos m)      [8-10]: %8.4f, %8.4f, %8.4f\n", (double)states[7], (double)states[8], (double)states[9]);
-	printf("states (delta ang) [11-13]: %8.4f, %8.4f, %8.4f\n", (double)states[10], (double)states[11], (double)states[12]);
-	printf("states (wind)      [14-15]: %8.4f, %8.4f\n", (double)states[13], (double)states[14]);
-	printf("states (earth mag) [16-18]: %8.4f, %8.4f, %8.4f\n", (double)states[15], (double)states[16], (double)states[17]);
-	printf("states (body mag)  [19-21]: %8.4f, %8.4f, %8.4f\n", (double)states[18], (double)states[19], (double)states[20]);
-	printf("states: %s %s %s %s %s %s %s %s %s %s\n",
-	       (statesInitialised) ? "INITIALIZED" : "NON_INIT",
-	       (onGround) ? "ON_GROUND" : "AIRBORNE",
-	       (fuseVelData) ? "FUSE_VEL" : "INH_VEL",
-	       (fusePosData) ? "FUSE_POS" : "INH_POS",
-	       (fuseHgtData) ? "FUSE_HGT" : "INH_HGT",
-	       (fuseMagData) ? "FUSE_MAG" : "INH_MAG",
-	       (fuseVtasData) ? "FUSE_VTAS" : "INH_VTAS",
-	       (useAirspeed) ? "USE_AIRSPD" : "IGN_AIRSPD",
-	       (useCompass) ? "USE_COMPASS" : "IGN_COMPASS",
-	       (staticMode) ? "STATIC_MODE" : "DYNAMIC_MODE");
-}
-
-int trip_nan() {
-
-	int ret = 0;
-
-	// If system is not armed, inject a NaN value into the filter
-	int armed_sub = orb_subscribe(ORB_ID(actuator_armed));
-
-	struct actuator_armed_s armed;
-	orb_copy(ORB_ID(actuator_armed), armed_sub, &armed);
-
-	if (armed.armed) {
-		warnx("ACTUATORS ARMED! NOT TRIPPING SYSTEM");
-		ret = 1;
-	} else {
-
-		float nan_val = 0.0f / 0.0f;
-
-		warnx("system not armed, tripping state vector with NaN values");
-		states[5] = nan_val;
-		usleep(100000);
-
-		// warnx("tripping covariance #1 with NaN values");
-		// KH[2][2] = nan_val; //  intermediate result used for covariance updates
-		// usleep(100000);
-
-		// warnx("tripping covariance #2 with NaN values");
-		// KHP[5][5] = nan_val; // intermediate result used for covariance updates
-		// usleep(100000);
-
-		warnx("tripping covariance #3 with NaN values");
-		P[3][3] = nan_val; // covariance matrix
-		usleep(100000);
-
-		warnx("tripping Kalman gains with NaN values");
-		Kfusion[0] = nan_val; // Kalman gains
-		usleep(100000);
-
-		warnx("tripping stored states[0] with NaN values");
-		storedStates[0][0] = nan_val;
-		usleep(100000);
-
-		warnx("\nDONE - FILTER STATE:");
-		print_status();
-	}
-
-	close(armed_sub);
-	return ret;
-}
-
-int fw_att_pos_estimator_main(int argc, char *argv[])
-{
-	if (argc < 1)
-		errx(1, "usage: fw_att_pos_estimator {start|stop|status}");
-
-	if (!strcmp(argv[1], "start")) {
-
-		if (estimator::g_estimator != nullptr)
-			errx(1, "already running");
-
-		estimator::g_estimator = new FixedwingEstimator;
-
-		if (estimator::g_estimator == nullptr)
-			errx(1, "alloc failed");
-
-		if (OK != estimator::g_estimator->start()) {
-			delete estimator::g_estimator;
-			estimator::g_estimator = nullptr;
-			err(1, "start failed");
-		}
-
-		exit(0);
-	}
-
-	if (!strcmp(argv[1], "stop")) {
-		if (estimator::g_estimator == nullptr)
-			errx(1, "not running");
-
-		delete estimator::g_estimator;
-		estimator::g_estimator = nullptr;
-		exit(0);
-	}
-
-	if (!strcmp(argv[1], "status")) {
-		if (estimator::g_estimator) {
-			warnx("running");
-
-			print_status();
-
-			exit(0);
-
-		} else {
-			errx(1, "not running");
-		}
-	}
-
-	if (!strcmp(argv[1], "trip")) {
-		if (estimator::g_estimator) {
-			int ret = trip_nan();
-
-			exit(ret);
-
-		} else {
-			errx(1, "not running");
-		}
-	}
-
-	warnx("unrecognized command");
-	return 1;
-}
diff --git a/src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp b/src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp
index 7f13df785..000c02e3d 100644
--- a/src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp
+++ b/src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp
@@ -43,8 +43,8 @@
  *    Proceedings of the AIAA Guidance, Navigation and Control
  *    Conference, Aug 2004. AIAA-2004-4900.
  *
- * Original implementation for total energy control class:
- *    Paul Riseborough and Andrew Tridgell, 2013 (code in lib/external_lgpl)
+ * Implementation for total energy control class:
+ *    Thomas Gubler
  *
  * More details and acknowledgements in the referenced library headers.
  *
@@ -88,8 +88,9 @@
 #include <mavlink/mavlink_log.h>
 #include <launchdetection/LaunchDetector.h>
 #include <ecl/l1/ecl_l1_pos_controller.h>
-#include <external_lgpl/tecs/tecs.h>
+#include <drivers/drv_range_finder.h>
 #include "landingslope.h"
+#include "mtecs/mTecs.h"
 
 
 /**
@@ -134,6 +135,7 @@ private:
 	int 		_params_sub;			/**< notification of parameter updates */
 	int 		_manual_control_sub;		/**< notification of manual control updates */
 	int		_sensor_combined_sub;		/**< for body frame accelerations */
+	int		_range_finder_sub;		/**< range finder subscription */
 
 	orb_advert_t	_attitude_sp_pub;		/**< attitude setpoint */
 	orb_advert_t	_nav_capabilities_pub;		/**< navigation capabilities publication */
@@ -147,13 +149,12 @@ private:
 	struct vehicle_global_position_s		_global_pos;			/**< global vehicle position */
 	struct position_setpoint_triplet_s		_pos_sp_triplet;		/**< triplet of mission items */
 	struct sensor_combined_s			_sensor_combined;		/**< for body frame accelerations */
+	struct range_finder_report 			_range_finder;			/**< range finder report */
 
 	perf_counter_t	_loop_perf;			/**< loop performance counter */
 
-	bool		_setpoint_valid;		/**< flag if the position control setpoint is valid */
-
 	/** manual control states */
-	float		_seatbelt_hold_heading;		/**< heading the system should hold in seatbelt mode */
+	float		_altctrl_hold_heading;		/**< heading the system should hold in altctrl mode */
 	double		_loiter_hold_lat;
 	double		_loiter_hold_lon;
 	float		_loiter_hold_alt;
@@ -181,7 +182,7 @@ private:
 	/* Landingslope object */
 	Landingslope landingslope;
 
-	float flare_curve_alt_last;
+	float flare_curve_alt_rel_last;
 	/* heading hold */
 	float target_bearing;
 
@@ -197,7 +198,8 @@ private:
 	math::Matrix<3, 3> _R_nb;			///< current attitude
 
 	ECL_L1_Pos_Controller				_l1_control;
-	TECS						_tecs;
+	fwPosctrl::mTecs				_mTecs;
+	bool						_was_pos_control_mode;
 
 	struct {
 		float l1_period;
@@ -229,8 +231,6 @@ private:
 
 		float throttle_land_max;
 
-		float loiter_hold_radius;
-
 		float heightrate_p;
 		float speedrate_p;
 
@@ -239,6 +239,7 @@ private:
 		float land_flare_alt_relative;
 		float land_thrust_lim_alt_relative;
 		float land_heading_hold_horizontal_distance;
+		float range_finder_rel_alt;
 
 	}		_parameters;			/**< local copies of interesting parameters */
 
@@ -273,8 +274,6 @@ private:
 
 		param_t throttle_land_max;
 
-		param_t loiter_hold_radius;
-
 		param_t heightrate_p;
 		param_t speedrate_p;
 
@@ -283,6 +282,7 @@ private:
 		param_t land_flare_alt_relative;
 		param_t land_thrust_lim_alt_relative;
 		param_t land_heading_hold_horizontal_distance;
+		param_t range_finder_rel_alt;
 
 	}		_parameter_handles;		/**< handles for interesting parameters */
 
@@ -309,6 +309,12 @@ private:
 	bool		vehicle_airspeed_poll();
 
 	/**
+	 * Check for range finder updates.
+	 */
+	bool		range_finder_poll();
+
+
+	/**
 	 * Check for position updates.
 	 */
 	void		vehicle_attitude_poll();
@@ -329,13 +335,18 @@ private:
 	void navigation_capabilities_publish();
 
 	/**
+	 * Get the relative alt either from the difference between estimate and waypoint or from the laser range finder
+	 */
+	float get_relative_landingalt(float land_setpoint_alt, float current_alt, const struct range_finder_report &range_finder, float range_finder_use_relative_alt);
+
+	/**
 	 * Control position.
 	 */
-	bool		control_position(const math::Vector<2> &global_pos, const math::Vector<2> &ground_speed,
+	bool		control_position(const math::Vector<2> &global_pos, const math::Vector<3> &ground_speed,
 					 const struct position_setpoint_triplet_s &_pos_sp_triplet);
 
 	float calculate_target_airspeed(float airspeed_demand);
-	void calculate_gndspeed_undershoot(const math::Vector<2> &current_position, const math::Vector<2> &ground_speed, const struct position_setpoint_triplet_s &pos_sp_triplet);
+	void calculate_gndspeed_undershoot(const math::Vector<2> &current_position, const math::Vector<2> &ground_speed_2d, const struct position_setpoint_triplet_s &pos_sp_triplet);
 
 	/**
 	 * Shim for calling task_main from task_create.
@@ -345,7 +356,7 @@ private:
 	/**
 	 * Main sensor collection task.
 	 */
-	void		task_main() __attribute__((noreturn));
+	void		task_main();
 
 	/*
 	 * Reset takeoff state
@@ -356,6 +367,19 @@ private:
 	 * Reset landing state
 	 */
 	void reset_landing_state();
+
+	/*
+	 * Call TECS : a wrapper function to call one of the TECS implementations (mTECS is called only if enabled via parameter)
+	 * XXX need to clean up/remove this function once mtecs fully replaces TECS
+	 */
+	void tecs_update_pitch_throttle(float alt_sp, float v_sp, float eas2tas,
+			float pitch_min_rad, float pitch_max_rad,
+			float throttle_min, float throttle_max, float throttle_cruise,
+			bool climbout_mode, float climbout_pitch_min_rad,
+			float altitude,
+			const math::Vector<3> &ground_speed,
+			tecs_mode mode = TECS_MODE_NORMAL);
+
 };
 
 namespace l1_control
@@ -384,6 +408,7 @@ FixedwingPositionControl::FixedwingPositionControl() :
 	_control_mode_sub(-1),
 	_params_sub(-1),
 	_manual_control_sub(-1),
+	_range_finder_sub(-1),
 
 /* publications */
 	_attitude_sp_pub(-1),
@@ -393,7 +418,6 @@ FixedwingPositionControl::FixedwingPositionControl() :
 	_loop_perf(perf_alloc(PC_ELAPSED, "fw l1 control")),
 
 /* states */
-	_setpoint_valid(false),
 	_loiter_hold(false),
 	land_noreturn_horizontal(false),
 	land_noreturn_vertical(false),
@@ -401,9 +425,9 @@ FixedwingPositionControl::FixedwingPositionControl() :
 	land_motor_lim(false),
 	land_onslope(false),
 	launch_detected(false),
-	last_manual(false),
 	usePreTakeoffThrust(false),
-	flare_curve_alt_last(0.0f),
+	last_manual(false),
+	flare_curve_alt_rel_last(0.0f),
 	launchDetector(),
 	_airspeed_error(0.0f),
 	_airspeed_valid(false),
@@ -417,13 +441,15 @@ FixedwingPositionControl::FixedwingPositionControl() :
 	_control_mode(),
 	_global_pos(),
 	_pos_sp_triplet(),
-	_sensor_combined()
+	_sensor_combined(),
+	_mTecs(),
+	_was_pos_control_mode(false),
+	_range_finder()
 {
 	_nav_capabilities.turn_distance = 0.0f;
 
 	_parameter_handles.l1_period = param_find("FW_L1_PERIOD");
 	_parameter_handles.l1_damping = param_find("FW_L1_DAMPING");
-	_parameter_handles.loiter_hold_radius = param_find("FW_LOITER_R");
 
 	_parameter_handles.airspeed_min = param_find("FW_AIRSPD_MIN");
 	_parameter_handles.airspeed_trim = param_find("FW_AIRSPD_TRIM");
@@ -442,6 +468,7 @@ FixedwingPositionControl::FixedwingPositionControl() :
 	_parameter_handles.land_flare_alt_relative = param_find("FW_LND_FLALT");
 	_parameter_handles.land_thrust_lim_alt_relative = param_find("FW_LND_TLALT");
 	_parameter_handles.land_heading_hold_horizontal_distance = param_find("FW_LND_HHDIST");
+	_parameter_handles.range_finder_rel_alt = param_find("FW_LND_RFRALT");
 
 	_parameter_handles.time_const = 			param_find("FW_T_TIME_CONST");
 	_parameter_handles.min_sink_rate = 			param_find("FW_T_SINK_MIN");
@@ -494,7 +521,6 @@ FixedwingPositionControl::parameters_update()
 	/* L1 control parameters */
 	param_get(_parameter_handles.l1_damping, &(_parameters.l1_damping));
 	param_get(_parameter_handles.l1_period, &(_parameters.l1_period));
-	param_get(_parameter_handles.loiter_hold_radius, &(_parameters.loiter_hold_radius));
 
 	param_get(_parameter_handles.airspeed_min, &(_parameters.airspeed_min));
 	param_get(_parameter_handles.airspeed_trim, &(_parameters.airspeed_trim));
@@ -531,27 +557,12 @@ FixedwingPositionControl::parameters_update()
 	param_get(_parameter_handles.land_thrust_lim_alt_relative, &(_parameters.land_thrust_lim_alt_relative));
 	param_get(_parameter_handles.land_heading_hold_horizontal_distance, &(_parameters.land_heading_hold_horizontal_distance));
 
+	param_get(_parameter_handles.range_finder_rel_alt, &(_parameters.range_finder_rel_alt));
+
 	_l1_control.set_l1_damping(_parameters.l1_damping);
 	_l1_control.set_l1_period(_parameters.l1_period);
 	_l1_control.set_l1_roll_limit(math::radians(_parameters.roll_limit));
 
-	_tecs.set_time_const(_parameters.time_const);
-	_tecs.set_min_sink_rate(_parameters.min_sink_rate);
-	_tecs.set_max_sink_rate(_parameters.max_sink_rate);
-	_tecs.set_throttle_damp(_parameters.throttle_damp);
-	_tecs.set_integrator_gain(_parameters.integrator_gain);
-	_tecs.set_vertical_accel_limit(_parameters.vertical_accel_limit);
-	_tecs.set_height_comp_filter_omega(_parameters.height_comp_filter_omega);
-	_tecs.set_speed_comp_filter_omega(_parameters.speed_comp_filter_omega);
-	_tecs.set_roll_throttle_compensation(_parameters.roll_throttle_compensation);
-	_tecs.set_speed_weight(_parameters.speed_weight);
-	_tecs.set_pitch_damping(_parameters.pitch_damping);
-	_tecs.set_indicated_airspeed_min(_parameters.airspeed_min);
-	_tecs.set_indicated_airspeed_max(_parameters.airspeed_max);
-	_tecs.set_max_climb_rate(_parameters.max_climb_rate);
-	_tecs.set_heightrate_p(_parameters.heightrate_p);
-	_tecs.set_speedrate_p(_parameters.speedrate_p);
-
 	/* sanity check parameters */
 	if (_parameters.airspeed_max < _parameters.airspeed_min ||
 	    _parameters.airspeed_max < 5.0f ||
@@ -574,6 +585,9 @@ FixedwingPositionControl::parameters_update()
 	/* Update Launch Detector Parameters */
 	launchDetector.updateParams();
 
+	/* Update the mTecs */
+	_mTecs.updateParams();
+
 	return OK;
 }
 
@@ -620,12 +634,23 @@ FixedwingPositionControl::vehicle_airspeed_poll()
 		}
 	}
 
-	/* update TECS state */
-	_tecs.enable_airspeed(_airspeed_valid);
-
 	return airspeed_updated;
 }
 
+bool
+FixedwingPositionControl::range_finder_poll()
+{
+	/* check if there is a range finder measurement */
+	bool range_finder_updated;
+	orb_check(_range_finder_sub, &range_finder_updated);
+
+	if (range_finder_updated) {
+		orb_copy(ORB_ID(sensor_range_finder), _range_finder_sub, &_range_finder);
+	}
+
+	return range_finder_updated;
+}
+
 void
 FixedwingPositionControl::vehicle_attitude_poll()
 {
@@ -663,7 +688,6 @@ FixedwingPositionControl::vehicle_setpoint_poll()
 
 	if (pos_sp_triplet_updated) {
 		orb_copy(ORB_ID(position_setpoint_triplet), _pos_sp_triplet_sub, &_pos_sp_triplet);
-		_setpoint_valid = true;
 	}
 }
 
@@ -705,15 +729,15 @@ FixedwingPositionControl::calculate_target_airspeed(float airspeed_demand)
 }
 
 void
-FixedwingPositionControl::calculate_gndspeed_undershoot(const math::Vector<2> &current_position, const math::Vector<2> &ground_speed, const struct position_setpoint_triplet_s &pos_sp_triplet)
+FixedwingPositionControl::calculate_gndspeed_undershoot(const math::Vector<2> &current_position, const math::Vector<2> &ground_speed_2d, const struct position_setpoint_triplet_s &pos_sp_triplet)
 {
 
-	if (_global_pos_valid && !(pos_sp_triplet.current.type == SETPOINT_TYPE_LOITER)) {
+	if (pos_sp_triplet.current.valid && !(pos_sp_triplet.current.type == SETPOINT_TYPE_LOITER)) {
 
 		/* rotate ground speed vector with current attitude */
 		math::Vector<2> yaw_vector(_R_nb(0, 0), _R_nb(1, 0));
 		yaw_vector.normalize();
-		float ground_speed_body = yaw_vector * ground_speed;
+		float ground_speed_body = yaw_vector * ground_speed_2d;
 
 		/* The minimum desired ground speed is the minimum airspeed projected on to the ground using the altitude and horizontal difference between the waypoints if available*/
 		float distance = 0.0f;
@@ -754,13 +778,31 @@ void FixedwingPositionControl::navigation_capabilities_publish()
 	}
 }
 
+float FixedwingPositionControl::get_relative_landingalt(float land_setpoint_alt, float current_alt, const struct range_finder_report &range_finder, float range_finder_use_relative_alt)
+{
+	float rel_alt_estimated = current_alt - land_setpoint_alt;
+
+	/* only use range finder if:
+	 * parameter (range_finder_use_relative_alt) > 0
+	 * the measurement is valid
+	 * the estimated relative altitude (from global altitude estimate and landing waypoint) <= range_finder_use_relative_alt
+	 */
+	if (range_finder_use_relative_alt < 0 || !range_finder.valid || rel_alt_estimated > range_finder_use_relative_alt ) {
+		return rel_alt_estimated;
+	}
+
+	return range_finder.distance;
+
+}
+
 bool
-FixedwingPositionControl::control_position(const math::Vector<2> &current_position, const math::Vector<2> &ground_speed,
+FixedwingPositionControl::control_position(const math::Vector<2> &current_position, const math::Vector<3> &ground_speed,
 		const struct position_setpoint_triplet_s &pos_sp_triplet)
 {
 	bool setpoint = true;
 
-	calculate_gndspeed_undershoot(current_position, ground_speed, pos_sp_triplet);
+	math::Vector<2> ground_speed_2d = {ground_speed(0), ground_speed(1)};
+	calculate_gndspeed_undershoot(current_position, ground_speed_2d, pos_sp_triplet);
 
 	float eas2tas = 1.0f; // XXX calculate actual number based on current measurements
 
@@ -771,7 +813,6 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 	math::Vector<3> accel_body(_sensor_combined.accelerometer_m_s2);
 	math::Vector<3> accel_earth = _R_nb * accel_body;
 
-	_tecs.update_50hz(baro_altitude, _airspeed.indicated_airspeed_m_s, _R_nb, accel_body, accel_earth);
 	float altitude_error = _pos_sp_triplet.current.alt - _global_pos.alt;
 
 	/* no throttle limit as default */
@@ -781,20 +822,31 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 
 	// XXX this should only execute if auto AND safety off (actuators active),
 	// else integrators should be constantly reset.
-	if (_control_mode.flag_control_position_enabled) {
+	if (pos_sp_triplet.current.valid) {
+
+		if (!_was_pos_control_mode) {
+			/* reset integrators */
+			if (_mTecs.getEnabled()) {
+				_mTecs.resetIntegrators();
+				_mTecs.resetDerivatives(_airspeed.true_airspeed_m_s);
+			}
+		}
+
+		_was_pos_control_mode = true;
 
 		/* get circle mode */
 		bool was_circle_mode = _l1_control.circle_mode();
 
-		/* restore speed weight, in case changed intermittently (e.g. in landing handling) */
-		_tecs.set_speed_weight(_parameters.speed_weight);
-
 		/* current waypoint (the one currently heading for) */
 		math::Vector<2> next_wp((float)pos_sp_triplet.current.lat, (float)pos_sp_triplet.current.lon);
 
 		/* current waypoint (the one currently heading for) */
 		math::Vector<2> curr_wp((float)pos_sp_triplet.current.lat, (float)pos_sp_triplet.current.lon);
 
+		/* Initialize attitude controller integrator reset flags to 0 */
+		_att_sp.roll_reset_integral = false;
+		_att_sp.pitch_reset_integral = false;
+		_att_sp.yaw_reset_integral = false;
 
 		/* previous waypoint */
 		math::Vector<2> prev_wp;
@@ -813,31 +865,29 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 
 		}
 
-		if (pos_sp_triplet.current.type == SETPOINT_TYPE_NORMAL) {
+		if (pos_sp_triplet.current.type == SETPOINT_TYPE_POSITION) {
 			/* waypoint is a plain navigation waypoint */
-			_l1_control.navigate_waypoints(prev_wp, curr_wp, current_position, ground_speed);
+			_l1_control.navigate_waypoints(prev_wp, curr_wp, current_position, ground_speed_2d);
 			_att_sp.roll_body = _l1_control.nav_roll();
 			_att_sp.yaw_body = _l1_control.nav_bearing();
 
-			_tecs.update_pitch_throttle(_R_nb, _att.pitch, _global_pos.alt, _pos_sp_triplet.current.alt, calculate_target_airspeed(_parameters.airspeed_trim),
-						    _airspeed.indicated_airspeed_m_s, eas2tas,
-						    false, math::radians(_parameters.pitch_limit_min),
-						    _parameters.throttle_min, _parameters.throttle_max, _parameters.throttle_cruise,
-						    math::radians(_parameters.pitch_limit_min), math::radians(_parameters.pitch_limit_max));
+			tecs_update_pitch_throttle(_pos_sp_triplet.current.alt, calculate_target_airspeed(_parameters.airspeed_trim), eas2tas,
+						math::radians(_parameters.pitch_limit_min), math::radians(_parameters.pitch_limit_max),
+						_parameters.throttle_min, _parameters.throttle_max, _parameters.throttle_cruise,
+						false, math::radians(_parameters.pitch_limit_min), _global_pos.alt, ground_speed);
 
 		} else if (pos_sp_triplet.current.type == SETPOINT_TYPE_LOITER) {
 
 			/* waypoint is a loiter waypoint */
 			_l1_control.navigate_loiter(curr_wp, current_position, pos_sp_triplet.current.loiter_radius,
-						  pos_sp_triplet.current.loiter_direction, ground_speed);
+						  pos_sp_triplet.current.loiter_direction, ground_speed_2d);
 			_att_sp.roll_body = _l1_control.nav_roll();
 			_att_sp.yaw_body = _l1_control.nav_bearing();
 
-			_tecs.update_pitch_throttle(_R_nb, _att.pitch, _global_pos.alt, _pos_sp_triplet.current.alt, calculate_target_airspeed(_parameters.airspeed_trim),
-						    _airspeed.indicated_airspeed_m_s, eas2tas,
-						    false, math::radians(_parameters.pitch_limit_min),
-						    _parameters.throttle_min, _parameters.throttle_max, _parameters.throttle_cruise,
-						    math::radians(_parameters.pitch_limit_min), math::radians(_parameters.pitch_limit_max));
+			tecs_update_pitch_throttle(_pos_sp_triplet.current.alt, calculate_target_airspeed(_parameters.airspeed_trim), eas2tas,
+						math::radians(_parameters.pitch_limit_min), math::radians(_parameters.pitch_limit_max),
+						_parameters.throttle_min, _parameters.throttle_max, _parameters.throttle_cruise,
+						false, math::radians(_parameters.pitch_limit_min), _global_pos.alt, ground_speed);
 
 		} else if (pos_sp_triplet.current.type == SETPOINT_TYPE_LAND) {
 
@@ -862,7 +912,7 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 
 //					warnx("NORET: %d, target_bearing: %d, yaw: %d", (int)land_noreturn_horizontal, (int)math::degrees(target_bearing), (int)math::degrees(_att.yaw));
 
-				_l1_control.navigate_heading(target_bearing, _att.yaw, ground_speed);
+				_l1_control.navigate_heading(target_bearing, _att.yaw, ground_speed_2d);
 
 				/* limit roll motion to prevent wings from touching the ground first */
 				_att_sp.roll_body = math::constrain(_att_sp.roll_body, math::radians(-10.0f), math::radians(10.0f));
@@ -872,7 +922,7 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 			} else {
 
 				/* normal navigation */
-				_l1_control.navigate_waypoints(prev_wp, curr_wp, current_position, ground_speed);
+				_l1_control.navigate_waypoints(prev_wp, curr_wp, current_position, ground_speed_2d);
 			}
 
 			_att_sp.roll_body = _l1_control.nav_roll();
@@ -896,12 +946,14 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 
 			/* Calculate distance (to landing waypoint) and altitude of last ordinary waypoint L */
 			float L_wp_distance = get_distance_to_next_waypoint(prev_wp(0), prev_wp(1), curr_wp(0), curr_wp(1));
-			float L_altitude = landingslope.getLandingSlopeAbsoluteAltitude(L_wp_distance, _pos_sp_triplet.current.alt);
+			float L_altitude_rel = _pos_sp_triplet.previous.valid ? _pos_sp_triplet.previous.alt - _pos_sp_triplet.current.alt : 0.0f;
 
 			float bearing_airplane_currwp = get_bearing_to_next_waypoint(current_position(0), current_position(1), curr_wp(0), curr_wp(1));
-			float landing_slope_alt_desired = landingslope.getLandingSlopeAbsoluteAltitudeSave(wp_distance, bearing_lastwp_currwp, bearing_airplane_currwp, _pos_sp_triplet.current.alt);
+			float landing_slope_alt_rel_desired = landingslope.getLandingSlopeRelativeAltitudeSave(wp_distance, bearing_lastwp_currwp, bearing_airplane_currwp);
 
-			if ( (_global_pos.alt < _pos_sp_triplet.current.alt + landingslope.flare_relative_alt()) || land_noreturn_vertical) {  //checking for land_noreturn to avoid unwanted climb out
+			float relative_alt = get_relative_landingalt(_pos_sp_triplet.current.alt, _global_pos.alt, _range_finder, _parameters.range_finder_rel_alt);
+
+			if ( (relative_alt < landingslope.flare_relative_alt()) || land_noreturn_vertical) {  //checking for land_noreturn to avoid unwanted climb out
 
 				/* land with minimal speed */
 
@@ -911,7 +963,7 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 				/* kill the throttle if param requests it */
 				throttle_max = _parameters.throttle_max;
 
-				 if (_global_pos.alt < _pos_sp_triplet.current.alt + landingslope.motor_lim_relative_alt() || land_motor_lim) {
+				 if (relative_alt < landingslope.motor_lim_relative_alt() || land_motor_lim) {
 					throttle_max = math::min(throttle_max, _parameters.throttle_land_max);
 					if (!land_motor_lim) {
 						land_motor_lim  = true;
@@ -920,20 +972,22 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 
 				 }
 
-				float flare_curve_alt = landingslope.getFlareCurveAltitudeSave(wp_distance, bearing_lastwp_currwp, bearing_airplane_currwp, _pos_sp_triplet.current.alt);
+				float flare_curve_alt_rel = landingslope.getFlareCurveRelativeAltitudeSave(wp_distance, bearing_lastwp_currwp, bearing_airplane_currwp);
 
 				/* avoid climbout */
-				if ((flare_curve_alt_last < flare_curve_alt && land_noreturn_vertical) || land_stayonground)
+				if ((flare_curve_alt_rel_last < flare_curve_alt_rel && land_noreturn_vertical) || land_stayonground)
 				{
-					flare_curve_alt = pos_sp_triplet.current.alt;
+					flare_curve_alt_rel = 0.0f; // stay on ground
 					land_stayonground = true;
 				}
 
-				_tecs.update_pitch_throttle(_R_nb, _att.pitch, _global_pos.alt, flare_curve_alt, calculate_target_airspeed(airspeed_land),
-												    _airspeed.indicated_airspeed_m_s, eas2tas,
-												    false, flare_pitch_angle_rad,
-												    0.0f, throttle_max, throttle_land,
-												    flare_pitch_angle_rad,  math::radians(15.0f));
+				tecs_update_pitch_throttle(_pos_sp_triplet.current.alt + flare_curve_alt_rel,
+						calculate_target_airspeed(airspeed_land), eas2tas,
+						flare_pitch_angle_rad, math::radians(15.0f),
+						0.0f, throttle_max, throttle_land,
+						false, flare_pitch_angle_rad,
+						_pos_sp_triplet.current.alt + relative_alt, ground_speed,
+						land_motor_lim ? TECS_MODE_LAND_THROTTLELIM : TECS_MODE_LAND);
 
 				if (!land_noreturn_vertical) {
 					mavlink_log_info(_mavlink_fd, "#audio: Landing, flaring");
@@ -941,46 +995,62 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 				}
 				//warnx("Landing:  flare, _global_pos.alt  %.1f, flare_curve_alt %.1f, flare_curve_alt_last %.1f, flare_length %.1f, wp_distance %.1f", _global_pos.alt, flare_curve_alt, flare_curve_alt_last, flare_length, wp_distance);
 
-				flare_curve_alt_last = flare_curve_alt;
+				flare_curve_alt_rel_last = flare_curve_alt_rel;
 			} else {
 
 				 /* intersect glide slope:
 				  * minimize speed to approach speed
-				  * if current position is higher or within 10m of slope follow the glide slope
-				  * if current position is below slope -10m continue on maximum of previous wp altitude or L_altitude until the intersection with the slope
+				  * if current position is higher than the slope follow the glide slope (sink to the
+				  * glide slope)
+				  * also if the system captures the slope it should stay
+				  * on the slope (bool land_onslope)
+				  * if current position is below the slope continue at previous wp altitude
+				  * until the intersection with slope
 				  * */
-				float altitude_desired = _global_pos.alt;
-				if (_global_pos.alt > landing_slope_alt_desired - 10.0f) {
+				float altitude_desired_rel = relative_alt;
+				if (relative_alt > landing_slope_alt_rel_desired || land_onslope) {
 					/* stay on slope */
-					altitude_desired = landing_slope_alt_desired;
+					altitude_desired_rel = landing_slope_alt_rel_desired;
 					if (!land_onslope) {
 						mavlink_log_info(_mavlink_fd, "#audio: Landing, on slope");
 						land_onslope = true;
 					}
 				} else {
 					/* continue horizontally */
-					altitude_desired =  math::max(_global_pos.alt, L_altitude);
+					altitude_desired_rel =  _pos_sp_triplet.previous.valid ? L_altitude_rel : relative_alt;
 				}
 
-				_tecs.update_pitch_throttle(_R_nb, _att.pitch, _global_pos.alt, altitude_desired, calculate_target_airspeed(airspeed_approach),
-							    _airspeed.indicated_airspeed_m_s, eas2tas,
-							    false, math::radians(_parameters.pitch_limit_min),
-							    _parameters.throttle_min, _parameters.throttle_max, _parameters.throttle_cruise,
-							    math::radians(_parameters.pitch_limit_min), math::radians(_parameters.pitch_limit_max));
+				tecs_update_pitch_throttle(_pos_sp_triplet.current.alt + altitude_desired_rel,
+						calculate_target_airspeed(airspeed_approach), eas2tas,
+						math::radians(_parameters.pitch_limit_min),
+						math::radians(_parameters.pitch_limit_max),
+						_parameters.throttle_min,
+						_parameters.throttle_max,
+						_parameters.throttle_cruise,
+						false,
+						math::radians(_parameters.pitch_limit_min),
+						_pos_sp_triplet.current.alt + relative_alt,
+						ground_speed);
 			}
 
 		} else if (pos_sp_triplet.current.type == SETPOINT_TYPE_TAKEOFF) {
 
 			/* Perform launch detection */
-//			warnx("Launch detection running");
 			if(!launch_detected) { //do not do further checks once a launch was detected
 				if (launchDetector.launchDetectionEnabled()) {
 					static hrt_abstime last_sent = 0;
 					if(hrt_absolute_time() - last_sent > 4e6) {
-//						warnx("Launch detection running");
 						mavlink_log_info(_mavlink_fd, "#audio: Launchdetection running");
 						last_sent = hrt_absolute_time();
 					}
+
+					/* Tell the attitude controller to stop integrating while we are waiting
+					 * for the launch */
+					_att_sp.roll_reset_integral = true;
+					_att_sp.pitch_reset_integral = true;
+					_att_sp.yaw_reset_integral = true;
+
+					/* Detect launch */
 					launchDetector.update(_sensor_combined.accelerometer_m_s2[0]);
 					if (launchDetector.getLaunchDetected()) {
 						launch_detected = true;
@@ -993,7 +1063,7 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 				}
 			}
 
-			_l1_control.navigate_waypoints(prev_wp, curr_wp, current_position, ground_speed);
+			_l1_control.navigate_waypoints(prev_wp, curr_wp, current_position, ground_speed_2d);
 			_att_sp.roll_body = _l1_control.nav_roll();
 			_att_sp.yaw_body = _l1_control.nav_bearing();
 
@@ -1004,22 +1074,36 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 				if (altitude_error > 15.0f) {
 
 					/* enforce a minimum of 10 degrees pitch up on takeoff, or take parameter */
-					_tecs.update_pitch_throttle(_R_nb, _att.pitch, _global_pos.alt, _pos_sp_triplet.current.alt, calculate_target_airspeed(1.3f * _parameters.airspeed_min),
-									_airspeed.indicated_airspeed_m_s, eas2tas,
-									true, math::max(math::radians(pos_sp_triplet.current.pitch_min), math::radians(10.0f)),
-									_parameters.throttle_min, _parameters.throttle_max, _parameters.throttle_cruise,
-									math::radians(_parameters.pitch_limit_min), math::radians(_parameters.pitch_limit_max));
+					tecs_update_pitch_throttle(_pos_sp_triplet.current.alt,
+							calculate_target_airspeed(1.3f * _parameters.airspeed_min),
+							eas2tas,
+							math::radians(_parameters.pitch_limit_min),
+							math::radians(_parameters.pitch_limit_max),
+							_parameters.throttle_min, _parameters.throttle_max,
+							_parameters.throttle_cruise,
+							true,
+							math::max(math::radians(pos_sp_triplet.current.pitch_min),
+							math::radians(10.0f)),
+							_global_pos.alt,
+							ground_speed,
+							TECS_MODE_TAKEOFF);
 
 					/* limit roll motion to ensure enough lift */
 					_att_sp.roll_body = math::constrain(_att_sp.roll_body, math::radians(-15.0f), math::radians(15.0f));
 
 				} else {
-
-					_tecs.update_pitch_throttle(_R_nb, _att.pitch, _global_pos.alt, _pos_sp_triplet.current.alt, calculate_target_airspeed(_parameters.airspeed_trim),
-									_airspeed.indicated_airspeed_m_s, eas2tas,
-									false, math::radians(_parameters.pitch_limit_min),
-									_parameters.throttle_min, _parameters.throttle_max, _parameters.throttle_cruise,
-									math::radians(_parameters.pitch_limit_min), math::radians(_parameters.pitch_limit_max));
+					tecs_update_pitch_throttle(_pos_sp_triplet.current.alt,
+							calculate_target_airspeed(_parameters.airspeed_trim),
+							eas2tas,
+								math::radians(_parameters.pitch_limit_min),
+								math::radians(_parameters.pitch_limit_max),
+								_parameters.throttle_min,
+								_parameters.throttle_max,
+								_parameters.throttle_cruise,
+								false,
+								math::radians(_parameters.pitch_limit_min),
+								_global_pos.alt,
+								ground_speed);
 				}
 
 			} else {
@@ -1051,21 +1135,23 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 			_att_sp.roll_reset_integral = true;
 		}
 
-	} else if (0/* easy mode enabled */) {
+	} else if (0/* posctrl mode enabled */) {
 
-		/** EASY FLIGHT **/
+		_was_pos_control_mode = false;
 
-		if (0/* switched from another mode to easy */) {
-			_seatbelt_hold_heading = _att.yaw;
-		}
+		/** POSCTRL FLIGHT **/
 
-		if (0/* easy on and manual control yaw non-zero */) {
-			_seatbelt_hold_heading = _att.yaw + _manual.yaw;
-		}
+	if (0/* switched from another mode to posctrl */) {
+		_altctrl_hold_heading = _att.yaw;
+	}
+
+	if (0/* posctrl on and manual control yaw non-zero */) {
+		_altctrl_hold_heading = _att.yaw + _manual.r;
+	}
 
-		//XXX not used
+	//XXX not used
 
-		/* climb out control */
+	/* climb out control */
 //		bool climb_out = false;
 //
 //		/* user wants to climb out */
@@ -1073,69 +1159,69 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 //			climb_out = true;
 //		}
 
-		/* if in seatbelt mode, set airspeed based on manual control */
+	/* if in altctrl mode, set airspeed based on manual control */
 
-		// XXX check if ground speed undershoot should be applied here
-		float seatbelt_airspeed = _parameters.airspeed_min +
-					  (_parameters.airspeed_max - _parameters.airspeed_min) *
-					  _manual.throttle;
+	// XXX check if ground speed undershoot should be applied here
+	float altctrl_airspeed = _parameters.airspeed_min +
+					(_parameters.airspeed_max - _parameters.airspeed_min) *
+					_manual.z;
 
-		_l1_control.navigate_heading(_seatbelt_hold_heading, _att.yaw, ground_speed);
+		_l1_control.navigate_heading(_altctrl_hold_heading, _att.yaw, ground_speed_2d);
 		_att_sp.roll_body = _l1_control.nav_roll();
 		_att_sp.yaw_body = _l1_control.nav_bearing();
-		_tecs.update_pitch_throttle(_R_nb, _att.pitch, _global_pos.alt, _global_pos.alt + _manual.pitch * 2.0f,
-					    seatbelt_airspeed,
-					    _airspeed.indicated_airspeed_m_s, eas2tas,
-					    false, _parameters.pitch_limit_min,
-					    _parameters.throttle_min, _parameters.throttle_max, _parameters.throttle_cruise,
-					    _parameters.pitch_limit_min, _parameters.pitch_limit_max);
 
-	} else if (0/* seatbelt mode enabled */) {
+		tecs_update_pitch_throttle(_global_pos.alt + _manual.x * 2.0f, altctrl_airspeed, eas2tas,
+					math::radians(_parameters.pitch_limit_min), math::radians(_parameters.pitch_limit_max),
+					_parameters.throttle_min, _parameters.throttle_max, _parameters.throttle_cruise,
+					false, math::radians(_parameters.pitch_limit_min), _global_pos.alt, ground_speed);
+
+	} else if (0/* altctrl mode enabled */) {
+
+		_was_pos_control_mode = false;
 
-		/** SEATBELT FLIGHT **/
+		/** ALTCTRL FLIGHT **/
 
-		if (0/* switched from another mode to seatbelt */) {
-			_seatbelt_hold_heading = _att.yaw;
+		if (0/* switched from another mode to altctrl */) {
+			_altctrl_hold_heading = _att.yaw;
 		}
 
-		if (0/* seatbelt on and manual control yaw non-zero */) {
-			_seatbelt_hold_heading = _att.yaw + _manual.yaw;
+		if (0/* altctrl on and manual control yaw non-zero */) {
+			_altctrl_hold_heading = _att.yaw + _manual.r;
 		}
 
-		/* if in seatbelt mode, set airspeed based on manual control */
+		/* if in altctrl mode, set airspeed based on manual control */
 
 		// XXX check if ground speed undershoot should be applied here
-		float seatbelt_airspeed = _parameters.airspeed_min +
+		float altctrl_airspeed = _parameters.airspeed_min +
 					  (_parameters.airspeed_max - _parameters.airspeed_min) *
-					  _manual.throttle;
+					  _manual.z;
 
 		/* user switched off throttle */
-		if (_manual.throttle < 0.1f) {
+		if (_manual.z < 0.1f) {
 			throttle_max = 0.0f;
-			/* switch to pure pitch based altitude control, give up speed */
-			_tecs.set_speed_weight(0.0f);
 		}
 
 		/* climb out control */
 		bool climb_out = false;
 
 		/* user wants to climb out */
-		if (_manual.pitch > 0.3f && _manual.throttle > 0.8f) {
+		if (_manual.x > 0.3f && _manual.z > 0.8f) {
 			climb_out = true;
 		}
 
-		_l1_control.navigate_heading(_seatbelt_hold_heading, _att.yaw, ground_speed);
-		_att_sp.roll_body =	_manual.roll;
-		_att_sp.yaw_body =	_manual.yaw;
-		_tecs.update_pitch_throttle(_R_nb, _att.pitch, _global_pos.alt, _global_pos.alt + _manual.pitch * 2.0f,
-					    seatbelt_airspeed,
-					    _airspeed.indicated_airspeed_m_s, eas2tas,
-					    climb_out, _parameters.pitch_limit_min,
-					    _parameters.throttle_min, _parameters.throttle_max, _parameters.throttle_cruise,
-					    _parameters.pitch_limit_min, _parameters.pitch_limit_max);
+		_l1_control.navigate_heading(_altctrl_hold_heading, _att.yaw, ground_speed_2d);
+		_att_sp.roll_body =	_manual.y;
+		_att_sp.yaw_body =	_manual.r;
+		tecs_update_pitch_throttle(_global_pos.alt + _manual.x * 2.0f, altctrl_airspeed, eas2tas,
+					math::radians(_parameters.pitch_limit_min), math::radians(_parameters.pitch_limit_max),
+					_parameters.throttle_min, _parameters.throttle_max, _parameters.throttle_cruise,
+					climb_out, math::radians(_parameters.pitch_limit_min),
+					_global_pos.alt, ground_speed);
 
 	} else {
 
+		_was_pos_control_mode = false;
+
 		/** MANUAL FLIGHT **/
 
 		/* no flight mode applies, do not publish an attitude setpoint */
@@ -1152,9 +1238,9 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 		_att_sp.thrust = launchDetector.getThrottlePreTakeoff();
 	}
 	else {
-		_att_sp.thrust = math::min(_tecs.get_throttle_demand(), throttle_max);
+		_att_sp.thrust = math::min(_mTecs.getThrottleSetpoint(), throttle_max);
 	}
-	_att_sp.pitch_body = _tecs.get_pitch_demand();
+	_att_sp.pitch_body = _mTecs.getPitchSetpoint();
 
 	if (_control_mode.flag_control_position_enabled) {
 		last_manual = false;
@@ -1185,6 +1271,7 @@ FixedwingPositionControl::task_main()
 	_airspeed_sub = orb_subscribe(ORB_ID(airspeed));
 	_params_sub = orb_subscribe(ORB_ID(parameter_update));
 	_manual_control_sub = orb_subscribe(ORB_ID(manual_control_setpoint));
+	_range_finder_sub = orb_subscribe(ORB_ID(sensor_range_finder));
 
 	/* rate limit vehicle status updates to 5Hz */
 	orb_set_interval(_control_mode_sub, 200);
@@ -1264,9 +1351,10 @@ FixedwingPositionControl::task_main()
 			vehicle_setpoint_poll();
 			vehicle_sensor_combined_poll();
 			vehicle_airspeed_poll();
+			range_finder_poll();
 			// vehicle_baro_poll();
 
-			math::Vector<2> ground_speed(_global_pos.vel_n, _global_pos.vel_e);
+			math::Vector<3> ground_speed(_global_pos.vel_n, _global_pos.vel_e,  _global_pos.vel_d);
 			math::Vector<2> current_position((float)_global_pos.lat, (float)_global_pos.lon);
 
 			/*
@@ -1328,6 +1416,30 @@ void FixedwingPositionControl::reset_landing_state()
 	land_onslope = false;
 }
 
+void FixedwingPositionControl::tecs_update_pitch_throttle(float alt_sp, float v_sp, float eas2tas,
+		float pitch_min_rad, float pitch_max_rad,
+		float throttle_min, float throttle_max, float throttle_cruise,
+		bool climbout_mode, float climbout_pitch_min_rad,
+		float altitude,
+		const math::Vector<3> &ground_speed,
+		tecs_mode mode)
+{
+	/* Using mtecs library: prepare arguments for mtecs call */
+	float flightPathAngle = 0.0f;
+	float ground_speed_length = ground_speed.length();
+	if (ground_speed_length > FLT_EPSILON) {
+		flightPathAngle = -asinf(ground_speed(2)/ground_speed_length);
+	}
+	fwPosctrl::LimitOverride limitOverride;
+	if (climbout_mode) {
+		limitOverride.enablePitchMinOverride(M_RAD_TO_DEG_F * climbout_pitch_min_rad);
+	} else {
+		limitOverride.disablePitchMinOverride();
+	}
+	_mTecs.updateAltitudeSpeed(flightPathAngle, altitude, alt_sp, _airspeed.true_airspeed_m_s, v_sp, mode,
+			limitOverride);
+}
+
 int
 FixedwingPositionControl::start()
 {
diff --git a/src/modules/fw_pos_control_l1/fw_pos_control_l1_params.c b/src/modules/fw_pos_control_l1/fw_pos_control_l1_params.c
index 37f06dbe5..52128e1b7 100644
--- a/src/modules/fw_pos_control_l1/fw_pos_control_l1_params.c
+++ b/src/modules/fw_pos_control_l1/fw_pos_control_l1_params.c
@@ -72,17 +72,6 @@ PARAM_DEFINE_FLOAT(FW_L1_PERIOD, 25.0f);
 PARAM_DEFINE_FLOAT(FW_L1_DAMPING, 0.75f);
 
 /**
- * Default Loiter Radius
- *
- * This radius is used when no other loiter radius is set.
- *
- * @min 10.0
- * @max 100.0
- * @group L1 Control
- */
-PARAM_DEFINE_FLOAT(FW_LOITER_R, 50.0f);
-
-/**
  * Cruise throttle
  *
  * This is the throttle setting required to achieve the desired cruise speed. Most airframes have a value of 0.5-0.7.
@@ -375,3 +364,14 @@ PARAM_DEFINE_FLOAT(FW_LND_TLALT, 5.0f);
  * @group L1 Control
  */
 PARAM_DEFINE_FLOAT(FW_LND_HHDIST, 15.0f);
+
+/**
+ * Relative altitude threshold for range finder measurements for use during landing
+ *
+ * range finder measurements will only be used if the estimated relative altitude (gobal_pos.alt - landing_waypoint.alt) is < FW_LND_RFRALT
+ * set to < 0 to disable
+ * the correct value of this parameter depends on your range measuring device as well as on the terrain at the landing location
+ *
+ * @group L1 Control
+ */
+PARAM_DEFINE_FLOAT(FW_LND_RFRALT, -1.0f);
diff --git a/src/modules/fw_pos_control_l1/landingslope.cpp b/src/modules/fw_pos_control_l1/landingslope.cpp
index e5f7023ae..42e00da05 100644
--- a/src/modules/fw_pos_control_l1/landingslope.cpp
+++ b/src/modules/fw_pos_control_l1/landingslope.cpp
@@ -46,16 +46,16 @@
 #include <unistd.h>
 #include <mathlib/mathlib.h>
 
-void Landingslope::update(float landing_slope_angle_rad,
-		float flare_relative_alt,
-		float motor_lim_relative_alt,
-		float H1_virt)
+void Landingslope::update(float landing_slope_angle_rad_new,
+		float flare_relative_alt_new,
+		float motor_lim_relative_alt_new,
+		float H1_virt_new)
 {
 
-	_landing_slope_angle_rad = landing_slope_angle_rad;
-	_flare_relative_alt = flare_relative_alt;
-	_motor_lim_relative_alt = motor_lim_relative_alt;
-	_H1_virt = H1_virt;
+	_landing_slope_angle_rad = landing_slope_angle_rad_new;
+	_flare_relative_alt = flare_relative_alt_new;
+	_motor_lim_relative_alt = motor_lim_relative_alt_new;
+	_H1_virt = H1_virt_new;
 
 	calculateSlopeValues();
 }
@@ -69,26 +69,46 @@ void Landingslope::calculateSlopeValues()
 	_horizontal_slope_displacement = (_flare_length - _d1);
 }
 
-float Landingslope::getLandingSlopeAbsoluteAltitude(float wp_distance, float wp_altitude)
+float  Landingslope::getLandingSlopeRelativeAltitude(float wp_landing_distance)
 {
-	return Landingslope::getLandingSlopeAbsoluteAltitude(wp_distance, wp_altitude, _horizontal_slope_displacement, _landing_slope_angle_rad);
+	return Landingslope::getLandingSlopeRelativeAltitude(wp_landing_distance, _horizontal_slope_displacement, _landing_slope_angle_rad);
 }
 
-float Landingslope::getLandingSlopeAbsoluteAltitudeSave(float wp_distance, float bearing_lastwp_currwp, float bearing_airplane_currwp, float wp_altitude)
+float Landingslope::getLandingSlopeRelativeAltitudeSave(float wp_landing_distance, float bearing_lastwp_currwp, float bearing_airplane_currwp)
 {
 	/* If airplane is in front of waypoint return slope altitude, else return waypoint altitude */
 	if (fabsf(bearing_airplane_currwp - bearing_lastwp_currwp) < math::radians(90.0f))
-		return getLandingSlopeAbsoluteAltitude(wp_distance, wp_altitude);
+		return getLandingSlopeRelativeAltitude(wp_landing_distance);
+	else
+		return 0.0f;
+}
+
+float Landingslope::getLandingSlopeAbsoluteAltitude(float wp_landing_distance, float wp_altitude)
+{
+	return Landingslope::getLandingSlopeAbsoluteAltitude(wp_landing_distance, wp_altitude, _horizontal_slope_displacement, _landing_slope_angle_rad);
+}
+
+float Landingslope::getLandingSlopeAbsoluteAltitudeSave(float wp_landing_distance, float bearing_lastwp_currwp, float bearing_airplane_currwp, float wp_altitude)
+{
+	/* If airplane is in front of waypoint return slope altitude, else return waypoint altitude */
+	if (fabsf(bearing_airplane_currwp - bearing_lastwp_currwp) < math::radians(90.0f))
+		return getLandingSlopeAbsoluteAltitude(wp_landing_distance, wp_altitude);
 	else
 		return wp_altitude;
 }
 
-float Landingslope::getFlareCurveAltitudeSave(float wp_landing_distance, float bearing_lastwp_currwp, float bearing_airplane_currwp, float wp_landing_altitude)
+float Landingslope::getFlareCurveRelativeAltitudeSave(float wp_landing_distance, float bearing_lastwp_currwp, float bearing_airplane_currwp)
 {
 	/* If airplane is in front of waypoint return flare curve altitude, else return waypoint altitude */
 	if (fabsf(bearing_airplane_currwp - bearing_lastwp_currwp) < math::radians(90.0f))
-		return wp_landing_altitude + _H0 * expf(-math::max(0.0f, _flare_length - wp_landing_distance)/_flare_constant) - _H1_virt;
+		return _H0 * expf(-math::max(0.0f, _flare_length - wp_landing_distance)/_flare_constant) - _H1_virt;
 	else
-		return wp_landing_altitude;
+		return 0.0f;
+}
+
+float Landingslope::getFlareCurveAbsoluteAltitudeSave(float wp_landing_distance, float bearing_lastwp_currwp, float bearing_airplane_currwp, float wp_landing_altitude)
+{
+
+	return wp_landing_altitude + getFlareCurveRelativeAltitudeSave(wp_landing_distance, bearing_lastwp_currwp, bearing_airplane_currwp);
 }
 
diff --git a/src/modules/fw_pos_control_l1/landingslope.h b/src/modules/fw_pos_control_l1/landingslope.h
index 76d65a55f..a5975ad43 100644
--- a/src/modules/fw_pos_control_l1/landingslope.h
+++ b/src/modules/fw_pos_control_l1/landingslope.h
@@ -63,11 +63,26 @@ public:
 	Landingslope() {}
 	~Landingslope() {}
 
+
+	/**
+	 *
+	 * @return relative altitude of point on landing slope at distance to landing waypoint=wp_landing_distance
+	 */
+	float getLandingSlopeRelativeAltitude(float wp_landing_distance);
+
+	/**
+	 *
+	 * @return relative altitude of point on landing slope at distance to landing waypoint=wp_landing_distance
+	 * Performs check if aircraft is in front of waypoint to avoid climbout
+	 */
+	float getLandingSlopeRelativeAltitudeSave(float wp_landing_distance, float bearing_lastwp_currwp, float bearing_airplane_currwp);
+
+
 	/**
 	 *
 	 * @return Absolute altitude of point on landing slope at distance to landing waypoint=wp_landing_distance
 	 */
-	float getLandingSlopeAbsoluteAltitude(float wp_distance, float wp_altitude);
+	float getLandingSlopeAbsoluteAltitude(float wp_landing_distance, float wp_altitude);
 
 	/**
 	 *
@@ -78,11 +93,20 @@ public:
 
 	/**
 	 *
+	 * @return Relative altitude of point on landing slope at distance to landing waypoint=wp_landing_distance
+	 */
+	__EXPORT static float getLandingSlopeRelativeAltitude(float wp_landing_distance, float horizontal_slope_displacement, float landing_slope_angle_rad)
+	{
+		return (wp_landing_distance - horizontal_slope_displacement) * tanf(landing_slope_angle_rad); //flare_relative_alt is negative
+	}
+
+	/**
+	 *
 	 * @return Absolute altitude of point on landing slope at distance to landing waypoint=wp_landing_distance
 	 */
 	__EXPORT static float getLandingSlopeAbsoluteAltitude(float wp_landing_distance, float wp_landing_altitude, float horizontal_slope_displacement, float landing_slope_angle_rad)
 	{
-		return (wp_landing_distance - horizontal_slope_displacement) * tanf(landing_slope_angle_rad) + wp_landing_altitude; //flare_relative_alt is negative
+		return getLandingSlopeRelativeAltitude(wp_landing_distance, horizontal_slope_displacement, landing_slope_angle_rad) + wp_landing_altitude;
 	}
 
 	/**
@@ -95,13 +119,14 @@ public:
 
 	}
 
+	float getFlareCurveRelativeAltitudeSave(float wp_distance, float bearing_lastwp_currwp, float bearing_airplane_currwp);
 
-	float getFlareCurveAltitudeSave(float wp_distance, float bearing_lastwp_currwp, float bearing_airplane_currwp, float wp_altitude);
+	float getFlareCurveAbsoluteAltitudeSave(float wp_distance, float bearing_lastwp_currwp, float bearing_airplane_currwp, float wp_altitude);
 
-	void update(float landing_slope_angle_rad,
-			float flare_relative_alt,
-			float motor_lim_relative_alt,
-			float H1_virt);
+	void update(float landing_slope_angle_rad_new,
+			float flare_relative_alt_new,
+			float motor_lim_relative_alt_new,
+			float H1_virt_new);
 
 
 	inline float landing_slope_angle_rad() {return _landing_slope_angle_rad;}
diff --git a/src/modules/fw_pos_control_l1/module.mk b/src/modules/fw_pos_control_l1/module.mk
index cf419ec7e..af155fe08 100644
--- a/src/modules/fw_pos_control_l1/module.mk
+++ b/src/modules/fw_pos_control_l1/module.mk
@@ -39,4 +39,7 @@ MODULE_COMMAND	= fw_pos_control_l1
 
 SRCS		= fw_pos_control_l1_main.cpp \
 		  fw_pos_control_l1_params.c \
-		  landingslope.cpp
+		  landingslope.cpp \
+		  mtecs/mTecs.cpp \
+		  mtecs/limitoverride.cpp \
+		  mtecs/mTecs_params.c
diff --git a/src/modules/fw_pos_control_l1/mtecs/limitoverride.cpp b/src/modules/fw_pos_control_l1/mtecs/limitoverride.cpp
new file mode 100644
index 000000000..58795edb6
--- /dev/null
+++ b/src/modules/fw_pos_control_l1/mtecs/limitoverride.cpp
@@ -0,0 +1,71 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
+ *   Author: 	@author Thomas Gubler <thomasgubler@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+
+/**
+ * @file limitoverride.cpp
+ *
+ * @author Thomas Gubler <thomasgubler@gmail.com>
+ */
+
+#include "limitoverride.h"
+
+namespace fwPosctrl {
+
+bool LimitOverride::applyOverride(BlockOutputLimiter &outputLimiterThrottle,
+		BlockOutputLimiter &outputLimiterPitch)
+{
+	bool ret = false;
+
+	if (overrideThrottleMinEnabled)	{
+		outputLimiterThrottle.setMin(overrideThrottleMin);
+		ret = true;
+	}
+	if (overrideThrottleMaxEnabled)	{
+		outputLimiterThrottle.setMax(overrideThrottleMax);
+		ret = true;
+	}
+	if (overridePitchMinEnabled)	{
+		outputLimiterPitch.setMin(overridePitchMin);
+		ret = true;
+	}
+	if (overridePitchMaxEnabled)	{
+		outputLimiterPitch.setMax(overridePitchMax);
+		ret = true;
+	}
+
+	return ret;
+}
+
+} /* namespace fwPosctrl */
diff --git a/src/modules/fw_pos_control_l1/mtecs/limitoverride.h b/src/modules/fw_pos_control_l1/mtecs/limitoverride.h
new file mode 100644
index 000000000..64c2e7bbd
--- /dev/null
+++ b/src/modules/fw_pos_control_l1/mtecs/limitoverride.h
@@ -0,0 +1,107 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
+ *   Author: 	@author Thomas Gubler <thomasgubler@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+
+/**
+ * @file limitoverride.h
+ *
+ * @author Thomas Gubler <thomasgubler@gmail.com>
+ */
+
+
+#ifndef LIMITOVERRIDE_H_
+#define LIMITOVERRIDE_H_
+
+#include "mTecs_blocks.h"
+
+namespace fwPosctrl
+{
+
+/* A small class which provides helper functions to override control output limits which are usually set by
+* parameters in special cases
+*/
+class LimitOverride
+{
+public:
+	LimitOverride() :
+		overrideThrottleMinEnabled(false),
+		overrideThrottleMaxEnabled(false),
+		overridePitchMinEnabled(false),
+		overridePitchMaxEnabled(false)
+	{};
+
+	~LimitOverride() {};
+
+	/*
+	* Override the limits of the outputlimiter instances given by the arguments with the limits saved in
+	* this class (if enabled)
+	* @return true if the limit was applied
+	*/
+	bool applyOverride(BlockOutputLimiter &outputLimiterThrottle,
+			BlockOutputLimiter &outputLimiterPitch);
+
+	/* Functions to enable or disable the override */
+	void enableThrottleMinOverride(float value) { enable(&overrideThrottleMinEnabled,
+			&overrideThrottleMin, value); }
+	void disableThrottleMinOverride() { disable(&overrideThrottleMinEnabled); }
+	void enableThrottleMaxOverride(float value) { enable(&overrideThrottleMaxEnabled,
+			&overrideThrottleMax, value); }
+	void disableThrottleMaxOverride() { disable(&overrideThrottleMaxEnabled); }
+	void enablePitchMinOverride(float value) { enable(&overridePitchMinEnabled,
+			&overridePitchMin, value); }
+	void disablePitchMinOverride() { disable(&overridePitchMinEnabled); }
+	void enablePitchMaxOverride(float value) { enable(&overridePitchMaxEnabled,
+			&overridePitchMax, value); }
+	void disablePitchMaxOverride() { disable(&overridePitchMaxEnabled); }
+
+protected:
+	bool overrideThrottleMinEnabled;
+	float overrideThrottleMin;
+	bool overrideThrottleMaxEnabled;
+	float overrideThrottleMax;
+	bool overridePitchMinEnabled;
+	float overridePitchMin; //in degrees (replaces param values)
+	bool overridePitchMaxEnabled;
+	float overridePitchMax; //in degrees (replaces param values)
+
+	/* Enable a specific limit override */
+	void enable(bool *flag, float *limit, float value) { *flag = true; *limit = value; };
+
+	/* Disable a specific limit override */
+	void disable(bool *flag) { *flag = false; };
+};
+
+} /* namespace fwPosctrl */
+
+#endif /* LIMITOVERRIDE_H_ */
diff --git a/src/modules/fw_pos_control_l1/mtecs/mTecs.cpp b/src/modules/fw_pos_control_l1/mtecs/mTecs.cpp
new file mode 100644
index 000000000..fc0a2551c
--- /dev/null
+++ b/src/modules/fw_pos_control_l1/mtecs/mTecs.cpp
@@ -0,0 +1,313 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
+ *   Author: 	@author Thomas Gubler <thomasgubler@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+
+/**
+ * @file mTecs.cpp
+ *
+ * @author Thomas Gubler <thomasgubler@gmail.com>
+ */
+
+#include "mTecs.h"
+
+#include <lib/geo/geo.h>
+#include <stdio.h>
+
+namespace fwPosctrl {
+
+mTecs::mTecs() :
+	SuperBlock(NULL, "MT"),
+	/* Parameters */
+	_mTecsEnabled(this, "ENABLED"),
+	_airspeedMin(this, "FW_AIRSPD_MIN", false),
+	/* Publications */
+	_status(&getPublications(), ORB_ID(tecs_status)),
+	/* control blocks */
+	_controlTotalEnergy(this, "THR"),
+	_controlEnergyDistribution(this, "PIT", true),
+	_controlAltitude(this, "FPA", true),
+	_controlAirSpeed(this, "ACC"),
+	_flightPathAngleLowpass(this, "FPA_LP"),
+	_airspeedLowpass(this, "A_LP"),
+	_airspeedDerivative(this, "AD"),
+	_throttleSp(0.0f),
+	_pitchSp(0.0f),
+	_BlockOutputLimiterTakeoffThrottle(this, "TKF_THR"),
+	_BlockOutputLimiterTakeoffPitch(this, "TKF_PIT", true),
+	_BlockOutputLimiterUnderspeedThrottle(this, "USP_THR"),
+	_BlockOutputLimiterUnderspeedPitch(this, "USP_PIT", true),
+	_BlockOutputLimiterLandThrottle(this, "LND_THR"),
+	_BlockOutputLimiterLandPitch(this, "LND_PIT", true),
+	timestampLastIteration(hrt_absolute_time()),
+	_firstIterationAfterReset(true),
+	_dtCalculated(false),
+	_counter(0),
+	_debug(false)
+{
+}
+
+mTecs::~mTecs()
+{
+}
+
+int mTecs::updateAltitudeSpeed(float flightPathAngle, float altitude, float altitudeSp, float airspeed,
+		float airspeedSp, tecs_mode mode, LimitOverride limitOverride)
+{
+	/* check if all input arguments are numbers and abort if not so */
+	if (!isfinite(flightPathAngle) || !isfinite(altitude) ||
+			!isfinite(altitudeSp) || !isfinite(airspeed) || !isfinite(airspeedSp) || !isfinite(mode)) {
+		return -1;
+	}
+
+	/* time measurement */
+	updateTimeMeasurement();
+
+	/* calculate flight path angle setpoint from altitude setpoint */
+	float flightPathAngleSp = _controlAltitude.update(altitudeSp - altitude);
+
+	/* Debug output */
+	if (_counter % 10 == 0) {
+		debug("***");
+		debug("updateAltitudeSpeed: altitudeSp %.4f, altitude %.4f, flightPathAngleSp %.4f", (double)altitudeSp, (double)altitude, (double)flightPathAngleSp);
+	}
+
+	/* Write part of the status message */
+	_status.altitudeSp = altitudeSp;
+	_status.altitude = altitude;
+
+
+	/* use flightpath angle setpoint for total energy control */
+	return updateFlightPathAngleSpeed(flightPathAngle, flightPathAngleSp, airspeed,
+			airspeedSp, mode, limitOverride);
+}
+
+int mTecs::updateFlightPathAngleSpeed(float flightPathAngle, float flightPathAngleSp, float airspeed,
+		float airspeedSp, tecs_mode mode, LimitOverride limitOverride)
+{
+	/* check if all input arguments are numbers and abort if not so */
+	if (!isfinite(flightPathAngle) || !isfinite(flightPathAngleSp) ||
+			!isfinite(airspeed) || !isfinite(airspeedSp) || !isfinite(mode)) {
+		return -1;
+	}
+
+	/* time measurement */
+	updateTimeMeasurement();
+
+	/* Filter airspeed */
+	float airspeedFiltered = _airspeedLowpass.update(airspeed);
+
+	/* calculate longitudinal acceleration setpoint from airspeed setpoint*/
+	float accelerationLongitudinalSp = _controlAirSpeed.update(airspeedSp - airspeedFiltered);
+
+	/* Debug output */
+	if (_counter % 10 == 0) {
+		debug("updateFlightPathAngleSpeed airspeedSp %.4f, airspeed %.4f airspeedFiltered %.4f,"
+				"accelerationLongitudinalSp%.4f",
+				(double)airspeedSp, (double)airspeed,
+				(double)airspeedFiltered, (double)accelerationLongitudinalSp);
+	}
+
+	/* Write part of the status message */
+	_status.airspeedSp = airspeedSp;
+	_status.airspeed = airspeed;
+	_status.airspeedFiltered = airspeedFiltered;
+
+
+	/* use longitudinal acceleration setpoint for total energy control */
+	return updateFlightPathAngleAcceleration(flightPathAngle, flightPathAngleSp, airspeedFiltered,
+			accelerationLongitudinalSp, mode, limitOverride);
+}
+
+int mTecs::updateFlightPathAngleAcceleration(float flightPathAngle, float flightPathAngleSp, float airspeedFiltered,
+		float accelerationLongitudinalSp, tecs_mode mode, LimitOverride limitOverride)
+{
+	/* check if all input arguments are numbers and abort if not so */
+	if (!isfinite(flightPathAngle) || !isfinite(flightPathAngleSp) ||
+			!isfinite(airspeedFiltered) || !isfinite(accelerationLongitudinalSp) || !isfinite(mode)) {
+		return -1;
+	}
+	/* time measurement */
+	updateTimeMeasurement();
+
+	/* update parameters first */
+	updateParams();
+
+	/* Filter flightpathangle */
+	float flightPathAngleFiltered = _flightPathAngleLowpass.update(flightPathAngle);
+
+	/* calculate values (energies) */
+	float flightPathAngleError = flightPathAngleSp - flightPathAngleFiltered;
+	float airspeedDerivative = 0.0f;
+	if(_airspeedDerivative.getDt() > 0.0f) {
+		airspeedDerivative = _airspeedDerivative.update(airspeedFiltered);
+	}
+	float airspeedDerivativeNorm = airspeedDerivative / CONSTANTS_ONE_G;
+	float airspeedDerivativeSp = accelerationLongitudinalSp;
+	float airspeedDerivativeNormSp = airspeedDerivativeSp / CONSTANTS_ONE_G;
+	float airspeedDerivativeNormError = airspeedDerivativeNormSp - airspeedDerivativeNorm;
+
+	float totalEnergyRate = flightPathAngleFiltered + airspeedDerivativeNorm;
+	float totalEnergyRateError = flightPathAngleError + airspeedDerivativeNormError;
+	float totalEnergyRateSp = flightPathAngleSp + airspeedDerivativeNormSp;
+	float totalEnergyRateError2 = totalEnergyRateSp - totalEnergyRate;
+
+	float energyDistributionRate = flightPathAngleFiltered - airspeedDerivativeNorm;
+	float energyDistributionRateError = flightPathAngleError - airspeedDerivativeNormError;
+	float energyDistributionRateSp = flightPathAngleSp - airspeedDerivativeNormSp;
+	float energyDistributionRateError2 = energyDistributionRateSp - energyDistributionRate;
+
+	/* Debug output */
+	if (_counter % 10 == 0) {
+		debug("totalEnergyRateSp %.2f, totalEnergyRate %.2f, totalEnergyRateError %.2f totalEnergyRateError2 %.2f airspeedDerivativeNorm %.4f",
+				(double)totalEnergyRateSp, (double)totalEnergyRate, (double)totalEnergyRateError, (double)totalEnergyRateError2, (double)airspeedDerivativeNorm);
+		debug("energyDistributionRateSp %.2f, energyDistributionRate %.2f, energyDistributionRateError %.2f energyDistributionRateError2 %.2f",
+				(double)energyDistributionRateSp, (double)energyDistributionRate, (double)energyDistributionRateError, (double)energyDistributionRateError2);
+	}
+
+	/* Check airspeed: if below safe value switch to underspeed mode (if not in land or takeoff mode) */
+	if (mode != TECS_MODE_LAND && mode != TECS_MODE_TAKEOFF && airspeedFiltered < _airspeedMin.get()) {
+		mode = TECS_MODE_UNDERSPEED;
+	}
+
+	/* Set special ouput limiters if we are not in TECS_MODE_NORMAL */
+	BlockOutputLimiter *outputLimiterThrottle = &_controlTotalEnergy.getOutputLimiter();
+	BlockOutputLimiter *outputLimiterPitch = &_controlEnergyDistribution.getOutputLimiter();
+	if (mode == TECS_MODE_TAKEOFF) {
+		outputLimiterThrottle = &_BlockOutputLimiterTakeoffThrottle;
+		outputLimiterPitch = &_BlockOutputLimiterTakeoffPitch;
+	} else if (mode == TECS_MODE_LAND) {
+		// only limit pitch but do not limit throttle
+		outputLimiterPitch = &_BlockOutputLimiterLandPitch;
+	} else if (mode == TECS_MODE_LAND_THROTTLELIM) {
+		outputLimiterThrottle = &_BlockOutputLimiterLandThrottle;
+		outputLimiterPitch = &_BlockOutputLimiterLandPitch;
+	} else if (mode == TECS_MODE_UNDERSPEED) {
+		outputLimiterThrottle = &_BlockOutputLimiterUnderspeedThrottle;
+		outputLimiterPitch = &_BlockOutputLimiterUnderspeedPitch;
+	}
+
+	/* Apply overrride given by the limitOverride argument (this is used for limits which are not given by
+	 * parameters such as pitch limits with takeoff waypoints or throttle limits when the launchdetector
+	 * is running) */
+	bool limitApplied = limitOverride.applyOverride(*outputLimiterThrottle, *outputLimiterPitch);
+
+	/* Write part of the status message */
+	_status.flightPathAngleSp = flightPathAngleSp;
+	_status.flightPathAngle = flightPathAngle;
+	_status.flightPathAngleFiltered = flightPathAngleFiltered;
+	_status.airspeedDerivativeSp = airspeedDerivativeSp;
+	_status.airspeedDerivative = airspeedDerivative;
+	_status.totalEnergyRateSp = totalEnergyRateSp;
+	_status.totalEnergyRate = totalEnergyRate;
+	_status.energyDistributionRateSp = energyDistributionRateSp;
+	_status.energyDistributionRate = energyDistributionRate;
+	_status.mode = mode;
+
+	/** update control blocks **/
+	/* update total energy rate control block */
+	_throttleSp = _controlTotalEnergy.update(totalEnergyRateSp, totalEnergyRateError, outputLimiterThrottle);
+
+	/* update energy distribution rate control block */
+	_pitchSp = _controlEnergyDistribution.update(energyDistributionRateSp, energyDistributionRateError, outputLimiterPitch);
+
+
+	if (_counter % 10 == 0) {
+		debug("_throttleSp %.1f, _pitchSp %.1f, flightPathAngleSp %.1f, flightPathAngle %.1f accelerationLongitudinalSp %.1f, airspeedDerivative %.1f",
+				(double)_throttleSp, (double)_pitchSp,
+				(double)flightPathAngleSp, (double)flightPathAngle,
+				(double)accelerationLongitudinalSp, (double)airspeedDerivative);
+	}
+
+	/* publish status messge */
+	_status.update();
+
+	/* clean up */
+	_firstIterationAfterReset = false;
+	_dtCalculated = false;
+
+	_counter++;
+
+	return 0;
+}
+
+void mTecs::resetIntegrators()
+{
+	_controlTotalEnergy.getIntegral().setY(0.0f);
+	_controlEnergyDistribution.getIntegral().setY(0.0f);
+	timestampLastIteration = hrt_absolute_time();
+	_firstIterationAfterReset = true;
+}
+
+void mTecs::resetDerivatives(float airspeed)
+{
+	_airspeedDerivative.setU(airspeed);
+}
+
+
+void mTecs::updateTimeMeasurement()
+{
+	if (!_dtCalculated) {
+		float deltaTSeconds = 0.0f;
+		if (!_firstIterationAfterReset) {
+			hrt_abstime timestampNow = hrt_absolute_time();
+			deltaTSeconds = (float)(timestampNow - timestampLastIteration) * 1e-6f;
+			timestampLastIteration = timestampNow;
+		}
+		setDt(deltaTSeconds);
+
+		_dtCalculated = true;
+	}
+}
+
+void mTecs::debug_print(const char *fmt, va_list args)
+{
+	fprintf(stderr, "%s: ", "[mtecs]");
+	vfprintf(stderr, fmt, args);
+
+	fprintf(stderr, "\n");
+}
+
+void mTecs::debug(const char *fmt, ...) {
+
+	if (!_debug) {
+		return;
+	}
+
+	va_list args;
+
+	va_start(args, fmt);
+	debug_print(fmt, args);
+}
+
+} /* namespace fwPosctrl */
diff --git a/src/modules/fw_pos_control_l1/mtecs/mTecs.h b/src/modules/fw_pos_control_l1/mtecs/mTecs.h
new file mode 100644
index 000000000..efa89a5d3
--- /dev/null
+++ b/src/modules/fw_pos_control_l1/mtecs/mTecs.h
@@ -0,0 +1,155 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
+ *   Author: 	@author Thomas Gubler <thomasgubler@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+
+/**
+ * @file mTecs.h
+ *
+ * @author Thomas Gubler <thomasgubler@gmail.com>
+ */
+
+
+#ifndef MTECS_H_
+#define MTECS_H_
+
+#include "mTecs_blocks.h"
+#include "limitoverride.h"
+
+#include <controllib/block/BlockParam.hpp>
+#include <drivers/drv_hrt.h>
+#include <uORB/Publication.hpp>
+#include <uORB/topics/tecs_status.h>
+
+namespace fwPosctrl
+{
+
+/* Main class of the mTecs */
+class mTecs : public control::SuperBlock
+{
+public:
+	mTecs();
+	virtual ~mTecs();
+
+	/*
+	 * Control in altitude setpoint and speed mode
+	 */
+	int updateAltitudeSpeed(float flightPathAngle, float altitude, float altitudeSp, float airspeed,
+			float airspeedSp, tecs_mode mode, LimitOverride limitOverride);
+
+	/*
+	 * Control in flightPathAngle setpoint (flollow a slope etc.) and speed mode
+	 */
+	int updateFlightPathAngleSpeed(float flightPathAngle, float flightPathAngleSp, float airspeed,
+			float airspeedSp, tecs_mode mode, LimitOverride limitOverride);
+
+	/*
+	 * Control in flightPathAngle setpoint (flollow a slope etc.) and acceleration mode (base case)
+	 */
+	int updateFlightPathAngleAcceleration(float flightPathAngle, float flightPathAngleSp, float airspeedFiltered,
+			float accelerationLongitudinalSp, tecs_mode mode, LimitOverride limitOverride);
+
+	/*
+	 * Reset all integrators
+	 */
+	void resetIntegrators();
+
+	/*
+	 * Reset all derivative calculations
+	 */
+	void resetDerivatives(float airspeed);
+
+	/* Accessors */
+	bool getEnabled() { return _mTecsEnabled.get() > 0; }
+	float getThrottleSetpoint() { return _throttleSp; }
+	float getPitchSetpoint() { return _pitchSp; }
+	float airspeedLowpassUpdate(float input) { return _airspeedLowpass.update(input); }
+
+protected:
+	/* parameters */
+	control::BlockParamInt _mTecsEnabled;		/**< 1 if mTecs is enabled */
+	control::BlockParamFloat _airspeedMin;		/**< minimal airspeed */
+
+	/* Publications */
+	uORB::Publication<tecs_status_s> _status;	/**< publish internal values for logging */
+
+	/* control blocks */
+	BlockFFPILimitedCustom _controlTotalEnergy;		/**< FFPI controller for total energy control: output
+								  is throttle */
+	BlockFFPILimitedCustom _controlEnergyDistribution;	/**< FFPI controller for energy distribution control:
+								  output is pitch */
+	BlockPDLimited	_controlAltitude;			/**< PD controller for altitude: output is the flight
+								  path angle setpoint */
+	BlockPDLimited	_controlAirSpeed;			/**< PD controller for airspeed: output is acceleration
+								  setpoint */
+
+	/* Other calculation Blocks */
+	control::BlockLowPass _flightPathAngleLowpass;	/**< low pass filter for the flight path angle */
+	control::BlockLowPass _airspeedLowpass;		/**< low pass filter for airspeed */
+	control::BlockDerivative _airspeedDerivative;	/**< airspeed derivative calulation */
+
+	/* Output setpoints */
+	float _throttleSp;				/**< Throttle Setpoint from 0 to 1 */
+	float _pitchSp;					/**< Pitch Setpoint from -pi to pi */
+
+	/* Output Limits in special modes */
+	BlockOutputLimiter _BlockOutputLimiterTakeoffThrottle;	    /**< Throttle Limits during takeoff */
+	BlockOutputLimiter _BlockOutputLimiterTakeoffPitch;	    /**< Pitch Limit during takeoff */
+	BlockOutputLimiter _BlockOutputLimiterUnderspeedThrottle;   /**< Throttle Limits when underspeed is detected */
+	BlockOutputLimiter _BlockOutputLimiterUnderspeedPitch;	    /**< Pitch Limit when underspeed is detected */
+	BlockOutputLimiter _BlockOutputLimiterLandThrottle;	    /**< Throttle Limits during landing (only in
+								      last phase)*/
+	BlockOutputLimiter _BlockOutputLimiterLandPitch;	    /**< Pitch Limit during landing */
+
+	/* Time measurements */
+	hrt_abstime timestampLastIteration;	/**< Saves the result of hrt_absolute_time() of the last iteration */
+
+	bool _firstIterationAfterReset;		/**< True during the first iteration after a reset */
+	bool _dtCalculated;			/**< True if dt has been calculated in this iteration */
+
+	int _counter;
+	bool _debug;				///< Set true to enable debug output
+
+
+	static void	debug_print(const char *fmt, va_list args);
+	void		debug(const char *fmt, ...);
+
+	/*
+	 * Measure and update the time step dt if this was not already done in the current iteration
+	 */
+	void updateTimeMeasurement();
+};
+
+} /* namespace fwPosctrl */
+
+#endif /* MTECS_H_ */
diff --git a/src/modules/fw_pos_control_l1/mtecs/mTecs_blocks.h b/src/modules/fw_pos_control_l1/mtecs/mTecs_blocks.h
new file mode 100644
index 000000000..e4e405227
--- /dev/null
+++ b/src/modules/fw_pos_control_l1/mtecs/mTecs_blocks.h
@@ -0,0 +1,220 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
+ *   Author: 	@author Thomas Gubler <thomasgubler@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+
+/**
+ * @file mTecs_blocks.h
+ *
+ * Custom blocks for the mTecs
+ *
+ * @author Thomas Gubler <thomasgubler@gmail.com>
+ */
+
+#pragma once
+
+#include <controllib/blocks.hpp>
+#include <systemlib/err.h>
+
+namespace fwPosctrl
+{
+
+using namespace control;
+
+/* An block which can be used to limit the output */
+class BlockOutputLimiter: public SuperBlock
+{
+public:
+// methods
+	BlockOutputLimiter(SuperBlock *parent, const char *name, bool isAngularLimit = false) :
+		SuperBlock(parent, name),
+		_isAngularLimit(isAngularLimit),
+		_min(this, "MIN"),
+		_max(this, "MAX")
+	{};
+	virtual ~BlockOutputLimiter() {};
+	/*
+	 * Imposes the limits given by _min and _max on value
+	 *
+	 * @param value is changed to be on the interval _min to _max
+	 * @param difference if the value is changed this corresponds to the change of value * (-1)
+     * otherwise unchanged
+	 * @return: true if the limit is applied, false otherwise
+	 */
+	bool limit(float& value, float& difference) {
+		float minimum = isAngularLimit() ? getMin() * M_DEG_TO_RAD_F : getMin();
+		float maximum = isAngularLimit() ? getMax() * M_DEG_TO_RAD_F : getMax();
+		if (value < minimum) {
+			difference = value - minimum;
+			value = minimum;
+			return true;
+		} else if (value > maximum) {
+			difference = value - maximum;
+			value = maximum;
+			return true;
+		}
+		return false;
+	}
+//accessor:
+	bool isAngularLimit() {return _isAngularLimit ;}
+	float getMin() { return _min.get(); }
+	float getMax() { return _max.get(); }
+	void setMin(float value) { _min.set(value); }
+	void setMax(float value) { _max.set(value); }
+protected:
+//attributes
+	bool _isAngularLimit;
+	control::BlockParamFloat _min;
+	control::BlockParamFloat _max;
+};
+
+
+/* A combination of feed forward, P and I gain using the output limiter*/
+class BlockFFPILimited: public SuperBlock
+{
+public:
+// methods
+	BlockFFPILimited(SuperBlock *parent, const char *name, bool isAngularLimit = false) :
+		SuperBlock(parent, name),
+		_outputLimiter(this, "", isAngularLimit),
+		_integral(this, "I"),
+		_kFF(this, "FF"),
+		_kP(this, "P"),
+		_kI(this, "I"),
+		_offset(this, "OFF")
+	{};
+	virtual ~BlockFFPILimited() {};
+	float update(float inputValue, float inputError) { return calcLimitedOutput(inputValue, inputError, _outputLimiter); }
+// accessors
+	BlockIntegral &getIntegral() { return _integral; }
+	float getKFF() { return _kFF.get(); }
+	float getKP() { return _kP.get(); }
+	float getKI() { return _kI.get(); }
+	float getOffset() { return _offset.get(); }
+	BlockOutputLimiter &getOutputLimiter() { return _outputLimiter; };
+protected:
+	BlockOutputLimiter _outputLimiter;
+
+	float calcUnlimitedOutput(float inputValue, float inputError) {return getOffset() + getKFF() * inputValue + getKP() * inputError + getKI() * getIntegral().update(inputError);}
+	float calcLimitedOutput(float inputValue, float inputError, BlockOutputLimiter &outputLimiter) {
+		float difference = 0.0f;
+		float integralYPrevious = _integral.getY();
+		float output = calcUnlimitedOutput(inputValue, inputError);
+		if(outputLimiter.limit(output, difference) &&
+			(((difference < 0) && (getKI() * getIntegral().getY() < 0)) ||
+			((difference > 0) && (getKI() * getIntegral().getY() > 0)))) {
+				getIntegral().setY(integralYPrevious);
+		}
+		return output;
+	}
+private:
+	BlockIntegral _integral;
+	BlockParamFloat _kFF;
+	BlockParamFloat _kP;
+	BlockParamFloat _kI;
+	BlockParamFloat _offset;
+};
+
+/* A combination of feed forward, P and I gain using the output limiter with the option to provide a special output limiter (for example for takeoff)*/
+class BlockFFPILimitedCustom: public BlockFFPILimited
+{
+public:
+// methods
+	BlockFFPILimitedCustom(SuperBlock *parent, const char *name, bool isAngularLimit = false) :
+		BlockFFPILimited(parent, name, isAngularLimit)
+		{};
+	virtual ~BlockFFPILimitedCustom() {};
+	float update(float inputValue, float inputError, BlockOutputLimiter *outputLimiter = NULL) {
+		return calcLimitedOutput(inputValue, inputError, outputLimiter == NULL ? _outputLimiter : *outputLimiter);
+	}
+};
+
+/* A combination of P gain and output limiter */
+class BlockPLimited: public SuperBlock
+{
+public:
+// methods
+	BlockPLimited(SuperBlock *parent, const char *name, bool isAngularLimit = false) :
+		SuperBlock(parent, name),
+		_kP(this, "P"),
+		_outputLimiter(this, "", isAngularLimit)
+	{};
+	virtual ~BlockPLimited() {};
+	float update(float input) {
+		float difference = 0.0f;
+		float output = getKP() * input;
+		getOutputLimiter().limit(output, difference);
+		return output;
+	}
+// accessors
+	BlockOutputLimiter &getOutputLimiter() { return _outputLimiter; };
+	float getKP() { return _kP.get(); }
+private:
+	control::BlockParamFloat _kP;
+	BlockOutputLimiter _outputLimiter;
+};
+
+/* A combination of P, D gains and output limiter */
+class BlockPDLimited: public SuperBlock
+{
+public:
+// methods
+	BlockPDLimited(SuperBlock *parent, const char *name, bool isAngularLimit = false) :
+		SuperBlock(parent, name),
+		_kP(this, "P"),
+		_kD(this, "D"),
+		_derivative(this, "D"),
+		_outputLimiter(this, "", isAngularLimit)
+	{};
+	virtual ~BlockPDLimited() {};
+	float update(float input) {
+		float difference = 0.0f;
+		float output = getKP() * input + (getDerivative().getDt() > 0.0f ? getKD() * getDerivative().update(input) : 0.0f);
+		getOutputLimiter().limit(output, difference);
+
+		return output;
+	}
+// accessors
+	float getKP() { return _kP.get(); }
+	float getKD() { return _kD.get(); }
+	BlockDerivative &getDerivative() { return _derivative; }
+	BlockOutputLimiter &getOutputLimiter() { return _outputLimiter; };
+private:
+	control::BlockParamFloat _kP;
+	control::BlockParamFloat _kD;
+	BlockDerivative _derivative;
+	BlockOutputLimiter _outputLimiter;
+};
+
+}
+
diff --git a/src/modules/fw_pos_control_l1/mtecs/mTecs_params.c b/src/modules/fw_pos_control_l1/mtecs/mTecs_params.c
new file mode 100644
index 000000000..5b9238780
--- /dev/null
+++ b/src/modules/fw_pos_control_l1/mtecs/mTecs_params.c
@@ -0,0 +1,419 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
+ *   Author: 	@author Thomas Gubler <thomasgubler@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+
+/**
+ * @file mTecs_params.c
+ *
+ * @author Thomas Gubler <thomasgubler@gmail.com>
+ */
+
+#include <nuttx/config.h>
+#include <systemlib/param/param.h>
+
+/*
+ * Controller parameters, accessible via MAVLink
+ */
+
+/**
+ * mTECS enabled
+ *
+ * Set to 1 to enable mTECS
+ *
+ * @min 0
+ * @max 1
+ * @group mTECS
+ */
+PARAM_DEFINE_INT32(MT_ENABLED, 1);
+
+/**
+ * Total Energy Rate Control Feedforward
+ * Maps the total energy rate setpoint to the throttle setpoint
+ *
+ * @min 0.0
+ * @max 10.0
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_THR_FF, 0.7f);
+
+/**
+ * Total Energy Rate Control P
+ * Maps the total energy rate error to the throttle setpoint
+ *
+ * @min 0.0
+ * @max 10.0
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_THR_P, 0.1f);
+
+/**
+ * Total Energy Rate Control I
+ * Maps the integrated total energy rate to the throttle setpoint
+ *
+ * @min 0.0
+ * @max 10.0
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_THR_I, 0.25f);
+
+/**
+ * Total Energy Rate Control Offset (Cruise throttle sp)
+ *
+ * @min 0.0
+ * @max 10.0
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_THR_OFF, 0.7f);
+
+/**
+ * Energy Distribution Rate Control Feedforward
+ * Maps the energy distribution rate setpoint to the pitch setpoint
+ *
+ * @min 0.0
+ * @max 10.0
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_PIT_FF, 0.4f);
+
+/**
+ * Energy Distribution Rate Control P
+ * Maps the energy distribution rate error to the pitch setpoint
+ *
+ * @min 0.0
+ * @max 10.0
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_PIT_P, 0.03f);
+
+/**
+ * Energy Distribution Rate Control I
+ * Maps the integrated energy distribution rate error to the pitch setpoint
+ *
+ * @min 0.0
+ * @max 10.0
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_PIT_I, 0.03f);
+
+
+/**
+ * Total Energy Distribution Offset (Cruise pitch sp)
+ *
+ * @min 0.0
+ * @max 10.0
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_PIT_OFF, 0.0f);
+
+/**
+ * Minimal Throttle Setpoint
+ *
+ * @min 0.0
+ * @max 1.0
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_THR_MIN, 0.0f);
+
+/**
+ * Maximal Throttle Setpoint
+ *
+ * @min 0.0
+ * @max 1.0
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_THR_MAX, 1.0f);
+
+/**
+ * Minimal Pitch Setpoint in Degrees
+ *
+ * @min -90.0f
+ * @max 90.0f
+ * @unit deg
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_PIT_MIN, -45.0f);
+
+/**
+ * Maximal Pitch Setpoint in Degrees
+ *
+ * @min -90.0f
+ * @max 90.0f
+ * @unit deg
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_PIT_MAX, 20.0f);
+
+/**
+ * Lowpass (cutoff freq.) for the flight path angle
+ *
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_FPA_LP, 1.0f);
+
+/**
+ * P gain for the altitude control
+ * Maps the altitude error to the flight path angle setpoint
+ *
+ * @min 0.0f
+ * @max 10.0f
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_FPA_P, 0.3f);
+
+/**
+ * D gain for the altitude control
+ * Maps the change of altitude error to the flight path angle setpoint
+ *
+ * @min 0.0f
+ * @max 10.0f
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_FPA_D, 0.0f);
+
+/**
+ * Lowpass for FPA error derivative calculation (see MT_FPA_D)
+ *
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_FPA_D_LP, 1.0f);
+
+
+/**
+ * Minimal flight path angle setpoint
+ *
+ * @min -90.0f
+ * @max 90.0f
+ * @unit deg
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_FPA_MIN, -20.0f);
+
+/**
+ * Maximal flight path angle setpoint
+ *
+ * @min -90.0f
+ * @max 90.0f
+ * @unit deg
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_FPA_MAX, 30.0f);
+
+/**
+ * Lowpass (cutoff freq.) for airspeed
+ *
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_A_LP, 1.0f);
+
+/**
+ * P gain for the airspeed control
+ * Maps the airspeed error to the acceleration setpoint
+ *
+ * @min 0.0f
+ * @max 10.0f
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_ACC_P, 0.3f);
+
+/**
+ * D gain for the airspeed control
+ * Maps the change of airspeed error to the acceleration setpoint
+ *
+ * @min 0.0f
+ * @max 10.0f
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_ACC_D, 0.0f);
+
+/**
+ * Lowpass for ACC error derivative calculation (see MT_ACC_D)
+ *
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_ACC_D_LP, 1.0f);
+
+/**
+ * Minimal acceleration (air)
+ *
+ * @unit m/s^2
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_ACC_MIN, -40.0f);
+
+/**
+ * Maximal acceleration (air)
+ *
+* @unit m/s^2
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_ACC_MAX, 40.0f);
+
+/**
+ * Airspeed derivative calculation lowpass
+ *
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_AD_LP, 1.0f);
+
+/**
+ * Minimal throttle during takeoff
+ *
+ * @min 0.0f
+ * @max 1.0f
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_TKF_THR_MIN, 1.0f);
+
+/**
+ * Maximal throttle during takeoff
+ *
+ * @min 0.0f
+ * @max 1.0f
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_TKF_THR_MAX, 1.0f);
+
+/**
+ * Minimal pitch during takeoff
+ *
+ * @min -90.0f
+ * @max 90.0f
+ * @unit deg
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_TKF_PIT_MIN, 0.0f);
+
+/**
+ * Maximal pitch during takeoff
+ *
+ * @min -90.0f
+ * @max 90.0f
+ * @unit deg
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_TKF_PIT_MAX, 45.0f);
+
+/**
+ * Minimal throttle in underspeed mode
+ *
+ * @min 0.0f
+ * @max 1.0f
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_USP_THR_MIN, 1.0f);
+
+/**
+ * Maximal throttle in underspeed mode
+ *
+ * @min 0.0f
+ * @max 1.0f
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_USP_THR_MAX, 1.0f);
+
+/**
+ * Minimal pitch in underspeed mode
+ *
+ * @min -90.0f
+ * @max 90.0f
+ * @unit deg
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_USP_PIT_MIN, -45.0f);
+
+/**
+ * Maximal pitch in underspeed mode
+ *
+ * @min -90.0f
+ * @max 90.0f
+ * @unit deg
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_USP_PIT_MAX, 0.0f);
+
+/**
+ * Minimal throttle in landing mode (only last phase of landing)
+ *
+ * @min 0.0f
+ * @max 1.0f
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_LND_THR_MIN, 0.0f);
+
+/**
+ * Maximal throttle in landing mode (only last phase of landing)
+ *
+ * @min 0.0f
+ * @max 1.0f
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_LND_THR_MAX, 0.0f);
+
+/**
+ * Minimal pitch in landing mode
+ *
+ * @min -90.0f
+ * @max 90.0f
+ * @unit deg
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_LND_PIT_MIN, -5.0f);
+
+/**
+ * Maximal pitch in landing mode
+ *
+ * @min -90.0f
+ * @max 90.0f
+ * @unit deg
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_LND_PIT_MAX, 15.0f);
+
+/**
+ * Integrator Limit for Total Energy Rate Control
+ *
+ * @min 0.0f
+ * @max 10.0f
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_THR_I_MAX, 10.0f);
+
+/**
+ * Integrator Limit for Energy Distribution Rate Control
+ *
+ * @min 0.0f
+ * @max 10.0f
+ * @group mTECS
+ */
+PARAM_DEFINE_FLOAT(MT_PIT_I_MAX, 10.0f);
diff --git a/src/modules/gpio_led/gpio_led.c b/src/modules/gpio_led/gpio_led.c
index 6dfd22fdf..7758faed7 100644
--- a/src/modules/gpio_led/gpio_led.c
+++ b/src/modules/gpio_led/gpio_led.c
@@ -181,16 +181,13 @@ int gpio_led_main(int argc, char *argv[])
 			} else {
 				gpio_led_started = true;
 				warnx("start, using pin: %s", pin_name);
+				exit(0);
 			}
-
-			exit(0);
-
-
 		} else if (!strcmp(argv[1], "stop")) {
 			if (gpio_led_started) {
 				gpio_led_started = false;
 				warnx("stop");
-
+				exit(0);
 			} else {
 				errx(1, "not running");
 			}
@@ -264,7 +261,7 @@ void gpio_led_cycle(FAR void *arg)
 		pattern = 0x2A;	// *_*_*_ fast blink (armed, error)
 
 	} else if (priv->status.arming_state == ARMING_STATE_ARMED) {
-		if (priv->status.battery_warning == VEHICLE_BATTERY_WARNING_NONE && priv->status.failsafe_state == FAILSAFE_STATE_NORMAL) {
+		if (priv->status.battery_warning == VEHICLE_BATTERY_WARNING_NONE && !priv->status.failsafe) {
 			pattern = 0x3f;	// ****** solid (armed)
 
 		} else {
diff --git a/src/modules/mavlink/mavlink.c b/src/modules/mavlink/mavlink.c
index ad435b251..e49288a74 100644
--- a/src/modules/mavlink/mavlink.c
+++ b/src/modules/mavlink/mavlink.c
@@ -62,6 +62,12 @@ PARAM_DEFINE_INT32(MAV_COMP_ID, 50);
  * @group MAVLink
  */
 PARAM_DEFINE_INT32(MAV_TYPE, MAV_TYPE_FIXED_WING);
+/**
+ * Use/Accept HIL GPS message (even if not in HIL mode)
+ * If set to 1 incomming HIL GPS messages are parsed.
+ * @group MAVLink
+ */
+PARAM_DEFINE_INT32(MAV_USEHILGPS, 0);
 
 mavlink_system_t mavlink_system = {
 	100,
diff --git a/src/modules/mavlink/mavlink_commands.cpp b/src/modules/mavlink/mavlink_commands.cpp
new file mode 100644
index 000000000..fccd4d9a5
--- /dev/null
+++ b/src/modules/mavlink/mavlink_commands.cpp
@@ -0,0 +1,70 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file mavlink_commands.cpp
+ * Mavlink commands stream implementation.
+ *
+ * @author Anton Babushkin <anton.babushkin@me.com>
+ */
+
+#include "mavlink_commands.h"
+
+MavlinkCommandsStream::MavlinkCommandsStream(Mavlink *mavlink, mavlink_channel_t channel) : _channel(channel), _cmd_time(0)
+{
+	_cmd_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_command));
+}
+
+void
+MavlinkCommandsStream::update(const hrt_abstime t)
+{
+	struct vehicle_command_s cmd;
+
+	if (_cmd_sub->update(&_cmd_time, &cmd)) {
+		/* only send commands for other systems/components */
+		if (cmd.target_system != mavlink_system.sysid || cmd.target_component != mavlink_system.compid) {
+			mavlink_msg_command_long_send(_channel,
+						      cmd.target_system,
+						      cmd.target_component,
+						      cmd.command,
+						      cmd.confirmation,
+						      cmd.param1,
+						      cmd.param2,
+						      cmd.param3,
+						      cmd.param4,
+						      cmd.param5,
+						      cmd.param6,
+						      cmd.param7);
+		}
+	}
+}
diff --git a/src/modules/fixedwing_att_control/fixedwing_att_control_att.h b/src/modules/mavlink/mavlink_commands.h
index 600e35b89..abdba34b9 100644
--- a/src/modules/fixedwing_att_control/fixedwing_att_control_att.h
+++ b/src/modules/mavlink/mavlink_commands.h
@@ -1,8 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: @author Thomas Gubler <thomasgubler@student.ethz.ch>
- *
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -33,19 +31,35 @@
  *
  ****************************************************************************/
 
-/* @file Fixed Wing Attitude Control */
+/**
+ * @file mavlink_commands.h
+ * Mavlink commands stream definition.
+ *
+ * @author Anton Babushkin <anton.babushkin@me.com>
+ */
+
+#ifndef MAVLINK_COMMANDS_H_
+#define MAVLINK_COMMANDS_H_
+
+#include <uORB/uORB.h>
+#include <uORB/topics/vehicle_command.h>
+
+class Mavlink;
+class MavlinkCommansStream;
 
-#ifndef FIXEDWING_ATT_CONTROL_ATT_H_
-#define FIXEDWING_ATT_CONTROL_ATT_H_
+#include "mavlink_main.h"
 
-#include <uORB/topics/vehicle_rates_setpoint.h>
-#include <uORB/topics/vehicle_attitude_setpoint.h>
-#include <uORB/topics/vehicle_attitude.h>
-#include <uORB/topics/vehicle_global_position.h>
+class MavlinkCommandsStream
+{
+private:
+	MavlinkOrbSubscription *_cmd_sub;
+	struct vehicle_command_s *_cmd;
+	mavlink_channel_t _channel;
+	uint64_t _cmd_time;
 
-int fixedwing_att_control_attitude(const struct vehicle_attitude_setpoint_s *att_sp,
-				   const struct vehicle_attitude_s *att,
-				   const float speed_body[],
-				   struct vehicle_rates_setpoint_s *rates_sp);
+public:
+	MavlinkCommandsStream(Mavlink *mavlink, mavlink_channel_t channel);
+	void update(const hrt_abstime t);
+};
 
-#endif /* FIXEDWING_ATT_CONTROL_ATT_H_ */
+#endif /* MAVLINK_COMMANDS_H_ */
diff --git a/src/modules/mavlink/mavlink_ftp.cpp b/src/modules/mavlink/mavlink_ftp.cpp
new file mode 100644
index 000000000..ca846a465
--- /dev/null
+++ b/src/modules/mavlink/mavlink_ftp.cpp
@@ -0,0 +1,415 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#include <crc32.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <fcntl.h>
+
+#include "mavlink_ftp.h"
+
+MavlinkFTP *MavlinkFTP::_server;
+
+MavlinkFTP *
+MavlinkFTP::getServer()
+{
+	// XXX this really cries out for some locking...
+	if (_server == nullptr) {
+		_server = new MavlinkFTP;
+	}
+	return _server;
+}
+
+MavlinkFTP::MavlinkFTP()
+{
+	// initialise the request freelist
+	dq_init(&_workFree);
+	sem_init(&_lock, 0, 1);
+    
+    // initialize session list
+    for (size_t i=0; i<kMaxSession; i++) {
+        _session_fds[i] = -1;
+    }
+
+	// drop work entries onto the free list
+	for (unsigned i = 0; i < kRequestQueueSize; i++) {
+		_qFree(&_workBufs[i]);
+	}
+
+}
+
+void
+MavlinkFTP::handle_message(Mavlink* mavlink, mavlink_message_t *msg)
+{
+	// get a free request
+	auto req = _dqFree();
+
+	// if we couldn't get a request slot, just drop it
+	if (req != nullptr) {
+
+		// decode the request
+		if (req->decode(mavlink, msg)) {
+
+			// and queue it for the worker
+			work_queue(LPWORK, &req->work, &MavlinkFTP::_workerTrampoline, req, 0);
+		} else {
+			_qFree(req);
+		}
+	}
+}
+
+void
+MavlinkFTP::_workerTrampoline(void *arg)
+{
+	auto req = reinterpret_cast<Request *>(arg);
+	auto server = MavlinkFTP::getServer();
+
+	// call the server worker with the work item
+	server->_worker(req);
+}
+
+void
+MavlinkFTP::_worker(Request *req)
+{
+	auto hdr = req->header();
+	ErrorCode errorCode = kErrNone;
+	uint32_t messageCRC;
+
+	// basic sanity checks; must validate length before use
+	if ((hdr->magic != kProtocolMagic) || (hdr->size > kMaxDataLength)) {
+		errorCode = kErrNoRequest;
+		goto out;
+	}
+
+	// check request CRC to make sure this is one of ours
+	messageCRC = hdr->crc32;
+	hdr->crc32 = 0;
+	if (crc32(req->rawData(), req->dataSize()) != messageCRC) {
+		errorCode = kErrNoRequest;
+		goto out;
+		printf("ftp: bad crc\n");
+	}
+
+	printf("ftp: channel %u opc %u size %u offset %u\n", req->channel(), hdr->opcode, hdr->size, hdr->offset);
+
+	switch (hdr->opcode) {
+	case kCmdNone:
+		break;
+
+	case kCmdTerminate:
+		errorCode = _workTerminate(req);
+		break;
+
+	case kCmdReset:
+		errorCode = _workReset();
+		break;
+
+	case kCmdList:
+		errorCode = _workList(req);
+		break;
+
+	case kCmdOpen:
+		errorCode = _workOpen(req, false);
+		break;
+
+	case kCmdCreate:
+		errorCode = _workOpen(req, true);
+		break;
+
+	case kCmdRead:
+		errorCode = _workRead(req);
+		break;
+
+	case kCmdWrite:
+		errorCode = _workWrite(req);
+		break;
+
+	case kCmdRemove:
+		errorCode = _workRemove(req);
+		break;
+
+	default:
+		errorCode = kErrNoRequest;
+		break;	
+	}
+
+out:
+	// handle success vs. error
+	if (errorCode == kErrNone) {
+		hdr->opcode = kRspAck;
+		printf("FTP: ack\n");
+	} else {
+		printf("FTP: nak %u\n", errorCode);
+		hdr->opcode = kRspNak;
+		hdr->size = 1;
+		hdr->data[0] = errorCode;
+	}
+
+	// respond to the request
+	_reply(req);
+
+	// free the request buffer back to the freelist
+	_qFree(req);
+}
+
+void
+MavlinkFTP::_reply(Request *req)
+{
+	auto hdr = req->header();
+
+	// message is assumed to be already constructed in the request buffer, so generate the CRC
+	hdr->crc32 = 0;
+	hdr->crc32 = crc32(req->rawData(), req->dataSize());
+
+	// then pack and send the reply back to the request source
+	req->reply();
+}
+
+MavlinkFTP::ErrorCode
+MavlinkFTP::_workList(Request *req)
+{
+	auto hdr = req->header();
+	DIR *dp = opendir(req->dataAsCString());
+
+	if (dp == nullptr) {
+		printf("FTP: can't open path '%s'\n", req->dataAsCString());
+		return kErrNotDir;
+	}
+
+	ErrorCode errorCode = kErrNone;
+	struct dirent entry, *result = nullptr;
+	unsigned offset = 0;
+
+	// move to the requested offset
+	seekdir(dp, hdr->offset);
+
+	for (;;) {
+		// read the directory entry
+		if (readdir_r(dp, &entry, &result)) {
+			errorCode = kErrIO;
+			break;
+		}
+
+		// no more entries?
+		if (result == nullptr) {
+			if (hdr->offset != 0 && offset == 0) {
+				// User is requesting subsequent dir entries but there were none. This means the user asked
+				// to seek past EOF.
+				errorCode = kErrEOF;
+			}
+			// Otherwise we are just at the last directory entry, so we leave the errorCode at kErrorNone to signal that
+			break;
+		}
+
+		// name too big to fit?
+		if ((strlen(entry.d_name) + offset + 2) > kMaxDataLength) {
+			break;
+		}
+
+		// store the type marker
+		switch (entry.d_type) {
+		case DTYPE_FILE:
+			hdr->data[offset++] = kDirentFile;
+			break;
+		case DTYPE_DIRECTORY:
+			hdr->data[offset++] = kDirentDir;
+			break;
+		default:
+			hdr->data[offset++] = kDirentUnknown;
+			break;
+		}
+
+		// copy the name, which we know will fit
+		strcpy((char *)&hdr->data[offset], entry.d_name);
+		offset += strlen(entry.d_name) + 1;
+		printf("FTP: list %s\n", entry.d_name);
+	}
+
+	closedir(dp);
+	hdr->size = offset;
+
+	return errorCode;
+}
+
+MavlinkFTP::ErrorCode
+MavlinkFTP::_workOpen(Request *req, bool create)
+{
+	auto hdr = req->header();
+    
+	int session_index = _findUnusedSession();
+	if (session_index < 0) {
+		return kErrNoSession;
+	}
+
+	int oflag = create ? (O_CREAT | O_EXCL | O_APPEND) : O_RDONLY;
+    
+	int fd = ::open(req->dataAsCString(), oflag);
+	if (fd < 0) {
+		return create ? kErrPerm : kErrNotFile;
+	}
+	_session_fds[session_index] = fd;
+
+	hdr->session = session_index;
+	hdr->size = 0;
+
+	return kErrNone;
+}
+
+MavlinkFTP::ErrorCode
+MavlinkFTP::_workRead(Request *req)
+{
+	auto hdr = req->header();
+
+	int session_index = hdr->session;
+
+	if (!_validSession(session_index)) {
+		return kErrNoSession;
+	}
+
+	// Seek to the specified position
+	printf("Seek %d\n", hdr->offset);
+	if (lseek(_session_fds[session_index], hdr->offset, SEEK_SET) < 0) {
+		// Unable to see to the specified location
+		return kErrEOF;
+	}
+
+	int bytes_read = ::read(_session_fds[session_index], &hdr->data[0], kMaxDataLength);
+	if (bytes_read < 0) {
+		// Negative return indicates error other than eof
+		return kErrIO;
+	}
+
+	printf("Read success %d\n", bytes_read);
+	hdr->size = bytes_read;
+
+	return kErrNone;
+}
+
+MavlinkFTP::ErrorCode
+MavlinkFTP::_workWrite(Request *req)
+{
+#if 0
+    // NYI: Coming soon
+	auto hdr = req->header();
+
+	// look up session
+	auto session = getSession(hdr->session);
+	if (session == nullptr) {
+		return kErrNoSession;
+	}
+
+	// append to file
+	int result = session->append(hdr->offset, &hdr->data[0], hdr->size);
+
+	if (result < 0) {
+		// XXX might also be no space, I/O, etc.
+		return kErrNotAppend;
+	}
+
+	hdr->size = result;
+	return kErrNone;
+#else
+	return kErrPerm;
+#endif
+}
+
+MavlinkFTP::ErrorCode
+MavlinkFTP::_workRemove(Request *req)
+{
+	auto hdr = req->header();
+
+	// for now, send error reply
+	return kErrPerm;
+}
+
+MavlinkFTP::ErrorCode
+MavlinkFTP::_workTerminate(Request *req)
+{
+	auto hdr = req->header();
+    
+	if (!_validSession(hdr->session)) {
+		return kErrNoSession;
+	}
+    
+	::close(_session_fds[hdr->session]);
+
+	return kErrNone;
+}
+
+MavlinkFTP::ErrorCode
+MavlinkFTP::_workReset(void)
+{
+	for (size_t i=0; i<kMaxSession; i++) {
+		if (_session_fds[i] != -1) {
+			::close(_session_fds[i]);
+			_session_fds[i] = -1;
+		}
+	}
+
+	return kErrNone;
+}
+
+bool
+MavlinkFTP::_validSession(unsigned index)
+{
+	if ((index >= kMaxSession) || (_session_fds[index] < 0)) {
+		return false;
+	}
+	return true;
+}
+
+int
+MavlinkFTP::_findUnusedSession(void)
+{
+	for (size_t i=0; i<kMaxSession; i++) {
+		if (_session_fds[i] == -1) {
+			return i;
+		}
+	}
+
+	return -1;
+}
+
+char *
+MavlinkFTP::Request::dataAsCString()
+{
+	// guarantee nul termination
+	if (header()->size < kMaxDataLength) {
+		requestData()[header()->size] = '\0';
+	} else {
+		requestData()[kMaxDataLength - 1] = '\0';
+	}
+
+	// and return data
+	return (char *)&(header()->data[0]);
+}
diff --git a/src/modules/mavlink/mavlink_ftp.h b/src/modules/mavlink/mavlink_ftp.h
new file mode 100644
index 000000000..e22e61553
--- /dev/null
+++ b/src/modules/mavlink/mavlink_ftp.h
@@ -0,0 +1,226 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#pragma once
+
+/**
+ * @file mavlink_ftp.h
+ *
+ * MAVLink remote file server.
+ *
+ * Messages are wrapped in ENCAPSULATED_DATA messages. Every message includes
+ * a session ID and sequence number.
+ *
+ * A limited number of requests (currently 2) may be outstanding at a time.
+ * Additional messages will be discarded.
+ *
+ * Messages consist of a fixed header, followed by a data area.
+ *
+ */
+ 
+#include <dirent.h>
+#include <queue.h>
+
+#include <nuttx/wqueue.h>
+#include <systemlib/err.h>
+
+#include "mavlink_messages.h"
+
+class MavlinkFTP
+{
+public:
+	MavlinkFTP();
+
+	static MavlinkFTP	*getServer();
+
+	// static interface
+	void			handle_message(Mavlink* mavlink,
+					mavlink_message_t *msg);
+
+private:
+
+	static const unsigned	kRequestQueueSize = 2;
+
+	static MavlinkFTP	*_server;
+
+	struct RequestHeader
+	{
+		uint8_t		magic;
+		uint8_t		session;
+		uint8_t		opcode;
+		uint8_t		size;
+		uint32_t	crc32;
+		uint32_t	offset;
+		uint8_t		data[];
+	};
+
+	enum Opcode : uint8_t
+	{
+		kCmdNone,	// ignored, always acked
+		kCmdTerminate,	// releases sessionID, closes file
+		kCmdReset,	// terminates all sessions
+		kCmdList,	// list files in <path> from <offset>
+		kCmdOpen,	// opens <path> for reading, returns <session>
+		kCmdRead,	// reads <size> bytes from <offset> in <session>
+		kCmdCreate,	// creates <path> for writing, returns <session>
+		kCmdWrite,	// appends <size> bytes at <offset> in <session>
+		kCmdRemove,	// remove file (only if created by server?)
+
+		kRspAck,
+		kRspNak
+	};
+
+	enum ErrorCode : uint8_t
+	{
+		kErrNone,
+		kErrNoRequest,
+		kErrNoSession,
+		kErrSequence,
+		kErrNotDir,
+		kErrNotFile,
+		kErrEOF,
+		kErrNotAppend,
+		kErrTooBig,
+		kErrIO,
+		kErrPerm
+	};
+
+    int _findUnusedSession(void);
+    bool _validSession(unsigned index);
+
+    static const unsigned kMaxSession = 2;
+    int	_session_fds[kMaxSession];
+
+	class Request
+	{
+	public:
+		union {
+			dq_entry_t	entry;
+			work_s		work;
+		};
+
+		bool		decode(Mavlink *mavlink, mavlink_message_t *fromMessage) {
+			if (fromMessage->msgid == MAVLINK_MSG_ID_ENCAPSULATED_DATA) {
+				_mavlink = mavlink;
+				mavlink_msg_encapsulated_data_decode(fromMessage, &_message);
+				return true;
+			}
+			return false;
+		}
+
+		void		reply() {
+
+			// XXX the proper way would be an IOCTL / uORB call, rather than exploiting the
+			// flat memory architecture, as we're operating between threads here.
+			mavlink_message_t msg;
+			msg.checksum = 0;
+			unsigned len = mavlink_msg_encapsulated_data_pack_chan(_mavlink->get_system_id(), _mavlink->get_component_id(),
+				_mavlink->get_channel(), &msg, sequence(), rawData());
+
+            _mavlink->lockMessageBufferMutex();
+            bool fError = _mavlink->message_buffer_write(&msg, len);
+            _mavlink->unlockMessageBufferMutex();
+            
+            if (!fError) {
+				warnx("FTP TX ERR");
+			} else {
+				warnx("wrote: sys: %d, comp: %d, chan: %d, len: %d, checksum: %d",
+					_mavlink->get_system_id(),
+					_mavlink->get_component_id(),
+					_mavlink->get_channel(),
+					len,
+					msg.checksum);
+			}
+		}
+
+		uint8_t		*rawData() { return &_message.data[0]; }
+		RequestHeader 	*header()  { return reinterpret_cast<RequestHeader *>(&_message.data[0]); }
+		uint8_t         *requestData() { return &(header()->data[0]); }
+		unsigned	dataSize() { return header()->size + sizeof(RequestHeader); }
+		uint16_t	sequence() const { return _message.seqnr; }
+		mavlink_channel_t channel() { return _mavlink->get_channel(); }
+
+		char		*dataAsCString();
+
+	private:
+		Mavlink			*_mavlink;
+		mavlink_encapsulated_data_t _message;
+
+	};
+
+	static const uint8_t	kProtocolMagic = 'f';
+	static const char	kDirentFile = 'F';
+	static const char	kDirentDir = 'D';
+	static const char	kDirentUnknown = 'U';
+	static const uint8_t	kMaxDataLength = MAVLINK_MSG_ENCAPSULATED_DATA_FIELD_DATA_LEN - sizeof(RequestHeader);
+
+	/// Request worker; runs on the low-priority work queue to service
+	/// remote requests.
+	///
+	static void		_workerTrampoline(void *arg);
+	void			_worker(Request *req);
+
+	/// Reply to a request (XXX should be a Request method)
+	///
+	void			_reply(Request *req);
+
+	ErrorCode		_workList(Request *req);
+	ErrorCode		_workOpen(Request *req, bool create);
+	ErrorCode		_workRead(Request *req);
+	ErrorCode		_workWrite(Request *req);
+	ErrorCode		_workRemove(Request *req);
+	ErrorCode		_workTerminate(Request *req);
+	ErrorCode		_workReset();
+
+	// work freelist
+	Request			_workBufs[kRequestQueueSize];
+	dq_queue_t		_workFree;
+	sem_t			_lock;
+
+	void			_qLock() { do {} while (sem_wait(&_lock) != 0); }
+	void			_qUnlock() { sem_post(&_lock); }
+
+	void			_qFree(Request *req) {
+		_qLock();
+		dq_addlast(&req->entry, &_workFree);
+		_qUnlock();
+	}
+
+	Request			*_dqFree() {
+		_qLock();
+		auto req = reinterpret_cast<Request *>(dq_remfirst(&_workFree));
+		_qUnlock();
+		return req;
+	}
+    
+};
diff --git a/src/modules/mavlink/mavlink_main.cpp b/src/modules/mavlink/mavlink_main.cpp
index 18df577fe..026a4d6c9 100644
--- a/src/modules/mavlink/mavlink_main.cpp
+++ b/src/modules/mavlink/mavlink_main.cpp
@@ -81,6 +81,11 @@
 #include "mavlink_messages.h"
 #include "mavlink_receiver.h"
 #include "mavlink_rate_limiter.h"
+#include "mavlink_commands.h"
+
+#ifndef MAVLINK_CRC_EXTRA
+ #error MAVLINK_CRC_EXTRA has to be defined on PX4 systems
+#endif
 
 /* oddly, ERROR is not defined for c++ */
 #ifdef ERROR
@@ -104,7 +109,8 @@ static struct file_operations fops;
  */
 extern "C" __EXPORT int mavlink_main(int argc, char *argv[]);
 
-static uint64_t last_write_times[6] = {0};
+static uint64_t last_write_success_times[6] = {0};
+static uint64_t last_write_try_times[6] = {0};
 
 /*
  * Internal function to send the bytes through the right serial port
@@ -112,6 +118,7 @@ static uint64_t last_write_times[6] = {0};
 void
 mavlink_send_uart_bytes(mavlink_channel_t channel, const uint8_t *ch, int length)
 {
+
 	Mavlink *instance;
 
 	switch (channel) {
@@ -148,10 +155,7 @@ mavlink_send_uart_bytes(mavlink_channel_t channel, const uint8_t *ch, int length
 		instance = Mavlink::get_instance(6);
 		break;
 #endif
-	}
-
-	/* no valid instance, bail */
-	if (!instance) {
+		default:
 		return;
 	}
 
@@ -166,54 +170,88 @@ mavlink_send_uart_bytes(mavlink_channel_t channel, const uint8_t *ch, int length
 	int buf_free = 0;
 
 	if (instance->get_flow_control_enabled()
-	    && ioctl(uart, FIONWRITE, (unsigned long)&buf_free) == 0) {
+		&& ioctl(uart, FIONWRITE, (unsigned long)&buf_free) == 0) {
 
-		if (buf_free == 0) {
+		/* Disable hardware flow control:
+		 * if no successful write since a defined time
+		 * and if the last try was not the last successful write
+		 */
+		if (last_write_try_times[(unsigned)channel] != 0 &&
+			hrt_elapsed_time(&last_write_success_times[(unsigned)channel]) > 500 * 1000UL &&
+			last_write_success_times[(unsigned)channel] !=
+			last_write_try_times[(unsigned)channel])
+		{
+			warnx("DISABLING HARDWARE FLOW CONTROL");
+			instance->enable_flow_control(false);
+		}
+
+	}
+
+	/* If the wait until transmit flag is on, only transmit after we've received messages.
+	   Otherwise, transmit all the time. */
+	if (instance->should_transmit()) {
+		last_write_try_times[(unsigned)channel] = hrt_absolute_time();
 
-			if (last_write_times[(unsigned)channel] != 0 &&
-			    hrt_elapsed_time(&last_write_times[(unsigned)channel]) > 500 * 1000UL) {
+		/* check if there is space in the buffer, let it overflow else */
+		if (!ioctl(uart, FIONWRITE, (unsigned long)&buf_free)) {
 
-				warnx("DISABLING HARDWARE FLOW CONTROL");
-				instance->enable_flow_control(false);
+			if (buf_free < desired) {
+				/* we don't want to send anything just in half, so return */
+				instance->count_txerr();
+				return;
 			}
+		}
 
+		ssize_t ret = write(uart, ch, desired);
+		if (ret != desired) {
+			instance->count_txerr();
 		} else {
-
-			/* apparently there is space left, although we might be
-			 * partially overflooding the buffer already */
-			last_write_times[(unsigned)channel] = hrt_absolute_time();
+			last_write_success_times[(unsigned)channel] = last_write_try_times[(unsigned)channel];
 		}
 	}
 
-	ssize_t ret = write(uart, ch, desired);
 
-	if (ret != desired) {
-		// XXX do something here, but change to using FIONWRITE and OS buf size for detection
-	}
 
 }
 
 static void usage(void);
 
 Mavlink::Mavlink() :
-	next(nullptr),
 	_device_name(DEFAULT_DEVICE_NAME),
 	_task_should_exit(false),
+	next(nullptr),
 	_mavlink_fd(-1),
 	_task_running(false),
 	_hil_enabled(false),
+	_use_hil_gps(false),
 	_is_usb_uart(false),
+	_wait_to_transmit(false),
+	_received_messages(false),
 	_main_loop_delay(1000),
 	_subscriptions(nullptr),
 	_streams(nullptr),
 	_mission_pub(-1),
+	_mode(MAVLINK_MODE_NORMAL),
+	_total_counter(0),
+	_verbose(false),
+	_forwarding_on(false),
+	_passing_on(false),
+	_ftp_on(false),
+	_uart_fd(-1),
 	_mavlink_param_queue_index(0),
 	_subscribe_to_stream(nullptr),
 	_subscribe_to_stream_rate(0.0f),
 	_flow_control_enabled(true),
+	_message_buffer({}),
+	_param_initialized(false),
+	_param_system_id(0),
+	_param_component_id(0),
+	_param_system_type(0),
+	_param_use_hil_gps(0),
 
 /* performance counters */
-	_loop_perf(perf_alloc(PC_ELAPSED, "mavlink"))
+	_loop_perf(perf_alloc(PC_ELAPSED, "mavlink_el")),
+	_txerr_perf(perf_alloc(PC_COUNT, "mavlink_txe"))
 {
 	_wpm = &_wpm_s;
 	mission.count = 0;
@@ -261,12 +299,12 @@ Mavlink::Mavlink() :
 		errx(1, "instance ID is out of range");
 		break;
 	}
-
 }
 
 Mavlink::~Mavlink()
 {
 	perf_free(_loop_perf);
+	perf_free(_txerr_perf);
 
 	if (_task_running) {
 		/* task wakes up every 10ms or so at the longest */
@@ -292,6 +330,12 @@ Mavlink::~Mavlink()
 }
 
 void
+Mavlink::count_txerr()
+{
+	perf_count(_txerr_perf);
+}
+
+void
 Mavlink::set_mode(enum MAVLINK_MODE mode)
 {
 	_mode = mode;
@@ -394,6 +438,18 @@ Mavlink::instance_exists(const char *device_name, Mavlink *self)
 	return false;
 }
 
+void
+Mavlink::forward_message(mavlink_message_t *msg, Mavlink *self)
+{
+
+	Mavlink *inst;
+	LL_FOREACH(_mavlink_instances, inst) {
+		if (inst != self) {
+			inst->pass_message(msg);
+		}
+	}
+}
+
 int
 Mavlink::get_uart_fd(unsigned index)
 {
@@ -459,39 +515,51 @@ Mavlink::mavlink_dev_ioctl(struct file *filep, int cmd, unsigned long arg)
 
 void Mavlink::mavlink_update_system(void)
 {
-	static bool initialized = false;
-	static param_t param_system_id;
-	static param_t param_component_id;
-	static param_t param_system_type;
 
-	if (!initialized) {
-		param_system_id = param_find("MAV_SYS_ID");
-		param_component_id = param_find("MAV_COMP_ID");
-		param_system_type = param_find("MAV_TYPE");
-		initialized = true;
+	if (!_param_initialized) {
+		_param_system_id = param_find("MAV_SYS_ID");
+		_param_component_id = param_find("MAV_COMP_ID");
+		_param_system_type = param_find("MAV_TYPE");
+		_param_use_hil_gps = param_find("MAV_USEHILGPS");
+		_param_initialized = true;
 	}
 
 	/* update system and component id */
 	int32_t system_id;
-	param_get(param_system_id, &system_id);
+	param_get(_param_system_id, &system_id);
 
 	if (system_id > 0 && system_id < 255) {
 		mavlink_system.sysid = system_id;
 	}
 
 	int32_t component_id;
-	param_get(param_component_id, &component_id);
+	param_get(_param_component_id, &component_id);
 
 	if (component_id > 0 && component_id < 255) {
 		mavlink_system.compid = component_id;
 	}
 
 	int32_t system_type;
-	param_get(param_system_type, &system_type);
+	param_get(_param_system_type, &system_type);
 
 	if (system_type >= 0 && system_type < MAV_TYPE_ENUM_END) {
 		mavlink_system.type = system_type;
 	}
+
+	int32_t use_hil_gps;
+	param_get(_param_use_hil_gps, &use_hil_gps);
+
+	_use_hil_gps = (bool)use_hil_gps;
+}
+
+int Mavlink::get_system_id()
+{
+	return mavlink_system.sysid;
+}
+
+int Mavlink::get_component_id()
+{
+	return mavlink_system.compid;
 }
 
 int Mavlink::mavlink_open_uart(int baud, const char *uart_name, struct termios *uart_config_original, bool *is_usb)
@@ -550,6 +618,11 @@ int Mavlink::mavlink_open_uart(int baud, const char *uart_name, struct termios *
 	/* open uart */
 	_uart_fd = open(uart_name, O_RDWR | O_NOCTTY);
 
+	if (_uart_fd < 0) {
+		return _uart_fd;
+	}
+
+
 	/* Try to set baud rate */
 	struct termios uart_config;
 	int termios_state;
@@ -690,9 +763,9 @@ int Mavlink::mavlink_pm_send_param(param_t param)
 	if (param == PARAM_INVALID) { return 1; }
 
 	/* buffers for param transmission */
-	static char name_buf[MAVLINK_MSG_PARAM_VALUE_FIELD_PARAM_ID_LEN];
+	char name_buf[MAVLINK_MSG_PARAM_VALUE_FIELD_PARAM_ID_LEN];
 	float val_buf;
-	static mavlink_message_t tx_msg;
+	mavlink_message_t tx_msg;
 
 	/* query parameter type */
 	param_type_t type = param_type(param);
@@ -743,9 +816,14 @@ void Mavlink::mavlink_pm_message_handler(const mavlink_channel_t chan, const mav
 {
 	switch (msg->msgid) {
 	case MAVLINK_MSG_ID_PARAM_REQUEST_LIST: {
-			/* Start sending parameters */
-			mavlink_pm_start_queued_send();
-			mavlink_missionlib_send_gcs_string("[mavlink pm] sending list");
+			mavlink_param_request_list_t req;
+			mavlink_msg_param_request_list_decode(msg, &req);
+			if (req.target_system == mavlink_system.sysid &&
+					(req.target_component == mavlink_system.compid || req.target_component == MAV_COMP_ID_ALL)) {
+				/* Start sending parameters */
+				mavlink_pm_start_queued_send();
+				mavlink_missionlib_send_gcs_string("[mavlink pm] sending list");
+			}
 		} break;
 
 	case MAVLINK_MSG_ID_PARAM_SET: {
@@ -767,7 +845,7 @@ void Mavlink::mavlink_pm_message_handler(const mavlink_channel_t chan, const mav
 
 					if (param == PARAM_INVALID) {
 						char buf[MAVLINK_MSG_STATUSTEXT_FIELD_TEXT_LEN];
-						sprintf(buf, "[mavlink pm] unknown: %s", name);
+						sprintf(buf, "[pm] unknown: %s", name);
 						mavlink_missionlib_send_gcs_string(buf);
 
 					} else {
@@ -808,10 +886,10 @@ void Mavlink::publish_mission()
 {
 	/* Initialize mission publication if necessary */
 	if (_mission_pub < 0) {
-		_mission_pub = orb_advertise(ORB_ID(mission), &mission);
+		_mission_pub = orb_advertise(ORB_ID(offboard_mission), &mission);
 
 	} else {
-		orb_publish(ORB_ID(mission), _mission_pub, &mission);
+		orb_publish(ORB_ID(offboard_mission), _mission_pub, &mission);
 	}
 }
 
@@ -844,11 +922,16 @@ int Mavlink::map_mavlink_mission_item_to_mission_item(const mavlink_mission_item
 
 	switch (mavlink_mission_item->command) {
 	case MAV_CMD_NAV_TAKEOFF:
-		mission_item->pitch_min = mavlink_mission_item->param2;
+		mission_item->pitch_min = mavlink_mission_item->param1;
+		break;
+	case MAV_CMD_DO_JUMP:
+		mission_item->do_jump_mission_index = mavlink_mission_item->param1;
+		mission_item->do_jump_current_count = 0;
+		mission_item->do_jump_repeat_count = mavlink_mission_item->param2;
 		break;
-
 	default:
 		mission_item->acceptance_radius = mavlink_mission_item->param2;
+		mission_item->time_inside = mavlink_mission_item->param1;
 		break;
 	}
 
@@ -857,11 +940,13 @@ int Mavlink::map_mavlink_mission_item_to_mission_item(const mavlink_mission_item
 	mission_item->loiter_direction = (mavlink_mission_item->param3 > 0) ? 1 : -1; /* 1 if positive CW, -1 if negative CCW */
 	mission_item->nav_cmd = (NAV_CMD)mavlink_mission_item->command;
 
-	mission_item->time_inside = mavlink_mission_item->param1;
 	mission_item->autocontinue = mavlink_mission_item->autocontinue;
 	// mission_item->index = mavlink_mission_item->seq;
 	mission_item->origin = ORIGIN_MAVLINK;
 
+	/* reset DO_JUMP count */
+	mission_item->do_jump_current_count = 0;
+
 	return OK;
 }
 
@@ -876,11 +961,17 @@ int Mavlink::map_mission_item_to_mavlink_mission_item(const struct mission_item_
 
 	switch (mission_item->nav_cmd) {
 	case NAV_CMD_TAKEOFF:
-		mavlink_mission_item->param2 = mission_item->pitch_min;
+		mavlink_mission_item->param1 = mission_item->pitch_min;
+		break;
+
+	case NAV_CMD_DO_JUMP:
+		mavlink_mission_item->param1 = mission_item->do_jump_mission_index;
+		mavlink_mission_item->param2 = mission_item->do_jump_repeat_count;
 		break;
 
 	default:
 		mavlink_mission_item->param2 = mission_item->acceptance_radius;
+		mavlink_mission_item->param1 = mission_item->time_inside;
 		break;
 	}
 
@@ -891,7 +982,6 @@ int Mavlink::map_mission_item_to_mavlink_mission_item(const struct mission_item_
 	mavlink_mission_item->param4 = mission_item->yaw * M_RAD_TO_DEG_F;
 	mavlink_mission_item->param3 = mission_item->loiter_radius * (float)mission_item->loiter_direction;
 	mavlink_mission_item->command = mission_item->nav_cmd;
-	mavlink_mission_item->param1 = mission_item->time_inside;
 	mavlink_mission_item->autocontinue = mission_item->autocontinue;
 	// mavlink_mission_item->seq = mission_item->index;
 
@@ -907,6 +997,7 @@ void Mavlink::mavlink_wpm_init(mavlink_wpm_storage *state)
 	state->current_partner_compid = 0;
 	state->timestamp_lastaction = 0;
 	state->timestamp_last_send_setpoint = 0;
+	state->timestamp_last_send_request = 0;
 	state->timeout = MAVLINK_WPM_PROTOCOL_TIMEOUT_DEFAULT;
 	state->current_dataman_id = 0;
 }
@@ -955,8 +1046,6 @@ void Mavlink::mavlink_wpm_send_waypoint_current(uint16_t seq)
 
 	} else {
 		mavlink_missionlib_send_gcs_string("ERROR: wp index out of bounds");
-
-		if (_verbose) { warnx("ERROR: index out of bounds"); }
 	}
 }
 
@@ -1007,6 +1096,7 @@ void Mavlink::mavlink_wpm_send_waypoint(uint8_t sysid, uint8_t compid, uint16_t
 
 	} else {
 		mavlink_wpm_send_waypoint_ack(_wpm->current_partner_sysid, _wpm->current_partner_compid, MAV_MISSION_ERROR);
+		mavlink_missionlib_send_gcs_string("#audio: Unable to read from micro SD");
 
 		if (_verbose) { warnx("ERROR: could not read WP%u", seq); }
 	}
@@ -1022,13 +1112,12 @@ void Mavlink::mavlink_wpm_send_waypoint_request(uint8_t sysid, uint8_t compid, u
 		wpr.seq = seq;
 		mavlink_msg_mission_request_encode_chan(mavlink_system.sysid, _mavlink_wpm_comp_id, _channel, &msg, &wpr);
 		mavlink_missionlib_send_message(&msg);
+		_wpm->timestamp_last_send_request = hrt_absolute_time();
 
 		if (_verbose) { warnx("Sent waypoint request %u to ID %u", wpr.seq, wpr.target_system); }
 
 	} else {
 		mavlink_missionlib_send_gcs_string("ERROR: Waypoint index exceeds list capacity");
-
-		if (_verbose) { warnx("ERROR: Waypoint index exceeds list capacity"); }
 	}
 }
 
@@ -1059,11 +1148,13 @@ void Mavlink::mavlink_waypoint_eventloop(uint64_t now)
 
 		mavlink_missionlib_send_gcs_string("Operation timeout");
 
-		if (_verbose) { warnx("Last operation (state=%u) timed out, changing state to MAVLINK_WPM_STATE_IDLE", _wpm->current_state); }
-
 		_wpm->current_state = MAVLINK_WPM_STATE_IDLE;
 		_wpm->current_partner_sysid = 0;
 		_wpm->current_partner_compid = 0;
+
+	} else if (now - _wpm->timestamp_last_send_request > 500000 && _wpm->current_state == MAVLINK_WPM_STATE_GETLIST_GETWPS) {
+		/* try to get WP again after short timeout */
+		mavlink_wpm_send_waypoint_request(_wpm->current_partner_sysid, _wpm->current_partner_compid, _wpm->current_wp_id);
 	}
 }
 
@@ -1091,8 +1182,6 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 			} else {
 				mavlink_missionlib_send_gcs_string("REJ. WP CMD: curr partner id mismatch");
-
-				if (_verbose) { warnx("REJ. WP CMD: curr partner id mismatch"); }
 			}
 
 			break;
@@ -1116,21 +1205,11 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 					} else {
 						mavlink_missionlib_send_gcs_string("IGN WP CURR CMD: Not in list");
-
-						if (_verbose) { warnx("IGN WP CURR CMD: Not in list"); }
 					}
 
 				} else {
 					mavlink_missionlib_send_gcs_string("IGN WP CURR CMD: Busy");
-
-					if (_verbose) { warnx("IGN WP CURR CMD: Busy"); }
-
 				}
-
-			} else {
-				mavlink_missionlib_send_gcs_string("REJ. WP CMD: target id mismatch");
-
-				if (_verbose) { warnx("REJ. WP CMD: target id mismatch"); }
 			}
 
 			break;
@@ -1160,14 +1239,7 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 				} else {
 					mavlink_missionlib_send_gcs_string("IGN REQUEST LIST: Busy");
-
-					if (_verbose) { warnx("IGN REQUEST LIST: Busy"); }
 				}
-
-			} else {
-				mavlink_missionlib_send_gcs_string("REJ. REQUEST LIST: target id mismatch");
-
-				if (_verbose) { warnx("REJ. REQUEST LIST: target id mismatch"); }
 			}
 
 			break;
@@ -1184,8 +1256,6 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 					mavlink_missionlib_send_gcs_string("REJ. WP CMD: Req. WP not in list");
 
-					if (_verbose) { warnx("Ignored MAVLINK_MSG_ID_MISSION_ITEM_REQUEST because the requested waypoint ID (%u) was out of bounds.", wpr.seq); }
-
 					break;
 				}
 
@@ -1196,15 +1266,13 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 				if (_wpm->current_state == MAVLINK_WPM_STATE_SENDLIST) {
 
 					if (wpr.seq == 0) {
-						if (_verbose) { warnx("Got MAVLINK_MSG_ID_MISSION_ITEM_REQUEST of waypoint %u from %u changing state to MAVLINK_WPM_STATE_SENDLIST_SENDWPS", wpr.seq, msg->sysid); }
+						if (_verbose) { warnx("Got ITEM_REQUEST of waypoint %u from %u changing to STATE_SENDLIST_SENDWPS", wpr.seq, msg->sysid); }
 
 						_wpm->current_state = MAVLINK_WPM_STATE_SENDLIST_SENDWPS;
 
 					} else {
 						mavlink_missionlib_send_gcs_string("REJ. WP CMD: First id != 0");
 
-						if (_verbose) { warnx("REJ. WP CMD: First id != 0"); }
-
 						break;
 					}
 
@@ -1212,17 +1280,15 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 					if (wpr.seq == _wpm->current_wp_id) {
 
-						if (_verbose) { warnx("Got MAVLINK_MSG_ID_MISSION_ITEM_REQUEST of waypoint %u (again) from %u staying in state MAVLINK_WPM_STATE_SENDLIST_SENDWPS", wpr.seq, msg->sysid); }
+						if (_verbose) { warnx("Got ITEM_REQUEST of waypoint %u (again) from %u staying in STATE_SENDLIST_SENDWPS", wpr.seq, msg->sysid); }
 
 					} else if (wpr.seq == _wpm->current_wp_id + 1) {
 
-						if (_verbose) { warnx("Got MAVLINK_MSG_ID_MISSION_ITEM_REQUEST of waypoint %u from %u staying in state MAVLINK_WPM_STATE_SENDLIST_SENDWPS", wpr.seq, msg->sysid); }
+						if (_verbose) { warnx("Got ITEM_REQUEST of waypoint %u from %u staying in STATE_SENDLIST_SENDWPS", wpr.seq, msg->sysid); }
 
 					} else {
 						mavlink_missionlib_send_gcs_string("REJ. WP CMD: Req. WP was unexpected");
 
-						if (_verbose) { warnx("Ignored MAVLINK_MSG_ID_MISSION_ITEM_REQUEST because the requested waypoint ID (%u) was not the expected (%u or %u).", wpr.seq, _wpm->current_wp_id, _wpm->current_wp_id + 1); }
-
 						break;
 					}
 
@@ -1230,8 +1296,6 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 					mavlink_missionlib_send_gcs_string("REJ. WP CMD: Busy");
 
-					if (_verbose) { warnx("Ignored MAVLINK_MSG_ID_MISSION_ITEM_REQUEST because i'm doing something else already (state=%i).", _wpm->current_state); }
-
 					break;
 				}
 
@@ -1245,7 +1309,7 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 				} else {
 					mavlink_wpm_send_waypoint_ack(_wpm->current_partner_sysid, _wpm->current_partner_compid, MAV_MISSION_ERROR);
 
-					if (_verbose) { warnx("ERROR: Waypoint %u out of bounds", wpr.seq); }
+					mavlink_missionlib_send_gcs_string("ERROR: Waypoint out of bounds");
 				}
 
 
@@ -1256,12 +1320,6 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 					mavlink_missionlib_send_gcs_string("REJ. WP CMD: Busy");
 
 					if (_verbose) { warnx("Ignored MAVLINK_MSG_ID_MISSION_ITEM_REQUEST from ID %u because i'm already talking to ID %u.", msg->sysid, _wpm->current_partner_sysid); }
-
-				} else {
-
-					mavlink_missionlib_send_gcs_string("REJ. WP CMD: target id mismatch");
-
-					if (_verbose) { warnx("IGNORED WAYPOINT COMMAND BECAUSE TARGET SYSTEM AND COMPONENT OR COMM PARTNER ID MISMATCH"); }
 				}
 			}
 
@@ -1285,15 +1343,11 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 					}
 
 					if (wpc.count == 0) {
-						mavlink_missionlib_send_gcs_string("COUNT 0");
-
-						if (_verbose) { warnx("got waypoint count of 0, clearing waypoint list and staying in state MAVLINK_WPM_STATE_IDLE"); }
+						mavlink_missionlib_send_gcs_string("WP COUNT 0");
 
 						break;
 					}
 
-					if (_verbose) { warnx("Got MAVLINK_MSG_ID_MISSION_ITEM_COUNT (%u) from %u changing state to MAVLINK_WPM_STATE_GETLIST", wpc.count, msg->sysid); }
-
 					_wpm->current_state = MAVLINK_WPM_STATE_GETLIST;
 					_wpm->current_wp_id = 0;
 					_wpm->current_partner_sysid = msg->sysid;
@@ -1307,25 +1361,13 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 					if (_wpm->current_wp_id == 0) {
 						mavlink_missionlib_send_gcs_string("WP CMD OK AGAIN");
 
-						if (_verbose) { warnx("Got MAVLINK_MSG_ID_MISSION_ITEM_COUNT (%u) again from %u", wpc.count, msg->sysid); }
-
 					} else {
-						mavlink_missionlib_send_gcs_string("REJ. WP CMD: Busy");
-
-						if (_verbose) { warnx("Ignored MAVLINK_MSG_ID_MISSION_ITEM_COUNT because i'm already receiving waypoint %u.", _wpm->current_wp_id); }
+						mavlink_missionlib_send_gcs_string("REJ. WP CMD: Busy with WP");
 					}
 
 				} else {
 					mavlink_missionlib_send_gcs_string("IGN MISSION_COUNT CMD: Busy");
-
-					if (_verbose) { warnx("IGN MISSION_COUNT CMD: Busy"); }
 				}
-
-			} else {
-
-				mavlink_missionlib_send_gcs_string("REJ. WP COUNT CMD: target id mismatch");
-
-				if (_verbose) { warnx("IGNORED WAYPOINT COUNT COMMAND BECAUSE TARGET SYSTEM AND COMPONENT OR COMM PARTNER ID MISMATCH"); }
 			}
 		}
 		break;
@@ -1347,7 +1389,6 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 					if (wp.seq != 0) {
 						mavlink_missionlib_send_gcs_string("Ignored MISSION_ITEM WP not 0");
-						warnx("Ignored MAVLINK_MSG_ID_MISSION_ITEM because the first waypoint ID (%u) was not 0.", wp.seq);
 						break;
 					}
 
@@ -1355,12 +1396,11 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 					if (wp.seq >= _wpm->current_count) {
 						mavlink_missionlib_send_gcs_string("Ignored MISSION_ITEM WP out of bounds");
-						warnx("Ignored MAVLINK_MSG_ID_MISSION_ITEM because the waypoint ID (%u) was out of bounds.", wp.seq);
 						break;
 					}
 
 					if (wp.seq != _wpm->current_wp_id) {
-						warnx("Ignored MAVLINK_MSG_ID_MISSION_ITEM because the waypoint ID (%u) was not the expected %u.", wp.seq, _wpm->current_wp_id);
+						mavlink_missionlib_send_gcs_string("IGN: waypoint ID mismatch");
 						mavlink_wpm_send_waypoint_request(_wpm->current_partner_sysid, _wpm->current_partner_compid, _wpm->current_wp_id);
 						break;
 					}
@@ -1393,6 +1433,7 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 				if (dm_write(dm_next, wp.seq, DM_PERSIST_IN_FLIGHT_RESET, &mission_item, len) != len) {
 					mavlink_wpm_send_waypoint_ack(_wpm->current_partner_sysid, _wpm->current_partner_compid, MAV_MISSION_ERROR);
+					mavlink_missionlib_send_gcs_string("#audio: Unable to write on micro SD");
 					_wpm->current_state = MAVLINK_WPM_STATE_IDLE;
 					break;
 				}
@@ -1424,11 +1465,6 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 				} else {
 					mavlink_wpm_send_waypoint_request(_wpm->current_partner_sysid, _wpm->current_partner_compid, _wpm->current_wp_id);
 				}
-
-			} else {
-				mavlink_missionlib_send_gcs_string("REJ. WP CMD: target id mismatch");
-
-				if (_verbose) { warnx("IGNORED WAYPOINT COMMAND BECAUSE TARGET SYSTEM AND COMPONENT OR COMM PARTNER ID MISMATCH"); }
 			}
 
 			break;
@@ -1464,13 +1500,6 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 					if (_verbose) { warnx("IGN WP CLEAR CMD: Busy"); }
 				}
-
-
-			} else if (wpca.target_system == mavlink_system.sysid /*&& wpca.target_component == mavlink_wpm_comp_id */ && _wpm->current_state != MAVLINK_WPM_STATE_IDLE) {
-
-				mavlink_missionlib_send_gcs_string("REJ. WP CLERR CMD: target id mismatch");
-
-				if (_verbose) { warnx("IGNORED WAYPOINT CLEAR COMMAND BECAUSE TARGET SYSTEM AND COMPONENT OR COMM PARTNER ID MISMATCH"); }
 			}
 
 			break;
@@ -1486,9 +1515,10 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 void
 Mavlink::mavlink_missionlib_send_message(mavlink_message_t *msg)
 {
-	uint16_t len = mavlink_msg_to_send_buffer(missionlib_msg_buf, msg);
+	uint8_t buf[MAVLINK_MAX_PACKET_LEN];
 
-	mavlink_send_uart_bytes(_channel, missionlib_msg_buf, len);
+	uint16_t len = mavlink_msg_to_send_buffer(buf, msg);
+	mavlink_send_uart_bytes(_channel, buf, len);
 }
 
 
@@ -1498,6 +1528,8 @@ Mavlink::mavlink_missionlib_send_gcs_string(const char *string)
 {
 	const int len = MAVLINK_MSG_STATUSTEXT_FIELD_TEXT_LEN;
 	mavlink_statustext_t statustext;
+	statustext.severity = MAV_SEVERITY_INFO;
+
 	int i = 0;
 
 	while (i < len - 1) {
@@ -1560,31 +1592,36 @@ Mavlink::configure_stream(const char *stream_name, const float rate)
 				/* delete stream */
 				LL_DELETE(_streams, stream);
 				delete stream;
+				warnx("deleted stream %s", stream->get_name());
 			}
 
 			return OK;
 		}
 	}
 
-	if (interval > 0) {
-		/* search for stream with specified name in supported streams list */
-		for (unsigned int i = 0; streams_list[i] != nullptr; i++) {
-			if (strcmp(stream_name, streams_list[i]->get_name()) == 0) {
-				/* create new instance */
-				stream = streams_list[i]->new_instance();
-				stream->set_channel(get_channel());
-				stream->set_interval(interval);
-				stream->subscribe(this);
-				LL_APPEND(_streams, stream);
-				return OK;
-			}
-		}
-
-	} else {
-		/* stream not found, nothing to disable */
+	if (interval == 0) {
+		/* stream was not active and is requested to be disabled, do nothing */
 		return OK;
 	}
 
+	/* search for stream with specified name in supported streams list */
+	for (unsigned int i = 0; streams_list[i] != nullptr; i++) {
+
+		if (strcmp(stream_name, streams_list[i]->get_name()) == 0) {
+			/* create new instance */
+			stream = streams_list[i]->new_instance();
+			stream->set_channel(get_channel());
+			stream->set_interval(interval);
+			stream->subscribe(this);
+			LL_APPEND(_streams, stream);
+
+			return OK;
+		}
+	}
+
+	/* if we reach here, the stream list does not contain the stream */
+	warnx("stream %s not found", stream_name);
+
 	return ERROR;
 }
 
@@ -1617,6 +1654,135 @@ Mavlink::configure_stream_threadsafe(const char *stream_name, const float rate)
 }
 
 int
+Mavlink::message_buffer_init(int size)
+{
+
+	_message_buffer.size = size;
+	_message_buffer.write_ptr = 0;
+	_message_buffer.read_ptr = 0;
+	_message_buffer.data = (char*)malloc(_message_buffer.size);
+
+	int ret;
+	if (_message_buffer.data == 0) {
+		ret = ERROR;
+		_message_buffer.size = 0;
+	} else {
+		ret = OK;
+	}
+
+	return ret;
+}
+
+void
+Mavlink::message_buffer_destroy()
+{
+	_message_buffer.size = 0;
+	_message_buffer.write_ptr = 0;
+	_message_buffer.read_ptr = 0;
+	free(_message_buffer.data);
+}
+
+int
+Mavlink::message_buffer_count()
+{
+	int n = _message_buffer.write_ptr - _message_buffer.read_ptr;
+
+	if (n < 0) {
+		n += _message_buffer.size;
+	}
+
+	return n;
+}
+
+int
+Mavlink::message_buffer_is_empty()
+{
+	return _message_buffer.read_ptr == _message_buffer.write_ptr;
+}
+
+
+bool
+Mavlink::message_buffer_write(void *ptr, int size)
+{
+	// bytes available to write
+	int available = _message_buffer.read_ptr - _message_buffer.write_ptr - 1;
+
+	if (available < 0) {
+		available += _message_buffer.size;
+	}
+
+	if (size > available) {
+		// buffer overflow
+		return false;
+	}
+
+	char *c = (char *) ptr;
+	int n = _message_buffer.size - _message_buffer.write_ptr;	// bytes to end of the buffer
+
+	if (n < size) {
+		// message goes over end of the buffer
+		memcpy(&(_message_buffer.data[_message_buffer.write_ptr]), c, n);
+		_message_buffer.write_ptr = 0;
+
+	} else {
+		n = 0;
+	}
+
+	// now: n = bytes already written
+	int p = size - n;	// number of bytes to write
+	memcpy(&(_message_buffer.data[_message_buffer.write_ptr]), &(c[n]), p);
+	_message_buffer.write_ptr = (_message_buffer.write_ptr + p) % _message_buffer.size;
+	return true;
+}
+
+int
+Mavlink::message_buffer_get_ptr(void **ptr, bool *is_part)
+{
+	// bytes available to read
+	int available = _message_buffer.write_ptr - _message_buffer.read_ptr;
+
+	if (available == 0) {
+		return 0;	// buffer is empty
+	}
+
+	int n = 0;
+
+	if (available > 0) {
+		// read pointer is before write pointer, all available bytes can be read
+		n = available;
+		*is_part = false;
+
+	} else {
+		// read pointer is after write pointer, read bytes from read_ptr to end of the buffer
+		n = _message_buffer.size - _message_buffer.read_ptr;
+		*is_part = _message_buffer.write_ptr > 0;
+	}
+
+	*ptr = &(_message_buffer.data[_message_buffer.read_ptr]);
+	return n;
+}
+
+void
+Mavlink::message_buffer_mark_read(int n)
+{
+	_message_buffer.read_ptr = (_message_buffer.read_ptr + n) % _message_buffer.size;
+}
+
+void
+Mavlink::pass_message(mavlink_message_t *msg)
+{
+	if (_passing_on) {
+		/* size is 8 bytes plus variable payload */
+		int size = MAVLINK_NUM_NON_PAYLOAD_BYTES + msg->len;
+		pthread_mutex_lock(&_message_buffer_mutex);
+		message_buffer_write(msg, size);
+		pthread_mutex_unlock(&_message_buffer_mutex);
+	}
+}
+
+
+
+int
 Mavlink::task_main(int argc, char *argv[])
 {
 	int ch;
@@ -1632,7 +1798,7 @@ Mavlink::task_main(int argc, char *argv[])
 	 * set error flag instead */
 	bool err_flag = false;
 
-	while ((ch = getopt(argc, argv, "b:r:d:m:v")) != EOF) {
+	while ((ch = getopt(argc, argv, "b:r:d:m:fpvwx")) != EOF) {
 		switch (ch) {
 		case 'b':
 			_baudrate = strtoul(optarg, NULL, 10);
@@ -1672,10 +1838,26 @@ Mavlink::task_main(int argc, char *argv[])
 
 			break;
 
+		case 'f':
+			_forwarding_on = true;
+			break;
+
+		case 'p':
+			_passing_on = true;
+			break;
+
 		case 'v':
 			_verbose = true;
 			break;
 
+		case 'w':
+			_wait_to_transmit = true;
+			break;
+
+		case 'x':
+			_ftp_on = true;
+			break;
+
 		default:
 			err_flag = true;
 			break;
@@ -1740,6 +1922,20 @@ Mavlink::task_main(int argc, char *argv[])
 	/* initialize mavlink text message buffering */
 	mavlink_logbuffer_init(&_logbuffer, 5);
 
+	/* if we are passing on mavlink messages, we need to prepare a buffer for this instance */
+	if (_passing_on || _ftp_on) {
+		/* initialize message buffer if multiplexing is on or its needed for FTP.
+		 * make space for two messages plus off-by-one space as we use the empty element
+		 * marker ring buffer approach.
+		 */
+		if (OK != message_buffer_init(2 * MAVLINK_MAX_PACKET_LEN + 2)) {
+			errx(1, "can't allocate message buffer, exiting");
+		}
+
+		/* initialize message buffer mutex */
+		pthread_mutex_init(&_message_buffer_mutex, NULL);
+	}
+
 	/* create the device node that's used for sending text log messages, etc. */
 	register_driver(MAVLINK_LOG_DEVICE, &fops, 0666, NULL);
 
@@ -1762,9 +1958,14 @@ Mavlink::task_main(int argc, char *argv[])
 	_task_running = true;
 
 	MavlinkOrbSubscription *param_sub = add_orb_subscription(ORB_ID(parameter_update));
+	uint64_t param_time = 0;
 	MavlinkOrbSubscription *status_sub = add_orb_subscription(ORB_ID(vehicle_status));
+	uint64_t status_time = 0;
+
+	struct vehicle_status_s status;
+	status_sub->update(&status_time, &status);
 
-	struct vehicle_status_s *status = (struct vehicle_status_s *) status_sub->get_data();
+	MavlinkCommandsStream commands_stream(this, _channel);
 
 	/* add default streams depending on mode and intervals depending on datarate */
 	float rate_mult = _datarate / 1000.0f;
@@ -1783,6 +1984,9 @@ Mavlink::task_main(int argc, char *argv[])
 		configure_stream("LOCAL_POSITION_NED", 3.0f * rate_mult);
 		configure_stream("RC_CHANNELS_RAW", 1.0f * rate_mult);
 		configure_stream("NAMED_VALUE_FLOAT", 1.0f * rate_mult);
+		configure_stream("GLOBAL_POSITION_SETPOINT_INT", 3.0f * rate_mult);
+		configure_stream("ROLL_PITCH_YAW_THRUST_SETPOINT", 3.0f * rate_mult);
+		configure_stream("DISTANCE_SENSOR", 0.5f);
 		break;
 
 	case MAVLINK_MODE_CAMERA:
@@ -1816,28 +2020,31 @@ Mavlink::task_main(int argc, char *argv[])
 
 		hrt_abstime t = hrt_absolute_time();
 
-		if (param_sub->update(t)) {
+		if (param_sub->update(&param_time, nullptr)) {
 			/* parameters updated */
 			mavlink_update_system();
 		}
 
-		if (status_sub->update(t)) {
+		if (status_sub->update(&status_time, &status)) {
 			/* switch HIL mode if required */
-			set_hil_enabled(status->hil_state == HIL_STATE_ON);
+			set_hil_enabled(status.hil_state == HIL_STATE_ON);
 		}
 
+		/* update commands stream */
+		commands_stream.update(t);
+
 		/* check for requested subscriptions */
 		if (_subscribe_to_stream != nullptr) {
 			if (OK == configure_stream(_subscribe_to_stream, _subscribe_to_stream_rate)) {
 				if (_subscribe_to_stream_rate > 0.0f) {
-					warnx("stream %s on device %s enabled with rate %.1f Hz", _subscribe_to_stream, _device_name, _subscribe_to_stream_rate);
+					warnx("stream %s on device %s enabled with rate %.1f Hz", _subscribe_to_stream, _device_name, (double)_subscribe_to_stream_rate);
 
 				} else {
 					warnx("stream %s on device %s disabled", _subscribe_to_stream, _device_name);
 				}
 
 			} else {
-				warnx("stream %s not found", _subscribe_to_stream, _device_name);
+				warnx("stream %s on device %s not found", _subscribe_to_stream, _device_name);
 			}
 
 			delete _subscribe_to_stream;
@@ -1884,6 +2091,55 @@ Mavlink::task_main(int argc, char *argv[])
 			}
 		}
 
+		/* pass messages from other UARTs or FTP worker */
+		if (_passing_on || _ftp_on) {
+
+			bool is_part;
+			uint8_t *read_ptr;
+            uint8_t *write_ptr;
+
+			pthread_mutex_lock(&_message_buffer_mutex);
+			int available = message_buffer_get_ptr((void**)&read_ptr, &is_part);
+			pthread_mutex_unlock(&_message_buffer_mutex);
+
+			if (available > 0) {
+                // Reconstruct message from buffer
+
+				mavlink_message_t msg;
+                write_ptr = (uint8_t*)&msg;
+
+                // Pull a single message from the buffer
+                size_t read_count = available;
+                if (read_count > sizeof(mavlink_message_t)) {
+                    read_count = sizeof(mavlink_message_t);
+                }
+                
+                memcpy(write_ptr, read_ptr, read_count);
+                
+                // We hold the mutex until after we complete the second part of the buffer. If we don't
+                // we may end up breaking the empty slot overflow detection semantics when we mark the
+                // possibly partial read below.
+                pthread_mutex_lock(&_message_buffer_mutex);
+                
+				message_buffer_mark_read(read_count);
+
+				/* write second part of buffer if there is some */
+				if (is_part && read_count < sizeof(mavlink_message_t)) {
+                    write_ptr += read_count;
+					available = message_buffer_get_ptr((void**)&read_ptr, &is_part);
+                    read_count = sizeof(mavlink_message_t) - read_count;
+                    memcpy(write_ptr, read_ptr, read_count);
+					message_buffer_mark_read(available);
+				}
+                
+                pthread_mutex_unlock(&_message_buffer_mutex);
+
+                _mavlink_resend_uart(_channel, &msg);
+			}
+		}
+
+
+
 		perf_end(_loop_perf);
 	}
 
@@ -1928,6 +2184,10 @@ Mavlink::task_main(int argc, char *argv[])
 	/* close mavlink logging device */
 	close(_mavlink_fd);
 
+	if (_passing_on || _ftp_on) {
+		message_buffer_destroy();
+		pthread_mutex_destroy(&_message_buffer_mutex);
+	}
 	/* destroy log buffer */
 	mavlink_logbuffer_destroy(&_logbuffer);
 
@@ -1942,11 +2202,20 @@ int Mavlink::start_helper(int argc, char *argv[])
 	/* create the instance in task context */
 	Mavlink *instance = new Mavlink();
 
-	/* this will actually only return once MAVLink exits */
-	int res = instance->task_main(argc, argv);
+	int res;
 
-	/* delete instance on main thread end */
-	delete instance;
+	if (!instance) {
+
+		/* out of memory */
+		res = -ENOMEM;
+		warnx("OUT OF MEM");
+	} else {
+		/* this will actually only return once MAVLink exits */
+		res = instance->task_main(argc, argv);
+
+		/* delete instance on main thread end */
+		delete instance;
+	}
 
 	return res;
 }
@@ -1969,7 +2238,7 @@ Mavlink::start(int argc, char *argv[])
 	task_spawn_cmd(buf,
 		       SCHED_DEFAULT,
 		       SCHED_PRIORITY_DEFAULT,
-		       2048,
+		       1950,
 		       (main_t)&Mavlink::start_helper,
 		       (const char **)argv);
 
@@ -1997,18 +2266,17 @@ Mavlink::start(int argc, char *argv[])
 }
 
 void
-Mavlink::status()
+Mavlink::display_status()
 {
 	warnx("running");
 }
 
 int
-Mavlink::stream(int argc, char *argv[])
+Mavlink::stream_command(int argc, char *argv[])
 {
 	const char *device_name = DEFAULT_DEVICE_NAME;
 	float rate = -1.0f;
 	const char *stream_name = nullptr;
-	int ch;
 
 	argc -= 2;
 	argv += 2;
@@ -2045,7 +2313,7 @@ Mavlink::stream(int argc, char *argv[])
 		i++;
 	}
 
-	if (!err_flag && rate >= 0.0 && stream_name != nullptr) {
+	if (!err_flag && rate >= 0.0f && stream_name != nullptr) {
 		Mavlink *inst = get_instance_for_device(device_name);
 
 		if (inst != nullptr) {
@@ -2067,7 +2335,7 @@ Mavlink::stream(int argc, char *argv[])
 
 static void usage()
 {
-	warnx("usage: mavlink {start|stop-all|stream} [-d device] [-b baudrate] [-r rate] [-m mode] [-s stream] [-v]");
+	warnx("usage: mavlink {start|stop-all|stream} [-d device] [-b baudrate]\n\t[-r rate][-m mode] [-s stream] [-f] [-p] [-v] [-w] [-x]");
 }
 
 int mavlink_main(int argc, char *argv[])
@@ -2092,7 +2360,7 @@ int mavlink_main(int argc, char *argv[])
 		// 	mavlink::g_mavlink->status();
 
 	} else if (!strcmp(argv[1], "stream")) {
-		return Mavlink::stream(argc, argv);
+		return Mavlink::stream_command(argc, argv);
 
 	} else {
 		usage();
diff --git a/src/modules/mavlink/mavlink_main.h b/src/modules/mavlink/mavlink_main.h
index 5a118a0ad..f94036a17 100644
--- a/src/modules/mavlink/mavlink_main.h
+++ b/src/modules/mavlink/mavlink_main.h
@@ -93,6 +93,7 @@ struct mavlink_wpm_storage {
 	uint8_t current_partner_compid;
 	uint64_t timestamp_lastaction;
 	uint64_t timestamp_last_send_setpoint;
+	uint64_t timestamp_last_send_request;
 	uint32_t timeout;
 	int current_dataman_id;
 };
@@ -122,25 +123,41 @@ public:
 	/**
 	 * Display the mavlink status.
 	 */
-	void		status();
+	void			display_status();
 
-	static int stream(int argc, char *argv[]);
+	static int		stream_command(int argc, char *argv[]);
 
-	static int	instance_count();
+	static int		instance_count();
 
-	static Mavlink *new_instance();
+	static Mavlink		*new_instance();
 
-	static Mavlink *get_instance(unsigned instance);
+	static Mavlink		*get_instance(unsigned instance);
 
-	static Mavlink *get_instance_for_device(const char *device_name);
+	static Mavlink		*get_instance_for_device(const char *device_name);
 
-	static int	destroy_all_instances();
+	static int		destroy_all_instances();
 
-	static bool	instance_exists(const char *device_name, Mavlink *self);
+	static bool		instance_exists(const char *device_name, Mavlink *self);
 
-	static int get_uart_fd(unsigned index);
+	static void		forward_message(mavlink_message_t *msg, Mavlink *self);
 
-	int get_uart_fd();
+	static int		get_uart_fd(unsigned index);
+
+	int			get_uart_fd();
+
+	/**
+	 * Get the MAVLink system id.
+	 *
+	 * @return		The system ID of this vehicle
+	 */
+	int			get_system_id();
+
+	/**
+	 * Get the MAVLink component id.
+	 *
+	 * @return		The component ID of this vehicle
+	 */
+	int			get_component_id();
 
 	const char *_device_name;
 
@@ -150,26 +167,30 @@ public:
 		MAVLINK_MODE_CAMERA
 	};
 
-	void		set_mode(enum MAVLINK_MODE);
-	enum MAVLINK_MODE		get_mode() { return _mode; }
+	void			set_mode(enum MAVLINK_MODE);
+	enum MAVLINK_MODE	get_mode() { return _mode; }
 
-	bool		get_hil_enabled() { return _hil_enabled; };
+	bool			get_hil_enabled() { return _hil_enabled; }
 
-	bool		get_flow_control_enabled() { return _flow_control_enabled; }
+	bool			get_use_hil_gps() { return _use_hil_gps; }
+
+	bool			get_flow_control_enabled() { return _flow_control_enabled; }
+
+	bool			get_forwarding_on() { return _forwarding_on; }
 
 	/**
 	 * Handle waypoint related messages.
 	 */
-	void mavlink_wpm_message_handler(const mavlink_message_t *msg);
+	void			mavlink_wpm_message_handler(const mavlink_message_t *msg);
 
-	static int start_helper(int argc, char *argv[]);
+	static int		start_helper(int argc, char *argv[]);
 
 	/**
 	 * Handle parameter related messages.
 	 */
-	void mavlink_pm_message_handler(const mavlink_channel_t chan, const mavlink_message_t *msg);
+	void			mavlink_pm_message_handler(const mavlink_channel_t chan, const mavlink_message_t *msg);
 
-	void get_mavlink_mode_and_state(struct vehicle_status_s *status, struct position_setpoint_triplet_s *pos_sp_triplet, uint8_t *mavlink_state, uint8_t *mavlink_base_mode, uint32_t *mavlink_custom_mode);
+	void			get_mavlink_mode_and_state(struct vehicle_status_s *status, struct position_setpoint_triplet_s *pos_sp_triplet, uint8_t *mavlink_state, uint8_t *mavlink_base_mode, uint32_t *mavlink_custom_mode);
 
 	/**
 	 * Enable / disable Hardware in the Loop simulation mode.
@@ -179,78 +200,125 @@ public:
 	 *			requested change could not be made or was
 	 *			redundant.
 	 */
-	int		set_hil_enabled(bool hil_enabled);
+	int			set_hil_enabled(bool hil_enabled);
 
-	MavlinkOrbSubscription *add_orb_subscription(const orb_id_t topic);
+	MavlinkOrbSubscription	*add_orb_subscription(const orb_id_t topic);
 
-	int get_instance_id();
+	int			get_instance_id();
 
 	/**
 	 * Enable / disable hardware flow control.
 	 *
 	 * @param enabled	True if hardware flow control should be enabled
 	 */
-	int enable_flow_control(bool enabled);
+	int			enable_flow_control(bool enabled);
+
+	mavlink_channel_t	get_channel();
+
+	void configure_stream_threadsafe(const char *stream_name, float rate);
+
+	bool			_task_should_exit;	/**< if true, mavlink task should exit */
+
+	int			get_mavlink_fd() { return _mavlink_fd; }
+
+	MavlinkStream * get_streams() const { return _streams; }
+
 
-	mavlink_channel_t get_channel();
+	/* Functions for waiting to start transmission until message received. */
+	void			set_has_received_messages(bool received_messages) { _received_messages = received_messages; }
+	bool			get_has_received_messages() { return _received_messages; }
+	void			set_wait_to_transmit(bool wait) { _wait_to_transmit = wait; }
+	bool			get_wait_to_transmit() { return _wait_to_transmit; }
+	bool			should_transmit() { return (!_wait_to_transmit || (_wait_to_transmit && _received_messages)); }
 
-	bool		_task_should_exit;		/**< if true, mavlink task should exit */
+	bool			message_buffer_write(void *ptr, int size);
+    
+    void lockMessageBufferMutex(void) { pthread_mutex_lock(&_message_buffer_mutex); }
+    void unlockMessageBufferMutex(void) { pthread_mutex_unlock(&_message_buffer_mutex); }
+
+	/**
+	 * Count a transmision error
+	 */
+	void count_txerr();
 
 protected:
-	Mavlink	*next;
+	Mavlink			*next;
 
 private:
-	int _instance_id;
+	int			_instance_id;
 
-	int		_mavlink_fd;
-	bool		_task_running;
-
-	perf_counter_t	_loop_perf;			/**< loop performance counter */
+	int			_mavlink_fd;
+	bool			_task_running;
 
 	/* states */
-	bool		_hil_enabled;		/**< Hardware In the Loop mode */
-	bool		_is_usb_uart;		/**< Port is USB */
+	bool			_hil_enabled;		/**< Hardware In the Loop mode */
+	bool			_use_hil_gps;		/**< Accept GPS HIL messages (for example from an external motion capturing system to fake indoor gps) */
+	bool			_is_usb_uart;		/**< Port is USB */
+	bool        		_wait_to_transmit;  	/**< Wait to transmit until received messages. */
+	bool        		_received_messages;	/**< Whether we've received valid mavlink messages. */
 
-	unsigned	_main_loop_delay;		/**< mainloop delay, depends on data rate */
+	unsigned		_main_loop_delay;	/**< mainloop delay, depends on data rate */
 
-	MavlinkOrbSubscription *_subscriptions;
-	MavlinkStream *_streams;
+	MavlinkOrbSubscription	*_subscriptions;
+	MavlinkStream		*_streams;
 
-	orb_advert_t	_mission_pub;
-	struct mission_s mission;
-	uint8_t missionlib_msg_buf[MAVLINK_MAX_PACKET_LEN];
-	MAVLINK_MODE _mode;
+	orb_advert_t		_mission_pub;
+	struct mission_s	mission;
+	MAVLINK_MODE		_mode;
 
-	uint8_t _mavlink_wpm_comp_id;
-	mavlink_channel_t _channel;
+	uint8_t			_mavlink_wpm_comp_id;
+	mavlink_channel_t	_channel;
 
 	struct mavlink_logbuffer _logbuffer;
-	unsigned int _total_counter;
+	unsigned int		_total_counter;
 
-	pthread_t _receive_thread;
+	pthread_t		_receive_thread;
 
 	/* Allocate storage space for waypoints */
-	mavlink_wpm_storage _wpm_s;
-	mavlink_wpm_storage *_wpm;
+	mavlink_wpm_storage	_wpm_s;
+	mavlink_wpm_storage	*_wpm;
 
-	bool _verbose;
-	int _uart_fd;
-	int _baudrate;
-	int _datarate;
+	bool			_verbose;
+	bool			_forwarding_on;
+	bool			_passing_on;
+	bool			_ftp_on;
+	int			_uart_fd;
+	int			_baudrate;
+	int			_datarate;
 
 	/**
 	 * If the queue index is not at 0, the queue sending
 	 * logic will send parameters from the current index
 	 * to len - 1, the end of the param list.
 	 */
-	unsigned int _mavlink_param_queue_index;
+	unsigned int		_mavlink_param_queue_index;
+
+	bool			mavlink_link_termination_allowed;
+
+	char 			*_subscribe_to_stream;
+	float			_subscribe_to_stream_rate;
+
+	bool			_flow_control_enabled;
+
+	struct mavlink_message_buffer {
+		int write_ptr;
+		int read_ptr;
+		int size;
+		char *data;
+	};
 
-	bool mavlink_link_termination_allowed;
+	mavlink_message_buffer	_message_buffer;
 
-	char 	*_subscribe_to_stream;
-	float	_subscribe_to_stream_rate;
+	pthread_mutex_t		_message_buffer_mutex;
 
-	bool		_flow_control_enabled;
+	bool			_param_initialized;
+	param_t			_param_system_id;
+	param_t			_param_component_id;
+	param_t			_param_system_type;
+	param_t			_param_use_hil_gps;
+
+	perf_counter_t		_loop_perf;			/**< loop performance counter */
+	perf_counter_t		_txerr_perf;			/**< TX error counter */
 
 	/**
 	 * Send one parameter.
@@ -258,7 +326,7 @@ private:
 	 * @param param		The parameter id to send.
 	 * @return		zero on success, nonzero on failure.
 	 */
-	int mavlink_pm_send_param(param_t param);
+	int			mavlink_pm_send_param(param_t param);
 
 	/**
 	 * Send one parameter identified by index.
@@ -266,7 +334,7 @@ private:
 	 * @param index		The index of the parameter to send.
 	 * @return		zero on success, nonzero else.
 	 */
-	int mavlink_pm_send_param_for_index(uint16_t index);
+	int			mavlink_pm_send_param_for_index(uint16_t index);
 
 	/**
 	 * Send one parameter identified by name.
@@ -274,14 +342,14 @@ private:
 	 * @param name		The index of the parameter to send.
 	 * @return		zero on success, nonzero else.
 	 */
-	int mavlink_pm_send_param_for_name(const char *name);
+	int			mavlink_pm_send_param_for_name(const char *name);
 
 	/**
 	 * Send a queue of parameters, one parameter per function call.
 	 *
 	 * @return		zero on success, nonzero on failure
 	 */
-	int mavlink_pm_queued_send(void);
+	int			mavlink_pm_queued_send(void);
 
 	/**
 	 * Start sending the parameter queue.
@@ -291,12 +359,12 @@ private:
 	 * mavlink_pm_queued_send().
 	 * @see 		mavlink_pm_queued_send()
 	 */
-	void mavlink_pm_start_queued_send();
+	void			mavlink_pm_start_queued_send();
 
-	void mavlink_update_system();
+	void			mavlink_update_system();
 
-	void mavlink_waypoint_eventloop(uint64_t now);
-	void mavlink_wpm_send_waypoint_reached(uint16_t seq);
+	void			mavlink_waypoint_eventloop(uint64_t now);
+	void 			mavlink_wpm_send_waypoint_reached(uint16_t seq);
 	void mavlink_wpm_send_waypoint_request(uint8_t sysid, uint8_t compid, uint16_t seq);
 	void mavlink_wpm_send_waypoint(uint8_t sysid, uint8_t compid, uint16_t seq);
 	void mavlink_wpm_send_waypoint_count(uint8_t sysid, uint8_t compid, uint16_t count);
@@ -313,7 +381,20 @@ private:
 	int mavlink_open_uart(int baudrate, const char *uart_name, struct termios *uart_config_original, bool *is_usb);
 
 	int configure_stream(const char *stream_name, const float rate);
-	void configure_stream_threadsafe(const char *stream_name, const float rate);
+
+	int message_buffer_init(int size);
+
+	void message_buffer_destroy();
+
+	int message_buffer_count();
+
+	int message_buffer_is_empty();
+
+	int message_buffer_get_ptr(void **ptr, bool *is_part);
+
+	void message_buffer_mark_read(int n);
+
+	void pass_message(mavlink_message_t *msg);
 
 	static int	mavlink_dev_ioctl(struct file *filep, int cmd, unsigned long arg);
 
diff --git a/src/modules/mavlink/mavlink_messages.cpp b/src/modules/mavlink/mavlink_messages.cpp
index 4ca3840d4..e91b73d1b 100644
--- a/src/modules/mavlink/mavlink_messages.cpp
+++ b/src/modules/mavlink/mavlink_messages.cpp
@@ -45,7 +45,6 @@
 
 #include <uORB/uORB.h>
 #include <uORB/topics/sensor_combined.h>
-#include <uORB/topics/rc_channels.h>
 #include <uORB/topics/vehicle_attitude.h>
 #include <uORB/topics/vehicle_gps_position.h>
 #include <uORB/topics/vehicle_global_position.h>
@@ -72,6 +71,9 @@
 #include <uORB/topics/navigation_capabilities.h>
 #include <drivers/drv_rc_input.h>
 #include <drivers/drv_pwm_output.h>
+#include <drivers/drv_range_finder.h>
+
+#include <systemlib/err.h>
 
 #include "mavlink_messages.h"
 
@@ -117,46 +119,77 @@ void get_mavlink_mode_state(struct vehicle_status_s *status, struct position_set
 	union px4_custom_mode custom_mode;
 	custom_mode.data = 0;
 
-	if (pos_sp_triplet->nav_state == NAV_STATE_NONE) {
-		/* use main state when navigator is not active */
-		if (status->main_state == MAIN_STATE_MANUAL) {
-			*mavlink_base_mode |= MAV_MODE_FLAG_MANUAL_INPUT_ENABLED | (status->is_rotary_wing ? MAV_MODE_FLAG_STABILIZE_ENABLED : 0);
-			custom_mode.main_mode = PX4_CUSTOM_MAIN_MODE_MANUAL;
-
-		} else if (status->main_state == MAIN_STATE_SEATBELT) {
-			*mavlink_base_mode |= MAV_MODE_FLAG_MANUAL_INPUT_ENABLED | MAV_MODE_FLAG_STABILIZE_ENABLED;
-			custom_mode.main_mode = PX4_CUSTOM_MAIN_MODE_SEATBELT;
+	switch (status->nav_state) {
 
-		} else if (status->main_state == MAIN_STATE_EASY) {
-			*mavlink_base_mode |= MAV_MODE_FLAG_MANUAL_INPUT_ENABLED | MAV_MODE_FLAG_STABILIZE_ENABLED | MAV_MODE_FLAG_GUIDED_ENABLED;
-			custom_mode.main_mode = PX4_CUSTOM_MAIN_MODE_EASY;
-
-		} else if (status->main_state == MAIN_STATE_AUTO) {
-			*mavlink_base_mode |= MAV_MODE_FLAG_AUTO_ENABLED | MAV_MODE_FLAG_STABILIZE_ENABLED | MAV_MODE_FLAG_GUIDED_ENABLED;
+		case NAVIGATION_STATE_MANUAL:
+			*mavlink_base_mode |= MAV_MODE_FLAG_MANUAL_INPUT_ENABLED
+			                      | (status->is_rotary_wing ? MAV_MODE_FLAG_STABILIZE_ENABLED : 0);
+			custom_mode.main_mode = PX4_CUSTOM_MAIN_MODE_MANUAL;
+			break;
+
+		case NAVIGATION_STATE_ACRO:
+			*mavlink_base_mode |= MAV_MODE_FLAG_MANUAL_INPUT_ENABLED;
+			custom_mode.main_mode = PX4_CUSTOM_MAIN_MODE_ACRO;
+			break;
+
+		case NAVIGATION_STATE_ALTCTL:
+			*mavlink_base_mode |= MAV_MODE_FLAG_MANUAL_INPUT_ENABLED
+			                      | MAV_MODE_FLAG_STABILIZE_ENABLED;
+			custom_mode.main_mode = PX4_CUSTOM_MAIN_MODE_ALTCTL;
+			break;
+
+		case NAVIGATION_STATE_POSCTL:
+			*mavlink_base_mode |= MAV_MODE_FLAG_MANUAL_INPUT_ENABLED
+			                      | MAV_MODE_FLAG_STABILIZE_ENABLED
+					      | MAV_MODE_FLAG_GUIDED_ENABLED;
+			custom_mode.main_mode = PX4_CUSTOM_MAIN_MODE_POSCTL;
+			break;
+
+		case NAVIGATION_STATE_AUTO_MISSION:
+			*mavlink_base_mode |= MAV_MODE_FLAG_AUTO_ENABLED
+			                      | MAV_MODE_FLAG_STABILIZE_ENABLED
+					      | MAV_MODE_FLAG_GUIDED_ENABLED;
 			custom_mode.main_mode = PX4_CUSTOM_MAIN_MODE_AUTO;
-			custom_mode.sub_mode = PX4_CUSTOM_SUB_MODE_AUTO_READY;
-		}
-
-	} else {
-		/* use navigation state when navigator is active */
-		*mavlink_base_mode |= MAV_MODE_FLAG_AUTO_ENABLED | MAV_MODE_FLAG_STABILIZE_ENABLED | MAV_MODE_FLAG_GUIDED_ENABLED;
-		custom_mode.main_mode = PX4_CUSTOM_MAIN_MODE_AUTO;
-
-		if (pos_sp_triplet->nav_state == NAV_STATE_READY) {
-			custom_mode.sub_mode = PX4_CUSTOM_SUB_MODE_AUTO_READY;
+			custom_mode.sub_mode = PX4_CUSTOM_SUB_MODE_AUTO_MISSION;
+			break;
 
-		} else if (pos_sp_triplet->nav_state == NAV_STATE_LOITER) {
+		case NAVIGATION_STATE_AUTO_LOITER:
+			*mavlink_base_mode |= MAV_MODE_FLAG_AUTO_ENABLED
+			                      | MAV_MODE_FLAG_STABILIZE_ENABLED
+					      | MAV_MODE_FLAG_GUIDED_ENABLED;
+			custom_mode.main_mode = PX4_CUSTOM_MAIN_MODE_AUTO;
 			custom_mode.sub_mode = PX4_CUSTOM_SUB_MODE_AUTO_LOITER;
+			break;
 
-		} else if (pos_sp_triplet->nav_state == NAV_STATE_MISSION) {
-			custom_mode.sub_mode = PX4_CUSTOM_SUB_MODE_AUTO_MISSION;
-
-		} else if (pos_sp_triplet->nav_state == NAV_STATE_RTL) {
+		case NAVIGATION_STATE_AUTO_RTL:
+			*mavlink_base_mode |= MAV_MODE_FLAG_AUTO_ENABLED
+			                      | MAV_MODE_FLAG_STABILIZE_ENABLED
+					      | MAV_MODE_FLAG_GUIDED_ENABLED;
+			custom_mode.main_mode = PX4_CUSTOM_MAIN_MODE_AUTO;
 			custom_mode.sub_mode = PX4_CUSTOM_SUB_MODE_AUTO_RTL;
+			break;
 
-		} else if (pos_sp_triplet->nav_state == NAV_STATE_LAND) {
+		case NAVIGATION_STATE_LAND:
+			*mavlink_base_mode |= MAV_MODE_FLAG_AUTO_ENABLED
+			                      | MAV_MODE_FLAG_STABILIZE_ENABLED
+					      | MAV_MODE_FLAG_GUIDED_ENABLED;
+			custom_mode.main_mode = PX4_CUSTOM_MAIN_MODE_AUTO;
 			custom_mode.sub_mode = PX4_CUSTOM_SUB_MODE_AUTO_LAND;
-		}
+			break;
+
+		case NAVIGATION_STATE_AUTO_RTGS:
+			*mavlink_base_mode |= MAV_MODE_FLAG_AUTO_ENABLED
+			                      | MAV_MODE_FLAG_STABILIZE_ENABLED
+					      | MAV_MODE_FLAG_GUIDED_ENABLED;
+			custom_mode.main_mode = PX4_CUSTOM_MAIN_MODE_AUTO;
+			custom_mode.sub_mode = PX4_CUSTOM_SUB_MODE_AUTO_RTGS;
+			break;
+
+		case NAVIGATION_STATE_TERMINATION:
+			*mavlink_base_mode |= MAV_MODE_FLAG_MANUAL_INPUT_ENABLED;
+			custom_mode.main_mode = PX4_CUSTOM_MAIN_MODE_MANUAL;
+			break;
+
 	}
 
 	*mavlink_custom_mode = custom_mode.data;
@@ -188,42 +221,57 @@ void get_mavlink_mode_state(struct vehicle_status_s *status, struct position_set
 class MavlinkStreamHeartbeat : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamHeartbeat::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "HEARTBEAT";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_HEARTBEAT;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamHeartbeat();
 	}
 
 private:
 	MavlinkOrbSubscription *status_sub;
-	struct vehicle_status_s *status;
-
 	MavlinkOrbSubscription *pos_sp_triplet_sub;
-	struct position_setpoint_triplet_s *pos_sp_triplet;
 
 protected:
 	void subscribe(Mavlink *mavlink)
 	{
 		status_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_status));
-		status = (struct vehicle_status_s *)status_sub->get_data();
-
 		pos_sp_triplet_sub = mavlink->add_orb_subscription(ORB_ID(position_setpoint_triplet));
-		pos_sp_triplet = (struct position_setpoint_triplet_s *)pos_sp_triplet_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		(void)status_sub->update(t);
-		(void)pos_sp_triplet_sub->update(t);
+		struct vehicle_status_s status;
+		struct position_setpoint_triplet_s pos_sp_triplet;
+
+		/* always send the heartbeat, independent of the update status of the topics */
+		if (!status_sub->update(&status)) {
+			/* if topic update failed fill it with defaults */
+			memset(&status, 0, sizeof(status));
+		}
+
+		if (!pos_sp_triplet_sub->update(&pos_sp_triplet)) {
+			/* if topic update failed fill it with defaults */
+			memset(&pos_sp_triplet, 0, sizeof(pos_sp_triplet));
+		}
 
 		uint8_t mavlink_state = 0;
 		uint8_t mavlink_base_mode = 0;
 		uint32_t mavlink_custom_mode = 0;
-		get_mavlink_mode_state(status, pos_sp_triplet, &mavlink_state, &mavlink_base_mode, &mavlink_custom_mode);
+		get_mavlink_mode_state(&status, &pos_sp_triplet, &mavlink_state, &mavlink_base_mode, &mavlink_custom_mode);
 
 		mavlink_msg_heartbeat_send(_channel,
 					   mavlink_system.type,
@@ -231,7 +279,6 @@ protected:
 					   mavlink_base_mode,
 					   mavlink_custom_mode,
 					   mavlink_state);
-
 	}
 };
 
@@ -239,44 +286,54 @@ protected:
 class MavlinkStreamSysStatus : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamSysStatus::get_name_static();
+	}
+
+	static const char *get_name_static ()
 	{
 		return "SYS_STATUS";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_SYS_STATUS;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamSysStatus();
 	}
 
 private:
 	MavlinkOrbSubscription *status_sub;
-	struct vehicle_status_s *status;
 
 protected:
 	void subscribe(Mavlink *mavlink)
 	{
 		status_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_status));
-		status = (struct vehicle_status_s *)status_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (status_sub->update(t)) {
+		struct vehicle_status_s status;
+
+		if (status_sub->update(&status)) {
 			mavlink_msg_sys_status_send(_channel,
-						    status->onboard_control_sensors_present,
-						    status->onboard_control_sensors_enabled,
-						    status->onboard_control_sensors_health,
-						    status->load * 1000.0f,
-						    status->battery_voltage * 1000.0f,
-						    status->battery_current * 1000.0f,
-						    status->battery_remaining,
-						    status->drop_rate_comm,
-						    status->errors_comm,
-						    status->errors_count1,
-						    status->errors_count2,
-						    status->errors_count3,
-						    status->errors_count4);
+							status.onboard_control_sensors_present,
+							status.onboard_control_sensors_enabled,
+							status.onboard_control_sensors_health,
+							status.load * 1000.0f,
+							status.battery_voltage * 1000.0f,
+							status.battery_current * 100.0f,
+							status.battery_remaining * 100.0f,
+							status.drop_rate_comm,
+							status.errors_comm,
+							status.errors_count1,
+							status.errors_count2,
+							status.errors_count3,
+							status.errors_count4);
 		}
 	}
 };
@@ -285,23 +342,29 @@ protected:
 class MavlinkStreamHighresIMU : public MavlinkStream
 {
 public:
-	MavlinkStreamHighresIMU() : MavlinkStream(), accel_timestamp(0), gyro_timestamp(0), mag_timestamp(0), baro_timestamp(0)
+	const char *get_name() const
 	{
+		return MavlinkStreamHighresIMU::get_name_static();
 	}
 
-	const char *get_name()
+	static const char *get_name_static()
 	{
 		return "HIGHRES_IMU";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_HIGHRES_IMU;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamHighresIMU();
 	}
 
 private:
 	MavlinkOrbSubscription *sensor_sub;
-	struct sensor_combined_s *sensor;
+	uint64_t sensor_time;
 
 	uint64_t accel_timestamp;
 	uint64_t gyro_timestamp;
@@ -309,48 +372,57 @@ private:
 	uint64_t baro_timestamp;
 
 protected:
+	explicit MavlinkStreamHighresIMU() : MavlinkStream(),
+		sensor_time(0),
+		accel_timestamp(0),
+		gyro_timestamp(0),
+		mag_timestamp(0),
+		baro_timestamp(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		sensor_sub = mavlink->add_orb_subscription(ORB_ID(sensor_combined));
-		sensor = (struct sensor_combined_s *)sensor_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (sensor_sub->update(t)) {
+		struct sensor_combined_s sensor;
+
+		if (sensor_sub->update(&sensor_time, &sensor)) {
 			uint16_t fields_updated = 0;
 
-			if (accel_timestamp != sensor->accelerometer_timestamp) {
+			if (accel_timestamp != sensor.accelerometer_timestamp) {
 				/* mark first three dimensions as changed */
 				fields_updated |= (1 << 0) | (1 << 1) | (1 << 2);
-				accel_timestamp = sensor->accelerometer_timestamp;
+				accel_timestamp = sensor.accelerometer_timestamp;
 			}
 
-			if (gyro_timestamp != sensor->timestamp) {
+			if (gyro_timestamp != sensor.timestamp) {
 				/* mark second group dimensions as changed */
 				fields_updated |= (1 << 3) | (1 << 4) | (1 << 5);
-				gyro_timestamp = sensor->timestamp;
+				gyro_timestamp = sensor.timestamp;
 			}
 
-			if (mag_timestamp != sensor->magnetometer_timestamp) {
+			if (mag_timestamp != sensor.magnetometer_timestamp) {
 				/* mark third group dimensions as changed */
 				fields_updated |= (1 << 6) | (1 << 7) | (1 << 8);
-				mag_timestamp = sensor->magnetometer_timestamp;
+				mag_timestamp = sensor.magnetometer_timestamp;
 			}
 
-			if (baro_timestamp != sensor->baro_timestamp) {
+			if (baro_timestamp != sensor.baro_timestamp) {
 				/* mark last group dimensions as changed */
 				fields_updated |= (1 << 9) | (1 << 11) | (1 << 12);
-				baro_timestamp = sensor->baro_timestamp;
+				baro_timestamp = sensor.baro_timestamp;
 			}
 
 			mavlink_msg_highres_imu_send(_channel,
-						     sensor->timestamp,
-						     sensor->accelerometer_m_s2[0], sensor->accelerometer_m_s2[1], sensor->accelerometer_m_s2[2],
-						     sensor->gyro_rad_s[0], sensor->gyro_rad_s[1], sensor->gyro_rad_s[2],
-						     sensor->magnetometer_ga[0], sensor->magnetometer_ga[1], sensor->magnetometer_ga[2],
-						     sensor->baro_pres_mbar, sensor->differential_pressure_pa,
-						     sensor->baro_alt_meter, sensor->baro_temp_celcius,
+						     sensor.timestamp,
+						     sensor.accelerometer_m_s2[0], sensor.accelerometer_m_s2[1], sensor.accelerometer_m_s2[2],
+						     sensor.gyro_rad_s[0], sensor.gyro_rad_s[1], sensor.gyro_rad_s[2],
+						     sensor.magnetometer_ga[0], sensor.magnetometer_ga[1], sensor.magnetometer_ga[2],
+						     sensor.baro_pres_mbar, sensor.differential_pressure_pa,
+						     sensor.baro_alt_meter, sensor.baro_temp_celcius,
 						     fields_updated);
 		}
 	}
@@ -360,34 +432,49 @@ protected:
 class MavlinkStreamAttitude : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamAttitude::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "ATTITUDE";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_ATTITUDE;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamAttitude();
 	}
 
 private:
 	MavlinkOrbSubscription *att_sub;
-	struct vehicle_attitude_s *att;
+	uint64_t att_time;
 
 protected:
+	explicit MavlinkStreamAttitude() : MavlinkStream(),
+		att_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		att_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_attitude));
-		att = (struct vehicle_attitude_s *)att_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (att_sub->update(t)) {
+		struct vehicle_attitude_s att;
+
+		if (att_sub->update(&att_time, &att)) {
 			mavlink_msg_attitude_send(_channel,
-						  att->timestamp / 1000,
-						  att->roll, att->pitch, att->yaw,
-						  att->rollspeed, att->pitchspeed, att->yawspeed);
+						  att.timestamp / 1000,
+						  att.roll, att.pitch, att.yaw,
+						  att.rollspeed, att.pitchspeed, att.yawspeed);
 		}
 	}
 };
@@ -396,39 +483,54 @@ protected:
 class MavlinkStreamAttitudeQuaternion : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamAttitudeQuaternion::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "ATTITUDE_QUATERNION";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_ATTITUDE_QUATERNION;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamAttitudeQuaternion();
 	}
 
 private:
 	MavlinkOrbSubscription *att_sub;
-	struct vehicle_attitude_s *att;
+	uint64_t att_time;
 
 protected:
+	explicit MavlinkStreamAttitudeQuaternion() : MavlinkStream(),
+		att_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		att_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_attitude));
-		att = (struct vehicle_attitude_s *)att_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (att_sub->update(t)) {
+		struct vehicle_attitude_s att;
+
+		if (att_sub->update(&att_time, &att)) {
 			mavlink_msg_attitude_quaternion_send(_channel,
-							     att->timestamp / 1000,
-							     att->q[0],
-							     att->q[1],
-							     att->q[2],
-							     att->q[3],
-							     att->rollspeed,
-							     att->pitchspeed,
-							     att->yawspeed);
+							     att.timestamp / 1000,
+							     att.q[0],
+							     att.q[1],
+							     att.q[2],
+							     att.q[3],
+							     att.rollspeed,
+							     att.pitchspeed,
+							     att.yawspeed);
 		}
 	}
 };
@@ -437,71 +539,87 @@ protected:
 class MavlinkStreamVFRHUD : public MavlinkStream
 {
 public:
-	const char *get_name()
+
+	const char *get_name() const
+	{
+		return MavlinkStreamVFRHUD::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "VFR_HUD";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_VFR_HUD;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamVFRHUD();
 	}
 
 private:
 	MavlinkOrbSubscription *att_sub;
-	struct vehicle_attitude_s *att;
+	uint64_t att_time;
 
 	MavlinkOrbSubscription *pos_sub;
-	struct vehicle_global_position_s *pos;
+	uint64_t pos_time;
 
 	MavlinkOrbSubscription *armed_sub;
-	struct actuator_armed_s *armed;
+	uint64_t armed_time;
 
 	MavlinkOrbSubscription *act_sub;
-	struct actuator_controls_s *act;
+	uint64_t act_time;
 
 	MavlinkOrbSubscription *airspeed_sub;
-	struct airspeed_s *airspeed;
+	uint64_t airspeed_time;
 
 protected:
+	explicit MavlinkStreamVFRHUD() : MavlinkStream(),
+		att_time(0),
+		pos_time(0),
+		armed_time(0),
+		act_time(0),
+		airspeed_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		att_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_attitude));
-		att = (struct vehicle_attitude_s *)att_sub->get_data();
-
 		pos_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_global_position));
-		pos = (struct vehicle_global_position_s *)pos_sub->get_data();
-
 		armed_sub = mavlink->add_orb_subscription(ORB_ID(actuator_armed));
-		armed = (struct actuator_armed_s *)armed_sub->get_data();
-
 		act_sub = mavlink->add_orb_subscription(ORB_ID(actuator_controls_0));
-		act = (struct actuator_controls_s *)act_sub->get_data();
-
 		airspeed_sub = mavlink->add_orb_subscription(ORB_ID(airspeed));
-		airspeed = (struct airspeed_s *)airspeed_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		bool updated = att_sub->update(t);
-		updated |= pos_sub->update(t);
-		updated |= armed_sub->update(t);
-		updated |= act_sub->update(t);
-		updated |= airspeed_sub->update(t);
+		struct vehicle_attitude_s att;
+		struct vehicle_global_position_s pos;
+		struct actuator_armed_s armed;
+		struct actuator_controls_s act;
+		struct airspeed_s airspeed;
+
+		bool updated = att_sub->update(&att_time, &att);
+		updated |= pos_sub->update(&pos_time, &pos);
+		updated |= armed_sub->update(&armed_time, &armed);
+		updated |= act_sub->update(&act_time, &act);
+		updated |= airspeed_sub->update(&airspeed_time, &airspeed);
 
 		if (updated) {
-			float groundspeed = sqrtf(pos->vel_n * pos->vel_n + pos->vel_e * pos->vel_e);
-			uint16_t heading = _wrap_2pi(att->yaw) * M_RAD_TO_DEG_F;
-			float throttle = armed->armed ? act->control[3] * 100.0f : 0.0f;
+			float groundspeed = sqrtf(pos.vel_n * pos.vel_n + pos.vel_e * pos.vel_e);
+			uint16_t heading = _wrap_2pi(att.yaw) * M_RAD_TO_DEG_F;
+			float throttle = armed.armed ? act.control[3] * 100.0f : 0.0f;
 
 			mavlink_msg_vfr_hud_send(_channel,
-						 airspeed->true_airspeed_m_s,
+						 airspeed.true_airspeed_m_s,
 						 groundspeed,
 						 heading,
 						 throttle,
-						 pos->alt,
-						 -pos->vel_d);
+						 pos.alt,
+						 -pos.vel_d);
 		}
 	}
 };
@@ -510,41 +628,56 @@ protected:
 class MavlinkStreamGPSRawInt : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamGPSRawInt::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "GPS_RAW_INT";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_GPS_RAW_INT;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamGPSRawInt();
 	}
 
 private:
 	MavlinkOrbSubscription *gps_sub;
-	struct vehicle_gps_position_s *gps;
+	uint64_t gps_time;
 
 protected:
+	explicit MavlinkStreamGPSRawInt() : MavlinkStream(),
+		gps_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		gps_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_gps_position));
-		gps = (struct vehicle_gps_position_s *)gps_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (gps_sub->update(t)) {
+		struct vehicle_gps_position_s gps;
+
+		if (gps_sub->update(&gps_time, &gps)) {
 			mavlink_msg_gps_raw_int_send(_channel,
-						     gps->timestamp_position,
-						     gps->fix_type,
-						     gps->lat,
-						     gps->lon,
-						     gps->alt,
-						     cm_uint16_from_m_float(gps->eph_m),
-						     cm_uint16_from_m_float(gps->epv_m),
-						     gps->vel_m_s * 100.0f,
-						     _wrap_2pi(gps->cog_rad) * M_RAD_TO_DEG_F * 1e2f,
-						     gps->satellites_visible);
+						     gps.timestamp_position,
+						     gps.fix_type,
+						     gps.lat,
+						     gps.lon,
+						     gps.alt,
+						     cm_uint16_from_m_float(gps.eph),
+						     cm_uint16_from_m_float(gps.epv),
+						     gps.vel_m_s * 100.0f,
+						     _wrap_2pi(gps.cog_rad) * M_RAD_TO_DEG_F * 1e2f,
+						     gps.satellites_visible);
 		}
 	}
 };
@@ -553,49 +686,64 @@ protected:
 class MavlinkStreamGlobalPositionInt : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamGlobalPositionInt::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "GLOBAL_POSITION_INT";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_GLOBAL_POSITION_INT;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamGlobalPositionInt();
 	}
 
 private:
 	MavlinkOrbSubscription *pos_sub;
-	struct vehicle_global_position_s *pos;
+	uint64_t pos_time;
 
 	MavlinkOrbSubscription *home_sub;
-	struct home_position_s *home;
+	uint64_t home_time;
 
 protected:
+	explicit MavlinkStreamGlobalPositionInt() : MavlinkStream(),
+		pos_time(0),
+		home_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		pos_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_global_position));
-		pos = (struct vehicle_global_position_s *)pos_sub->get_data();
-
 		home_sub = mavlink->add_orb_subscription(ORB_ID(home_position));
-		home = (struct home_position_s *)home_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		bool updated = pos_sub->update(t);
-		updated |= home_sub->update(t);
+		struct vehicle_global_position_s pos;
+		struct home_position_s home;
+
+		bool updated = pos_sub->update(&pos_time, &pos);
+		updated |= home_sub->update(&home_time, &home);
 
 		if (updated) {
 			mavlink_msg_global_position_int_send(_channel,
-							     pos->timestamp / 1000,
-							     pos->lat * 1e7,
-							     pos->lon * 1e7,
-							     pos->alt * 1000.0f,
-							     (pos->alt - home->alt) * 1000.0f,
-							     pos->vel_n * 100.0f,
-							     pos->vel_e * 100.0f,
-							     pos->vel_d * 100.0f,
-							     _wrap_2pi(pos->yaw) * M_RAD_TO_DEG_F * 100.0f);
+							     pos.timestamp / 1000,
+							     pos.lat * 1e7,
+							     pos.lon * 1e7,
+							     pos.alt * 1000.0f,
+							     (pos.alt - home.alt) * 1000.0f,
+							     pos.vel_n * 100.0f,
+							     pos.vel_e * 100.0f,
+							     pos.vel_d * 100.0f,
+							     _wrap_2pi(pos.yaw) * M_RAD_TO_DEG_F * 100.0f);
 		}
 	}
 };
@@ -604,38 +752,109 @@ protected:
 class MavlinkStreamLocalPositionNED : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamLocalPositionNED::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "LOCAL_POSITION_NED";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_LOCAL_POSITION_NED;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamLocalPositionNED();
 	}
 
 private:
 	MavlinkOrbSubscription *pos_sub;
-	struct vehicle_local_position_s *pos;
+	uint64_t pos_time;
 
 protected:
+	explicit MavlinkStreamLocalPositionNED() : MavlinkStream(),
+		pos_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		pos_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_local_position));
-		pos = (struct vehicle_local_position_s *)pos_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (pos_sub->update(t)) {
+		struct vehicle_local_position_s pos;
+
+		if (pos_sub->update(&pos_time, &pos)) {
 			mavlink_msg_local_position_ned_send(_channel,
-							    pos->timestamp / 1000,
-							    pos->x,
-							    pos->y,
-							    pos->z,
-							    pos->vx,
-							    pos->vy,
-							    pos->vz);
+							    pos.timestamp / 1000,
+							    pos.x,
+							    pos.y,
+							    pos.z,
+							    pos.vx,
+							    pos.vy,
+							    pos.vz);
+		}
+	}
+};
+
+
+
+class MavlinkStreamViconPositionEstimate : public MavlinkStream
+{
+public:
+	const char *get_name() const
+	{
+		return MavlinkStreamViconPositionEstimate::get_name_static();
+	}
+
+	static const char *get_name_static()
+	{
+		return "VICON_POSITION_ESTIMATE";
+	}
+
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_VICON_POSITION_ESTIMATE;
+	}
+
+	static MavlinkStream *new_instance()
+	{
+		return new MavlinkStreamViconPositionEstimate();
+	}
+
+private:
+	MavlinkOrbSubscription *pos_sub;
+	uint64_t pos_time;
+
+protected:
+	explicit MavlinkStreamViconPositionEstimate() : MavlinkStream(),
+		pos_time(0)
+	{}
+
+	void subscribe(Mavlink *mavlink)
+	{
+		pos_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_vicon_position));
+	}
+
+	void send(const hrt_abstime t)
+	{
+		struct vehicle_vicon_position_s pos;
+
+		if (pos_sub->update(&pos_time, &pos)) {
+			mavlink_msg_vicon_position_estimate_send(_channel,
+								pos.timestamp / 1000,
+								pos.x,
+								pos.y,
+								pos.z,
+								pos.roll,
+								pos.pitch,
+								pos.yaw);
 		}
 	}
 };
@@ -644,70 +863,97 @@ protected:
 class MavlinkStreamGPSGlobalOrigin : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamGPSGlobalOrigin::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "GPS_GLOBAL_ORIGIN";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_GPS_GLOBAL_ORIGIN;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamGPSGlobalOrigin();
 	}
 
 private:
 	MavlinkOrbSubscription *home_sub;
-	struct home_position_s *home;
 
 protected:
 	void subscribe(Mavlink *mavlink)
 	{
 		home_sub = mavlink->add_orb_subscription(ORB_ID(home_position));
-		home = (struct home_position_s *)home_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-
 		/* we're sending the GPS home periodically to ensure the
 		 * the GCS does pick it up at one point */
 		if (home_sub->is_published()) {
-			home_sub->update(t);
+			struct home_position_s home;
 
-			mavlink_msg_gps_global_origin_send(_channel,
-							   (int32_t)(home->lat * 1e7),
-							   (int32_t)(home->lon * 1e7),
-							   (int32_t)(home->alt) * 1000.0f);
+			if (home_sub->update(&home)) {
+				mavlink_msg_gps_global_origin_send(_channel,
+								   (int32_t)(home.lat * 1e7),
+								   (int32_t)(home.lon * 1e7),
+								   (int32_t)(home.alt) * 1000.0f);
+			}
 		}
 	}
 };
 
-
+template <int N>
 class MavlinkStreamServoOutputRaw : public MavlinkStream
 {
 public:
-	MavlinkStreamServoOutputRaw(unsigned int n) : MavlinkStream(), _n(n)
+	const char *get_name() const
 	{
-		sprintf(_name, "SERVO_OUTPUT_RAW_%d", _n);
+		return MavlinkStreamServoOutputRaw<N>::get_name_static();
 	}
 
-	const char *get_name()
+	uint8_t get_id()
 	{
-		return _name;
+		return MAVLINK_MSG_ID_SERVO_OUTPUT_RAW;
 	}
 
-	MavlinkStream *new_instance()
+	static const char *get_name_static()
 	{
-		return new MavlinkStreamServoOutputRaw(_n);
+		switch (N) {
+			case 0:
+			return "SERVO_OUTPUT_RAW_0";
+
+			case 1:
+			return "SERVO_OUTPUT_RAW_1";
+
+			case 2:
+			return "SERVO_OUTPUT_RAW_2";
+
+			case 3:
+			return "SERVO_OUTPUT_RAW_3";
+		}
+	}
+
+	static MavlinkStream *new_instance()
+	{
+		return new MavlinkStreamServoOutputRaw<N>();
 	}
 
 private:
 	MavlinkOrbSubscription *act_sub;
-	struct actuator_outputs_s *act;
-
-	char _name[20];
-	unsigned int _n;
+	uint64_t act_time;
 
 protected:
+	explicit MavlinkStreamServoOutputRaw() : MavlinkStream(),
+		act_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		orb_id_t act_topics[] = {
@@ -717,24 +963,25 @@ protected:
 			ORB_ID(actuator_outputs_3)
 		};
 
-		act_sub = mavlink->add_orb_subscription(act_topics[_n]);
-		act = (struct actuator_outputs_s *)act_sub->get_data();
+		act_sub = mavlink->add_orb_subscription(act_topics[N]);
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (act_sub->update(t)) {
+		struct actuator_outputs_s act;
+
+		if (act_sub->update(&act_time, &act)) {
 			mavlink_msg_servo_output_raw_send(_channel,
-							  act->timestamp / 1000,
-							  _n,
-							  act->output[0],
-							  act->output[1],
-							  act->output[2],
-							  act->output[3],
-							  act->output[4],
-							  act->output[5],
-							  act->output[6],
-							  act->output[7]);
+							  act.timestamp / 1000,
+							  N,
+							  act.output[0],
+							  act.output[1],
+							  act.output[2],
+							  act.output[3],
+							  act.output[4],
+							  act.output[5],
+							  act.output[6],
+							  act.output[7]);
 		}
 	}
 };
@@ -743,51 +990,66 @@ protected:
 class MavlinkStreamHILControls : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamHILControls::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "HIL_CONTROLS";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_HIL_CONTROLS;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamHILControls();
 	}
 
 private:
 	MavlinkOrbSubscription *status_sub;
-	struct vehicle_status_s *status;
+	uint64_t status_time;
 
 	MavlinkOrbSubscription *pos_sp_triplet_sub;
-	struct position_setpoint_triplet_s *pos_sp_triplet;
+	uint64_t pos_sp_triplet_time;
 
 	MavlinkOrbSubscription *act_sub;
-	struct actuator_outputs_s *act;
+	uint64_t act_time;
 
 protected:
+	explicit MavlinkStreamHILControls() : MavlinkStream(),
+		status_time(0),
+		pos_sp_triplet_time(0),
+		act_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		status_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_status));
-		status = (struct vehicle_status_s *)status_sub->get_data();
-
 		pos_sp_triplet_sub = mavlink->add_orb_subscription(ORB_ID(position_setpoint_triplet));
-		pos_sp_triplet = (struct position_setpoint_triplet_s *)pos_sp_triplet_sub->get_data();
-
 		act_sub = mavlink->add_orb_subscription(ORB_ID(actuator_outputs_0));
-		act = (struct actuator_outputs_s *)act_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		bool updated = status_sub->update(t);
-		updated |= pos_sp_triplet_sub->update(t);
-		updated |= act_sub->update(t);
+		struct vehicle_status_s status;
+		struct position_setpoint_triplet_s pos_sp_triplet;
+		struct actuator_outputs_s act;
 
-		if (updated) {
+		bool updated = act_sub->update(&act_time, &act);
+		updated |= pos_sp_triplet_sub->update(&pos_sp_triplet_time, &pos_sp_triplet);
+		updated |= status_sub->update(&status_time, &status);
+
+		if (updated && (status.arming_state == ARMING_STATE_ARMED)) {
 			/* translate the current syste state to mavlink state and mode */
 			uint8_t mavlink_state;
 			uint8_t mavlink_base_mode;
 			uint32_t mavlink_custom_mode;
-			get_mavlink_mode_state(status, pos_sp_triplet, &mavlink_state, &mavlink_base_mode, &mavlink_custom_mode);
+			get_mavlink_mode_state(&status, &pos_sp_triplet, &mavlink_state, &mavlink_base_mode, &mavlink_custom_mode);
 
 			if (mavlink_system.type == MAV_TYPE_QUADROTOR ||
 				mavlink_system.type == MAV_TYPE_HEXAROTOR ||
@@ -816,7 +1078,7 @@ protected:
 					if (i < n) {
 						if (mavlink_base_mode & MAV_MODE_FLAG_SAFETY_ARMED) {
 							/* scale fake PWM out 900..2100 us to 0..1 for normal multirotors */
-							out[i] = (act->output[i] - PWM_LOWEST_MIN) / (PWM_HIGHEST_MAX - PWM_LOWEST_MIN);
+							out[i] = (act.output[i] - PWM_LOWEST_MIN) / (PWM_HIGHEST_MAX - PWM_LOWEST_MIN);
 
 						} else {
 							/* send 0 when disarmed */
@@ -846,12 +1108,12 @@ protected:
 				for (unsigned i = 0; i < 8; i++) {
 					if (i != 3) {
 						/* scale fake PWM out 900..2100 us to -1..+1 for normal channels */
-						out[i] = (act->output[i] - pwm_center) / ((PWM_HIGHEST_MAX - PWM_LOWEST_MIN) / 2);
+						out[i] = (act.output[i] - pwm_center) / ((PWM_HIGHEST_MAX - PWM_LOWEST_MIN) / 2);
 
 					} else {
 
 						/* scale fake PWM out 900..2100 us to 0..1 for throttle */
-						out[i] = (act->output[i] - PWM_LOWEST_MIN) / (PWM_HIGHEST_MAX - PWM_LOWEST_MIN);
+						out[i] = (act.output[i] - PWM_LOWEST_MIN) / (PWM_HIGHEST_MAX - PWM_LOWEST_MIN);
 					}
 
 				}
@@ -870,36 +1132,46 @@ protected:
 class MavlinkStreamGlobalPositionSetpointInt : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamGlobalPositionSetpointInt::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "GLOBAL_POSITION_SETPOINT_INT";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_GLOBAL_POSITION_SETPOINT_INT;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamGlobalPositionSetpointInt();
 	}
 
 private:
 	MavlinkOrbSubscription *pos_sp_triplet_sub;
-	struct position_setpoint_triplet_s *pos_sp_triplet;
 
 protected:
 	void subscribe(Mavlink *mavlink)
 	{
 		pos_sp_triplet_sub = mavlink->add_orb_subscription(ORB_ID(position_setpoint_triplet));
-		pos_sp_triplet = (struct position_setpoint_triplet_s *)pos_sp_triplet_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (pos_sp_triplet_sub->update(t)) {
+		struct position_setpoint_triplet_s pos_sp_triplet;
+
+		if (pos_sp_triplet_sub->update(&pos_sp_triplet)) {
 			mavlink_msg_global_position_setpoint_int_send(_channel,
 					MAV_FRAME_GLOBAL,
-					(int32_t)(pos_sp_triplet->current.lat * 1e7),
-					(int32_t)(pos_sp_triplet->current.lon * 1e7),
-					(int32_t)(pos_sp_triplet->current.alt * 1000),
-					(int16_t)(pos_sp_triplet->current.yaw * M_RAD_TO_DEG_F * 100.0f));
+					(int32_t)(pos_sp_triplet.current.lat * 1e7),
+					(int32_t)(pos_sp_triplet.current.lon * 1e7),
+					(int32_t)(pos_sp_triplet.current.alt * 1000),
+					(int16_t)(pos_sp_triplet.current.yaw * M_RAD_TO_DEG_F * 100.0f));
 		}
 	}
 };
@@ -908,36 +1180,51 @@ protected:
 class MavlinkStreamLocalPositionSetpoint : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamLocalPositionSetpoint::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "LOCAL_POSITION_SETPOINT";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_LOCAL_POSITION_SETPOINT;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamLocalPositionSetpoint();
 	}
 
 private:
 	MavlinkOrbSubscription *pos_sp_sub;
-	struct vehicle_local_position_setpoint_s *pos_sp;
+	uint64_t pos_sp_time;
 
 protected:
+	explicit MavlinkStreamLocalPositionSetpoint() : MavlinkStream(),
+		pos_sp_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		pos_sp_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_local_position_setpoint));
-		pos_sp = (struct vehicle_local_position_setpoint_s *)pos_sp_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (pos_sp_sub->update(t)) {
+		struct vehicle_local_position_setpoint_s pos_sp;
+
+		if (pos_sp_sub->update(&pos_sp_time, &pos_sp)) {
 			mavlink_msg_local_position_setpoint_send(_channel,
 					MAV_FRAME_LOCAL_NED,
-					pos_sp->x,
-					pos_sp->y,
-					pos_sp->z,
-					pos_sp->yaw);
+					pos_sp.x,
+					pos_sp.y,
+					pos_sp.z,
+					pos_sp.yaw);
 		}
 	}
 };
@@ -946,36 +1233,51 @@ protected:
 class MavlinkStreamRollPitchYawThrustSetpoint : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamRollPitchYawThrustSetpoint::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "ROLL_PITCH_YAW_THRUST_SETPOINT";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_ROLL_PITCH_YAW_THRUST_SETPOINT;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamRollPitchYawThrustSetpoint();
 	}
 
 private:
 	MavlinkOrbSubscription *att_sp_sub;
-	struct vehicle_attitude_setpoint_s *att_sp;
+	uint64_t att_sp_time;
 
 protected:
+	explicit MavlinkStreamRollPitchYawThrustSetpoint() : MavlinkStream(),
+		att_sp_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		att_sp_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_attitude_setpoint));
-		att_sp = (struct vehicle_attitude_setpoint_s *)att_sp_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (att_sp_sub->update(t)) {
+		struct vehicle_attitude_setpoint_s att_sp;
+
+		if (att_sp_sub->update(&att_sp_time, &att_sp)) {
 			mavlink_msg_roll_pitch_yaw_thrust_setpoint_send(_channel,
-					att_sp->timestamp / 1000,
-					att_sp->roll_body,
-					att_sp->pitch_body,
-					att_sp->yaw_body,
-					att_sp->thrust);
+					att_sp.timestamp / 1000,
+					att_sp.roll_body,
+					att_sp.pitch_body,
+					att_sp.yaw_body,
+					att_sp.thrust);
 		}
 	}
 };
@@ -984,36 +1286,51 @@ protected:
 class MavlinkStreamRollPitchYawRatesThrustSetpoint : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamRollPitchYawRatesThrustSetpoint::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "ROLL_PITCH_YAW_RATES_THRUST_SETPOINT";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_ROLL_PITCH_YAW_RATES_THRUST_SETPOINT;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamRollPitchYawRatesThrustSetpoint();
 	}
 
 private:
 	MavlinkOrbSubscription *att_rates_sp_sub;
-	struct vehicle_rates_setpoint_s *att_rates_sp;
+	uint64_t att_rates_sp_time;
 
 protected:
+	explicit MavlinkStreamRollPitchYawRatesThrustSetpoint() : MavlinkStream(),
+		att_rates_sp_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		att_rates_sp_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_rates_setpoint));
-		att_rates_sp = (struct vehicle_rates_setpoint_s *)att_rates_sp_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (att_rates_sp_sub->update(t)) {
+		struct vehicle_rates_setpoint_s att_rates_sp;
+
+		if (att_rates_sp_sub->update(&att_rates_sp_time, &att_rates_sp)) {
 			mavlink_msg_roll_pitch_yaw_rates_thrust_setpoint_send(_channel,
-					att_rates_sp->timestamp / 1000,
-					att_rates_sp->roll,
-					att_rates_sp->pitch,
-					att_rates_sp->yaw,
-					att_rates_sp->thrust);
+					att_rates_sp.timestamp / 1000,
+					att_rates_sp.roll,
+					att_rates_sp.pitch,
+					att_rates_sp.yaw,
+					att_rates_sp.thrust);
 		}
 	}
 };
@@ -1022,47 +1339,87 @@ protected:
 class MavlinkStreamRCChannelsRaw : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamRCChannelsRaw::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "RC_CHANNELS_RAW";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_RC_CHANNELS_RAW;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamRCChannelsRaw();
 	}
 
 private:
 	MavlinkOrbSubscription *rc_sub;
-	struct rc_input_values *rc;
+	uint64_t rc_time;
 
 protected:
+	explicit MavlinkStreamRCChannelsRaw() : MavlinkStream(),
+		rc_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		rc_sub = mavlink->add_orb_subscription(ORB_ID(input_rc));
-		rc = (struct rc_input_values *)rc_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (rc_sub->update(t)) {
+		struct rc_input_values rc;
+
+		if (rc_sub->update(&rc_time, &rc)) {
 			const unsigned port_width = 8;
 
-			for (unsigned i = 0; (i * port_width) < rc->channel_count; i++) {
+			// Deprecated message (but still needed for compatibility!)
+			for (unsigned i = 0; (i * port_width) < rc.channel_count; i++) {
 				/* Channels are sent in MAVLink main loop at a fixed interval */
 				mavlink_msg_rc_channels_raw_send(_channel,
-								 rc->timestamp_publication / 1000,
+								 rc.timestamp_publication / 1000,
 								 i,
-								 (rc->channel_count > (i * port_width) + 0) ? rc->values[(i * port_width) + 0] : UINT16_MAX,
-								 (rc->channel_count > (i * port_width) + 1) ? rc->values[(i * port_width) + 1] : UINT16_MAX,
-								 (rc->channel_count > (i * port_width) + 2) ? rc->values[(i * port_width) + 2] : UINT16_MAX,
-								 (rc->channel_count > (i * port_width) + 3) ? rc->values[(i * port_width) + 3] : UINT16_MAX,
-								 (rc->channel_count > (i * port_width) + 4) ? rc->values[(i * port_width) + 4] : UINT16_MAX,
-								 (rc->channel_count > (i * port_width) + 5) ? rc->values[(i * port_width) + 5] : UINT16_MAX,
-								 (rc->channel_count > (i * port_width) + 6) ? rc->values[(i * port_width) + 6] : UINT16_MAX,
-								 (rc->channel_count > (i * port_width) + 7) ? rc->values[(i * port_width) + 7] : UINT16_MAX,
-								 rc->rssi);
+								 (rc.channel_count > (i * port_width) + 0) ? rc.values[(i * port_width) + 0] : UINT16_MAX,
+								 (rc.channel_count > (i * port_width) + 1) ? rc.values[(i * port_width) + 1] : UINT16_MAX,
+								 (rc.channel_count > (i * port_width) + 2) ? rc.values[(i * port_width) + 2] : UINT16_MAX,
+								 (rc.channel_count > (i * port_width) + 3) ? rc.values[(i * port_width) + 3] : UINT16_MAX,
+								 (rc.channel_count > (i * port_width) + 4) ? rc.values[(i * port_width) + 4] : UINT16_MAX,
+								 (rc.channel_count > (i * port_width) + 5) ? rc.values[(i * port_width) + 5] : UINT16_MAX,
+								 (rc.channel_count > (i * port_width) + 6) ? rc.values[(i * port_width) + 6] : UINT16_MAX,
+								 (rc.channel_count > (i * port_width) + 7) ? rc.values[(i * port_width) + 7] : UINT16_MAX,
+								 rc.rssi);
 			}
+
+			// New message
+			mavlink_msg_rc_channels_send(_channel,
+					rc.timestamp_publication / 1000,
+					rc.channel_count,
+					((rc.channel_count > 0) ? rc.values[0] : UINT16_MAX),
+					((rc.channel_count > 1) ? rc.values[1] : UINT16_MAX),
+					((rc.channel_count > 2) ? rc.values[2] : UINT16_MAX),
+					((rc.channel_count > 3) ? rc.values[3] : UINT16_MAX),
+					((rc.channel_count > 4) ? rc.values[4] : UINT16_MAX),
+					((rc.channel_count > 5) ? rc.values[5] : UINT16_MAX),
+					((rc.channel_count > 6) ? rc.values[6] : UINT16_MAX),
+					((rc.channel_count > 7) ? rc.values[7] : UINT16_MAX),
+					((rc.channel_count > 8) ? rc.values[8] : UINT16_MAX),
+					((rc.channel_count > 9) ? rc.values[9] : UINT16_MAX),
+					((rc.channel_count > 10) ? rc.values[10] : UINT16_MAX),
+					((rc.channel_count > 11) ? rc.values[11] : UINT16_MAX),
+					((rc.channel_count > 12) ? rc.values[12] : UINT16_MAX),
+					((rc.channel_count > 13) ? rc.values[13] : UINT16_MAX),
+					((rc.channel_count > 14) ? rc.values[14] : UINT16_MAX),
+					((rc.channel_count > 15) ? rc.values[15] : UINT16_MAX),
+					((rc.channel_count > 16) ? rc.values[16] : UINT16_MAX),
+					((rc.channel_count > 17) ? rc.values[17] : UINT16_MAX),
+					rc.rssi);
 		}
 	}
 };
@@ -1071,36 +1428,51 @@ protected:
 class MavlinkStreamManualControl : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamManualControl::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "MANUAL_CONTROL";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_MANUAL_CONTROL;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamManualControl();
 	}
 
 private:
 	MavlinkOrbSubscription *manual_sub;
-	struct manual_control_setpoint_s *manual;
+	uint64_t manual_time;
 
 protected:
+	explicit MavlinkStreamManualControl() : MavlinkStream(),
+		manual_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		manual_sub = mavlink->add_orb_subscription(ORB_ID(manual_control_setpoint));
-		manual = (struct manual_control_setpoint_s *)manual_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (manual_sub->update(t)) {
+		struct manual_control_setpoint_s manual;
+
+		if (manual_sub->update(&manual_time, &manual)) {
 			mavlink_msg_manual_control_send(_channel,
 							mavlink_system.sysid,
-							manual->roll * 1000,
-							manual->pitch * 1000,
-							manual->yaw * 1000,
-							manual->throttle * 1000,
+							manual.x * 1000,
+							manual.y * 1000,
+							manual.z * 1000,
+							manual.r * 1000,
 							0);
 		}
 	}
@@ -1110,37 +1482,52 @@ protected:
 class MavlinkStreamOpticalFlow : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamOpticalFlow::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "OPTICAL_FLOW";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_OPTICAL_FLOW;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamOpticalFlow();
 	}
 
 private:
 	MavlinkOrbSubscription *flow_sub;
-	struct optical_flow_s *flow;
+	uint64_t flow_time;
 
 protected:
+	explicit MavlinkStreamOpticalFlow() : MavlinkStream(),
+		flow_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		flow_sub = mavlink->add_orb_subscription(ORB_ID(optical_flow));
-		flow = (struct optical_flow_s *)flow_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (flow_sub->update(t)) {
+		struct optical_flow_s flow;
+
+		if (flow_sub->update(&flow_time, &flow)) {
 			mavlink_msg_optical_flow_send(_channel,
-						      flow->timestamp,
-						      flow->sensor_id,
-						      flow->flow_raw_x, flow->flow_raw_y,
-						      flow->flow_comp_x_m, flow->flow_comp_y_m,
-						      flow->quality,
-						      flow->ground_distance_m);
+						      flow.timestamp,
+						      flow.sensor_id,
+						      flow.flow_raw_x, flow.flow_raw_y,
+						      flow.flow_comp_x_m, flow.flow_comp_y_m,
+						      flow.quality,
+						      flow.ground_distance_m);
 		}
 	}
 };
@@ -1148,47 +1535,62 @@ protected:
 class MavlinkStreamAttitudeControls : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamAttitudeControls::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "ATTITUDE_CONTROLS";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return 0;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamAttitudeControls();
 	}
 
 private:
 	MavlinkOrbSubscription *att_ctrl_sub;
-	struct actuator_controls_s *att_ctrl;
+	uint64_t att_ctrl_time;
 
 protected:
+	explicit MavlinkStreamAttitudeControls() : MavlinkStream(),
+		att_ctrl_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		att_ctrl_sub = mavlink->add_orb_subscription(ORB_ID_VEHICLE_ATTITUDE_CONTROLS);
-		att_ctrl = (struct actuator_controls_s *)att_ctrl_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (att_ctrl_sub->update(t)) {
+		struct actuator_controls_s att_ctrl;
+
+		if (att_ctrl_sub->update(&att_ctrl_time, &att_ctrl)) {
 			/* send, add spaces so that string buffer is at least 10 chars long */
 			mavlink_msg_named_value_float_send(_channel,
-							   att_ctrl->timestamp / 1000,
+							   att_ctrl.timestamp / 1000,
 							   "rll ctrl    ",
-							   att_ctrl->control[0]);
+							   att_ctrl.control[0]);
 			mavlink_msg_named_value_float_send(_channel,
-							   att_ctrl->timestamp / 1000,
+							   att_ctrl.timestamp / 1000,
 							   "ptch ctrl    ",
-							   att_ctrl->control[1]);
+							   att_ctrl.control[1]);
 			mavlink_msg_named_value_float_send(_channel,
-							   att_ctrl->timestamp / 1000,
+							   att_ctrl.timestamp / 1000,
 							   "yaw ctrl     ",
-							   att_ctrl->control[2]);
+							   att_ctrl.control[2]);
 			mavlink_msg_named_value_float_send(_channel,
-							   att_ctrl->timestamp / 1000,
+							   att_ctrl.timestamp / 1000,
 							   "thr ctrl     ",
-							   att_ctrl->control[3]);
+							   att_ctrl.control[3]);
 		}
 	}
 };
@@ -1196,37 +1598,52 @@ protected:
 class MavlinkStreamNamedValueFloat : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamNamedValueFloat::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "NAMED_VALUE_FLOAT";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_NAMED_VALUE_FLOAT;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamNamedValueFloat();
 	}
 
 private:
 	MavlinkOrbSubscription *debug_sub;
-	struct debug_key_value_s *debug;
+	uint64_t debug_time;
 
 protected:
+	explicit MavlinkStreamNamedValueFloat() : MavlinkStream(),
+		debug_time(0)
+	{}
+
 	void subscribe(Mavlink *mavlink)
 	{
 		debug_sub = mavlink->add_orb_subscription(ORB_ID(debug_key_value));
-		debug = (struct debug_key_value_s *)debug_sub->get_data();
 	}
 
 	void send(const hrt_abstime t)
 	{
-		if (debug_sub->update(t)) {
+		struct debug_key_value_s debug;
+
+		if (debug_sub->update(&debug_time, &debug)) {
 			/* enforce null termination */
-			debug->key[sizeof(debug->key) - 1] = '\0';
+			debug.key[sizeof(debug.key) - 1] = '\0';
 
 			mavlink_msg_named_value_float_send(_channel,
-							   debug->timestamp_ms,
-							   debug->key,
-							   debug->value);
+							   debug.timestamp_ms,
+							   debug.key,
+							   debug.value);
 		}
 	}
 };
@@ -1234,71 +1651,142 @@ protected:
 class MavlinkStreamCameraCapture : public MavlinkStream
 {
 public:
-	const char *get_name()
+	const char *get_name() const
+	{
+		return MavlinkStreamCameraCapture::get_name_static();
+	}
+
+	static const char *get_name_static()
 	{
 		return "CAMERA_CAPTURE";
 	}
 
-	MavlinkStream *new_instance()
+	uint8_t get_id()
+	{
+		return 0;
+	}
+
+	static MavlinkStream *new_instance()
 	{
 		return new MavlinkStreamCameraCapture();
 	}
 
 private:
 	MavlinkOrbSubscription *status_sub;
-	struct vehicle_status_s *status;
 
 protected:
 	void subscribe(Mavlink *mavlink)
 	{
 		status_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_status));
-		status = (struct vehicle_status_s *)status_sub->get_data();
-
-
 	}
 
 	void send(const hrt_abstime t)
 	{
-		(void)status_sub->update(t);
+		struct vehicle_status_s status;
+		(void)status_sub->update(&status);
 
-		if (status->arming_state == ARMING_STATE_ARMED
-		    || status->arming_state == ARMING_STATE_ARMED_ERROR) {
+		if (status.arming_state == ARMING_STATE_ARMED
+		    || status.arming_state == ARMING_STATE_ARMED_ERROR) {
 
 			/* send camera capture on */
-			mavlink_msg_command_long_send(_channel, 42, 30, MAV_CMD_DO_CONTROL_VIDEO, 0, 0, 0, 0, 1, 0, 0, 0);
+			mavlink_msg_command_long_send(_channel, mavlink_system.sysid, 0, MAV_CMD_DO_CONTROL_VIDEO, 0, 0, 0, 0, 1, 0, 0, 0);
 
 		} else {
 			/* send camera capture off */
-			mavlink_msg_command_long_send(_channel, 42, 30, MAV_CMD_DO_CONTROL_VIDEO, 0, 0, 0, 0, 0, 0, 0, 0);
+			mavlink_msg_command_long_send(_channel, mavlink_system.sysid, 0, MAV_CMD_DO_CONTROL_VIDEO, 0, 0, 0, 0, 0, 0, 0, 0);
 		}
 	}
 };
 
-MavlinkStream *streams_list[] = {
-	new MavlinkStreamHeartbeat(),
-	new MavlinkStreamSysStatus(),
-	new MavlinkStreamHighresIMU(),
-	new MavlinkStreamAttitude(),
-	new MavlinkStreamAttitudeQuaternion(),
-	new MavlinkStreamVFRHUD(),
-	new MavlinkStreamGPSRawInt(),
-	new MavlinkStreamGlobalPositionInt(),
-	new MavlinkStreamLocalPositionNED(),
-	new MavlinkStreamGPSGlobalOrigin(),
-	new MavlinkStreamServoOutputRaw(0),
-	new MavlinkStreamServoOutputRaw(1),
-	new MavlinkStreamServoOutputRaw(2),
-	new MavlinkStreamServoOutputRaw(3),
-	new MavlinkStreamHILControls(),
-	new MavlinkStreamGlobalPositionSetpointInt(),
-	new MavlinkStreamLocalPositionSetpoint(),
-	new MavlinkStreamRollPitchYawThrustSetpoint(),
-	new MavlinkStreamRollPitchYawRatesThrustSetpoint(),
-	new MavlinkStreamRCChannelsRaw(),
-	new MavlinkStreamManualControl(),
-	new MavlinkStreamOpticalFlow(),
-	new MavlinkStreamAttitudeControls(),
-	new MavlinkStreamNamedValueFloat(),
-	new MavlinkStreamCameraCapture(),
+class MavlinkStreamDistanceSensor : public MavlinkStream
+{
+public:
+	const char *get_name() const
+	{
+		return MavlinkStreamDistanceSensor::get_name_static();
+	}
+
+	static const char *get_name_static()
+	{
+		return "DISTANCE_SENSOR";
+	}
+
+	uint8_t get_id()
+	{
+		return MAVLINK_MSG_ID_DISTANCE_SENSOR;
+	}
+
+	static MavlinkStream *new_instance()
+	{
+		return new MavlinkStreamDistanceSensor();
+	}
+
+private:
+	MavlinkOrbSubscription *range_sub;
+	uint64_t range_time;
+
+protected:
+	explicit MavlinkStreamDistanceSensor() : MavlinkStream(),
+		range_time(0)
+	{}
+
+	void subscribe(Mavlink *mavlink)
+	{
+		range_sub = mavlink->add_orb_subscription(ORB_ID(sensor_range_finder));
+	}
+
+	void send(const hrt_abstime t)
+	{
+		struct range_finder_report range;
+
+		if (range_sub->update(&range_time, &range)) {
+
+			uint8_t type;
+
+			switch (range.type) {
+				case RANGE_FINDER_TYPE_LASER:
+				type = MAV_DISTANCE_SENSOR_LASER;
+				break;
+			}
+
+			uint8_t id = 0;
+			uint8_t orientation = 0;
+			uint8_t covariance = 20;
+
+			mavlink_msg_distance_sensor_send(_channel, range.timestamp / 1000, type, id, orientation,
+				range.minimum_distance*100, range.maximum_distance*100, range.distance*100, covariance);
+		}
+	}
+};
+
+
+StreamListItem *streams_list[] = {
+	new StreamListItem(&MavlinkStreamHeartbeat::new_instance, &MavlinkStreamHeartbeat::get_name_static),
+	new StreamListItem(&MavlinkStreamSysStatus::new_instance, &MavlinkStreamSysStatus::get_name_static),
+	new StreamListItem(&MavlinkStreamHighresIMU::new_instance, &MavlinkStreamHighresIMU::get_name_static),
+	new StreamListItem(&MavlinkStreamAttitude::new_instance, &MavlinkStreamAttitude::get_name_static),
+	new StreamListItem(&MavlinkStreamAttitudeQuaternion::new_instance, &MavlinkStreamAttitudeQuaternion::get_name_static),
+	new StreamListItem(&MavlinkStreamVFRHUD::new_instance, &MavlinkStreamVFRHUD::get_name_static),
+	new StreamListItem(&MavlinkStreamGPSRawInt::new_instance, &MavlinkStreamGPSRawInt::get_name_static),
+	new StreamListItem(&MavlinkStreamGlobalPositionInt::new_instance, &MavlinkStreamGlobalPositionInt::get_name_static),
+	new StreamListItem(&MavlinkStreamLocalPositionNED::new_instance, &MavlinkStreamLocalPositionNED::get_name_static),
+	new StreamListItem(&MavlinkStreamGPSGlobalOrigin::new_instance, &MavlinkStreamGPSGlobalOrigin::get_name_static),
+	new StreamListItem(&MavlinkStreamServoOutputRaw<0>::new_instance, &MavlinkStreamServoOutputRaw<0>::get_name_static),
+	new StreamListItem(&MavlinkStreamServoOutputRaw<1>::new_instance, &MavlinkStreamServoOutputRaw<1>::get_name_static),
+	new StreamListItem(&MavlinkStreamServoOutputRaw<2>::new_instance, &MavlinkStreamServoOutputRaw<2>::get_name_static),
+	new StreamListItem(&MavlinkStreamServoOutputRaw<3>::new_instance, &MavlinkStreamServoOutputRaw<3>::get_name_static),
+	new StreamListItem(&MavlinkStreamHILControls::new_instance, &MavlinkStreamHILControls::get_name_static),
+	new StreamListItem(&MavlinkStreamGlobalPositionSetpointInt::new_instance, &MavlinkStreamGlobalPositionSetpointInt::get_name_static),
+	new StreamListItem(&MavlinkStreamLocalPositionSetpoint::new_instance, &MavlinkStreamLocalPositionSetpoint::get_name_static),
+	new StreamListItem(&MavlinkStreamRollPitchYawThrustSetpoint::new_instance, &MavlinkStreamRollPitchYawThrustSetpoint::get_name_static),
+	new StreamListItem(&MavlinkStreamRollPitchYawRatesThrustSetpoint::new_instance, &MavlinkStreamRollPitchYawRatesThrustSetpoint::get_name_static),
+	new StreamListItem(&MavlinkStreamRCChannelsRaw::new_instance, &MavlinkStreamRCChannelsRaw::get_name_static),
+	new StreamListItem(&MavlinkStreamManualControl::new_instance, &MavlinkStreamManualControl::get_name_static),
+	new StreamListItem(&MavlinkStreamOpticalFlow::new_instance, &MavlinkStreamOpticalFlow::get_name_static),
+	new StreamListItem(&MavlinkStreamAttitudeControls::new_instance, &MavlinkStreamAttitudeControls::get_name_static),
+	new StreamListItem(&MavlinkStreamNamedValueFloat::new_instance, &MavlinkStreamNamedValueFloat::get_name_static),
+	new StreamListItem(&MavlinkStreamCameraCapture::new_instance, &MavlinkStreamCameraCapture::get_name_static),
+	new StreamListItem(&MavlinkStreamDistanceSensor::new_instance, &MavlinkStreamDistanceSensor::get_name_static),
+	new StreamListItem(&MavlinkStreamViconPositionEstimate::new_instance, &MavlinkStreamViconPositionEstimate::get_name_static),
 	nullptr
 };
diff --git a/src/modules/mavlink/mavlink_messages.h b/src/modules/mavlink/mavlink_messages.h
index b8823263a..ee64d0e42 100644
--- a/src/modules/mavlink/mavlink_messages.h
+++ b/src/modules/mavlink/mavlink_messages.h
@@ -43,6 +43,19 @@
 
 #include "mavlink_stream.h"
 
-extern MavlinkStream *streams_list[];
+class StreamListItem {
+
+public:
+	MavlinkStream* (*new_instance)();
+	const char* (*get_name)();
+
+	StreamListItem(MavlinkStream* (*inst)(), const char* (*name)()) :
+		new_instance(inst),
+		get_name(name) {};
+
+	~StreamListItem() {};
+};
+
+extern StreamListItem *streams_list[];
 
 #endif /* MAVLINK_MESSAGES_H_ */
diff --git a/src/modules/mavlink/mavlink_orb_subscription.cpp b/src/modules/mavlink/mavlink_orb_subscription.cpp
index d432edd2b..734f0903a 100644
--- a/src/modules/mavlink/mavlink_orb_subscription.cpp
+++ b/src/modules/mavlink/mavlink_orb_subscription.cpp
@@ -47,53 +47,58 @@
 #include "mavlink_orb_subscription.h"
 
 MavlinkOrbSubscription::MavlinkOrbSubscription(const orb_id_t topic) :
-	_fd(orb_subscribe(_topic)),
-	_published(false),
+	next(nullptr),
 	_topic(topic),
-	_last_check(0),
-	next(nullptr)
+	_fd(orb_subscribe(_topic)),
+	_published(false)
 {
-	_data = malloc(topic->o_size);
-	memset(_data, 0, topic->o_size);
 }
 
 MavlinkOrbSubscription::~MavlinkOrbSubscription()
 {
 	close(_fd);
-	free(_data);
 }
 
-const orb_id_t
-MavlinkOrbSubscription::get_topic()
+orb_id_t
+MavlinkOrbSubscription::get_topic() const
 {
 	return _topic;
 }
 
-void *
-MavlinkOrbSubscription::get_data()
-{
-	return _data;
-}
-
 bool
-MavlinkOrbSubscription::update(const hrt_abstime t)
+MavlinkOrbSubscription::update(uint64_t *time, void* data)
 {
-	if (_last_check == t) {
-		/* already checked right now, return result of the check */
-		return _updated;
+	// TODO this is NOT atomic operation, we can get data newer than time
+	// if topic was published between orb_stat and orb_copy calls.
 
-	} else {
-		_last_check = t;
-		orb_check(_fd, &_updated);
+	uint64_t time_topic;
+	if (orb_stat(_fd, &time_topic)) {
+		/* error getting last topic publication time */
+		time_topic = 0;
+	}
 
-		if (_updated) {
-			orb_copy(_topic, _fd, _data);
-			_published = true;
+	if (orb_copy(_topic, _fd, data)) {
+		/* error copying topic data */
+		memset(data, 0, _topic->o_size);
+		return false;
+
+	} else {
+		/* data copied successfully */
+		_published = true;
+		if (time_topic != *time) {
+			*time = time_topic;
 			return true;
+
+		} else {
+			return false;
 		}
 	}
+}
 
-	return false;
+bool
+MavlinkOrbSubscription::update(void* data)
+{
+	return !orb_copy(_topic, _fd, data);
 }
 
 bool
diff --git a/src/modules/mavlink/mavlink_orb_subscription.h b/src/modules/mavlink/mavlink_orb_subscription.h
index 5c6543e81..71efb43af 100644
--- a/src/modules/mavlink/mavlink_orb_subscription.h
+++ b/src/modules/mavlink/mavlink_orb_subscription.h
@@ -48,12 +48,26 @@
 class MavlinkOrbSubscription
 {
 public:
-	MavlinkOrbSubscription *next;	/*< pointer to next subscription in list */
+	MavlinkOrbSubscription *next;	///< pointer to next subscription in list
 
 	MavlinkOrbSubscription(const orb_id_t topic);
 	~MavlinkOrbSubscription();
 
-	bool update(const hrt_abstime t);
+	/**
+	 * Check if subscription updated and get data.
+	 *
+	 * @return true only if topic was updated and data copied to buffer successfully.
+	 * If topic was not updated since last check it will return false but still copy the data.
+	 * If no data available data buffer will be filled with zeroes.
+	 */
+	bool update(uint64_t *time, void* data);
+
+	/**
+	 * Copy topic data to given buffer.
+	 *
+	 * @return true only if topic data copied successfully.
+	 */
+	bool update(void* data);
 
 	/**
 	 * Check if the topic has been published.
@@ -62,16 +76,12 @@ public:
 	 * @return true if the topic has been published at least once.
 	 */
 	bool is_published();
-	void *get_data();
-	const orb_id_t get_topic();
+	orb_id_t get_topic() const;
 
 private:
-	const orb_id_t _topic;		/*< topic metadata */
-	int _fd;					/*< subscription handle */
-	bool _published;			/*< topic was ever published */
-	void *_data;				/*< pointer to data buffer */
-	hrt_abstime _last_check;	/*< time of last check */
-	bool _updated;				/*< updated on last check */
+	const orb_id_t _topic;		///< topic metadata
+	int _fd;			///< subscription handle
+	bool _published;		///< topic was ever published
 };
 
 
diff --git a/src/modules/mavlink/mavlink_receiver.cpp b/src/modules/mavlink/mavlink_receiver.cpp
index d7e300670..bb977d277 100644
--- a/src/modules/mavlink/mavlink_receiver.cpp
+++ b/src/modules/mavlink/mavlink_receiver.cpp
@@ -88,8 +88,6 @@ static const float mg2ms2 = CONSTANTS_ONE_G / 1000.0f;
 MavlinkReceiver::MavlinkReceiver(Mavlink *parent) :
 	_mavlink(parent),
 
-	_manual_sub(-1),
-
 	_global_pos_pub(-1),
 	_local_pos_pub(-1),
 	_attitude_pub(-1),
@@ -108,12 +106,17 @@ MavlinkReceiver::MavlinkReceiver(Mavlink *parent) :
 	_telemetry_status_pub(-1),
 	_rc_pub(-1),
 	_manual_pub(-1),
+	_telemetry_heartbeat_time(0),
+	_radio_status_available(false),
 	_hil_frames(0),
 	_old_timestamp(0),
 	_hil_local_proj_inited(0),
 	_hil_local_alt0(0.0)
 {
 	memset(&hil_local_pos, 0, sizeof(hil_local_pos));
+
+	// make sure the FTP server is started
+	(void)MavlinkFTP::getServer();
 }
 
 MavlinkReceiver::~MavlinkReceiver()
@@ -152,6 +155,18 @@ MavlinkReceiver::handle_message(mavlink_message_t *msg)
 		handle_message_manual_control(msg);
 		break;
 
+	case MAVLINK_MSG_ID_HEARTBEAT:
+		handle_message_heartbeat(msg);
+		break;
+
+	case MAVLINK_MSG_ID_REQUEST_DATA_STREAM:
+		handle_message_request_data_stream(msg);
+		break;
+
+	case MAVLINK_MSG_ID_ENCAPSULATED_DATA:
+		MavlinkFTP::getServer()->handle_message(_mavlink, msg);
+		break;
+
 	default:
 		break;
 	}
@@ -162,6 +177,9 @@ MavlinkReceiver::handle_message(mavlink_message_t *msg)
 	 * The HIL mode is enabled by the HIL bit flag
 	 * in the system mode. Either send a set mode
 	 * COMMAND_LONG message or a SET_MODE message
+	 *
+	 * Accept HIL GPS messages if use_hil_gps flag is true.
+	 * This allows to provide fake gps measurements to the system.
 	 */
 	if (_mavlink->get_hil_enabled()) {
 		switch (msg->msgid) {
@@ -169,10 +187,6 @@ MavlinkReceiver::handle_message(mavlink_message_t *msg)
 			handle_message_hil_sensor(msg);
 			break;
 
-		case MAVLINK_MSG_ID_HIL_GPS:
-			handle_message_hil_gps(msg);
-			break;
-
 		case MAVLINK_MSG_ID_HIL_STATE_QUATERNION:
 			handle_message_hil_state_quaternion(msg);
 			break;
@@ -181,6 +195,23 @@ MavlinkReceiver::handle_message(mavlink_message_t *msg)
 			break;
 		}
 	}
+
+
+   	if (_mavlink->get_hil_enabled() || (_mavlink->get_use_hil_gps() && msg->sysid == mavlink_system.sysid)) {
+		switch (msg->msgid) {
+		case MAVLINK_MSG_ID_HIL_GPS:
+			handle_message_hil_gps(msg);
+			break;
+
+		default:
+			break;
+		}
+
+	}
+
+    /* If we've received a valid message, mark the flag indicating so.
+	   This is used in the '-w' command-line flag. */
+	_mavlink->set_has_received_messages(true);
 }
 
 void
@@ -203,6 +234,12 @@ MavlinkReceiver::handle_message_command_long(mavlink_message_t *msg)
 			_mavlink->_task_should_exit = true;
 
 		} else {
+
+			if (msg->sysid == mavlink_system.sysid && msg->compid == mavlink_system.compid) {
+				warnx("ignoring CMD spoofed with same SYS/COMP ID");
+				return;
+			}
+
 			struct vehicle_command_s vcmd;
 			memset(&vcmd, 0, sizeof(vcmd));
 
@@ -222,12 +259,10 @@ MavlinkReceiver::handle_message_command_long(mavlink_message_t *msg)
 			vcmd.source_component = msg->compid;
 			vcmd.confirmation =  cmd_mavlink.confirmation;
 
-			/* check if topic is advertised */
-			if (_cmd_pub <= 0) {
+			if (_cmd_pub < 0) {
 				_cmd_pub = orb_advertise(ORB_ID(vehicle_command), &vcmd);
 
 			} else {
-				/* publish */
 				orb_publish(ORB_ID(vehicle_command), _cmd_pub, &vcmd);
 			}
 		}
@@ -245,6 +280,7 @@ MavlinkReceiver::handle_message_optical_flow(mavlink_message_t *msg)
 	memset(&f, 0, sizeof(f));
 
 	f.timestamp = hrt_absolute_time();
+	f.flow_timestamp = flow.time_usec;
 	f.flow_raw_x = flow.flow_x;
 	f.flow_raw_y = flow.flow_y;
 	f.flow_comp_x_m = flow.flow_comp_m_x;
@@ -253,7 +289,7 @@ MavlinkReceiver::handle_message_optical_flow(mavlink_message_t *msg)
 	f.quality = flow.quality;
 	f.sensor_id = flow.sensor_id;
 
-	if (_flow_pub <= 0) {
+	if (_flow_pub < 0) {
 		_flow_pub = orb_advertise(ORB_ID(optical_flow), &f);
 
 	} else {
@@ -287,7 +323,7 @@ MavlinkReceiver::handle_message_set_mode(mavlink_message_t *msg)
 	vcmd.source_component = msg->compid;
 	vcmd.confirmation = 1;
 
-	if (_cmd_pub <= 0) {
+	if (_cmd_pub < 0) {
 		_cmd_pub = orb_advertise(ORB_ID(vehicle_command), &vcmd);
 
 	} else {
@@ -312,7 +348,7 @@ MavlinkReceiver::handle_message_vicon_position_estimate(mavlink_message_t *msg)
 	vicon_position.pitch = pos.pitch;
 	vicon_position.yaw = pos.yaw;
 
-	if (_vicon_position_pub <= 0) {
+	if (_vicon_position_pub < 0) {
 		_vicon_position_pub = orb_advertise(ORB_ID(vehicle_vicon_position), &vicon_position);
 
 	} else {
@@ -373,7 +409,7 @@ MavlinkReceiver::handle_message_quad_swarm_roll_pitch_yaw_thrust(mavlink_message
 
 		offboard_control_sp.timestamp = hrt_absolute_time();
 
-		if (_offboard_control_sp_pub <= 0) {
+		if (_offboard_control_sp_pub < 0) {
 			_offboard_control_sp_pub = orb_advertise(ORB_ID(offboard_control_setpoint), &offboard_control_sp);
 
 		} else {
@@ -392,6 +428,7 @@ MavlinkReceiver::handle_message_radio_status(mavlink_message_t *msg)
 	memset(&tstatus, 0, sizeof(tstatus));
 
 	tstatus.timestamp = hrt_absolute_time();
+	tstatus.heartbeat_time = _telemetry_heartbeat_time;
 	tstatus.type = TELEMETRY_STATUS_RADIO_TYPE_3DR_RADIO;
 	tstatus.rssi = rstatus.rssi;
 	tstatus.remote_rssi = rstatus.remrssi;
@@ -401,12 +438,15 @@ MavlinkReceiver::handle_message_radio_status(mavlink_message_t *msg)
 	tstatus.rxerrors = rstatus.rxerrors;
 	tstatus.fixed = rstatus.fixed;
 
-	if (_telemetry_status_pub <= 0) {
+	if (_telemetry_status_pub < 0) {
 		_telemetry_status_pub = orb_advertise(ORB_ID(telemetry_status), &tstatus);
 
 	} else {
 		orb_publish(ORB_ID(telemetry_status), _telemetry_status_pub, &tstatus);
 	}
+
+	/* this means that heartbeats alone won't be published to the radio status no more */
+	_radio_status_available = true;
 }
 
 void
@@ -415,46 +455,67 @@ MavlinkReceiver::handle_message_manual_control(mavlink_message_t *msg)
 	mavlink_manual_control_t man;
 	mavlink_msg_manual_control_decode(msg, &man);
 
-	/* rc channels */
-	{
-		struct rc_channels_s rc;
-		memset(&rc, 0, sizeof(rc));
+	struct manual_control_setpoint_s manual;
+	memset(&manual, 0, sizeof(manual));
 
-		rc.timestamp = hrt_absolute_time();
-		rc.chan_count = 4;
+	manual.timestamp = hrt_absolute_time();
+	manual.x = man.x / 1000.0f;
+	manual.y = man.y / 1000.0f;
+	manual.r = man.r / 1000.0f;
+	manual.z = man.z / 1000.0f;
 
-		rc.chan[0].scaled = man.x / 1000.0f;
-		rc.chan[1].scaled = man.y / 1000.0f;
-		rc.chan[2].scaled = man.r / 1000.0f;
-		rc.chan[3].scaled = man.z / 1000.0f;
+	if (_manual_pub < 0) {
+		_manual_pub = orb_advertise(ORB_ID(manual_control_setpoint), &manual);
 
-		if (_rc_pub == 0) {
-			_rc_pub = orb_advertise(ORB_ID(rc_channels), &rc);
-
-		} else {
-			orb_publish(ORB_ID(rc_channels), _rc_pub, &rc);
-		}
+	} else {
+		orb_publish(ORB_ID(manual_control_setpoint), _manual_pub, &manual);
 	}
+}
 
-	/* manual control */
-	{
-		struct manual_control_setpoint_s manual;
-		memset(&manual, 0, sizeof(manual));
+void
+MavlinkReceiver::handle_message_heartbeat(mavlink_message_t *msg)
+{
+	mavlink_heartbeat_t hb;
+	mavlink_msg_heartbeat_decode(msg, &hb);
 
-		/* get a copy first, to prevent altering values that are not sent by the mavlink command */
-		orb_copy(ORB_ID(manual_control_setpoint), _manual_sub, &manual);
+	/* ignore own heartbeats, accept only heartbeats from GCS */
+	if (msg->sysid != mavlink_system.sysid && hb.type == MAV_TYPE_GCS) {
+		_telemetry_heartbeat_time = hrt_absolute_time();
 
-		manual.timestamp = hrt_absolute_time();
-		manual.roll = man.x / 1000.0f;
-		manual.pitch = man.y / 1000.0f;
-		manual.yaw = man.r / 1000.0f;
-		manual.throttle = man.z / 1000.0f;
+		/* if no radio status messages arrive, lets at least publish that heartbeats were received */
+		if (!_radio_status_available) {
 
-		if (_manual_pub == 0) {
-			_manual_pub = orb_advertise(ORB_ID(manual_control_setpoint), &manual);
+			struct telemetry_status_s tstatus;
+			memset(&tstatus, 0, sizeof(tstatus));
 
-		} else {
-			orb_publish(ORB_ID(manual_control_setpoint), _manual_pub, &manual);
+			tstatus.timestamp = _telemetry_heartbeat_time;
+			tstatus.heartbeat_time = _telemetry_heartbeat_time;
+			tstatus.type = TELEMETRY_STATUS_RADIO_TYPE_GENERIC;
+
+			if (_telemetry_status_pub < 0) {
+				_telemetry_status_pub = orb_advertise(ORB_ID(telemetry_status), &tstatus);
+
+			} else {
+				orb_publish(ORB_ID(telemetry_status), _telemetry_status_pub, &tstatus);
+			}
+		}
+	}
+}
+
+void
+MavlinkReceiver::handle_message_request_data_stream(mavlink_message_t *msg)
+{
+	mavlink_request_data_stream_t req;
+	mavlink_msg_request_data_stream_decode(msg, &req);
+
+	if (req.target_system == mavlink_system.sysid && req.target_component == mavlink_system.compid) {
+		float rate = req.start_stop ? (1000.0f / req.req_message_rate) : 0.0f;
+
+		MavlinkStream *stream;
+		LL_FOREACH(_mavlink->get_streams(), stream) {
+			if (req.req_stream_id == stream->get_id()) {
+				_mavlink->configure_stream_threadsafe(stream->get_name(), rate);
+			}
 		}
 	}
 }
@@ -619,11 +680,11 @@ MavlinkReceiver::handle_message_hil_sensor(mavlink_message_t *msg)
 		hil_sensors.differential_pressure_timestamp = timestamp;
 
 		/* publish combined sensor topic */
-		if (_sensors_pub > 0) {
-			orb_publish(ORB_ID(sensor_combined), _sensors_pub, &hil_sensors);
+		if (_sensors_pub < 0) {
+			_sensors_pub = orb_advertise(ORB_ID(sensor_combined), &hil_sensors);
 
 		} else {
-			_sensors_pub = orb_advertise(ORB_ID(sensor_combined), &hil_sensors);
+			orb_publish(ORB_ID(sensor_combined), _sensors_pub, &hil_sensors);
 		}
 	}
 
@@ -638,11 +699,11 @@ MavlinkReceiver::handle_message_hil_sensor(mavlink_message_t *msg)
 		hil_battery_status.current_a = 10.0f;
 		hil_battery_status.discharged_mah = -1.0f;
 
-		if (_battery_pub > 0) {
-			orb_publish(ORB_ID(battery_status), _battery_pub, &hil_battery_status);
+		if (_battery_pub < 0) {
+			_battery_pub = orb_advertise(ORB_ID(battery_status), &hil_battery_status);
 
 		} else {
-			_battery_pub = orb_advertise(ORB_ID(battery_status), &hil_battery_status);
+			orb_publish(ORB_ID(battery_status), _battery_pub, &hil_battery_status);
 		}
 	}
 
@@ -675,12 +736,12 @@ MavlinkReceiver::handle_message_hil_gps(mavlink_message_t *msg)
 	hil_gps.lat = gps.lat;
 	hil_gps.lon = gps.lon;
 	hil_gps.alt = gps.alt;
-	hil_gps.eph_m = (float)gps.eph * 1e-2f; // from cm to m
-	hil_gps.epv_m = (float)gps.epv * 1e-2f; // from cm to m
+	hil_gps.eph = (float)gps.eph * 1e-2f; // from cm to m
+	hil_gps.epv = (float)gps.epv * 1e-2f; // from cm to m
 
 	hil_gps.timestamp_variance = timestamp;
 	hil_gps.s_variance_m_s = 5.0f;
-	hil_gps.p_variance_m = hil_gps.eph_m * hil_gps.eph_m;
+	hil_gps.p_variance_m = hil_gps.eph * hil_gps.eph;
 
 	hil_gps.timestamp_velocity = timestamp;
 	hil_gps.vel_m_s = (float)gps.vel * 1e-2f; // from cm/s to m/s
@@ -694,11 +755,11 @@ MavlinkReceiver::handle_message_hil_gps(mavlink_message_t *msg)
 	hil_gps.fix_type = gps.fix_type;
 	hil_gps.satellites_visible = gps.satellites_visible;
 
-	if (_gps_pub > 0) {
-		orb_publish(ORB_ID(vehicle_gps_position), _gps_pub, &hil_gps);
+	if (_gps_pub < 0) {
+		_gps_pub = orb_advertise(ORB_ID(vehicle_gps_position), &hil_gps);
 
 	} else {
-		_gps_pub = orb_advertise(ORB_ID(vehicle_gps_position), &hil_gps);
+		orb_publish(ORB_ID(vehicle_gps_position), _gps_pub, &hil_gps);
 	}
 }
 
@@ -752,11 +813,11 @@ MavlinkReceiver::handle_message_hil_state_quaternion(mavlink_message_t *msg)
 		hil_attitude.pitchspeed = hil_state.pitchspeed;
 		hil_attitude.yawspeed = hil_state.yawspeed;
 
-		if (_attitude_pub > 0) {
-			orb_publish(ORB_ID(vehicle_attitude), _attitude_pub, &hil_attitude);
+		if (_attitude_pub < 0) {
+			_attitude_pub = orb_advertise(ORB_ID(vehicle_attitude), &hil_attitude);
 
 		} else {
-			_attitude_pub = orb_advertise(ORB_ID(vehicle_attitude), &hil_attitude);
+			orb_publish(ORB_ID(vehicle_attitude), _attitude_pub, &hil_attitude);
 		}
 	}
 
@@ -766,7 +827,6 @@ MavlinkReceiver::handle_message_hil_state_quaternion(mavlink_message_t *msg)
 		memset(&hil_global_pos, 0, sizeof(hil_global_pos));
 
 		hil_global_pos.timestamp = timestamp;
-		hil_global_pos.global_valid = true;
 		hil_global_pos.lat = hil_state.lat;
 		hil_global_pos.lon = hil_state.lon;
 		hil_global_pos.alt = hil_state.alt / 1000.0f;
@@ -774,30 +834,35 @@ MavlinkReceiver::handle_message_hil_state_quaternion(mavlink_message_t *msg)
 		hil_global_pos.vel_e = hil_state.vy / 100.0f;
 		hil_global_pos.vel_d = hil_state.vz / 100.0f;
 		hil_global_pos.yaw = hil_attitude.yaw;
+		hil_global_pos.eph = 2.0f;
+		hil_global_pos.epv = 4.0f;
 
-		if (_global_pos_pub > 0) {
-			orb_publish(ORB_ID(vehicle_global_position), _global_pos_pub, &hil_global_pos);
+		if (_global_pos_pub < 0) {
+			_global_pos_pub = orb_advertise(ORB_ID(vehicle_global_position), &hil_global_pos);
 
 		} else {
-			_global_pos_pub = orb_advertise(ORB_ID(vehicle_global_position), &hil_global_pos);
+			orb_publish(ORB_ID(vehicle_global_position), _global_pos_pub, &hil_global_pos);
 		}
 	}
 
 	/* local position */
 	{
+		double lat = hil_state.lat * 1e-7;
+		double lon = hil_state.lon * 1e-7;
+
 		if (!_hil_local_proj_inited) {
 			_hil_local_proj_inited = true;
 			_hil_local_alt0 = hil_state.alt / 1000.0f;
-			map_projection_init(hil_state.lat, hil_state.lon);
+			map_projection_init(&_hil_local_proj_ref, hil_state.lat, hil_state.lon);
 			hil_local_pos.ref_timestamp = timestamp;
-			hil_local_pos.ref_lat = hil_state.lat;
-			hil_local_pos.ref_lon = hil_state.lon;
+			hil_local_pos.ref_lat = lat;
+			hil_local_pos.ref_lon = lon;
 			hil_local_pos.ref_alt = _hil_local_alt0;
 		}
 
 		float x;
 		float y;
-		map_projection_project(hil_state.lat * 1e-7, hil_state.lon * 1e-7, &x, &y);
+		map_projection_project(&_hil_local_proj_ref, lat, lon, &x, &y);
 		hil_local_pos.timestamp = timestamp;
 		hil_local_pos.xy_valid = true;
 		hil_local_pos.z_valid = true;
@@ -816,11 +881,11 @@ MavlinkReceiver::handle_message_hil_state_quaternion(mavlink_message_t *msg)
 		bool landed = (float)(hil_state.alt) / 1000.0f < (_hil_local_alt0 + 0.1f); // XXX improve?
 		hil_local_pos.landed = landed;
 
-		if (_local_pos_pub > 0) {
-			orb_publish(ORB_ID(vehicle_local_position), _local_pos_pub, &hil_local_pos);
+		if (_local_pos_pub < 0) {
+			_local_pos_pub = orb_advertise(ORB_ID(vehicle_local_position), &hil_local_pos);
 
 		} else {
-			_local_pos_pub = orb_advertise(ORB_ID(vehicle_local_position), &hil_local_pos);
+			orb_publish(ORB_ID(vehicle_local_position), _local_pos_pub, &hil_local_pos);
 		}
 	}
 
@@ -857,11 +922,11 @@ MavlinkReceiver::handle_message_hil_state_quaternion(mavlink_message_t *msg)
 		hil_battery_status.current_a = 10.0f;
 		hil_battery_status.discharged_mah = -1.0f;
 
-		if (_battery_pub > 0) {
-			orb_publish(ORB_ID(battery_status), _battery_pub, &hil_battery_status);
+		if (_battery_pub < 0) {
+			_battery_pub = orb_advertise(ORB_ID(battery_status), &hil_battery_status);
 
 		} else {
-			_battery_pub = orb_advertise(ORB_ID(battery_status), &hil_battery_status);
+			orb_publish(ORB_ID(battery_status), _battery_pub, &hil_battery_status);
 		}
 	}
 }
@@ -885,8 +950,6 @@ MavlinkReceiver::receive_thread(void *arg)
 	sprintf(thread_name, "mavlink_rcv_if%d", _mavlink->get_instance_id());
 	prctl(PR_SET_NAME, thread_name, getpid());
 
-	_manual_sub = orb_subscribe(ORB_ID(manual_control_setpoint));
-
 	struct pollfd fds[1];
 	fds[0].fd = uart_fd;
 	fds[0].events = POLLIN;
@@ -913,6 +976,11 @@ MavlinkReceiver::receive_thread(void *arg)
 
 					/* handle packet with parameter component */
 					_mavlink->mavlink_pm_message_handler(_mavlink->get_channel(), &msg);
+
+					if (_mavlink->get_forwarding_on()) {
+						/* forward any messages to other mavlink instances */
+						Mavlink::forward_message(&msg, _mavlink);
+					}
 				}
 			}
 		}
@@ -933,6 +1001,8 @@ void *MavlinkReceiver::start_helper(void *context)
 	rcv->receive_thread(NULL);
 
 	delete rcv;
+
+	return nullptr;
 }
 
 pthread_t
@@ -950,8 +1020,7 @@ MavlinkReceiver::receive_start(Mavlink *parent)
 	param.sched_priority = SCHED_PRIORITY_MAX - 40;
 	(void)pthread_attr_setschedparam(&receiveloop_attr, &param);
 
-	pthread_attr_setstacksize(&receiveloop_attr, 3000);
-
+	pthread_attr_setstacksize(&receiveloop_attr, 2900);
 	pthread_t thread;
 	pthread_create(&thread, &receiveloop_attr, MavlinkReceiver::start_helper, (void *)parent);
 
diff --git a/src/modules/mavlink/mavlink_receiver.h b/src/modules/mavlink/mavlink_receiver.h
index 0a5a1b5c7..040a07480 100644
--- a/src/modules/mavlink/mavlink_receiver.h
+++ b/src/modules/mavlink/mavlink_receiver.h
@@ -68,6 +68,8 @@
 #include <uORB/topics/airspeed.h>
 #include <uORB/topics/battery_status.h>
 
+#include "mavlink_ftp.h"
+
 class Mavlink;
 
 class MavlinkReceiver
@@ -112,6 +114,8 @@ private:
 	void handle_message_quad_swarm_roll_pitch_yaw_thrust(mavlink_message_t *msg);
 	void handle_message_radio_status(mavlink_message_t *msg);
 	void handle_message_manual_control(mavlink_message_t *msg);
+	void handle_message_heartbeat(mavlink_message_t *msg);
+	void handle_message_request_data_stream(mavlink_message_t *msg);
 	void handle_message_hil_sensor(mavlink_message_t *msg);
 	void handle_message_hil_gps(mavlink_message_t *msg);
 	void handle_message_hil_state_quaternion(mavlink_message_t *msg);
@@ -120,7 +124,6 @@ private:
 
 	mavlink_status_t status;
 	struct vehicle_local_position_s hil_local_pos;
-	int _manual_sub;
 	orb_advert_t _global_pos_pub;
 	orb_advert_t _local_pos_pub;
 	orb_advert_t _attitude_pub;
@@ -139,8 +142,11 @@ private:
 	orb_advert_t _telemetry_status_pub;
 	orb_advert_t _rc_pub;
 	orb_advert_t _manual_pub;
+	hrt_abstime _telemetry_heartbeat_time;
+	bool _radio_status_available;
 	int _hil_frames;
 	uint64_t _old_timestamp;
 	bool _hil_local_proj_inited;
 	float _hil_local_alt0;
+	struct map_projection_reference_s _hil_local_proj_ref;
 };
diff --git a/src/modules/mavlink/mavlink_stream.cpp b/src/modules/mavlink/mavlink_stream.cpp
index bb19d7e33..7279206db 100644
--- a/src/modules/mavlink/mavlink_stream.cpp
+++ b/src/modules/mavlink/mavlink_stream.cpp
@@ -43,7 +43,11 @@
 #include "mavlink_stream.h"
 #include "mavlink_main.h"
 
-MavlinkStream::MavlinkStream() : _interval(1000000), _last_sent(0), _channel(MAVLINK_COMM_0), next(nullptr)
+MavlinkStream::MavlinkStream() :
+	next(nullptr),
+	_channel(MAVLINK_COMM_0),
+	_interval(1000000),
+	_last_sent(0)
 {
 }
 
@@ -81,5 +85,9 @@ MavlinkStream::update(const hrt_abstime t)
 		/* interval expired, send message */
 		send(t);
 		_last_sent = (t / _interval) * _interval;
+
+		return 0;
 	}
+
+	return -1;
 }
diff --git a/src/modules/mavlink/mavlink_stream.h b/src/modules/mavlink/mavlink_stream.h
index 135e1bce0..69809a386 100644
--- a/src/modules/mavlink/mavlink_stream.h
+++ b/src/modules/mavlink/mavlink_stream.h
@@ -32,7 +32,7 @@
  ****************************************************************************/
 
 /**
- * @file mavlink_stream.cpp
+ * @file mavlink_stream.h
  * Mavlink messages stream definition.
  *
  * @author Anton Babushkin <anton.babushkin@me.com>
@@ -50,26 +50,33 @@ class MavlinkStream;
 
 class MavlinkStream
 {
-private:
-	hrt_abstime _last_sent;
-
-protected:
-	mavlink_channel_t _channel;
-	unsigned int _interval;
-
-	virtual void send(const hrt_abstime t) = 0;
 
 public:
 	MavlinkStream *next;
 
 	MavlinkStream();
-	~MavlinkStream();
+	virtual ~MavlinkStream();
 	void set_interval(const unsigned int interval);
 	void set_channel(mavlink_channel_t channel);
+
+	/**
+	 * @return 0 if updated / sent, -1 if unchanged
+	 */
 	int update(const hrt_abstime t);
-	virtual MavlinkStream *new_instance() = 0;
+	static MavlinkStream *new_instance();
+	static const char *get_name_static();
 	virtual void subscribe(Mavlink *mavlink) = 0;
-	virtual const char *get_name() = 0;
+	virtual const char *get_name() const = 0;
+	virtual uint8_t get_id() = 0;
+
+protected:
+	mavlink_channel_t _channel;
+	unsigned int _interval;
+
+	virtual void send(const hrt_abstime t) = 0;
+
+private:
+	hrt_abstime _last_sent;
 };
 
 
diff --git a/src/modules/mavlink/module.mk b/src/modules/mavlink/module.mk
index f09efa2e6..a4d8bfbfb 100644
--- a/src/modules/mavlink/module.mk
+++ b/src/modules/mavlink/module.mk
@@ -42,6 +42,12 @@ SRCS		 += mavlink_main.cpp \
 			mavlink_orb_subscription.cpp \
 			mavlink_messages.cpp \
 			mavlink_stream.cpp \
-			mavlink_rate_limiter.cpp
+			mavlink_rate_limiter.cpp \
+			mavlink_commands.cpp \
+			mavlink_ftp.cpp
 
 INCLUDE_DIRS	 += $(MAVLINK_SRC)/include/mavlink
+
+MAXOPTIMIZATION	 = -Os
+
+MODULE_STACKSIZE = 1024
diff --git a/src/modules/mc_att_control/mc_att_control_main.cpp b/src/modules/mc_att_control/mc_att_control_main.cpp
index 9cb8e8344..19c10198c 100644
--- a/src/modules/mc_att_control/mc_att_control_main.cpp
+++ b/src/modules/mc_att_control/mc_att_control_main.cpp
@@ -1,9 +1,6 @@
 /****************************************************************************
  *
  *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
- *   Author: @author Tobias Naegeli <naegelit@student.ethz.ch>
- *           @author Lorenz Meier <lm@inf.ethz.ch>
- *           @author Anton Babushkin <anton.babushkin@me.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -35,9 +32,13 @@
  ****************************************************************************/
 
 /**
- * @file mc_att_control_main.c
+ * @file mc_att_control_main.cpp
  * Multicopter attitude controller.
  *
+ * @author Tobias Naegeli <naegelit@student.ethz.ch>
+ * @author Lorenz Meier <lm@inf.ethz.ch>
+ * @author Anton Babushkin <anton.babushkin@me.com>
+ *
  * The controller has two loops: P loop for angular error and PD loop for angular rate error.
  * Desired rotation calculated keeping in mind that yaw response is normally slower than roll/pitch.
  * For small deviations controller rotates copter to have shortest path of thrust vector and independently rotates around yaw,
@@ -71,7 +72,8 @@
 #include <systemlib/err.h>
 #include <systemlib/perf_counter.h>
 #include <systemlib/systemlib.h>
-#include <mathlib/mathlib.h>
+#include <systemlib/circuit_breaker.h>
+#include <lib/mathlib/mathlib.h>
 #include <lib/geo/geo.h>
 
 /**
@@ -122,6 +124,8 @@ private:
 	orb_advert_t	_v_rates_sp_pub;		/**< rate setpoint publication */
 	orb_advert_t	_actuators_0_pub;		/**< attitude actuator controls publication */
 
+	bool		_actuators_0_circuit_breaker_enabled;	/**< circuit breaker to suppress output */
+
 	struct vehicle_attitude_s			_v_att;				/**< vehicle attitude */
 	struct vehicle_attitude_setpoint_s	_v_att_sp;			/**< vehicle attitude setpoint */
 	struct vehicle_rates_setpoint_s		_v_rates_sp;		/**< vehicle rates setpoint */
@@ -156,8 +160,14 @@ private:
 		param_t yaw_rate_i;
 		param_t yaw_rate_d;
 		param_t yaw_ff;
-
-		param_t rc_scale_yaw;
+		param_t yaw_rate_max;
+
+		param_t man_roll_max;
+		param_t man_pitch_max;
+		param_t man_yaw_max;
+		param_t acro_roll_max;
+		param_t acro_pitch_max;
+		param_t acro_yaw_max;
 	}		_params_handles;		/**< handles for interesting parameters */
 
 	struct {
@@ -166,8 +176,12 @@ private:
 		math::Vector<3> rate_i;				/**< I gain for angular rate error */
 		math::Vector<3> rate_d;				/**< D gain for angular rate error */
 		float yaw_ff;						/**< yaw control feed-forward */
+		float yaw_rate_max;					/**< max yaw rate */
 
-		float rc_scale_yaw;
+		float man_roll_max;
+		float man_pitch_max;
+		float man_yaw_max;
+		math::Vector<3> acro_rate_max;		/**< max attitude rates in acro mode */
 	}		_params;
 
 	/**
@@ -221,9 +235,9 @@ private:
 	static void	task_main_trampoline(int argc, char *argv[]);
 
 	/**
-	 * Main sensor collection task.
+	 * Main attitude control task.
 	 */
-	void		task_main() __attribute__((noreturn));
+	void		task_main();
 };
 
 namespace mc_att_control
@@ -256,6 +270,8 @@ MulticopterAttitudeControl::MulticopterAttitudeControl() :
 	_v_rates_sp_pub(-1),
 	_actuators_0_pub(-1),
 
+	_actuators_0_circuit_breaker_enabled(false),
+
 /* performance counters */
 	_loop_perf(perf_alloc(PC_ELAPSED, "mc_att_control"))
 
@@ -272,6 +288,12 @@ MulticopterAttitudeControl::MulticopterAttitudeControl() :
 	_params.rate_p.zero();
 	_params.rate_i.zero();
 	_params.rate_d.zero();
+	_params.yaw_ff = 0.0f;
+	_params.yaw_rate_max = 0.0f;
+	_params.man_roll_max = 0.0f;
+	_params.man_pitch_max = 0.0f;
+	_params.man_yaw_max = 0.0f;
+	_params.acro_rate_max.zero();
 
 	_rates_prev.zero();
 	_rates_sp.zero();
@@ -294,8 +316,13 @@ MulticopterAttitudeControl::MulticopterAttitudeControl() :
 	_params_handles.yaw_rate_i		= 	param_find("MC_YAWRATE_I");
 	_params_handles.yaw_rate_d		= 	param_find("MC_YAWRATE_D");
 	_params_handles.yaw_ff			= 	param_find("MC_YAW_FF");
-
-	_params_handles.rc_scale_yaw	= 	param_find("RC_SCALE_YAW");
+	_params_handles.yaw_rate_max	= 	param_find("MC_YAWRATE_MAX");
+	_params_handles.man_roll_max	= 	param_find("MC_MAN_R_MAX");
+	_params_handles.man_pitch_max	= 	param_find("MC_MAN_P_MAX");
+	_params_handles.man_yaw_max		= 	param_find("MC_MAN_Y_MAX");
+	_params_handles.acro_roll_max	= 	param_find("MC_ACRO_R_MAX");
+	_params_handles.acro_pitch_max	= 	param_find("MC_ACRO_P_MAX");
+	_params_handles.acro_yaw_max		= 	param_find("MC_ACRO_Y_MAX");
 
 	/* fetch initial parameter values */
 	parameters_update();
@@ -330,7 +357,7 @@ MulticopterAttitudeControl::parameters_update()
 {
 	float v;
 
-	/* roll */
+	/* roll gains */
 	param_get(_params_handles.roll_p, &v);
 	_params.att_p(0) = v;
 	param_get(_params_handles.roll_rate_p, &v);
@@ -340,7 +367,7 @@ MulticopterAttitudeControl::parameters_update()
 	param_get(_params_handles.roll_rate_d, &v);
 	_params.rate_d(0) = v;
 
-	/* pitch */
+	/* pitch gains */
 	param_get(_params_handles.pitch_p, &v);
 	_params.att_p(1) = v;
 	param_get(_params_handles.pitch_rate_p, &v);
@@ -350,7 +377,7 @@ MulticopterAttitudeControl::parameters_update()
 	param_get(_params_handles.pitch_rate_d, &v);
 	_params.rate_d(1) = v;
 
-	/* yaw */
+	/* yaw gains */
 	param_get(_params_handles.yaw_p, &v);
 	_params.att_p(2) = v;
 	param_get(_params_handles.yaw_rate_p, &v);
@@ -361,8 +388,26 @@ MulticopterAttitudeControl::parameters_update()
 	_params.rate_d(2) = v;
 
 	param_get(_params_handles.yaw_ff, &_params.yaw_ff);
-
-	param_get(_params_handles.rc_scale_yaw, &_params.rc_scale_yaw);
+	param_get(_params_handles.yaw_rate_max, &_params.yaw_rate_max);
+	_params.yaw_rate_max = math::radians(_params.yaw_rate_max);
+
+	/* manual control scale */
+	param_get(_params_handles.man_roll_max, &_params.man_roll_max);
+	param_get(_params_handles.man_pitch_max, &_params.man_pitch_max);
+	param_get(_params_handles.man_yaw_max, &_params.man_yaw_max);
+	_params.man_roll_max = math::radians(_params.man_roll_max);
+	_params.man_pitch_max = math::radians(_params.man_pitch_max);
+	_params.man_yaw_max = math::radians(_params.man_yaw_max);
+
+	/* acro control scale */
+	param_get(_params_handles.acro_roll_max, &v);
+	_params.acro_rate_max(0) = math::radians(v);
+	param_get(_params_handles.acro_pitch_max, &v);
+	_params.acro_rate_max(1) = math::radians(v);
+	param_get(_params_handles.acro_yaw_max, &v);
+	_params.acro_rate_max(2) = math::radians(v);
+
+	_actuators_0_circuit_breaker_enabled = circuit_breaker_enabled("CBRK_RATE_CTRL", CBRK_RATE_CTRL_KEY);
 
 	return OK;
 }
@@ -404,7 +449,6 @@ MulticopterAttitudeControl::vehicle_manual_poll()
 	orb_check(_manual_control_sp_sub, &updated);
 
 	if (updated) {
-
 		orb_copy(ORB_ID(manual_control_setpoint), _manual_control_sp_sub, &_manual_control_sp);
 	}
 }
@@ -466,7 +510,7 @@ MulticopterAttitudeControl::control_attitude(float dt)
 
 		if (!_v_control_mode.flag_control_climb_rate_enabled) {
 			/* pass throttle directly if not in altitude stabilized mode */
-			_v_att_sp.thrust = _manual_control_sp.throttle;
+			_v_att_sp.thrust = _manual_control_sp.z;
 			publish_att_sp = true;
 		}
 
@@ -483,24 +527,19 @@ MulticopterAttitudeControl::control_attitude(float dt)
 			//	reset_yaw_sp = true;
 			//}
 		} else {
-			float yaw_dz_scaled = YAW_DEADZONE * _params.rc_scale_yaw;
-
-			if (_params.rc_scale_yaw > 0.001f && fabs(_manual_control_sp.yaw) > yaw_dz_scaled) {
-				/* move yaw setpoint */
-				yaw_sp_move_rate = _manual_control_sp.yaw / _params.rc_scale_yaw;
-
-				if (_manual_control_sp.yaw > 0.0f) {
-					yaw_sp_move_rate -= YAW_DEADZONE;
-
-				} else {
-					yaw_sp_move_rate += YAW_DEADZONE;
-				}
-
-				yaw_sp_move_rate *= _params.rc_scale_yaw;
-				_v_att_sp.yaw_body = _wrap_pi(_v_att_sp.yaw_body + yaw_sp_move_rate * dt);
-				_v_att_sp.R_valid = false;
-				publish_att_sp = true;
+			/* move yaw setpoint */
+			yaw_sp_move_rate = _manual_control_sp.r * _params.man_yaw_max;
+			_v_att_sp.yaw_body = _wrap_pi(_v_att_sp.yaw_body + yaw_sp_move_rate * dt);
+			float yaw_offs_max = _params.man_yaw_max / _params.att_p(2);
+			float yaw_offs = _wrap_pi(_v_att_sp.yaw_body - _v_att.yaw);
+			if (yaw_offs < - yaw_offs_max) {
+				_v_att_sp.yaw_body = _wrap_pi(_v_att.yaw - yaw_offs_max);
+
+			} else if (yaw_offs > yaw_offs_max) {
+				_v_att_sp.yaw_body = _wrap_pi(_v_att.yaw + yaw_offs_max);
 			}
+			_v_att_sp.R_valid = false;
+			publish_att_sp = true;
 		}
 
 		/* reset yaw setpint to current position if needed */
@@ -513,8 +552,8 @@ MulticopterAttitudeControl::control_attitude(float dt)
 
 		if (!_v_control_mode.flag_control_velocity_enabled) {
 			/* update attitude setpoint if not in position control mode */
-			_v_att_sp.roll_body = _manual_control_sp.roll;
-			_v_att_sp.pitch_body = _manual_control_sp.pitch;
+			_v_att_sp.roll_body = _manual_control_sp.y * _params.man_roll_max;
+			_v_att_sp.pitch_body = -_manual_control_sp.x * _params.man_pitch_max;
 			_v_att_sp.R_valid = false;
 			publish_att_sp = true;
 		}
@@ -627,6 +666,9 @@ MulticopterAttitudeControl::control_attitude(float dt)
 	/* calculate angular rates setpoint */
 	_rates_sp = _params.att_p.emult(e_R);
 
+	/* limit yaw rate */
+	_rates_sp(2) = math::constrain(_rates_sp(2), -_params.yaw_rate_max, _params.yaw_rate_max);
+
 	/* feed forward yaw setpoint rate */
 	_rates_sp(2) += yaw_sp_move_rate * yaw_w * _params.yaw_ff;
 }
@@ -763,11 +805,36 @@ MulticopterAttitudeControl::task_main()
 
 			} else {
 				/* attitude controller disabled, poll rates setpoint topic */
-				vehicle_rates_setpoint_poll();
-				_rates_sp(0) = _v_rates_sp.roll;
-				_rates_sp(1) = _v_rates_sp.pitch;
-				_rates_sp(2) = _v_rates_sp.yaw;
-				_thrust_sp = _v_rates_sp.thrust;
+				if (_v_control_mode.flag_control_manual_enabled) {
+					/* manual rates control - ACRO mode */
+					_rates_sp = math::Vector<3>(_manual_control_sp.y, -_manual_control_sp.x, _manual_control_sp.r).emult(_params.acro_rate_max);
+					_thrust_sp = _manual_control_sp.z;
+
+					/* reset yaw setpoint after ACRO */
+					_reset_yaw_sp = true;
+
+					/* publish attitude rates setpoint */
+					_v_rates_sp.roll = _rates_sp(0);
+					_v_rates_sp.pitch = _rates_sp(1);
+					_v_rates_sp.yaw = _rates_sp(2);
+					_v_rates_sp.thrust = _thrust_sp;
+					_v_rates_sp.timestamp = hrt_absolute_time();
+
+					if (_v_rates_sp_pub > 0) {
+						orb_publish(ORB_ID(vehicle_rates_setpoint), _v_rates_sp_pub, &_v_rates_sp);
+
+					} else {
+						_v_rates_sp_pub = orb_advertise(ORB_ID(vehicle_rates_setpoint), &_v_rates_sp);
+					}
+
+				} else {
+					/* attitude controller disabled, poll rates setpoint topic */
+					vehicle_rates_setpoint_poll();
+					_rates_sp(0) = _v_rates_sp.roll;
+					_rates_sp(1) = _v_rates_sp.pitch;
+					_rates_sp(2) = _v_rates_sp.yaw;
+					_thrust_sp = _v_rates_sp.thrust;
+				}
 			}
 
 			if (_v_control_mode.flag_control_rates_enabled) {
@@ -780,11 +847,13 @@ MulticopterAttitudeControl::task_main()
 				_actuators.control[3] = (isfinite(_thrust_sp)) ? _thrust_sp : 0.0f;
 				_actuators.timestamp = hrt_absolute_time();
 
-				if (_actuators_0_pub > 0) {
-					orb_publish(ORB_ID(actuator_controls_0), _actuators_0_pub, &_actuators);
+				if (!_actuators_0_circuit_breaker_enabled) {
+					if (_actuators_0_pub > 0) {
+						orb_publish(ORB_ID(actuator_controls_0), _actuators_0_pub, &_actuators);
 
-				} else {
-					_actuators_0_pub = orb_advertise(ORB_ID(actuator_controls_0), &_actuators);
+					} else {
+						_actuators_0_pub = orb_advertise(ORB_ID(actuator_controls_0), &_actuators);
+					}
 				}
 			}
 		}
@@ -807,7 +876,7 @@ MulticopterAttitudeControl::start()
 	_control_task = task_spawn_cmd("mc_att_control",
 				       SCHED_DEFAULT,
 				       SCHED_PRIORITY_MAX - 5,
-				       2048,
+				       2000,
 				       (main_t)&MulticopterAttitudeControl::task_main_trampoline,
 				       nullptr);
 
diff --git a/src/modules/mc_att_control/mc_att_control_params.c b/src/modules/mc_att_control/mc_att_control_params.c
index 488107d58..819847b40 100644
--- a/src/modules/mc_att_control/mc_att_control_params.c
+++ b/src/modules/mc_att_control/mc_att_control_params.c
@@ -1,9 +1,6 @@
 /****************************************************************************
  *
  *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
- *   Author: @author Tobias Naegeli <naegelit@student.ethz.ch>
- *   	     @author Lorenz Meier <lm@inf.ethz.ch>
- *           @author Anton Babushkin <anton.babushkin@me.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -37,6 +34,10 @@
 /**
  * @file mc_att_control_params.c
  * Parameters for multicopter attitude controller.
+ *
+ * @author Tobias Naegeli <naegelit@student.ethz.ch>
+ * @author Lorenz Meier <lm@inf.ethz.ch>
+ * @author Anton Babushkin <anton.babushkin@me.com>
  */
 
 #include <systemlib/param/param.h>
@@ -173,3 +174,73 @@ PARAM_DEFINE_FLOAT(MC_YAWRATE_D, 0.0f);
  * @group Multicopter Attitude Control
  */
 PARAM_DEFINE_FLOAT(MC_YAW_FF, 0.5f);
+
+/**
+ * Max yaw rate
+ *
+ * Limit for yaw rate, has effect for large rotations in autonomous mode, to avoid large control output and mixer saturation.
+ *
+ * @unit deg/s
+ * @min 0.0
+ * @max 360.0
+ * @group Multicopter Attitude Control
+ */
+PARAM_DEFINE_FLOAT(MC_YAWRATE_MAX, 120.0f);
+
+/**
+ * Max manual roll
+ *
+ * @unit deg
+ * @min 0.0
+ * @max 90.0
+ * @group Multicopter Attitude Control
+ */
+PARAM_DEFINE_FLOAT(MC_MAN_R_MAX, 35.0f);
+
+/**
+ * Max manual pitch
+ *
+ * @unit deg
+ * @min 0.0
+ * @max 90.0
+ * @group Multicopter Attitude Control
+ */
+PARAM_DEFINE_FLOAT(MC_MAN_P_MAX, 35.0f);
+
+/**
+ * Max manual yaw rate
+ *
+ * @unit deg/s
+ * @min 0.0
+ * @group Multicopter Attitude Control
+ */
+PARAM_DEFINE_FLOAT(MC_MAN_Y_MAX, 120.0f);
+
+/**
+ * Max acro roll rate
+ *
+ * @unit deg/s
+ * @min 0.0
+ * @max 360.0
+ * @group Multicopter Attitude Control
+ */
+PARAM_DEFINE_FLOAT(MC_ACRO_R_MAX, 90.0f);
+
+/**
+ * Max acro pitch rate
+ *
+ * @unit deg/s
+ * @min 0.0
+ * @max 360.0
+ * @group Multicopter Attitude Control
+ */
+PARAM_DEFINE_FLOAT(MC_ACRO_P_MAX, 90.0f);
+
+/**
+ * Max acro yaw rate
+ *
+ * @unit deg/s
+ * @min 0.0
+ * @group Multicopter Attitude Control
+ */
+PARAM_DEFINE_FLOAT(MC_ACRO_Y_MAX, 120.0f);
diff --git a/src/modules/mc_pos_control/mc_pos_control_main.cpp b/src/modules/mc_pos_control/mc_pos_control_main.cpp
index 78d06ba5b..bcc3e2ae7 100644
--- a/src/modules/mc_pos_control/mc_pos_control_main.cpp
+++ b/src/modules/mc_pos_control/mc_pos_control_main.cpp
@@ -1,7 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
- *   Author: @author Anton Babushkin <anton.babushkin@me.com>
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -40,6 +39,8 @@
  * Output of velocity controller is thrust vector that splitted to thrust direction
  * (i.e. rotation matrix for multicopter orientation) and thrust module (i.e. multicopter thrust itself).
  * Controller doesn't use Euler angles for work, they generated only for more human-friendly control and logging.
+ *
+ * @author Anton Babushkin <anton.babushkin@me.com>
  */
 
 #include <nuttx/config.h>
@@ -62,9 +63,10 @@
 #include <uORB/topics/vehicle_control_mode.h>
 #include <uORB/topics/actuator_armed.h>
 #include <uORB/topics/parameter_update.h>
-#include <uORB/topics/vehicle_global_position.h>
+#include <uORB/topics/vehicle_local_position.h>
 #include <uORB/topics/position_setpoint_triplet.h>
 #include <uORB/topics/vehicle_global_velocity_setpoint.h>
+#include <uORB/topics/vehicle_local_position_setpoint.h>
 #include <systemlib/param/param.h>
 #include <systemlib/err.h>
 #include <systemlib/systemlib.h>
@@ -114,20 +116,21 @@ private:
 	int 	_params_sub;			/**< notification of parameter updates */
 	int 	_manual_sub;			/**< notification of manual control updates */
 	int		_arming_sub;			/**< arming status of outputs */
-	int		_global_pos_sub;			/**< vehicle local position */
+	int		_local_pos_sub;			/**< vehicle local position */
 	int		_pos_sp_triplet_sub;		/**< position setpoint triplet */
 
 	orb_advert_t	_att_sp_pub;			/**< attitude setpoint publication */
-	orb_advert_t	_pos_sp_triplet_pub;	/**< position setpoint triplet publication */
-	orb_advert_t	_global_vel_sp_pub;		/**< vehicle global velocity setpoint */
+	orb_advert_t	_local_pos_sp_pub;		/**< vehicle local position setpoint publication */
+	orb_advert_t	_global_vel_sp_pub;		/**< vehicle global velocity setpoint publication */
 
 	struct vehicle_attitude_s			_att;			/**< vehicle attitude */
 	struct vehicle_attitude_setpoint_s	_att_sp;		/**< vehicle attitude setpoint */
 	struct manual_control_setpoint_s	_manual;		/**< r/c channel data */
 	struct vehicle_control_mode_s		_control_mode;	/**< vehicle control mode */
 	struct actuator_armed_s				_arming;		/**< actuator arming status */
-	struct vehicle_global_position_s		_global_pos;	/**< vehicle global position */
+	struct vehicle_local_position_s		_local_pos;		/**< vehicle local position */
 	struct position_setpoint_triplet_s		_pos_sp_triplet;	/**< vehicle global position setpoint triplet */
+	struct vehicle_local_position_setpoint_s	_local_pos_sp;		/**< vehicle local position setpoint */
 	struct vehicle_global_velocity_setpoint_s	_global_vel_sp;	/**< vehicle global velocity setpoint */
 
 	struct {
@@ -145,23 +148,17 @@ private:
 		param_t xy_vel_d;
 		param_t xy_vel_max;
 		param_t xy_ff;
-		param_t tilt_max;
+		param_t tilt_max_air;
 		param_t land_speed;
-		param_t land_tilt_max;
-
-		param_t rc_scale_pitch;
-		param_t rc_scale_roll;
+		param_t tilt_max_land;
 	}		_params_handles;		/**< handles for interesting parameters */
 
 	struct {
 		float thr_min;
 		float thr_max;
-		float tilt_max;
+		float tilt_max_air;
 		float land_speed;
-		float land_tilt_max;
-
-		float rc_scale_pitch;
-		float rc_scale_roll;
+		float tilt_max_land;
 
 		math::Vector<3> pos_p;
 		math::Vector<3> vel_p;
@@ -172,14 +169,15 @@ private:
 		math::Vector<3> sp_offs_max;
 	}		_params;
 
-	double _lat_sp;
-	double _lon_sp;
-	float _alt_sp;
+	struct map_projection_reference_s _ref_pos;
+	float _ref_alt;
+	hrt_abstime _ref_timestamp;
 
-	bool _reset_lat_lon_sp;
+	bool _reset_pos_sp;
 	bool _reset_alt_sp;
-	bool _use_global_alt;			/**< switch between global (AMSL) and barometric altitudes */
 
+	math::Vector<3> _pos;
+	math::Vector<3> _pos_sp;
 	math::Vector<3> _vel;
 	math::Vector<3> _vel_sp;
 	math::Vector<3> _vel_prev;			/**< velocity on previous step */
@@ -202,9 +200,13 @@ private:
 	static float	scale_control(float ctl, float end, float dz);
 
 	/**
-	 * Reset lat/lon to current position
+	 * Update reference for local position projection
+	 */
+	void		update_ref();
+	/**
+	 * Reset position setpoint to current position
 	 */
-	void		reset_lat_lon_sp();
+	void		reset_pos_sp();
 
 	/**
 	 * Reset altitude setpoint to current altitude
@@ -224,7 +226,7 @@ private:
 	/**
 	 * Main sensor collection task.
 	 */
-	void		task_main() __attribute__((noreturn));
+	void		task_main();
 };
 
 namespace pos_control
@@ -252,31 +254,32 @@ MulticopterPositionControl::MulticopterPositionControl() :
 	_params_sub(-1),
 	_manual_sub(-1),
 	_arming_sub(-1),
-	_global_pos_sub(-1),
+	_local_pos_sub(-1),
 	_pos_sp_triplet_sub(-1),
 
 /* publications */
 	_att_sp_pub(-1),
-	_pos_sp_triplet_pub(-1),
+	_local_pos_sp_pub(-1),
 	_global_vel_sp_pub(-1),
 
-	_lat_sp(0.0),
-	_lon_sp(0.0),
-	_alt_sp(0.0f),
+	_ref_alt(0.0f),
+	_ref_timestamp(0),
 
-	_reset_lat_lon_sp(true),
-	_reset_alt_sp(true),
-	_use_global_alt(false)
+	_reset_pos_sp(true),
+	_reset_alt_sp(true)
 {
 	memset(&_att, 0, sizeof(_att));
 	memset(&_att_sp, 0, sizeof(_att_sp));
 	memset(&_manual, 0, sizeof(_manual));
 	memset(&_control_mode, 0, sizeof(_control_mode));
 	memset(&_arming, 0, sizeof(_arming));
-	memset(&_global_pos, 0, sizeof(_global_pos));
+	memset(&_local_pos, 0, sizeof(_local_pos));
 	memset(&_pos_sp_triplet, 0, sizeof(_pos_sp_triplet));
+	memset(&_local_pos_sp, 0, sizeof(_local_pos_sp));
 	memset(&_global_vel_sp, 0, sizeof(_global_vel_sp));
 
+	memset(&_ref_pos, 0, sizeof(_ref_pos));
+
 	_params.pos_p.zero();
 	_params.vel_p.zero();
 	_params.vel_i.zero();
@@ -285,6 +288,8 @@ MulticopterPositionControl::MulticopterPositionControl() :
 	_params.vel_ff.zero();
 	_params.sp_offs_max.zero();
 
+	_pos.zero();
+	_pos_sp.zero();
 	_vel.zero();
 	_vel_sp.zero();
 	_vel_prev.zero();
@@ -303,11 +308,9 @@ MulticopterPositionControl::MulticopterPositionControl() :
 	_params_handles.xy_vel_d	= param_find("MPC_XY_VEL_D");
 	_params_handles.xy_vel_max	= param_find("MPC_XY_VEL_MAX");
 	_params_handles.xy_ff		= param_find("MPC_XY_FF");
-	_params_handles.tilt_max	= param_find("MPC_TILT_MAX");
+	_params_handles.tilt_max_air	= param_find("MPC_TILTMAX_AIR");
 	_params_handles.land_speed	= param_find("MPC_LAND_SPEED");
-	_params_handles.land_tilt_max	= param_find("MPC_LAND_TILT");
-	_params_handles.rc_scale_pitch	= param_find("RC_SCALE_PITCH");
-	_params_handles.rc_scale_roll	= param_find("RC_SCALE_ROLL");
+	_params_handles.tilt_max_land	= param_find("MPC_TILTMAX_LND");
 
 	/* fetch initial parameter values */
 	parameters_update(true);
@@ -345,17 +348,18 @@ MulticopterPositionControl::parameters_update(bool force)
 
 	orb_check(_params_sub, &updated);
 
-	if (updated)
+	if (updated) {
 		orb_copy(ORB_ID(parameter_update), _params_sub, &param_upd);
+	}
 
 	if (updated || force) {
 		param_get(_params_handles.thr_min, &_params.thr_min);
 		param_get(_params_handles.thr_max, &_params.thr_max);
-		param_get(_params_handles.tilt_max, &_params.tilt_max);
+		param_get(_params_handles.tilt_max_air, &_params.tilt_max_air);
+		_params.tilt_max_air = math::radians(_params.tilt_max_air);
 		param_get(_params_handles.land_speed, &_params.land_speed);
-		param_get(_params_handles.land_tilt_max, &_params.land_tilt_max);
-		param_get(_params_handles.rc_scale_pitch, &_params.rc_scale_pitch);
-		param_get(_params_handles.rc_scale_roll, &_params.rc_scale_roll);
+		param_get(_params_handles.tilt_max_land, &_params.tilt_max_land);
+		_params.tilt_max_land = math::radians(_params.tilt_max_land);
 
 		float v;
 		param_get(_params_handles.xy_p, &v);
@@ -402,33 +406,39 @@ MulticopterPositionControl::poll_subscriptions()
 
 	orb_check(_att_sub, &updated);
 
-	if (updated)
+	if (updated) {
 		orb_copy(ORB_ID(vehicle_attitude), _att_sub, &_att);
+	}
 
 	orb_check(_att_sp_sub, &updated);
 
-	if (updated)
+	if (updated) {
 		orb_copy(ORB_ID(vehicle_attitude_setpoint), _att_sp_sub, &_att_sp);
+	}
 
 	orb_check(_control_mode_sub, &updated);
 
-	if (updated)
+	if (updated) {
 		orb_copy(ORB_ID(vehicle_control_mode), _control_mode_sub, &_control_mode);
+	}
 
 	orb_check(_manual_sub, &updated);
 
-	if (updated)
+	if (updated) {
 		orb_copy(ORB_ID(manual_control_setpoint), _manual_sub, &_manual);
+	}
 
 	orb_check(_arming_sub, &updated);
 
-	if (updated)
+	if (updated) {
 		orb_copy(ORB_ID(actuator_armed), _arming_sub, &_arming);
+	}
 
-	orb_check(_global_pos_sub, &updated);
+	orb_check(_local_pos_sub, &updated);
 
-	if (updated)
-		orb_copy(ORB_ID(vehicle_global_position), _global_pos_sub, &_global_pos);
+	if (updated) {
+		orb_copy(ORB_ID(vehicle_local_position), _local_pos_sub, &_local_pos);
+	}
 }
 
 float
@@ -452,40 +462,50 @@ MulticopterPositionControl::task_main_trampoline(int argc, char *argv[])
 }
 
 void
-MulticopterPositionControl::reset_lat_lon_sp()
+MulticopterPositionControl::update_ref()
 {
-	if (_reset_lat_lon_sp) {
-		_reset_lat_lon_sp = false;
-		_lat_sp = _global_pos.lat;
-		_lon_sp = _global_pos.lon;
-		mavlink_log_info(_mavlink_fd, "[mpc] reset lat/lon sp: %.7f, %.7f", _lat_sp, _lon_sp);
+	if (_local_pos.ref_timestamp != _ref_timestamp) {
+		double lat_sp, lon_sp;
+		float alt_sp = 0.0f;
+
+		if (_ref_timestamp != 0) {
+			/* calculate current position setpoint in global frame */
+			map_projection_reproject(&_ref_pos, _pos_sp(0), _pos_sp(1), &lat_sp, &lon_sp);
+			alt_sp = _ref_alt - _pos_sp(2);
+		}
+
+		/* update local projection reference */
+		map_projection_init(&_ref_pos, _local_pos.ref_lat, _local_pos.ref_lon);
+		_ref_alt = _local_pos.ref_alt;
+
+		if (_ref_timestamp != 0) {
+			/* reproject position setpoint to new reference */
+			map_projection_project(&_ref_pos, lat_sp, lon_sp, &_pos_sp.data[0], &_pos_sp.data[1]);
+			_pos_sp(2) = -(alt_sp - _ref_alt);
+		}
+
+		_ref_timestamp = _local_pos.ref_timestamp;
 	}
 }
 
 void
-MulticopterPositionControl::reset_alt_sp()
+MulticopterPositionControl::reset_pos_sp()
 {
-	if (_reset_alt_sp) {
-		_reset_alt_sp = false;
-		_alt_sp = _use_global_alt ? _global_pos.alt : _global_pos.baro_alt;
-		mavlink_log_info(_mavlink_fd, "[mpc] reset alt (%s) sp: %.2f", _use_global_alt ? "AMSL" : "baro", (double)_alt_sp);
+	if (_reset_pos_sp) {
+		_reset_pos_sp = false;
+		_pos_sp(0) = _pos(0);
+		_pos_sp(1) = _pos(1);
+		mavlink_log_info(_mavlink_fd, "[mpc] reset pos sp: %.2f, %.2f", (double)_pos_sp(0), (double)_pos_sp(1));
 	}
 }
 
 void
-MulticopterPositionControl::select_alt(bool global)
+MulticopterPositionControl::reset_alt_sp()
 {
-	if (global != _use_global_alt) {
-		_use_global_alt = global;
-
-		if (global) {
-			/* switch from barometric to global altitude */
-			_alt_sp += _global_pos.alt - _global_pos.baro_alt;
-
-		} else {
-			/* switch from global to barometric altitude */
-			_alt_sp += _global_pos.baro_alt - _global_pos.alt;
-		}
+	if (_reset_alt_sp) {
+		_reset_alt_sp = false;
+		_pos_sp(2) = _pos(2);
+		mavlink_log_info(_mavlink_fd, "[mpc] reset alt sp: %.2f", -(double)_pos_sp(2));
 	}
 }
 
@@ -506,7 +526,7 @@ MulticopterPositionControl::task_main()
 	_params_sub = orb_subscribe(ORB_ID(parameter_update));
 	_manual_sub = orb_subscribe(ORB_ID(manual_control_setpoint));
 	_arming_sub = orb_subscribe(ORB_ID(actuator_armed));
-	_global_pos_sub = orb_subscribe(ORB_ID(vehicle_global_position));
+	_local_pos_sub = orb_subscribe(ORB_ID(vehicle_local_position));
 	_pos_sp_triplet_sub = orb_subscribe(ORB_ID(position_setpoint_triplet));
 
 	parameters_update(true);
@@ -525,7 +545,6 @@ MulticopterPositionControl::task_main()
 	hrt_abstime t_prev = 0;
 
 	const float alt_ctl_dz = 0.2f;
-	const float pos_ctl_dz = 0.05f;
 
 	math::Vector<3> sp_move_rate;
 	sp_move_rate.zero();
@@ -537,8 +556,7 @@ MulticopterPositionControl::task_main()
 	/* wakeup source */
 	struct pollfd fds[1];
 
-	/* Setup of loop */
-	fds[0].fd = _global_pos_sub;
+	fds[0].fd = _local_pos_sub;
 	fds[0].events = POLLIN;
 
 	while (!_task_should_exit) {
@@ -546,8 +564,9 @@ MulticopterPositionControl::task_main()
 		int pret = poll(&fds[0], (sizeof(fds) / sizeof(fds[0])), 500);
 
 		/* timed out - periodic check for _task_should_exit */
-		if (pret == 0)
+		if (pret == 0) {
 			continue;
+		}
 
 		/* this is undesirable but not much we can do */
 		if (pret < 0) {
@@ -564,7 +583,7 @@ MulticopterPositionControl::task_main()
 
 		if (_control_mode.flag_armed && !was_armed) {
 			/* reset setpoints and integrals on arming */
-			_reset_lat_lon_sp = true;
+			_reset_pos_sp = true;
 			_reset_alt_sp = true;
 			reset_int_z = true;
 			reset_int_xy = true;
@@ -572,44 +591,41 @@ MulticopterPositionControl::task_main()
 
 		was_armed = _control_mode.flag_armed;
 
+		update_ref();
+
 		if (_control_mode.flag_control_altitude_enabled ||
 		    _control_mode.flag_control_position_enabled ||
 		    _control_mode.flag_control_climb_rate_enabled ||
 		    _control_mode.flag_control_velocity_enabled) {
 
-			_vel(0) = _global_pos.vel_n;
-			_vel(1) = _global_pos.vel_e;
-			_vel(2) = _global_pos.vel_d;
+			_pos(0) = _local_pos.x;
+			_pos(1) = _local_pos.y;
+			_pos(2) = _local_pos.z;
 
-			sp_move_rate.zero();
+			_vel(0) = _local_pos.vx;
+			_vel(1) = _local_pos.vy;
+			_vel(2) = _local_pos.vz;
 
-			float alt = _global_pos.alt;
+			sp_move_rate.zero();
 
 			/* select control source */
 			if (_control_mode.flag_control_manual_enabled) {
-				/* select altitude source and update setpoint */
-				select_alt(_global_pos.global_valid);
-
-				if (!_use_global_alt) {
-					alt = _global_pos.baro_alt;
-				}
-
 				/* manual control */
 				if (_control_mode.flag_control_altitude_enabled) {
 					/* reset alt setpoint to current altitude if needed */
 					reset_alt_sp();
 
 					/* move altitude setpoint with throttle stick */
-					sp_move_rate(2) = -scale_control(_manual.throttle - 0.5f, 0.5f, alt_ctl_dz);
+					sp_move_rate(2) = -scale_control(_manual.z - 0.5f, 0.5f, alt_ctl_dz);
 				}
 
 				if (_control_mode.flag_control_position_enabled) {
-					/* reset lat/lon setpoint to current position if needed */
-					reset_lat_lon_sp();
+					/* reset position setpoint to current position if needed */
+					reset_pos_sp();
 
 					/* move position setpoint with roll/pitch stick */
-					sp_move_rate(0) = scale_control(-_manual.pitch / _params.rc_scale_pitch, 1.0f, pos_ctl_dz);
-					sp_move_rate(1) = scale_control(_manual.roll / _params.rc_scale_roll, 1.0f, pos_ctl_dz);
+					sp_move_rate(0) = _manual.x;
+					sp_move_rate(1) = _manual.y;
 				}
 
 				/* limit setpoint move rate */
@@ -625,74 +641,47 @@ MulticopterPositionControl::task_main()
 				sp_move_rate = R_yaw_sp * sp_move_rate.emult(_params.vel_max);
 
 				/* move position setpoint */
-				add_vector_to_global_position(_lat_sp, _lon_sp, sp_move_rate(0) * dt, sp_move_rate(1) * dt, &_lat_sp, &_lon_sp);
-				_alt_sp -= sp_move_rate(2) * dt;
+				_pos_sp += sp_move_rate * dt;
 
 				/* check if position setpoint is too far from actual position */
 				math::Vector<3> pos_sp_offs;
 				pos_sp_offs.zero();
 
 				if (_control_mode.flag_control_position_enabled) {
-					get_vector_to_next_waypoint_fast(_global_pos.lat, _global_pos.lon, _lat_sp, _lon_sp, &pos_sp_offs.data[0], &pos_sp_offs.data[1]);
-					pos_sp_offs(0) /= _params.sp_offs_max(0);
-					pos_sp_offs(1) /= _params.sp_offs_max(1);
+					pos_sp_offs(0) = (_pos_sp(0) - _pos(0)) / _params.sp_offs_max(0);
+					pos_sp_offs(1) = (_pos_sp(1) - _pos(1)) / _params.sp_offs_max(1);
 				}
 
 				if (_control_mode.flag_control_altitude_enabled) {
-					pos_sp_offs(2) = -(_alt_sp - alt) / _params.sp_offs_max(2);
+					pos_sp_offs(2) = (_pos_sp(2) - _pos(2)) / _params.sp_offs_max(2);
 				}
 
 				float pos_sp_offs_norm = pos_sp_offs.length();
 
 				if (pos_sp_offs_norm > 1.0f) {
 					pos_sp_offs /= pos_sp_offs_norm;
-					add_vector_to_global_position(_global_pos.lat, _global_pos.lon, pos_sp_offs(0) * _params.sp_offs_max(0), pos_sp_offs(1) * _params.sp_offs_max(1), &_lat_sp, &_lon_sp);
-					_alt_sp = alt - pos_sp_offs(2) * _params.sp_offs_max(2);
-				}
-
-				/* fill position setpoint triplet */
-				_pos_sp_triplet.previous.valid = true;
-				_pos_sp_triplet.current.valid = true;
-				_pos_sp_triplet.next.valid = true;
-
-				_pos_sp_triplet.nav_state = NAV_STATE_NONE;
-				_pos_sp_triplet.current.type = SETPOINT_TYPE_NORMAL;
-				_pos_sp_triplet.current.lat = _lat_sp;
-				_pos_sp_triplet.current.lon = _lon_sp;
-				_pos_sp_triplet.current.alt = _alt_sp;
-				_pos_sp_triplet.current.yaw = _att_sp.yaw_body;
-				_pos_sp_triplet.current.loiter_radius = 0.0f;
-				_pos_sp_triplet.current.loiter_direction = 1.0f;
-				_pos_sp_triplet.current.pitch_min = 0.0f;
-
-				/* publish position setpoint triplet */
-				if (_pos_sp_triplet_pub > 0) {
-					orb_publish(ORB_ID(position_setpoint_triplet), _pos_sp_triplet_pub, &_pos_sp_triplet);
-
-				} else {
-					_pos_sp_triplet_pub = orb_advertise(ORB_ID(position_setpoint_triplet), &_pos_sp_triplet);
+					_pos_sp = _pos + pos_sp_offs.emult(_params.sp_offs_max);
 				}
 
 			} else {
-				/* always use AMSL altitude for AUTO */
-				select_alt(true);
-
 				/* AUTO */
 				bool updated;
 				orb_check(_pos_sp_triplet_sub, &updated);
 
-				if (updated)
+				if (updated) {
 					orb_copy(ORB_ID(position_setpoint_triplet), _pos_sp_triplet_sub, &_pos_sp_triplet);
+				}
 
 				if (_pos_sp_triplet.current.valid) {
 					/* in case of interrupted mission don't go to waypoint but stay at current position */
-					_reset_lat_lon_sp = true;
+					_reset_pos_sp = true;
 					_reset_alt_sp = true;
 
-					/* update position setpoint */
-					_lat_sp = _pos_sp_triplet.current.lat;
-					_lon_sp = _pos_sp_triplet.current.lon;
-					_alt_sp = _pos_sp_triplet.current.alt;
+					/* project setpoint to local frame */
+					map_projection_project(&_ref_pos,
+							       _pos_sp_triplet.current.lat, _pos_sp_triplet.current.lon,
+							       &_pos_sp.data[0], &_pos_sp.data[1]);
+					_pos_sp(2) = -(_pos_sp_triplet.current.alt - _ref_alt);
 
 					/* update yaw setpoint if needed */
 					if (isfinite(_pos_sp_triplet.current.yaw)) {
@@ -701,11 +690,25 @@ MulticopterPositionControl::task_main()
 
 				} else {
 					/* no waypoint, loiter, reset position setpoint if needed */
-					reset_lat_lon_sp();
+					reset_pos_sp();
 					reset_alt_sp();
 				}
 			}
 
+			/* fill local position setpoint */
+			_local_pos_sp.x = _pos_sp(0);
+			_local_pos_sp.y = _pos_sp(1);
+			_local_pos_sp.z = _pos_sp(2);
+			_local_pos_sp.yaw = _att_sp.yaw_body;
+
+			/* publish local position setpoint */
+			if (_local_pos_sp_pub > 0) {
+				orb_publish(ORB_ID(vehicle_local_position_setpoint), _local_pos_sp_pub, &_local_pos_sp);
+
+			} else {
+				_local_pos_sp_pub = orb_advertise(ORB_ID(vehicle_local_position_setpoint), &_local_pos_sp);
+			}
+
 			if (!_control_mode.flag_control_manual_enabled && _pos_sp_triplet.current.valid && _pos_sp_triplet.current.type == SETPOINT_TYPE_IDLE) {
 				/* idle state, don't run controller and set zero thrust */
 				R.identity();
@@ -729,9 +732,7 @@ MulticopterPositionControl::task_main()
 
 			} else {
 				/* run position & altitude controllers, calculate velocity setpoint */
-				math::Vector<3> pos_err;
-				get_vector_to_next_waypoint_fast(_global_pos.lat, _global_pos.lon, _lat_sp, _lon_sp, &pos_err.data[0], &pos_err.data[1]);
-				pos_err(2) = -(_alt_sp - alt);
+				math::Vector<3> pos_err = _pos_sp - _pos;
 
 				_vel_sp = pos_err.emult(_params.pos_p) + sp_move_rate.emult(_params.vel_ff);
 
@@ -741,7 +742,7 @@ MulticopterPositionControl::task_main()
 				}
 
 				if (!_control_mode.flag_control_position_enabled) {
-					_reset_lat_lon_sp = true;
+					_reset_pos_sp = true;
 					_vel_sp(0) = 0.0f;
 					_vel_sp(1) = 0.0f;
 				}
@@ -780,7 +781,7 @@ MulticopterPositionControl::task_main()
 							float i = _params.thr_min;
 
 							if (reset_int_z_manual) {
-								i = _manual.throttle;
+								i = _manual.z;
 
 								if (i < _params.thr_min) {
 									i = _params.thr_min;
@@ -839,16 +840,17 @@ MulticopterPositionControl::task_main()
 						thr_min = 0.0f;
 					}
 
-					float tilt_max = _params.tilt_max;
+					float tilt_max = _params.tilt_max_air;
 
 					/* adjust limits for landing mode */
 					if (!_control_mode.flag_control_manual_enabled && _pos_sp_triplet.current.valid &&
 					    _pos_sp_triplet.current.type == SETPOINT_TYPE_LAND) {
 						/* limit max tilt and min lift when landing */
-						tilt_max = _params.land_tilt_max;
+						tilt_max = _params.tilt_max_land;
 
-						if (thr_min < 0.0f)
+						if (thr_min < 0.0f) {
 							thr_min = 0.0f;
+						}
 					}
 
 					/* limit min lift */
@@ -859,7 +861,7 @@ MulticopterPositionControl::task_main()
 
 					if (_control_mode.flag_control_velocity_enabled) {
 						/* limit max tilt */
-						if (thr_min >= 0.0f && tilt_max < M_PI / 2 - 0.05f) {
+						if (thr_min >= 0.0f && tilt_max < M_PI_F / 2 - 0.05f) {
 							/* absolute horizontal thrust */
 							float thrust_sp_xy_len = math::Vector<2>(thrust_sp(0), thrust_sp(1)).length();
 
@@ -939,8 +941,9 @@ MulticopterPositionControl::task_main()
 						thrust_int(2) += vel_err(2) * _params.vel_i(2) * dt;
 
 						/* protection against flipping on ground when landing */
-						if (thrust_int(2) > 0.0f)
+						if (thrust_int(2) > 0.0f) {
 							thrust_int(2) = 0.0f;
+						}
 					}
 
 					/* calculate attitude setpoint from thrust vector */
@@ -999,6 +1002,18 @@ MulticopterPositionControl::task_main()
 						_att_sp.roll_body = euler(0);
 						_att_sp.pitch_body = euler(1);
 						/* yaw already used to construct rot matrix, but actual rotation matrix can have different yaw near singularity */
+
+					} else if (!_control_mode.flag_control_manual_enabled) {
+						/* autonomous altitude control without position control (failsafe landing),
+						 * force level attitude, don't change yaw */
+						R.from_euler(0.0f, 0.0f, _att_sp.yaw_body);
+
+						/* copy rotation matrix to attitude setpoint topic */
+						memcpy(&_att_sp.R_body[0][0], R.data, sizeof(_att_sp.R_body));
+						_att_sp.R_valid = true;
+
+						_att_sp.roll_body = 0.0f;
+						_att_sp.pitch_body = 0.0f;
 					}
 
 					_att_sp.thrust = thrust_abs;
@@ -1021,7 +1036,7 @@ MulticopterPositionControl::task_main()
 		} else {
 			/* position controller disabled, reset setpoints */
 			_reset_alt_sp = true;
-			_reset_lat_lon_sp = true;
+			_reset_pos_sp = true;
 			reset_int_z = true;
 			reset_int_xy = true;
 		}
@@ -1046,7 +1061,7 @@ MulticopterPositionControl::start()
 	_control_task = task_spawn_cmd("mc_pos_control",
 				       SCHED_DEFAULT,
 				       SCHED_PRIORITY_MAX - 5,
-				       2048,
+				       2000,
 				       (main_t)&MulticopterPositionControl::task_main_trampoline,
 				       nullptr);
 
@@ -1060,18 +1075,21 @@ MulticopterPositionControl::start()
 
 int mc_pos_control_main(int argc, char *argv[])
 {
-	if (argc < 1)
+	if (argc < 1) {
 		errx(1, "usage: mc_pos_control {start|stop|status}");
+	}
 
 	if (!strcmp(argv[1], "start")) {
 
-		if (pos_control::g_control != nullptr)
+		if (pos_control::g_control != nullptr) {
 			errx(1, "already running");
+		}
 
 		pos_control::g_control = new MulticopterPositionControl;
 
-		if (pos_control::g_control == nullptr)
+		if (pos_control::g_control == nullptr) {
 			errx(1, "alloc failed");
+		}
 
 		if (OK != pos_control::g_control->start()) {
 			delete pos_control::g_control;
@@ -1083,8 +1101,9 @@ int mc_pos_control_main(int argc, char *argv[])
 	}
 
 	if (!strcmp(argv[1], "stop")) {
-		if (pos_control::g_control == nullptr)
+		if (pos_control::g_control == nullptr) {
 			errx(1, "not running");
+		}
 
 		delete pos_control::g_control;
 		pos_control::g_control = nullptr;
diff --git a/src/modules/mc_pos_control/mc_pos_control_params.c b/src/modules/mc_pos_control/mc_pos_control_params.c
index 0082a5e6a..05ab5769b 100644
--- a/src/modules/mc_pos_control/mc_pos_control_params.c
+++ b/src/modules/mc_pos_control/mc_pos_control_params.c
@@ -35,6 +35,8 @@
 /**
  * @file mc_pos_control_params.c
  * Multicopter position controller parameters.
+ *
+ * @author Anton Babushkin <anton.babushkin@me.com>
  */
 
 #include <systemlib/param/param.h>
@@ -98,8 +100,9 @@ PARAM_DEFINE_FLOAT(MPC_Z_VEL_D, 0.0f);
 /**
  * Maximum vertical velocity
  *
- * Maximum vertical velocity in AUTO mode and endpoint for stabilized modes (SEATBELT, EASY).
+ * Maximum vertical velocity in AUTO mode and endpoint for stabilized modes (ALTCTRL, POSCTRL).
  *
+ * @unit m/s
  * @min 0.0
  * @group Multicopter Position Control
  */
@@ -108,7 +111,7 @@ PARAM_DEFINE_FLOAT(MPC_Z_VEL_MAX, 5.0f);
 /**
  * Vertical velocity feed forward
  *
- * Feed forward weight for altitude control in stabilized modes (SEATBELT, EASY). 0 will give slow responce and no overshot, 1 - fast responce and big overshot.
+ * Feed forward weight for altitude control in stabilized modes (ALTCTRL, POSCTRL). 0 will give slow responce and no overshot, 1 - fast responce and big overshot.
  *
  * @min 0.0
  * @max 1.0
@@ -153,8 +156,9 @@ PARAM_DEFINE_FLOAT(MPC_XY_VEL_D, 0.01f);
 /**
  * Maximum horizontal velocity
  *
- * Maximum horizontal velocity in AUTO mode and endpoint for position stabilized mode (EASY).
+ * Maximum horizontal velocity in AUTO mode and endpoint for position stabilized mode (POSCTRL).
  *
+ * @unit m/s
  * @min 0.0
  * @group Multicopter Position Control
  */
@@ -163,7 +167,7 @@ PARAM_DEFINE_FLOAT(MPC_XY_VEL_MAX, 5.0f);
 /**
  * Horizontal velocity feed forward
  *
- * Feed forward weight for position control in position control mode (EASY). 0 will give slow responce and no overshot, 1 - fast responce and big overshot.
+ * Feed forward weight for position control in position control mode (POSCTRL). 0 will give slow responce and no overshot, 1 - fast responce and big overshot.
  *
  * @min 0.0
  * @max 1.0
@@ -172,31 +176,35 @@ PARAM_DEFINE_FLOAT(MPC_XY_VEL_MAX, 5.0f);
 PARAM_DEFINE_FLOAT(MPC_XY_FF, 0.5f);
 
 /**
- * Maximum tilt
+ * Maximum tilt angle in air
  *
- * Limits maximum tilt in AUTO and EASY modes.
+ * Limits maximum tilt in AUTO and POSCTRL modes during flight.
  *
+ * @unit deg
  * @min 0.0
- * @max 1.57
+ * @max 90.0
  * @group Multicopter Position Control
  */
-PARAM_DEFINE_FLOAT(MPC_TILT_MAX, 1.0f);
+PARAM_DEFINE_FLOAT(MPC_TILTMAX_AIR, 45.0f);
 
 /**
- * Landing descend rate
+ * Maximum tilt during landing
  *
+ * Limits maximum tilt angle on landing.
+ *
+ * @unit deg
  * @min 0.0
+ * @max 90.0
  * @group Multicopter Position Control
  */
-PARAM_DEFINE_FLOAT(MPC_LAND_SPEED, 1.0f);
+PARAM_DEFINE_FLOAT(MPC_TILTMAX_LND, 15.0f);
 
 /**
- * Maximum landing tilt
- *
- * Limits maximum tilt on landing.
+ * Landing descend rate
  *
+ * @unit m/s
  * @min 0.0
- * @max 1.57
  * @group Multicopter Position Control
  */
-PARAM_DEFINE_FLOAT(MPC_LAND_TILT, 0.3f);
+PARAM_DEFINE_FLOAT(MPC_LAND_SPEED, 1.0f);
+
diff --git a/src/modules/navigator/geofence.cpp b/src/modules/navigator/geofence.cpp
index f452a85f7..266215308 100644
--- a/src/modules/navigator/geofence.cpp
+++ b/src/modules/navigator/geofence.cpp
@@ -1,8 +1,6 @@
 /****************************************************************************
  *
  *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
- *   Author: @author Jean Cyr <jean.m.cyr@gmail.com>
- *           @author Thomas Gubler <thomasgubler@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -35,6 +33,9 @@
 /**
  * @file geofence.cpp
  * Provides functions for handling the geofence
+ *
+ * @author Jean Cyr <jean.m.cyr@gmail.com>
+ * @author Thomas Gubler <thomasgubler@gmail.com>
  */
 #include "geofence.h"
 
@@ -77,7 +78,7 @@ bool Geofence::inside(const struct vehicle_global_position_s *vehicle)
 {
 	double lat = vehicle->lat / 1e7d;
 	double lon = vehicle->lon / 1e7d;
-	float	alt = vehicle->alt;
+	//float	alt = vehicle->alt;
 
 	return inside(lat, lon, vehicle->alt);
 }
@@ -115,9 +116,9 @@ bool Geofence::inside(double lat, double lon, float altitude)
 				}
 
 				// skip vertex 0 (return point)
-				if (((temp_vertex_i.lon) >= lon != (temp_vertex_j.lon >= lon)) &&
-							(lat <= (temp_vertex_j.lat - temp_vertex_i.lat) * (lon - temp_vertex_i.lon) /
-							 (temp_vertex_j.lon - temp_vertex_i.lon) + temp_vertex_i.lat)) {
+				if (((double)temp_vertex_i.lon >= lon) != ((double)temp_vertex_j.lon >= lon) &&
+							(lat <= (double)(temp_vertex_j.lat - temp_vertex_i.lat) * (lon - (double)temp_vertex_i.lon) /
+							 (double)(temp_vertex_j.lon - temp_vertex_i.lon) + (double)temp_vertex_i.lat)) {
 							c = !c;
 				}
 
@@ -293,4 +294,5 @@ Geofence::loadFromFile(const char *filename)
 int Geofence::clearDm()
 {
 	dm_clear(DM_KEY_FENCE_POINTS);
+	return OK;
 }
diff --git a/src/modules/navigator/geofence.h b/src/modules/navigator/geofence.h
index 9628b7271..2eb126ab5 100644
--- a/src/modules/navigator/geofence.h
+++ b/src/modules/navigator/geofence.h
@@ -1,8 +1,6 @@
 /****************************************************************************
  *
  *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
- *   Author: @author Jean Cyr <jean.m.cyr@gmail.com>
- *           @author Thomas Gubler <thomasgubler@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -35,6 +33,9 @@
 /**
  * @file geofence.h
  * Provides functions for handling the geofence
+ *
+ * @author Jean Cyr <jean.m.cyr@gmail.com>
+ * @author Thomas Gubler <thomasgubler@gmail.com>
  */
 
 #ifndef GEOFENCE_H_
diff --git a/src/modules/navigator/geofence_params.c b/src/modules/navigator/geofence_params.c
index 5831a0ca9..653b1ad84 100644
--- a/src/modules/navigator/geofence_params.c
+++ b/src/modules/navigator/geofence_params.c
@@ -1,7 +1,6 @@
 /****************************************************************************
  *
  *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
- *   Author: Lorenz Meier <lm@inf.ethz.ch>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/src/modules/position_estimator_mc/position_estimator_mc_params.h b/src/modules/navigator/loiter.cpp
index c4c95f7b4..542483fb1 100755..100644
--- a/src/modules/position_estimator_mc/position_estimator_mc_params.h
+++ b/src/modules/navigator/loiter.cpp
@@ -1,9 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: 	Damian Aregger <daregger@student.ethz.ch>
- *   			Tobias Naegeli <naegelit@student.ethz.ch>
- *				Lorenz Meier <lm@inf.ethz.ch>
+ *   Copyright (c) 2013-2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -33,37 +30,49 @@
  * POSSIBILITY OF SUCH DAMAGE.
  *
  ****************************************************************************/
-
-/*
- * @file position_estimator_mc_params.h
- * 
- * Parameters for Position Estimator
+/**
+ * @file loiter.cpp
+ *
+ * Helper class to loiter
+ *
+ * @author Julian Oes <julian@oes.ch>
  */
 
-#include <systemlib/param/param.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <math.h>
+#include <fcntl.h>
 
-struct position_estimator_mc_params {
-	float addNoise;
-	float sigma;
-	float R;
-	int baro; /* consider barometer */
-};
+#include <mavlink/mavlink_log.h>
+#include <systemlib/err.h>
 
-struct position_estimator_mc_param_handles {
-	param_t addNoise;
-	param_t sigma;
-	param_t r;
-	param_t baro_param_handle;
-};
+#include <uORB/uORB.h>
+#include <uORB/topics/position_setpoint_triplet.h>
 
-/**
- * Initialize all parameter handles and values
- *
- */
-int parameters_init(struct position_estimator_mc_param_handles *h);
+#include "loiter.h"
 
-/**
- * Update all parameters
- *
- */
-int parameters_update(const struct position_estimator_mc_param_handles *h, struct position_estimator_mc_params *p);
+Loiter::Loiter(Navigator *navigator, const char *name) :
+	MissionBlock(navigator, name)
+{
+	/* load initial params */
+	updateParams();
+	/* initial reset */
+	on_inactive();
+}
+
+Loiter::~Loiter()
+{
+}
+
+bool
+Loiter::on_active(struct position_setpoint_triplet_s *pos_sp_triplet)
+{
+	/* set loiter item, don't reuse an existing position setpoint */
+	return set_loiter_item(pos_sp_triplet);
+}
+
+void
+Loiter::on_inactive()
+{
+}
diff --git a/src/modules/navigator/loiter.h b/src/modules/navigator/loiter.h
new file mode 100644
index 000000000..65ff5c31e
--- /dev/null
+++ b/src/modules/navigator/loiter.h
@@ -0,0 +1,74 @@
+/***************************************************************************
+ *
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+/**
+ * @file loiter.h
+ *
+ * Helper class to loiter
+ *
+ * @author Julian Oes <julian@oes.ch>
+ */
+
+#ifndef NAVIGATOR_LOITER_H
+#define NAVIGATOR_LOITER_H
+
+#include <controllib/blocks.hpp>
+#include <controllib/block/BlockParam.hpp>
+
+#include "navigator_mode.h"
+#include "mission_block.h"
+
+class Loiter : public MissionBlock
+{
+public:
+	/**
+	 * Constructor
+	 */
+	Loiter(Navigator *navigator, const char *name);
+
+	/**
+	 * Destructor
+	 */
+	~Loiter();
+
+	/**
+	 * This function is called while the mode is inactive
+	 */
+	virtual void on_inactive();
+
+	/**
+	 * This function is called while the mode is active
+	 */
+	virtual bool on_active(struct position_setpoint_triplet_s *pos_sp_triplet);
+};
+
+#endif
diff --git a/src/modules/navigator/mission.cpp b/src/modules/navigator/mission.cpp
new file mode 100644
index 000000000..72255103b
--- /dev/null
+++ b/src/modules/navigator/mission.cpp
@@ -0,0 +1,461 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2013-2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+/**
+ * @file navigator_mission.cpp
+ *
+ * Helper class to access missions
+ *
+ * @author Julian Oes <julian@oes.ch>
+ */
+
+#include <sys/types.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <drivers/drv_hrt.h>
+
+#include <dataman/dataman.h>
+#include <mavlink/mavlink_log.h>
+#include <systemlib/err.h>
+#include <geo/geo.h>
+
+#include <uORB/uORB.h>
+#include <uORB/topics/mission.h>
+#include <uORB/topics/mission_result.h>
+
+#include "navigator.h"
+#include "mission.h"
+
+Mission::Mission(Navigator *navigator, const char *name) :
+	MissionBlock(navigator, name),
+	_param_onboard_enabled(this, "ONBOARD_EN"),
+	_onboard_mission({0}),
+	_offboard_mission({0}),
+	_current_onboard_mission_index(-1),
+	_current_offboard_mission_index(-1),
+	_mission_result_pub(-1),
+	_mission_result({0}),
+	_mission_type(MISSION_TYPE_NONE)
+{
+	/* load initial params */
+	updateParams();
+	/* set initial mission items */
+	on_inactive();
+
+}
+
+Mission::~Mission()
+{
+}
+
+void
+Mission::on_inactive()
+{
+	_first_run = true;
+
+	/* check anyway if missions have changed so that feedback to groundstation is given */
+	bool onboard_updated;
+	orb_check(_navigator->get_onboard_mission_sub(), &onboard_updated);
+	if (onboard_updated) {
+		update_onboard_mission();
+	}
+
+	bool offboard_updated;
+	orb_check(_navigator->get_offboard_mission_sub(), &offboard_updated);
+	if (offboard_updated) {
+		update_offboard_mission();
+	}
+}
+
+bool
+Mission::on_active(struct position_setpoint_triplet_s *pos_sp_triplet)
+{
+	bool updated = false;
+
+	/* check if anything has changed */
+	bool onboard_updated;
+	orb_check(_navigator->get_onboard_mission_sub(), &onboard_updated);
+	if (onboard_updated) {
+		update_onboard_mission();
+	}
+
+	bool offboard_updated;
+	orb_check(_navigator->get_offboard_mission_sub(), &offboard_updated);
+	if (offboard_updated) {
+		update_offboard_mission();
+	}
+
+	/* reset mission items if needed */
+	if (onboard_updated || offboard_updated || _first_run) {
+		set_mission_items(pos_sp_triplet);
+		updated = true;
+		_first_run = false;
+	}
+
+	/* lets check if we reached the current mission item */
+	if (_mission_type != MISSION_TYPE_NONE && is_mission_item_reached()) {
+		advance_mission();
+		set_mission_items(pos_sp_triplet);
+		updated = true;
+	}
+
+	return updated;
+}
+
+void
+Mission::update_onboard_mission()
+{
+	if (orb_copy(ORB_ID(onboard_mission), _navigator->get_onboard_mission_sub(), &_onboard_mission) == OK) {
+		/* accept the current index set by the onboard mission if it is within bounds */
+		if (_onboard_mission.current_index >=0
+		&& _onboard_mission.current_index < (int)_onboard_mission.count) {
+			_current_onboard_mission_index = _onboard_mission.current_index;
+		} else {
+			/* if less WPs available, reset to first WP */
+			if (_current_onboard_mission_index >= (int)_onboard_mission.count) {
+				_current_onboard_mission_index = 0;
+			/* if not initialized, set it to 0 */
+			} else if (_current_onboard_mission_index < 0) {
+				_current_onboard_mission_index = 0;
+			}
+			/* otherwise, just leave it */
+		}
+	} else {
+		_onboard_mission.count = 0;
+		_onboard_mission.current_index = 0;
+		_current_onboard_mission_index = 0;
+	}
+}
+
+void
+Mission::update_offboard_mission()
+{
+	if (orb_copy(ORB_ID(offboard_mission), _navigator->get_offboard_mission_sub(), &_offboard_mission) == OK) {
+
+		/* determine current index */
+		if (_offboard_mission.current_index >= 0
+		    && _offboard_mission.current_index < (int)_offboard_mission.count) {
+			_current_offboard_mission_index = _offboard_mission.current_index;
+		} else {
+			/* if less WPs available, reset to first WP */
+			if (_current_offboard_mission_index >= (int)_offboard_mission.count) {
+				_current_offboard_mission_index = 0;
+			/* if not initialized, set it to 0 */
+			} else if (_current_offboard_mission_index < 0) {
+				_current_offboard_mission_index = 0;
+			}
+			/* otherwise, just leave it */
+		}
+
+		/* Check mission feasibility, for now do not handle the return value,
+		 * however warnings are issued to the gcs via mavlink from inside the MissionFeasiblityChecker */
+		dm_item_t dm_current;
+
+		if (_offboard_mission.dataman_id == 0) {
+			dm_current = DM_KEY_WAYPOINTS_OFFBOARD_0;
+		} else {
+			dm_current = DM_KEY_WAYPOINTS_OFFBOARD_1;
+		}
+
+		missionFeasiblityChecker.checkMissionFeasible(_navigator->get_vstatus()->is_rotary_wing, dm_current,
+			                                      (size_t)_offboard_mission.count,
+							      _navigator->get_geofence(),
+							      _navigator->get_home_position()->alt);
+	} else {
+		_offboard_mission.count = 0;
+		_offboard_mission.current_index = 0;
+		_current_offboard_mission_index = 0;
+	}
+	report_current_offboard_mission_item();
+}
+
+
+void
+Mission::advance_mission()
+{
+	switch (_mission_type) {
+	case MISSION_TYPE_ONBOARD:
+		_current_onboard_mission_index++;
+		break;
+
+	case MISSION_TYPE_OFFBOARD:
+		_current_offboard_mission_index++;
+		break;
+
+	case MISSION_TYPE_NONE:
+	default:
+		break;
+	}
+}
+
+void
+Mission::set_mission_items(struct position_setpoint_triplet_s *pos_sp_triplet)
+{
+	set_previous_pos_setpoint(pos_sp_triplet);
+
+	/* try setting onboard mission item */
+	if (is_current_onboard_mission_item_set(&pos_sp_triplet->current)) {
+		/* if mission type changed, notify */
+		if (_mission_type != MISSION_TYPE_ONBOARD) {
+			mavlink_log_info(_navigator->get_mavlink_fd(),
+					"#audio: onboard mission running");
+		}
+		_mission_type = MISSION_TYPE_ONBOARD;
+		_navigator->set_can_loiter_at_sp(false);
+
+	/* try setting offboard mission item */
+	} else if (is_current_offboard_mission_item_set(&pos_sp_triplet->current)) {
+		/* if mission type changed, notify */
+		if (_mission_type != MISSION_TYPE_OFFBOARD) {
+			mavlink_log_info(_navigator->get_mavlink_fd(),
+					"#audio: offboard mission running");
+		}
+		_mission_type = MISSION_TYPE_OFFBOARD;
+		_navigator->set_can_loiter_at_sp(false);
+	} else {
+		if (_mission_type != MISSION_TYPE_NONE) {
+			mavlink_log_info(_navigator->get_mavlink_fd(),
+					"#audio: mission finished");
+		} else {
+			mavlink_log_info(_navigator->get_mavlink_fd(),
+					"#audio: no mission available");
+		}
+		_mission_type = MISSION_TYPE_NONE;
+        _navigator->set_can_loiter_at_sp(pos_sp_triplet->current.valid && _waypoint_position_reached);
+
+		set_loiter_item(pos_sp_triplet);
+		reset_mission_item_reached();
+		report_mission_finished();
+	}
+}
+
+bool
+Mission::is_current_onboard_mission_item_set(struct position_setpoint_s *current_pos_sp)
+{
+	/* make sure param is up to date */
+	updateParams();
+	if (_param_onboard_enabled.get() > 0 &&
+	    _current_onboard_mission_index >= 0&&
+	    _current_onboard_mission_index < (int)_onboard_mission.count) {
+		struct mission_item_s new_mission_item;
+		if (read_mission_item(DM_KEY_WAYPOINTS_ONBOARD, true, &_current_onboard_mission_index,
+					&new_mission_item)) {
+			/* convert the current mission item and set it valid */
+			mission_item_to_position_setpoint(&new_mission_item, current_pos_sp);
+			current_pos_sp->valid = true;
+
+			reset_mission_item_reached();
+
+			/* TODO: report this somehow */
+			memcpy(&_mission_item, &new_mission_item, sizeof(struct mission_item_s));
+			return true;
+		}
+	}
+	return false;
+}
+
+bool
+Mission::is_current_offboard_mission_item_set(struct position_setpoint_s *current_pos_sp)
+{
+	if (_current_offboard_mission_index >= 0 &&
+	    _current_offboard_mission_index < (int)_offboard_mission.count) {
+		dm_item_t dm_current;
+		if (_offboard_mission.dataman_id == 0) {
+			dm_current = DM_KEY_WAYPOINTS_OFFBOARD_0;
+		} else {
+			dm_current = DM_KEY_WAYPOINTS_OFFBOARD_1;
+		}
+		struct mission_item_s new_mission_item;
+		if (read_mission_item(dm_current, true, &_current_offboard_mission_index, &new_mission_item)) {
+			/* convert the current mission item and set it valid */
+			mission_item_to_position_setpoint(&new_mission_item, current_pos_sp);
+			current_pos_sp->valid = true;
+
+			reset_mission_item_reached();
+
+			report_current_offboard_mission_item();
+			memcpy(&_mission_item, &new_mission_item, sizeof(struct mission_item_s));
+			return true;
+		}
+	}
+	return false;
+}
+
+void
+Mission::get_next_onboard_mission_item(struct position_setpoint_s *next_pos_sp)
+{
+	int next_temp_mission_index = _onboard_mission.current_index + 1;
+
+	/* try if there is a next onboard mission */
+	if (_onboard_mission.current_index >= 0 &&
+	    next_temp_mission_index < (int)_onboard_mission.count) {
+		struct mission_item_s new_mission_item;
+		if (read_mission_item(DM_KEY_WAYPOINTS_ONBOARD, false, &next_temp_mission_index, &new_mission_item)) {
+			/* convert next mission item to position setpoint */
+			mission_item_to_position_setpoint(&new_mission_item, next_pos_sp);
+			next_pos_sp->valid = true;
+			return;
+		}
+	}
+
+	/* give up */
+	next_pos_sp->valid = false;
+	return;
+}
+
+void
+Mission::get_next_offboard_mission_item(struct position_setpoint_s *next_pos_sp)
+{
+	/* try if there is a next offboard mission */
+	int next_temp_mission_index = _offboard_mission.current_index + 1;
+	warnx("next index: %d, count; %d", next_temp_mission_index, _offboard_mission.count);
+	if (_offboard_mission.current_index >= 0 &&
+	    next_temp_mission_index < (int)_offboard_mission.count) {
+		dm_item_t dm_current;
+		if (_offboard_mission.dataman_id == 0) {
+			dm_current = DM_KEY_WAYPOINTS_OFFBOARD_0;
+		} else {
+			dm_current = DM_KEY_WAYPOINTS_OFFBOARD_1;
+		}
+		struct mission_item_s new_mission_item;
+		if (read_mission_item(dm_current, false, &next_temp_mission_index, &new_mission_item)) {
+			/* convert next mission item to position setpoint */
+			mission_item_to_position_setpoint(&new_mission_item, next_pos_sp);
+			next_pos_sp->valid = true;
+			return;
+		}
+	}
+	/* give up */
+	next_pos_sp->valid = false;
+	return;
+}
+
+bool
+Mission::read_mission_item(const dm_item_t dm_item, bool is_current, int *mission_index,
+		           struct mission_item_s *new_mission_item)
+{
+	/* repeat several to get the mission item because we might have to follow multiple DO_JUMPS */
+	for (int i=0; i<10; i++) {
+		const ssize_t len = sizeof(struct mission_item_s);
+
+		/* read mission item from datamanager */
+		if (dm_read(dm_item, *mission_index, new_mission_item, len) != len) {
+			/* not supposed to happen unless the datamanager can't access the SD card, etc. */
+			mavlink_log_critical(_navigator->get_mavlink_fd(),
+			                     "#audio: ERROR waypoint could not be read");
+			return false;
+		}
+
+		/* check for DO_JUMP item, and whether it hasn't not already been repeated enough times */
+		if (new_mission_item->nav_cmd == NAV_CMD_DO_JUMP) {
+
+			/* do DO_JUMP as many times as requested */
+			if (new_mission_item->do_jump_current_count < new_mission_item->do_jump_repeat_count) {
+
+				/* only raise the repeat count if this is for the current mission item
+				* but not for the next mission item */
+				if (is_current) {
+					(new_mission_item->do_jump_current_count)++;
+					/* save repeat count */
+					if (dm_write(dm_item, *mission_index, DM_PERSIST_IN_FLIGHT_RESET,
+						new_mission_item, len) != len) {
+						/* not supposed to happen unless the datamanager can't access the
+						 * dataman */
+						mavlink_log_critical(_navigator->get_mavlink_fd(),
+								"#audio: ERROR DO JUMP waypoint could not be written");
+						return false;
+					}
+				}
+				/* set new mission item index and repeat
+				* we don't have to validate here, if it's invalid, we should realize this later .*/
+				*mission_index = new_mission_item->do_jump_mission_index;
+			} else {
+				mavlink_log_info(_navigator->get_mavlink_fd(),
+						 "#audio: DO JUMP repetitions completed");
+				/* no more DO_JUMPS, therefore just try to continue with next mission item */
+				(*mission_index)++;
+			}
+
+		} else {
+			/* if it's not a DO_JUMP, then we were successful */
+			return true;
+		}
+	}
+
+	/* we have given up, we don't want to cycle forever */
+	mavlink_log_critical(_navigator->get_mavlink_fd(),
+			     "#audio: ERROR DO JUMP is cycling, giving up");
+	return false;
+}
+
+void
+Mission::report_mission_item_reached()
+{
+	if (_mission_type == MISSION_TYPE_OFFBOARD) {
+		_mission_result.mission_reached = true;
+		_mission_result.mission_index_reached = _current_offboard_mission_index;
+	}
+	publish_mission_result();
+}
+
+void
+Mission::report_current_offboard_mission_item()
+{
+	_mission_result.index_current_mission = _current_offboard_mission_index;
+	publish_mission_result();
+}
+
+void
+Mission::report_mission_finished()
+{
+	_mission_result.mission_finished = true;
+	publish_mission_result();
+}
+
+void
+Mission::publish_mission_result()
+{
+	/* lazily publish the mission result only once available */
+	if (_mission_result_pub > 0) {
+		/* publish mission result */
+		orb_publish(ORB_ID(mission_result), _mission_result_pub, &_mission_result);
+
+	} else {
+		/* advertise and publish */
+		_mission_result_pub = orb_advertise(ORB_ID(mission_result), &_mission_result);
+	}
+	/* reset reached bool */
+	_mission_result.mission_reached = false;
+	_mission_result.mission_finished = false;
+}
diff --git a/src/modules/navigator/mission.h b/src/modules/navigator/mission.h
new file mode 100644
index 000000000..6e4761946
--- /dev/null
+++ b/src/modules/navigator/mission.h
@@ -0,0 +1,178 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2013-2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+/**
+ * @file mission.h
+ *
+ * Navigator mode to access missions
+ *
+ * @author Julian Oes <julian@oes.ch>
+ */
+
+#ifndef NAVIGATOR_MISSION_H
+#define NAVIGATOR_MISSION_H
+
+#include <drivers/drv_hrt.h>
+
+#include <controllib/blocks.hpp>
+#include <controllib/block/BlockParam.hpp>
+
+#include <dataman/dataman.h>
+
+#include <uORB/uORB.h>
+#include <uORB/topics/vehicle_global_position.h>
+#include <uORB/topics/position_setpoint_triplet.h>
+#include <uORB/topics/home_position.h>
+#include <uORB/topics/vehicle_status.h>
+#include <uORB/topics/mission.h>
+#include <uORB/topics/mission_result.h>
+
+#include "navigator_mode.h"
+#include "mission_block.h"
+#include "mission_feasibility_checker.h"
+
+class Navigator;
+
+class Mission : public MissionBlock
+{
+public:
+	/**
+	 * Constructor
+	 */
+	Mission(Navigator *navigator, const char *name);
+
+	/**
+	 * Destructor
+	 */
+	virtual ~Mission();
+
+	/**
+	 * This function is called while the mode is inactive
+	 */
+	virtual void on_inactive();
+
+	/**
+	 * This function is called while the mode is active
+	 */
+	virtual bool on_active(struct position_setpoint_triplet_s *pos_sp_triplet);
+
+private:
+	/**
+	 * Update onboard mission topic
+	 */
+	void update_onboard_mission();
+
+	/**
+	 * Update offboard mission topic
+	 */
+	void update_offboard_mission();
+
+	/**
+	 * Move on to next mission item or switch to loiter
+	 */
+	void advance_mission();
+
+	/**
+	 * Set new mission items
+	 */
+	void set_mission_items(struct position_setpoint_triplet_s *pos_sp_triplet);
+
+	/**
+	 * Try to set the current position setpoint from an onboard mission item
+	 * @return true if mission item successfully set
+	 */
+	bool is_current_onboard_mission_item_set(struct position_setpoint_s *current_pos_sp);
+
+	/**
+	 * Try to set the current position setpoint from an offboard mission item
+	 * @return true if mission item successfully set
+	 */
+	bool is_current_offboard_mission_item_set(struct position_setpoint_s *current_pos_sp);
+
+	/**
+	 * Try to set the next position setpoint from an onboard mission item
+	 */
+	void get_next_onboard_mission_item(struct position_setpoint_s *next_pos_sp);
+
+	/**
+	 * Try to set the next position setpoint from an offboard mission item
+	 */
+	void get_next_offboard_mission_item(struct position_setpoint_s *next_pos_sp);
+
+	/**
+	 * Read a mission item from the dataman and watch out for DO_JUMPS
+	 * @return true if successful
+	 */
+	bool read_mission_item(const dm_item_t dm_item, bool is_current, int *mission_index,
+			       struct mission_item_s *new_mission_item);
+
+	/**
+	 * Report that a mission item has been reached
+	 */
+	void report_mission_item_reached();
+
+	/**
+	 * Rport the current mission item
+	 */
+	void report_current_offboard_mission_item();
+
+	/**
+	 * Report that the mission is finished if one exists or that none exists
+	 */
+	void report_mission_finished();
+
+	/**
+	 * Publish the mission result so commander and mavlink know what is going on
+	 */
+	void publish_mission_result();
+
+	control::BlockParamFloat _param_onboard_enabled;
+
+	struct mission_s _onboard_mission;
+	struct mission_s _offboard_mission;
+
+	int _current_onboard_mission_index;
+	int _current_offboard_mission_index;
+
+	orb_advert_t _mission_result_pub;
+	struct mission_result_s _mission_result;
+
+	enum {
+		MISSION_TYPE_NONE,
+		MISSION_TYPE_ONBOARD,
+		MISSION_TYPE_OFFBOARD
+	} _mission_type;
+
+	MissionFeasibilityChecker missionFeasiblityChecker; /**< class that checks if a mission is feasible */
+};
+
+#endif
diff --git a/src/modules/navigator/mission_block.cpp b/src/modules/navigator/mission_block.cpp
new file mode 100644
index 000000000..26a573544
--- /dev/null
+++ b/src/modules/navigator/mission_block.cpp
@@ -0,0 +1,244 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+/**
+ * @file mission_block.cpp
+ *
+ * Helper class to use mission items
+ *
+ * @author Julian Oes <julian@oes.ch>
+ */
+
+#include <sys/types.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <math.h>
+#include <float.h>
+
+#include <systemlib/err.h>
+#include <geo/geo.h>
+
+#include <uORB/uORB.h>
+
+#include "navigator.h"
+#include "mission_block.h"
+
+
+MissionBlock::MissionBlock(Navigator *navigator, const char *name) :
+	NavigatorMode(navigator, name),
+	_waypoint_position_reached(false),
+	_waypoint_yaw_reached(false),
+	_time_first_inside_orbit(0),
+	_mission_item({0}),
+	_mission_item_valid(false)
+{
+}
+
+MissionBlock::~MissionBlock()
+{
+}
+
+bool
+MissionBlock::is_mission_item_reached()
+{
+	if (_mission_item.nav_cmd == NAV_CMD_LAND) {
+		return _navigator->get_vstatus()->condition_landed;
+	}
+
+	/* TODO: count turns */
+	if ((/*_mission_item.nav_cmd == NAV_CMD_LOITER_TURN_COUNT ||*/
+	     _mission_item.nav_cmd == NAV_CMD_LOITER_UNLIMITED)) {
+		return false;
+	}
+
+	hrt_abstime now = hrt_absolute_time();
+
+	if (!_waypoint_position_reached) {
+
+		float dist = -1.0f;
+		float dist_xy = -1.0f;
+		float dist_z = -1.0f;
+
+		float altitude_amsl = _mission_item.altitude_is_relative
+				      ? _mission_item.altitude + _navigator->get_home_position()->alt
+			              : _mission_item.altitude;
+
+		dist = get_distance_to_point_global_wgs84(_mission_item.lat, _mission_item.lon, altitude_amsl,
+				                          _navigator->get_global_position()->lat,
+							  _navigator->get_global_position()->lon,
+							  _navigator->get_global_position()->alt,
+				&dist_xy, &dist_z);
+
+		if (_mission_item.nav_cmd == NAV_CMD_TAKEOFF && _navigator->get_vstatus()->is_rotary_wing) {
+			/* require only altitude for takeoff for multicopter */
+			if (_navigator->get_global_position()->alt >
+				altitude_amsl - _navigator->get_acceptance_radius()) {
+				_waypoint_position_reached = true;
+			}
+		} else if (_mission_item.nav_cmd == NAV_CMD_TAKEOFF) {
+			/* for takeoff mission items use the parameter for the takeoff acceptance radius */
+			if (dist >= 0.0f && dist <= _navigator->get_acceptance_radius()) {
+				_waypoint_position_reached = true;
+			}
+		} else {
+			/* for normal mission items used their acceptance radius */
+			if (dist >= 0.0f && dist <= _mission_item.acceptance_radius) {
+				_waypoint_position_reached = true;
+			}
+		}
+	}
+
+	if (_waypoint_position_reached && !_waypoint_yaw_reached) {
+
+		/* TODO: removed takeoff, why? */
+		if (_navigator->get_vstatus()->is_rotary_wing && isfinite(_mission_item.yaw)) {
+
+			/* check yaw if defined only for rotary wing except takeoff */
+			float yaw_err = _wrap_pi(_mission_item.yaw - _navigator->get_global_position()->yaw);
+
+			if (fabsf(yaw_err) < 0.2f) { /* TODO: get rid of magic number */
+				_waypoint_yaw_reached = true;
+			}
+
+		} else {
+			_waypoint_yaw_reached = true;
+		}
+	}
+
+	/* check if the current waypoint was reached */
+	if (_waypoint_position_reached && _waypoint_yaw_reached) {
+
+		if (_time_first_inside_orbit == 0) {
+			_time_first_inside_orbit = now;
+
+			// if (_mission_item.time_inside > 0.01f) {
+			// 	mavlink_log_info(_mavlink_fd, "#audio: waypoint reached, wait for %.1fs",
+			// 		(double)_mission_item.time_inside);
+			// }
+		}
+
+		/* check if the MAV was long enough inside the waypoint orbit */
+		if (now - _time_first_inside_orbit >= (hrt_abstime)_mission_item.time_inside * 1e6f) {
+			return true;
+		}
+	}
+	return false;
+}
+
+void
+MissionBlock::reset_mission_item_reached()
+{
+	_waypoint_position_reached = false;
+	_waypoint_yaw_reached = false;
+	_time_first_inside_orbit = 0;
+}
+
+void
+MissionBlock::mission_item_to_position_setpoint(const struct mission_item_s *item, struct position_setpoint_s *sp)
+{
+	sp->valid = true;
+	sp->lat = item->lat;
+	sp->lon = item->lon;
+	sp->alt = item->altitude_is_relative ? item->altitude + _navigator->get_home_position()->alt : item->altitude;
+	sp->yaw = item->yaw;
+	sp->loiter_radius = item->loiter_radius;
+	sp->loiter_direction = item->loiter_direction;
+	sp->pitch_min = item->pitch_min;
+
+	switch (item->nav_cmd) {
+	case NAV_CMD_IDLE:
+		sp->type = SETPOINT_TYPE_IDLE;
+		break;
+
+	case NAV_CMD_TAKEOFF:
+		sp->type = SETPOINT_TYPE_TAKEOFF;
+		break;
+
+	case NAV_CMD_LAND:
+		sp->type = SETPOINT_TYPE_LAND;
+		break;
+
+	case NAV_CMD_LOITER_TIME_LIMIT:
+	case NAV_CMD_LOITER_TURN_COUNT:
+	case NAV_CMD_LOITER_UNLIMITED:
+		sp->type = SETPOINT_TYPE_LOITER;
+		break;
+
+	default:
+		sp->type = SETPOINT_TYPE_POSITION;
+		break;
+	}
+}
+
+void
+MissionBlock::set_previous_pos_setpoint(struct position_setpoint_triplet_s *pos_sp_triplet)
+{
+    /* reuse current setpoint as previous setpoint */
+    if (pos_sp_triplet->current.valid) {
+        memcpy(&pos_sp_triplet->previous, &pos_sp_triplet->current, sizeof(struct position_setpoint_s));
+    }
+}
+
+bool
+MissionBlock::set_loiter_item(struct position_setpoint_triplet_s *pos_sp_triplet)
+{
+    /* don't change setpoint if 'can_loiter_at_sp' flag set */
+	if (!(_navigator->get_can_loiter_at_sp() && pos_sp_triplet->current.valid)) {
+		/* use current position */
+		pos_sp_triplet->current.lat = _navigator->get_global_position()->lat;
+		pos_sp_triplet->current.lon = _navigator->get_global_position()->lon;
+		pos_sp_triplet->current.alt = _navigator->get_global_position()->alt;
+		pos_sp_triplet->current.yaw = NAN;	/* NAN means to use current yaw */
+
+	    _navigator->set_can_loiter_at_sp(true);
+	}
+
+    if (pos_sp_triplet->current.type != SETPOINT_TYPE_LOITER
+            || (fabsf(pos_sp_triplet->current.loiter_radius - _navigator->get_loiter_radius()) > FLT_EPSILON)
+            || pos_sp_triplet->current.loiter_direction != 1
+            || pos_sp_triplet->previous.valid
+            || !pos_sp_triplet->current.valid
+            || pos_sp_triplet->next.valid) {
+        /* position setpoint triplet should be updated */
+        pos_sp_triplet->current.type = SETPOINT_TYPE_LOITER;
+        pos_sp_triplet->current.loiter_radius = _navigator->get_loiter_radius();
+        pos_sp_triplet->current.loiter_direction = 1;
+
+        pos_sp_triplet->previous.valid = false;
+        pos_sp_triplet->current.valid = true;
+        pos_sp_triplet->next.valid = false;
+        return true;
+    }
+
+    return false;
+}
diff --git a/src/modules/navigator/navigator_mission.h b/src/modules/navigator/mission_block.h
index 2bd4da82e..f99002752 100644
--- a/src/modules/navigator/navigator_mission.h
+++ b/src/modules/navigator/mission_block.h
@@ -1,7 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
- *   Author: @author Julian Oes <joes@student.ethz.ch>
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -32,73 +31,76 @@
  *
  ****************************************************************************/
 /**
- * @file navigator_mission.h
- * Helper class to access missions
+ * @file mission_block.h
+ *
+ * Helper class to use mission items
+ *
+ * @author Julian Oes <julian@oes.ch>
  */
 
-#ifndef NAVIGATOR_MISSION_H
-#define NAVIGATOR_MISSION_H
+#ifndef NAVIGATOR_MISSION_BLOCK_H
+#define NAVIGATOR_MISSION_BLOCK_H
+
+#include <drivers/drv_hrt.h>
 
 #include <uORB/topics/mission.h>
-#include <uORB/topics/mission_result.h>
+#include <uORB/topics/vehicle_global_position.h>
+#include <uORB/topics/position_setpoint_triplet.h>
 
+#include "navigator_mode.h"
 
-class __EXPORT Mission
+class Navigator;
+
+class MissionBlock : public NavigatorMode
 {
 public:
 	/**
 	 * Constructor
 	 */
-	Mission();
+	MissionBlock(Navigator *navigator, const char *name);
 
 	/**
-	 * Destructor, also kills the sensors task.
+	 * Destructor
 	 */
-	~Mission();
-
-	void		set_offboard_dataman_id(int new_id);
-	void		set_current_offboard_mission_index(int new_index);
-	void		set_current_onboard_mission_index(int new_index);
-	void		set_offboard_mission_count(unsigned new_count);
-	void		set_onboard_mission_count(unsigned new_count);
-
-	void		set_onboard_mission_allowed(bool allowed);
-
-	bool		current_mission_available();
-	bool		next_mission_available();
-
-	int		get_current_mission_item(struct mission_item_s *mission_item, bool *onboard, unsigned *index);
-	int		get_next_mission_item(struct mission_item_s *mission_item);
-
-	void		move_to_next();
+	virtual ~MissionBlock();
 
-	void		report_mission_item_reached();
-	void		report_current_offboard_mission_item();
-	void		publish_mission_result();
-
-private:
-	bool		current_onboard_mission_available();
-	bool		current_offboard_mission_available();
-	bool		next_onboard_mission_available();
-	bool		next_offboard_mission_available();
+	/**
+	 * Check if mission item has been reached
+	 * @return true if successfully reached
+	 */
+	bool is_mission_item_reached();
+	/**
+	 * Reset all reached flags
+	 */
+	void reset_mission_item_reached();
 
-	int 		_offboard_dataman_id;
-	unsigned	_current_offboard_mission_index;
-	unsigned	_current_onboard_mission_index;
-	unsigned	_offboard_mission_item_count;		/** number of offboard mission items available */
-	unsigned	_onboard_mission_item_count;		/** number of onboard mission items available */
+	/**
+	 * Convert a mission item to a position setpoint
+	 *
+	 * @param the mission item to convert
+	 * @param the position setpoint that needs to be set
+	 */
+	void mission_item_to_position_setpoint(const mission_item_s *item, position_setpoint_s *sp);
 
-	bool		_onboard_mission_allowed;
+    /**
+     * Set previous position setpoint to current setpoint
+     */
+	void set_previous_pos_setpoint(struct position_setpoint_triplet_s *pos_sp_triplet);
 
-	enum {
-		MISSION_TYPE_NONE,
-		MISSION_TYPE_ONBOARD,
-		MISSION_TYPE_OFFBOARD,
-	} 		_current_mission_type;
+	/**
+	 * Set a loiter item, if possible reuse the position setpoint, otherwise take the current position
+	 *
+	 * @param the position setpoint triplet to set
+	 * @return true if setpoint has changed
+	 */
+	bool set_loiter_item(position_setpoint_triplet_s *pos_sp_triplet);
 
-	int		_mission_result_pub;
+	bool _waypoint_position_reached;
+	bool _waypoint_yaw_reached;
+	hrt_abstime _time_first_inside_orbit;
 
-	struct mission_result_s _mission_result;
+	mission_item_s _mission_item;
+	bool _mission_item_valid;
 };
 
 #endif
diff --git a/src/modules/navigator/mission_feasibility_checker.cpp b/src/modules/navigator/mission_feasibility_checker.cpp
index eaafa217d..dd7f4c801 100644
--- a/src/modules/navigator/mission_feasibility_checker.cpp
+++ b/src/modules/navigator/mission_feasibility_checker.cpp
@@ -1,8 +1,6 @@
 /****************************************************************************
  *
  *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
- *   Author: @author Lorenz Meier <lm@inf.ethz.ch>
- *           @author Thomas Gubler <thomasgubler@student.ethz.ch>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -35,6 +33,9 @@
 /**
  * @file mission_feasibility_checker.cpp
  * Provides checks if mission is feasible given the navigation capabilities
+ *
+ * @author Lorenz Meier <lm@inf.ethz.ch>
+ * @author Thomas Gubler <thomasgubler@student.ethz.ch>
  */
 
 #include "mission_feasibility_checker.h"
@@ -62,7 +63,7 @@ MissionFeasibilityChecker::MissionFeasibilityChecker() : _mavlink_fd(-1), _capab
 }
 
 
-bool MissionFeasibilityChecker::checkMissionFeasible(bool isRotarywing, dm_item_t dm_current, size_t nMissionItems, Geofence &geofence)
+bool MissionFeasibilityChecker::checkMissionFeasible(bool isRotarywing, dm_item_t dm_current, size_t nMissionItems, Geofence &geofence, float home_alt)
 {
 	/* Init if not done yet */
 	init();
@@ -75,24 +76,24 @@ bool MissionFeasibilityChecker::checkMissionFeasible(bool isRotarywing, dm_item_
 
 
 	if (isRotarywing)
-		return checkMissionFeasibleRotarywing(dm_current, nMissionItems, geofence);
+		return checkMissionFeasibleRotarywing(dm_current, nMissionItems, geofence, home_alt);
 	else
-		return checkMissionFeasibleFixedwing(dm_current, nMissionItems, geofence);
+		return checkMissionFeasibleFixedwing(dm_current, nMissionItems, geofence, home_alt);
 }
 
-bool MissionFeasibilityChecker::checkMissionFeasibleRotarywing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence)
+bool MissionFeasibilityChecker::checkMissionFeasibleRotarywing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence, float home_alt)
 {
 
-	return checkGeofence(dm_current, nMissionItems, geofence);
+	return  (checkGeofence(dm_current, nMissionItems, geofence) && checkHomePositionAltitude(dm_current, nMissionItems, home_alt));
 }
 
-bool MissionFeasibilityChecker::checkMissionFeasibleFixedwing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence)
+bool MissionFeasibilityChecker::checkMissionFeasibleFixedwing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence, float home_alt)
 {
 	/* Update fixed wing navigation capabilites */
 	updateNavigationCapabilities();
 //	warnx("_nav_caps.landing_slope_angle_rad %.4f, _nav_caps.landing_horizontal_slope_displacement %.4f", _nav_caps.landing_slope_angle_rad, _nav_caps.landing_horizontal_slope_displacement);
 
-	return (checkFixedWingLanding(dm_current, nMissionItems) && checkGeofence(dm_current, nMissionItems, geofence));
+	return (checkFixedWingLanding(dm_current, nMissionItems) && checkGeofence(dm_current, nMissionItems, geofence) && checkHomePositionAltitude(dm_current, nMissionItems, home_alt));
 }
 
 bool MissionFeasibilityChecker::checkGeofence(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence)
@@ -100,15 +101,15 @@ bool MissionFeasibilityChecker::checkGeofence(dm_item_t dm_current, size_t nMiss
 	/* Check if all mission items are inside the geofence (if we have a valid geofence) */
 	if (geofence.valid()) {
 		for (size_t i = 0; i < nMissionItems; i++) {
-			static struct mission_item_s missionitem;
-			const ssize_t len = sizeof(struct mission_item_s);
+			struct mission_item_s missionitem;
+			const ssize_t len = sizeof(missionitem);
 
 			if (dm_read(dm_current, i, &missionitem, len) != len) {
 				/* not supposed to happen unless the datamanager can't access the SD card, etc. */
 				return false;
 			}
 
-			if (!geofence.inside(missionitem.lat, missionitem.lon, missionitem.altitude)) { //xxx: handle relative altitude
+			if (!geofence.inside(missionitem.lat, missionitem.lon, missionitem.altitude)) {
 				mavlink_log_info(_mavlink_fd, "#audio: Geofence violation waypoint %d", i);
 				return false;
 			}
@@ -118,6 +119,36 @@ bool MissionFeasibilityChecker::checkGeofence(dm_item_t dm_current, size_t nMiss
 	return true;
 }
 
+bool MissionFeasibilityChecker::checkHomePositionAltitude(dm_item_t dm_current, size_t nMissionItems, float home_alt, bool throw_error)
+{
+	/* Check if all all waypoints are above the home altitude, only return false if bool throw_error = true */
+	for (size_t i = 0; i < nMissionItems; i++) {
+		static struct mission_item_s missionitem;
+		const ssize_t len = sizeof(struct mission_item_s);
+
+		if (dm_read(dm_current, i, &missionitem, len) != len) {
+			/* not supposed to happen unless the datamanager can't access the SD card, etc. */
+			if (throw_error) {
+				return false;
+			} else	{
+				return true;
+			}
+		}
+
+		if (home_alt > missionitem.altitude) {
+			if (throw_error) {
+				mavlink_log_info(_mavlink_fd, "Waypoint %d below home", i);
+				return false;
+			} else	{
+				mavlink_log_info(_mavlink_fd, "#audio: warning waypoint %d below home", i);
+				return true;
+			}
+		}
+	}
+
+	return true;
+}
+
 bool MissionFeasibilityChecker::checkFixedWingLanding(dm_item_t dm_current, size_t nMissionItems)
 {
 	/* Go through all mission items and search for a landing waypoint
@@ -125,8 +156,8 @@ bool MissionFeasibilityChecker::checkFixedWingLanding(dm_item_t dm_current, size
 
 
 	for (size_t i = 0; i < nMissionItems; i++) {
-		static struct mission_item_s missionitem;
-		const ssize_t len = sizeof(struct mission_item_s);
+		struct mission_item_s missionitem;
+		const ssize_t len = sizeof(missionitem);
 		if (dm_read(dm_current, i, &missionitem, len) != len) {
 			/* not supposed to happen unless the datamanager can't access the SD card, etc. */
 			return false;
@@ -184,11 +215,12 @@ bool MissionFeasibilityChecker::checkFixedWingLanding(dm_item_t dm_current, size
 
 
 //	float slope_alt = wp_altitude + _H0 * expf(-math::max(0.0f, _flare_length - wp_distance)/_flare_constant) - _H1_virt;
+	return false;
 }
 
 void MissionFeasibilityChecker::updateNavigationCapabilities()
 {
-	int res = orb_copy(ORB_ID(navigation_capabilities), _capabilities_sub, &_nav_caps);
+	(void)orb_copy(ORB_ID(navigation_capabilities), _capabilities_sub, &_nav_caps);
 }
 
 void MissionFeasibilityChecker::init()
diff --git a/src/modules/navigator/mission_feasibility_checker.h b/src/modules/navigator/mission_feasibility_checker.h
index 7a0b2a296..96c9209d3 100644
--- a/src/modules/navigator/mission_feasibility_checker.h
+++ b/src/modules/navigator/mission_feasibility_checker.h
@@ -1,8 +1,6 @@
 /****************************************************************************
  *
  *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
- *   Author: @author Lorenz Meier <lm@inf.ethz.ch>
- *           @author Thomas Gubler <thomasgubler@student.ethz.ch>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -35,7 +33,11 @@
 /**
  * @file mission_feasibility_checker.h
  * Provides checks if mission is feasible given the navigation capabilities
+ *
+ * @author Lorenz Meier <lm@inf.ethz.ch>
+ * @author Thomas Gubler <thomasgubler@student.ethz.ch>
  */
+
 #ifndef MISSION_FEASIBILITY_CHECKER_H_
 #define MISSION_FEASIBILITY_CHECKER_H_
 
@@ -59,14 +61,15 @@ private:
 
 	/* Checks for all airframes */
 	bool checkGeofence(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence);
+	bool checkHomePositionAltitude(dm_item_t dm_current, size_t nMissionItems, float home_alt, bool throw_error = false);
 
 	/* Checks specific to fixedwing airframes */
-	bool checkMissionFeasibleFixedwing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence);
+	bool checkMissionFeasibleFixedwing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence, float home_alt);
 	bool checkFixedWingLanding(dm_item_t dm_current, size_t nMissionItems);
 	void updateNavigationCapabilities();
 
 	/* Checks specific to rotarywing airframes */
-	bool checkMissionFeasibleRotarywing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence);
+	bool checkMissionFeasibleRotarywing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence, float home_alt);
 public:
 
 	MissionFeasibilityChecker();
@@ -75,7 +78,7 @@ public:
 	/*
 	 * Returns true if mission is feasible and false otherwise
 	 */
-	bool checkMissionFeasible(bool isRotarywing, dm_item_t dm_current, size_t nMissionItems, Geofence &geofence);
+	bool checkMissionFeasible(bool isRotarywing, dm_item_t dm_current, size_t nMissionItems, Geofence &geofence, float home_alt);
 
 };
 
diff --git a/src/systemcmds/hw_ver/hw_ver.c b/src/modules/navigator/mission_params.c
index 4b84523cc..8692328db 100644
--- a/src/systemcmds/hw_ver/hw_ver.c
+++ b/src/modules/navigator/mission_params.c
@@ -32,42 +32,38 @@
  ****************************************************************************/
 
 /**
- * @file hw_ver.c
+ * @file mission_params.c
  *
- * Show and test hardware version.
+ * Parameters for mission.
+ *
+ * @author Julian Oes <joes@student.ethz.ch>
  */
 
 #include <nuttx/config.h>
 
-#include <stdio.h>
-#include <string.h>
-#include <errno.h>
-#include <version/version.h>
-
-__EXPORT int hw_ver_main(int argc, char *argv[]);
+#include <systemlib/param/param.h>
 
-int
-hw_ver_main(int argc, char *argv[])
-{
-	if (argc >= 2) {
-		if (!strcmp(argv[1], "show")) {
-			printf(HW_ARCH "\n");
-			exit(0);
-		}
+/*
+ * Mission parameters, accessible via MAVLink
+ */
 
-		if (!strcmp(argv[1], "compare")) {
-			if (argc >= 3) {
-				int ret = strcmp(HW_ARCH, argv[2]) != 0;
-				if (ret == 0) {
-					printf("hw_ver match: %s\n", HW_ARCH);
-				}
-				exit(ret);
+/**
+ * Take-off altitude
+ *
+ * Even if first waypoint has altitude less then MIS_TAKEOFF_ALT above home position, system will climb to
+ * MIS_TAKEOFF_ALT on takeoff, then go to waypoint.
+ *
+ * @unit meters
+ * @group Mission
+ */
+PARAM_DEFINE_FLOAT(MIS_TAKEOFF_ALT, 10.0f);
 
-			} else {
-				errx(1, "not enough arguments, try 'compare PX4FMU_1'");
-			}
-		}
-	}
 
-	errx(1, "expected a command, try 'show' or 'compare'");
-}
+/**
+ * Enable onboard mission
+ *
+ * @min 0
+ * @max 1
+ * @group Mission
+ */
+PARAM_DEFINE_INT32(MIS_ONBOARD_EN, 0);
diff --git a/src/modules/navigator/module.mk b/src/modules/navigator/module.mk
index 55f8a4caa..a1e109030 100644
--- a/src/modules/navigator/module.mk
+++ b/src/modules/navigator/module.mk
@@ -1,6 +1,6 @@
 ############################################################################
 #
-#   Copyright (c) 2013 PX4 Development Team. All rights reserved.
+#   Copyright (c) 2013-2014 PX4 Development Team. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
@@ -39,9 +39,17 @@ MODULE_COMMAND	= navigator
 
 SRCS		= navigator_main.cpp \
 		  navigator_params.c \
-		  navigator_mission.cpp \
+		  navigator_mode.cpp \
+		  mission_block.cpp \
+		  mission.cpp \
+		  mission_params.c \
+		  loiter.cpp \
+		  rtl.cpp \
+		  rtl_params.c \
 		  mission_feasibility_checker.cpp \
 		  geofence.cpp \
 		  geofence_params.c
 
 INCLUDE_DIRS	 += $(MAVLINK_SRC)/include/mavlink
+
+MODULE_STACKSIZE = 1200
diff --git a/src/modules/navigator/navigator.h b/src/modules/navigator/navigator.h
new file mode 100644
index 000000000..184ecd365
--- /dev/null
+++ b/src/modules/navigator/navigator.h
@@ -0,0 +1,219 @@
+/***************************************************************************
+ *
+ *   Copyright (c) 2013-2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+/**
+ * @file navigator.h
+ * Helper class to access missions
+ * @author Julian Oes <julian@oes.ch>
+ * @author Anton Babushkin <anton.babushkin@me.com>
+ */
+
+#ifndef NAVIGATOR_H
+#define NAVIGATOR_H
+
+#include <systemlib/perf_counter.h>
+
+#include <controllib/blocks.hpp>
+#include <controllib/block/BlockParam.hpp>
+
+#include <uORB/uORB.h>
+#include <uORB/topics/mission.h>
+#include <uORB/topics/vehicle_control_mode.h>
+#include <uORB/topics/position_setpoint_triplet.h>
+#include <uORB/topics/vehicle_global_position.h>
+#include <uORB/topics/parameter_update.h>
+
+#include "navigator_mode.h"
+#include "mission.h"
+#include "loiter.h"
+#include "rtl.h"
+#include "geofence.h"
+
+/**
+ * Number of navigation modes that need on_active/on_inactive calls
+ * Currently: mission, loiter, and rtl
+ */
+#define NAVIGATOR_MODE_ARRAY_SIZE 3
+
+class Navigator : public control::SuperBlock
+{
+public:
+	/**
+	 * Constructor
+	 */
+	Navigator();
+
+	/**
+	 * Destructor, also kills the navigators task.
+	 */
+	~Navigator();
+
+	/**
+	 * Start the navigator task.
+	 *
+	 * @return		OK on success.
+	 */
+	int		start();
+
+	/**
+	 * Display the navigator status.
+	 */
+	void		status();
+
+	/**
+	 * Add point to geofence
+	 */
+	void		add_fence_point(int argc, char *argv[]);
+
+	/**
+	 * Load fence from file
+	 */
+	void		load_fence_from_file(const char *filename);
+
+	/**
+	 * Setters
+	 */
+	void		set_can_loiter_at_sp(bool can_loiter) { _can_loiter_at_sp = can_loiter; }
+
+	/**
+	 * Getters
+	 */
+	struct vehicle_status_s*	    get_vstatus() { return &_vstatus; }
+	struct vehicle_global_position_s*   get_global_position() { return &_global_pos; }
+	struct home_position_s*		    get_home_position() { return &_home_pos; }
+	int		get_onboard_mission_sub() { return _onboard_mission_sub; }
+	int		get_offboard_mission_sub() { return _offboard_mission_sub; }
+	Geofence&	get_geofence() { return _geofence; }
+	bool		get_can_loiter_at_sp() { return _can_loiter_at_sp; }
+	float		get_loiter_radius() { return _param_loiter_radius.get(); }
+	float		get_acceptance_radius() { return _param_acceptance_radius.get(); }
+	int		get_mavlink_fd() { return _mavlink_fd; }
+
+private:
+
+	bool		_task_should_exit;		/**< if true, sensor task should exit */
+	int		_navigator_task;		/**< task handle for sensor task */
+
+	int		_mavlink_fd;			/**< the file descriptor to send messages over mavlink */
+
+	int		_global_pos_sub;		/**< global position subscription */
+	int		_home_pos_sub;			/**< home position subscription */
+	int		_vstatus_sub;			/**< vehicle status subscription */
+	int		_capabilities_sub;		/**< notification of vehicle capabilities updates */
+	int		_control_mode_sub;		/**< vehicle control mode subscription */
+	int		_onboard_mission_sub;		/**< onboard mission subscription */
+	int		_offboard_mission_sub;		/**< offboard mission subscription */
+	int		_param_update_sub;		/**< param update subscription */
+
+	orb_advert_t	_pos_sp_triplet_pub;		/**< publish position setpoint triplet */
+
+	vehicle_status_s				_vstatus;		/**< vehicle status */
+	vehicle_control_mode_s				_control_mode;		/**< vehicle control mode */
+	vehicle_global_position_s			_global_pos;		/**< global vehicle position */
+	home_position_s					_home_pos;		/**< home position for RTL */
+	mission_item_s 					_mission_item;		/**< current mission item */
+	navigation_capabilities_s			_nav_caps;		/**< navigation capabilities */
+	position_setpoint_triplet_s			_pos_sp_triplet;	/**< triplet of position setpoints */
+
+	bool 		_mission_item_valid;		/**< flags if the current mission item is valid */
+
+	perf_counter_t	_loop_perf;			/**< loop performance counter */
+
+	Geofence	_geofence;			/**< class that handles the geofence */
+	bool		_geofence_violation_warning_sent; /**< prevents spaming to mavlink */
+
+	bool		_fence_valid;			/**< flag if fence is valid */
+	bool		_inside_fence;			/**< vehicle is inside fence */
+
+	NavigatorMode	*_navigation_mode;		/**< abstract pointer to current navigation mode class */
+	Mission		_mission;			/**< class that handles the missions */
+	Loiter		_loiter;			/**< class that handles loiter */
+	RTL 		_rtl;				/**< class that handles RTL */
+
+	NavigatorMode *_navigation_mode_array[NAVIGATOR_MODE_ARRAY_SIZE];	/**< array of navigation modes */
+
+	bool		_can_loiter_at_sp;			/**< flags if current position SP can be used to loiter */
+	bool		_update_triplet;		/**< flags if position SP triplet needs to be published */
+
+	control::BlockParamFloat _param_loiter_radius;	/**< loiter radius for fixedwing */
+	control::BlockParamFloat _param_acceptance_radius;	/**< acceptance for takeoff */
+	/**
+	 * Retrieve global position
+	 */
+	void		global_position_update();
+
+	/**
+	 * Retrieve home position
+	 */
+	void		home_position_update();
+
+	/**
+	 * Retreive navigation capabilities
+	 */
+	void		navigation_capabilities_update();
+
+	/**
+	 * Retrieve vehicle status
+	 */
+	void		vehicle_status_update();
+
+	/**
+	 * Retrieve vehicle control mode
+	 */
+	void		vehicle_control_mode_update();
+
+	/**
+	 * Update parameters
+	 */
+	void		params_update();
+
+	/**
+	 * Shim for calling task_main from task_create.
+	 */
+	static void	task_main_trampoline(int argc, char *argv[]);
+
+	/**
+	 * Main task.
+	 */
+	void		task_main();
+
+	/**
+	 * Translate mission item to a position setpoint.
+	 */
+	void		mission_item_to_position_setpoint(const mission_item_s *item, position_setpoint_s *sp);
+
+	/**
+	 * Publish a new position setpoint triplet for position controllers
+	 */
+	void		publish_position_setpoint_triplet();
+};
+#endif
diff --git a/src/modules/navigator/navigator_main.cpp b/src/modules/navigator/navigator_main.cpp
index 5a94b6671..546602741 100644
--- a/src/modules/navigator/navigator_main.cpp
+++ b/src/modules/navigator/navigator_main.cpp
@@ -1,10 +1,6 @@
 /****************************************************************************
  *
  *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
- *   Author: @author Lorenz Meier <lm@inf.ethz.ch>
- *           @author Jean Cyr <jean.m.cyr@gmail.com>
- *           @author Julian Oes <joes@student.ethz.ch>
- *           @author Anton Babushkin <anton.babushkin@me.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -35,19 +31,19 @@
  *
  ****************************************************************************/
 /**
- * @file navigator_main.c
- * Implementation of the main navigation state machine.
+ * @file navigator_main.cpp
  *
- * Handles missions, geo fencing and failsafe navigation behavior.
- * Published the mission item triplet for the position controller.
+ * Handles mission items, geo fencing and failsafe navigation behavior.
+ * Published the position setpoint triplet for the position controller.
  *
  * @author Lorenz Meier <lm@inf.ethz.ch>
  * @author Jean Cyr <jean.m.cyr@gmail.com>
- * @author Julian Oes <joes@student.ethz.ch>
+ * @author Julian Oes <julian@oes.ch>
  * @author Anton Babushkin <anton.babushkin@me.com>
  */
 
 #include <nuttx/config.h>
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -58,42 +54,28 @@
 #include <poll.h>
 #include <time.h>
 #include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
 #include <drivers/device/device.h>
 #include <drivers/drv_hrt.h>
 #include <arch/board/board.h>
+
 #include <uORB/uORB.h>
-#include <uORB/topics/vehicle_global_position.h>
 #include <uORB/topics/home_position.h>
-#include <uORB/topics/position_setpoint_triplet.h>
 #include <uORB/topics/vehicle_status.h>
-#include <uORB/topics/vehicle_control_mode.h>
-#include <uORB/topics/parameter_update.h>
 #include <uORB/topics/mission.h>
 #include <uORB/topics/fence.h>
 #include <uORB/topics/navigation_capabilities.h>
-#include <systemlib/param/param.h>
+
 #include <systemlib/err.h>
-#include <systemlib/state_table.h>
-#include <systemlib/perf_counter.h>
 #include <systemlib/systemlib.h>
 #include <geo/geo.h>
-#include <mathlib/mathlib.h>
 #include <dataman/dataman.h>
+#include <mathlib/mathlib.h>
 #include <mavlink/mavlink_log.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-
-#include "navigator_state.h"
-#include "navigator_mission.h"
-#include "mission_feasibility_checker.h"
-#include "geofence.h"
-
 
-/* oddly, ERROR is not defined for c++ */
-#ifdef ERROR
-# undef ERROR
-#endif
-static const int ERROR = -1;
+#include "navigator.h"
 
 /**
  * navigator app start / stop handling function
@@ -102,342 +84,53 @@ static const int ERROR = -1;
  */
 extern "C" __EXPORT int navigator_main(int argc, char *argv[]);
 
-class Navigator : public StateTable
-{
-public:
-	/**
-	 * Constructor
-	 */
-	Navigator();
-
-	/**
-	 * Destructor, also kills the navigators task.
-	 */
-	~Navigator();
-
-	/**
-	* Start the navigator task.
-	 *
-	 * @return		OK on success.
-	 */
-	int		start();
-
-	/**
-	 * Display the navigator status.
-	 */
-	void		status();
-
-	/**
-	 * Add point to geofence
-	 */
-	void add_fence_point(int argc, char *argv[]);
-
-	/**
-	 * Load fence from file
-	 */
-	void load_fence_from_file(const char *filename);
-
-private:
-
-	bool		_task_should_exit;		/**< if true, sensor task should exit */
-	int		_navigator_task;		/**< task handle for sensor task */
-
-	int		_mavlink_fd;
-
-	int		_global_pos_sub;		/**< global position subscription */
-	int		_home_pos_sub;			/**< home position subscription */
-	int		_vstatus_sub;			/**< vehicle status subscription */
-	int		_params_sub;			/**< notification of parameter updates */
-	int		_offboard_mission_sub;		/**< notification of offboard mission updates */
-	int 		_onboard_mission_sub;		/**< notification of onboard mission updates */
-	int		_capabilities_sub;		/**< notification of vehicle capabilities updates */
-	int		_control_mode_sub;		/**< vehicle control mode subscription */
-
-	orb_advert_t	_pos_sp_triplet_pub;		/**< publish position setpoint triplet */
-	orb_advert_t	_mission_result_pub;		/**< publish mission result topic */
-
-	struct vehicle_status_s				_vstatus;		/**< vehicle status */
-	struct vehicle_control_mode_s			_control_mode;		/**< vehicle control mode */
-	struct vehicle_global_position_s		_global_pos;		/**< global vehicle position */
-	struct home_position_s				_home_pos;		/**< home position for RTL */
-	struct position_setpoint_triplet_s		_pos_sp_triplet;	/**< triplet of position setpoints */
-	struct mission_result_s				_mission_result;	/**< mission result for commander/mavlink */
-	struct mission_item_s				_mission_item;		/**< current mission item */
-
-	perf_counter_t	_loop_perf;			/**< loop performance counter */
-
-	Geofence					_geofence;
-	bool						_geofence_violation_warning_sent;
-
-	bool						_fence_valid;		/**< flag if fence is valid */
-	bool						_inside_fence;		/**< vehicle is inside fence */
-
-	struct navigation_capabilities_s		_nav_caps;
-
-	class 		Mission				_mission;
-
-	bool		_mission_item_valid;		/**< current mission item valid */
-	bool		_global_pos_valid;		/**< track changes of global_position.global_valid flag */
-	bool		_reset_loiter_pos;		/**< if true then loiter position should be set to current position */
-	bool		_waypoint_position_reached;
-	bool		_waypoint_yaw_reached;
-	uint64_t	_time_first_inside_orbit;
-	bool		_need_takeoff;			/**< if need to perform vertical takeoff before going to waypoint (only for MISSION mode and VTOL vehicles) */
-	bool		_do_takeoff;			/**< vertical takeoff state, current mission item is generated by navigator (only for MISSION mode and VTOL vehicles) */
-
-	MissionFeasibilityChecker missionFeasiblityChecker;
-
-	uint64_t	_set_nav_state_timestamp;	/**< timestamp of last handled navigation state request */
-
-	bool		_pos_sp_triplet_updated;
-
-	const char *nav_states_str[NAV_STATE_MAX];
-
-	struct {
-		float min_altitude;
-		float acceptance_radius;
-		float loiter_radius;
-		int onboard_mission_enabled;
-		float takeoff_alt;
-		float land_alt;
-		float rtl_alt;
-		float rtl_land_delay;
-	}		_parameters;			/**< local copies of parameters */
-
-	struct {
-		param_t min_altitude;
-		param_t acceptance_radius;
-		param_t loiter_radius;
-		param_t onboard_mission_enabled;
-		param_t takeoff_alt;
-		param_t land_alt;
-		param_t rtl_alt;
-		param_t rtl_land_delay;
-	}		_parameter_handles;		/**< handles for parameters */
-
-	enum Event {
-		EVENT_NONE_REQUESTED,
-		EVENT_READY_REQUESTED,
-		EVENT_LOITER_REQUESTED,
-		EVENT_MISSION_REQUESTED,
-		EVENT_RTL_REQUESTED,
-		EVENT_LAND_REQUESTED,
-		EVENT_MISSION_CHANGED,
-		EVENT_HOME_POSITION_CHANGED,
-		MAX_EVENT
-	};
-
-	/**
-	 * State machine transition table
-	 */
-	static StateTable::Tran const myTable[NAV_STATE_MAX][MAX_EVENT];
-
-	enum RTLState {
-		RTL_STATE_NONE = 0,
-		RTL_STATE_CLIMB,
-		RTL_STATE_RETURN,
-		RTL_STATE_DESCEND
-	};
-
-	enum RTLState _rtl_state;
-
-	/**
-	 * Update our local parameter cache.
-	 */
-	void		parameters_update();
-
-	/**
-	 * Retrieve global position
-	 */
-	void		global_position_update();
-
-	/**
-	 * Retrieve home position
-	 */
-	void		home_position_update();
-
-	/**
-	 * Retreive navigation capabilities
-	 */
-	void		navigation_capabilities_update();
-
-	/**
-	 * Retrieve offboard mission.
-	 */
-	void		offboard_mission_update(bool isrotaryWing);
-
-	/**
-	 * Retrieve onboard mission.
-	 */
-	void		onboard_mission_update();
-
-	/**
-	 * Retrieve vehicle status
-	 */
-	void		vehicle_status_update();
-
-	/**
-	 * Retrieve vehicle control mode
-	 */
-	void		vehicle_control_mode_update();
-
-	/**
-	 * Shim for calling task_main from task_create.
-	 */
-	static void	task_main_trampoline(int argc, char *argv[]);
-
-	/**
-	 * Main task.
-	 */
-	void		task_main();
-
-	void		publish_safepoints(unsigned points);
-
-	/**
-	 * Functions that are triggered when a new state is entered.
-	 */
-	void		start_none();
-	void		start_ready();
-	void		start_loiter();
-	void		start_mission();
-	void		start_rtl();
-	void		start_land();
-	void		start_land_home();
-
-	/**
-	 * Fork for state transitions
-	 */
-	void		request_loiter_or_ready();
-	void		request_mission_if_available();
-
-	/**
-	 * Guards offboard mission
-	 */
-	bool		offboard_mission_available(unsigned relative_index);
-
-	/**
-	 * Guards onboard mission
-	 */
-	bool		onboard_mission_available(unsigned relative_index);
-
-	/**
-	 * Reset all "reached" flags.
-	 */
-	void		reset_reached();
-
-	/**
-	 * Check if current mission item has been reached.
-	 */
-	bool		check_mission_item_reached();
-
-	/**
-	 * Perform actions when current mission item reached.
-	 */
-	void		on_mission_item_reached();
-
-	/**
-	 * Move to next waypoint
-	 */
-	void		set_mission_item();
-
-	/**
-	 * Switch to next RTL state
-	 */
-	void		set_rtl_item();
-
-	/**
-	 * Set position setpoint for mission item
-	 */
-	void		position_setpoint_from_mission_item(position_setpoint_s *sp, mission_item_s *item);
-
-	/**
-	 * Helper function to get a takeoff item
-	 */
-	void		get_takeoff_setpoint(position_setpoint_s *pos_sp);
-
-	/**
-	 * Publish a new mission item triplet for position controller
-	 */
-	void		publish_position_setpoint_triplet();
-};
 
 namespace navigator
 {
 
-/* oddly, ERROR is not defined for c++ */
-#ifdef ERROR
-# undef ERROR
-#endif
-static const int ERROR = -1;
-
 Navigator	*g_navigator;
 }
 
 Navigator::Navigator() :
-
-/* state machine transition table */
-	StateTable(&myTable[0][0], NAV_STATE_MAX, MAX_EVENT),
-
+	SuperBlock(NULL, "NAV"),
 	_task_should_exit(false),
 	_navigator_task(-1),
 	_mavlink_fd(-1),
-
-/* subscriptions */
 	_global_pos_sub(-1),
 	_home_pos_sub(-1),
 	_vstatus_sub(-1),
-	_params_sub(-1),
-	_offboard_mission_sub(-1),
-	_onboard_mission_sub(-1),
 	_capabilities_sub(-1),
 	_control_mode_sub(-1),
-
-/* publications */
+	_onboard_mission_sub(-1),
+	_offboard_mission_sub(-1),
 	_pos_sp_triplet_pub(-1),
-
-/* performance counters */
+	_vstatus({}),
+	_control_mode({}),
+	_global_pos({}),
+	_home_pos({}),
+	_mission_item({}),
+	_nav_caps({}),
+	_pos_sp_triplet({}),
+	_mission_item_valid(false),
 	_loop_perf(perf_alloc(PC_ELAPSED, "navigator")),
-
+	_geofence({}),
 	_geofence_violation_warning_sent(false),
 	_fence_valid(false),
 	_inside_fence(true),
-	_mission(),
-	_mission_item_valid(false),
-	_global_pos_valid(false),
-	_reset_loiter_pos(true),
-	_waypoint_position_reached(false),
-	_waypoint_yaw_reached(false),
-	_time_first_inside_orbit(0),
-	_need_takeoff(true),
-	_do_takeoff(false),
-	_set_nav_state_timestamp(0),
-	_pos_sp_triplet_updated(false),
-/* states */
-	_rtl_state(RTL_STATE_NONE)
+	_navigation_mode(nullptr),
+	_mission(this, "MIS"),
+	_loiter(this, "LOI"),
+	_rtl(this, "RTL"),
+	_update_triplet(false),
+	_param_loiter_radius(this, "LOITER_RAD"),
+	_param_acceptance_radius(this, "ACC_RAD")
 {
-	_parameter_handles.min_altitude = param_find("NAV_MIN_ALT");
-	_parameter_handles.acceptance_radius = param_find("NAV_ACCEPT_RAD");
-	_parameter_handles.loiter_radius = param_find("NAV_LOITER_RAD");
-	_parameter_handles.onboard_mission_enabled = param_find("NAV_ONB_MIS_EN");
-	_parameter_handles.takeoff_alt = param_find("NAV_TAKEOFF_ALT");
-	_parameter_handles.land_alt = param_find("NAV_LAND_ALT");
-	_parameter_handles.rtl_alt = param_find("NAV_RTL_ALT");
-	_parameter_handles.rtl_land_delay = param_find("NAV_RTL_LAND_T");
-
-	memset(&_pos_sp_triplet, 0, sizeof(struct position_setpoint_triplet_s));
-	memset(&_mission_item, 0, sizeof(struct mission_item_s));
-
-	memset(&nav_states_str, 0, sizeof(nav_states_str));
-	nav_states_str[0] = "NONE";
-	nav_states_str[1] = "READY";
-	nav_states_str[2] = "LOITER";
-	nav_states_str[3] = "MISSION";
-	nav_states_str[4] = "RTL";
-	nav_states_str[5] = "LAND";
-
-	/* Initialize state machine */
-	myState = NAV_STATE_NONE;
-	start_none();
+	/* Create a list of our possible navigation types */
+	_navigation_mode_array[0] = &_mission;
+	_navigation_mode_array[1] = &_loiter;
+	_navigation_mode_array[2] = &_rtl;
+
+	updateParams();
 }
 
 Navigator::~Navigator()
@@ -466,27 +159,6 @@ Navigator::~Navigator()
 }
 
 void
-Navigator::parameters_update()
-{
-	/* read from param to clear updated flag */
-	struct parameter_update_s update;
-	orb_copy(ORB_ID(parameter_update), _params_sub, &update);
-
-	param_get(_parameter_handles.min_altitude, &(_parameters.min_altitude));
-	param_get(_parameter_handles.acceptance_radius, &(_parameters.acceptance_radius));
-	param_get(_parameter_handles.loiter_radius, &(_parameters.loiter_radius));
-	param_get(_parameter_handles.onboard_mission_enabled, &(_parameters.onboard_mission_enabled));
-	param_get(_parameter_handles.takeoff_alt, &(_parameters.takeoff_alt));
-	param_get(_parameter_handles.land_alt, &(_parameters.land_alt));
-	param_get(_parameter_handles.rtl_alt, &(_parameters.rtl_alt));
-	param_get(_parameter_handles.rtl_land_delay, &(_parameters.rtl_land_delay));
-
-	_mission.set_onboard_mission_allowed((bool)_parameter_handles.onboard_mission_enabled);
-
-	_geofence.updateParams();
-}
-
-void
 Navigator::global_position_update()
 {
 	orb_copy(ORB_ID(vehicle_global_position), _global_pos_sub, &_global_pos);
@@ -504,56 +176,6 @@ Navigator::navigation_capabilities_update()
 	orb_copy(ORB_ID(navigation_capabilities), _capabilities_sub, &_nav_caps);
 }
 
-
-void
-Navigator::offboard_mission_update(bool isrotaryWing)
-{
-	struct mission_s offboard_mission;
-
-	if (orb_copy(ORB_ID(mission), _offboard_mission_sub, &offboard_mission) == OK) {
-
-		/* Check mission feasibility, for now do not handle the return value,
-		 * however warnings are issued to the gcs via mavlink from inside the MissionFeasiblityChecker */
-		dm_item_t dm_current;
-
-		if (offboard_mission.dataman_id == 0) {
-			dm_current = DM_KEY_WAYPOINTS_OFFBOARD_0;
-
-		} else {
-			dm_current = DM_KEY_WAYPOINTS_OFFBOARD_1;
-		}
-
-		missionFeasiblityChecker.checkMissionFeasible(isrotaryWing, dm_current, (size_t)offboard_mission.count, _geofence);
-
-		_mission.set_offboard_dataman_id(offboard_mission.dataman_id);
-
-		_mission.set_offboard_mission_count(offboard_mission.count);
-		_mission.set_current_offboard_mission_index(offboard_mission.current_index);
-
-	} else {
-		_mission.set_offboard_mission_count(0);
-		_mission.set_current_offboard_mission_index(0);
-	}
-
-	_mission.publish_mission_result();
-}
-
-void
-Navigator::onboard_mission_update()
-{
-	struct mission_s onboard_mission;
-
-	if (orb_copy(ORB_ID(mission), _onboard_mission_sub, &onboard_mission) == OK) {
-
-		_mission.set_onboard_mission_count(onboard_mission.count);
-		_mission.set_current_onboard_mission_index(onboard_mission.current_index);
-
-	} else {
-		_mission.set_onboard_mission_count(0);
-		_mission.set_current_onboard_mission_index(0);
-	}
-}
-
 void
 Navigator::vehicle_status_update()
 {
@@ -574,6 +196,13 @@ Navigator::vehicle_control_mode_update()
 }
 
 void
+Navigator::params_update()
+{
+	parameter_update_s param_update;
+	orb_copy(ORB_ID(parameter_update), _param_update_sub, &param_update);
+}
+
+void
 Navigator::task_main_trampoline(int argc, char *argv[])
 {
 	navigator::g_navigator->task_main();
@@ -584,16 +213,12 @@ Navigator::task_main()
 {
 	/* inform about start */
 	warnx("Initializing..");
-	fflush(stdout);
 
 	_mavlink_fd = open(MAVLINK_LOG_DEVICE, 0);
 
-	mavlink_log_info(_mavlink_fd, "[navigator] started");
-
 	/* Try to load the geofence:
 	 * if /fs/microsd/etc/geofence.txt load from this file
-	 * else clear geofence data in datamanager
-	 */
+	 * else clear geofence data in datamanager */
 	struct stat buffer;
 
 	if (stat(GEOFENCE_FILENAME, &buffer) == 0) {
@@ -607,68 +232,58 @@ Navigator::task_main()
 			warnx("Could not clear geofence");
 	}
 
-	/*
-	 * do subscriptions
-	 */
+	/* do subscriptions */
 	_global_pos_sub = orb_subscribe(ORB_ID(vehicle_global_position));
-	_offboard_mission_sub = orb_subscribe(ORB_ID(mission));
-	_onboard_mission_sub = orb_subscribe(ORB_ID(onboard_mission));
 	_capabilities_sub = orb_subscribe(ORB_ID(navigation_capabilities));
 	_vstatus_sub = orb_subscribe(ORB_ID(vehicle_status));
 	_control_mode_sub = orb_subscribe(ORB_ID(vehicle_control_mode));
-	_params_sub = orb_subscribe(ORB_ID(parameter_update));
 	_home_pos_sub = orb_subscribe(ORB_ID(home_position));
+	_onboard_mission_sub = orb_subscribe(ORB_ID(onboard_mission));
+	_offboard_mission_sub = orb_subscribe(ORB_ID(offboard_mission));
+	_param_update_sub = orb_subscribe(ORB_ID(parameter_update));
 
 	/* copy all topics first time */
 	vehicle_status_update();
 	vehicle_control_mode_update();
-	parameters_update();
 	global_position_update();
 	home_position_update();
 	navigation_capabilities_update();
-	offboard_mission_update(_vstatus.is_rotary_wing);
-	onboard_mission_update();
+	params_update();
 
 	/* rate limit position updates to 50 Hz */
 	orb_set_interval(_global_pos_sub, 20);
 
-	unsigned prevState = NAV_STATE_NONE;
 	hrt_abstime mavlink_open_time = 0;
 	const hrt_abstime mavlink_open_interval = 500000;
 
 	/* wakeup source(s) */
-	struct pollfd fds[8];
+	struct pollfd fds[6];
 
 	/* Setup of loop */
-	fds[0].fd = _params_sub;
+	fds[0].fd = _global_pos_sub;
 	fds[0].events = POLLIN;
-	fds[1].fd = _global_pos_sub;
+	fds[1].fd = _home_pos_sub;
 	fds[1].events = POLLIN;
-	fds[2].fd = _home_pos_sub;
+	fds[2].fd = _capabilities_sub;
 	fds[2].events = POLLIN;
-	fds[3].fd = _capabilities_sub;
+	fds[3].fd = _vstatus_sub;
 	fds[3].events = POLLIN;
-	fds[4].fd = _offboard_mission_sub;
+	fds[4].fd = _control_mode_sub;
 	fds[4].events = POLLIN;
-	fds[5].fd = _onboard_mission_sub;
+	fds[5].fd = _param_update_sub;
 	fds[5].events = POLLIN;
-	fds[6].fd = _vstatus_sub;
-	fds[6].events = POLLIN;
-	fds[7].fd = _control_mode_sub;
-	fds[7].events = POLLIN;
 
 	while (!_task_should_exit) {
 
 		/* wait for up to 100ms for data */
 		int pret = poll(&fds[0], (sizeof(fds) / sizeof(fds[0])), 100);
 
-		/* timed out - periodic check for _task_should_exit, etc. */
 		if (pret == 0) {
+			/* timed out - periodic check for _task_should_exit, etc. */
 			continue;
-		}
 
-		/* this is undesirable but not much we can do - might want to flag unhappy status */
-		if (pret < 0) {
+		} else if (pret < 0) {
+			/* this is undesirable but not much we can do - might want to flag unhappy status */
 			warn("poll error %d, %d", pret, errno);
 			continue;
 		}
@@ -681,188 +296,103 @@ Navigator::task_main()
 			_mavlink_fd = open(MAVLINK_LOG_DEVICE, 0);
 		}
 
+		/* parameters updated */
+		if (fds[5].revents & POLLIN) {
+			params_update();
+			updateParams();
+		}
+
 		/* vehicle control mode updated */
-		if (fds[7].revents & POLLIN) {
+		if (fds[4].revents & POLLIN) {
 			vehicle_control_mode_update();
 		}
 
 		/* vehicle status updated */
-		if (fds[6].revents & POLLIN) {
+		if (fds[3].revents & POLLIN) {
 			vehicle_status_update();
-
-			/* evaluate state machine from commander and set the navigator mode accordingly */
-			if (_control_mode.flag_armed && _control_mode.flag_control_auto_enabled) {
-				bool stick_mode = false;
-
-				if (!_vstatus.rc_signal_lost) {
-					/* RC signal available, use control switches to set mode */
-					/* RETURN switch, overrides MISSION switch */
-					if (_vstatus.return_switch == RETURN_SWITCH_RETURN) {
-						/* switch to RTL if not already landed after RTL and home position set */
-						if (!(_rtl_state == RTL_STATE_DESCEND &&
-						      (myState == NAV_STATE_LAND || myState == NAV_STATE_LOITER)) &&
-						    _vstatus.condition_home_position_valid) {
-							dispatch(EVENT_RTL_REQUESTED);
-						}
-
-						stick_mode = true;
-
-					} else {
-						/* MISSION switch */
-						if (_vstatus.mission_switch == MISSION_SWITCH_LOITER) {
-							request_loiter_or_ready();
-							stick_mode = true;
-
-						} else if (_vstatus.mission_switch == MISSION_SWITCH_MISSION) {
-							request_mission_if_available();
-							stick_mode = true;
-						}
-
-						if (!stick_mode && _vstatus.return_switch == RETURN_SWITCH_NORMAL && myState == NAV_STATE_RTL) {
-							/* RETURN switch is in normal mode, no MISSION switch mapped, interrupt if in RTL state */
-							request_mission_if_available();
-							stick_mode = true;
-						}
-					}
-				}
-
-				if (!stick_mode) {
-					if (_vstatus.set_nav_state_timestamp != _set_nav_state_timestamp) {
-						/* commander requested new navigation mode, try to set it */
-						_set_nav_state_timestamp = _vstatus.set_nav_state_timestamp;
-
-						switch (_vstatus.set_nav_state) {
-						case NAV_STATE_NONE:
-							/* nothing to do */
-							break;
-
-						case NAV_STATE_LOITER:
-							request_loiter_or_ready();
-							break;
-
-						case NAV_STATE_MISSION:
-							request_mission_if_available();
-							break;
-
-						case NAV_STATE_RTL:
-							if (!(_rtl_state == RTL_STATE_DESCEND &&
-							      (myState == NAV_STATE_LAND || myState == NAV_STATE_LOITER)) &&
-							    _vstatus.condition_home_position_valid) {
-								dispatch(EVENT_RTL_REQUESTED);
-							}
-
-							break;
-
-						case NAV_STATE_LAND:
-							dispatch(EVENT_LAND_REQUESTED);
-
-							break;
-
-						default:
-							warnx("ERROR: Requested navigation state not supported");
-							break;
-						}
-
-					} else {
-						/* on first switch to AUTO try mission by default, if none is available fallback to loiter */
-						if (myState == NAV_STATE_NONE) {
-							request_mission_if_available();
-						}
-					}
-				}
-
-			} else {
-				/* navigator shouldn't act */
-				dispatch(EVENT_NONE_REQUESTED);
-			}
-		}
-
-		/* parameters updated */
-		if (fds[0].revents & POLLIN) {
-			parameters_update();
-			/* note that these new parameters won't be in effect until a mission triplet is published again */
 		}
 
 		/* navigation capabilities updated */
-		if (fds[3].revents & POLLIN) {
+		if (fds[2].revents & POLLIN) {
 			navigation_capabilities_update();
 		}
 
-		/* offboard mission updated */
-		if (fds[4].revents & POLLIN) {
-			offboard_mission_update(_vstatus.is_rotary_wing);
-			// XXX check if mission really changed
-			dispatch(EVENT_MISSION_CHANGED);
-		}
-
-		/* onboard mission updated */
-		if (fds[5].revents & POLLIN) {
-			onboard_mission_update();
-			// XXX check if mission really changed
-			dispatch(EVENT_MISSION_CHANGED);
-		}
-
 		/* home position updated */
-		if (fds[2].revents & POLLIN) {
+		if (fds[1].revents & POLLIN) {
 			home_position_update();
-			// XXX check if home position really changed
-			dispatch(EVENT_HOME_POSITION_CHANGED);
 		}
 
 		/* global position updated */
-		if (fds[1].revents & POLLIN) {
+		if (fds[0].revents & POLLIN) {
 			global_position_update();
 
-			/* publish position setpoint triplet on each position update if navigator active */
-			if (_control_mode.flag_armed && _control_mode.flag_control_auto_enabled) {
-				_pos_sp_triplet_updated = true;
-
-				if (myState == NAV_STATE_LAND && _global_pos.global_valid && !_global_pos_valid) {
-					/* got global position when landing, update setpoint */
-					start_land();
-				}
-
-				_global_pos_valid = _global_pos.global_valid;
-
-				/* check if waypoint has been reached in MISSION, RTL and LAND modes */
-				if (myState == NAV_STATE_MISSION || myState == NAV_STATE_RTL || myState == NAV_STATE_LAND) {
-					if (check_mission_item_reached()) {
-						on_mission_item_reached();
-					}
-				}
-			}
-
 			/* Check geofence violation */
 			if (!_geofence.inside(&_global_pos)) {
-				//xxx: publish geofence violation here (or change local flag depending on which app handles the flight termination)
 
 				/* Issue a warning about the geofence violation once */
 				if (!_geofence_violation_warning_sent) {
 					mavlink_log_critical(_mavlink_fd, "#audio: Geofence violation");
 					_geofence_violation_warning_sent = true;
 				}
-
 			} else {
 				/* Reset the _geofence_violation_warning_sent field */
 				_geofence_violation_warning_sent = false;
 			}
 		}
 
-		/* publish position setpoint triplet if updated */
-		if (_pos_sp_triplet_updated) {
-			_pos_sp_triplet_updated = false;
-			publish_position_setpoint_triplet();
+		/* Do stuff according to navigation state set by commander */
+		switch (_vstatus.nav_state) {
+			case NAVIGATION_STATE_MANUAL:
+			case NAVIGATION_STATE_ACRO:
+			case NAVIGATION_STATE_ALTCTL:
+			case NAVIGATION_STATE_POSCTL:
+				_navigation_mode = nullptr;
+				_can_loiter_at_sp = false;
+				break;
+			case NAVIGATION_STATE_AUTO_MISSION:
+				_navigation_mode = &_mission;
+				break;
+			case NAVIGATION_STATE_AUTO_LOITER:
+				_navigation_mode = &_loiter;
+				break;
+			case NAVIGATION_STATE_AUTO_RTL:
+				_navigation_mode = &_rtl;
+				break;
+			case NAVIGATION_STATE_AUTO_RTGS:
+				_navigation_mode = &_rtl; /* TODO: change this to something else */
+				break;
+			case NAVIGATION_STATE_LAND:
+			case NAVIGATION_STATE_TERMINATION:
+			default:
+				_navigation_mode = nullptr;
+				_can_loiter_at_sp = false;
+				break;
 		}
 
-		/* notify user about state changes */
-		if (myState != prevState) {
-			mavlink_log_info(_mavlink_fd, "#audio: navigation state: %s", nav_states_str[myState]);
-			prevState = myState;
+		/* iterate through navigation modes and set active/inactive for each */
+		for(unsigned int i = 0; i < NAVIGATOR_MODE_ARRAY_SIZE; i++) {
+			if (_navigation_mode == _navigation_mode_array[i]) {
+				_update_triplet = _navigation_mode_array[i]->on_active(&_pos_sp_triplet);
+			} else {
+				_navigation_mode_array[i]->on_inactive();
+			}
+		}
+
+		/* if nothing is running, set position setpoint triplet invalid */
+		if (_navigation_mode == nullptr) {
+			_pos_sp_triplet.previous.valid = false;
+			_pos_sp_triplet.current.valid = false;
+			_pos_sp_triplet.next.valid = false;
+			_update_triplet = true;
+		}
+
+		if (_update_triplet) {
+			publish_position_setpoint_triplet();
+			_update_triplet = false;
 		}
 
 		perf_end(_loop_perf);
 	}
-
 	warnx("exiting.");
 
 	_navigator_task = -1;
@@ -878,7 +408,7 @@ Navigator::start()
 	_navigator_task = task_spawn_cmd("navigator",
 					 SCHED_DEFAULT,
 					 SCHED_PRIORITY_MAX - 5,
-					 2048,
+					 2000,
 					 (main_t)&Navigator::task_main_trampoline,
 					 nullptr);
 
@@ -893,19 +423,21 @@ Navigator::start()
 void
 Navigator::status()
 {
-	warnx("Global position is %svalid", _global_pos.global_valid ? "" : "in");
-
-	if (_global_pos.global_valid) {
-		warnx("Longitude %5.5f degrees, latitude %5.5f degrees", _global_pos.lon, _global_pos.lat);
-		warnx("Altitude %5.5f meters, altitude above home %5.5f meters",
-		      (double)_global_pos.alt, (double)(_global_pos.alt - _home_pos.alt));
-		warnx("Ground velocity in m/s, N %5.5f, E %5.5f, D %5.5f",
-		      (double)_global_pos.vel_n, (double)_global_pos.vel_e, (double)_global_pos.vel_d);
-		warnx("Compass heading in degrees %5.5f", (double)(_global_pos.yaw * M_RAD_TO_DEG_F));
-	}
+	/* TODO: add this again */
+	// warnx("Global position is %svalid", _global_pos_valid ? "" : "in");
+
+	// if (_global_pos.global_valid) {
+	// 	warnx("Longitude %5.5f degrees, latitude %5.5f degrees", _global_pos.lon, _global_pos.lat);
+	// 	warnx("Altitude %5.5f meters, altitude above home %5.5f meters",
+	// 	      (double)_global_pos.alt, (double)(_global_pos.alt - _home_pos.alt));
+	// 	warnx("Ground velocity in m/s, N %5.5f, E %5.5f, D %5.5f",
+	// 	      (double)_global_pos.vel_n, (double)_global_pos.vel_e, (double)_global_pos.vel_d);
+	// 	warnx("Compass heading in degrees %5.5f", (double)(_global_pos.yaw * M_RAD_TO_DEG_F));
+	// }
 
 	if (_fence_valid) {
 		warnx("Geofence is valid");
+		/* TODO: needed? */
 //		warnx("Vertex longitude latitude");
 //		for (unsigned i = 0; i < _fence.count; i++)
 //		warnx("%6u %9.5f %8.5f", i, (double)_fence.vertices[i].lon, (double)_fence.vertices[i].lat);
@@ -913,741 +445,19 @@ Navigator::status()
 	} else {
 		warnx("Geofence not set");
 	}
-
-	switch (myState) {
-	case NAV_STATE_NONE:
-		warnx("State: None");
-		break;
-
-	case NAV_STATE_LOITER:
-		warnx("State: Loiter");
-		break;
-
-	case NAV_STATE_MISSION:
-		warnx("State: Mission");
-		break;
-
-	case NAV_STATE_RTL:
-		warnx("State: RTL");
-		break;
-
-	default:
-		warnx("State: Unknown");
-		break;
-	}
-}
-
-StateTable::Tran const Navigator::myTable[NAV_STATE_MAX][MAX_EVENT] = {
-	{
-		/* NAV_STATE_NONE */
-		/* EVENT_NONE_REQUESTED */		{NO_ACTION, NAV_STATE_NONE},
-		/* EVENT_READY_REQUESTED */		{ACTION(&Navigator::start_ready), NAV_STATE_READY},
-		/* EVENT_LOITER_REQUESTED */		{ACTION(&Navigator::start_loiter), NAV_STATE_LOITER},
-		/* EVENT_MISSION_REQUESTED */		{ACTION(&Navigator::start_mission), NAV_STATE_MISSION},
-		/* EVENT_RTL_REQUESTED */		{ACTION(&Navigator::start_rtl), NAV_STATE_RTL},
-		/* EVENT_LAND_REQUESTED */		{ACTION(&Navigator::start_land), NAV_STATE_LAND},
-		/* EVENT_MISSION_CHANGED */		{NO_ACTION, NAV_STATE_NONE},
-		/* EVENT_HOME_POSITION_CHANGED */	{NO_ACTION, NAV_STATE_NONE},
-	},
-	{
-		/* NAV_STATE_READY */
-		/* EVENT_NONE_REQUESTED */		{ACTION(&Navigator::start_none), NAV_STATE_NONE},
-		/* EVENT_READY_REQUESTED */		{NO_ACTION, NAV_STATE_READY},
-		/* EVENT_LOITER_REQUESTED */		{NO_ACTION, NAV_STATE_READY},
-		/* EVENT_MISSION_REQUESTED */		{ACTION(&Navigator::start_mission), NAV_STATE_MISSION},
-		/* EVENT_RTL_REQUESTED */		{NO_ACTION, NAV_STATE_READY},
-		/* EVENT_LAND_REQUESTED */		{NO_ACTION, NAV_STATE_READY},
-		/* EVENT_MISSION_CHANGED */		{NO_ACTION, NAV_STATE_READY},
-		/* EVENT_HOME_POSITION_CHANGED */	{NO_ACTION, NAV_STATE_READY},
-	},
-	{
-		/* NAV_STATE_LOITER */
-		/* EVENT_NONE_REQUESTED */		{ACTION(&Navigator::start_none), NAV_STATE_NONE},
-		/* EVENT_READY_REQUESTED */		{NO_ACTION, NAV_STATE_LOITER},
-		/* EVENT_LOITER_REQUESTED */		{NO_ACTION, NAV_STATE_LOITER},
-		/* EVENT_MISSION_REQUESTED */		{ACTION(&Navigator::start_mission), NAV_STATE_MISSION},
-		/* EVENT_RTL_REQUESTED */		{ACTION(&Navigator::start_rtl), NAV_STATE_RTL},
-		/* EVENT_LAND_REQUESTED */		{ACTION(&Navigator::start_land), NAV_STATE_LAND},
-		/* EVENT_MISSION_CHANGED */		{NO_ACTION, NAV_STATE_LOITER},
-		/* EVENT_HOME_POSITION_CHANGED */	{NO_ACTION, NAV_STATE_LOITER},
-	},
-	{
-		/* NAV_STATE_MISSION */
-		/* EVENT_NONE_REQUESTED */		{ACTION(&Navigator::start_none), NAV_STATE_NONE},
-		/* EVENT_READY_REQUESTED */		{ACTION(&Navigator::start_ready), NAV_STATE_READY},
-		/* EVENT_LOITER_REQUESTED */		{ACTION(&Navigator::start_loiter), NAV_STATE_LOITER},
-		/* EVENT_MISSION_REQUESTED */		{NO_ACTION, NAV_STATE_MISSION},
-		/* EVENT_RTL_REQUESTED */		{ACTION(&Navigator::start_rtl), NAV_STATE_RTL},
-		/* EVENT_LAND_REQUESTED */		{ACTION(&Navigator::start_land), NAV_STATE_LAND},
-		/* EVENT_MISSION_CHANGED */		{ACTION(&Navigator::start_mission), NAV_STATE_MISSION},
-		/* EVENT_HOME_POSITION_CHANGED */	{NO_ACTION, NAV_STATE_MISSION},
-	},
-	{
-		/* NAV_STATE_RTL */
-		/* EVENT_NONE_REQUESTED */		{ACTION(&Navigator::start_none), NAV_STATE_NONE},
-		/* EVENT_READY_REQUESTED */		{ACTION(&Navigator::start_ready), NAV_STATE_READY},
-		/* EVENT_LOITER_REQUESTED */		{ACTION(&Navigator::start_loiter), NAV_STATE_LOITER},
-		/* EVENT_MISSION_REQUESTED */		{ACTION(&Navigator::start_mission), NAV_STATE_MISSION},
-		/* EVENT_RTL_REQUESTED */		{NO_ACTION, NAV_STATE_RTL},
-		/* EVENT_LAND_REQUESTED */		{ACTION(&Navigator::start_land_home), NAV_STATE_LAND},
-		/* EVENT_MISSION_CHANGED */		{NO_ACTION, NAV_STATE_RTL},
-		/* EVENT_HOME_POSITION_CHANGED */	{ACTION(&Navigator::start_rtl), NAV_STATE_RTL},	// TODO need to reset rtl_state
-	},
-	{
-		/* NAV_STATE_LAND */
-		/* EVENT_NONE_REQUESTED */		{ACTION(&Navigator::start_none), NAV_STATE_NONE},
-		/* EVENT_READY_REQUESTED */		{ACTION(&Navigator::start_ready), NAV_STATE_READY},
-		/* EVENT_LOITER_REQUESTED */		{ACTION(&Navigator::start_loiter), NAV_STATE_LOITER},
-		/* EVENT_MISSION_REQUESTED */		{ACTION(&Navigator::start_mission), NAV_STATE_MISSION},
-		/* EVENT_RTL_REQUESTED */		{ACTION(&Navigator::start_rtl), NAV_STATE_RTL},
-		/* EVENT_LAND_REQUESTED */		{NO_ACTION, NAV_STATE_LAND},
-		/* EVENT_MISSION_CHANGED */		{NO_ACTION, NAV_STATE_LAND},
-		/* EVENT_HOME_POSITION_CHANGED */	{NO_ACTION, NAV_STATE_LAND},
-	},
-};
-
-void
-Navigator::start_none()
-{
-	reset_reached();
-
-	_pos_sp_triplet.previous.valid = false;
-	_pos_sp_triplet.current.valid = false;
-	_pos_sp_triplet.next.valid = false;
-	_mission_item_valid = false;
-
-	_reset_loiter_pos = true;
-	_do_takeoff = false;
-	_rtl_state = RTL_STATE_NONE;
-
-	_pos_sp_triplet_updated = true;
-}
-
-void
-Navigator::start_ready()
-{
-	reset_reached();
-
-	_pos_sp_triplet.previous.valid = false;
-	_pos_sp_triplet.current.valid = true;
-	_pos_sp_triplet.next.valid = false;
-
-	_pos_sp_triplet.current.type = SETPOINT_TYPE_IDLE;
-
-	_mission_item_valid = false;
-
-	_reset_loiter_pos = true;
-	_do_takeoff = false;
-
-	if (_rtl_state != RTL_STATE_DESCEND) {
-		/* reset RTL state if landed not at home */
-		_rtl_state = RTL_STATE_NONE;
-	}
-
-	_pos_sp_triplet_updated = true;
-}
-
-void
-Navigator::start_loiter()
-{
-	reset_reached();
-
-	_do_takeoff = false;
-
-	/* set loiter position if needed */
-	if (_reset_loiter_pos || !_pos_sp_triplet.current.valid) {
-		_reset_loiter_pos = false;
-
-		_pos_sp_triplet.current.lat = _global_pos.lat;
-		_pos_sp_triplet.current.lon = _global_pos.lon;
-		_pos_sp_triplet.current.yaw = NAN;	// NAN means to use current yaw
-
-		float min_alt_amsl = _parameters.min_altitude + _home_pos.alt;
-
-		/* use current altitude if above min altitude set by parameter */
-		if (_global_pos.alt < min_alt_amsl && !_vstatus.is_rotary_wing) {
-			_pos_sp_triplet.current.alt = min_alt_amsl;
-			mavlink_log_info(_mavlink_fd, "#audio: loiter %.1fm higher", (double)(min_alt_amsl - _global_pos.alt));
-
-		} else {
-			_pos_sp_triplet.current.alt = _global_pos.alt;
-			mavlink_log_info(_mavlink_fd, "#audio: loiter at current altitude");
-		}
-
-	}
-	_pos_sp_triplet.current.type = SETPOINT_TYPE_LOITER;
-	_pos_sp_triplet.current.loiter_radius = _parameters.loiter_radius;
-	_pos_sp_triplet.current.loiter_direction = 1;
-	_pos_sp_triplet.previous.valid = false;
-	_pos_sp_triplet.current.valid = true;
-	_pos_sp_triplet.next.valid = false;
-	_mission_item_valid = false;
-
-	_pos_sp_triplet_updated = true;
-}
-
-void
-Navigator::start_mission()
-{
-	_need_takeoff = true;
-
-	set_mission_item();
-}
-
-void
-Navigator::set_mission_item()
-{
-	reset_reached();
-
-	/* copy current mission to previous item */
-	memcpy(&_pos_sp_triplet.previous, &_pos_sp_triplet.current, sizeof(position_setpoint_s));
-
-	_reset_loiter_pos = true;
-	_do_takeoff = false;
-
-	int ret;
-	bool onboard;
-	unsigned index;
-
-	ret = _mission.get_current_mission_item(&_mission_item, &onboard, &index);
-
-	if (ret == OK) {
-		_mission.report_current_offboard_mission_item();
-
-		_mission_item_valid = true;
-		position_setpoint_from_mission_item(&_pos_sp_triplet.current, &_mission_item);
-
-		if (_mission_item.nav_cmd != NAV_CMD_RETURN_TO_LAUNCH &&
-		    _mission_item.nav_cmd != NAV_CMD_LOITER_TIME_LIMIT &&
-		    _mission_item.nav_cmd != NAV_CMD_LOITER_TURN_COUNT &&
-		    _mission_item.nav_cmd != NAV_CMD_LOITER_UNLIMITED) {
-			/* don't reset RTL state on RTL or LOITER items */
-			_rtl_state = RTL_STATE_NONE;
-		}
-
-		if (_vstatus.is_rotary_wing) {
-			if (_need_takeoff && (
-				    _mission_item.nav_cmd == NAV_CMD_TAKEOFF ||
-				    _mission_item.nav_cmd == NAV_CMD_WAYPOINT ||
-				    _mission_item.nav_cmd == NAV_CMD_RETURN_TO_LAUNCH ||
-				    _mission_item.nav_cmd == NAV_CMD_LOITER_TIME_LIMIT ||
-				    _mission_item.nav_cmd == NAV_CMD_LOITER_TURN_COUNT ||
-				    _mission_item.nav_cmd == NAV_CMD_LOITER_UNLIMITED
-			    )) {
-				/* do special TAKEOFF handling for VTOL */
-				_need_takeoff = false;
-
-				/* calculate desired takeoff altitude AMSL */
-				float takeoff_alt_amsl = _pos_sp_triplet.current.alt;
-
-				if (_vstatus.condition_landed) {
-					/* takeoff to at least NAV_TAKEOFF_ALT from ground if landed */
-					takeoff_alt_amsl = fmaxf(takeoff_alt_amsl, _global_pos.alt + _parameters.takeoff_alt);
-				}
-
-				/* check if we really need takeoff */
-				if (_vstatus.condition_landed || _global_pos.alt < takeoff_alt_amsl - _mission_item.acceptance_radius) {
-					/* force TAKEOFF if landed or waypoint altitude is more than current */
-					_do_takeoff = true;
-
-					/* move current position setpoint to next */
-					memcpy(&_pos_sp_triplet.next, &_pos_sp_triplet.current, sizeof(position_setpoint_s));
-
-					/* set current setpoint to takeoff */
-
-					_pos_sp_triplet.current.lat = _global_pos.lat;
-					_pos_sp_triplet.current.lon = _global_pos.lon;
-					_pos_sp_triplet.current.alt = takeoff_alt_amsl;
-					_pos_sp_triplet.current.yaw = NAN;
-					_pos_sp_triplet.current.type = SETPOINT_TYPE_TAKEOFF;
-				}
-
-			} else if (_mission_item.nav_cmd == NAV_CMD_LAND) {
-				/* will need takeoff after landing */
-				_need_takeoff = true;
-			}
-		}
-
-		if (_do_takeoff) {
-			mavlink_log_info(_mavlink_fd, "#audio: takeoff to %.1fm above home", (double)(_pos_sp_triplet.current.alt - _home_pos.alt));
-
-		} else {
-			if (onboard) {
-				mavlink_log_info(_mavlink_fd, "#audio: heading to onboard WP %d", index);
-
-			} else {
-				mavlink_log_info(_mavlink_fd, "#audio: heading to offboard WP %d", index);
-			}
-		}
-
-	} else {
-		/* since a mission is not advanced without WPs available, this is not supposed to happen */
-		_mission_item_valid = false;
-		_pos_sp_triplet.current.valid = false;
-		warnx("ERROR: current WP can't be set");
-	}
-
-	if (!_do_takeoff) {
-		mission_item_s item_next;
-		ret = _mission.get_next_mission_item(&item_next);
-
-		if (ret == OK) {
-			position_setpoint_from_mission_item(&_pos_sp_triplet.next, &item_next);
-
-		} else {
-			/* this will fail for the last WP */
-			_pos_sp_triplet.next.valid = false;
-		}
-	}
-
-	_pos_sp_triplet_updated = true;
-}
-
-void
-Navigator::start_rtl()
-{
-	_do_takeoff = false;
-
-	/* decide if we need climb */
-	if (_rtl_state == RTL_STATE_NONE) {
-		if (_global_pos.alt < _home_pos.alt + _parameters.rtl_alt) {
-			_rtl_state = RTL_STATE_CLIMB;
-
-		} else {
-			_rtl_state = RTL_STATE_RETURN;
-		}
-	}
-
-	/* if switching directly to return state, reset altitude setpoint */
-	if (_rtl_state == RTL_STATE_RETURN) {
-		_mission_item.altitude_is_relative = false;
-		_mission_item.altitude = _global_pos.alt;
-	}
-
-	_reset_loiter_pos = true;
-	set_rtl_item();
-}
-
-void
-Navigator::start_land()
-{
-	reset_reached();
-
-	/* this state can be requested by commander even if no global position available,
-	 * in his case controller must perform landing without position control */
-	_do_takeoff = false;
-	_reset_loiter_pos = true;
-
-	memcpy(&_pos_sp_triplet.previous, &_pos_sp_triplet.current, sizeof(position_setpoint_s));
-
-	_mission_item_valid = true;
-
-	_mission_item.lat = _global_pos.lat;
-	_mission_item.lon = _global_pos.lon;
-	_mission_item.altitude_is_relative = false;
-	_mission_item.altitude = _global_pos.alt;
-	_mission_item.yaw = NAN;
-	_mission_item.loiter_radius = _parameters.loiter_radius;
-	_mission_item.loiter_direction = 1;
-	_mission_item.nav_cmd = NAV_CMD_LAND;
-	_mission_item.acceptance_radius = _parameters.acceptance_radius;
-	_mission_item.time_inside = 0.0f;
-	_mission_item.pitch_min = 0.0f;
-	_mission_item.autocontinue = true;
-	_mission_item.origin = ORIGIN_ONBOARD;
-
-	position_setpoint_from_mission_item(&_pos_sp_triplet.current, &_mission_item);
-
-	_pos_sp_triplet.next.valid = false;
-}
-
-void
-Navigator::start_land_home()
-{
-	reset_reached();
-
-	/* land to home position, should be called when hovering above home, from RTL state */
-	_do_takeoff = false;
-	_reset_loiter_pos = true;
-
-	memcpy(&_pos_sp_triplet.previous, &_pos_sp_triplet.current, sizeof(position_setpoint_s));
-
-	_mission_item_valid = true;
-
-	_mission_item.lat = _home_pos.lat;
-	_mission_item.lon = _home_pos.lon;
-	_mission_item.altitude_is_relative = false;
-	_mission_item.altitude = _home_pos.alt;
-	_mission_item.yaw = NAN;
-	_mission_item.loiter_radius = _parameters.loiter_radius;
-	_mission_item.loiter_direction = 1;
-	_mission_item.nav_cmd = NAV_CMD_LAND;
-	_mission_item.acceptance_radius = _parameters.acceptance_radius;
-	_mission_item.time_inside = 0.0f;
-	_mission_item.pitch_min = 0.0f;
-	_mission_item.autocontinue = true;
-	_mission_item.origin = ORIGIN_ONBOARD;
-
-	position_setpoint_from_mission_item(&_pos_sp_triplet.current, &_mission_item);
-
-	_pos_sp_triplet.next.valid = false;
-}
-
-void
-Navigator::set_rtl_item()
-{
-	reset_reached();
-
-	switch (_rtl_state) {
-	case RTL_STATE_CLIMB: {
-			memcpy(&_pos_sp_triplet.previous, &_pos_sp_triplet.current, sizeof(position_setpoint_s));
-
-			float climb_alt = _home_pos.alt + _parameters.rtl_alt;
-
-			if (_vstatus.condition_landed) {
-				climb_alt = fmaxf(climb_alt, _global_pos.alt + _parameters.rtl_alt);
-			}
-
-			_mission_item_valid = true;
-
-			_mission_item.lat = _global_pos.lat;
-			_mission_item.lon = _global_pos.lon;
-			_mission_item.altitude_is_relative = false;
-			_mission_item.altitude = climb_alt;
-			_mission_item.yaw = NAN;
-			_mission_item.loiter_radius = _parameters.loiter_radius;
-			_mission_item.loiter_direction = 1;
-			_mission_item.nav_cmd = NAV_CMD_TAKEOFF;
-			_mission_item.acceptance_radius = _parameters.acceptance_radius;
-			_mission_item.time_inside = 0.0f;
-			_mission_item.pitch_min = 0.0f;
-			_mission_item.autocontinue = true;
-			_mission_item.origin = ORIGIN_ONBOARD;
-
-			position_setpoint_from_mission_item(&_pos_sp_triplet.current, &_mission_item);
-
-			_pos_sp_triplet.next.valid = false;
-
-			mavlink_log_info(_mavlink_fd, "#audio: RTL: climb to %.1fm above home", (double)(climb_alt - _home_pos.alt));
-			break;
-		}
-
-	case RTL_STATE_RETURN: {
-			memcpy(&_pos_sp_triplet.previous, &_pos_sp_triplet.current, sizeof(position_setpoint_s));
-
-			_mission_item_valid = true;
-
-			_mission_item.lat = _home_pos.lat;
-			_mission_item.lon = _home_pos.lon;
-			// don't change altitude
-			if (_pos_sp_triplet.previous.valid) {
-				/* if previous setpoint is valid then use it to calculate heading to home */
-				_mission_item.yaw = get_bearing_to_next_waypoint(_pos_sp_triplet.previous.lat, _pos_sp_triplet.previous.lon, _mission_item.lat, _mission_item.lon);
-
-			} else {
-				/* else use current position */
-				_mission_item.yaw = get_bearing_to_next_waypoint(_global_pos.lat, _global_pos.lon, _mission_item.lat, _mission_item.lon);
-			}
-			_mission_item.loiter_radius = _parameters.loiter_radius;
-			_mission_item.loiter_direction = 1;
-			_mission_item.nav_cmd = NAV_CMD_WAYPOINT;
-			_mission_item.acceptance_radius = _parameters.acceptance_radius;
-			_mission_item.time_inside = 0.0f;
-			_mission_item.pitch_min = 0.0f;
-			_mission_item.autocontinue = true;
-			_mission_item.origin = ORIGIN_ONBOARD;
-
-			position_setpoint_from_mission_item(&_pos_sp_triplet.current, &_mission_item);
-
-			_pos_sp_triplet.next.valid = false;
-
-			mavlink_log_info(_mavlink_fd, "#audio: RTL: return at %.1fm above home", (double)(_mission_item.altitude - _home_pos.alt));
-			break;
-		}
-
-	case RTL_STATE_DESCEND: {
-			memcpy(&_pos_sp_triplet.previous, &_pos_sp_triplet.current, sizeof(position_setpoint_s));
-
-			_mission_item_valid = true;
-
-			_mission_item.lat = _home_pos.lat;
-			_mission_item.lon = _home_pos.lon;
-			_mission_item.altitude_is_relative = false;
-			_mission_item.altitude = _home_pos.alt + _parameters.land_alt;
-			_mission_item.yaw = NAN;
-			_mission_item.loiter_radius = _parameters.loiter_radius;
-			_mission_item.loiter_direction = 1;
-			_mission_item.nav_cmd = NAV_CMD_WAYPOINT;
-			_mission_item.acceptance_radius = _parameters.acceptance_radius;
-			_mission_item.time_inside = _parameters.rtl_land_delay < 0.0f ? 0.0f : _parameters.rtl_land_delay;
-			_mission_item.pitch_min = 0.0f;
-			_mission_item.autocontinue = _parameters.rtl_land_delay > -0.001f;
-			_mission_item.origin = ORIGIN_ONBOARD;
-
-			position_setpoint_from_mission_item(&_pos_sp_triplet.current, &_mission_item);
-
-			_pos_sp_triplet.next.valid = false;
-
-			mavlink_log_info(_mavlink_fd, "#audio: RTL: descend to %.1fm above home", (double)(_mission_item.altitude - _home_pos.alt));
-			break;
-		}
-
-	default: {
-			mavlink_log_critical(_mavlink_fd, "#audio: [navigator] error: unknown RTL state: %d", _rtl_state);
-			start_loiter();
-			break;
-		}
-	}
-
-	_pos_sp_triplet_updated = true;
-}
-
-void
-Navigator::request_loiter_or_ready()
-{
-	/* XXX workaround: no landing detector for fixedwing yet */
-	if (_vstatus.condition_landed && _vstatus.is_rotary_wing) {
-		dispatch(EVENT_READY_REQUESTED);
-
-	} else {
-		dispatch(EVENT_LOITER_REQUESTED);
-	}
-}
-
-void
-Navigator::request_mission_if_available()
-{
-	if (_mission.current_mission_available()) {
-		dispatch(EVENT_MISSION_REQUESTED);
-
-	} else {
-		request_loiter_or_ready();
-	}
-}
-
-void
-Navigator::position_setpoint_from_mission_item(position_setpoint_s *sp, mission_item_s *item)
-{
-	sp->valid = true;
-
-	if (item->nav_cmd == NAV_CMD_RETURN_TO_LAUNCH) {
-		/* set home position for RTL item */
-		sp->lat = _home_pos.lat;
-		sp->lon = _home_pos.lon;
-		sp->alt = _home_pos.alt + _parameters.rtl_alt;
-
-		if (_pos_sp_triplet.previous.valid) {
-			/* if previous setpoint is valid then use it to calculate heading to home */
-			sp->yaw = get_bearing_to_next_waypoint(_pos_sp_triplet.previous.lat, _pos_sp_triplet.previous.lon, sp->lat, sp->lon);
-
-		} else {
-			/* else use current position */
-			sp->yaw = get_bearing_to_next_waypoint(_global_pos.lat, _global_pos.lon, sp->lat, sp->lon);
-		}
-		sp->loiter_radius = _parameters.loiter_radius;
-		sp->loiter_direction = 1;
-		sp->pitch_min = 0.0f;
-
-	} else {
-		sp->lat = item->lat;
-		sp->lon = item->lon;
-		sp->alt = item->altitude_is_relative ? item->altitude + _home_pos.alt : item->altitude;
-		sp->yaw = item->yaw;
-		sp->loiter_radius = item->loiter_radius;
-		sp->loiter_direction = item->loiter_direction;
-		sp->pitch_min = item->pitch_min;
-	}
-
-	if (item->nav_cmd == NAV_CMD_TAKEOFF) {
-		sp->type = SETPOINT_TYPE_TAKEOFF;
-
-	} else if (item->nav_cmd == NAV_CMD_LAND) {
-		sp->type = SETPOINT_TYPE_LAND;
-
-	} else if (item->nav_cmd == NAV_CMD_LOITER_TIME_LIMIT ||
-		   item->nav_cmd == NAV_CMD_LOITER_TURN_COUNT ||
-		   item->nav_cmd == NAV_CMD_LOITER_UNLIMITED) {
-		sp->type = SETPOINT_TYPE_LOITER;
-
-	} else {
-		sp->type = SETPOINT_TYPE_NORMAL;
-	}
-}
-
-bool
-Navigator::check_mission_item_reached()
-{
-	/* only check if there is actually a mission item to check */
-	if (!_mission_item_valid) {
-		return false;
-	}
-
-	if (_mission_item.nav_cmd == NAV_CMD_LAND) {
-		return _vstatus.condition_landed;
-	}
-
-	/* XXX TODO count turns */
-	if ((_mission_item.nav_cmd == NAV_CMD_LOITER_TURN_COUNT ||
-	     _mission_item.nav_cmd == NAV_CMD_LOITER_TIME_LIMIT ||
-	     _mission_item.nav_cmd == NAV_CMD_LOITER_UNLIMITED) &&
-	    _mission_item.loiter_radius > 0.01f) {
-
-		return false;
-	}
-
-	uint64_t now = hrt_absolute_time();
-
-	if (!_waypoint_position_reached) {
-		float acceptance_radius;
-
-		if (_mission_item.nav_cmd == NAV_CMD_WAYPOINT && _mission_item.acceptance_radius > 0.01f) {
-			acceptance_radius = _mission_item.acceptance_radius;
-
-		} else {
-			acceptance_radius = _parameters.acceptance_radius;
-		}
-
-		float dist = -1.0f;
-		float dist_xy = -1.0f;
-		float dist_z = -1.0f;
-
-		/* calculate AMSL altitude for this waypoint */
-		float wp_alt_amsl = _mission_item.altitude;
-
-		if (_mission_item.altitude_is_relative)
-			wp_alt_amsl += _home_pos.alt;
-
-		dist = get_distance_to_point_global_wgs84(_mission_item.lat, _mission_item.lon, wp_alt_amsl,
-				(double)_global_pos.lat, (double)_global_pos.lon, _global_pos.alt,
-				&dist_xy, &dist_z);
-
-		if (_do_takeoff) {
-			if (_global_pos.alt > wp_alt_amsl - acceptance_radius) {
-				/* require only altitude for takeoff */
-				_waypoint_position_reached = true;
-			}
-
-		} else {
-			if (dist >= 0.0f && dist <= acceptance_radius) {
-				_waypoint_position_reached = true;
-			}
-		}
-	}
-
-	if (_waypoint_position_reached && !_waypoint_yaw_reached) {
-		if (_vstatus.is_rotary_wing && !_do_takeoff && isfinite(_mission_item.yaw)) {
-			/* check yaw if defined only for rotary wing except takeoff */
-			float yaw_err = _wrap_pi(_mission_item.yaw - _global_pos.yaw);
-
-			if (fabsf(yaw_err) < 0.2f) { /* XXX get rid of magic number */
-				_waypoint_yaw_reached = true;
-			}
-
-		} else {
-			_waypoint_yaw_reached = true;
-		}
-	}
-
-	/* check if the current waypoint was reached */
-	if (_waypoint_position_reached && _waypoint_yaw_reached) {
-		if (_time_first_inside_orbit == 0) {
-			_time_first_inside_orbit = now;
-
-			if (_mission_item.time_inside > 0.01f) {
-				mavlink_log_info(_mavlink_fd, "#audio: waypoint reached, wait for %.1fs", (double)_mission_item.time_inside);
-			}
-		}
-
-		/* check if the MAV was long enough inside the waypoint orbit */
-		if ((now - _time_first_inside_orbit >= (uint64_t)_mission_item.time_inside * 1e6)
-		    || _mission_item.nav_cmd == NAV_CMD_TAKEOFF) {
-			reset_reached();
-			return true;
-		}
-	}
-
-	return false;
-
-}
-
-void
-Navigator::reset_reached()
-{
-	_time_first_inside_orbit = 0;
-	_waypoint_position_reached = false;
-	_waypoint_yaw_reached = false;
-
-}
-
-void
-Navigator::on_mission_item_reached()
-{
-	if (myState == NAV_STATE_MISSION) {
-
-		_mission.report_mission_item_reached();
-
-		if (_do_takeoff) {
-			/* takeoff completed */
-			_do_takeoff = false;
-			mavlink_log_info(_mavlink_fd, "#audio: takeoff completed");
-
-		} else {
-			/* advance by one mission item */
-			_mission.move_to_next();
-		}
-
-		if (_mission.current_mission_available()) {
-			set_mission_item();
-
-		} else {
-			/* if no more mission items available then finish mission */
-			/* loiter at last waypoint */
-			_reset_loiter_pos = false;
-			mavlink_log_info(_mavlink_fd, "[navigator] mission completed");
-			request_loiter_or_ready();
-		}
-
-	} else if (myState == NAV_STATE_RTL) {
-		/* RTL completed */
-		if (_rtl_state == RTL_STATE_DESCEND) {
-			/* hovering above home position, land if needed or loiter */
-			mavlink_log_info(_mavlink_fd, "[navigator] RTL completed");
-
-			if (_mission_item.autocontinue) {
-				dispatch(EVENT_LAND_REQUESTED);
-
-			} else {
-				_reset_loiter_pos = false;
-				dispatch(EVENT_LOITER_REQUESTED);
-			}
-
-		} else {
-			/* next RTL step */
-			_rtl_state = (RTLState)(_rtl_state + 1);
-			set_rtl_item();
-		}
-
-	} else if (myState == NAV_STATE_LAND) {
-		/* landing completed */
-		mavlink_log_info(_mavlink_fd, "[navigator] landing completed");
-		dispatch(EVENT_READY_REQUESTED);
-	}
-	_mission.publish_mission_result();
 }
 
 void
 Navigator::publish_position_setpoint_triplet()
 {
 	/* update navigation state */
-	_pos_sp_triplet.nav_state = static_cast<nav_state_t>(myState);
+	/* TODO: set nav_state */
 
 	/* lazily publish the position setpoint triplet only once available */
 	if (_pos_sp_triplet_pub > 0) {
-		/* publish the position setpoint triplet */
 		orb_publish(ORB_ID(position_setpoint_triplet), _pos_sp_triplet_pub, &_pos_sp_triplet);
 
 	} else {
-		/* advertise and publish */
 		_pos_sp_triplet_pub = orb_advertise(ORB_ID(position_setpoint_triplet), &_pos_sp_triplet);
 	}
 }
diff --git a/src/modules/navigator/navigator_mission.cpp b/src/modules/navigator/navigator_mission.cpp
deleted file mode 100644
index 72dddebfe..000000000
--- a/src/modules/navigator/navigator_mission.cpp
+++ /dev/null
@@ -1,318 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
- *   Author: @author Julian Oes <joes@student.ethz.ch>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-/**
- * @file navigator_mission.cpp
- * Helper class to access missions
- */
-
-#include <string.h>
-#include <stdlib.h>
-#include <dataman/dataman.h>
-#include <systemlib/err.h>
-#include <uORB/uORB.h>
-#include <uORB/topics/mission_result.h>
-#include "navigator_mission.h"
-
-/* oddly, ERROR is not defined for c++ */
-#ifdef ERROR
-# undef ERROR
-#endif
-static const int ERROR = -1;
-
-
-Mission::Mission() :
-
-	_offboard_dataman_id(-1),
-	_current_offboard_mission_index(0),
-	_current_onboard_mission_index(0),
-	_offboard_mission_item_count(0),
-	_onboard_mission_item_count(0),
-	_onboard_mission_allowed(false),
-	_current_mission_type(MISSION_TYPE_NONE),
-	_mission_result_pub(-1)
-{
-	memset(&_mission_result, 0, sizeof(struct mission_result_s));
-}
-
-Mission::~Mission()
-{
-
-}
-
-void
-Mission::set_offboard_dataman_id(int new_id)
-{
-	_offboard_dataman_id = new_id;
-}
-
-void
-Mission::set_current_offboard_mission_index(int new_index)
-{
-	if (new_index != -1) {
-		warnx("specifically set to %d", new_index);
-		_current_offboard_mission_index = (unsigned)new_index;
-	} else {
-
-		/* if less WPs available, reset to first WP */
-		if (_current_offboard_mission_index >= _offboard_mission_item_count) {
-			_current_offboard_mission_index = 0;
-		}
-	}
-	report_current_offboard_mission_item();
-}
-
-void
-Mission::set_current_onboard_mission_index(int new_index)
-{
-	if (new_index != -1) {
-		_current_onboard_mission_index = (unsigned)new_index;
-	} else {
-
-		/* if less WPs available, reset to first WP */
-		if (_current_onboard_mission_index >= _onboard_mission_item_count) {
-			_current_onboard_mission_index = 0;
-		}
-	}
-	// TODO: implement this for onboard missions as well
-	// report_current_mission_item();
-}
-
-void
-Mission::set_offboard_mission_count(unsigned new_count)
-{
-	_offboard_mission_item_count = new_count;
-}
-
-void
-Mission::set_onboard_mission_count(unsigned new_count)
-{
-	_onboard_mission_item_count = new_count;
-}
-
-void
-Mission::set_onboard_mission_allowed(bool allowed)
-{
-	_onboard_mission_allowed = allowed;
-}
-
-bool
-Mission::current_mission_available()
-{
-	return (current_onboard_mission_available() || current_offboard_mission_available());
-
-}
-
-bool
-Mission::next_mission_available()
-{
-	return (next_onboard_mission_available() || next_offboard_mission_available());
-}
-
-int
-Mission::get_current_mission_item(struct mission_item_s *new_mission_item, bool *onboard, unsigned *index)
-{
-	/* try onboard mission first */
-	if (current_onboard_mission_available()) {
-
-		const ssize_t len = sizeof(struct mission_item_s);
-
-		if (dm_read(DM_KEY_WAYPOINTS_ONBOARD, _current_onboard_mission_index, new_mission_item, len) != len) {
-			/* not supposed to happen unless the datamanager can't access the SD card, etc. */
-			return ERROR;
-		}
-
-		_current_mission_type = MISSION_TYPE_ONBOARD;
-		*onboard = true;
-		*index = _current_onboard_mission_index;
-
-		/* otherwise fallback to offboard */
-
-	} else if (current_offboard_mission_available()) {
-
-		dm_item_t dm_current;
-
-		if (_offboard_dataman_id == 0) {
-			dm_current = DM_KEY_WAYPOINTS_OFFBOARD_0;
-
-		} else {
-			dm_current = DM_KEY_WAYPOINTS_OFFBOARD_1;
-		}
-
-		const ssize_t len = sizeof(struct mission_item_s);
-
-		if (dm_read(dm_current, _current_offboard_mission_index, new_mission_item, len) != len) {
-			/* not supposed to happen unless the datamanager can't access the SD card, etc. */
-			_current_mission_type = MISSION_TYPE_NONE;
-			return ERROR;
-		}
-
-		_current_mission_type = MISSION_TYPE_OFFBOARD;
-		*onboard = false;
-		*index = _current_offboard_mission_index;
-
-	} else {
-		/* happens when no more mission items can be added as a next item */
-		_current_mission_type = MISSION_TYPE_NONE;
-		return ERROR;
-	}
-
-	return OK;
-}
-
-int
-Mission::get_next_mission_item(struct mission_item_s *new_mission_item)
-{
-	/* try onboard mission first */
-	if (next_onboard_mission_available()) {
-
-		const ssize_t len = sizeof(struct mission_item_s);
-
-		if (dm_read(DM_KEY_WAYPOINTS_ONBOARD, _current_onboard_mission_index + 1, new_mission_item, len) != len) {
-			/* not supposed to happen unless the datamanager can't access the SD card, etc. */
-			return ERROR;
-		}
-
-		/* otherwise fallback to offboard */
-
-	} else if (next_offboard_mission_available()) {
-
-		dm_item_t dm_current;
-
-		if (_offboard_dataman_id == 0) {
-			dm_current = DM_KEY_WAYPOINTS_OFFBOARD_0;
-
-		} else {
-			dm_current = DM_KEY_WAYPOINTS_OFFBOARD_1;
-		}
-
-		const ssize_t len = sizeof(struct mission_item_s);
-
-		if (dm_read(dm_current, _current_offboard_mission_index + 1, new_mission_item, len) != len) {
-			/* not supposed to happen unless the datamanager can't access the SD card, etc. */
-			return ERROR;
-		}
-
-	} else {
-		/* happens when no more mission items can be added as a next item */
-		return ERROR;
-	}
-
-	return OK;
-}
-
-
-bool
-Mission::current_onboard_mission_available()
-{
-	return _onboard_mission_item_count > _current_onboard_mission_index && _onboard_mission_allowed;
-}
-
-bool
-Mission::current_offboard_mission_available()
-{
-	return _offboard_mission_item_count > _current_offboard_mission_index;
-}
-
-bool
-Mission::next_onboard_mission_available()
-{
-	unsigned next = 0;
-
-	if (_current_mission_type != MISSION_TYPE_ONBOARD) {
-		next = 1;
-	}
-
-	return _onboard_mission_item_count > (_current_onboard_mission_index + next) && _onboard_mission_allowed;
-}
-
-bool
-Mission::next_offboard_mission_available()
-{
-	unsigned next = 0;
-
-	if (_current_mission_type != MISSION_TYPE_OFFBOARD) {
-		next = 1;
-	}
-
-	return _offboard_mission_item_count > (_current_offboard_mission_index + next);
-}
-
-void
-Mission::move_to_next()
-{
-	switch (_current_mission_type) {
-	case MISSION_TYPE_ONBOARD:
-		_current_onboard_mission_index++;
-		break;
-
-	case MISSION_TYPE_OFFBOARD:
-		_current_offboard_mission_index++;
-		break;
-
-	case MISSION_TYPE_NONE:
-	default:
-		break;
-	}
-}
-
-void
-Mission::report_mission_item_reached()
-{
-	if (_current_mission_type == MISSION_TYPE_OFFBOARD) {
-		_mission_result.mission_reached = true;
-		_mission_result.mission_index_reached = _current_offboard_mission_index;
-	}
-}
-
-void
-Mission::report_current_offboard_mission_item()
-{
-	_mission_result.index_current_mission = _current_offboard_mission_index;
-}
-
-void
-Mission::publish_mission_result()
-{
-	/* lazily publish the mission result only once available */
-	if (_mission_result_pub > 0) {
-		/* publish mission result */
-		orb_publish(ORB_ID(mission_result), _mission_result_pub, &_mission_result);
-
-	} else {
-		/* advertise and publish */
-		_mission_result_pub = orb_advertise(ORB_ID(mission_result), &_mission_result);
-	}
-	/* reset reached bool */
-	_mission_result.mission_reached = false;
-}
diff --git a/src/modules/att_pos_estimator_ekf/params.c b/src/modules/navigator/navigator_mode.cpp
index 4af5edead..25e767c2b 100644
--- a/src/modules/att_pos_estimator_ekf/params.c
+++ b/src/modules/navigator/navigator_mode.cpp
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -30,20 +30,41 @@
  * POSSIBILITY OF SUCH DAMAGE.
  *
  ****************************************************************************/
+/**
+ * @file navigator_mode.cpp
+ *
+ * Helper class for different modes in navigator
+ *
+ * @author Julian Oes <julian@oes.ch>
+ */
+
+#include "navigator_mode.h"
+
+NavigatorMode::NavigatorMode(Navigator *navigator, const char *name) :
+	SuperBlock(NULL, name),
+	_navigator(navigator),
+	_first_run(true)
+{
+	/* load initial params */
+	updateParams();
+	/* set initial mission items */
+	on_inactive();
+}
+
+NavigatorMode::~NavigatorMode()
+{
+}
 
-#include <systemlib/param/param.h>
+void
+NavigatorMode::on_inactive()
+{
+	_first_run = true;
+}
 
-/*PARAM_DEFINE_FLOAT(NAME,0.0f);*/
-PARAM_DEFINE_FLOAT(KF_V_GYRO, 0.008f);
-PARAM_DEFINE_FLOAT(KF_V_ACCEL, 1.0f);
-PARAM_DEFINE_FLOAT(KF_R_MAG, 0.8f);
-PARAM_DEFINE_FLOAT(KF_R_GPS_VEL, 0.5f);
-PARAM_DEFINE_FLOAT(KF_R_GPS_POS, 2.0f);
-PARAM_DEFINE_FLOAT(KF_R_GPS_ALT, 3.0f);
-PARAM_DEFINE_FLOAT(KF_R_PRESS_ALT, 0.1f);
-PARAM_DEFINE_FLOAT(KF_R_ACCEL, 1.0f);
-PARAM_DEFINE_FLOAT(KF_FAULT_POS, 10.0f);
-PARAM_DEFINE_FLOAT(KF_FAULT_ATT, 10.0f);
-PARAM_DEFINE_FLOAT(KF_ENV_G, 9.765f);
-PARAM_DEFINE_FLOAT(KF_ENV_MAG_DIP, 60.0f);
-PARAM_DEFINE_FLOAT(KF_ENV_MAG_DEC, 0.0f);
+bool
+NavigatorMode::on_active(struct position_setpoint_triplet_s *pos_sp_triplet)
+{
+	pos_sp_triplet->current.valid = false;
+	_first_run = false;
+	return false;
+}
diff --git a/src/modules/navigator/navigator_mode.h b/src/modules/navigator/navigator_mode.h
new file mode 100644
index 000000000..cbb53d91b
--- /dev/null
+++ b/src/modules/navigator/navigator_mode.h
@@ -0,0 +1,86 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+/**
+ * @file navigator_mode.h
+ *
+ * Helper class for different modes in navigator
+ *
+ * @author Julian Oes <julian@oes.ch>
+ */
+
+#ifndef NAVIGATOR_MODE_H
+#define NAVIGATOR_MODE_H
+
+#include <drivers/drv_hrt.h>
+
+#include <controllib/blocks.hpp>
+#include <controllib/block/BlockParam.hpp>
+
+#include <dataman/dataman.h>
+
+#include <uORB/topics/position_setpoint_triplet.h>
+
+class Navigator;
+
+class NavigatorMode : public control::SuperBlock
+{
+public:
+	/**
+	 * Constructor
+	 */
+	NavigatorMode(Navigator *navigator, const char *name);
+
+	/**
+	 * Destructor
+	 */
+	virtual ~NavigatorMode();
+
+	/**
+	 * This function is called while the mode is inactive
+	 */
+	virtual void on_inactive();
+
+	/**
+	 * This function is called while the mode is active
+	 *
+	 * @param position setpoint triplet to set
+	 * @return true if position setpoint triplet has been changed
+	 */
+	virtual bool on_active(struct position_setpoint_triplet_s *pos_sp_triplet);
+
+protected:
+	Navigator *_navigator;
+	bool _first_run;
+};
+
+#endif
diff --git a/src/modules/navigator/navigator_params.c b/src/modules/navigator/navigator_params.c
index 9ef359c6d..084afe340 100644
--- a/src/modules/navigator/navigator_params.c
+++ b/src/modules/navigator/navigator_params.c
@@ -1,9 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
- *   Author: @author Lorenz Meier <lm@inf.ethz.ch>
- *           @author Julian Oes <joes@student.ethz.ch>
- *           @author Anton Babushkin <anton.babushkin@me.com>
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -20,7 +17,7 @@
  *    without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
@@ -37,104 +34,33 @@
 /**
  * @file navigator_params.c
  *
- * Parameters defined by the navigator task.
+ * Parameters for navigator in general
  *
- * @author Lorenz Meier <lm@inf.ethz.ch>
- * @author Julian Oes <joes@student.ethz.ch>
- * @author Anton Babushkin <anton.babushkin@me.com>
+ * @author Julian Oes <julian@oes.ch>
  */
 
 #include <nuttx/config.h>
 
 #include <systemlib/param/param.h>
 
-/*
- * Navigator parameters, accessible via MAVLink
- */
-
-/**
- * Minimum altitude (fixed wing only)
- *
- * Minimum altitude above home for LOITER.
- *
- * @unit meters
- * @group Navigation
- */
-PARAM_DEFINE_FLOAT(NAV_MIN_ALT, 50.0f);
-
-/**
- * Waypoint acceptance radius
- *
- * Default value of acceptance radius (if not specified in mission item).
- *
- * @unit meters
- * @min 0.0
- * @group Navigation
- */
-PARAM_DEFINE_FLOAT(NAV_ACCEPT_RAD, 10.0f);
-
 /**
- * Loiter radius (fixed wing only)
+ * Loiter radius (FW only)
  *
- * Default value of loiter radius (if not specified in mission item).
+ * Default value of loiter radius for missions, loiter, RTL, etc. (fixedwing only).
  *
  * @unit meters
  * @min 0.0
- * @group Navigation
+ * @group Mission
  */
 PARAM_DEFINE_FLOAT(NAV_LOITER_RAD, 50.0f);
 
 /**
- * Enable onboard mission
- *
- * @group Navigation
- */
-PARAM_DEFINE_INT32(NAV_ONB_MIS_EN, 0);
-
-/**
- * Take-off altitude
- *
- * Even if first waypoint has altitude less then NAV_TAKEOFF_ALT above home position, system will climb to NAV_TAKEOFF_ALT on takeoff, then go to waypoint.
- *
- * @unit meters
- * @group Navigation
- */
-PARAM_DEFINE_FLOAT(NAV_TAKEOFF_ALT, 10.0f);
-
-/**
- * Landing altitude
- *
- * Stay at this altitude above home position after RTL descending. Land (i.e. slowly descend) from this altitude if autolanding allowed.
- *
- * @unit meters
- * @group Navigation
- */
-PARAM_DEFINE_FLOAT(NAV_LAND_ALT, 5.0f);
-
-/**
- * Return-To-Launch altitude
+ * Acceptance Radius
  *
- * Minimum altitude above home position for going home in RTL mode.
+ * Default acceptance radius, overridden by acceptance radius of waypoint if set.
  *
  * @unit meters
- * @group Navigation
- */
-PARAM_DEFINE_FLOAT(NAV_RTL_ALT, 30.0f);
-
-/**
- * Return-To-Launch delay
- *
- * Delay after descend before landing in RTL mode.
- * If set to -1 the system will not land but loiter at NAV_LAND_ALT.
- *
- * @unit seconds
- * @group Navigation
- */
-PARAM_DEFINE_FLOAT(NAV_RTL_LAND_T, -1.0f);
-
-/**
- * Enable parachute deployment
- *
- * @group Navigation
+ * @min 1.0
+ * @group Mission
  */
-PARAM_DEFINE_INT32(NAV_PARACHUTE_EN, 0);
+PARAM_DEFINE_FLOAT(NAV_ACC_RAD, 25.0f);
diff --git a/src/modules/navigator/navigator_state.h b/src/modules/navigator/navigator_state.h
deleted file mode 100644
index 6a1475c9b..000000000
--- a/src/modules/navigator/navigator_state.h
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
- * navigator_state.h
- *
- *  Created on: 27.01.2014
- *      Author: ton
- */
-
-#ifndef NAVIGATOR_STATE_H_
-#define NAVIGATOR_STATE_H_
-
-typedef enum {
-	NAV_STATE_NONE = 0,
-	NAV_STATE_READY,
-	NAV_STATE_LOITER,
-	NAV_STATE_MISSION,
-	NAV_STATE_RTL,
-	NAV_STATE_LAND,
-	NAV_STATE_MAX
-} nav_state_t;
-
-#endif /* NAVIGATOR_STATE_H_ */
diff --git a/src/modules/navigator/rtl.cpp b/src/modules/navigator/rtl.cpp
new file mode 100644
index 000000000..597a2c0ec
--- /dev/null
+++ b/src/modules/navigator/rtl.cpp
@@ -0,0 +1,320 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2013-2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+/**
+ * @file navigator_rtl.cpp
+ * Helper class to access RTL
+ * @author Julian Oes <julian@oes.ch>
+ * @author Anton Babushkin <anton.babushkin@me.com>
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <math.h>
+#include <fcntl.h>
+
+#include <mavlink/mavlink_log.h>
+#include <systemlib/err.h>
+#include <geo/geo.h>
+
+#include <uORB/uORB.h>
+#include <uORB/topics/mission.h>
+#include <uORB/topics/home_position.h>
+
+#include "navigator.h"
+#include "rtl.h"
+
+#define DELAY_SIGMA	0.01f
+
+RTL::RTL(Navigator *navigator, const char *name) :
+	MissionBlock(navigator, name),
+	_rtl_state(RTL_STATE_NONE),
+	_param_return_alt(this, "RETURN_ALT"),
+	_param_descend_alt(this, "DESCEND_ALT"),
+	_param_land_delay(this, "LAND_DELAY")
+{
+	/* load initial params */
+	updateParams();
+	/* initial reset */
+	on_inactive();
+}
+
+RTL::~RTL()
+{
+}
+
+void
+RTL::on_inactive()
+{
+	_first_run = true;
+
+	/* reset RTL state only if setpoint moved */
+	if (!_navigator->get_can_loiter_at_sp()) {
+		_rtl_state = RTL_STATE_NONE;
+	}
+}
+
+bool
+RTL::on_active(struct position_setpoint_triplet_s *pos_sp_triplet)
+{
+	bool updated = false;
+
+	if (_first_run) {
+		_first_run = false;
+
+		/* decide where to enter the RTL procedure when we switch into it */
+		if (_rtl_state == RTL_STATE_NONE) {
+			/* for safety reasons don't go into RTL if landed */
+			if (_navigator->get_vstatus()->condition_landed) {
+				_rtl_state = RTL_STATE_LANDED;
+				mavlink_log_info(_navigator->get_mavlink_fd(), "#audio: no RTL when landed");
+
+			/* if lower than return altitude, climb up first */
+			} else if (_navigator->get_global_position()->alt < _navigator->get_home_position()->alt
+				   + _param_return_alt.get()) {
+				_rtl_state = RTL_STATE_CLIMB;
+
+			/* otherwise go straight to return */
+			} else {
+				/* set altitude setpoint to current altitude */
+				_rtl_state = RTL_STATE_RETURN;
+				_mission_item.altitude_is_relative = false;
+				_mission_item.altitude = _navigator->get_global_position()->alt;
+			}
+		}
+
+		set_rtl_item(pos_sp_triplet);
+		updated = true;
+
+	} else if (_rtl_state != RTL_STATE_LANDED && is_mission_item_reached()) {
+		advance_rtl();
+		set_rtl_item(pos_sp_triplet);
+		updated = true;
+	}
+
+	return updated;
+}
+
+void
+RTL::set_rtl_item(position_setpoint_triplet_s *pos_sp_triplet)
+{
+	/* make sure we have the latest params */
+	updateParams();
+
+	set_previous_pos_setpoint(pos_sp_triplet);
+	_navigator->set_can_loiter_at_sp(false);
+
+	switch (_rtl_state) {
+	case RTL_STATE_CLIMB: {
+		float climb_alt = _navigator->get_home_position()->alt + _param_return_alt.get();
+
+		_mission_item.lat = _navigator->get_global_position()->lat;
+		_mission_item.lon = _navigator->get_global_position()->lon;
+		_mission_item.altitude_is_relative = false;
+		_mission_item.altitude = climb_alt;
+		_mission_item.yaw = NAN;
+		_mission_item.loiter_radius = _navigator->get_loiter_radius();
+		_mission_item.loiter_direction = 1;
+		_mission_item.nav_cmd = NAV_CMD_WAYPOINT;
+		_mission_item.acceptance_radius = _navigator->get_acceptance_radius();
+		_mission_item.time_inside = 0.0f;
+		_mission_item.pitch_min = 0.0f;
+		_mission_item.autocontinue = true;
+		_mission_item.origin = ORIGIN_ONBOARD;
+
+		mavlink_log_info(_navigator->get_mavlink_fd(), "#audio: RTL: climb to %d meters above home",
+			(int)(climb_alt - _navigator->get_home_position()->alt));
+		break;
+	}
+
+	case RTL_STATE_RETURN: {
+		_mission_item.lat = _navigator->get_home_position()->lat;
+		_mission_item.lon = _navigator->get_home_position()->lon;
+		 // don't change altitude
+
+		 if (pos_sp_triplet->previous.valid) {
+		 	/* if previous setpoint is valid then use it to calculate heading to home */
+		 	_mission_item.yaw = get_bearing_to_next_waypoint(
+		 	        pos_sp_triplet->previous.lat, pos_sp_triplet->previous.lon,
+		 	        _mission_item.lat, _mission_item.lon);
+
+		 } else {
+		 	/* else use current position */
+		 	_mission_item.yaw = get_bearing_to_next_waypoint(
+		 	        _navigator->get_global_position()->lat, _navigator->get_global_position()->lon,
+		 	        _mission_item.lat, _mission_item.lon);
+		 }
+		_mission_item.loiter_radius = _navigator->get_loiter_radius();
+		_mission_item.loiter_direction = 1;
+		_mission_item.nav_cmd = NAV_CMD_WAYPOINT;
+		_mission_item.acceptance_radius = _navigator->get_acceptance_radius();
+		_mission_item.time_inside = 0.0f;
+		_mission_item.pitch_min = 0.0f;
+		_mission_item.autocontinue = true;
+		_mission_item.origin = ORIGIN_ONBOARD;
+
+		mavlink_log_info(_navigator->get_mavlink_fd(), "#audio: RTL: return at %d meters above home",
+			(int)(_mission_item.altitude - _navigator->get_home_position()->alt));
+		break;
+	}
+
+	case RTL_STATE_DESCEND: {
+		_mission_item.lat = _navigator->get_home_position()->lat;
+		_mission_item.lon = _navigator->get_home_position()->lon;
+		_mission_item.altitude_is_relative = false;
+		_mission_item.altitude = _navigator->get_home_position()->alt + _param_descend_alt.get();
+		_mission_item.yaw = NAN;
+		_mission_item.loiter_radius = _navigator->get_loiter_radius();
+		_mission_item.loiter_direction = 1;
+		_mission_item.nav_cmd = NAV_CMD_LOITER_TIME_LIMIT;
+		_mission_item.acceptance_radius = _navigator->get_acceptance_radius();
+		_mission_item.time_inside = 0.0f;
+		_mission_item.pitch_min = 0.0f;
+		_mission_item.autocontinue = false;
+		_mission_item.origin = ORIGIN_ONBOARD;
+
+		mavlink_log_info(_navigator->get_mavlink_fd(), "#audio: RTL: descend to %d meters above home",
+			(int)(_mission_item.altitude - _navigator->get_home_position()->alt));
+		break;
+	}
+
+	case RTL_STATE_LOITER: {
+		bool autoland = _param_land_delay.get() > -DELAY_SIGMA;
+
+		_mission_item.lat = _navigator->get_home_position()->lat;
+		_mission_item.lon = _navigator->get_home_position()->lon;
+		_mission_item.altitude_is_relative = false;
+		_mission_item.altitude = _navigator->get_home_position()->alt + _param_descend_alt.get();
+		_mission_item.yaw = NAN;
+		_mission_item.loiter_radius = _navigator->get_loiter_radius();
+		_mission_item.loiter_direction = 1;
+		_mission_item.nav_cmd = autoland ? NAV_CMD_LOITER_TIME_LIMIT : NAV_CMD_LOITER_UNLIMITED;
+		_mission_item.acceptance_radius = _navigator->get_acceptance_radius();
+		_mission_item.time_inside = _param_land_delay.get() < 0.0f ? 0.0f : _param_land_delay.get();
+		_mission_item.pitch_min = 0.0f;
+		_mission_item.autocontinue = autoland;
+		_mission_item.origin = ORIGIN_ONBOARD;
+
+		_navigator->set_can_loiter_at_sp(true);
+
+		if (autoland) {
+			mavlink_log_info(_navigator->get_mavlink_fd(), "#audio: RTL: loiter %.1fs", (double)_mission_item.time_inside);
+
+		} else {
+			mavlink_log_info(_navigator->get_mavlink_fd(), "#audio: RTL: completed, loiter");
+		}
+		break;
+	}
+
+	case RTL_STATE_LAND: {
+		_mission_item.lat = _navigator->get_home_position()->lat;
+		_mission_item.lon = _navigator->get_home_position()->lon;
+		_mission_item.altitude_is_relative = false;
+		_mission_item.altitude = _navigator->get_home_position()->alt;
+		_mission_item.yaw = NAN;
+		_mission_item.loiter_radius = _navigator->get_loiter_radius();
+		_mission_item.loiter_direction = 1;
+		_mission_item.nav_cmd = NAV_CMD_LAND;
+		_mission_item.acceptance_radius = _navigator->get_acceptance_radius();
+		_mission_item.time_inside = 0.0f;
+		_mission_item.pitch_min = 0.0f;
+		_mission_item.autocontinue = true;
+		_mission_item.origin = ORIGIN_ONBOARD;
+
+		mavlink_log_info(_navigator->get_mavlink_fd(), "#audio: RTL: land at home");
+		break;
+	}
+
+	case RTL_STATE_LANDED: {
+		_mission_item.lat = _navigator->get_home_position()->lat;
+		_mission_item.lon = _navigator->get_home_position()->lon;
+		_mission_item.altitude_is_relative = false;
+		_mission_item.altitude = _navigator->get_home_position()->alt;
+		_mission_item.yaw = NAN;
+		_mission_item.loiter_radius = _navigator->get_loiter_radius();
+		_mission_item.loiter_direction = 1;
+		_mission_item.nav_cmd = NAV_CMD_IDLE;
+		_mission_item.acceptance_radius = _navigator->get_acceptance_radius();
+		_mission_item.time_inside = 0.0f;
+		_mission_item.pitch_min = 0.0f;
+		_mission_item.autocontinue = true;
+		_mission_item.origin = ORIGIN_ONBOARD;
+
+		mavlink_log_info(_navigator->get_mavlink_fd(), "#audio: RTL: completed, landed");
+		break;
+	}
+
+	default:
+		break;
+	}
+
+	/* convert mission item to current position setpoint and make it valid */
+	mission_item_to_position_setpoint(&_mission_item, &pos_sp_triplet->current);
+	reset_mission_item_reached();
+	pos_sp_triplet->current.valid = true;
+	pos_sp_triplet->next.valid = false;
+}
+
+void
+RTL::advance_rtl()
+{
+	switch (_rtl_state) {
+	case RTL_STATE_CLIMB:
+		_rtl_state = RTL_STATE_RETURN;
+		break;
+
+	case RTL_STATE_RETURN:
+		_rtl_state = RTL_STATE_DESCEND;
+		break;
+
+	case RTL_STATE_DESCEND:
+		/* only go to land if autoland is enabled */
+		if (_param_land_delay.get() < -DELAY_SIGMA || _param_land_delay.get() > DELAY_SIGMA) {
+			_rtl_state = RTL_STATE_LOITER;
+
+		} else {
+			_rtl_state = RTL_STATE_LAND;
+		}
+		break;
+
+	case RTL_STATE_LOITER:
+		_rtl_state = RTL_STATE_LAND;
+		break;
+
+	case RTL_STATE_LAND:
+		_rtl_state = RTL_STATE_LANDED;
+		break;
+
+	default:
+		break;
+	}
+}
diff --git a/src/modules/navigator/rtl.h b/src/modules/navigator/rtl.h
new file mode 100644
index 000000000..b4b729e89
--- /dev/null
+++ b/src/modules/navigator/rtl.h
@@ -0,0 +1,110 @@
+/***************************************************************************
+ *
+ *   Copyright (c) 2013-2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+/**
+ * @file navigator_rtl.h
+ * Helper class for RTL
+ *
+ * @author Julian Oes <julian@oes.ch>
+ * @author Anton Babushkin <anton.babushkin@me.com>
+ */
+
+#ifndef NAVIGATOR_RTL_H
+#define NAVIGATOR_RTL_H
+
+#include <controllib/blocks.hpp>
+#include <controllib/block/BlockParam.hpp>
+
+#include <uORB/topics/mission.h>
+#include <uORB/topics/mission.h>
+#include <uORB/topics/home_position.h>
+#include <uORB/topics/vehicle_global_position.h>
+
+#include "navigator_mode.h"
+#include "mission_block.h"
+
+class Navigator;
+
+class RTL : public MissionBlock
+{
+public:
+	/**
+	 * Constructor
+	 */
+	RTL(Navigator *navigator, const char *name);
+
+	/**
+	 * Destructor
+	 */
+	~RTL();
+
+	/**
+	 * This function is called while the mode is inactive
+	 */
+	void on_inactive();
+
+	/**
+	 * This function is called while the mode is active
+	 *
+	 * @param position setpoint triplet that needs to be set
+	 * @return true if updated
+	 */
+	bool on_active(position_setpoint_triplet_s *pos_sp_triplet);
+
+
+private:
+	/**
+	 * Set the RTL item
+	 */
+	void		set_rtl_item(position_setpoint_triplet_s *pos_sp_triplet);
+
+	/**
+	 * Move to next RTL item
+	 */
+	void		advance_rtl();
+
+	enum RTLState {
+		RTL_STATE_NONE = 0,
+		RTL_STATE_CLIMB,
+		RTL_STATE_RETURN,
+		RTL_STATE_DESCEND,
+		RTL_STATE_LOITER,
+		RTL_STATE_LAND,
+		RTL_STATE_LANDED,
+	} _rtl_state;
+
+	control::BlockParamFloat _param_return_alt;
+	control::BlockParamFloat _param_descend_alt;
+	control::BlockParamFloat _param_land_delay;
+};
+
+#endif
diff --git a/src/modules/navigator/rtl_params.c b/src/modules/navigator/rtl_params.c
new file mode 100644
index 000000000..bfe6ce7e1
--- /dev/null
+++ b/src/modules/navigator/rtl_params.c
@@ -0,0 +1,98 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file rtl_params.c
+ *
+ * Parameters for RTL
+ *
+ * @author Julian Oes <julian@oes.ch>
+ */
+
+#include <nuttx/config.h>
+
+#include <systemlib/param/param.h>
+
+/*
+ * RTL parameters, accessible via MAVLink
+ */
+
+/**
+ * Loiter radius after RTL (FW only)
+ *
+ * Default value of loiter radius after RTL (fixedwing only).
+ *
+ * @unit meters
+ * @min 0.0
+ * @group RTL
+ */
+PARAM_DEFINE_FLOAT(RTL_LOITER_RAD, 50.0f);
+
+/**
+ * RTL altitude
+ *
+ * Altitude to fly back in RTL in meters
+ *
+ * @unit meters
+ * @min 0
+ * @max 1
+ * @group RTL
+ */
+PARAM_DEFINE_FLOAT(RTL_RETURN_ALT, 100);
+
+
+/**
+ * RTL loiter altitude
+ *
+ * Stay at this altitude above home position after RTL descending.
+ * Land (i.e. slowly descend) from this altitude if autolanding allowed.
+ *
+ * @unit meters
+ * @min 0
+ * @max 100
+ * @group RTL
+ */
+PARAM_DEFINE_FLOAT(RTL_DESCEND_ALT, 20);
+
+/**
+ * RTL delay
+ *
+ * Delay after descend before landing in RTL mode.
+ * If set to -1 the system will not land but loiter at NAV_LAND_ALT.
+ *
+ * @unit seconds
+ * @min -1
+ * @max
+ * @group RTL
+ */
+PARAM_DEFINE_FLOAT(RTL_LAND_DELAY, -1.0f);
diff --git a/src/modules/position_estimator/module.mk b/src/modules/position_estimator/module.mk
deleted file mode 100644
index f64095d9d..000000000
--- a/src/modules/position_estimator/module.mk
+++ /dev/null
@@ -1,44 +0,0 @@
-############################################################################
-#
-#   Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions
-# are met:
-#
-# 1. Redistributions of source code must retain the above copyright
-#    notice, this list of conditions and the following disclaimer.
-# 2. Redistributions in binary form must reproduce the above copyright
-#    notice, this list of conditions and the following disclaimer in
-#    the documentation and/or other materials provided with the
-#    distribution.
-# 3. Neither the name PX4 nor the names of its contributors may be
-#    used to endorse or promote products derived from this software
-#    without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
-# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
-# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-# POSSIBILITY OF SUCH DAMAGE.
-#
-############################################################################
-
-#
-# Makefile to build the position estimator
-#
-
-MODULE_COMMAND		= position_estimator
-
-# XXX this should be converted to a deamon, its a pretty bad example app
-MODULE_PRIORITY	 	= SCHED_PRIORITY_DEFAULT
-MODULE_STACKSIZE	= 4096
-
-SRCS		 	= position_estimator_main.c
diff --git a/src/modules/position_estimator/position_estimator_main.c b/src/modules/position_estimator/position_estimator_main.c
deleted file mode 100644
index e84945299..000000000
--- a/src/modules/position_estimator/position_estimator_main.c
+++ /dev/null
@@ -1,423 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (C) 2008-2012 PX4 Development Team. All rights reserved.
- *   Author: Tobias Naegeli <naegelit@student.ethz.ch>
- *			 Thomas Gubler <thomasgubler@student.ethz.ch>
- *           Julian Oes <joes@student.ethz.ch>
- *           Lorenz Meier <lm@inf.ethz.ch>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/**
- * @file position_estimator_main.c
- * Model-identification based position estimator for multirotors
- */
-
-#include <nuttx/config.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdbool.h>
-#include <fcntl.h>
-#include <float.h>
-#include <nuttx/sched.h>
-#include <sys/prctl.h>
-#include <termios.h>
-#include <errno.h>
-#include <limits.h>
-#include <math.h>
-#include <uORB/uORB.h>
-#include <uORB/topics/vehicle_status.h>
-#include <uORB/topics/vehicle_attitude.h>
-#include <uORB/topics/vehicle_gps_position.h>
-#include <uORB/topics/vehicle_global_position.h>
-#include <uORB/topics/vehicle_local_position.h>
-#include <poll.h>
-
-#define N_STATES 6
-#define ERROR_COVARIANCE_INIT 3
-#define R_EARTH 6371000.0
-
-#define PROJECTION_INITIALIZE_COUNTER_LIMIT 5000
-#define REPROJECTION_COUNTER_LIMIT 125
-
-__EXPORT int position_estimator_main(int argc, char *argv[]);
-
-static uint16_t position_estimator_counter_position_information;
-
-/* values for map projection */
-static double phi_1;
-static double sin_phi_1;
-static double cos_phi_1;
-static double lambda_0;
-static double scale;
-
-/**
- * Initializes the map transformation.
- *
- * Initializes the transformation between the geographic coordinate system and the azimuthal equidistant plane
- * @param lat in degrees (47.1234567°, not 471234567°)
- * @param lon in degrees (8.1234567°, not 81234567°)
- */
-static void map_projection_init(double lat_0, double lon_0) //lat_0, lon_0 are expected to be in correct format: -> 47.1234567 and not 471234567
-{
-	/* notation and formulas according to: http://mathworld.wolfram.com/AzimuthalEquidistantProjection.html */
-	phi_1 = lat_0 / 180.0 * M_PI;
-	lambda_0 = lon_0 / 180.0 * M_PI;
-
-	sin_phi_1 = sin(phi_1);
-	cos_phi_1 = cos(phi_1);
-
-	/* calculate local scale by using the relation of true distance and the distance on plane */ //TODO: this is a quick solution, there are probably easier ways to determine the scale
-
-	/* 1) calculate true distance d on sphere to a point: http://www.movable-type.co.uk/scripts/latlong.html */
-	const double r_earth = 6371000;
-
-	double lat1 = phi_1;
-	double lon1 = lambda_0;
-
-	double lat2 = phi_1 + 0.5 / 180 * M_PI;
-	double lon2 = lambda_0 + 0.5 / 180 * M_PI;
-	double sin_lat_2 = sin(lat2);
-	double cos_lat_2 = cos(lat2);
-	double d = acos(sin(lat1) * sin_lat_2 + cos(lat1) * cos_lat_2 * cos(lon2 - lon1)) * r_earth;
-
-	/* 2) calculate distance rho on plane */
-	double k_bar = 0;
-	double c =  acos(sin_phi_1 * sin_lat_2 + cos_phi_1 * cos_lat_2 * cos(lon2 - lambda_0));
-
-	if (0 != c)
-		k_bar = c / sin(c);
-
-	double x2 = k_bar * (cos_lat_2 * sin(lon2 - lambda_0)); //Projection of point 2 on plane
-	double y2 = k_bar * ((cos_phi_1 * sin_lat_2 - sin_phi_1 * cos_lat_2 * cos(lon2 - lambda_0)));
-	double rho = sqrt(pow(x2, 2) + pow(y2, 2));
-
-	scale = d / rho;
-
-}
-
-/**
- * Transforms a point in the geographic coordinate system to the local azimuthal equidistant plane
- * @param x north
- * @param y east
- * @param lat in degrees (47.1234567°, not 471234567°)
- * @param lon in degrees (8.1234567°, not 81234567°)
- */
-static void map_projection_project(double lat, double lon, float *x, float *y)
-{
-	/* notation and formulas accoring to: http://mathworld.wolfram.com/AzimuthalEquidistantProjection.html */
-	double phi = lat / 180.0 * M_PI;
-	double lambda = lon / 180.0 * M_PI;
-
-	double sin_phi = sin(phi);
-	double cos_phi = cos(phi);
-
-	double k_bar = 0;
-	/* using small angle approximation (formula in comment is without aproximation) */
-	double c =  acos(sin_phi_1 * sin_phi + cos_phi_1 * cos_phi * (1 - pow((lambda - lambda_0), 2) / 2)); //double c =  acos( sin_phi_1 * sin_phi + cos_phi_1 * cos_phi * cos(lambda - lambda_0) );
-
-	if (0 != c)
-		k_bar = c / sin(c);
-
-	/* using small angle approximation (formula in comment is without aproximation) */
-	*y = k_bar * (cos_phi * (lambda - lambda_0)) * scale;//*y = k_bar * (cos_phi * sin(lambda - lambda_0)) * scale;
-	*x = k_bar * ((cos_phi_1 * sin_phi - sin_phi_1 * cos_phi * (1 - pow((lambda - lambda_0), 2) / 2))) * scale; //	*x = k_bar * ((cos_phi_1 * sin_phi - sin_phi_1 * cos_phi * cos(lambda - lambda_0))) * scale;
-
-//	printf("%phi_1=%.10f, lambda_0 =%.10f\n", phi_1, lambda_0);
-}
-
-/**
- * Transforms a point in the local azimuthal equidistant plane to the geographic coordinate system
- *
- * @param x north
- * @param y east
- * @param lat in degrees (47.1234567°, not 471234567°)
- * @param lon in degrees (8.1234567°, not 81234567°)
- */
-static void map_projection_reproject(float x, float y, double *lat, double *lon)
-{
-	/* notation and formulas accoring to: http://mathworld.wolfram.com/AzimuthalEquidistantProjection.html */
-
-	double x_descaled = x / scale;
-	double y_descaled = y / scale;
-
-	double c = sqrt(pow(x_descaled, 2) + pow(y_descaled, 2));
-	double sin_c = sin(c);
-	double cos_c = cos(c);
-
-	double lat_sphere = 0;
-
-	if (c != 0)
-		lat_sphere = asin(cos_c * sin_phi_1 + (x_descaled * sin_c * cos_phi_1) / c);
-	else
-		lat_sphere = asin(cos_c * sin_phi_1);
-
-//	printf("lat_sphere = %.10f\n",lat_sphere);
-
-	double lon_sphere = 0;
-
-	if (phi_1  == M_PI / 2) {
-		//using small angle approximation (formula in comment is without aproximation)
-		lon_sphere = (lambda_0 - y_descaled / x_descaled); //lon_sphere = (lambda_0 + atan2(-y_descaled, x_descaled));
-
-	} else if (phi_1 == -M_PI / 2) {
-		//using small angle approximation (formula in comment is without aproximation)
-		lon_sphere = (lambda_0 + y_descaled / x_descaled); //lon_sphere = (lambda_0 + atan2(y_descaled, x_descaled));
-
-	} else {
-
-		lon_sphere = (lambda_0 + atan2(y_descaled * sin_c , c * cos_phi_1 * cos_c - x_descaled * sin_phi_1 * sin_c));
-		//using small angle approximation
-//    	double denominator = (c * cos_phi_1 * cos_c - x_descaled * sin_phi_1 * sin_c);
-//    	if(denominator != 0)
-//    	{
-//    		lon_sphere = (lambda_0 + (y_descaled * sin_c) / denominator);
-//    	}
-//    	else
-//    	{
-//    	...
-//    	}
-	}
-
-//	printf("lon_sphere = %.10f\n",lon_sphere);
-
-	*lat = lat_sphere * 180.0 / M_PI;
-	*lon = lon_sphere * 180.0 / M_PI;
-
-}
-
-/****************************************************************************
- * main
- ****************************************************************************/
-
-int position_estimator_main(int argc, char *argv[])
-{
-
-	/* welcome user */
-	printf("[multirotor position_estimator] started\n");
-
-	/* initialize values */
-	static float u[2] = {0, 0};
-	static float z[3] = {0, 0, 0};
-	static float xapo[N_STATES] = {0, 0, 0, 0, 0, 0};
-	static float Papo[N_STATES * N_STATES] = {ERROR_COVARIANCE_INIT, 0, 0, 0, 0, 0,
-			ERROR_COVARIANCE_INIT, 0, 0, 0, 0, 0,
-			ERROR_COVARIANCE_INIT, 0, 0, 0, 0, 0,
-			ERROR_COVARIANCE_INIT, 0, 0, 0, 0, 0,
-			ERROR_COVARIANCE_INIT, 0, 0, 0, 0, 0,
-			ERROR_COVARIANCE_INIT, 0, 0, 0, 0, 0
-						 };
-
-	static float xapo1[N_STATES];
-	static float Papo1[36];
-
-	static float gps_covariance[3] = {0.0f, 0.0f, 0.0f};
-
-	static uint16_t counter = 0;
-	position_estimator_counter_position_information = 0;
-
-	uint8_t predict_only = 1;
-
-	bool gps_valid = false;
-
-	bool new_initialization = true;
-
-	static double lat_current = 0.0d;//[°]] --> 47.0
-	static double lon_current = 0.0d; //[°]] -->8.5
-	float alt_current = 0.0f;
-
-
-	//TODO: handle flight without gps but with estimator
-
-	/* subscribe to vehicle status, attitude, gps */
-	struct vehicle_gps_position_s gps;
-	gps.fix_type = 0;
-	struct vehicle_status_s vstatus;
-	struct vehicle_attitude_s att;
-
-	int vehicle_gps_sub = orb_subscribe(ORB_ID(vehicle_gps_position));
-	int vehicle_status_sub = orb_subscribe(ORB_ID(vehicle_status));
-
-	/* subscribe to attitude at 100 Hz */
-	int vehicle_attitude_sub = orb_subscribe(ORB_ID(vehicle_attitude));
-
-	/* wait until gps signal turns valid, only then can we initialize the projection */
-	while (gps.fix_type < 3) {
-		struct pollfd fds[1] = { {.fd = vehicle_gps_sub, .events = POLLIN} };
-
-		/* wait for GPS updates, BUT READ VEHICLE STATUS (!)
-		 * this choice is critical, since the vehicle status might not
-		 * actually change, if this app is started after GPS lock was
-		 * aquired.
-		 */
-		if (poll(fds, 1, 5000)) {
-			/* Wait for the GPS update to propagate (we have some time) */
-			usleep(5000);
-			/* Read wether the vehicle status changed */
-			orb_copy(ORB_ID(vehicle_gps_position), vehicle_gps_sub, &gps);
-			gps_valid = (gps.fix_type > 2);
-		}
-	}
-
-	/* get gps value for first initialization */
-	orb_copy(ORB_ID(vehicle_gps_position), vehicle_gps_sub, &gps);
-	lat_current = ((double)(gps.lat)) * 1e-7;
-	lon_current = ((double)(gps.lon)) * 1e-7;
-	alt_current = gps.alt * 1e-3;
-
-	/* initialize coordinates */
-	map_projection_init(lat_current, lon_current);
-
-	/* publish global position messages only after first GPS message */
-	struct vehicle_local_position_s local_pos = {
-		.x = 0,
-		.y = 0,
-		.z = 0
-	};
-	orb_advert_t local_pos_pub = orb_advertise(ORB_ID(vehicle_local_position), &local_pos);
-
-	printf("[multirotor position estimator] initialized projection with: lat: %.10f,  lon:%.10f\n", lat_current, lon_current);
-
-	while (1) {
-
-		/*This runs at the rate of the sensors, if we have also a new gps update this is used in the position_estimator function */
-		struct pollfd fds[1] = { {.fd = vehicle_attitude_sub, .events = POLLIN} };
-
-		if (poll(fds, 1, 5000) <= 0) {
-			/* error / timeout */
-		} else {
-
-			orb_copy(ORB_ID(vehicle_attitude), vehicle_attitude_sub, &att);
-			/* got attitude, updating pos as well */
-			orb_copy(ORB_ID(vehicle_gps_position), vehicle_gps_sub, &gps);
-			orb_copy(ORB_ID(vehicle_status), vehicle_status_sub, &vstatus);
-
-			/*copy attitude */
-			u[0] = att.roll;
-			u[1] = att.pitch;
-
-			/* initialize map projection with the last estimate (not at full rate) */
-			if (gps.fix_type > 2) {
-				/* Project gps lat lon (Geographic coordinate system) to plane*/
-				map_projection_project(((double)(gps.lat)) * 1e-7, ((double)(gps.lon)) * 1e-7, &(z[0]), &(z[1]));
-
-				local_pos.x = z[0];
-				local_pos.y = z[1];
-				/* negative offset from initialization altitude */
-				local_pos.z = alt_current - (gps.alt) * 1e-3;
-
-
-				orb_publish(ORB_ID(vehicle_local_position), local_pos_pub, &local_pos);
-			}
-
-
-			// 	gps_covariance[0] = gps.eph; //TODO: needs scaling
-			// 	gps_covariance[1] = gps.eph;
-			// 	gps_covariance[2] = gps.epv;
-
-			// } else {
-			// 	/* we can not use the gps signal (it is of low quality) */
-			// 	predict_only = 1;
-			// }
-
-			// //		predict_only = 0;																//TODO: only for testing, removeme, XXX
-			// //		z[0] = sinf(((float)counter)/180.0f*3.14159265f);								//TODO: only for testing, removeme, XXX
-			// //		usleep(100000);																	//TODO: only for testing, removeme, XXX
-
-
-			// /*Get new estimation (this is calculated in the plane) */
-			// //TODO: if new_initialization == true: use 0,0,0, else use xapo
-			// if (true == new_initialization) {																								//TODO,XXX: uncomment!
-			// 	xapo[0] = 0; //we have a new plane initialization. the current estimate is in the center of the plane
-			// 	xapo[2] = 0;
-			// 	xapo[4] = 0;
-			// 	position_estimator(u, z, xapo, Papo, gps_covariance, predict_only, xapo1, Papo1);
-
-			// } else {
-			// 	position_estimator(u, z, xapo, Papo, gps_covariance, predict_only, xapo1, Papo1);
-			// }
-
-
-
-			// /* Copy values from xapo1 to xapo */
-			// int i;
-
-			// for (i = 0; i < N_STATES; i++) {
-			// 	xapo[i] = xapo1[i];
-			// }
-
-			// if ((counter % REPROJECTION_COUNTER_LIMIT == 0) || (counter % (PROJECTION_INITIALIZE_COUNTER_LIMIT - 1) == 0)) {
-			// 	/* Reproject from plane to geographic coordinate system */
-			// 	//		map_projection_reproject(xapo1[0], xapo1[2], map_scale, phi_1, lambda_0, &lat_current, &lon_current) //TODO,XXX: uncomment!
-			// 	map_projection_reproject(z[0], z[1], &lat_current, &lon_current); //do not use estimator for projection testing, removeme
-			// 	//		//DEBUG
-			// 	//			if(counter%500 == 0)
-			// 	//			{
-			// 	//				printf("phi_1: %.10f\n", phi_1);
-			// 	//				printf("lambda_0: %.10f\n", lambda_0);
-			// 	//				printf("lat_estimated: %.10f\n", lat_current);
-			// 	//				printf("lon_estimated: %.10f\n", lon_current);
-			// 	//				printf("z[0]=%.10f, z[1]=%.10f, z[2]=%f\n", z[0], z[1], z[2]);
-			// 	//				fflush(stdout);
-			// 	//
-			// 	//			}
-
-			// 	//			if(!isnan(lat_current) && !isnan(lon_current))// && !isnan(xapo1[4]) && !isnan(xapo1[1]) && !isnan(xapo1[3]) && !isnan(xapo1[5]))
-			// 	//			{
-			// 	/* send out */
-
-			// 	global_pos.lat = lat_current;
-			// 	global_pos.lon = lon_current;
-			// 	global_pos.alt = xapo1[4];
-			// 	global_pos.vx = xapo1[1];
-			// 	global_pos.vy = xapo1[3];
-			// 	global_pos.vz = xapo1[5];
-
-				/* publish current estimate */
-				// orb_publish(ORB_ID(vehicle_global_position), global_pos_pub, &global_pos);
-				//			}
-				//			else
-				//			{
-				//				printf("[position estimator] ERROR: nan values, lat_current=%.4f, lon_current=%.4f, z[0]=%.4f z[1]=%.4f\n", lat_current, lon_current, z[0], z[1]);
-				//				fflush(stdout);
-				//			}
-
-			// }
-
-			counter++;
-		}
-
-	}
-
-	return 0;
-}
-
-
diff --git a/src/modules/position_estimator_inav/inertial_filter.c b/src/modules/position_estimator_inav/inertial_filter.c
index 2f1b3c014..a36a4688d 100644
--- a/src/modules/position_estimator_inav/inertial_filter.c
+++ b/src/modules/position_estimator_inav/inertial_filter.c
@@ -9,15 +9,18 @@
 
 #include "inertial_filter.h"
 
-void inertial_filter_predict(float dt, float x[3])
+void inertial_filter_predict(float dt, float x[2], float acc)
 {
 	if (isfinite(dt)) {
-		x[0] += x[1] * dt + x[2] * dt * dt / 2.0f;
-		x[1] += x[2] * dt;
+		if (!isfinite(acc)) {
+			acc = 0.0f;
+		}
+		x[0] += x[1] * dt + acc * dt * dt / 2.0f;
+		x[1] += acc * dt;
 	}
 }
 
-void inertial_filter_correct(float e, float dt, float x[3], int i, float w)
+void inertial_filter_correct(float e, float dt, float x[2], int i, float w)
 {
 	if (isfinite(e) && isfinite(w) && isfinite(dt)) {
 		float ewdt = e * w * dt;
@@ -25,10 +28,6 @@ void inertial_filter_correct(float e, float dt, float x[3], int i, float w)
 
 		if (i == 0) {
 			x[1] += w * ewdt;
-			x[2] += w * w * ewdt / 3.0;
-
-		} else if (i == 1) {
-			x[2] += w * ewdt;
 		}
 	}
 }
diff --git a/src/modules/position_estimator_inav/inertial_filter.h b/src/modules/position_estimator_inav/inertial_filter.h
index 761c17097..cdeb4cfc6 100644
--- a/src/modules/position_estimator_inav/inertial_filter.h
+++ b/src/modules/position_estimator_inav/inertial_filter.h
@@ -8,6 +8,6 @@
 #include <stdbool.h>
 #include <drivers/drv_hrt.h>
 
-void inertial_filter_predict(float dt, float x[3]);
+void inertial_filter_predict(float dt, float x[3], float acc);
 
 void inertial_filter_correct(float e, float dt, float x[3], int i, float w);
diff --git a/src/modules/position_estimator_inav/module.mk b/src/modules/position_estimator_inav/module.mk
index 939d76849..0658d3f09 100644
--- a/src/modules/position_estimator_inav/module.mk
+++ b/src/modules/position_estimator_inav/module.mk
@@ -39,3 +39,5 @@ MODULE_COMMAND	 	= position_estimator_inav
 SRCS		 	= position_estimator_inav_main.c \
 			position_estimator_inav_params.c \
 			inertial_filter.c
+
+MODULE_STACKSIZE = 1200
diff --git a/src/modules/position_estimator_inav/position_estimator_inav_main.c b/src/modules/position_estimator_inav/position_estimator_inav_main.c
index 368fa6ee2..db1ce79ca 100644
--- a/src/modules/position_estimator_inav/position_estimator_inav_main.c
+++ b/src/modules/position_estimator_inav/position_estimator_inav_main.c
@@ -1,7 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2013 Anton Babushkin. All rights reserved.
- *   Author: 	Anton Babushkin	<rk3dov@gmail.com>
+ *   Copyright (C) 2013, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -35,6 +34,8 @@
 /**
  * @file position_estimator_inav_main.c
  * Model-identification based position estimator for multirotors
+ *
+ * @author Anton Babushkin <anton.babushkin@me.com>
  */
 
 #include <unistd.h>
@@ -48,6 +49,7 @@
 #include <sys/prctl.h>
 #include <termios.h>
 #include <math.h>
+#include <float.h>
 #include <uORB/uORB.h>
 #include <uORB/topics/parameter_update.h>
 #include <uORB/topics/actuator_controls.h>
@@ -57,6 +59,7 @@
 #include <uORB/topics/vehicle_local_position.h>
 #include <uORB/topics/vehicle_global_position.h>
 #include <uORB/topics/vehicle_gps_position.h>
+#include <uORB/topics/home_position.h>
 #include <uORB/topics/optical_flow.h>
 #include <mavlink/mavlink_log.h>
 #include <poll.h>
@@ -69,19 +72,20 @@
 #include "inertial_filter.h"
 
 #define MIN_VALID_W 0.00001f
+#define PUB_INTERVAL 10000	// limit publish rate to 100 Hz
+#define EST_BUF_SIZE 250000 / PUB_INTERVAL		// buffer size is 0.5s
 
 static bool thread_should_exit = false; /**< Deamon exit flag */
 static bool thread_running = false; /**< Deamon status flag */
 static int position_estimator_inav_task; /**< Handle of deamon task / thread */
 static bool verbose_mode = false;
 
-static const hrt_abstime gps_topic_timeout = 1000000;		// GPS topic timeout = 1s
+static const hrt_abstime gps_topic_timeout = 500000;		// GPS topic timeout = 0.5s
 static const hrt_abstime flow_topic_timeout = 1000000;	// optical flow topic timeout = 1s
 static const hrt_abstime sonar_timeout = 150000;	// sonar timeout = 150ms
 static const hrt_abstime sonar_valid_timeout = 1000000;	// estimate sonar distance during this time after sonar loss
 static const hrt_abstime xy_src_timeout = 2000000;	// estimate position during this time after position sources loss
 static const uint32_t updates_counter_len = 1000000;
-static const uint32_t pub_interval = 10000;	// limit publish rate to 100 Hz
 static const float max_flow = 1.0f;	// max flow value that can be used, rad/s
 
 __EXPORT int position_estimator_inav_main(int argc, char *argv[]);
@@ -90,13 +94,24 @@ int position_estimator_inav_thread_main(int argc, char *argv[]);
 
 static void usage(const char *reason);
 
+static inline int min(int val1, int val2)
+{
+	return (val1 < val2) ? val1 : val2;
+}
+
+static inline int max(int val1, int val2)
+{
+	return (val1 > val2) ? val1 : val2;
+}
+
 /**
  * Print the correct usage.
  */
 static void usage(const char *reason)
 {
-	if (reason)
+	if (reason) {
 		fprintf(stderr, "%s\n", reason);
+	}
 
 	fprintf(stderr, "usage: position_estimator_inav {start|stop|status} [-v]\n\n");
 	exit(1);
@@ -112,8 +127,9 @@ static void usage(const char *reason)
  */
 int position_estimator_inav_main(int argc, char *argv[])
 {
-	if (argc < 1)
+	if (argc < 1) {
 		usage("missing command");
+	}
 
 	if (!strcmp(argv[1], "start")) {
 		if (thread_running) {
@@ -125,12 +141,13 @@ int position_estimator_inav_main(int argc, char *argv[])
 		verbose_mode = false;
 
 		if (argc > 1)
-			if (!strcmp(argv[2], "-v"))
+			if (!strcmp(argv[2], "-v")) {
 				verbose_mode = true;
+			}
 
 		thread_should_exit = false;
 		position_estimator_inav_task = task_spawn_cmd("position_estimator_inav",
-					       SCHED_RR, SCHED_PRIORITY_MAX - 5, 4096,
+					       SCHED_DEFAULT, SCHED_PRIORITY_MAX - 5, 5000,
 					       position_estimator_inav_thread_main,
 					       (argv) ? (const char **) &argv[2] : (const char **) NULL);
 		exit(0);
@@ -163,16 +180,25 @@ int position_estimator_inav_main(int argc, char *argv[])
 	exit(1);
 }
 
-void write_debug_log(const char *msg, float dt, float x_est[3], float y_est[3], float z_est[3], float corr_acc[3], float corr_gps[3][2], float w_xy_gps_p, float w_xy_gps_v) {
+static void write_debug_log(const char *msg, float dt, float x_est[2], float y_est[2], float z_est[2], float x_est_prev[2], float y_est_prev[2], float z_est_prev[2], float acc[3], float corr_gps[3][2], float w_xy_gps_p, float w_xy_gps_v)
+{
 	FILE *f = fopen("/fs/microsd/inav.log", "a");
+
 	if (f) {
 		char *s = malloc(256);
-		unsigned n = snprintf(s, 256, "%llu %s\n\tdt=%.5f x_est=[%.5f %.5f %.5f] y_est=[%.5f %.5f %.5f] z_est=[%.5f %.5f %.5f]\n", hrt_absolute_time(), msg, dt, x_est[0], x_est[1], x_est[2], y_est[0], y_est[1], y_est[2], z_est[0], z_est[1], z_est[2]);
+		unsigned n = snprintf(s, 256, "%llu %s\n\tdt=%.5f x_est=[%.5f %.5f] y_est=[%.5f %.5f] z_est=[%.5f %.5f] x_est_prev=[%.5f %.5f] y_est_prev=[%.5f %.5f] z_est_prev=[%.5f %.5f]\n",
+                              hrt_absolute_time(), msg, (double)dt,
+                              (double)x_est[0], (double)x_est[1], (double)y_est[0], (double)y_est[1], (double)z_est[0], (double)z_est[1],
+                              (double)x_est_prev[0], (double)x_est_prev[1], (double)y_est_prev[0], (double)y_est_prev[1], (double)z_est_prev[0], (double)z_est_prev[1]);
 		fwrite(s, 1, n, f);
-		n = snprintf(s, 256, "\tacc_corr=[%.5f %.5f %.5f] gps_pos_corr=[%.5f %.5f %.5f] gps_vel_corr=[%.5f %.5f %.5f] w_xy_gps_p=%.5f w_xy_gps_v=%.5f\n", corr_acc[0], corr_acc[1], corr_acc[2], corr_gps[0][0], corr_gps[1][0], corr_gps[2][0], corr_gps[0][1], corr_gps[1][1], corr_gps[2][1], w_xy_gps_p, w_xy_gps_v);
+		n = snprintf(s, 256, "\tacc=[%.5f %.5f %.5f] gps_pos_corr=[%.5f %.5f %.5f] gps_vel_corr=[%.5f %.5f %.5f] w_xy_gps_p=%.5f w_xy_gps_v=%.5f\n",
+                     (double)acc[0], (double)acc[1], (double)acc[2],
+                     (double)corr_gps[0][0], (double)corr_gps[1][0], (double)corr_gps[2][0], (double)corr_gps[0][1], (double)corr_gps[1][1], (double)corr_gps[2][1],
+                     (double)w_xy_gps_p, (double)w_xy_gps_v);
 		fwrite(s, 1, n, f);
 		free(s);
 	}
+
 	fsync(fileno(f));
 	fclose(f);
 }
@@ -187,9 +213,30 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 	mavlink_fd = open(MAVLINK_LOG_DEVICE, 0);
 	mavlink_log_info(mavlink_fd, "[inav] started");
 
-	float x_est[3] = { 0.0f, 0.0f, 0.0f };
-	float y_est[3] = { 0.0f, 0.0f, 0.0f };
-	float z_est[3] = { 0.0f, 0.0f, 0.0f };
+	float x_est[2] = { 0.0f, 0.0f };	// pos, vel
+	float y_est[2] = { 0.0f, 0.0f };	// pos, vel
+	float z_est[2] = { 0.0f, 0.0f };	// pos, vel
+
+	float est_buf[EST_BUF_SIZE][3][2];	// estimated position buffer
+	float R_buf[EST_BUF_SIZE][3][3];	// rotation matrix buffer
+	float R_gps[3][3];					// rotation matrix for GPS correction moment
+	memset(est_buf, 0, sizeof(est_buf));
+	memset(R_buf, 0, sizeof(R_buf));
+	memset(R_gps, 0, sizeof(R_gps));
+	int buf_ptr = 0;
+
+	static const float min_eph_epv = 2.0f;	// min EPH/EPV, used for weight calculation
+	static const float max_eph_epv = 20.0f;	// max EPH/EPV acceptable for estimation
+
+	float eph = max_eph_epv;
+	float epv = 1.0f;
+
+	float eph_flow = 1.0f;
+
+	float x_est_prev[2], y_est_prev[2], z_est_prev[2];
+	memset(x_est_prev, 0, sizeof(x_est_prev));
+	memset(y_est_prev, 0, sizeof(y_est_prev));
+	memset(z_est_prev, 0, sizeof(z_est_prev));
 
 	int baro_init_cnt = 0;
 	int baro_init_num = 200;
@@ -206,6 +253,9 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 	bool ref_inited = false;
 	hrt_abstime ref_init_start = 0;
 	const hrt_abstime ref_init_delay = 1000000;	// wait for 1s after 3D fix
+	struct map_projection_reference_s ref;
+	memset(&ref, 0, sizeof(ref));
+	hrt_abstime home_timestamp = 0;
 
 	uint16_t accel_updates = 0;
 	uint16_t baro_updates = 0;
@@ -218,11 +268,8 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 
 	hrt_abstime t_prev = 0;
 
-	/* acceleration in NED frame */
-	float accel_NED[3] = { 0.0f, 0.0f, -CONSTANTS_ONE_G };
-
 	/* store error when sensor updates, but correct on each time step to avoid jumps in estimated value */
-	float corr_acc[] = { 0.0f, 0.0f, 0.0f };	// N E D
+	float acc[] = { 0.0f, 0.0f, 0.0f };	// N E D
 	float acc_bias[] = { 0.0f, 0.0f, 0.0f };	// body frame
 	float corr_baro = 0.0f;		// D
 	float corr_gps[3][2] = {
@@ -239,9 +286,9 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 	float w_flow = 0.0f;
 
 	float sonar_prev = 0.0f;
+	hrt_abstime flow_prev = 0;			// time of last flow measurement
 	hrt_abstime sonar_time = 0;			// time of last sonar measurement (not filtered)
 	hrt_abstime sonar_valid_time = 0;	// time of last sonar measurement used for correction (filtered)
-	hrt_abstime xy_src_time = 0;		// time of last available position data
 
 	bool gps_valid = false;			// GPS is valid
 	bool sonar_valid = false;		// sonar is valid
@@ -257,6 +304,8 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 	memset(&sensor, 0, sizeof(sensor));
 	struct vehicle_gps_position_s gps;
 	memset(&gps, 0, sizeof(gps));
+	struct home_position_s home;
+	memset(&home, 0, sizeof(home));
 	struct vehicle_attitude_s att;
 	memset(&att, 0, sizeof(att));
 	struct vehicle_local_position_s local_pos;
@@ -274,10 +323,11 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 	int vehicle_attitude_sub = orb_subscribe(ORB_ID(vehicle_attitude));
 	int optical_flow_sub = orb_subscribe(ORB_ID(optical_flow));
 	int vehicle_gps_position_sub = orb_subscribe(ORB_ID(vehicle_gps_position));
+	int home_position_sub = orb_subscribe(ORB_ID(home_position));
 
 	/* advertise */
 	orb_advert_t vehicle_local_position_pub = orb_advertise(ORB_ID(vehicle_local_position), &local_pos);
-	orb_advert_t vehicle_global_position_pub = orb_advertise(ORB_ID(vehicle_global_position), &global_pos);
+	orb_advert_t vehicle_global_position_pub = -1;
 
 	struct position_estimator_inav_params params;
 	struct position_estimator_inav_param_handles pos_inav_param_handles;
@@ -315,17 +365,18 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 
 					/* mean calculation over several measurements */
 					if (baro_init_cnt < baro_init_num) {
-						baro_offset += sensor.baro_alt_meter;
-						baro_init_cnt++;
+						if (isfinite(sensor.baro_alt_meter)) {
+							baro_offset += sensor.baro_alt_meter;
+							baro_init_cnt++;
+						}
 
 					} else {
 						wait_baro = false;
 						baro_offset /= (float) baro_init_cnt;
-						warnx("baro offs: %.2f", baro_offset);
-						mavlink_log_info(mavlink_fd, "[inav] baro offs: %.2f", baro_offset);
+						warnx("baro offs: %.2f", (double)baro_offset);
+						mavlink_log_info(mavlink_fd, "[inav] baro offs: %.2f", (double)baro_offset);
 						local_pos.z_valid = true;
 						local_pos.v_z_valid = true;
-						global_pos.baro_valid = true;
 					}
 				}
 			}
@@ -393,19 +444,17 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 
 						/* transform acceleration vector from body frame to NED frame */
 						for (int i = 0; i < 3; i++) {
-							accel_NED[i] = 0.0f;
+							acc[i] = 0.0f;
 
 							for (int j = 0; j < 3; j++) {
-								accel_NED[i] += att.R[i][j] * sensor.accelerometer_m_s2[j];
+								acc[i] += att.R[i][j] * sensor.accelerometer_m_s2[j];
 							}
 						}
 
-						corr_acc[0] = accel_NED[0] - x_est[2];
-						corr_acc[1] = accel_NED[1] - y_est[2];
-						corr_acc[2] = accel_NED[2] + CONSTANTS_ONE_G - z_est[2];
+						acc[2] += CONSTANTS_ONE_G;
 
 					} else {
-						memset(corr_acc, 0, sizeof(corr_acc));
+						memset(acc, 0, sizeof(acc));
 					}
 
 					accel_timestamp = sensor.accelerometer_timestamp;
@@ -425,7 +474,15 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 			if (updated) {
 				orb_copy(ORB_ID(optical_flow), optical_flow_sub, &flow);
 
-				if (flow.ground_distance_m > 0.31f && flow.ground_distance_m < 4.0f && att.R[2][2] > 0.7 && flow.ground_distance_m != sonar_prev) {
+				/* calculate time from previous update */
+				float flow_dt = flow_prev > 0 ? (flow.flow_timestamp - flow_prev) * 1e-6f : 0.1f;
+				flow_prev = flow.flow_timestamp;
+
+				if ((flow.ground_distance_m > 0.31f) &&
+					(flow.ground_distance_m < 4.0f) &&
+					(att.R[2][2] > 0.7f) &&
+					(fabsf(flow.ground_distance_m - sonar_prev) > FLT_EPSILON)) {
+
 					sonar_time = t;
 					sonar_prev = flow.ground_distance_m;
 					corr_sonar = flow.ground_distance_m + surface_offset + z_est[0];
@@ -447,7 +504,7 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 							sonar_valid_time = t;
 							sonar_valid = true;
 							local_pos.surface_bottom_timestamp = t;
-							mavlink_log_info(mavlink_fd, "[inav] new surface level: %.2f", surface_offset);
+							mavlink_log_info(mavlink_fd, "[inav] new surface level: %.2f", (double)surface_offset);
 						}
 
 					} else {
@@ -460,7 +517,7 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 				float flow_q = flow.quality / 255.0f;
 				float dist_bottom = - z_est[0] - surface_offset;
 
-				if (dist_bottom > 0.3f && flow_q > params.flow_q_min && (t < sonar_valid_time + sonar_valid_timeout) && att.R[2][2] > 0.7) {
+				if (dist_bottom > 0.3f && flow_q > params.flow_q_min && (t < sonar_valid_time + sonar_valid_timeout) && att.R[2][2] > 0.7f) {
 					/* distance to surface */
 					float flow_dist = dist_bottom / att.R[2][2];
 					/* check if flow if too large for accurate measurements */
@@ -475,10 +532,10 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 					flow_accurate = fabsf(body_v_est[1] / flow_dist - att.rollspeed) < max_flow &&
 							fabsf(body_v_est[0] / flow_dist + att.pitchspeed) < max_flow;
 
-					/* convert raw flow to angular flow */
+					/* convert raw flow to angular flow (rad/s) */
 					float flow_ang[2];
-					flow_ang[0] = flow.flow_raw_x * params.flow_k;
-					flow_ang[1] = flow.flow_raw_y * params.flow_k;
+					flow_ang[0] = flow.flow_raw_x * params.flow_k / 1000.0f / flow_dt;
+					flow_ang[1] = flow.flow_raw_y * params.flow_k / 1000.0f / flow_dt;
 					/* flow measurements vector */
 					float flow_m[3];
 					flow_m[0] = -flow_ang[0] * flow_dist;
@@ -503,8 +560,12 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 
 					/* if flow is not accurate, reduce weight for it */
 					// TODO make this more fuzzy
-					if (!flow_accurate)
+					if (!flow_accurate) {
 						w_flow *= 0.05f;
+					}
+
+					/* under ideal conditions, on 1m distance assume EPH = 10cm */
+					eph_flow = 0.1f / w_flow;
 
 					flow_valid = true;
 
@@ -516,32 +577,73 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 				flow_updates++;
 			}
 
+			/* home position */
+			orb_check(home_position_sub, &updated);
+
+			if (updated) {
+				orb_copy(ORB_ID(home_position), home_position_sub, &home);
+
+				if (home.timestamp != home_timestamp) {
+					home_timestamp = home.timestamp;
+
+					double est_lat, est_lon;
+					float est_alt;
+
+					if (ref_inited) {
+						/* calculate current estimated position in global frame */
+						est_alt = local_pos.ref_alt - local_pos.z;
+						map_projection_reproject(&ref, local_pos.x, local_pos.y, &est_lat, &est_lon);
+					}
+
+					/* update reference */
+					map_projection_init(&ref, home.lat, home.lon);
+
+					/* update baro offset */
+					baro_offset += home.alt - local_pos.ref_alt;
+
+					local_pos.ref_lat = home.lat;
+					local_pos.ref_lon = home.lon;
+					local_pos.ref_alt = home.alt;
+					local_pos.ref_timestamp = home.timestamp;
+
+					if (ref_inited) {
+						/* reproject position estimate with new reference */
+						map_projection_project(&ref, est_lat, est_lon, &x_est[0], &y_est[0]);
+						z_est[0] = -(est_alt - local_pos.ref_alt);
+					}
+
+					ref_inited = true;
+				}
+			}
+
 			/* vehicle GPS position */
 			orb_check(vehicle_gps_position_sub, &updated);
 
 			if (updated) {
 				orb_copy(ORB_ID(vehicle_gps_position), vehicle_gps_position_sub, &gps);
 
-				if (gps.fix_type >= 3) {
-					/* hysteresis for GPS quality */
-					if (gps_valid) {
-						if (gps.eph_m > 10.0f || gps.epv_m > 20.0f) {
-							gps_valid = false;
-							mavlink_log_info(mavlink_fd, "[inav] GPS signal lost");
-						}
+				bool reset_est = false;
 
-					} else {
-						if (gps.eph_m < 5.0f && gps.epv_m < 10.0f) {
-							gps_valid = true;
-							mavlink_log_info(mavlink_fd, "[inav] GPS signal found");
-						}
+				/* hysteresis for GPS quality */
+				if (gps_valid) {
+					if (gps.eph > max_eph_epv || gps.epv > max_eph_epv || gps.fix_type < 3) {
+						gps_valid = false;
+						mavlink_log_info(mavlink_fd, "[inav] GPS signal lost");
 					}
 
 				} else {
-					gps_valid = false;
+					if (gps.eph < max_eph_epv * 0.7f && gps.epv < max_eph_epv * 0.7f && gps.fix_type >= 3) {
+						gps_valid = true;
+						reset_est = true;
+						mavlink_log_info(mavlink_fd, "[inav] GPS signal found");
+					}
 				}
 
 				if (gps_valid) {
+					double lat = gps.lat * 1e-7;
+					double lon = gps.lon * 1e-7;
+					float alt = gps.alt * 1e-3;
+
 					/* initialize reference position if needed */
 					if (!ref_inited) {
 						if (ref_init_start == 0) {
@@ -549,37 +651,54 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 
 						} else if (t > ref_init_start + ref_init_delay) {
 							ref_inited = true;
-							/* reference GPS position */
-							double lat = gps.lat * 1e-7;
-							double lon = gps.lon * 1e-7;
-							float alt = gps.alt * 1e-3;
 
-							local_pos.ref_lat = gps.lat;
-							local_pos.ref_lon = gps.lon;
+							/* set position estimate to (0, 0, 0), use GPS velocity for XY */
+							x_est[0] = 0.0f;
+							x_est[1] = gps.vel_n_m_s;
+							y_est[0] = 0.0f;
+							y_est[1] = gps.vel_e_m_s;
+
+							local_pos.ref_lat = lat;
+							local_pos.ref_lon = lon;
 							local_pos.ref_alt = alt + z_est[0];
 							local_pos.ref_timestamp = t;
 
 							/* initialize projection */
-							map_projection_init(lat, lon);
-							warnx("init ref: lat=%.7f, lon=%.7f, alt=%.2f", lat, lon, alt);
-							mavlink_log_info(mavlink_fd, "[inav] init ref: lat=%.7f, lon=%.7f, alt=%.2f", lat, lon, alt);
+							map_projection_init(&ref, lat, lon);
+							warnx("init ref: lat=%.7f, lon=%.7f, alt=%.2f", (double)lat, (double)lon, (double)alt);
+							mavlink_log_info(mavlink_fd, "[inav] init ref: %.7f, %.7f, %.2f", (double)lat, (double)lon, (double)alt);
 						}
 					}
 
 					if (ref_inited) {
 						/* project GPS lat lon to plane */
 						float gps_proj[2];
-						map_projection_project(gps.lat * 1e-7, gps.lon * 1e-7, &(gps_proj[0]), &(gps_proj[1]));
+						map_projection_project(&ref, lat, lon, &(gps_proj[0]), &(gps_proj[1]));
+
+						/* reset position estimate when GPS becomes good */
+						if (reset_est) {
+							x_est[0] = gps_proj[0];
+							x_est[1] = gps.vel_n_m_s;
+							y_est[0] = gps_proj[1];
+							y_est[1] = gps.vel_e_m_s;
+						}
+
+						/* calculate index of estimated values in buffer */
+						int est_i = buf_ptr - 1 - min(EST_BUF_SIZE - 1, max(0, (int)(params.delay_gps * 1000000.0f / PUB_INTERVAL)));
+						if (est_i < 0) {
+							est_i += EST_BUF_SIZE;
+						}
+
 						/* calculate correction for position */
-						corr_gps[0][0] = gps_proj[0] - x_est[0];
-						corr_gps[1][0] = gps_proj[1] - y_est[0];
-						corr_gps[2][0] = local_pos.ref_alt - gps.alt * 1e-3 - z_est[0];
+						corr_gps[0][0] = gps_proj[0] - est_buf[est_i][0][0];
+						corr_gps[1][0] = gps_proj[1] - est_buf[est_i][1][0];
+						corr_gps[2][0] = local_pos.ref_alt - alt - est_buf[est_i][2][0];
 
 						/* calculate correction for velocity */
 						if (gps.vel_ned_valid) {
-							corr_gps[0][1] = gps.vel_n_m_s - x_est[1];
-							corr_gps[1][1] = gps.vel_e_m_s - y_est[1];
-							corr_gps[2][1] = gps.vel_d_m_s - z_est[1];
+							corr_gps[0][1] = gps.vel_n_m_s - est_buf[est_i][0][1];
+							corr_gps[1][1] = gps.vel_e_m_s - est_buf[est_i][1][1];
+							corr_gps[2][1] = gps.vel_d_m_s - est_buf[est_i][2][1];
 
 						} else {
 							corr_gps[0][1] = 0.0f;
@@ -587,8 +706,11 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 							corr_gps[2][1] = 0.0f;
 						}
 
-						w_gps_xy = 2.0f / fmaxf(2.0f, gps.eph_m);
-						w_gps_z = 4.0f / fmaxf(4.0f, gps.epv_m);
+						/* save rotation matrix at this moment */
+						memcpy(R_gps, R_buf[est_i], sizeof(R_gps));
+
+						w_gps_xy = min_eph_epv / fmaxf(min_eph_epv, gps.eph);
+						w_gps_z = min_eph_epv / fmaxf(min_eph_epv, gps.epv);
 					}
 
 				} else {
@@ -626,18 +748,21 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 		dt = fmaxf(fminf(0.02, dt), 0.002);		// constrain dt from 2 to 20 ms
 		t_prev = t;
 
+		/* increase EPH/EPV on each step */
+		if (eph < max_eph_epv) {
+			eph *= 1.0f + dt;
+		}
+		if (epv < max_eph_epv) {
+			epv += 0.005f * dt;	// add 1m to EPV each 200s (baro drift)
+		}
+
 		/* use GPS if it's valid and reference position initialized */
 		bool use_gps_xy = ref_inited && gps_valid && params.w_xy_gps_p > MIN_VALID_W;
 		bool use_gps_z = ref_inited && gps_valid && params.w_z_gps_p > MIN_VALID_W;
 		/* use flow if it's valid and (accurate or no GPS available) */
 		bool use_flow = flow_valid && (flow_accurate || !use_gps_xy);
 
-		/* try to estimate position during some time after position sources lost */
-		if (use_gps_xy || use_flow) {
-			xy_src_time = t;
-		}
-
-		bool can_estimate_xy = (t < xy_src_time + xy_src_timeout);
+		bool can_estimate_xy = (eph < max_eph_epv) || use_gps_xy || use_flow;
 
 		bool dist_bottom_valid = (t < sonar_valid_time + sonar_valid_timeout);
 
@@ -669,7 +794,7 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 			corr_baro += offs_corr;
 		}
 
-		/* accelerometer bias correction */
+		/* accelerometer bias correction for GPS (use buffered rotation matrix) */
 		float accel_bias_corr[3] = { 0.0f, 0.0f, 0.0f };
 
 		if (use_gps_xy) {
@@ -683,6 +808,24 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 			accel_bias_corr[2] -= corr_gps[2][0] * w_z_gps_p * w_z_gps_p;
 		}
 
+		/* transform error vector from NED frame to body frame */
+		for (int i = 0; i < 3; i++) {
+			float c = 0.0f;
+
+			for (int j = 0; j < 3; j++) {
+				c += R_gps[j][i] * accel_bias_corr[j];
+			}
+
+			if (isfinite(c)) {
+				acc_bias[i] += c * params.w_acc_bias * dt;
+			}
+		}
+
+		/* accelerometer bias correction for flow and baro (assume that there is no delay) */
+		accel_bias_corr[0] = 0.0f;
+		accel_bias_corr[1] = 0.0f;
+		accel_bias_corr[2] = 0.0f;
+
 		if (use_flow) {
 			accel_bias_corr[0] -= corr_flow[0] * params.w_xy_flow;
 			accel_bias_corr[1] -= corr_flow[1] * params.w_xy_flow;
@@ -698,43 +841,60 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 				c += att.R[j][i] * accel_bias_corr[j];
 			}
 
-			acc_bias[i] += c * params.w_acc_bias * dt;
+			if (isfinite(c)) {
+				acc_bias[i] += c * params.w_acc_bias * dt;
+			}
 		}
 
 		/* inertial filter prediction for altitude */
-		inertial_filter_predict(dt, z_est);
+		inertial_filter_predict(dt, z_est, acc[2]);
+
+		if (!(isfinite(z_est[0]) && isfinite(z_est[1]))) {
+			write_debug_log("BAD ESTIMATE AFTER Z PREDICTION", dt, x_est, y_est, z_est, x_est_prev, y_est_prev, z_est_prev, acc, corr_gps, w_xy_gps_p, w_xy_gps_v);
+			memcpy(z_est, z_est_prev, sizeof(z_est));
+		}
 
 		/* inertial filter correction for altitude */
 		inertial_filter_correct(corr_baro, dt, z_est, 0, params.w_z_baro);
-		inertial_filter_correct(corr_gps[2][0], dt, z_est, 0, w_z_gps_p);
-		inertial_filter_correct(corr_acc[2], dt, z_est, 2, params.w_z_acc);
 
-		float x_est_prev[3], y_est_prev[3];
+		if (use_gps_z) {
+			epv = fminf(epv, gps.epv);
 
-		memcpy(x_est_prev, x_est, sizeof(x_est));
-		memcpy(y_est_prev, y_est, sizeof(y_est));
+			inertial_filter_correct(corr_gps[2][0], dt, z_est, 0, w_z_gps_p);
+		}
+
+		if (!(isfinite(z_est[0]) && isfinite(z_est[1]))) {
+			write_debug_log("BAD ESTIMATE AFTER Z CORRECTION", dt, x_est, y_est, z_est, x_est_prev, y_est_prev, z_est_prev, acc, corr_gps, w_xy_gps_p, w_xy_gps_v);
+			memcpy(z_est, z_est_prev, sizeof(z_est));
+			memset(corr_gps, 0, sizeof(corr_gps));
+			corr_baro = 0;
+
+		} else {
+			memcpy(z_est_prev, z_est, sizeof(z_est));
+		}
 
 		if (can_estimate_xy) {
 			/* inertial filter prediction for position */
-			inertial_filter_predict(dt, x_est);
-			inertial_filter_predict(dt, y_est);
+			inertial_filter_predict(dt, x_est, acc[0]);
+			inertial_filter_predict(dt, y_est, acc[1]);
 
-			if (!isfinite(x_est[0]) || !isfinite(y_est[0])) {
-				write_debug_log("BAD ESTIMATE AFTER PREDICTION", dt, x_est, y_est, z_est, corr_acc, corr_gps, w_xy_gps_p, w_xy_gps_v);
+			if (!(isfinite(x_est[0]) && isfinite(x_est[1]) && isfinite(y_est[0]) && isfinite(y_est[1]))) {
+				write_debug_log("BAD ESTIMATE AFTER PREDICTION", dt, x_est, y_est, z_est, x_est_prev, y_est_prev, z_est_prev, acc, corr_gps, w_xy_gps_p, w_xy_gps_v);
 				memcpy(x_est, x_est_prev, sizeof(x_est));
 				memcpy(y_est, y_est_prev, sizeof(y_est));
 			}
 
 			/* inertial filter correction for position */
-			inertial_filter_correct(corr_acc[0], dt, x_est, 2, params.w_xy_acc);
-			inertial_filter_correct(corr_acc[1], dt, y_est, 2, params.w_xy_acc);
-
 			if (use_flow) {
+				eph = fminf(eph, eph_flow);
+
 				inertial_filter_correct(corr_flow[0], dt, x_est, 1, params.w_xy_flow * w_flow);
 				inertial_filter_correct(corr_flow[1], dt, y_est, 1, params.w_xy_flow * w_flow);
 			}
 
 			if (use_gps_xy) {
+				eph = fminf(eph, gps.eph);
+
 				inertial_filter_correct(corr_gps[0][0], dt, x_est, 0, w_xy_gps_p);
 				inertial_filter_correct(corr_gps[1][0], dt, y_est, 0, w_xy_gps_p);
 
@@ -744,13 +904,16 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 				}
 			}
 
-			if (!isfinite(x_est[0]) || !isfinite(y_est[0])) {
-				write_debug_log("BAD ESTIMATE AFTER CORRECTION", dt, x_est, y_est, z_est, corr_acc, corr_gps, w_xy_gps_p, w_xy_gps_v);
+			if (!(isfinite(x_est[0]) && isfinite(x_est[1]) && isfinite(y_est[0]) && isfinite(y_est[1]))) {
+				write_debug_log("BAD ESTIMATE AFTER CORRECTION", dt, x_est, y_est, z_est, x_est_prev, y_est_prev, z_est_prev, acc, corr_gps, w_xy_gps_p, w_xy_gps_v);
 				memcpy(x_est, x_est_prev, sizeof(x_est));
 				memcpy(y_est, y_est_prev, sizeof(y_est));
-				memset(corr_acc, 0, sizeof(corr_acc));
 				memset(corr_gps, 0, sizeof(corr_gps));
 				memset(corr_flow, 0, sizeof(corr_flow));
+
+			} else {
+				memcpy(x_est_prev, x_est, sizeof(x_est));
+				memcpy(y_est_prev, y_est, sizeof(y_est));
 			}
 		}
 
@@ -763,7 +926,7 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 		float thrust = armed.armed ? actuator.control[3] : 0.0f;
 
 		if (landed) {
-			if (alt_disp2 > land_disp2 && thrust > params.land_thr) {
+			if (alt_disp2 > land_disp2 || thrust > params.land_thr) {
 				landed = false;
 				landed_time = 0;
 			}
@@ -791,11 +954,11 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 				float updates_dt = (t - updates_counter_start) * 0.000001f;
 				warnx(
 					"updates rate: accelerometer = %.1f/s, baro = %.1f/s, gps = %.1f/s, attitude = %.1f/s, flow = %.1f/s",
-					accel_updates / updates_dt,
-					baro_updates / updates_dt,
-					gps_updates / updates_dt,
-					attitude_updates / updates_dt,
-					flow_updates / updates_dt);
+					(double)(accel_updates / updates_dt),
+					(double)(baro_updates / updates_dt),
+					(double)(gps_updates / updates_dt),
+					(double)(attitude_updates / updates_dt),
+					(double)(flow_updates / updates_dt));
 				updates_counter_start = t;
 				accel_updates = 0;
 				baro_updates = 0;
@@ -805,10 +968,27 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 			}
 		}
 
-		if (t > pub_last + pub_interval) {
+		if (t > pub_last + PUB_INTERVAL) {
 			pub_last = t;
+
+			/* push current estimate to buffer */
+			est_buf[buf_ptr][0][0] = x_est[0];
+			est_buf[buf_ptr][0][1] = x_est[1];
+			est_buf[buf_ptr][1][0] = y_est[0];
+			est_buf[buf_ptr][1][1] = y_est[1];
+			est_buf[buf_ptr][2][0] = z_est[0];
+			est_buf[buf_ptr][2][1] = z_est[1];
+
+			/* push current rotation matrix to buffer */
+			memcpy(R_buf[buf_ptr], att.R, sizeof(att.R));
+
+			buf_ptr++;
+			if (buf_ptr >= EST_BUF_SIZE) {
+				buf_ptr = 0;
+			}
+
 			/* publish local position */
-			local_pos.xy_valid = can_estimate_xy && use_gps_xy;
+			local_pos.xy_valid = can_estimate_xy;
 			local_pos.v_xy_valid = can_estimate_xy;
 			local_pos.xy_global = local_pos.xy_valid && use_gps_xy;
 			local_pos.z_global = local_pos.z_valid && use_gps_z;
@@ -821,6 +1001,8 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 			local_pos.landed = landed;
 			local_pos.yaw = att.yaw;
 			local_pos.dist_bottom_valid = dist_bottom_valid;
+			local_pos.eph = eph;
+			local_pos.epv = epv;
 
 			if (local_pos.dist_bottom_valid) {
 				local_pos.dist_bottom = -z_est[0] - surface_offset;
@@ -831,40 +1013,34 @@ int position_estimator_inav_thread_main(int argc, char *argv[])
 
 			orb_publish(ORB_ID(vehicle_local_position), vehicle_local_position_pub, &local_pos);
 
-			/* publish global position */
-			global_pos.global_valid = local_pos.xy_global;
+			if (local_pos.xy_global && local_pos.z_global) {
+				/* publish global position */
+				global_pos.timestamp = t;
+				global_pos.time_gps_usec = gps.time_gps_usec;
 
-			if (local_pos.xy_global) {
 				double est_lat, est_lon;
-				map_projection_reproject(local_pos.x, local_pos.y, &est_lat, &est_lon);
+				map_projection_reproject(&ref, local_pos.x, local_pos.y, &est_lat, &est_lon);
+
 				global_pos.lat = est_lat;
 				global_pos.lon = est_lon;
-				global_pos.time_gps_usec = gps.time_gps_usec;
-			}
+				global_pos.alt = local_pos.ref_alt - local_pos.z;
 
-			/* set valid values even if position is not valid */
-			if (local_pos.v_xy_valid) {
 				global_pos.vel_n = local_pos.vx;
 				global_pos.vel_e = local_pos.vy;
-			}
-
-			if (local_pos.z_global) {
-				global_pos.alt = local_pos.ref_alt - local_pos.z;
-			}
-
-			if (local_pos.z_valid) {
-				global_pos.baro_alt = baro_offset - local_pos.z;
-			}
-
-			if (local_pos.v_z_valid) {
 				global_pos.vel_d = local_pos.vz;
-			}
 
-			global_pos.yaw = local_pos.yaw;
+				global_pos.yaw = local_pos.yaw;
+
+				global_pos.eph = eph;
+				global_pos.epv = epv;
 
-			global_pos.timestamp = t;
+				if (vehicle_global_position_pub < 0) {
+					vehicle_global_position_pub = orb_advertise(ORB_ID(vehicle_global_position), &global_pos);
 
-			orb_publish(ORB_ID(vehicle_global_position), vehicle_global_position_pub, &global_pos);
+				} else {
+					orb_publish(ORB_ID(vehicle_global_position), vehicle_global_position_pub, &global_pos);
+				}
+			}
 		}
 	}
 
diff --git a/src/modules/position_estimator_inav/position_estimator_inav_params.c b/src/modules/position_estimator_inav/position_estimator_inav_params.c
index b71f9472f..d88419c25 100644
--- a/src/modules/position_estimator_inav/position_estimator_inav_params.c
+++ b/src/modules/position_estimator_inav/position_estimator_inav_params.c
@@ -42,31 +42,28 @@
 
 PARAM_DEFINE_FLOAT(INAV_W_Z_BARO, 0.5f);
 PARAM_DEFINE_FLOAT(INAV_W_Z_GPS_P, 0.005f);
-PARAM_DEFINE_FLOAT(INAV_W_Z_ACC, 20.0f);
 PARAM_DEFINE_FLOAT(INAV_W_Z_SONAR, 3.0f);
 PARAM_DEFINE_FLOAT(INAV_W_XY_GPS_P, 1.0f);
 PARAM_DEFINE_FLOAT(INAV_W_XY_GPS_V, 2.0f);
-PARAM_DEFINE_FLOAT(INAV_W_XY_ACC, 20.0f);
 PARAM_DEFINE_FLOAT(INAV_W_XY_FLOW, 5.0f);
 PARAM_DEFINE_FLOAT(INAV_W_GPS_FLOW, 0.1f);
 PARAM_DEFINE_FLOAT(INAV_W_ACC_BIAS, 0.05f);
-PARAM_DEFINE_FLOAT(INAV_FLOW_K, 0.0165f);
+PARAM_DEFINE_FLOAT(INAV_FLOW_K, 0.15f);
 PARAM_DEFINE_FLOAT(INAV_FLOW_Q_MIN, 0.5f);
 PARAM_DEFINE_FLOAT(INAV_SONAR_FILT, 0.05f);
 PARAM_DEFINE_FLOAT(INAV_SONAR_ERR, 0.5f);
 PARAM_DEFINE_FLOAT(INAV_LAND_T, 3.0f);
 PARAM_DEFINE_FLOAT(INAV_LAND_DISP, 0.7f);
-PARAM_DEFINE_FLOAT(INAV_LAND_THR, 0.3f);
+PARAM_DEFINE_FLOAT(INAV_LAND_THR, 0.2f);
+PARAM_DEFINE_FLOAT(INAV_DELAY_GPS, 0.2f);
 
 int parameters_init(struct position_estimator_inav_param_handles *h)
 {
 	h->w_z_baro = param_find("INAV_W_Z_BARO");
 	h->w_z_gps_p = param_find("INAV_W_Z_GPS_P");
-	h->w_z_acc = param_find("INAV_W_Z_ACC");
 	h->w_z_sonar = param_find("INAV_W_Z_SONAR");
 	h->w_xy_gps_p = param_find("INAV_W_XY_GPS_P");
 	h->w_xy_gps_v = param_find("INAV_W_XY_GPS_V");
-	h->w_xy_acc = param_find("INAV_W_XY_ACC");
 	h->w_xy_flow = param_find("INAV_W_XY_FLOW");
 	h->w_gps_flow = param_find("INAV_W_GPS_FLOW");
 	h->w_acc_bias = param_find("INAV_W_ACC_BIAS");
@@ -77,6 +74,7 @@ int parameters_init(struct position_estimator_inav_param_handles *h)
 	h->land_t = param_find("INAV_LAND_T");
 	h->land_disp = param_find("INAV_LAND_DISP");
 	h->land_thr = param_find("INAV_LAND_THR");
+	h->delay_gps = param_find("INAV_DELAY_GPS");
 
 	return OK;
 }
@@ -85,11 +83,9 @@ int parameters_update(const struct position_estimator_inav_param_handles *h, str
 {
 	param_get(h->w_z_baro, &(p->w_z_baro));
 	param_get(h->w_z_gps_p, &(p->w_z_gps_p));
-	param_get(h->w_z_acc, &(p->w_z_acc));
 	param_get(h->w_z_sonar, &(p->w_z_sonar));
 	param_get(h->w_xy_gps_p, &(p->w_xy_gps_p));
 	param_get(h->w_xy_gps_v, &(p->w_xy_gps_v));
-	param_get(h->w_xy_acc, &(p->w_xy_acc));
 	param_get(h->w_xy_flow, &(p->w_xy_flow));
 	param_get(h->w_gps_flow, &(p->w_gps_flow));
 	param_get(h->w_acc_bias, &(p->w_acc_bias));
@@ -100,6 +96,7 @@ int parameters_update(const struct position_estimator_inav_param_handles *h, str
 	param_get(h->land_t, &(p->land_t));
 	param_get(h->land_disp, &(p->land_disp));
 	param_get(h->land_thr, &(p->land_thr));
+	param_get(h->delay_gps, &(p->delay_gps));
 
 	return OK;
 }
diff --git a/src/modules/position_estimator_inav/position_estimator_inav_params.h b/src/modules/position_estimator_inav/position_estimator_inav_params.h
index e2be079d3..df1cfaa71 100644
--- a/src/modules/position_estimator_inav/position_estimator_inav_params.h
+++ b/src/modules/position_estimator_inav/position_estimator_inav_params.h
@@ -43,11 +43,9 @@
 struct position_estimator_inav_params {
 	float w_z_baro;
 	float w_z_gps_p;
-	float w_z_acc;
 	float w_z_sonar;
 	float w_xy_gps_p;
 	float w_xy_gps_v;
-	float w_xy_acc;
 	float w_xy_flow;
 	float w_gps_flow;
 	float w_acc_bias;
@@ -58,16 +56,15 @@ struct position_estimator_inav_params {
 	float land_t;
 	float land_disp;
 	float land_thr;
+	float delay_gps;
 };
 
 struct position_estimator_inav_param_handles {
 	param_t w_z_baro;
 	param_t w_z_gps_p;
-	param_t w_z_acc;
 	param_t w_z_sonar;
 	param_t w_xy_gps_p;
 	param_t w_xy_gps_v;
-	param_t w_xy_acc;
 	param_t w_xy_flow;
 	param_t w_gps_flow;
 	param_t w_acc_bias;
@@ -78,6 +75,7 @@ struct position_estimator_inav_param_handles {
 	param_t land_t;
 	param_t land_disp;
 	param_t land_thr;
+	param_t delay_gps;
 };
 
 /**
diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe1.c b/src/modules/position_estimator_mc/codegen/kalman_dlqe1.c
deleted file mode 100755
index 977565b8e..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe1.c
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * kalman_dlqe1.c
- *
- * Code generation for function 'kalman_dlqe1'
- *
- * C source code generated on: Wed Feb 13 20:34:32 2013
- *
- */
-
-/* Include files */
-#include "rt_nonfinite.h"
-#include "kalman_dlqe1.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-
-/* Function Definitions */
-void kalman_dlqe1(const real32_T A[9], const real32_T C[3], const real32_T K[3],
-                  const real32_T x_aposteriori_k[3], real32_T z, real32_T
-                  x_aposteriori[3])
-{
-	printf("[dlqe input]: x_aposteriori_k %12.8f\t %12.8f\t %12.8f\t z:%12.8f\n", (double)(x_aposteriori_k[0]), (double)(x_aposteriori_k[1]), (double)(x_aposteriori_k[2]), (double)z);
-	printf("[dlqe input]: C[0]: %12.8f\tC[1] %12.8f\tC[2] %12.8f\n", (double)(C[0]), (double)(C[1]), (double)(C[2]));
-  real32_T y;
-  int32_T i0;
-  real32_T b_y[3];
-  int32_T i1;
-  real32_T f0;
-  y = 0.0F;
-  for (i0 = 0; i0 < 3; i0++) {
-    b_y[i0] = 0.0F;
-    for (i1 = 0; i1 < 3; i1++) {
-      b_y[i0] += C[i1] * A[i1 + 3 * i0];
-    }
-
-    y += b_y[i0] * x_aposteriori_k[i0];
-  }
-
-  y = z - y;
-  for (i0 = 0; i0 < 3; i0++) {
-    f0 = 0.0F;
-    for (i1 = 0; i1 < 3; i1++) {
-      f0 += A[i0 + 3 * i1] * x_aposteriori_k[i1];
-    }
-
-    x_aposteriori[i0] = f0 + K[i0] * y;
-  }
-  //printf("[dlqe output]: x_aposteriori %12.8f\t %12.8f\t %12.8f\n", (double)(x_aposteriori[0]), (double)(x_aposteriori[1]), (double)(x_aposteriori[2]));
-}
-
-/* End of code generation (kalman_dlqe1.c) */
diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe1.h b/src/modules/position_estimator_mc/codegen/kalman_dlqe1.h
deleted file mode 100755
index 2f5330563..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe1.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * kalman_dlqe1.h
- *
- * Code generation for function 'kalman_dlqe1'
- *
- * C source code generated on: Wed Feb 13 20:34:32 2013
- *
- */
-
-#ifndef __KALMAN_DLQE1_H__
-#define __KALMAN_DLQE1_H__
-/* Include files */
-#include <stddef.h>
-#include <stdlib.h>
-
-#include "rtwtypes.h"
-#include "kalman_dlqe1_types.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-extern void kalman_dlqe1(const real32_T A[9], const real32_T C[3], const real32_T K[3], const real32_T x_aposteriori_k[3], real32_T z, real32_T x_aposteriori[3]);
-#endif
-/* End of code generation (kalman_dlqe1.h) */
diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe1_initialize.c b/src/modules/position_estimator_mc/codegen/kalman_dlqe1_initialize.c
deleted file mode 100755
index 6627f76e9..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe1_initialize.c
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * kalman_dlqe1_initialize.c
- *
- * Code generation for function 'kalman_dlqe1_initialize'
- *
- * C source code generated on: Wed Feb 13 20:34:31 2013
- *
- */
-
-/* Include files */
-#include "rt_nonfinite.h"
-#include "kalman_dlqe1.h"
-#include "kalman_dlqe1_initialize.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-
-/* Function Definitions */
-void kalman_dlqe1_initialize(void)
-{
-  rt_InitInfAndNaN(8U);
-}
-
-/* End of code generation (kalman_dlqe1_initialize.c) */
diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe1_initialize.h b/src/modules/position_estimator_mc/codegen/kalman_dlqe1_initialize.h
deleted file mode 100755
index a77eb5712..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe1_initialize.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * kalman_dlqe1_initialize.h
- *
- * Code generation for function 'kalman_dlqe1_initialize'
- *
- * C source code generated on: Wed Feb 13 20:34:31 2013
- *
- */
-
-#ifndef __KALMAN_DLQE1_INITIALIZE_H__
-#define __KALMAN_DLQE1_INITIALIZE_H__
-/* Include files */
-#include <stddef.h>
-#include <stdlib.h>
-
-#include "rtwtypes.h"
-#include "kalman_dlqe1_types.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-extern void kalman_dlqe1_initialize(void);
-#endif
-/* End of code generation (kalman_dlqe1_initialize.h) */
diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe1_terminate.c b/src/modules/position_estimator_mc/codegen/kalman_dlqe1_terminate.c
deleted file mode 100755
index a65536f79..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe1_terminate.c
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * kalman_dlqe1_terminate.c
- *
- * Code generation for function 'kalman_dlqe1_terminate'
- *
- * C source code generated on: Wed Feb 13 20:34:31 2013
- *
- */
-
-/* Include files */
-#include "rt_nonfinite.h"
-#include "kalman_dlqe1.h"
-#include "kalman_dlqe1_terminate.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-
-/* Function Definitions */
-void kalman_dlqe1_terminate(void)
-{
-  /* (no terminate code required) */
-}
-
-/* End of code generation (kalman_dlqe1_terminate.c) */
diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe1_terminate.h b/src/modules/position_estimator_mc/codegen/kalman_dlqe1_terminate.h
deleted file mode 100755
index 100c7f76c..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe1_terminate.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * kalman_dlqe1_terminate.h
- *
- * Code generation for function 'kalman_dlqe1_terminate'
- *
- * C source code generated on: Wed Feb 13 20:34:32 2013
- *
- */
-
-#ifndef __KALMAN_DLQE1_TERMINATE_H__
-#define __KALMAN_DLQE1_TERMINATE_H__
-/* Include files */
-#include <stddef.h>
-#include <stdlib.h>
-
-#include "rtwtypes.h"
-#include "kalman_dlqe1_types.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-extern void kalman_dlqe1_terminate(void);
-#endif
-/* End of code generation (kalman_dlqe1_terminate.h) */
diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe1_types.h b/src/modules/position_estimator_mc/codegen/kalman_dlqe1_types.h
deleted file mode 100755
index d4b2c2d61..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe1_types.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * kalman_dlqe1_types.h
- *
- * Code generation for function 'kalman_dlqe1'
- *
- * C source code generated on: Wed Feb 13 20:34:31 2013
- *
- */
-
-#ifndef __KALMAN_DLQE1_TYPES_H__
-#define __KALMAN_DLQE1_TYPES_H__
-
-/* Type Definitions */
-
-#endif
-/* End of code generation (kalman_dlqe1_types.h) */
diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe2.c b/src/modules/position_estimator_mc/codegen/kalman_dlqe2.c
deleted file mode 100755
index 11b999064..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe2.c
+++ /dev/null
@@ -1,119 +0,0 @@
-/*
- * kalman_dlqe2.c
- *
- * Code generation for function 'kalman_dlqe2'
- *
- * C source code generated on: Thu Feb 14 12:52:28 2013
- *
- */
-
-/* Include files */
-#include "rt_nonfinite.h"
-#include "kalman_dlqe2.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-static real32_T rt_powf_snf(real32_T u0, real32_T u1);
-
-/* Function Definitions */
-static real32_T rt_powf_snf(real32_T u0, real32_T u1)
-{
-  real32_T y;
-  real32_T f1;
-  real32_T f2;
-  if (rtIsNaNF(u0) || rtIsNaNF(u1)) {
-    y = ((real32_T)rtNaN);
-  } else {
-    f1 = (real32_T)fabs(u0);
-    f2 = (real32_T)fabs(u1);
-    if (rtIsInfF(u1)) {
-      if (f1 == 1.0F) {
-        y = ((real32_T)rtNaN);
-      } else if (f1 > 1.0F) {
-        if (u1 > 0.0F) {
-          y = ((real32_T)rtInf);
-        } else {
-          y = 0.0F;
-        }
-      } else if (u1 > 0.0F) {
-        y = 0.0F;
-      } else {
-        y = ((real32_T)rtInf);
-      }
-    } else if (f2 == 0.0F) {
-      y = 1.0F;
-    } else if (f2 == 1.0F) {
-      if (u1 > 0.0F) {
-        y = u0;
-      } else {
-        y = 1.0F / u0;
-      }
-    } else if (u1 == 2.0F) {
-      y = u0 * u0;
-    } else if ((u1 == 0.5F) && (u0 >= 0.0F)) {
-      y = (real32_T)sqrt(u0);
-    } else if ((u0 < 0.0F) && (u1 > (real32_T)floor(u1))) {
-      y = ((real32_T)rtNaN);
-    } else {
-      y = (real32_T)pow(u0, u1);
-    }
-  }
-
-  return y;
-}
-
-void kalman_dlqe2(real32_T dt, real32_T k1, real32_T k2, real32_T k3, const
-                  real32_T x_aposteriori_k[3], real32_T z, real32_T
-                  x_aposteriori[3])
-{
-	//printf("[dqle2] dt: %12.8f\tvk1 %12.8f\tk2: %12.8f\tk3: %12.8f\n", (double)(dt), (double)(k1), (double)(k2), (double)(k3));
-	//printf("[dqle2] dt: %8.4f\n", (double)(dt));//, (double)(k1), (double)(k2), (double)(k3));
-  real32_T A[9];
-  real32_T y;
-  int32_T i0;
-  static const int8_T iv0[3] = { 0, 0, 1 };
-
-  real32_T b_k1[3];
-  int32_T i1;
-  static const int8_T iv1[3] = { 1, 0, 0 };
-
-  real32_T f0;
-  A[0] = 1.0F;
-  A[3] = dt;
-  A[6] = 0.5F * rt_powf_snf(dt, 2.0F);
-  A[1] = 0.0F;
-  A[4] = 1.0F;
-  A[7] = dt;
-  y = 0.0F;
-  for (i0 = 0; i0 < 3; i0++) {
-    A[2 + 3 * i0] = (real32_T)iv0[i0];
-    b_k1[i0] = 0.0F;
-    for (i1 = 0; i1 < 3; i1++) {
-      b_k1[i0] += (real32_T)iv1[i1] * A[i1 + 3 * i0];
-    }
-
-    y += b_k1[i0] * x_aposteriori_k[i0];
-  }
-
-  y = z - y;
-  b_k1[0] = k1;
-  b_k1[1] = k2;
-  b_k1[2] = k3;
-  for (i0 = 0; i0 < 3; i0++) {
-    f0 = 0.0F;
-    for (i1 = 0; i1 < 3; i1++) {
-      f0 += A[i0 + 3 * i1] * x_aposteriori_k[i1];
-    }
-
-    x_aposteriori[i0] = f0 + b_k1[i0] * y;
-  }
-}
-
-/* End of code generation (kalman_dlqe2.c) */
diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe2.h b/src/modules/position_estimator_mc/codegen/kalman_dlqe2.h
deleted file mode 100755
index 30170ae22..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe2.h
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * kalman_dlqe2.h
- *
- * Code generation for function 'kalman_dlqe2'
- *
- * C source code generated on: Thu Feb 14 12:52:29 2013
- *
- */
-
-#ifndef __KALMAN_DLQE2_H__
-#define __KALMAN_DLQE2_H__
-/* Include files */
-#include <math.h>
-#include <stddef.h>
-#include <stdlib.h>
-#include "rt_nonfinite.h"
-
-#include "rtwtypes.h"
-#include "kalman_dlqe2_types.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-extern void kalman_dlqe2(real32_T dt, real32_T k1, real32_T k2, real32_T k3, const real32_T x_aposteriori_k[3], real32_T z, real32_T x_aposteriori[3]);
-#endif
-/* End of code generation (kalman_dlqe2.h) */
diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe2_initialize.c b/src/modules/position_estimator_mc/codegen/kalman_dlqe2_initialize.c
deleted file mode 100755
index de5a1d8aa..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe2_initialize.c
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * kalman_dlqe2_initialize.c
- *
- * Code generation for function 'kalman_dlqe2_initialize'
- *
- * C source code generated on: Thu Feb 14 12:52:28 2013
- *
- */
-
-/* Include files */
-#include "rt_nonfinite.h"
-#include "kalman_dlqe2.h"
-#include "kalman_dlqe2_initialize.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-
-/* Function Definitions */
-void kalman_dlqe2_initialize(void)
-{
-  rt_InitInfAndNaN(8U);
-}
-
-/* End of code generation (kalman_dlqe2_initialize.c) */
diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe2_initialize.h b/src/modules/position_estimator_mc/codegen/kalman_dlqe2_initialize.h
deleted file mode 100755
index 3d507ff31..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe2_initialize.h
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * kalman_dlqe2_initialize.h
- *
- * Code generation for function 'kalman_dlqe2_initialize'
- *
- * C source code generated on: Thu Feb 14 12:52:28 2013
- *
- */
-
-#ifndef __KALMAN_DLQE2_INITIALIZE_H__
-#define __KALMAN_DLQE2_INITIALIZE_H__
-/* Include files */
-#include <math.h>
-#include <stddef.h>
-#include <stdlib.h>
-#include "rt_nonfinite.h"
-
-#include "rtwtypes.h"
-#include "kalman_dlqe2_types.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-extern void kalman_dlqe2_initialize(void);
-#endif
-/* End of code generation (kalman_dlqe2_initialize.h) */
diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe2_terminate.c b/src/modules/position_estimator_mc/codegen/kalman_dlqe2_terminate.c
deleted file mode 100755
index 0757c878c..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe2_terminate.c
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * kalman_dlqe2_terminate.c
- *
- * Code generation for function 'kalman_dlqe2_terminate'
- *
- * C source code generated on: Thu Feb 14 12:52:28 2013
- *
- */
-
-/* Include files */
-#include "rt_nonfinite.h"
-#include "kalman_dlqe2.h"
-#include "kalman_dlqe2_terminate.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-
-/* Function Definitions */
-void kalman_dlqe2_terminate(void)
-{
-  /* (no terminate code required) */
-}
-
-/* End of code generation (kalman_dlqe2_terminate.c) */
diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe2_terminate.h b/src/modules/position_estimator_mc/codegen/kalman_dlqe2_terminate.h
deleted file mode 100755
index 23995020b..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe2_terminate.h
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * kalman_dlqe2_terminate.h
- *
- * Code generation for function 'kalman_dlqe2_terminate'
- *
- * C source code generated on: Thu Feb 14 12:52:28 2013
- *
- */
-
-#ifndef __KALMAN_DLQE2_TERMINATE_H__
-#define __KALMAN_DLQE2_TERMINATE_H__
-/* Include files */
-#include <math.h>
-#include <stddef.h>
-#include <stdlib.h>
-#include "rt_nonfinite.h"
-
-#include "rtwtypes.h"
-#include "kalman_dlqe2_types.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-extern void kalman_dlqe2_terminate(void);
-#endif
-/* End of code generation (kalman_dlqe2_terminate.h) */
diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe2_types.h b/src/modules/position_estimator_mc/codegen/kalman_dlqe2_types.h
deleted file mode 100755
index f7a04d908..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe2_types.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * kalman_dlqe2_types.h
- *
- * Code generation for function 'kalman_dlqe2'
- *
- * C source code generated on: Thu Feb 14 12:52:28 2013
- *
- */
-
-#ifndef __KALMAN_DLQE2_TYPES_H__
-#define __KALMAN_DLQE2_TYPES_H__
-
-/* Type Definitions */
-
-#endif
-/* End of code generation (kalman_dlqe2_types.h) */
diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe3.c b/src/modules/position_estimator_mc/codegen/kalman_dlqe3.c
deleted file mode 100755
index 9efe2ea7a..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe3.c
+++ /dev/null
@@ -1,137 +0,0 @@
-/*

- * kalman_dlqe3.c

- *

- * Code generation for function 'kalman_dlqe3'

- *

- * C source code generated on: Tue Feb 19 15:26:31 2013

- *

- */

-

-/* Include files */

-#include "rt_nonfinite.h"

-#include "kalman_dlqe3.h"

-#include "randn.h"

-

-/* Type Definitions */

-

-/* Named Constants */

-

-/* Variable Declarations */

-

-/* Variable Definitions */

-

-/* Function Declarations */

-static real32_T rt_powf_snf(real32_T u0, real32_T u1);

-

-/* Function Definitions */

-static real32_T rt_powf_snf(real32_T u0, real32_T u1)

-{

-  real32_T y;

-  real32_T f1;

-  real32_T f2;

-  if (rtIsNaNF(u0) || rtIsNaNF(u1)) {

-    y = ((real32_T)rtNaN);

-  } else {

-    f1 = (real32_T)fabs(u0);

-    f2 = (real32_T)fabs(u1);

-    if (rtIsInfF(u1)) {

-      if (f1 == 1.0F) {

-        y = ((real32_T)rtNaN);

-      } else if (f1 > 1.0F) {

-        if (u1 > 0.0F) {

-          y = ((real32_T)rtInf);

-        } else {

-          y = 0.0F;

-        }

-      } else if (u1 > 0.0F) {

-        y = 0.0F;

-      } else {

-        y = ((real32_T)rtInf);

-      }

-    } else if (f2 == 0.0F) {

-      y = 1.0F;

-    } else if (f2 == 1.0F) {

-      if (u1 > 0.0F) {

-        y = u0;

-      } else {

-        y = 1.0F / u0;

-      }

-    } else if (u1 == 2.0F) {

-      y = u0 * u0;

-    } else if ((u1 == 0.5F) && (u0 >= 0.0F)) {

-      y = (real32_T)sqrt(u0);

-    } else if ((u0 < 0.0F) && (u1 > (real32_T)floor(u1))) {

-      y = ((real32_T)rtNaN);

-    } else {

-      y = (real32_T)pow(u0, u1);

-    }

-  }

-

-  return y;

-}

-

-void kalman_dlqe3(real32_T dt, real32_T k1, real32_T k2, real32_T k3, const

-                  real32_T x_aposteriori_k[3], real32_T z, real32_T posUpdate,

-                  real32_T addNoise, real32_T sigma, real32_T x_aposteriori[3])

-{

-  real32_T A[9];

-  int32_T i0;

-  static const int8_T iv0[3] = { 0, 0, 1 };

-

-  real_T b;

-  real32_T y;

-  real32_T b_y[3];

-  int32_T i1;

-  static const int8_T iv1[3] = { 1, 0, 0 };

-

-  real32_T b_k1[3];

-  real32_T f0;

-  A[0] = 1.0F;

-  A[3] = dt;

-  A[6] = 0.5F * rt_powf_snf(dt, 2.0F);

-  A[1] = 0.0F;

-  A[4] = 1.0F;

-  A[7] = dt;

-  for (i0 = 0; i0 < 3; i0++) {

-    A[2 + 3 * i0] = (real32_T)iv0[i0];

-  }

-

-  if (addNoise == 1.0F) {

-    b = randn();

-    z += sigma * (real32_T)b;

-  }

-

-  if (posUpdate != 0.0F) {

-    y = 0.0F;

-    for (i0 = 0; i0 < 3; i0++) {

-      b_y[i0] = 0.0F;

-      for (i1 = 0; i1 < 3; i1++) {

-        b_y[i0] += (real32_T)iv1[i1] * A[i1 + 3 * i0];

-      }

-

-      y += b_y[i0] * x_aposteriori_k[i0];

-    }

-

-    y = z - y;

-    b_k1[0] = k1;

-    b_k1[1] = k2;

-    b_k1[2] = k3;

-    for (i0 = 0; i0 < 3; i0++) {

-      f0 = 0.0F;

-      for (i1 = 0; i1 < 3; i1++) {

-        f0 += A[i0 + 3 * i1] * x_aposteriori_k[i1];

-      }

-

-      x_aposteriori[i0] = f0 + b_k1[i0] * y;

-    }

-  } else {

-    for (i0 = 0; i0 < 3; i0++) {

-      x_aposteriori[i0] = 0.0F;

-      for (i1 = 0; i1 < 3; i1++) {

-        x_aposteriori[i0] += A[i0 + 3 * i1] * x_aposteriori_k[i1];

-      }

-    }

-  }

-}

-

-/* End of code generation (kalman_dlqe3.c) */

diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe3.h b/src/modules/position_estimator_mc/codegen/kalman_dlqe3.h
deleted file mode 100755
index 9bbffbbb3..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe3.h
+++ /dev/null
@@ -1,33 +0,0 @@
-/*

- * kalman_dlqe3.h

- *

- * Code generation for function 'kalman_dlqe3'

- *

- * C source code generated on: Tue Feb 19 15:26:32 2013

- *

- */

-

-#ifndef __KALMAN_DLQE3_H__

-#define __KALMAN_DLQE3_H__

-/* Include files */

-#include <math.h>

-#include <stddef.h>

-#include <stdlib.h>

-#include <string.h>

-#include "rt_nonfinite.h"

-

-#include "rtwtypes.h"

-#include "kalman_dlqe3_types.h"

-

-/* Type Definitions */

-

-/* Named Constants */

-

-/* Variable Declarations */

-

-/* Variable Definitions */

-

-/* Function Declarations */

-extern void kalman_dlqe3(real32_T dt, real32_T k1, real32_T k2, real32_T k3, const real32_T x_aposteriori_k[3], real32_T z, real32_T posUpdate, real32_T addNoise, real32_T sigma, real32_T x_aposteriori[3]);

-#endif

-/* End of code generation (kalman_dlqe3.h) */

diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe3_data.c b/src/modules/position_estimator_mc/codegen/kalman_dlqe3_data.c
deleted file mode 100755
index 8f2275c13..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe3_data.c
+++ /dev/null
@@ -1,32 +0,0 @@
-/*

- * kalman_dlqe3_data.c

- *

- * Code generation for function 'kalman_dlqe3_data'

- *

- * C source code generated on: Tue Feb 19 15:26:31 2013

- *

- */

-

-/* Include files */

-#include "rt_nonfinite.h"

-#include "kalman_dlqe3.h"

-#include "kalman_dlqe3_data.h"

-

-/* Type Definitions */

-

-/* Named Constants */

-

-/* Variable Declarations */

-

-/* Variable Definitions */

-uint32_T method;

-uint32_T state[2];

-uint32_T b_method;

-uint32_T b_state;

-uint32_T c_state[2];

-boolean_T state_not_empty;

-

-/* Function Declarations */

-

-/* Function Definitions */

-/* End of code generation (kalman_dlqe3_data.c) */

diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe3_data.h b/src/modules/position_estimator_mc/codegen/kalman_dlqe3_data.h
deleted file mode 100755
index 952eb7b89..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe3_data.h
+++ /dev/null
@@ -1,38 +0,0 @@
-/*

- * kalman_dlqe3_data.h

- *

- * Code generation for function 'kalman_dlqe3_data'

- *

- * C source code generated on: Tue Feb 19 15:26:31 2013

- *

- */

-

-#ifndef __KALMAN_DLQE3_DATA_H__

-#define __KALMAN_DLQE3_DATA_H__

-/* Include files */

-#include <math.h>

-#include <stddef.h>

-#include <stdlib.h>

-#include <string.h>

-#include "rt_nonfinite.h"

-

-#include "rtwtypes.h"

-#include "kalman_dlqe3_types.h"

-

-/* Type Definitions */

-

-/* Named Constants */

-

-/* Variable Declarations */

-extern uint32_T method;

-extern uint32_T state[2];

-extern uint32_T b_method;

-extern uint32_T b_state;

-extern uint32_T c_state[2];

-extern boolean_T state_not_empty;

-

-/* Variable Definitions */

-

-/* Function Declarations */

-#endif

-/* End of code generation (kalman_dlqe3_data.h) */

diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe3_initialize.c b/src/modules/position_estimator_mc/codegen/kalman_dlqe3_initialize.c
deleted file mode 100755
index b87d604c4..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe3_initialize.c
+++ /dev/null
@@ -1,47 +0,0 @@
-/*

- * kalman_dlqe3_initialize.c

- *

- * Code generation for function 'kalman_dlqe3_initialize'

- *

- * C source code generated on: Tue Feb 19 15:26:31 2013

- *

- */

-

-/* Include files */

-#include "rt_nonfinite.h"

-#include "kalman_dlqe3.h"

-#include "kalman_dlqe3_initialize.h"

-#include "kalman_dlqe3_data.h"

-

-/* Type Definitions */

-

-/* Named Constants */

-

-/* Variable Declarations */

-

-/* Variable Definitions */

-

-/* Function Declarations */

-

-/* Function Definitions */

-void kalman_dlqe3_initialize(void)

-{

-  int32_T i;

-  static const uint32_T uv0[2] = { 362436069U, 0U };

-

-  rt_InitInfAndNaN(8U);

-  state_not_empty = FALSE;

-  b_state = 1144108930U;

-  b_method = 7U;

-  method = 0U;

-  for (i = 0; i < 2; i++) {

-    c_state[i] = 362436069U + 158852560U * (uint32_T)i;

-    state[i] = uv0[i];

-  }

-

-  if (state[1] == 0U) {

-    state[1] = 521288629U;

-  }

-}

-

-/* End of code generation (kalman_dlqe3_initialize.c) */

diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe3_initialize.h b/src/modules/position_estimator_mc/codegen/kalman_dlqe3_initialize.h
deleted file mode 100755
index 9dee90f9e..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe3_initialize.h
+++ /dev/null
@@ -1,33 +0,0 @@
-/*

- * kalman_dlqe3_initialize.h

- *

- * Code generation for function 'kalman_dlqe3_initialize'

- *

- * C source code generated on: Tue Feb 19 15:26:31 2013

- *

- */

-

-#ifndef __KALMAN_DLQE3_INITIALIZE_H__

-#define __KALMAN_DLQE3_INITIALIZE_H__

-/* Include files */

-#include <math.h>

-#include <stddef.h>

-#include <stdlib.h>

-#include <string.h>

-#include "rt_nonfinite.h"

-

-#include "rtwtypes.h"

-#include "kalman_dlqe3_types.h"

-

-/* Type Definitions */

-

-/* Named Constants */

-

-/* Variable Declarations */

-

-/* Variable Definitions */

-

-/* Function Declarations */

-extern void kalman_dlqe3_initialize(void);

-#endif

-/* End of code generation (kalman_dlqe3_initialize.h) */

diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe3_terminate.c b/src/modules/position_estimator_mc/codegen/kalman_dlqe3_terminate.c
deleted file mode 100755
index b00858205..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe3_terminate.c
+++ /dev/null
@@ -1,31 +0,0 @@
-/*

- * kalman_dlqe3_terminate.c

- *

- * Code generation for function 'kalman_dlqe3_terminate'

- *

- * C source code generated on: Tue Feb 19 15:26:31 2013

- *

- */

-

-/* Include files */

-#include "rt_nonfinite.h"

-#include "kalman_dlqe3.h"

-#include "kalman_dlqe3_terminate.h"

-

-/* Type Definitions */

-

-/* Named Constants */

-

-/* Variable Declarations */

-

-/* Variable Definitions */

-

-/* Function Declarations */

-

-/* Function Definitions */

-void kalman_dlqe3_terminate(void)

-{

-  /* (no terminate code required) */

-}

-

-/* End of code generation (kalman_dlqe3_terminate.c) */

diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe3_terminate.h b/src/modules/position_estimator_mc/codegen/kalman_dlqe3_terminate.h
deleted file mode 100755
index 69cc85c76..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe3_terminate.h
+++ /dev/null
@@ -1,33 +0,0 @@
-/*

- * kalman_dlqe3_terminate.h

- *

- * Code generation for function 'kalman_dlqe3_terminate'

- *

- * C source code generated on: Tue Feb 19 15:26:31 2013

- *

- */

-

-#ifndef __KALMAN_DLQE3_TERMINATE_H__

-#define __KALMAN_DLQE3_TERMINATE_H__

-/* Include files */

-#include <math.h>

-#include <stddef.h>

-#include <stdlib.h>

-#include <string.h>

-#include "rt_nonfinite.h"

-

-#include "rtwtypes.h"

-#include "kalman_dlqe3_types.h"

-

-/* Type Definitions */

-

-/* Named Constants */

-

-/* Variable Declarations */

-

-/* Variable Definitions */

-

-/* Function Declarations */

-extern void kalman_dlqe3_terminate(void);

-#endif

-/* End of code generation (kalman_dlqe3_terminate.h) */

diff --git a/src/modules/position_estimator_mc/codegen/kalman_dlqe3_types.h b/src/modules/position_estimator_mc/codegen/kalman_dlqe3_types.h
deleted file mode 100755
index f36ea4557..000000000
--- a/src/modules/position_estimator_mc/codegen/kalman_dlqe3_types.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*

- * kalman_dlqe3_types.h

- *

- * Code generation for function 'kalman_dlqe3'

- *

- * C source code generated on: Tue Feb 19 15:26:30 2013

- *

- */

-

-#ifndef __KALMAN_DLQE3_TYPES_H__

-#define __KALMAN_DLQE3_TYPES_H__

-

-/* Type Definitions */

-

-#endif

-/* End of code generation (kalman_dlqe3_types.h) */

diff --git a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D.c b/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D.c
deleted file mode 100755
index 5139848bc..000000000
--- a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D.c
+++ /dev/null
@@ -1,136 +0,0 @@
-/*
- * positionKalmanFilter1D.c
- *
- * Code generation for function 'positionKalmanFilter1D'
- *
- * C source code generated on: Fri Nov 30 14:26:11 2012
- *
- */
-
-/* Include files */
-#include "rt_nonfinite.h"
-#include "positionKalmanFilter1D.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-
-/* Function Definitions */
-void positionKalmanFilter1D(const real32_T A[9], const real32_T B[3], const
-  real32_T C[3], const real32_T x_aposteriori_k[3], const real32_T
-  P_aposteriori_k[9], real32_T u, real32_T z, uint8_T gps_update, const real32_T
-  Q[9], real32_T R, real32_T thresh, real32_T decay, real32_T x_aposteriori[3],
-  real32_T P_aposteriori[9])
-{
-  int32_T i0;
-  real32_T f0;
-  int32_T k;
-  real32_T b_A[9];
-  int32_T i1;
-  real32_T P_apriori[9];
-  real32_T y;
-  real32_T K[3];
-  real32_T S;
-  int8_T I[9];
-
-  /* prediction */
-  for (i0 = 0; i0 < 3; i0++) {
-    f0 = 0.0F;
-    for (k = 0; k < 3; k++) {
-      f0 += A[i0 + 3 * k] * x_aposteriori_k[k];
-    }
-
-    x_aposteriori[i0] = f0 + B[i0] * u;
-  }
-
-  for (i0 = 0; i0 < 3; i0++) {
-    for (k = 0; k < 3; k++) {
-      b_A[i0 + 3 * k] = 0.0F;
-      for (i1 = 0; i1 < 3; i1++) {
-        b_A[i0 + 3 * k] += A[i0 + 3 * i1] * P_aposteriori_k[i1 + 3 * k];
-      }
-    }
-  }
-
-  for (i0 = 0; i0 < 3; i0++) {
-    for (k = 0; k < 3; k++) {
-      f0 = 0.0F;
-      for (i1 = 0; i1 < 3; i1++) {
-        f0 += b_A[i0 + 3 * i1] * A[k + 3 * i1];
-      }
-
-      P_apriori[i0 + 3 * k] = f0 + Q[i0 + 3 * k];
-    }
-  }
-
-  if ((real32_T)fabs(u) < thresh) {
-    x_aposteriori[1] *= decay;
-  }
-
-  /* update */
-  if (gps_update == 1) {
-    y = 0.0F;
-    for (k = 0; k < 3; k++) {
-      y += C[k] * x_aposteriori[k];
-      K[k] = 0.0F;
-      for (i0 = 0; i0 < 3; i0++) {
-        K[k] += C[i0] * P_apriori[i0 + 3 * k];
-      }
-    }
-
-    y = z - y;
-    S = 0.0F;
-    for (k = 0; k < 3; k++) {
-      S += K[k] * C[k];
-    }
-
-    S += R;
-    for (i0 = 0; i0 < 3; i0++) {
-      f0 = 0.0F;
-      for (k = 0; k < 3; k++) {
-        f0 += P_apriori[i0 + 3 * k] * C[k];
-      }
-
-      K[i0] = f0 / S;
-    }
-
-    for (i0 = 0; i0 < 3; i0++) {
-      x_aposteriori[i0] += K[i0] * y;
-    }
-
-    for (i0 = 0; i0 < 9; i0++) {
-      I[i0] = 0;
-    }
-
-    for (k = 0; k < 3; k++) {
-      I[k + 3 * k] = 1;
-    }
-
-    for (i0 = 0; i0 < 3; i0++) {
-      for (k = 0; k < 3; k++) {
-        b_A[k + 3 * i0] = (real32_T)I[k + 3 * i0] - K[k] * C[i0];
-      }
-    }
-
-    for (i0 = 0; i0 < 3; i0++) {
-      for (k = 0; k < 3; k++) {
-        P_aposteriori[i0 + 3 * k] = 0.0F;
-        for (i1 = 0; i1 < 3; i1++) {
-          P_aposteriori[i0 + 3 * k] += b_A[i0 + 3 * i1] * P_apriori[i1 + 3 * k];
-        }
-      }
-    }
-  } else {
-    for (i0 = 0; i0 < 9; i0++) {
-      P_aposteriori[i0] = P_apriori[i0];
-    }
-  }
-}
-
-/* End of code generation (positionKalmanFilter1D.c) */
diff --git a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D.h b/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D.h
deleted file mode 100755
index 205c8eb4e..000000000
--- a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * positionKalmanFilter1D.h
- *
- * Code generation for function 'positionKalmanFilter1D'
- *
- * C source code generated on: Fri Nov 30 14:26:11 2012
- *
- */
-
-#ifndef __POSITIONKALMANFILTER1D_H__
-#define __POSITIONKALMANFILTER1D_H__
-/* Include files */
-#include <math.h>
-#include <stddef.h>
-#include <stdlib.h>
-
-#include "rtwtypes.h"
-#include "positionKalmanFilter1D_types.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-extern void positionKalmanFilter1D(const real32_T A[9], const real32_T B[3], const real32_T C[3], const real32_T x_aposteriori_k[3], const real32_T P_aposteriori_k[9], real32_T u, real32_T z, uint8_T gps_update, const real32_T Q[9], real32_T R, real32_T thresh, real32_T decay, real32_T x_aposteriori[3], real32_T P_aposteriori[9]);
-#endif
-/* End of code generation (positionKalmanFilter1D.h) */
diff --git a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT.c b/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT.c
deleted file mode 100755
index 4c535618a..000000000
--- a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT.c
+++ /dev/null
@@ -1,157 +0,0 @@
-/*
- * positionKalmanFilter1D_dT.c
- *
- * Code generation for function 'positionKalmanFilter1D_dT'
- *
- * C source code generated on: Fri Nov 30 17:37:33 2012
- *
- */
-
-/* Include files */
-#include "rt_nonfinite.h"
-#include "positionKalmanFilter1D_dT.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-
-/* Function Definitions */
-void positionKalmanFilter1D_dT(real32_T dT, const real32_T x_aposteriori_k[3],
-  const real32_T P_aposteriori_k[9], real32_T u, real32_T z, uint8_T gps_update,
-  const real32_T Q[9], real_T R, real32_T thresh, real32_T decay, real32_T
-  x_aposteriori[3], real32_T P_aposteriori[9])
-{
-  real32_T A[9];
-  int32_T i;
-  static const int8_T iv0[3] = { 0, 0, 1 };
-
-  real32_T K[3];
-  real32_T f0;
-  int32_T i0;
-  real32_T b_A[9];
-  int32_T i1;
-  real32_T P_apriori[9];
-  static const int8_T iv1[3] = { 1, 0, 0 };
-
-  real32_T fv0[3];
-  real32_T y;
-  static const int8_T iv2[3] = { 1, 0, 0 };
-
-  real32_T S;
-  int8_T I[9];
-
-  /* dynamics */
-  A[0] = 1.0F;
-  A[3] = dT;
-  A[6] = -0.5F * dT * dT;
-  A[1] = 0.0F;
-  A[4] = 1.0F;
-  A[7] = -dT;
-  for (i = 0; i < 3; i++) {
-    A[2 + 3 * i] = (real32_T)iv0[i];
-  }
-
-  /* prediction */
-  K[0] = 0.5F * dT * dT;
-  K[1] = dT;
-  K[2] = 0.0F;
-  for (i = 0; i < 3; i++) {
-    f0 = 0.0F;
-    for (i0 = 0; i0 < 3; i0++) {
-      f0 += A[i + 3 * i0] * x_aposteriori_k[i0];
-    }
-
-    x_aposteriori[i] = f0 + K[i] * u;
-  }
-
-  for (i = 0; i < 3; i++) {
-    for (i0 = 0; i0 < 3; i0++) {
-      b_A[i + 3 * i0] = 0.0F;
-      for (i1 = 0; i1 < 3; i1++) {
-        b_A[i + 3 * i0] += A[i + 3 * i1] * P_aposteriori_k[i1 + 3 * i0];
-      }
-    }
-  }
-
-  for (i = 0; i < 3; i++) {
-    for (i0 = 0; i0 < 3; i0++) {
-      f0 = 0.0F;
-      for (i1 = 0; i1 < 3; i1++) {
-        f0 += b_A[i + 3 * i1] * A[i0 + 3 * i1];
-      }
-
-      P_apriori[i + 3 * i0] = f0 + Q[i + 3 * i0];
-    }
-  }
-
-  if ((real32_T)fabs(u) < thresh) {
-    x_aposteriori[1] *= decay;
-  }
-
-  /* update */
-  if (gps_update == 1) {
-    f0 = 0.0F;
-    for (i = 0; i < 3; i++) {
-      f0 += (real32_T)iv1[i] * x_aposteriori[i];
-      fv0[i] = 0.0F;
-      for (i0 = 0; i0 < 3; i0++) {
-        fv0[i] += (real32_T)iv1[i0] * P_apriori[i0 + 3 * i];
-      }
-    }
-
-    y = z - f0;
-    f0 = 0.0F;
-    for (i = 0; i < 3; i++) {
-      f0 += fv0[i] * (real32_T)iv2[i];
-    }
-
-    S = f0 + (real32_T)R;
-    for (i = 0; i < 3; i++) {
-      f0 = 0.0F;
-      for (i0 = 0; i0 < 3; i0++) {
-        f0 += P_apriori[i + 3 * i0] * (real32_T)iv2[i0];
-      }
-
-      K[i] = f0 / S;
-    }
-
-    for (i = 0; i < 3; i++) {
-      x_aposteriori[i] += K[i] * y;
-    }
-
-    for (i = 0; i < 9; i++) {
-      I[i] = 0;
-    }
-
-    for (i = 0; i < 3; i++) {
-      I[i + 3 * i] = 1;
-    }
-
-    for (i = 0; i < 3; i++) {
-      for (i0 = 0; i0 < 3; i0++) {
-        A[i0 + 3 * i] = (real32_T)I[i0 + 3 * i] - K[i0] * (real32_T)iv1[i];
-      }
-    }
-
-    for (i = 0; i < 3; i++) {
-      for (i0 = 0; i0 < 3; i0++) {
-        P_aposteriori[i + 3 * i0] = 0.0F;
-        for (i1 = 0; i1 < 3; i1++) {
-          P_aposteriori[i + 3 * i0] += A[i + 3 * i1] * P_apriori[i1 + 3 * i0];
-        }
-      }
-    }
-  } else {
-    for (i = 0; i < 9; i++) {
-      P_aposteriori[i] = P_apriori[i];
-    }
-  }
-}
-
-/* End of code generation (positionKalmanFilter1D_dT.c) */
diff --git a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT.h b/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT.h
deleted file mode 100755
index 94cbe2ce6..000000000
--- a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * positionKalmanFilter1D_dT.h
- *
- * Code generation for function 'positionKalmanFilter1D_dT'
- *
- * C source code generated on: Fri Nov 30 17:37:33 2012
- *
- */
-
-#ifndef __POSITIONKALMANFILTER1D_DT_H__
-#define __POSITIONKALMANFILTER1D_DT_H__
-/* Include files */
-#include <math.h>
-#include <stddef.h>
-#include <stdlib.h>
-
-#include "rtwtypes.h"
-#include "positionKalmanFilter1D_dT_types.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-extern void positionKalmanFilter1D_dT(real32_T dT, const real32_T x_aposteriori_k[3], const real32_T P_aposteriori_k[9], real32_T u, real32_T z, uint8_T gps_update, const real32_T Q[9], real_T R, real32_T thresh, real32_T decay, real32_T x_aposteriori[3], real32_T P_aposteriori[9]);
-#endif
-/* End of code generation (positionKalmanFilter1D_dT.h) */
diff --git a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT_initialize.c b/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT_initialize.c
deleted file mode 100755
index aa89f8a9d..000000000
--- a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT_initialize.c
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * positionKalmanFilter1D_dT_initialize.c
- *
- * Code generation for function 'positionKalmanFilter1D_dT_initialize'
- *
- * C source code generated on: Fri Nov 30 17:37:33 2012
- *
- */
-
-/* Include files */
-#include "rt_nonfinite.h"
-#include "positionKalmanFilter1D_dT.h"
-#include "positionKalmanFilter1D_dT_initialize.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-
-/* Function Definitions */
-void positionKalmanFilter1D_dT_initialize(void)
-{
-  rt_InitInfAndNaN(8U);
-}
-
-/* End of code generation (positionKalmanFilter1D_dT_initialize.c) */
diff --git a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT_initialize.h b/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT_initialize.h
deleted file mode 100755
index 8d358a9a3..000000000
--- a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT_initialize.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * positionKalmanFilter1D_dT_initialize.h
- *
- * Code generation for function 'positionKalmanFilter1D_dT_initialize'
- *
- * C source code generated on: Fri Nov 30 17:37:33 2012
- *
- */
-
-#ifndef __POSITIONKALMANFILTER1D_DT_INITIALIZE_H__
-#define __POSITIONKALMANFILTER1D_DT_INITIALIZE_H__
-/* Include files */
-#include <math.h>
-#include <stddef.h>
-#include <stdlib.h>
-
-#include "rtwtypes.h"
-#include "positionKalmanFilter1D_dT_types.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-extern void positionKalmanFilter1D_dT_initialize(void);
-#endif
-/* End of code generation (positionKalmanFilter1D_dT_initialize.h) */
diff --git a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT_terminate.c b/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT_terminate.c
deleted file mode 100755
index 20ed2edbb..000000000
--- a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT_terminate.c
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * positionKalmanFilter1D_dT_terminate.c
- *
- * Code generation for function 'positionKalmanFilter1D_dT_terminate'
- *
- * C source code generated on: Fri Nov 30 17:37:33 2012
- *
- */
-
-/* Include files */
-#include "rt_nonfinite.h"
-#include "positionKalmanFilter1D_dT.h"
-#include "positionKalmanFilter1D_dT_terminate.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-
-/* Function Definitions */
-void positionKalmanFilter1D_dT_terminate(void)
-{
-  /* (no terminate code required) */
-}
-
-/* End of code generation (positionKalmanFilter1D_dT_terminate.c) */
diff --git a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT_terminate.h b/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT_terminate.h
deleted file mode 100755
index 5eb5807a0..000000000
--- a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT_terminate.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * positionKalmanFilter1D_dT_terminate.h
- *
- * Code generation for function 'positionKalmanFilter1D_dT_terminate'
- *
- * C source code generated on: Fri Nov 30 17:37:33 2012
- *
- */
-
-#ifndef __POSITIONKALMANFILTER1D_DT_TERMINATE_H__
-#define __POSITIONKALMANFILTER1D_DT_TERMINATE_H__
-/* Include files */
-#include <math.h>
-#include <stddef.h>
-#include <stdlib.h>
-
-#include "rtwtypes.h"
-#include "positionKalmanFilter1D_dT_types.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-extern void positionKalmanFilter1D_dT_terminate(void);
-#endif
-/* End of code generation (positionKalmanFilter1D_dT_terminate.h) */
diff --git a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT_types.h b/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT_types.h
deleted file mode 100755
index 43e5f016c..000000000
--- a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_dT_types.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * positionKalmanFilter1D_dT_types.h
- *
- * Code generation for function 'positionKalmanFilter1D_dT'
- *
- * C source code generated on: Fri Nov 30 17:37:33 2012
- *
- */
-
-#ifndef __POSITIONKALMANFILTER1D_DT_TYPES_H__
-#define __POSITIONKALMANFILTER1D_DT_TYPES_H__
-
-/* Type Definitions */
-
-#endif
-/* End of code generation (positionKalmanFilter1D_dT_types.h) */
diff --git a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_initialize.c b/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_initialize.c
deleted file mode 100755
index 5bd87c390..000000000
--- a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_initialize.c
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * positionKalmanFilter1D_initialize.c
- *
- * Code generation for function 'positionKalmanFilter1D_initialize'
- *
- * C source code generated on: Fri Nov 30 14:26:11 2012
- *
- */
-
-/* Include files */
-#include "rt_nonfinite.h"
-#include "positionKalmanFilter1D.h"
-#include "positionKalmanFilter1D_initialize.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-
-/* Function Definitions */
-void positionKalmanFilter1D_initialize(void)
-{
-  rt_InitInfAndNaN(8U);
-}
-
-/* End of code generation (positionKalmanFilter1D_initialize.c) */
diff --git a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_initialize.h b/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_initialize.h
deleted file mode 100755
index 44bce472f..000000000
--- a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_initialize.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * positionKalmanFilter1D_initialize.h
- *
- * Code generation for function 'positionKalmanFilter1D_initialize'
- *
- * C source code generated on: Fri Nov 30 14:26:11 2012
- *
- */
-
-#ifndef __POSITIONKALMANFILTER1D_INITIALIZE_H__
-#define __POSITIONKALMANFILTER1D_INITIALIZE_H__
-/* Include files */
-#include <math.h>
-#include <stddef.h>
-#include <stdlib.h>
-
-#include "rtwtypes.h"
-#include "positionKalmanFilter1D_types.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-extern void positionKalmanFilter1D_initialize(void);
-#endif
-/* End of code generation (positionKalmanFilter1D_initialize.h) */
diff --git a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_terminate.c b/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_terminate.c
deleted file mode 100755
index 41e11936f..000000000
--- a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_terminate.c
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * positionKalmanFilter1D_terminate.c
- *
- * Code generation for function 'positionKalmanFilter1D_terminate'
- *
- * C source code generated on: Fri Nov 30 14:26:11 2012
- *
- */
-
-/* Include files */
-#include "rt_nonfinite.h"
-#include "positionKalmanFilter1D.h"
-#include "positionKalmanFilter1D_terminate.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-
-/* Function Definitions */
-void positionKalmanFilter1D_terminate(void)
-{
-  /* (no terminate code required) */
-}
-
-/* End of code generation (positionKalmanFilter1D_terminate.c) */
diff --git a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_terminate.h b/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_terminate.h
deleted file mode 100755
index e84ea01bc..000000000
--- a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_terminate.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * positionKalmanFilter1D_terminate.h
- *
- * Code generation for function 'positionKalmanFilter1D_terminate'
- *
- * C source code generated on: Fri Nov 30 14:26:11 2012
- *
- */
-
-#ifndef __POSITIONKALMANFILTER1D_TERMINATE_H__
-#define __POSITIONKALMANFILTER1D_TERMINATE_H__
-/* Include files */
-#include <math.h>
-#include <stddef.h>
-#include <stdlib.h>
-
-#include "rtwtypes.h"
-#include "positionKalmanFilter1D_types.h"
-
-/* Type Definitions */
-
-/* Named Constants */
-
-/* Variable Declarations */
-
-/* Variable Definitions */
-
-/* Function Declarations */
-extern void positionKalmanFilter1D_terminate(void);
-#endif
-/* End of code generation (positionKalmanFilter1D_terminate.h) */
diff --git a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_types.h b/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_types.h
deleted file mode 100755
index 4b473f56f..000000000
--- a/src/modules/position_estimator_mc/codegen/positionKalmanFilter1D_types.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * positionKalmanFilter1D_types.h
- *
- * Code generation for function 'positionKalmanFilter1D'
- *
- * C source code generated on: Fri Nov 30 14:26:11 2012
- *
- */
-
-#ifndef __POSITIONKALMANFILTER1D_TYPES_H__
-#define __POSITIONKALMANFILTER1D_TYPES_H__
-
-/* Type Definitions */
-
-#endif
-/* End of code generation (positionKalmanFilter1D_types.h) */
diff --git a/src/modules/position_estimator_mc/codegen/randn.c b/src/modules/position_estimator_mc/codegen/randn.c
deleted file mode 100755
index 51aef7b76..000000000
--- a/src/modules/position_estimator_mc/codegen/randn.c
+++ /dev/null
@@ -1,524 +0,0 @@
-/*

- * randn.c

- *

- * Code generation for function 'randn'

- *

- * C source code generated on: Tue Feb 19 15:26:32 2013

- *

- */

-

-/* Include files */

-#include "rt_nonfinite.h"

-#include "kalman_dlqe3.h"

-#include "randn.h"

-#include "kalman_dlqe3_data.h"

-

-/* Type Definitions */

-

-/* Named Constants */

-

-/* Variable Declarations */

-

-/* Variable Definitions */

-static uint32_T d_state[625];

-

-/* Function Declarations */

-static real_T b_genrandu(uint32_T mt[625]);

-static real_T eml_rand_mt19937ar(uint32_T e_state[625]);

-static real_T eml_rand_shr3cong(uint32_T e_state[2]);

-static void genrand_uint32_vector(uint32_T mt[625], uint32_T u[2]);

-static void genrandu(uint32_T s, uint32_T *e_state, real_T *r);

-static void twister_state_vector(uint32_T mt[625], real_T seed);

-

-/* Function Definitions */

-static real_T b_genrandu(uint32_T mt[625])

-{

-  real_T r;

-  int32_T exitg1;

-  uint32_T u[2];

-  boolean_T isvalid;

-  int32_T k;

-  boolean_T exitg2;

-

-  /* <LEGAL>   This is a uniform (0,1) pseudorandom number generator based on: */

-  /* <LEGAL> */

-  /* <LEGAL>    A C-program for MT19937, with initialization improved 2002/1/26. */

-  /* <LEGAL>    Coded by Takuji Nishimura and Makoto Matsumoto. */

-  /* <LEGAL> */

-  /* <LEGAL>    Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura, */

-  /* <LEGAL>    All rights reserved. */

-  /* <LEGAL> */

-  /* <LEGAL>    Redistribution and use in source and binary forms, with or without */

-  /* <LEGAL>    modification, are permitted provided that the following conditions */

-  /* <LEGAL>    are met: */

-  /* <LEGAL> */

-  /* <LEGAL>      1. Redistributions of source code must retain the above copyright */

-  /* <LEGAL>         notice, this list of conditions and the following disclaimer. */

-  /* <LEGAL> */

-  /* <LEGAL>      2. Redistributions in binary form must reproduce the above copyright */

-  /* <LEGAL>         notice, this list of conditions and the following disclaimer in the */

-  /* <LEGAL>         documentation and/or other materials provided with the distribution. */

-  /* <LEGAL> */

-  /* <LEGAL>      3. The names of its contributors may not be used to endorse or promote */

-  /* <LEGAL>         products derived from this software without specific prior written */

-  /* <LEGAL>         permission. */

-  /* <LEGAL> */

-  /* <LEGAL>    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */

-  /* <LEGAL>    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT */

-  /* <LEGAL>    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR */

-  /* <LEGAL>    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR */

-  /* <LEGAL>    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, */

-  /* <LEGAL>    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, */

-  /* <LEGAL>    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR */

-  /* <LEGAL>    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF */

-  /* <LEGAL>    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */

-  /* <LEGAL>    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS */

-  /* <LEGAL>    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

-  do {

-    exitg1 = 0;

-    genrand_uint32_vector(mt, u);

-    r = 1.1102230246251565E-16 * ((real_T)(u[0] >> 5U) * 6.7108864E+7 + (real_T)

-                                  (u[1] >> 6U));

-    if (r == 0.0) {

-      if ((mt[624] >= 1U) && (mt[624] < 625U)) {

-        isvalid = TRUE;

-      } else {

-        isvalid = FALSE;

-      }

-

-      if (isvalid) {

-        isvalid = FALSE;

-        k = 1;

-        exitg2 = FALSE;

-        while ((exitg2 == FALSE) && (k < 625)) {

-          if (mt[k - 1] == 0U) {

-            k++;

-          } else {

-            isvalid = TRUE;

-            exitg2 = TRUE;

-          }

-        }

-      }

-

-      if (!isvalid) {

-        twister_state_vector(mt, 5489.0);

-      }

-    } else {

-      exitg1 = 1;

-    }

-  } while (exitg1 == 0);

-

-  return r;

-}

-

-static real_T eml_rand_mt19937ar(uint32_T e_state[625])

-{

-  real_T r;

-  int32_T exitg1;

-  uint32_T u32[2];

-  int32_T i;

-  static const real_T dv1[257] = { 0.0, 0.215241895984875, 0.286174591792068,

-    0.335737519214422, 0.375121332878378, 0.408389134611989, 0.43751840220787,

-    0.46363433679088, 0.487443966139235, 0.50942332960209, 0.529909720661557,

-    0.549151702327164, 0.567338257053817, 0.584616766106378, 0.601104617755991,

-    0.61689699000775, 0.63207223638606, 0.646695714894993, 0.660822574244419,

-    0.674499822837293, 0.687767892795788, 0.700661841106814, 0.713212285190975,

-    0.725446140909999, 0.737387211434295, 0.749056662017815, 0.760473406430107,

-    0.771654424224568, 0.782615023307232, 0.793369058840623, 0.80392911698997,

-    0.814306670135215, 0.824512208752291, 0.834555354086381, 0.844444954909153,

-    0.854189171008163, 0.863795545553308, 0.87327106808886, 0.882622229585165,

-    0.891855070732941, 0.900975224461221, 0.909987953496718, 0.91889818364959,

-    0.927710533401999, 0.936429340286575, 0.945058684468165, 0.953602409881086,

-    0.96206414322304, 0.970447311064224, 0.978755155294224, 0.986990747099062,

-    0.99515699963509, 1.00325667954467, 1.01129241744, 1.01926671746548,

-    1.02718196603564, 1.03504043983344, 1.04284431314415, 1.05059566459093,

-    1.05829648333067, 1.06594867476212, 1.07355406579244, 1.0811144097034,

-    1.08863139065398, 1.09610662785202, 1.10354167942464, 1.11093804601357,

-    1.11829717411934, 1.12562045921553, 1.13290924865253, 1.14016484436815,

-    1.14738850542085, 1.15458145035993, 1.16174485944561, 1.16887987673083,

-    1.17598761201545, 1.18306914268269, 1.19012551542669, 1.19715774787944,

-    1.20416683014438, 1.2111537262437, 1.21811937548548, 1.22506469375653,

-    1.23199057474614, 1.23889789110569, 1.24578749554863, 1.2526602218949,

-    1.25951688606371, 1.26635828701823, 1.27318520766536, 1.27999841571382,

-    1.28679866449324, 1.29358669373695, 1.30036323033084, 1.30712898903073,

-    1.31388467315022, 1.32063097522106, 1.32736857762793, 1.33409815321936,

-    1.3408203658964, 1.34753587118059, 1.35424531676263, 1.36094934303328,

-    1.36764858359748, 1.37434366577317, 1.38103521107586, 1.38772383568998,

-    1.39441015092814, 1.40109476367925, 1.4077782768464, 1.41446128977547,

-    1.42114439867531, 1.42782819703026, 1.43451327600589, 1.44120022484872,

-    1.44788963128058, 1.45458208188841, 1.46127816251028, 1.46797845861808,

-    1.47468355569786, 1.48139403962819, 1.48811049705745, 1.49483351578049,

-    1.50156368511546, 1.50830159628131, 1.51504784277671, 1.521803020761,

-    1.52856772943771, 1.53534257144151, 1.542128153229, 1.54892508547417,

-    1.55573398346918, 1.56255546753104, 1.56939016341512, 1.57623870273591,

-    1.58310172339603, 1.58997987002419, 1.59687379442279, 1.60378415602609,

-    1.61071162236983, 1.61765686957301, 1.62462058283303, 1.63160345693487,

-    1.63860619677555, 1.64562951790478, 1.65267414708306, 1.65974082285818,

-    1.66683029616166, 1.67394333092612, 1.68108070472517, 1.68824320943719,

-    1.69543165193456, 1.70264685479992, 1.7098896570713, 1.71716091501782,

-    1.72446150294804, 1.73179231405296, 1.73915426128591, 1.74654827828172,

-    1.75397532031767, 1.76143636531891, 1.76893241491127, 1.77646449552452,

-    1.78403365954944, 1.79164098655216, 1.79928758454972, 1.80697459135082,

-    1.81470317596628, 1.82247454009388, 1.83028991968276, 1.83815058658281,

-    1.84605785028518, 1.8540130597602, 1.86201760539967, 1.87007292107127,

-    1.878180486293, 1.88634182853678, 1.8945585256707, 1.90283220855043,

-    1.91116456377125, 1.91955733659319, 1.92801233405266, 1.93653142827569,

-    1.94511656000868, 1.95376974238465, 1.96249306494436, 1.97128869793366,

-    1.98015889690048, 1.98910600761744, 1.99813247135842, 2.00724083056053,

-    2.0164337349062, 2.02571394786385, 2.03508435372962, 2.04454796521753,

-    2.05410793165065, 2.06376754781173, 2.07353026351874, 2.0833996939983,

-    2.09337963113879, 2.10347405571488, 2.11368715068665, 2.12402331568952,

-    2.13448718284602, 2.14508363404789, 2.15581781987674, 2.16669518035431,

-    2.17772146774029, 2.18890277162636, 2.20024554661128, 2.21175664288416,

-    2.22344334009251, 2.23531338492992, 2.24737503294739, 2.25963709517379,

-    2.27210899022838, 2.28480080272449, 2.29772334890286, 2.31088825060137,

-    2.32430801887113, 2.33799614879653, 2.35196722737914, 2.36623705671729,

-    2.38082279517208, 2.39574311978193, 2.41101841390112, 2.42667098493715,

-    2.44272531820036, 2.4592083743347, 2.47614993967052, 2.49358304127105,

-    2.51154444162669, 2.53007523215985, 2.54922155032478, 2.56903545268184,

-    2.58957598670829, 2.61091051848882, 2.63311639363158, 2.65628303757674,

-    2.68051464328574, 2.70593365612306, 2.73268535904401, 2.76094400527999,

-    2.79092117400193, 2.82287739682644, 2.85713873087322, 2.89412105361341,

-    2.93436686720889, 2.97860327988184, 3.02783779176959, 3.08352613200214,

-    3.147889289518, 3.2245750520478, 3.32024473383983, 3.44927829856143,

-    3.65415288536101, 3.91075795952492 };

-

-  real_T u;

-  static const real_T dv2[257] = { 1.0, 0.977101701267673, 0.959879091800108,

-    0.9451989534423, 0.932060075959231, 0.919991505039348, 0.908726440052131,

-    0.898095921898344, 0.887984660755834, 0.878309655808918, 0.869008688036857,

-    0.860033621196332, 0.851346258458678, 0.842915653112205, 0.834716292986884,

-    0.826726833946222, 0.818929191603703, 0.811307874312656, 0.803849483170964,

-    0.796542330422959, 0.789376143566025, 0.782341832654803, 0.775431304981187,

-    0.768637315798486, 0.761953346836795, 0.755373506507096, 0.748892447219157,

-    0.742505296340151, 0.736207598126863, 0.729995264561476, 0.72386453346863,

-    0.717811932630722, 0.711834248878248, 0.705928501332754, 0.700091918136512,

-    0.694321916126117, 0.688616083004672, 0.682972161644995, 0.677388036218774,

-    0.671861719897082, 0.66639134390875, 0.660975147776663, 0.655611470579697,

-    0.650298743110817, 0.645035480820822, 0.639820277453057, 0.634651799287624,

-    0.629528779924837, 0.624450015547027, 0.619414360605834, 0.614420723888914,

-    0.609468064925773, 0.604555390697468, 0.599681752619125, 0.594846243767987,

-    0.590047996332826, 0.585286179263371, 0.580559996100791, 0.575868682972354,

-    0.571211506735253, 0.566587763256165, 0.561996775814525, 0.557437893618766,

-    0.552910490425833, 0.548413963255266, 0.543947731190026, 0.539511234256952,

-    0.535103932380458, 0.530725304403662, 0.526374847171684, 0.522052074672322,

-    0.517756517229756, 0.513487720747327, 0.509245245995748, 0.505028667943468,

-    0.500837575126149, 0.49667156905249, 0.492530263643869, 0.488413284705458,

-    0.484320269426683, 0.480250865909047, 0.476204732719506, 0.47218153846773,

-    0.468180961405694, 0.464202689048174, 0.460246417812843, 0.456311852678716,

-    0.452398706861849, 0.448506701507203, 0.444635565395739, 0.440785034665804,

-    0.436954852547985, 0.433144769112652, 0.429354541029442, 0.425583931338022,

-    0.421832709229496, 0.418100649837848, 0.414387534040891, 0.410693148270188,

-    0.407017284329473, 0.403359739221114, 0.399720314980197, 0.396098818515832,

-    0.392495061459315, 0.388908860018789, 0.385340034840077, 0.381788410873393,

-    0.378253817245619, 0.374736087137891, 0.371235057668239, 0.367750569779032,

-    0.364282468129004, 0.360830600989648, 0.357394820145781, 0.353974980800077,

-    0.350570941481406, 0.347182563956794, 0.343809713146851, 0.340452257044522,

-    0.337110066637006, 0.333783015830718, 0.330470981379163, 0.327173842813601,

-    0.323891482376391, 0.320623784956905, 0.317370638029914, 0.314131931596337,

-    0.310907558126286, 0.307697412504292, 0.30450139197665, 0.301319396100803,

-    0.298151326696685, 0.294997087799962, 0.291856585617095, 0.288729728482183,

-    0.285616426815502, 0.282516593083708, 0.279430141761638, 0.276356989295668,

-    0.273297054068577, 0.270250256365875, 0.267216518343561, 0.264195763997261,

-    0.261187919132721, 0.258192911337619, 0.255210669954662, 0.252241126055942,

-    0.249284212418529, 0.246339863501264, 0.24340801542275, 0.240488605940501,

-    0.237581574431238, 0.23468686187233, 0.231804410824339, 0.228934165414681,

-    0.226076071322381, 0.223230075763918, 0.220396127480152, 0.217574176724331,

-    0.214764175251174, 0.211966076307031, 0.209179834621125, 0.206405406397881,

-    0.203642749310335, 0.200891822494657, 0.198152586545776, 0.195425003514135,

-    0.192709036903589, 0.190004651670465, 0.187311814223801, 0.1846304924268,

-    0.181960655599523, 0.179302274522848, 0.176655321443735, 0.174019770081839,

-    0.171395595637506, 0.168782774801212, 0.166181285764482, 0.163591108232366,

-    0.161012223437511, 0.158444614155925, 0.15588826472448, 0.153343161060263,

-    0.150809290681846, 0.148286642732575, 0.145775208005994, 0.143274978973514,

-    0.140785949814445, 0.138308116448551, 0.135841476571254, 0.133386029691669,

-    0.130941777173644, 0.12850872228, 0.126086870220186, 0.123676228201597,

-    0.12127680548479, 0.11888861344291, 0.116511665625611, 0.114145977827839,

-    0.111791568163838, 0.109448457146812, 0.107116667774684, 0.104796225622487,

-    0.102487158941935, 0.10018949876881, 0.0979032790388625, 0.095628536713009,

-    0.093365311912691, 0.0911136480663738, 0.0888735920682759,

-    0.0866451944505581, 0.0844285095703535, 0.082223595813203,

-    0.0800305158146631, 0.0778493367020961, 0.0756801303589272,

-    0.0735229737139814, 0.0713779490588905, 0.0692451443970068,

-    0.0671246538277886, 0.065016577971243, 0.0629210244377582, 0.06083810834954,

-    0.0587679529209339, 0.0567106901062031, 0.0546664613248891,

-    0.0526354182767924, 0.0506177238609479, 0.0486135532158687,

-    0.0466230949019305, 0.0446465522512946, 0.0426841449164746,

-    0.0407361106559411, 0.0388027074045262, 0.0368842156885674,

-    0.0349809414617162, 0.0330932194585786, 0.0312214171919203,

-    0.0293659397581334, 0.0275272356696031, 0.0257058040085489,

-    0.0239022033057959, 0.0221170627073089, 0.0203510962300445,

-    0.0186051212757247, 0.0168800831525432, 0.0151770883079353,

-    0.0134974506017399, 0.0118427578579079, 0.0102149714397015,

-    0.00861658276939875, 0.00705087547137324, 0.00552240329925101,

-    0.00403797259336304, 0.00260907274610216, 0.0012602859304986,

-    0.000477467764609386 };

-

-  real_T x;

-  do {

-    exitg1 = 0;

-    genrand_uint32_vector(e_state, u32);

-    i = (int32_T)((u32[1] >> 24U) + 1U);

-    r = (((real_T)(u32[0] >> 3U) * 1.6777216E+7 + (real_T)((int32_T)u32[1] &

-           16777215)) * 2.2204460492503131E-16 - 1.0) * dv1[i];

-    if (fabs(r) <= dv1[i - 1]) {

-      exitg1 = 1;

-    } else if (i < 256) {

-      u = b_genrandu(e_state);

-      if (dv2[i] + u * (dv2[i - 1] - dv2[i]) < exp(-0.5 * r * r)) {

-        exitg1 = 1;

-      }

-    } else {

-      do {

-        u = b_genrandu(e_state);

-        x = log(u) * 0.273661237329758;

-        u = b_genrandu(e_state);

-      } while (!(-2.0 * log(u) > x * x));

-

-      if (r < 0.0) {

-        r = x - 3.65415288536101;

-      } else {

-        r = 3.65415288536101 - x;

-      }

-

-      exitg1 = 1;

-    }

-  } while (exitg1 == 0);

-

-  return r;

-}

-

-static real_T eml_rand_shr3cong(uint32_T e_state[2])

-{

-  real_T r;

-  uint32_T icng;

-  uint32_T jsr;

-  uint32_T ui;

-  int32_T j;

-  static const real_T dv0[65] = { 0.340945, 0.4573146, 0.5397793, 0.6062427,

-    0.6631691, 0.7136975, 0.7596125, 0.8020356, 0.8417227, 0.8792102, 0.9148948,

-    0.9490791, 0.9820005, 1.0138492, 1.044781, 1.0749254, 1.1043917, 1.1332738,

-    1.161653, 1.189601, 1.2171815, 1.2444516, 1.2714635, 1.298265, 1.3249008,

-    1.3514125, 1.3778399, 1.4042211, 1.4305929, 1.4569915, 1.4834527, 1.5100122,

-    1.5367061, 1.5635712, 1.5906454, 1.617968, 1.6455802, 1.6735255, 1.7018503,

-    1.7306045, 1.7598422, 1.7896223, 1.8200099, 1.851077, 1.8829044, 1.9155831,

-    1.9492166, 1.9839239, 2.0198431, 2.0571356, 2.095993, 2.136645, 2.1793713,

-    2.2245175, 2.2725186, 2.3239338, 2.3795008, 2.4402218, 2.5075117, 2.5834658,

-    2.6713916, 2.7769942, 2.7769942, 2.7769942, 2.7769942 };

-

-  real_T x;

-  real_T y;

-  real_T s;

-  icng = 69069U * e_state[0] + 1234567U;

-  jsr = e_state[1] ^ e_state[1] << 13U;

-  jsr ^= jsr >> 17U;

-  jsr ^= jsr << 5U;

-  ui = icng + jsr;

-  j = (int32_T)(ui & 63U);

-  r = (real_T)(int32_T)ui * 4.6566128730773926E-10 * dv0[j + 1];

-  if (fabs(r) <= dv0[j]) {

-  } else {

-    x = (fabs(r) - dv0[j]) / (dv0[j + 1] - dv0[j]);

-    icng = 69069U * icng + 1234567U;

-    jsr ^= jsr << 13U;

-    jsr ^= jsr >> 17U;

-    jsr ^= jsr << 5U;

-    y = (real_T)(int32_T)(icng + jsr) * 2.328306436538696E-10;

-    s = x + (0.5 + y);

-    if (s > 1.301198) {

-      if (r < 0.0) {

-        r = 0.4878992 * x - 0.4878992;

-      } else {

-        r = 0.4878992 - 0.4878992 * x;

-      }

-    } else if (s <= 0.9689279) {

-    } else {

-      s = 0.4878992 * x;

-      x = 0.4878992 - 0.4878992 * x;

-      if (0.5 + y > 12.67706 - 12.37586 * exp(-0.5 * (0.4878992 - s) * x)) {

-        if (r < 0.0) {

-          r = -(0.4878992 - s);

-        } else {

-          r = 0.4878992 - s;

-        }

-      } else if (exp(-0.5 * dv0[j + 1] * dv0[j + 1]) + (0.5 + y) * 0.01958303 /

-                 dv0[j + 1] <= exp(-0.5 * r * r)) {

-      } else {

-        do {

-          icng = 69069U * icng + 1234567U;

-          jsr ^= jsr << 13U;

-          jsr ^= jsr >> 17U;

-          jsr ^= jsr << 5U;

-          x = log(0.5 + (real_T)(int32_T)(icng + jsr) * 2.328306436538696E-10) /

-            2.776994;

-          icng = 69069U * icng + 1234567U;

-          jsr ^= jsr << 13U;

-          jsr ^= jsr >> 17U;

-          jsr ^= jsr << 5U;

-        } while (!(-2.0 * log(0.5 + (real_T)(int32_T)(icng + jsr) *

-                              2.328306436538696E-10) > x * x));

-

-        if (r < 0.0) {

-          r = x - 2.776994;

-        } else {

-          r = 2.776994 - x;

-        }

-      }

-    }

-  }

-

-  e_state[0] = icng;

-  e_state[1] = jsr;

-  return r;

-}

-

-static void genrand_uint32_vector(uint32_T mt[625], uint32_T u[2])

-{

-  int32_T i;

-  uint32_T mti;

-  int32_T kk;

-  uint32_T y;

-  uint32_T b_y;

-  uint32_T c_y;

-  uint32_T d_y;

-  for (i = 0; i < 2; i++) {

-    u[i] = 0U;

-  }

-

-  for (i = 0; i < 2; i++) {

-    mti = mt[624] + 1U;

-    if (mti >= 625U) {

-      for (kk = 0; kk < 227; kk++) {

-        y = (mt[kk] & 2147483648U) | (mt[1 + kk] & 2147483647U);

-        if ((int32_T)(y & 1U) == 0) {

-          b_y = y >> 1U;

-        } else {

-          b_y = y >> 1U ^ 2567483615U;

-        }

-

-        mt[kk] = mt[397 + kk] ^ b_y;

-      }

-

-      for (kk = 0; kk < 396; kk++) {

-        y = (mt[227 + kk] & 2147483648U) | (mt[228 + kk] & 2147483647U);

-        if ((int32_T)(y & 1U) == 0) {

-          c_y = y >> 1U;

-        } else {

-          c_y = y >> 1U ^ 2567483615U;

-        }

-

-        mt[227 + kk] = mt[kk] ^ c_y;

-      }

-

-      y = (mt[623] & 2147483648U) | (mt[0] & 2147483647U);

-      if ((int32_T)(y & 1U) == 0) {

-        d_y = y >> 1U;

-      } else {

-        d_y = y >> 1U ^ 2567483615U;

-      }

-

-      mt[623] = mt[396] ^ d_y;

-      mti = 1U;

-    }

-

-    y = mt[(int32_T)mti - 1];

-    mt[624] = mti;

-    y ^= y >> 11U;

-    y ^= y << 7U & 2636928640U;

-    y ^= y << 15U & 4022730752U;

-    y ^= y >> 18U;

-    u[i] = y;

-  }

-}

-

-static void genrandu(uint32_T s, uint32_T *e_state, real_T *r)

-{

-  int32_T hi;

-  uint32_T test1;

-  uint32_T test2;

-  hi = (int32_T)(s / 127773U);

-  test1 = 16807U * (s - (uint32_T)hi * 127773U);

-  test2 = 2836U * (uint32_T)hi;

-  if (test1 < test2) {

-    *e_state = (test1 - test2) + 2147483647U;

-  } else {

-    *e_state = test1 - test2;

-  }

-

-  *r = (real_T)*e_state * 4.6566128752457969E-10;

-}

-

-static void twister_state_vector(uint32_T mt[625], real_T seed)

-{

-  uint32_T r;

-  int32_T mti;

-  if (seed < 4.294967296E+9) {

-    if (seed >= 0.0) {

-      r = (uint32_T)seed;

-    } else {

-      r = 0U;

-    }

-  } else if (seed >= 4.294967296E+9) {

-    r = MAX_uint32_T;

-  } else {

-    r = 0U;

-  }

-

-  mt[0] = r;

-  for (mti = 0; mti < 623; mti++) {

-    r = (r ^ r >> 30U) * 1812433253U + (uint32_T)(1 + mti);

-    mt[1 + mti] = r;

-  }

-

-  mt[624] = 624U;

-}

-

-real_T randn(void)

-{

-  real_T r;

-  uint32_T e_state;

-  real_T t;

-  real_T b_r;

-  uint32_T f_state;

-  if (method == 0U) {

-    if (b_method == 4U) {

-      do {

-        genrandu(b_state, &e_state, &r);

-        genrandu(e_state, &b_state, &t);

-        b_r = 2.0 * r - 1.0;

-        t = 2.0 * t - 1.0;

-        t = t * t + b_r * b_r;

-      } while (!(t <= 1.0));

-

-      r = (2.0 * r - 1.0) * sqrt(-2.0 * log(t) / t);

-    } else if (b_method == 5U) {

-      r = eml_rand_shr3cong(c_state);

-    } else {

-      if (!state_not_empty) {

-        memset(&d_state[0], 0, 625U * sizeof(uint32_T));

-        twister_state_vector(d_state, 5489.0);

-        state_not_empty = TRUE;

-      }

-

-      r = eml_rand_mt19937ar(d_state);

-    }

-  } else if (method == 4U) {

-    e_state = state[0];

-    do {

-      genrandu(e_state, &f_state, &r);

-      genrandu(f_state, &e_state, &t);

-      b_r = 2.0 * r - 1.0;

-      t = 2.0 * t - 1.0;

-      t = t * t + b_r * b_r;

-    } while (!(t <= 1.0));

-

-    state[0] = e_state;

-    r = (2.0 * r - 1.0) * sqrt(-2.0 * log(t) / t);

-  } else {

-    r = eml_rand_shr3cong(state);

-  }

-

-  return r;

-}

-

-/* End of code generation (randn.c) */

diff --git a/src/modules/position_estimator_mc/codegen/randn.h b/src/modules/position_estimator_mc/codegen/randn.h
deleted file mode 100755
index 8a2aa9277..000000000
--- a/src/modules/position_estimator_mc/codegen/randn.h
+++ /dev/null
@@ -1,33 +0,0 @@
-/*

- * randn.h

- *

- * Code generation for function 'randn'

- *

- * C source code generated on: Tue Feb 19 15:26:32 2013

- *

- */

-

-#ifndef __RANDN_H__

-#define __RANDN_H__

-/* Include files */

-#include <math.h>

-#include <stddef.h>

-#include <stdlib.h>

-#include <string.h>

-#include "rt_nonfinite.h"

-

-#include "rtwtypes.h"

-#include "kalman_dlqe3_types.h"

-

-/* Type Definitions */

-

-/* Named Constants */

-

-/* Variable Declarations */

-

-/* Variable Definitions */

-

-/* Function Declarations */

-extern real_T randn(void);

-#endif

-/* End of code generation (randn.h) */

diff --git a/src/modules/position_estimator_mc/codegen/rtGetInf.c b/src/modules/position_estimator_mc/codegen/rtGetInf.c
deleted file mode 100755
index c6fa7884e..000000000
--- a/src/modules/position_estimator_mc/codegen/rtGetInf.c
+++ /dev/null
@@ -1,139 +0,0 @@
-/*
- * rtGetInf.c
- *
- * Code generation for function 'kalman_dlqe2'
- *
- * C source code generated on: Thu Feb 14 12:52:29 2013
- *
- */
-
-/*
- * Abstract:
- *       MATLAB for code generation function to initialize non-finite, Inf and MinusInf
- */
-#include "rtGetInf.h"
-#define NumBitsPerChar	8U
-
-/* Function: rtGetInf ==================================================
- * Abstract:
- * Initialize rtInf needed by the generated code.
- * Inf is initialized as non-signaling. Assumes IEEE.
- */
-real_T rtGetInf(void)
-{
-  size_t bitsPerReal = sizeof(real_T) * (NumBitsPerChar);
-  real_T inf = 0.0;
-  if (bitsPerReal == 32U) {
-    inf = rtGetInfF();
-  } else {
-    uint16_T one = 1U;
-    enum {
-      LittleEndian,
-      BigEndian
-    } machByteOrder = (*((uint8_T *) &one) == 1U) ? LittleEndian : BigEndian;
-    switch (machByteOrder) {
-     case LittleEndian:
-      {
-        union {
-          LittleEndianIEEEDouble bitVal;
-          real_T fltVal;
-        } tmpVal;
-
-        tmpVal.bitVal.words.wordH = 0x7FF00000U;
-        tmpVal.bitVal.words.wordL = 0x00000000U;
-        inf = tmpVal.fltVal;
-        break;
-      }
-
-     case BigEndian:
-      {
-        union {
-          BigEndianIEEEDouble bitVal;
-          real_T fltVal;
-        } tmpVal;
-
-        tmpVal.bitVal.words.wordH = 0x7FF00000U;
-        tmpVal.bitVal.words.wordL = 0x00000000U;
-        inf = tmpVal.fltVal;
-        break;
-      }
-    }
-  }
-
-  return inf;
-}
-
-/* Function: rtGetInfF ==================================================
- * Abstract:
- * Initialize rtInfF needed by the generated code.
- * Inf is initialized as non-signaling. Assumes IEEE.
- */
-real32_T rtGetInfF(void)
-{
-  IEEESingle infF;
-  infF.wordL.wordLuint = 0x7F800000U;
-  return infF.wordL.wordLreal;
-}
-
-/* Function: rtGetMinusInf ==================================================
- * Abstract:
- * Initialize rtMinusInf needed by the generated code.
- * Inf is initialized as non-signaling. Assumes IEEE.
- */
-real_T rtGetMinusInf(void)
-{
-  size_t bitsPerReal = sizeof(real_T) * (NumBitsPerChar);
-  real_T minf = 0.0;
-  if (bitsPerReal == 32U) {
-    minf = rtGetMinusInfF();
-  } else {
-    uint16_T one = 1U;
-    enum {
-      LittleEndian,
-      BigEndian
-    } machByteOrder = (*((uint8_T *) &one) == 1U) ? LittleEndian : BigEndian;
-    switch (machByteOrder) {
-     case LittleEndian:
-      {
-        union {
-          LittleEndianIEEEDouble bitVal;
-          real_T fltVal;
-        } tmpVal;
-
-        tmpVal.bitVal.words.wordH = 0xFFF00000U;
-        tmpVal.bitVal.words.wordL = 0x00000000U;
-        minf = tmpVal.fltVal;
-        break;
-      }
-
-     case BigEndian:
-      {
-        union {
-          BigEndianIEEEDouble bitVal;
-          real_T fltVal;
-        } tmpVal;
-
-        tmpVal.bitVal.words.wordH = 0xFFF00000U;
-        tmpVal.bitVal.words.wordL = 0x00000000U;
-        minf = tmpVal.fltVal;
-        break;
-      }
-    }
-  }
-
-  return minf;
-}
-
-/* Function: rtGetMinusInfF ==================================================
- * Abstract:
- * Initialize rtMinusInfF needed by the generated code.
- * Inf is initialized as non-signaling. Assumes IEEE.
- */
-real32_T rtGetMinusInfF(void)
-{
-  IEEESingle minfF;
-  minfF.wordL.wordLuint = 0xFF800000U;
-  return minfF.wordL.wordLreal;
-}
-
-/* End of code generation (rtGetInf.c) */
diff --git a/src/modules/position_estimator_mc/codegen/rtGetInf.h b/src/modules/position_estimator_mc/codegen/rtGetInf.h
deleted file mode 100755
index e7b2a2d1c..000000000
--- a/src/modules/position_estimator_mc/codegen/rtGetInf.h
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
- * rtGetInf.h
- *
- * Code generation for function 'kalman_dlqe2'
- *
- * C source code generated on: Thu Feb 14 12:52:29 2013
- *
- */
-
-#ifndef __RTGETINF_H__
-#define __RTGETINF_H__
-
-#include <stddef.h>
-#include "rtwtypes.h"
-#include "rt_nonfinite.h"
-
-extern real_T rtGetInf(void);
-extern real32_T rtGetInfF(void);
-extern real_T rtGetMinusInf(void);
-extern real32_T rtGetMinusInfF(void);
-
-#endif
-/* End of code generation (rtGetInf.h) */
diff --git a/src/modules/position_estimator_mc/codegen/rtGetNaN.c b/src/modules/position_estimator_mc/codegen/rtGetNaN.c
deleted file mode 100755
index 552770149..000000000
--- a/src/modules/position_estimator_mc/codegen/rtGetNaN.c
+++ /dev/null
@@ -1,96 +0,0 @@
-/*
- * rtGetNaN.c
- *
- * Code generation for function 'kalman_dlqe2'
- *
- * C source code generated on: Thu Feb 14 12:52:29 2013
- *
- */
-
-/*
- * Abstract:
- *       MATLAB for code generation function to initialize non-finite, NaN
- */
-#include "rtGetNaN.h"
-#define NumBitsPerChar	8U
-
-/* Function: rtGetNaN ==================================================
- * Abstract:
- * Initialize rtNaN needed by the generated code.
- * NaN is initialized as non-signaling. Assumes IEEE.
- */
-real_T rtGetNaN(void)
-{
-  size_t bitsPerReal = sizeof(real_T) * (NumBitsPerChar);
-  real_T nan = 0.0;
-  if (bitsPerReal == 32U) {
-    nan = rtGetNaNF();
-  } else {
-  uint16_T one = 1U;
-  enum {
-    LittleEndian,
-    BigEndian
-  } machByteOrder = (*((uint8_T *) &one) == 1U) ? LittleEndian : BigEndian;
-  switch (machByteOrder) {
-   case LittleEndian:
-    {
-      union {
-        LittleEndianIEEEDouble bitVal;
-        real_T fltVal;
-      } tmpVal;
-
-      tmpVal.bitVal.words.wordH = 0xFFF80000U;
-      tmpVal.bitVal.words.wordL = 0x00000000U;
-      nan = tmpVal.fltVal;
-      break;
-    }
-
-   case BigEndian:
-    {
-        union {
-          BigEndianIEEEDouble bitVal;
-          real_T fltVal;
-        } tmpVal;
-
-        tmpVal.bitVal.words.wordH = 0x7FFFFFFFU;
-        tmpVal.bitVal.words.wordL = 0xFFFFFFFFU;
-        nan = tmpVal.fltVal;
-        break;
-      }
-    }
-  }
-
-  return nan;
-}
-
-/* Function: rtGetNaNF ==================================================
- * Abstract:
- * Initialize rtNaNF needed by the generated code.
- * NaN is initialized as non-signaling. Assumes IEEE.
- */
-real32_T rtGetNaNF(void)
-{
-  IEEESingle nanF = { { 0 } };
-  uint16_T one = 1U;
-  enum {
-    LittleEndian,
-    BigEndian
-  } machByteOrder = (*((uint8_T *) &one) == 1U) ? LittleEndian : BigEndian;
-  switch (machByteOrder) {
-   case LittleEndian:
-    {
-      nanF.wordL.wordLuint = 0xFFC00000U;
-      break;
-    }
-
-   case BigEndian:
-    {
-      nanF.wordL.wordLuint = 0x7FFFFFFFU;
-      break;
-    }
-  }
-
-  return nanF.wordL.wordLreal;
-}
-
-/* End of code generation (rtGetNaN.c) */
diff --git a/src/modules/position_estimator_mc/codegen/rtGetNaN.h b/src/modules/position_estimator_mc/codegen/rtGetNaN.h
deleted file mode 100755
index 5acdd9790..000000000
--- a/src/modules/position_estimator_mc/codegen/rtGetNaN.h
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
- * rtGetNaN.h
- *
- * Code generation for function 'kalman_dlqe2'
- *
- * C source code generated on: Thu Feb 14 12:52:29 2013
- *
- */
-
-#ifndef __RTGETNAN_H__
-#define __RTGETNAN_H__
-
-#include <stddef.h>
-#include "rtwtypes.h"
-#include "rt_nonfinite.h"
-
-extern real_T rtGetNaN(void);
-extern real32_T rtGetNaNF(void);
-
-#endif
-/* End of code generation (rtGetNaN.h) */
diff --git a/src/modules/position_estimator_mc/codegen/rt_nonfinite.c b/src/modules/position_estimator_mc/codegen/rt_nonfinite.c
deleted file mode 100755
index de121c4a0..000000000
--- a/src/modules/position_estimator_mc/codegen/rt_nonfinite.c
+++ /dev/null
@@ -1,87 +0,0 @@
-/*
- * rt_nonfinite.c
- *
- * Code generation for function 'kalman_dlqe2'
- *
- * C source code generated on: Thu Feb 14 12:52:29 2013
- *
- */
-
-/*
- * Abstract:
- *      MATLAB for code generation function to initialize non-finites,
- *      (Inf, NaN and -Inf).
- */
-#include "rt_nonfinite.h"
-#include "rtGetNaN.h"
-#include "rtGetInf.h"
-
-real_T rtInf;
-real_T rtMinusInf;
-real_T rtNaN;
-real32_T rtInfF;
-real32_T rtMinusInfF;
-real32_T rtNaNF;
-
-/* Function: rt_InitInfAndNaN ==================================================
- * Abstract:
- * Initialize the rtInf, rtMinusInf, and rtNaN needed by the
- * generated code. NaN is initialized as non-signaling. Assumes IEEE.
- */
-void rt_InitInfAndNaN(size_t realSize)
-{
-  (void) (realSize);
-  rtNaN = rtGetNaN();
-  rtNaNF = rtGetNaNF();
-  rtInf = rtGetInf();
-  rtInfF = rtGetInfF();
-  rtMinusInf = rtGetMinusInf();
-  rtMinusInfF = rtGetMinusInfF();
-}
-
-/* Function: rtIsInf ==================================================
- * Abstract:
- * Test if value is infinite
- */
-boolean_T rtIsInf(real_T value)
-{
-  return ((value==rtInf || value==rtMinusInf) ? 1U : 0U);
-}
-
-/* Function: rtIsInfF =================================================
- * Abstract:
- * Test if single-precision value is infinite
- */
-boolean_T rtIsInfF(real32_T value)
-{
-  return(((value)==rtInfF || (value)==rtMinusInfF) ? 1U : 0U);
-}
-
-/* Function: rtIsNaN ==================================================
- * Abstract:
- * Test if value is not a number
- */
-boolean_T rtIsNaN(real_T value)
-{
-#if defined(_MSC_VER) && (_MSC_VER <= 1200)
-  return _isnan(value)? TRUE:FALSE;
-#else
-  return (value!=value)? 1U:0U;
-#endif
-}
-
-/* Function: rtIsNaNF =================================================
- * Abstract:
- * Test if single-precision value is not a number
- */
-boolean_T rtIsNaNF(real32_T value)
-{
-#if defined(_MSC_VER) && (_MSC_VER <= 1200)
-  return _isnan((real_T)value)? true:false;
-#else
-  return (value!=value)? 1U:0U;
-#endif
-}
-
-
-/* End of code generation (rt_nonfinite.c) */
diff --git a/src/modules/position_estimator_mc/codegen/rt_nonfinite.h b/src/modules/position_estimator_mc/codegen/rt_nonfinite.h
deleted file mode 100755
index 3bbcfd087..000000000
--- a/src/modules/position_estimator_mc/codegen/rt_nonfinite.h
+++ /dev/null
@@ -1,53 +0,0 @@
-/*
- * rt_nonfinite.h
- *
- * Code generation for function 'kalman_dlqe2'
- *
- * C source code generated on: Thu Feb 14 12:52:29 2013
- *
- */
-
-#ifndef __RT_NONFINITE_H__
-#define __RT_NONFINITE_H__
-
-#if defined(_MSC_VER) && (_MSC_VER <= 1200)
-#include <float.h>
-#endif
-#include <stddef.h>
-#include "rtwtypes.h"
-
-extern real_T rtInf;
-extern real_T rtMinusInf;
-extern real_T rtNaN;
-extern real32_T rtInfF;
-extern real32_T rtMinusInfF;
-extern real32_T rtNaNF;
-extern void rt_InitInfAndNaN(size_t realSize);
-extern boolean_T rtIsInf(real_T value);
-extern boolean_T rtIsInfF(real32_T value);
-extern boolean_T rtIsNaN(real_T value);
-extern boolean_T rtIsNaNF(real32_T value);
-
-typedef struct {
-  struct {
-    uint32_T wordH;
-    uint32_T wordL;
-  } words;
-} BigEndianIEEEDouble;
-
-typedef struct {
-  struct {
-    uint32_T wordL;
-    uint32_T wordH;
-  } words;
-} LittleEndianIEEEDouble;
-
-typedef struct {
-  union {
-    real32_T wordLreal;
-    uint32_T wordLuint;
-  } wordL;
-} IEEESingle;
-
-#endif
-/* End of code generation (rt_nonfinite.h) */
diff --git a/src/modules/position_estimator_mc/codegen/rtwtypes.h b/src/modules/position_estimator_mc/codegen/rtwtypes.h
deleted file mode 100755
index 8916e8572..000000000
--- a/src/modules/position_estimator_mc/codegen/rtwtypes.h
+++ /dev/null
@@ -1,159 +0,0 @@
-/*
- * rtwtypes.h
- *
- * Code generation for function 'kalman_dlqe2'
- *
- * C source code generated on: Thu Feb 14 12:52:29 2013
- *
- */
-
-#ifndef __RTWTYPES_H__
-#define __RTWTYPES_H__
-#ifndef TRUE
-# define TRUE (1U)
-#endif
-#ifndef FALSE
-# define FALSE (0U)
-#endif
-#ifndef __TMWTYPES__
-#define __TMWTYPES__
-
-#include <limits.h>
-
-/*=======================================================================* 
- * Target hardware information
- *   Device type: Generic->MATLAB Host Computer
- *   Number of bits:     char:   8    short:   16    int:  32
- *                       long:  32      native word size:  32
- *   Byte ordering: LittleEndian
- *   Signed integer division rounds to: Undefined
- *   Shift right on a signed integer as arithmetic shift: off
- *=======================================================================*/
-
-/*=======================================================================* 
- * Fixed width word size data types:                                     * 
- *   int8_T, int16_T, int32_T     - signed 8, 16, or 32 bit integers     * 
- *   uint8_T, uint16_T, uint32_T  - unsigned 8, 16, or 32 bit integers   * 
- *   real32_T, real64_T           - 32 and 64 bit floating point numbers * 
- *=======================================================================*/
-
-typedef signed char int8_T;
-typedef unsigned char uint8_T;
-typedef short int16_T;
-typedef unsigned short uint16_T;
-typedef int int32_T;
-typedef unsigned int uint32_T;
-typedef float real32_T;
-typedef double real64_T;
-
-/*===========================================================================* 
- * Generic type definitions: real_T, time_T, boolean_T, int_T, uint_T,       * 
- *                           ulong_T, char_T and byte_T.                     * 
- *===========================================================================*/
-
-typedef double real_T;
-typedef double time_T;
-typedef unsigned char boolean_T;
-typedef int int_T;
-typedef unsigned int uint_T;
-typedef unsigned long ulong_T;
-typedef char char_T;
-typedef char_T byte_T;
-
-/*===========================================================================* 
- * Complex number type definitions                                           * 
- *===========================================================================*/
-#define CREAL_T	
-   typedef struct {  
-     real32_T re;  
-     real32_T im;  
-   } creal32_T;  
-
-   typedef struct {  
-     real64_T re;  
-     real64_T im;  
-   } creal64_T;  
-
-   typedef struct {  
-     real_T re;  
-     real_T im;  
-   } creal_T;  
-
-   typedef struct {  
-     int8_T re;  
-     int8_T im;  
-   } cint8_T;  
-
-   typedef struct {  
-     uint8_T re;  
-     uint8_T im;  
-   } cuint8_T;  
-
-   typedef struct {  
-     int16_T re;  
-     int16_T im;  
-   } cint16_T;  
-
-   typedef struct {  
-     uint16_T re;  
-     uint16_T im;  
-   } cuint16_T;  
-
-   typedef struct {  
-     int32_T re;  
-     int32_T im;  
-   } cint32_T;  
-
-   typedef struct {  
-     uint32_T re;  
-     uint32_T im;  
-   } cuint32_T;  
-
-
-/*=======================================================================* 
- * Min and Max:                                                          * 
- *   int8_T, int16_T, int32_T     - signed 8, 16, or 32 bit integers     * 
- *   uint8_T, uint16_T, uint32_T  - unsigned 8, 16, or 32 bit integers   * 
- *=======================================================================*/
-
-#define MAX_int8_T  	((int8_T)(127))
-#define MIN_int8_T  	((int8_T)(-128))
-#define MAX_uint8_T 	((uint8_T)(255))
-#define MIN_uint8_T 	((uint8_T)(0))
-#define MAX_int16_T 	((int16_T)(32767))
-#define MIN_int16_T 	((int16_T)(-32768))
-#define MAX_uint16_T	((uint16_T)(65535))
-#define MIN_uint16_T	((uint16_T)(0))
-#define MAX_int32_T 	((int32_T)(2147483647))
-#define MIN_int32_T 	((int32_T)(-2147483647-1))
-#define MAX_uint32_T	((uint32_T)(0xFFFFFFFFU))
-#define MIN_uint32_T	((uint32_T)(0))
-
-/* Logical type definitions */
-#if !defined(__cplusplus) && !defined(__true_false_are_keywords)
-#  ifndef false
-#   define false (0U)
-#  endif
-#  ifndef true
-#   define true (1U)
-#  endif
-#endif
-
-/*
- * MATLAB for code generation assumes the code is compiled on a target using a 2's compliment representation
- * for signed integer values.
- */
-#if ((SCHAR_MIN + 1) != -SCHAR_MAX)
-#error "This code must be compiled using a 2's complement representation for signed integer values"
-#endif
-
-/*
- * Maximum length of a MATLAB identifier (function/variable)
- * including the null-termination character. Referenced by
- * rt_logging.c and rt_matrx.c.
- */
-#define TMW_NAME_LENGTH_MAX	64
-
-#endif
-#endif
-/* End of code generation (rtwtypes.h) */
diff --git a/src/modules/position_estimator_mc/kalman_dlqe1.m b/src/modules/position_estimator_mc/kalman_dlqe1.m
deleted file mode 100755
index ff939d029..000000000
--- a/src/modules/position_estimator_mc/kalman_dlqe1.m
+++ /dev/null
@@ -1,3 +0,0 @@
-function [x_aposteriori] = kalman_dlqe1(A,C,K,x_aposteriori_k,z)
-    x_aposteriori=A*x_aposteriori_k+K*(z-C*A*x_aposteriori_k);      
-end
\ No newline at end of file
diff --git a/src/modules/position_estimator_mc/kalman_dlqe2.m b/src/modules/position_estimator_mc/kalman_dlqe2.m
deleted file mode 100755
index 2a50164ef..000000000
--- a/src/modules/position_estimator_mc/kalman_dlqe2.m
+++ /dev/null
@@ -1,9 +0,0 @@
-function [x_aposteriori] = kalman_dlqe2(dt,k1,k2,k3,x_aposteriori_k,z)
-    st = 1/2*dt^2;
-    A = [1,dt,st;
-        0,1,dt;
-        0,0,1];
-    C=[1,0,0];
-    K = [k1;k2;k3];
-    x_aposteriori=A*x_aposteriori_k+K*(z-C*A*x_aposteriori_k);      
-end
\ No newline at end of file
diff --git a/src/modules/position_estimator_mc/kalman_dlqe3.m b/src/modules/position_estimator_mc/kalman_dlqe3.m
deleted file mode 100755
index 4c6421b7f..000000000
--- a/src/modules/position_estimator_mc/kalman_dlqe3.m
+++ /dev/null
@@ -1,17 +0,0 @@
-function [x_aposteriori] = kalman_dlqe3(dt,k1,k2,k3,x_aposteriori_k,z,posUpdate,addNoise,sigma)

-    st = 1/2*dt^2;

-    A = [1,dt,st;

-        0,1,dt;

-        0,0,1];

-    C=[1,0,0];

-    K = [k1;k2;k3];

-    if addNoise==1

-        noise = sigma*randn(1,1);

-        z = z + noise;

-    end

-    if(posUpdate)

-        x_aposteriori=A*x_aposteriori_k+K*(z-C*A*x_aposteriori_k);

-    else

-        x_aposteriori=A*x_aposteriori_k;

-    end

-end
\ No newline at end of file
diff --git a/src/modules/position_estimator_mc/module.mk b/src/modules/position_estimator_mc/module.mk
deleted file mode 100644
index 40b135ea4..000000000
--- a/src/modules/position_estimator_mc/module.mk
+++ /dev/null
@@ -1,60 +0,0 @@
-############################################################################
-#
-#   Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions
-# are met:
-#
-# 1. Redistributions of source code must retain the above copyright
-#    notice, this list of conditions and the following disclaimer.
-# 2. Redistributions in binary form must reproduce the above copyright
-#    notice, this list of conditions and the following disclaimer in
-#    the documentation and/or other materials provided with the
-#    distribution.
-# 3. Neither the name PX4 nor the names of its contributors may be
-#    used to endorse or promote products derived from this software
-#    without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
-# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
-# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-# POSSIBILITY OF SUCH DAMAGE.
-#
-############################################################################
-
-#
-# Makefile to build the position estimator
-#
-
-MODULE_COMMAND	 = position_estimator_mc
-
-SRCS		 = position_estimator_mc_main.c \
-			   position_estimator_mc_params.c \
-			   codegen/positionKalmanFilter1D_initialize.c \
-			   codegen/positionKalmanFilter1D_terminate.c \
-			   codegen/positionKalmanFilter1D.c \
-			   codegen/rt_nonfinite.c \
-			   codegen/rtGetInf.c \
-			   codegen/rtGetNaN.c \
-			   codegen/positionKalmanFilter1D_dT_initialize.c \
-			   codegen/positionKalmanFilter1D_dT_terminate.c \
-			   codegen/kalman_dlqe1.c \
-			   codegen/kalman_dlqe1_initialize.c \
-			   codegen/kalman_dlqe1_terminate.c \
-			   codegen/kalman_dlqe2.c \
-			   codegen/kalman_dlqe2_initialize.c \
-			   codegen/kalman_dlqe2_terminate.c \
-			   codegen/kalman_dlqe3.c \
-			   codegen/kalman_dlqe3_initialize.c \
-			   codegen/kalman_dlqe3_terminate.c \
-			   codegen/kalman_dlqe3_data.c \
-			   codegen/randn.c
diff --git a/src/modules/position_estimator_mc/positionKalmanFilter1D.m b/src/modules/position_estimator_mc/positionKalmanFilter1D.m
deleted file mode 100755
index 144ff8c7c..000000000
--- a/src/modules/position_estimator_mc/positionKalmanFilter1D.m
+++ /dev/null
@@ -1,19 +0,0 @@
-function [x_aposteriori,P_aposteriori]=positionKalmanFilter1D(A,B,C,x_aposteriori_k,P_aposteriori_k,u,z,gps_update,Q,R,thresh,decay)
-%prediction
-    x_apriori=A*x_aposteriori_k+B*u;
-    P_apriori=A*P_aposteriori_k*A'+Q;
-    if abs(u)<thresh
-        x_apriori(2)=decay*x_apriori(2);
-    end
-    %update
-    if gps_update==1
-        y=z-C*x_apriori;
-        S=C*P_apriori*C'+R;
-        K=(P_apriori*C')/S;
-        x_aposteriori=x_apriori+K*y;
-        P_aposteriori=(eye(size(P_apriori))-K*C)*P_apriori;
-    else
-        x_aposteriori=x_apriori;
-        P_aposteriori=P_apriori;
-    end
-end
diff --git a/src/modules/position_estimator_mc/positionKalmanFilter1D_dT.m b/src/modules/position_estimator_mc/positionKalmanFilter1D_dT.m
deleted file mode 100755
index f94cce1fb..000000000
--- a/src/modules/position_estimator_mc/positionKalmanFilter1D_dT.m
+++ /dev/null
@@ -1,26 +0,0 @@
-function  [x_aposteriori,P_aposteriori]=positionKalmanFilter1D_dT(dT,x_aposteriori_k,P_aposteriori_k,u,z,gps_update,Q,R,thresh,decay)
-    %dynamics
-    A = [1 dT -0.5*dT*dT;
-         0 1 -dT;
-         0 0 1];
-    B = [0.5*dT*dT; dT; 0];
-    C = [1 0 0];
-    %prediction
-    x_apriori=A*x_aposteriori_k+B*u;
-    P_apriori=A*P_aposteriori_k*A'+Q;
-    if abs(u)<thresh
-        x_apriori(2)=decay*x_apriori(2);
-    end
-    %update
-    if gps_update==1
-        y=z-C*x_apriori;
-        S=C*P_apriori*C'+R;
-        K=(P_apriori*C')/S;
-        x_aposteriori=x_apriori+K*y;
-        P_aposteriori=(eye(size(P_apriori))-K*C)*P_apriori;
-    else
-        x_aposteriori=x_apriori;
-        P_aposteriori=P_apriori;
-    end
-end
-
diff --git a/src/modules/position_estimator_mc/position_estimator_mc_main.c b/src/modules/position_estimator_mc/position_estimator_mc_main.c
deleted file mode 100755
index 363961819..000000000
--- a/src/modules/position_estimator_mc/position_estimator_mc_main.c
+++ /dev/null
@@ -1,515 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (C) 2008-2012 PX4 Development Team. All rights reserved.
- *   Author: 	Damian Aregger	<daregger@student.ethz.ch>
- *   			Tobias Naegeli <naegelit@student.ethz.ch>
-* 				Lorenz Meier <lm@inf.ethz.ch>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/**
- * @file position_estimator_main.c
- * Model-identification based position estimator for multirotors
- */
-
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdbool.h>
-#include <fcntl.h>
-#include <float.h>
-#include <string.h>
-#include <nuttx/config.h>
-#include <nuttx/sched.h>
-#include <sys/prctl.h>
-#include <termios.h>
-#include <errno.h>
-#include <limits.h>
-#include <math.h>
-#include <uORB/uORB.h>
-#include <uORB/topics/sensor_combined.h>
-#include <uORB/topics/parameter_update.h>
-#include <uORB/topics/vehicle_attitude.h>
-#include <uORB/topics/actuator_outputs.h>
-#include <uORB/topics/actuator_controls_effective.h>
-#include <uORB/topics/vehicle_status.h>
-#include <uORB/topics/vehicle_vicon_position.h>
-#include <uORB/topics/vehicle_local_position.h>
-#include <uORB/topics/vehicle_global_position.h>
-#include <uORB/topics/vehicle_local_position_setpoint.h>
-#include <uORB/topics/vehicle_gps_position.h>
-#include <mavlink/mavlink_log.h>
-#include <poll.h>
-#include <systemlib/geo/geo.h>
-#include <systemlib/err.h>
-#include <systemlib/systemlib.h>
-
-#include <drivers/drv_hrt.h>
-
-#include "position_estimator_mc_params.h"
-//#include <uORB/topics/debug_key_value.h>
-#include "codegen/kalman_dlqe2.h"
-#include "codegen/kalman_dlqe2_initialize.h"
-#include "codegen/kalman_dlqe3.h"
-#include "codegen/kalman_dlqe3_initialize.h"
-
-static bool thread_should_exit = false;	/**< Deamon exit flag */
-static bool thread_running = false;	/**< Deamon status flag */
-static int position_estimator_mc_task;	/**< Handle of deamon task / thread */
-
-__EXPORT int position_estimator_mc_main(int argc, char *argv[]);
-
-int position_estimator_mc_thread_main(int argc, char *argv[]);
-/**
- * Print the correct usage.
- */
-static void usage(const char *reason);
-
-static void
-usage(const char *reason)
-{
-	if (reason)
-		warnx("%s\n", reason);
-	warnx("usage: position_estimator_mc {start|stop|status}");
-	exit(1);
-}
-
-/**
- * The position_estimator_mc_thread only briefly exists to start
- * the background job. The stack size assigned in the
- * Makefile does only apply to this management task.
- *
- * The actual stack size should be set in the call
- * to task_create().
- */
-int position_estimator_mc_main(int argc, char *argv[])
-{
-	if (argc < 1)
-		usage("missing command");
-
-	if (!strcmp(argv[1], "start")) {
-
-		if (thread_running) {
-			printf("position_estimator_mc already running\n");
-			/* this is not an error */
-			exit(0);
-		}
-
-		thread_should_exit = false;
-		position_estimator_mc_task = task_spawn_cmd("position_estimator_mc",
-					 SCHED_RR,
-					 SCHED_PRIORITY_MAX - 5,
-					 4096,
-					 position_estimator_mc_thread_main,
-					 (argv) ? (const char **)&argv[2] : (const char **)NULL);
-		exit(0);
-	}
-	if (!strcmp(argv[1], "stop")) {
-		thread_should_exit = true;
-		exit(0);
-	}
-
-	if (!strcmp(argv[1], "status")) {
-		if (thread_running) {
-			warnx("position_estimator_mc is running");
-		} else {
-			warnx("position_estimator_mc not started");
-		}
-		exit(0);
-	}
-
-	usage("unrecognized command");
-	exit(1);
-}
-
-/****************************************************************************
- * main
- ****************************************************************************/
-int position_estimator_mc_thread_main(int argc, char *argv[])
-{
-	/* welcome user */
-	warnx("[position_estimator_mc] started");
-	int mavlink_fd;
-	mavlink_fd = open(MAVLINK_LOG_DEVICE, 0);
-	mavlink_log_info(mavlink_fd, "[position_estimator_mc] started");
-
-	/* initialize values */
-	float z[3] = {0, 0, 0}; /* output variables from tangent plane mapping */
-	// float rotMatrix[4] = {1.0f,  0.0f, 0.0f,  1.0f};
-	float x_x_aposteriori_k[3] = {1.0f, 0.0f, 0.0f};
-	float x_y_aposteriori_k[3] = {1.0f, 0.0f, 0.0f};
-	float x_z_aposteriori_k[3] = {1.0f, 0.0f, 0.0f};
-	float x_x_aposteriori[3] = {0.0f, 0.0f, 0.0f};
-	float x_y_aposteriori[3] = {1.0f, 0.0f, 0.0f};
-	float x_z_aposteriori[3] = {1.0f, 0.0f, 0.0f};
-
-	// XXX this is terribly wrong and should actual dT instead
-	const float dT_const_50 = 1.0f/50.0f;
-
-	float addNoise = 0.0f;
-	float sigma = 0.0f;
-	//computed from dlqe in matlab
-	const float K_vicon_50Hz[3] = {0.5297f, 0.9873f, 0.9201f};
-	// XXX implement baro filter
-	const float K_baro[3] = {0.0248f, 0.0377f, 0.0287f};
-	float K[3] = {0.0f, 0.0f, 0.0f};
-	int baro_loop_cnt = 0;
-	int baro_loop_end = 70; /* measurement for 1 second */
-	float p0_Pa = 0.0f; /* to determin while start up */
-	float rho0 = 1.293f; /* standard pressure */
-	const float const_earth_gravity = 9.81f;
-
-	float posX = 0.0f;
-	float posY = 0.0f;
-	float posZ = 0.0f;
-
-	double lat_current;
-	double lon_current;
-	float alt_current;
-
-	float gps_origin_altitude = 0.0f;
-
-	/* Initialize filter */
-	kalman_dlqe2_initialize();
-	kalman_dlqe3_initialize();
-
-	/* declare and safely initialize all structs */
-	struct sensor_combined_s sensor;
-	memset(&sensor, 0, sizeof(sensor));
-	struct vehicle_attitude_s att;
-	memset(&att, 0, sizeof(att));
-	struct vehicle_status_s vehicle_status;
-	memset(&vehicle_status, 0, sizeof(vehicle_status)); /* make sure that baroINITdone = false */
-	struct vehicle_vicon_position_s vicon_pos;
-	memset(&vicon_pos, 0, sizeof(vicon_pos));
-	struct actuator_controls_effective_s act_eff;
-	memset(&act_eff, 0, sizeof(act_eff));
-	struct vehicle_gps_position_s gps;
-	memset(&gps, 0, sizeof(gps));
-	struct vehicle_local_position_s local_pos_est;
-	memset(&local_pos_est, 0, sizeof(local_pos_est));
-	struct vehicle_global_position_s global_pos_est;
-	memset(&global_pos_est, 0, sizeof(global_pos_est));
-
-	/* subscribe */
-	int sensor_sub = orb_subscribe(ORB_ID(sensor_combined));
-	int sub_params = orb_subscribe(ORB_ID(parameter_update));
-	int vehicle_attitude_sub = orb_subscribe(ORB_ID(vehicle_attitude));
-	int vicon_pos_sub = orb_subscribe(ORB_ID(vehicle_vicon_position));
-	int actuator_eff_sub = orb_subscribe(ORB_ID(actuator_controls_effective_0));
-	int vehicle_gps_sub = orb_subscribe(ORB_ID(vehicle_gps_position));
-	int vehicle_status_sub = orb_subscribe(ORB_ID(vehicle_status));
-
-	/* advertise */
-	orb_advert_t local_pos_est_pub = 0;
-	orb_advert_t global_pos_est_pub = 0;
-
-	struct position_estimator_mc_params pos1D_params;
-	struct position_estimator_mc_param_handles pos1D_param_handles;
-	/* initialize parameter handles */
-	parameters_init(&pos1D_param_handles);
-
-	bool flag_use_gps = false;
-	bool flag_use_baro = false;
-	bool flag_baro_initialized = false; /* in any case disable baroINITdone */
-	/* FIRST PARAMETER READ at START UP*/
-	struct parameter_update_s update;
-	orb_copy(ORB_ID(parameter_update), sub_params, &update); /* read from param to clear updated flag */
-	/* FIRST PARAMETER UPDATE */
-	parameters_update(&pos1D_param_handles, &pos1D_params);
-	flag_use_baro = pos1D_params.baro;
-	sigma = pos1D_params.sigma;
-	addNoise = pos1D_params.addNoise;
-	/* END FIRST PARAMETER UPDATE */
-
-	/* try to grab a vicon message - if it fails, go for GPS. */
-
-	/* make sure the next orb_check() can't return true unless we get a timely update */
-	orb_copy(ORB_ID(vehicle_vicon_position), vicon_pos_sub, &vicon_pos);
-	/* allow 200 ms for vicon to come in */
-	usleep(200000);
-	/* check if we got vicon */
-	bool update_check;
-	orb_check(vicon_pos_sub, &update_check);
-	/* if no update was available, use GPS */
-	flag_use_gps = !update_check;
-
-	if (flag_use_gps) {
-		mavlink_log_info(mavlink_fd, "[pos_est_mc] GPS locked");
-		/* wait until gps signal turns valid, only then can we initialize the projection */
-
-		// XXX magic number
-		float hdop_threshold_m = 4.0f;
-		float vdop_threshold_m = 8.0f;
-
-		/*
-		 * If horizontal dilution of precision (hdop / eph)
-		 * and vertical diluation of precision (vdop / epv)
-		 * are below a certain threshold (e.g. 4 m), AND
-		 * home position is not yet set AND the last GPS
-		 * GPS measurement is not older than two seconds AND
-		 * the system is currently not armed, set home
-		 * position to the current position.
-		 */
-
-		while (!(gps.fix_type == 3
-			&& (gps.eph_m < hdop_threshold_m)
-			&& (gps.epv_m < vdop_threshold_m)
-			&& (hrt_absolute_time() - gps.timestamp_position < 2000000))) {
-
-			struct pollfd fds1[2] = {
-					{ .fd = vehicle_gps_sub, .events = POLLIN },
-					{ .fd = sub_params,   .events = POLLIN },
-			};
-
-			/* wait for GPS updates, BUT READ VEHICLE STATUS (!)
-			 * this choice is critical, since the vehicle status might not
-			 * actually change, if this app is started after GPS lock was
-			 * aquired.
-			 */
-			if (poll(fds1, 2, 5000)) {
-				if (fds1[0].revents & POLLIN){
-					/* Read gps position */
-					orb_copy(ORB_ID(vehicle_gps_position), vehicle_gps_sub, &gps);
-				}
-				if (fds1[1].revents & POLLIN){
-					/* Read out parameters to check for an update there, e.g. useGPS variable */
-					/* read from param to clear updated flag */
-					struct parameter_update_s updated;
-					orb_copy(ORB_ID(parameter_update), sub_params, &updated);
-					/* update parameters */
-					parameters_update(&pos1D_param_handles, &pos1D_params);
-				}
-			}
-			static int printcounter = 0;
-			if (printcounter == 100) {
-				printcounter = 0;
-				warnx("[pos_est_mc] wait for GPS fix");
-			}
-			printcounter++;
-		}
-
-		/* get gps value for first initialization */
-		orb_copy(ORB_ID(vehicle_gps_position), vehicle_gps_sub, &gps);
-		lat_current = ((double)(gps.lat)) * 1e-7d;
-		lon_current = ((double)(gps.lon)) * 1e-7d;
-		alt_current = gps.alt * 1e-3f;
-		gps_origin_altitude = alt_current;
-		/* initialize coordinates */
-		map_projection_init(lat_current, lon_current);
-		/* publish global position messages only after first GPS message */
-		printf("[pos_est_mc] initialized projection with: lat: %.10f,  lon:%.10f\n", lat_current, lon_current);
-
-	} else {
-		mavlink_log_info(mavlink_fd, "[pos_est_mc] I'm NOT using GPS - I use VICON");
-		/* onboard calculated position estimations */
-	}
-	thread_running = true;
-
-	struct pollfd fds2[3] = {
-		{ .fd = vehicle_gps_sub,   .events = POLLIN },
-		{ .fd = vicon_pos_sub,   .events = POLLIN },
-		{ .fd = sub_params,   .events = POLLIN },
-	};
-
-	bool vicon_updated = false;
-	bool gps_updated = false;
-
-	/**< main_loop */
-	while (!thread_should_exit) {
-		int ret = poll(fds2, 3, 20);  //wait maximal this 20 ms = 50 Hz minimum rate
-		if (ret < 0) {
-			/* poll error */
-		} else {
-			if (fds2[2].revents & POLLIN){
-				/* new parameter */
-				/* read from param to clear updated flag */
-				struct parameter_update_s updated;
-				orb_copy(ORB_ID(parameter_update), sub_params, &updated);
-				/* update parameters */
-				parameters_update(&pos1D_param_handles, &pos1D_params);
-				flag_use_baro = pos1D_params.baro;
-				sigma = pos1D_params.sigma;
-				addNoise = pos1D_params.addNoise;
-			}
-			vicon_updated = false; /* default is no vicon_updated */
-			if (fds2[1].revents & POLLIN) {
-				/* new vicon position */
-				orb_copy(ORB_ID(vehicle_vicon_position), vicon_pos_sub, &vicon_pos);
-				posX = vicon_pos.x;
-				posY = vicon_pos.y;
-				posZ = vicon_pos.z;
-				vicon_updated = true; /* set flag for vicon update */
-			} /* end of poll call for vicon updates */
-			gps_updated = false;
-			if (fds2[0].revents & POLLIN) {
-				/* new GPS value */
-				orb_copy(ORB_ID(vehicle_gps_position), vehicle_gps_sub, &gps);
-				/* Project gps lat lon (Geographic coordinate system) to plane*/
-				map_projection_project(((double)(gps.lat)) * 1e-7d, ((double)(gps.lon)) * 1e-7d, &(z[0]), &(z[1]));
-				posX = z[0];
-				posY = z[1];
-				posZ = (float)(gps.alt * 1e-3f);
-				gps_updated = true;
-			}
-
-			/* Main estimator loop */
-			orb_copy(ORB_ID(actuator_controls_effective_0), actuator_eff_sub, &act_eff);
-			orb_copy(ORB_ID(vehicle_attitude), vehicle_attitude_sub, &att);
-			orb_copy(ORB_ID(vehicle_status), vehicle_status_sub, &vehicle_status);
-			orb_copy(ORB_ID(sensor_combined), sensor_sub, &sensor);
-			// barometric pressure estimation at start up
-			if (!flag_baro_initialized){
-				// mean calculation over several measurements
-				if (baro_loop_cnt<baro_loop_end) {
-					p0_Pa += (sensor.baro_pres_mbar*100);
-					baro_loop_cnt++;
-				} else {
-					p0_Pa /= (float)(baro_loop_cnt);
-					flag_baro_initialized = true;
-					char *baro_m_start = "barometer initialized with p0 = ";
-					char p0_char[15];
-					sprintf(p0_char, "%8.2f", (double)(p0_Pa/100));
-					char *baro_m_end = " mbar";
-					char str[80];
-					strcpy(str,baro_m_start);
-					strcat(str,p0_char);
-					strcat(str,baro_m_end);
-					mavlink_log_info(mavlink_fd, str);
-				}
-			}
-			if (flag_use_gps) {
-				/* initialize map projection with the last estimate (not at full rate) */
-				if (gps.fix_type > 2) {
-					/* x-y-position/velocity estimation in earth frame = gps frame */
-					kalman_dlqe3(dT_const_50,K_vicon_50Hz[0],K_vicon_50Hz[1],K_vicon_50Hz[2],x_x_aposteriori_k,posX,gps_updated,0.0f,0.0f,x_x_aposteriori);
-					memcpy(x_x_aposteriori_k, x_x_aposteriori, sizeof(x_x_aposteriori));
-					kalman_dlqe3(dT_const_50,K_vicon_50Hz[0],K_vicon_50Hz[1],K_vicon_50Hz[2],x_y_aposteriori_k,posY,gps_updated,0.0f,0.0f,x_y_aposteriori);
-					memcpy(x_y_aposteriori_k, x_y_aposteriori, sizeof(x_y_aposteriori));
-					/* z-position/velocity estimation in earth frame = vicon frame */
-					float z_est = 0.0f;
-					if (flag_baro_initialized && flag_use_baro) {
-						z_est = -p0_Pa*logf(p0_Pa/(sensor.baro_pres_mbar*100))/(rho0*const_earth_gravity);
-						K[0] = K_vicon_50Hz[0];
-						K[1] = K_vicon_50Hz[1];
-						K[2] = K_vicon_50Hz[2];
-						gps_updated = 1.0f; /* always enable the update, cause baro update = 200 Hz */
-					} else {
-						z_est = posZ;
-						K[0] = K_vicon_50Hz[0];
-						K[1] = K_vicon_50Hz[1];
-						K[2] = K_vicon_50Hz[2];
-					}
-
-					kalman_dlqe3(dT_const_50,K[0],K[1],K[2],x_z_aposteriori_k,z_est,gps_updated,0.0f,0.0f,x_z_aposteriori);
-					memcpy(x_z_aposteriori_k, x_z_aposteriori, sizeof(x_z_aposteriori));
-					local_pos_est.x = x_x_aposteriori_k[0];
-					local_pos_est.vx = x_x_aposteriori_k[1];
-					local_pos_est.y = x_y_aposteriori_k[0];
-					local_pos_est.vy = x_y_aposteriori_k[1];
-					local_pos_est.z = x_z_aposteriori_k[0];
-					local_pos_est.vz = x_z_aposteriori_k[1];
-					local_pos_est.timestamp = hrt_absolute_time();
-					if ((isfinite(x_x_aposteriori_k[0])) && (isfinite(x_x_aposteriori_k[1])) && (isfinite(x_y_aposteriori_k[0])) && (isfinite(x_y_aposteriori_k[1])) && (isfinite(x_z_aposteriori_k[0])) && (isfinite(x_z_aposteriori_k[1]))) {
-						/* publish local position estimate */
-						if (local_pos_est_pub > 0) {
-							orb_publish(ORB_ID(vehicle_local_position), local_pos_est_pub, &local_pos_est);
-						} else {
-							local_pos_est_pub = orb_advertise(ORB_ID(vehicle_local_position), &local_pos_est);
-						}
-						/* publish on GPS updates */
-						if (gps_updated) {
-
-							double lat, lon;
-							float alt = z_est + gps_origin_altitude;
-
-							map_projection_reproject(local_pos_est.x, local_pos_est.y, &lat, &lon);
-
-							global_pos_est.lat = lat;
-							global_pos_est.lon = lon;
-							global_pos_est.alt = alt;
-
-							if (global_pos_est_pub > 0) {
-								orb_publish(ORB_ID(vehicle_global_position), global_pos_est_pub, &global_pos_est);
-							} else {
-								global_pos_est_pub = orb_advertise(ORB_ID(vehicle_global_position), &global_pos_est);
-							}
-						}
-					}
-				}
-			} else {
-				/* x-y-position/velocity estimation in earth frame = vicon frame */
-				kalman_dlqe3(dT_const_50,K_vicon_50Hz[0],K_vicon_50Hz[1],K_vicon_50Hz[2],x_x_aposteriori_k,posX,vicon_updated,addNoise,sigma,x_x_aposteriori);
-				memcpy(x_x_aposteriori_k, x_x_aposteriori, sizeof(x_x_aposteriori));
-				kalman_dlqe3(dT_const_50,K_vicon_50Hz[0],K_vicon_50Hz[1],K_vicon_50Hz[2],x_y_aposteriori_k,posY,vicon_updated,addNoise,sigma,x_y_aposteriori);
-				memcpy(x_y_aposteriori_k, x_y_aposteriori, sizeof(x_y_aposteriori));
-				/* z-position/velocity estimation in earth frame = vicon frame */
-				float z_est = 0.0f;
-				float local_sigma = 0.0f;
-				if (flag_baro_initialized && flag_use_baro) {
-					z_est = -p0_Pa*logf(p0_Pa/(sensor.baro_pres_mbar*100.0f))/(rho0*const_earth_gravity);
-					K[0] = K_vicon_50Hz[0];
-					K[1] = K_vicon_50Hz[1];
-					K[2] = K_vicon_50Hz[2];
-					vicon_updated = 1; /* always enable the update, cause baro update = 200 Hz */
-					local_sigma = 0.0f; /* don't add noise on barometer in any case */
-				} else {
-					z_est = posZ;
-					K[0] = K_vicon_50Hz[0];
-					K[1] = K_vicon_50Hz[1];
-					K[2] = K_vicon_50Hz[2];
-					local_sigma = sigma;
-				}
-				kalman_dlqe3(dT_const_50,K[0],K[1],K[2],x_z_aposteriori_k,z_est,vicon_updated,addNoise,local_sigma,x_z_aposteriori);
-				memcpy(x_z_aposteriori_k, x_z_aposteriori, sizeof(x_z_aposteriori));
-				local_pos_est.x = x_x_aposteriori_k[0];
-				local_pos_est.vx = x_x_aposteriori_k[1];
-				local_pos_est.y = x_y_aposteriori_k[0];
-				local_pos_est.vy = x_y_aposteriori_k[1];
-				local_pos_est.z = x_z_aposteriori_k[0];
-				local_pos_est.vz = x_z_aposteriori_k[1];
-				local_pos_est.timestamp = hrt_absolute_time();
-				if ((isfinite(x_x_aposteriori_k[0])) && (isfinite(x_x_aposteriori_k[1])) && (isfinite(x_y_aposteriori_k[0])) && (isfinite(x_y_aposteriori_k[1])) && (isfinite(x_z_aposteriori_k[0])) && (isfinite(x_z_aposteriori_k[1]))){
-					if(local_pos_est_pub > 0)
-						orb_publish(ORB_ID(vehicle_local_position), local_pos_est_pub, &local_pos_est);
-					else
-						local_pos_est_pub = orb_advertise(ORB_ID(vehicle_local_position), &local_pos_est);
-					//char buf[0xff]; sprintf(buf,"[pos_est_mc] x:%f, y:%f, z:%f",x_x_aposteriori_k[0],x_y_aposteriori_k[0],x_z_aposteriori_k[0]);
-					//mavlink_log_info(mavlink_fd, buf);
-				}
-			}
-		} /* end of poll return value check */
-	}
-
-	printf("[pos_est_mc] exiting.\n");
-	mavlink_log_info(mavlink_fd, "[pos_est_mc] exiting");
-	thread_running = false;
-	return 0;
-}
diff --git a/src/modules/px4iofirmware/controls.c b/src/modules/px4iofirmware/controls.c
index 941500f0d..62e6b12cb 100644
--- a/src/modules/px4iofirmware/controls.c
+++ b/src/modules/px4iofirmware/controls.c
@@ -134,8 +134,6 @@ controls_tick() {
 
 	perf_begin(c_gather_sbus);
 
-	bool sbus_status = (r_status_flags & PX4IO_P_STATUS_FLAGS_RC_SBUS);
-
 	bool sbus_failsafe, sbus_frame_drop;
 	bool sbus_updated = sbus_input(r_raw_rc_values, &r_raw_rc_count, &sbus_failsafe, &sbus_frame_drop, PX4IO_RC_INPUT_CHANNELS);
 
@@ -201,94 +199,105 @@ controls_tick() {
 		/* update RC-received timestamp */
 		system_state.rc_channels_timestamp_received = hrt_absolute_time();
 
-		/* do not command anything in failsafe, kick in the RC loss counter */
-		if (!(r_raw_rc_flags & PX4IO_P_RAW_RC_FLAGS_FAILSAFE)) {
-
-			/* update RC-received timestamp */
-			system_state.rc_channels_timestamp_valid = system_state.rc_channels_timestamp_received;
-
-			/* map raw inputs to mapped inputs */
-			/* XXX mapping should be atomic relative to protocol */
-			for (unsigned i = 0; i < r_raw_rc_count; i++) {
-
-				/* map the input channel */
-				uint16_t *conf = &r_page_rc_input_config[i * PX4IO_P_RC_CONFIG_STRIDE];
-
-				if (conf[PX4IO_P_RC_CONFIG_OPTIONS] & PX4IO_P_RC_CONFIG_OPTIONS_ENABLED) {
-
-					uint16_t raw = r_raw_rc_values[i];
-
-					int16_t scaled;
-
-					/*
-					 * 1) Constrain to min/max values, as later processing depends on bounds.
-					 */
-					if (raw < conf[PX4IO_P_RC_CONFIG_MIN])
-						raw = conf[PX4IO_P_RC_CONFIG_MIN];
-					if (raw > conf[PX4IO_P_RC_CONFIG_MAX])
-						raw = conf[PX4IO_P_RC_CONFIG_MAX];
-
-					/*
-					 * 2) Scale around the mid point differently for lower and upper range.
-					 *
-					 * This is necessary as they don't share the same endpoints and slope.
-					 *
-					 * First normalize to 0..1 range with correct sign (below or above center),
-					 * then scale to 20000 range (if center is an actual center, -10000..10000,
-					 * if parameters only support half range, scale to 10000 range, e.g. if
-					 * center == min 0..10000, if center == max -10000..0).
-					 *
-					 * As the min and max bounds were enforced in step 1), division by zero
-					 * cannot occur, as for the case of center == min or center == max the if
-					 * statement is mutually exclusive with the arithmetic NaN case.
-					 *
-					 * DO NOT REMOVE OR ALTER STEP 1!
-					 */
-					if (raw > (conf[PX4IO_P_RC_CONFIG_CENTER] + conf[PX4IO_P_RC_CONFIG_DEADZONE])) {
-						scaled = 10000.0f * ((raw - conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE]) / (float)(conf[PX4IO_P_RC_CONFIG_MAX] - conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE]));
-
-					} else if (raw < (conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE])) {
-						scaled = 10000.0f * ((raw - conf[PX4IO_P_RC_CONFIG_CENTER] + conf[PX4IO_P_RC_CONFIG_DEADZONE]) / (float)(conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE] - conf[PX4IO_P_RC_CONFIG_MIN]));
-
-					} else {
-						/* in the configured dead zone, output zero */
-						scaled = 0;
-					}
-
-					/* invert channel if requested */
-					if (conf[PX4IO_P_RC_CONFIG_OPTIONS] & PX4IO_P_RC_CONFIG_OPTIONS_REVERSE)
-						scaled = -scaled;
+		/* update RC-received timestamp */
+		system_state.rc_channels_timestamp_valid = system_state.rc_channels_timestamp_received;
+
+		/* map raw inputs to mapped inputs */
+		/* XXX mapping should be atomic relative to protocol */
+		for (unsigned i = 0; i < r_raw_rc_count; i++) {
+
+			/* map the input channel */
+			uint16_t *conf = &r_page_rc_input_config[i * PX4IO_P_RC_CONFIG_STRIDE];
+
+			if (conf[PX4IO_P_RC_CONFIG_OPTIONS] & PX4IO_P_RC_CONFIG_OPTIONS_ENABLED) {
+
+				uint16_t raw = r_raw_rc_values[i];
+
+				int16_t scaled;
+
+				/*
+				 * 1) Constrain to min/max values, as later processing depends on bounds.
+				 */
+				if (raw < conf[PX4IO_P_RC_CONFIG_MIN])
+					raw = conf[PX4IO_P_RC_CONFIG_MIN];
+				if (raw > conf[PX4IO_P_RC_CONFIG_MAX])
+					raw = conf[PX4IO_P_RC_CONFIG_MAX];
+
+				/*
+				 * 2) Scale around the mid point differently for lower and upper range.
+				 *
+				 * This is necessary as they don't share the same endpoints and slope.
+				 *
+				 * First normalize to 0..1 range with correct sign (below or above center),
+				 * then scale to 20000 range (if center is an actual center, -10000..10000,
+				 * if parameters only support half range, scale to 10000 range, e.g. if
+				 * center == min 0..10000, if center == max -10000..0).
+				 *
+				 * As the min and max bounds were enforced in step 1), division by zero
+				 * cannot occur, as for the case of center == min or center == max the if
+				 * statement is mutually exclusive with the arithmetic NaN case.
+				 *
+				 * DO NOT REMOVE OR ALTER STEP 1!
+				 */
+				if (raw > (conf[PX4IO_P_RC_CONFIG_CENTER] + conf[PX4IO_P_RC_CONFIG_DEADZONE])) {
+					scaled = 10000.0f * ((raw - conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE]) / (float)(conf[PX4IO_P_RC_CONFIG_MAX] - conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE]));
+
+				} else if (raw < (conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE])) {
+					scaled = 10000.0f * ((raw - conf[PX4IO_P_RC_CONFIG_CENTER] + conf[PX4IO_P_RC_CONFIG_DEADZONE]) / (float)(conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE] - conf[PX4IO_P_RC_CONFIG_MIN]));
+
+				} else {
+					/* in the configured dead zone, output zero */
+					scaled = 0;
+				}
 
-					/* and update the scaled/mapped version */
-					unsigned mapped = conf[PX4IO_P_RC_CONFIG_ASSIGNMENT];
-					if (mapped < PX4IO_CONTROL_CHANNELS) {
+				/* invert channel if requested */
+				if (conf[PX4IO_P_RC_CONFIG_OPTIONS] & PX4IO_P_RC_CONFIG_OPTIONS_REVERSE) {
+					scaled = -scaled;
+				}
 
-						/* invert channel if pitch - pulling the lever down means pitching up by convention */
-						if (mapped == 1) /* roll, pitch, yaw, throttle, override is the standard order */
-							scaled = -scaled;
+				/* and update the scaled/mapped version */
+				unsigned mapped = conf[PX4IO_P_RC_CONFIG_ASSIGNMENT];
+				if (mapped < PX4IO_CONTROL_CHANNELS) {
 
-						r_rc_values[mapped] = SIGNED_TO_REG(scaled);
-						assigned_channels |= (1 << mapped);
+					/* invert channel if pitch - pulling the lever down means pitching up by convention */
+					if (mapped == 1) {
+						/* roll, pitch, yaw, throttle, override is the standard order */
+						scaled = -scaled;
+					}
 
+					if (mapped == 3 && r_setup_rc_thr_failsafe) {
+						/* throttle failsafe detection */
+						if (((raw < conf[PX4IO_P_RC_CONFIG_MIN]) && (raw < r_setup_rc_thr_failsafe)) ||
+						    ((raw > conf[PX4IO_P_RC_CONFIG_MAX]) && (raw > r_setup_rc_thr_failsafe))) {
+							r_raw_rc_flags |= PX4IO_P_RAW_RC_FLAGS_FAILSAFE;
+						} else {
+							r_raw_rc_flags &= ~(PX4IO_P_RAW_RC_FLAGS_FAILSAFE);
+						}
 					}
+
+					r_rc_values[mapped] = SIGNED_TO_REG(scaled);
+					assigned_channels |= (1 << mapped);
+
 				}
 			}
+		}
 
-			/* set un-assigned controls to zero */
-			for (unsigned i = 0; i < PX4IO_CONTROL_CHANNELS; i++) {
-				if (!(assigned_channels & (1 << i)))
-					r_rc_values[i] = 0;
+		/* set un-assigned controls to zero */
+		for (unsigned i = 0; i < PX4IO_CONTROL_CHANNELS; i++) {
+			if (!(assigned_channels & (1 << i))) {
+				r_rc_values[i] = 0;
 			}
+		}
 
-			/* set RC OK flag, as we got an update */
-			r_status_flags |= PX4IO_P_STATUS_FLAGS_RC_OK;
+		/* set RC OK flag, as we got an update */
+		r_status_flags |= PX4IO_P_STATUS_FLAGS_RC_OK;
+		r_raw_rc_flags |= PX4IO_P_RAW_RC_FLAGS_RC_OK;
 
-			/* if we have enough channels (5) to control the vehicle, the mapping is ok */
-			if (assigned_channels > 4) {
-				r_raw_rc_flags |= PX4IO_P_RAW_RC_FLAGS_MAPPING_OK;
-			} else {
-				r_raw_rc_flags &= ~(PX4IO_P_RAW_RC_FLAGS_MAPPING_OK);
-			}
+		/* if we have enough channels (5) to control the vehicle, the mapping is ok */
+		if (assigned_channels > 4) {
+			r_raw_rc_flags |= PX4IO_P_RAW_RC_FLAGS_MAPPING_OK;
+		} else {
+			r_raw_rc_flags &= ~(PX4IO_P_RAW_RC_FLAGS_MAPPING_OK);
 		}
 
 		/*
@@ -316,37 +325,42 @@ controls_tick() {
 	 * Handle losing RC input
 	 */
 
-	/* this kicks in if the receiver is gone or the system went to failsafe */
-	if (rc_input_lost || (r_raw_rc_flags & PX4IO_P_RAW_RC_FLAGS_FAILSAFE)) {
+	/* if we are in failsafe, clear the override flag */
+	if (r_raw_rc_flags & PX4IO_P_RAW_RC_FLAGS_FAILSAFE) {
+		r_status_flags &= ~(PX4IO_P_STATUS_FLAGS_OVERRIDE);
+	}
+
+	/* this kicks in if the receiver is gone, but there is not on failsafe (indicated by separate flag) */
+	if (rc_input_lost) {
 		/* Clear the RC input status flag, clear manual override flag */
 		r_status_flags &= ~(
 			PX4IO_P_STATUS_FLAGS_OVERRIDE |
 			PX4IO_P_STATUS_FLAGS_RC_OK);
 
+		/* flag raw RC as lost */
+		r_raw_rc_flags &= ~(PX4IO_P_RAW_RC_FLAGS_RC_OK);
+
 		/* Mark all channels as invalid, as we just lost the RX */
 		r_rc_valid = 0;
 
+		/* Set raw channel count to zero */
+		r_raw_rc_count = 0;
+
 		/* Set the RC_LOST alarm */
 		r_status_alarms |= PX4IO_P_STATUS_ALARMS_RC_LOST;
 	}
 
-	/* this kicks in if the receiver is completely gone */
-	if (rc_input_lost) {
-
-		/* Set channel count to zero */
-		r_raw_rc_count = 0;
-	}
-
 	/*
 	 * Check for manual override.
 	 *
 	 * The PX4IO_P_SETUP_ARMING_MANUAL_OVERRIDE_OK flag must be set, and we
-	 * must have R/C input.
+	 * must have R/C input (NO FAILSAFE!).
 	 * Override is enabled if either the hardcoded channel / value combination
 	 * is selected, or the AP has requested it.
 	 */
 	if ((r_setup_arming & PX4IO_P_SETUP_ARMING_MANUAL_OVERRIDE_OK) && 
-		(r_status_flags & PX4IO_P_STATUS_FLAGS_RC_OK)) {
+		(r_status_flags & PX4IO_P_STATUS_FLAGS_RC_OK) &&
+		!(r_raw_rc_flags & PX4IO_P_RAW_RC_FLAGS_FAILSAFE)) {
 
 		bool override = false;
 
@@ -369,10 +383,10 @@ controls_tick() {
 				mixer_tick();
 
 		} else {
-			r_status_flags &= ~PX4IO_P_STATUS_FLAGS_OVERRIDE;
+			r_status_flags &= ~(PX4IO_P_STATUS_FLAGS_OVERRIDE);
 		}
 	} else {
-		r_status_flags &= ~PX4IO_P_STATUS_FLAGS_OVERRIDE;
+		r_status_flags &= ~(PX4IO_P_STATUS_FLAGS_OVERRIDE);
 	}
 }
 
@@ -395,8 +409,9 @@ ppm_input(uint16_t *values, uint16_t *num_values, uint16_t *frame_len)
 		if (*num_values > PX4IO_RC_INPUT_CHANNELS)
 			*num_values = PX4IO_RC_INPUT_CHANNELS;
 
-		for (unsigned i = 0; i < *num_values; i++)
+		for (unsigned i = 0; i < *num_values; i++) {
 			values[i] = ppm_buffer[i];
+		}
 
 		/* clear validity */
 		ppm_last_valid_decode = 0;
diff --git a/src/modules/px4iofirmware/i2c.c b/src/modules/px4iofirmware/i2c.c
index 79b6546b3..76762c0fc 100644
--- a/src/modules/px4iofirmware/i2c.c
+++ b/src/modules/px4iofirmware/i2c.c
@@ -331,6 +331,7 @@ i2c_tx_complete(void)
 	i2c_tx_setup();
 }
 
+#ifdef DEBUG
 static void
 i2c_dump(void)
 {
@@ -339,3 +340,4 @@ i2c_dump(void)
 	debug("CCR   0x%08x  TRISE 0x%08x", rCCR,  rTRISE);
 	debug("SR1   0x%08x  SR2   0x%08x", rSR1,  rSR2);
 }
+#endif
diff --git a/src/modules/px4iofirmware/mixer.cpp b/src/modules/px4iofirmware/mixer.cpp
index 9558198f3..2f721bf1e 100644
--- a/src/modules/px4iofirmware/mixer.cpp
+++ b/src/modules/px4iofirmware/mixer.cpp
@@ -213,6 +213,7 @@ mixer_tick(void)
 		mixed = mixer_group.mix(&outputs[0], PX4IO_SERVO_COUNT);
 		in_mixer = false;
 
+		/* the pwm limit call takes care of out of band errors */
 		pwm_limit_calc(should_arm, mixed, r_page_servo_disarmed, r_page_servo_control_min, r_page_servo_control_max, outputs, r_page_servos, &pwm_limit);
 
 		for (unsigned i = mixed; i < PX4IO_SERVO_COUNT; i++)
@@ -254,10 +255,25 @@ mixer_tick(void)
 		for (unsigned i = 0; i < PX4IO_SERVO_COUNT; i++)
 			up_pwm_servo_set(i, r_page_servos[i]);
 
+		/* set S.BUS1 or S.BUS2 outputs */
+
+		if (r_setup_features & PX4IO_P_SETUP_FEATURES_SBUS2_OUT) {
+			sbus2_output(r_page_servos, PX4IO_SERVO_COUNT);
+		} else if (r_setup_features & PX4IO_P_SETUP_FEATURES_SBUS1_OUT) {
+			sbus1_output(r_page_servos, PX4IO_SERVO_COUNT);
+		}
+
 	} else if (mixer_servos_armed && should_always_enable_pwm) {
 		/* set the disarmed servo outputs. */
 		for (unsigned i = 0; i < PX4IO_SERVO_COUNT; i++)
 			up_pwm_servo_set(i, r_page_servo_disarmed[i]);
+
+		/* set S.BUS1 or S.BUS2 outputs */
+		if (r_setup_features & PX4IO_P_SETUP_FEATURES_SBUS1_OUT)
+			sbus1_output(r_page_servos, PX4IO_SERVO_COUNT);
+
+		if (r_setup_features & PX4IO_P_SETUP_FEATURES_SBUS2_OUT)
+			sbus2_output(r_page_servos, PX4IO_SERVO_COUNT);
 	}
 }
 
diff --git a/src/modules/px4iofirmware/protocol.h b/src/modules/px4iofirmware/protocol.h
index d48c6c529..d5a6b1ec4 100644
--- a/src/modules/px4iofirmware/protocol.h
+++ b/src/modules/px4iofirmware/protocol.h
@@ -142,6 +142,7 @@
 #define PX4IO_P_RAW_RC_FLAGS_FAILSAFE		(1 << 1) /* receiver is in failsafe mode */
 #define PX4IO_P_RAW_RC_FLAGS_RC_DSM11		(1 << 2) /* DSM decoding is 11 bit mode */
 #define PX4IO_P_RAW_RC_FLAGS_MAPPING_OK		(1 << 3) /* Channel mapping is ok */
+#define PX4IO_P_RAW_RC_FLAGS_RC_OK		(1 << 4) /* RC reception ok */
 
 #define PX4IO_P_RAW_RC_NRSSI			2	/* [2] Normalized RSSI value, 0: no reception, 255: perfect reception */
 #define PX4IO_P_RAW_RC_DATA			3	/* [1] + [2] Details about the RC source (PPM frame length, Spektrum protocol type) */
@@ -164,10 +165,10 @@
 /* setup page */
 #define PX4IO_PAGE_SETUP		50
 #define PX4IO_P_SETUP_FEATURES			0
-#define PX4IO_P_SETUP_FEATURES_SBUS1_OUT	(1 << 0) /* enable S.Bus v1 output */
-#define PX4IO_P_SETUP_FEATURES_SBUS2_OUT	(1 << 1) /* enable S.Bus v2 output */
-#define PX4IO_P_SETUP_FEATURES_PWM_RSSI		(1 << 2) /* enable PWM RSSI parsing */
-#define PX4IO_P_SETUP_FEATURES_ADC_RSSI		(1 << 3) /* enable ADC RSSI parsing */
+#define PX4IO_P_SETUP_FEATURES_SBUS1_OUT	(1 << 0) /**< enable S.Bus v1 output */
+#define PX4IO_P_SETUP_FEATURES_SBUS2_OUT	(1 << 1) /**< enable S.Bus v2 output */
+#define PX4IO_P_SETUP_FEATURES_PWM_RSSI		(1 << 2) /**< enable PWM RSSI parsing */
+#define PX4IO_P_SETUP_FEATURES_ADC_RSSI		(1 << 3) /**< enable ADC RSSI parsing */
 
 #define PX4IO_P_SETUP_ARMING			1	 /* arming controls */
 #define PX4IO_P_SETUP_ARMING_IO_ARM_OK		(1 << 0) /* OK to arm the IO side */
@@ -189,6 +190,8 @@
 #define PX4IO_P_SETUP_RELAYS_POWER2		(1<<1)	/* hardware rev [1] power relay 2 */
 #define PX4IO_P_SETUP_RELAYS_ACC1		(1<<2)	/* hardware rev [1] accessory power 1 */
 #define PX4IO_P_SETUP_RELAYS_ACC2		(1<<3)	/* hardware rev [1] accessory power 2 */
+#else
+#define PX4IO_P_SETUP_RELAYS_PAD		5
 #endif
 
 #define PX4IO_P_SETUP_VBATT_SCALE		6	/* hardware rev [1] battery voltage correction factor (float) */
@@ -201,26 +204,33 @@ enum {							/* DSM bind states */
 	dsm_bind_send_pulses,
 	dsm_bind_reinit_uart
 };
- 					     /*	8 */
-#define PX4IO_P_SETUP_SET_DEBUG			9		/* debug level for IO board */
+						/* 8 */
+#define PX4IO_P_SETUP_SET_DEBUG			9	/* debug level for IO board */
 
-#define PX4IO_P_SETUP_REBOOT_BL		       10	/* reboot IO into bootloader */
-#define PX4IO_REBOOT_BL_MAGIC               14662       /* required argument for reboot (random) */
+#define PX4IO_P_SETUP_REBOOT_BL			10	/* reboot IO into bootloader */
+#define PX4IO_REBOOT_BL_MAGIC			14662	/* required argument for reboot (random) */
 
-#define PX4IO_P_SETUP_CRC		       11	/* get CRC of IO firmware */
+#define PX4IO_P_SETUP_CRC			11	/* get CRC of IO firmware */
+						/* storage space of 12 occupied by CRC */
+#define PX4IO_P_SETUP_FORCE_SAFETY_OFF		12	/* force safety switch into
+                                                           'armed' (PWM enabled) state - this is a non-data write and
+                                                           hence index 12 can safely be used. */
+#define PX4IO_P_SETUP_RC_THR_FAILSAFE_US	13	/**< the throttle failsafe pulse length in microseconds */
+
+#define PX4IO_FORCE_SAFETY_MAGIC		22027	/* required argument for force safety (random) */
 
 /* autopilot control values, -10000..10000 */
-#define PX4IO_PAGE_CONTROLS			51		/**< actuator control groups, one after the other, 8 wide */
+#define PX4IO_PAGE_CONTROLS			51	/**< actuator control groups, one after the other, 8 wide */
 #define PX4IO_P_CONTROLS_GROUP_0		(PX4IO_PROTOCOL_MAX_CONTROL_COUNT * 0)	/**< 0..PX4IO_PROTOCOL_MAX_CONTROL_COUNT - 1 */
 #define PX4IO_P_CONTROLS_GROUP_1		(PX4IO_PROTOCOL_MAX_CONTROL_COUNT * 1)	/**< 0..PX4IO_PROTOCOL_MAX_CONTROL_COUNT - 1 */
 #define PX4IO_P_CONTROLS_GROUP_2		(PX4IO_PROTOCOL_MAX_CONTROL_COUNT * 2)	/**< 0..PX4IO_PROTOCOL_MAX_CONTROL_COUNT - 1 */
 #define PX4IO_P_CONTROLS_GROUP_3		(PX4IO_PROTOCOL_MAX_CONTROL_COUNT * 3)	/**< 0..PX4IO_PROTOCOL_MAX_CONTROL_COUNT - 1 */
 
 #define PX4IO_P_CONTROLS_GROUP_VALID		64
-#define PX4IO_P_CONTROLS_GROUP_VALID_GROUP0	(1 << 0) /* group 0 is valid / received */
-#define PX4IO_P_CONTROLS_GROUP_VALID_GROUP1	(1 << 1) /* group 1 is valid / received */
-#define PX4IO_P_CONTROLS_GROUP_VALID_GROUP2	(1 << 2) /* group 2 is valid / received */
-#define PX4IO_P_CONTROLS_GROUP_VALID_GROUP3	(1 << 3) /* group 3 is valid / received */
+#define PX4IO_P_CONTROLS_GROUP_VALID_GROUP0	(1 << 0) /**< group 0 is valid / received */
+#define PX4IO_P_CONTROLS_GROUP_VALID_GROUP1	(1 << 1) /**< group 1 is valid / received */
+#define PX4IO_P_CONTROLS_GROUP_VALID_GROUP2	(1 << 2) /**< group 2 is valid / received */
+#define PX4IO_P_CONTROLS_GROUP_VALID_GROUP3	(1 << 3) /**< group 3 is valid / received */
 
 /* raw text load to the mixer parser - ignores offset */
 #define PX4IO_PAGE_MIXERLOAD			52
@@ -302,7 +312,7 @@ struct IOPacket {
 
 #define PKT_COUNT(_p)	((_p).count_code & PKT_COUNT_MASK)
 #define PKT_CODE(_p)	((_p).count_code & PKT_CODE_MASK)
-#define PKT_SIZE(_p)	((uint8_t *)&((_p).regs[PKT_COUNT(_p)]) - ((uint8_t *)&(_p)))
+#define PKT_SIZE(_p)	((size_t)((uint8_t *)&((_p).regs[PKT_COUNT(_p)]) - ((uint8_t *)&(_p))))
 
 static const uint8_t crc8_tab[256] __attribute__((unused)) =
 {
diff --git a/src/modules/px4iofirmware/px4io.c b/src/modules/px4iofirmware/px4io.c
index d4c25911e..cd134ccb4 100644
--- a/src/modules/px4iofirmware/px4io.c
+++ b/src/modules/px4iofirmware/px4io.c
@@ -37,6 +37,7 @@
  */
 
 #include <nuttx/config.h>
+#include <nuttx/arch.h>
 
 #include <stdio.h>	// required for task_create
 #include <stdbool.h>
@@ -303,14 +304,12 @@ user_start(int argc, char *argv[])
 		 */
 		if (hrt_absolute_time() - last_debug_time > (1000 * 1000)) {
 
-			struct mallinfo minfo = mallinfo();
-
 			isr_debug(1, "d:%u s=0x%x a=0x%x f=0x%x m=%u", 
 				  (unsigned)r_page_setup[PX4IO_P_SETUP_SET_DEBUG],
 				  (unsigned)r_status_flags,
 				  (unsigned)r_setup_arming,
 				  (unsigned)r_setup_features,
-				  (unsigned)minfo.mxordblk);
+				  (unsigned)mallinfo().mxordblk);
 			last_debug_time = hrt_absolute_time();
 		}
 	}
diff --git a/src/modules/px4iofirmware/px4io.h b/src/modules/px4iofirmware/px4io.h
index 54c5663a5..ca175bfbc 100644
--- a/src/modules/px4iofirmware/px4io.h
+++ b/src/modules/px4iofirmware/px4io.h
@@ -108,6 +108,7 @@ extern uint16_t			r_page_servo_disarmed[];	/* PX4IO_PAGE_DISARMED_PWM */
 #ifdef CONFIG_ARCH_BOARD_PX4IO_V1
 #define r_setup_relays		r_page_setup[PX4IO_P_SETUP_RELAYS]
 #endif
+#define r_setup_rc_thr_failsafe	r_page_setup[PX4IO_P_SETUP_RC_THR_FAILSAFE_US]
 
 #define r_control_values	(&r_page_controls[0])
 
@@ -218,6 +219,8 @@ extern bool	dsm_input(uint16_t *values, uint16_t *num_values);
 extern void	dsm_bind(uint16_t cmd, int pulses);
 extern int	sbus_init(const char *device);
 extern bool	sbus_input(uint16_t *values, uint16_t *num_values, bool *sbus_failsafe, bool *sbus_frame_drop, uint16_t max_channels);
+extern bool	sbus1_output(uint16_t *values, uint16_t num_values);
+extern bool	sbus2_output(uint16_t *values, uint16_t num_values);
 
 /** global debug level for isr_debug() */
 extern volatile uint8_t debug_level;
diff --git a/src/modules/px4iofirmware/registers.c b/src/modules/px4iofirmware/registers.c
index 97d25bbfa..50108ea1b 100644
--- a/src/modules/px4iofirmware/registers.c
+++ b/src/modules/px4iofirmware/registers.c
@@ -119,7 +119,6 @@ uint16_t		r_page_raw_rc_input[] =
 	[PX4IO_P_RAW_RC_DATA]			= 0,
 	[PX4IO_P_RAW_FRAME_COUNT]		= 0,
 	[PX4IO_P_RAW_LOST_FRAME_COUNT]		= 0,
-	[PX4IO_P_RAW_RC_DATA]			= 0,
 	[PX4IO_P_RAW_RC_BASE ... (PX4IO_P_RAW_RC_BASE + PX4IO_RC_INPUT_CHANNELS)] = 0
 };
 
@@ -160,6 +159,9 @@ volatile uint16_t	r_page_setup[] =
 	[PX4IO_P_SETUP_PWM_ALTRATE]		= 200,
 #ifdef CONFIG_ARCH_BOARD_PX4IO_V1
 	[PX4IO_P_SETUP_RELAYS]			= 0,
+#else
+	/* this is unused, but we will pad it for readability (the compiler pads it automatically) */
+	[PX4IO_P_SETUP_RELAYS_PAD]		= 0,
 #endif
 #ifdef ADC_VSERVO
 	[PX4IO_P_SETUP_VSERVO_SCALE]		= 10000,
@@ -169,6 +171,7 @@ volatile uint16_t	r_page_setup[] =
 	[PX4IO_P_SETUP_SET_DEBUG]		= 0,
 	[PX4IO_P_SETUP_REBOOT_BL]		= 0,
 	[PX4IO_P_SETUP_CRC ... (PX4IO_P_SETUP_CRC+1)] = 0,
+	[PX4IO_P_SETUP_RC_THR_FAILSAFE_US] = 0,
 };
 
 #ifdef CONFIG_ARCH_BOARD_PX4IO_V2
@@ -462,9 +465,18 @@ registers_set_one(uint8_t page, uint8_t offset, uint16_t value)
 			#ifdef ENABLE_SBUS_OUT
 			ENABLE_SBUS_OUT(value & (PX4IO_P_SETUP_FEATURES_SBUS1_OUT | PX4IO_P_SETUP_FEATURES_SBUS2_OUT));
 
-			/* disable the conflicting options */
-			if (value & (PX4IO_P_SETUP_FEATURES_SBUS1_OUT | PX4IO_P_SETUP_FEATURES_SBUS2_OUT)) {
-				value &= ~(PX4IO_P_SETUP_FEATURES_PWM_RSSI | PX4IO_P_SETUP_FEATURES_ADC_RSSI);
+			/* disable the conflicting options with SBUS 1 */
+			if (value & (PX4IO_P_SETUP_FEATURES_SBUS1_OUT)) {
+				value &= ~(PX4IO_P_SETUP_FEATURES_PWM_RSSI |
+					PX4IO_P_SETUP_FEATURES_ADC_RSSI |
+					PX4IO_P_SETUP_FEATURES_SBUS2_OUT);
+			}
+
+			/* disable the conflicting options with SBUS 2 */
+			if (value & (PX4IO_P_SETUP_FEATURES_SBUS2_OUT)) {
+				value &= ~(PX4IO_P_SETUP_FEATURES_PWM_RSSI |
+					PX4IO_P_SETUP_FEATURES_ADC_RSSI |
+					PX4IO_P_SETUP_FEATURES_SBUS1_OUT);
 			}
 			#endif
 
@@ -513,18 +525,22 @@ registers_set_one(uint8_t page, uint8_t offset, uint16_t value)
 			break;
 
 		case PX4IO_P_SETUP_PWM_DEFAULTRATE:
-			if (value < 50)
+			if (value < 50) {
 				value = 50;
-			if (value > 400)
+			}
+			if (value > 400) {
 				value = 400;
+			}
 			pwm_configure_rates(r_setup_pwm_rates, value, r_setup_pwm_altrate);
 			break;
 
 		case PX4IO_P_SETUP_PWM_ALTRATE:
-			if (value < 50)
+			if (value < 50) {
 				value = 50;
-			if (value > 400)
+			}
+			if (value > 400) {
 				value = 400;
+			}
 			pwm_configure_rates(r_setup_pwm_rates, r_setup_pwm_defaultrate, value);
 			break;
 
@@ -556,8 +572,9 @@ registers_set_one(uint8_t page, uint8_t offset, uint16_t value)
 			}
 
 			// check the magic value
-			if (value != PX4IO_REBOOT_BL_MAGIC)
+			if (value != PX4IO_REBOOT_BL_MAGIC) {
 				break;
+			}
 
                         // we schedule a reboot rather than rebooting
                         // immediately to allow the IO board to ACK
@@ -569,6 +586,18 @@ registers_set_one(uint8_t page, uint8_t offset, uint16_t value)
 			dsm_bind(value & 0x0f, (value >> 4) & 0xF);
 			break;
 
+		case PX4IO_P_SETUP_FORCE_SAFETY_OFF:
+			if (value == PX4IO_FORCE_SAFETY_MAGIC) {
+				r_status_flags |= PX4IO_P_STATUS_FLAGS_SAFETY_OFF;
+			}
+			break;
+
+		case PX4IO_P_SETUP_RC_THR_FAILSAFE_US:
+			if (value > 650 && value < 2350) {
+				r_page_setup[PX4IO_P_SETUP_RC_THR_FAILSAFE_US] = value;
+			}
+			break;
+
 		default:
 			return -1;
 		}
@@ -640,7 +669,7 @@ registers_set_one(uint8_t page, uint8_t offset, uint16_t value)
 
 				if (conf[PX4IO_P_RC_CONFIG_ASSIGNMENT] == UINT8_MAX) {
 					disabled = true;
-				} else if ((int)(conf[PX4IO_P_RC_CONFIG_ASSIGNMENT]) < 0 || conf[PX4IO_P_RC_CONFIG_ASSIGNMENT] >= PX4IO_RC_MAPPED_CONTROL_CHANNELS) {
+				} else if (conf[PX4IO_P_RC_CONFIG_ASSIGNMENT] >= PX4IO_RC_MAPPED_CONTROL_CHANNELS) {
 					count++;
 				}
 
diff --git a/src/modules/px4iofirmware/sbus.c b/src/modules/px4iofirmware/sbus.c
index f6ec542eb..70ccab180 100644
--- a/src/modules/px4iofirmware/sbus.c
+++ b/src/modules/px4iofirmware/sbus.c
@@ -93,7 +93,7 @@ int
 sbus_init(const char *device)
 {
 	if (sbus_fd < 0)
-		sbus_fd = open(device, O_RDONLY | O_NONBLOCK);
+		sbus_fd = open(device, O_RDWR | O_NONBLOCK);
 
 	if (sbus_fd >= 0) {
 		struct termios t;
@@ -113,11 +113,24 @@ sbus_init(const char *device)
 	} else {
 		debug("S.Bus: open failed");
 	}
-
 	return sbus_fd;
 }
 
 bool
+sbus1_output(uint16_t *values, uint16_t num_values)
+{
+	char a = 'A';
+	write(sbus_fd, &a, 1);
+}
+
+bool
+sbus2_output(uint16_t *values, uint16_t num_values)
+{
+	char b = 'B';
+	write(sbus_fd, &b, 1);
+}
+
+bool
 sbus_input(uint16_t *values, uint16_t *num_values, bool *sbus_failsafe, bool *sbus_frame_drop, uint16_t max_channels)
 {
 	ssize_t		ret;
diff --git a/src/modules/sdlog/module.mk b/src/modules/sdlog/module.mk
deleted file mode 100644
index 89da2d827..000000000
--- a/src/modules/sdlog/module.mk
+++ /dev/null
@@ -1,43 +0,0 @@
-############################################################################
-#
-#   Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions
-# are met:
-#
-# 1. Redistributions of source code must retain the above copyright
-#    notice, this list of conditions and the following disclaimer.
-# 2. Redistributions in binary form must reproduce the above copyright
-#    notice, this list of conditions and the following disclaimer in
-#    the documentation and/or other materials provided with the
-#    distribution.
-# 3. Neither the name PX4 nor the names of its contributors may be
-#    used to endorse or promote products derived from this software
-#    without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
-# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
-# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-# POSSIBILITY OF SUCH DAMAGE.
-#
-############################################################################
-
-#
-# sdlog Application
-#
-
-MODULE_COMMAND	 = sdlog
-# The main thread only buffers to RAM, needs a high priority
-MODULE_PRIORITY	 = "SCHED_PRIORITY_MAX-30"
-
-SRCS		 = sdlog.c \
-		   sdlog_ringbuffer.c
diff --git a/src/modules/sdlog/sdlog.c b/src/modules/sdlog/sdlog.c
deleted file mode 100644
index c22523bf2..000000000
--- a/src/modules/sdlog/sdlog.c
+++ /dev/null
@@ -1,840 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: Lorenz Meier <lm@inf.ethz.ch>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/**
- * @file sdlog.c
- * @author Lorenz Meier <lm@inf.ethz.ch>
- *
- * Simple SD logger for flight data. Buffers new sensor values and
- * does the heavy SD I/O in a low-priority worker thread.
- */
-
-#include <nuttx/config.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/prctl.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <poll.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
-#include <systemlib/err.h>
-#include <unistd.h>
-#include <drivers/drv_hrt.h>
-
-#include <uORB/uORB.h>
-#include <uORB/topics/sensor_combined.h>
-#include <uORB/topics/vehicle_attitude.h>
-#include <uORB/topics/vehicle_attitude_setpoint.h>
-#include <uORB/topics/actuator_outputs.h>
-#include <uORB/topics/actuator_controls.h>
-#include <uORB/topics/actuator_controls_effective.h>
-#include <uORB/topics/vehicle_command.h>
-#include <uORB/topics/vehicle_local_position.h>
-#include <uORB/topics/vehicle_global_position.h>
-#include <uORB/topics/vehicle_gps_position.h>
-#include <uORB/topics/vehicle_vicon_position.h>
-#include <uORB/topics/optical_flow.h>
-#include <uORB/topics/battery_status.h>
-#include <uORB/topics/differential_pressure.h>
-#include <uORB/topics/airspeed.h>
-
-#include <systemlib/systemlib.h>
-
-#include <mavlink/mavlink_log.h>
-
-#include "sdlog_ringbuffer.h"
-
-static bool thread_should_exit = false;		/**< Deamon exit flag */
-static bool thread_running = false;		/**< Deamon status flag */
-static int deamon_task;				/**< Handle of deamon task / thread */
-static const int MAX_NO_LOGFOLDER = 999;	/**< Maximum number of log folders */
-
-static const char *mountpoint = "/fs/microsd";
-static const char *mfile_in = "/etc/logging/logconv.m";
-int sysvector_file = -1;
-int mavlink_fd = -1;
-struct sdlog_logbuffer lb;
-
-/* mutex / condition to synchronize threads */
-pthread_mutex_t sysvector_mutex;
-pthread_cond_t sysvector_cond;
-
-/**
- * System state vector log buffer writing
- */
-static void *sdlog_sysvector_write_thread(void *arg);
-
-/**
- * Create the thread to write the system vector
- */
-pthread_t sysvector_write_start(struct sdlog_logbuffer *logbuf);
-
-/**
- * SD log management function.
- */
-__EXPORT int sdlog_main(int argc, char *argv[]);
-
-/**
- * Mainloop of sd log deamon.
- */
-int sdlog_thread_main(int argc, char *argv[]);
-
-/**
- * Print the correct usage.
- */
-static void usage(const char *reason);
-
-static int file_exist(const char *filename);
-
-static int file_copy(const char *file_old, const char *file_new);
-
-static void handle_command(struct vehicle_command_s *cmd);
-
-/**
- * Print the current status.
- */
-static void print_sdlog_status(void);
-
-/**
- * Create folder for current logging session.
- */
-static int create_logfolder(char *folder_path);
-
-static void
-usage(const char *reason)
-{
-	if (reason)
-		fprintf(stderr, "%s\n", reason);
-
-	errx(1, "usage: sdlog {start|stop|status} [-s <number of skipped lines>]\n\n");
-}
-
-// XXX turn this into a C++ class
-unsigned sensor_combined_bytes = 0;
-unsigned actuator_outputs_bytes = 0;
-unsigned actuator_controls_bytes = 0;
-unsigned sysvector_bytes = 0;
-unsigned blackbox_file_bytes = 0;
-uint64_t starttime = 0;
-
-/* logging on or off, default to true */
-bool logging_enabled = true;
-
-/**
- * The sd log deamon app only briefly exists to start
- * the background job. The stack size assigned in the
- * Makefile does only apply to this management task.
- *
- * The actual stack size should be set in the call
- * to task_spawn_cmd().
- */
-int sdlog_main(int argc, char *argv[])
-{
-	if (argc < 1)
-		usage("missing command");
-
-	if (!strcmp(argv[1], "start")) {
-
-		if (thread_running) {
-			printf("sdlog already running\n");
-			/* this is not an error */
-			exit(0);
-		}
-
-		thread_should_exit = false;
-		deamon_task = task_spawn_cmd("sdlog",
-					 SCHED_DEFAULT,
-					 SCHED_PRIORITY_DEFAULT - 30,
-					 4096,
-					 sdlog_thread_main,
-					 (const char **)argv);
-		exit(0);
-	}
-
-	if (!strcmp(argv[1], "stop")) {
-		if (!thread_running) {
-			printf("\tsdlog is not started\n");
-		}
-
-		thread_should_exit = true;
-		exit(0);
-	}
-
-	if (!strcmp(argv[1], "status")) {
-		if (thread_running) {
-			print_sdlog_status();
-
-		} else {
-			printf("\tsdlog not started\n");
-		}
-
-		exit(0);
-	}
-
-	usage("unrecognized command");
-	exit(1);
-}
-
-int create_logfolder(char *folder_path)
-{
-	/* make folder on sdcard */
-	uint16_t foldernumber = 1; // start with folder 0001
-	int mkdir_ret;
-
-	/* look for the next folder that does not exist */
-	while (foldernumber < MAX_NO_LOGFOLDER) {
-		/* set up file path: e.g. /mnt/sdcard/sensorfile0001.txt */
-		sprintf(folder_path, "%s/session%04u", mountpoint, foldernumber);
-		mkdir_ret = mkdir(folder_path, S_IRWXU | S_IRWXG | S_IRWXO);
-		/* the result is -1 if the folder exists */
-
-		if (mkdir_ret == 0) {
-			/* folder does not exist, success */
-
-			/* now copy the Matlab/Octave file */
-			char mfile_out[100];
-			sprintf(mfile_out, "%s/session%04u/run_to_plot_data.m", mountpoint, foldernumber);
-			int ret = file_copy(mfile_in, mfile_out);
-
-			if (!ret) {
-				warnx("copied m file to %s", mfile_out);
-
-			} else {
-				warnx("failed copying m file from %s to\n %s", mfile_in, mfile_out);
-			}
-
-			break;
-
-		} else if (mkdir_ret == -1) {
-			/* folder exists already */
-			foldernumber++;
-			continue;
-
-		} else {
-			warn("failed creating new folder");
-			return -1;
-		}
-	}
-
-	if (foldernumber >= MAX_NO_LOGFOLDER) {
-		/* we should not end up here, either we have more than MAX_NO_LOGFOLDER on the SD card, or another problem */
-		warn("all %d possible folders exist already", MAX_NO_LOGFOLDER);
-		return -1;
-	}
-
-	return 0;
-}
-
-
-static void *
-sdlog_sysvector_write_thread(void *arg)
-{
-	/* set name */
-	prctl(PR_SET_NAME, "sdlog microSD I/O", 0);
-
-	struct sdlog_logbuffer *logbuf = (struct sdlog_logbuffer *)arg;
-
-	int poll_count = 0;
-	struct sdlog_sysvector sysvect;
-	memset(&sysvect, 0, sizeof(sysvect));
-
-	while (!thread_should_exit) {
-		
-		/* make sure threads are synchronized */
-		pthread_mutex_lock(&sysvector_mutex);
-
-		/* only wait if no data is available to process */
-		if (sdlog_logbuffer_is_empty(logbuf)) {
-			/* blocking wait for new data at this line */
-			pthread_cond_wait(&sysvector_cond, &sysvector_mutex);
-		}
-
-		/* only quickly load data, do heavy I/O a few lines down */
-		int ret = sdlog_logbuffer_read(logbuf, &sysvect);
-		/* continue */
-		pthread_mutex_unlock(&sysvector_mutex);
-
-		if (ret == OK) {
-			sysvector_bytes += write(sysvector_file, (const char *)&sysvect, sizeof(sysvect));
-		}
-
-		if (poll_count % 100 == 0) {
-			fsync(sysvector_file);
-		}
-
-		poll_count++;
-	}
-
-	fsync(sysvector_file);
-
-	return OK;
-}
-
-pthread_t
-sysvector_write_start(struct sdlog_logbuffer *logbuf)
-{
-	pthread_attr_t receiveloop_attr;
-	pthread_attr_init(&receiveloop_attr);
-
-	struct sched_param param;
-	/* low priority, as this is expensive disk I/O */
-	param.sched_priority = SCHED_PRIORITY_DEFAULT - 40;
-	(void)pthread_attr_setschedparam(&receiveloop_attr, &param);
-
-	pthread_attr_setstacksize(&receiveloop_attr, 2048);
-
-	pthread_t thread;
-	pthread_create(&thread, &receiveloop_attr, sdlog_sysvector_write_thread, logbuf);
-	return thread;
-
-	// XXX we have to destroy the attr at some point
-}
-
-
-int sdlog_thread_main(int argc, char *argv[])
-{
-	mavlink_fd = open(MAVLINK_LOG_DEVICE, 0);
-
-	if (mavlink_fd < 0) {
-		warnx("ERROR: Failed to open MAVLink log stream, start mavlink app first.\n");
-	}
-
-	/* log every n'th value (skip three per default) */
-	int skip_value = 3;
-
-	/* work around some stupidity in task_create's argv handling */
-	argc -= 2;
-	argv += 2;
-	int ch;
-
-	while ((ch = getopt(argc, argv, "s:r")) != EOF) {
-		switch (ch) {
-		case 's':
-			{
-			/* log only every n'th (gyro clocked) value */
-			unsigned s = strtoul(optarg, NULL, 10);
-
-			if (s < 1 || s > 250) {
-				errx(1, "Wrong skip value of %d, out of range (1..250)\n", s);
-			} else {
-				skip_value = s;
-			}
-			}
-			break;
-
-		case 'r':
-			/* log only on request, disable logging per default */
-			logging_enabled = false;
-			break;
-
-		case '?':
-			if (optopt == 'c') {
-				warnx("Option -%c requires an argument.\n", optopt);
-			} else if (isprint(optopt)) {
-				warnx("Unknown option `-%c'.\n", optopt);
-			} else {
-				warnx("Unknown option character `\\x%x'.\n", optopt);
-			}
-
-		default:
-			usage("unrecognized flag");
-			errx(1, "exiting.");
-		}
-	}
-
-	if (file_exist(mountpoint) != OK) {
-		errx(1, "logging mount point %s not present, exiting.", mountpoint);
-	}
-
-	char folder_path[64];
-
-	if (create_logfolder(folder_path))
-		errx(1, "unable to create logging folder, exiting.");
-
-	FILE *gpsfile;
-	FILE *blackbox_file;
-
-	/* string to hold the path to the sensorfile */
-	char path_buf[64] = "";
-
-	/* only print logging path, important to find log file later */
-	warnx("logging to directory %s\n", folder_path);
-
-	/* set up file path: e.g. /mnt/sdcard/session0001/actuator_controls0.bin */
-	sprintf(path_buf, "%s/%s.bin", folder_path, "sysvector");
-
-	if (0 == (sysvector_file = open(path_buf, O_CREAT | O_WRONLY | O_DSYNC))) {
-		errx(1, "opening %s failed.\n", path_buf);
-	}
-
-	/* set up file path: e.g. /mnt/sdcard/session0001/gps.txt */
-	sprintf(path_buf, "%s/%s.txt", folder_path, "gps");
-
-	if (NULL == (gpsfile = fopen(path_buf, "w"))) {
-		errx(1, "opening %s failed.\n", path_buf);
-	}
-
-	int gpsfile_no = fileno(gpsfile);
-
-	/* set up file path: e.g. /mnt/sdcard/session0001/blackbox.txt */
-	sprintf(path_buf, "%s/%s.txt", folder_path, "blackbox");
-
-	if (NULL == (blackbox_file = fopen(path_buf, "w"))) {
-		errx(1, "opening %s failed.\n", path_buf);
-	}
-
-	// XXX for fsync() calls
-	int blackbox_file_no = fileno(blackbox_file);
-
-	/* --- IMPORTANT: DEFINE NUMBER OF ORB STRUCTS TO WAIT FOR HERE --- */
-	/* number of messages */
-	const ssize_t fdsc = 25;
-	/* Sanity check variable and index */
-	ssize_t fdsc_count = 0;
-	/* file descriptors to wait for */
-	struct pollfd fds[fdsc];
-
-
-	struct {
-		struct sensor_combined_s raw;
-		struct vehicle_attitude_s att;
-		struct vehicle_attitude_setpoint_s att_sp;
-		struct actuator_outputs_s act_outputs;
-		struct actuator_controls_s act_controls;
-		struct actuator_controls_effective_s act_controls_effective;
-		struct vehicle_command_s cmd;
-		struct vehicle_local_position_s local_pos;
-		struct vehicle_global_position_s global_pos;
-		struct vehicle_gps_position_s gps_pos;
-		struct vehicle_vicon_position_s vicon_pos;
-		struct optical_flow_s flow;
-		struct battery_status_s batt;
-		struct differential_pressure_s diff_pres;
-		struct airspeed_s airspeed;
-	} buf;
-	memset(&buf, 0, sizeof(buf));
-
-	struct {
-		int cmd_sub;
-		int sensor_sub;
-		int att_sub;
-		int spa_sub;
-		int act_0_sub;
-		int controls_0_sub;
-		int controls_effective_0_sub;
-		int local_pos_sub;
-		int global_pos_sub;
-		int gps_pos_sub;
-		int vicon_pos_sub;
-		int flow_sub;
-		int batt_sub;
-		int diff_pres_sub;
-		int airspeed_sub;
-	} subs;
-
-	/* --- MANAGEMENT - LOGGING COMMAND --- */
-	/* subscribe to ORB for vehicle command */
-	subs.cmd_sub = orb_subscribe(ORB_ID(vehicle_command));
-	fds[fdsc_count].fd = subs.cmd_sub;
-	fds[fdsc_count].events = POLLIN;
-	fdsc_count++;
-
-	/* --- GPS POSITION --- */
-	/* subscribe to ORB for global position */
-	subs.gps_pos_sub = orb_subscribe(ORB_ID(vehicle_gps_position));
-	fds[fdsc_count].fd = subs.gps_pos_sub;
-	fds[fdsc_count].events = POLLIN;
-	fdsc_count++;
-
-	/* --- SENSORS RAW VALUE --- */
-	/* subscribe to ORB for sensors raw */
-	subs.sensor_sub = orb_subscribe(ORB_ID(sensor_combined));
-	fds[fdsc_count].fd = subs.sensor_sub;
-	/* do not rate limit, instead use skip counter (aliasing on rate limit) */
-	fds[fdsc_count].events = POLLIN;
-	fdsc_count++;
-
-	/* --- ATTITUDE VALUE --- */
-	/* subscribe to ORB for attitude */
-	subs.att_sub = orb_subscribe(ORB_ID(vehicle_attitude));
-	fds[fdsc_count].fd = subs.att_sub;
-	fds[fdsc_count].events = POLLIN;
-	fdsc_count++;
-
-	/* --- ATTITUDE SETPOINT VALUE --- */
-	/* subscribe to ORB for attitude setpoint */
-	/* struct already allocated */
-	subs.spa_sub = orb_subscribe(ORB_ID(vehicle_attitude_setpoint));
-	fds[fdsc_count].fd = subs.spa_sub;
-	fds[fdsc_count].events = POLLIN;
-	fdsc_count++;
-
-	/** --- ACTUATOR OUTPUTS --- */
-	subs.act_0_sub = orb_subscribe(ORB_ID(actuator_outputs_0));
-	fds[fdsc_count].fd = subs.act_0_sub;
-	fds[fdsc_count].events = POLLIN;
-	fdsc_count++;
-
-	/* --- ACTUATOR CONTROL VALUE --- */
-	/* subscribe to ORB for actuator control */
-	subs.controls_0_sub = orb_subscribe(ORB_ID_VEHICLE_ATTITUDE_CONTROLS);
-	fds[fdsc_count].fd = subs.controls_0_sub;
-	fds[fdsc_count].events = POLLIN;
-	fdsc_count++;
-
-	/* --- ACTUATOR CONTROL EFFECTIVE VALUE --- */
-	/* subscribe to ORB for actuator control */
-	subs.controls_effective_0_sub = orb_subscribe(ORB_ID_VEHICLE_ATTITUDE_CONTROLS_EFFECTIVE);
-	fds[fdsc_count].fd = subs.controls_effective_0_sub;
-	fds[fdsc_count].events = POLLIN;
-	fdsc_count++;
-
-	/* --- LOCAL POSITION --- */
-	/* subscribe to ORB for local position */
-	subs.local_pos_sub = orb_subscribe(ORB_ID(vehicle_local_position));
-	fds[fdsc_count].fd = subs.local_pos_sub;
-	fds[fdsc_count].events = POLLIN;
-	fdsc_count++;
-
-	/* --- GLOBAL POSITION --- */
-	/* subscribe to ORB for global position */
-	subs.global_pos_sub = orb_subscribe(ORB_ID(vehicle_global_position));
-	fds[fdsc_count].fd = subs.global_pos_sub;
-	fds[fdsc_count].events = POLLIN;
-	fdsc_count++;
-
-	/* --- VICON POSITION --- */
-	/* subscribe to ORB for vicon position */
-	subs.vicon_pos_sub = orb_subscribe(ORB_ID(vehicle_vicon_position));
-	fds[fdsc_count].fd = subs.vicon_pos_sub;
-	fds[fdsc_count].events = POLLIN;
-	fdsc_count++;
-
-	/* --- FLOW measurements --- */
-	/* subscribe to ORB for flow measurements */
-	subs.flow_sub = orb_subscribe(ORB_ID(optical_flow));
-	fds[fdsc_count].fd = subs.flow_sub;
-	fds[fdsc_count].events = POLLIN;
-	fdsc_count++;
-
-	/* --- BATTERY STATUS --- */
-	/* subscribe to ORB for flow measurements */
-	subs.batt_sub = orb_subscribe(ORB_ID(battery_status));
-	fds[fdsc_count].fd = subs.batt_sub;
-	fds[fdsc_count].events = POLLIN;
-	fdsc_count++;
-
-	/* --- DIFFERENTIAL PRESSURE --- */
-	/* subscribe to ORB for flow measurements */
-	subs.diff_pres_sub = orb_subscribe(ORB_ID(differential_pressure));
-	fds[fdsc_count].fd = subs.diff_pres_sub;
-	fds[fdsc_count].events = POLLIN;
-	fdsc_count++;
-
-	/* --- AIRSPEED --- */
-	/* subscribe to ORB for airspeed */
-	subs.airspeed_sub = orb_subscribe(ORB_ID(airspeed));
-	fds[fdsc_count].fd = subs.airspeed_sub;
-	fds[fdsc_count].events = POLLIN;
-	fdsc_count++;	
-
-	/* WARNING: If you get the error message below,
-	 * then the number of registered messages (fdsc)
-	 * differs from the number of messages in the above list.
-	 */
-	if (fdsc_count > fdsc) {
-		warn("WARNING: Not enough space for poll fds allocated. Check %s:%d.\n", __FILE__, __LINE__);
-		fdsc_count = fdsc;
-	}
-
-	/*
-	 * set up poll to block for new data,
-	 * wait for a maximum of 1000 ms (1 second)
-	 */
-	// const int timeout = 1000;
-
-	thread_running = true;
-
-	/* initialize log buffer with a size of 10 */
-	sdlog_logbuffer_init(&lb, 10);
-
-	/* initialize thread synchronization */
-	pthread_mutex_init(&sysvector_mutex, NULL);
-  	pthread_cond_init(&sysvector_cond, NULL);
-
-	/* start logbuffer emptying thread */
-	pthread_t sysvector_pthread = sysvector_write_start(&lb);
-
-	starttime = hrt_absolute_time();
-
-	/* track skipping */
-	int skip_count = 0;
-
-	while (!thread_should_exit) {
-
-		/* only poll for commands, gps and sensor_combined */
-		int poll_ret = poll(fds, 3, 1000);
-
-		/* handle the poll result */
-		if (poll_ret == 0) {
-			/* XXX this means none of our providers is giving us data - might be an error? */
-		} else if (poll_ret < 0) {
-			/* XXX this is seriously bad - should be an emergency */
-		} else {
-
-			int ifds = 0;
-
-			/* --- VEHICLE COMMAND VALUE --- */
-			if (fds[ifds++].revents & POLLIN) {
-				/* copy command into local buffer */
-				orb_copy(ORB_ID(vehicle_command), subs.cmd_sub, &buf.cmd);
-
-				/* always log to blackbox, even when logging disabled */
-				blackbox_file_bytes += fprintf(blackbox_file, "[%10.4f\tVCMD] CMD #%d [%f\t%f\t%f\t%f\t%f\t%f\t%f]\n", hrt_absolute_time()/1000000.0d,
-					buf.cmd.command, (double)buf.cmd.param1, (double)buf.cmd.param2, (double)buf.cmd.param3, (double)buf.cmd.param4,
-					(double)buf.cmd.param5, (double)buf.cmd.param6, (double)buf.cmd.param7);
-
-				handle_command(&buf.cmd);
-			}
-
-			/* --- VEHICLE GPS VALUE --- */
-			if (fds[ifds++].revents & POLLIN) {
-				/* copy gps position into local buffer */
-				orb_copy(ORB_ID(vehicle_gps_position), subs.gps_pos_sub, &buf.gps_pos);
-
-				/* if logging disabled, continue */
-				if (logging_enabled) {
-
-				/* write KML line */
-				}
-			}
-
-			/* --- SENSORS RAW VALUE --- */
-			if (fds[ifds++].revents & POLLIN) {
-
-				// /* copy sensors raw data into local buffer */
-				// orb_copy(ORB_ID(sensor_combined), subs.sensor_sub, &buf.raw);
-				// /* write out */
-				// sensor_combined_bytes += write(sensorfile, (const char*)&(buf.raw), sizeof(buf.raw));
-
-				/* always copy sensors raw data into local buffer, since poll flags won't clear else */
-				orb_copy(ORB_ID(sensor_combined), subs.sensor_sub, &buf.raw);
-				orb_copy(ORB_ID_VEHICLE_ATTITUDE_CONTROLS, subs.controls_0_sub, &buf.act_controls);
-				orb_copy(ORB_ID_VEHICLE_ATTITUDE_CONTROLS_EFFECTIVE, subs.controls_effective_0_sub, &buf.act_controls_effective);
-				orb_copy(ORB_ID(actuator_outputs_0), subs.act_0_sub, &buf.act_outputs);
-				orb_copy(ORB_ID(vehicle_attitude_setpoint), subs.spa_sub, &buf.att_sp);
-				orb_copy(ORB_ID(vehicle_gps_position), subs.gps_pos_sub, &buf.gps_pos);
-				orb_copy(ORB_ID(vehicle_local_position), subs.local_pos_sub, &buf.local_pos);
-				orb_copy(ORB_ID(vehicle_global_position), subs.global_pos_sub, &buf.global_pos);
-				orb_copy(ORB_ID(vehicle_attitude), subs.att_sub, &buf.att);
-				orb_copy(ORB_ID(vehicle_vicon_position), subs.vicon_pos_sub, &buf.vicon_pos);
-				orb_copy(ORB_ID(optical_flow), subs.flow_sub, &buf.flow);
-				orb_copy(ORB_ID(differential_pressure), subs.diff_pres_sub, &buf.diff_pres);
-				orb_copy(ORB_ID(airspeed), subs.airspeed_sub, &buf.airspeed);
-				orb_copy(ORB_ID(battery_status), subs.batt_sub, &buf.batt);
-
-				/* if skipping is on or logging is disabled, ignore */
-				if (skip_count < skip_value || !logging_enabled) {
-					skip_count++;
-					/* do not log data */
-					continue;
-				} else {
-					/* log data, reset */
-					skip_count = 0;
-				}
-
-				struct sdlog_sysvector sysvect = {
-					.timestamp = buf.raw.timestamp,
-					.gyro = {buf.raw.gyro_rad_s[0], buf.raw.gyro_rad_s[1], buf.raw.gyro_rad_s[2]},
-					.accel = {buf.raw.accelerometer_m_s2[0], buf.raw.accelerometer_m_s2[1], buf.raw.accelerometer_m_s2[2]},
-					.mag = {buf.raw.magnetometer_ga[0], buf.raw.magnetometer_ga[1], buf.raw.magnetometer_ga[2]},
-					.baro = buf.raw.baro_pres_mbar,
-					.baro_alt = buf.raw.baro_alt_meter,
-					.baro_temp = buf.raw.baro_temp_celcius,
-					.control = {buf.act_controls.control[0], buf.act_controls.control[1], buf.act_controls.control[2], buf.act_controls.control[3]},
-					.actuators = {
-						buf.act_outputs.output[0], buf.act_outputs.output[1], buf.act_outputs.output[2], buf.act_outputs.output[3],
-						buf.act_outputs.output[4], buf.act_outputs.output[5], buf.act_outputs.output[6], buf.act_outputs.output[7]
-					},
-					.vbat = buf.batt.voltage_v,
-					.bat_current = buf.batt.current_a,
-					.bat_discharged = buf.batt.discharged_mah,
-					.adc = {buf.raw.adc_voltage_v[0], buf.raw.adc_voltage_v[1], buf.raw.adc_voltage_v[2], buf.raw.adc_voltage_v[3]},
-					.local_position = {buf.local_pos.x, buf.local_pos.y, buf.local_pos.z},
-					.gps_raw_position = {buf.gps_pos.lat, buf.gps_pos.lon, buf.gps_pos.alt},
-					.attitude = {buf.att.pitch, buf.att.roll, buf.att.yaw},
-					.rotMatrix = {buf.att.R[0][0], buf.att.R[0][1], buf.att.R[0][2], buf.att.R[1][0], buf.att.R[1][1], buf.att.R[1][2], buf.att.R[2][0], buf.att.R[2][1], buf.att.R[2][2]},
-					.vicon = {buf.vicon_pos.x, buf.vicon_pos.y, buf.vicon_pos.z, buf.vicon_pos.roll, buf.vicon_pos.pitch, buf.vicon_pos.yaw},
-					.control_effective = {buf.act_controls_effective.control_effective[0], buf.act_controls_effective.control_effective[1], buf.act_controls_effective.control_effective[2], buf.act_controls_effective.control_effective[3]},
-					.flow = {buf.flow.flow_raw_x, buf.flow.flow_raw_y, buf.flow.flow_comp_x_m, buf.flow.flow_comp_y_m, buf.flow.ground_distance_m, buf.flow.quality},
-					.diff_pressure = buf.diff_pres.differential_pressure_pa,
-					.ind_airspeed = buf.airspeed.indicated_airspeed_m_s,
-					.true_airspeed = buf.airspeed.true_airspeed_m_s
-				};
-
-				/* put into buffer for later IO */
-				pthread_mutex_lock(&sysvector_mutex);
-				sdlog_logbuffer_write(&lb, &sysvect);
-				/* signal the other thread new data, but not yet unlock */
-				if ((unsigned)lb.count > (lb.size / 2)) {
-					/* only request write if several packets can be written at once */
-					pthread_cond_signal(&sysvector_cond);
-				}
-				/* unlock, now the writer thread may run */
-				pthread_mutex_unlock(&sysvector_mutex);
-			}
-
-		}
-
-	}
-
-	print_sdlog_status();
-
-	/* wake up write thread one last time */
-	pthread_mutex_lock(&sysvector_mutex);
-	pthread_cond_signal(&sysvector_cond);
-	/* unlock, now the writer thread may return */
-	pthread_mutex_unlock(&sysvector_mutex);
-
-	/* wait for write thread to return */
-	(void)pthread_join(sysvector_pthread, NULL);
-
-  	pthread_mutex_destroy(&sysvector_mutex);
-  	pthread_cond_destroy(&sysvector_cond);
-
-	warnx("exiting.\n\n");
-
-	/* finish KML file */
-	// XXX
-	fclose(gpsfile);
-	fclose(blackbox_file);
-
-	thread_running = false;
-
-	return 0;
-}
-
-void print_sdlog_status()
-{
-	unsigned bytes = sysvector_bytes + sensor_combined_bytes + actuator_outputs_bytes + blackbox_file_bytes + actuator_controls_bytes;
-	float mebibytes = bytes / 1024.0f / 1024.0f;
-	float seconds = ((float)(hrt_absolute_time() - starttime)) / 1000000.0f;
-
-	warnx("wrote %4.2f MiB (average %5.3f MiB/s).\n", (double)mebibytes, (double)(mebibytes / seconds));
-}
-
-/**
- * @return 0 if file exists
- */
-int file_exist(const char *filename)
-{
-	struct stat buffer;
-	return stat(filename, &buffer);
-}
-
-int file_copy(const char *file_old, const char *file_new)
-{
-	FILE *source, *target;
-	source = fopen(file_old, "r");
-	int ret = 0;
-
-	if (source == NULL) {
-		warnx("failed opening input file to copy");
-		return 1;
-	}
-
-	target = fopen(file_new, "w");
-
-	if (target == NULL) {
-		fclose(source);
-		warnx("failed to open output file to copy");
-		return 1;
-	}
-
-	char buf[128];
-	int nread;
-
-	while ((nread = fread(buf, 1, sizeof(buf), source)) > 0) {
-		int ret = fwrite(buf, 1, nread, target);
-
-		if (ret <= 0) {
-			warnx("error writing file");
-			ret = 1;
-			break;
-		}
-	}
-
-	fsync(fileno(target));
-
-	fclose(source);
-	fclose(target);
-
-	return ret;
-}
-
-void handle_command(struct vehicle_command_s *cmd)
-{
-	/* result of the command */
-	uint8_t result = VEHICLE_CMD_RESULT_UNSUPPORTED;
-
-	/* request to set different system mode */
-	switch (cmd->command) {
-
-	case VEHICLE_CMD_PREFLIGHT_STORAGE:
-
-		if (((int)(cmd->param3)) == 1)	{
-
-			/* enable logging */
-			mavlink_log_info(mavlink_fd, "[log] file:");
-			mavlink_log_info(mavlink_fd, "logdir");
-			logging_enabled = true;
-		}
-		if (((int)(cmd->param3)) == 0)	{
-
-			/* disable logging */
-			mavlink_log_info(mavlink_fd, "[log] stopped.");
-			logging_enabled = false;
-		}
-		break;
-
-	default:
-		/* silently ignore */
-		break;
-	}
-
-}
diff --git a/src/modules/sdlog/sdlog_ringbuffer.h b/src/modules/sdlog/sdlog_ringbuffer.h
deleted file mode 100644
index b65916459..000000000
--- a/src/modules/sdlog/sdlog_ringbuffer.h
+++ /dev/null
@@ -1,91 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (C) 2013 PX4 Development Team. All rights reserved.
- *   Author: Lorenz Meier <lm@inf.ethz.ch>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/**
- * @file sdlog_ringbuffer.h
- * microSD logging
- *
- * @author Lorenz Meier <lm@inf.ethz.ch>
- */
-
-#ifndef SDLOG_RINGBUFFER_H_
-#define SDLOG_RINGBUFFER_H_
-
-#pragma pack(push, 1)
-struct sdlog_sysvector {
-	uint64_t timestamp;		/**<  time [us] */
-	float gyro[3];			/**< [rad/s] */
-	float accel[3];			/**< [m/s^2] */
-	float mag[3];			/**< [gauss] */
-	float baro;			/**< pressure [millibar] */
-	float baro_alt;			/**< altitude above MSL [meter] */
-	float baro_temp;		/**< [degree celcius] */
-	float control[4];		/**< roll, pitch, yaw [-1..1], thrust [0..1] */
-	float actuators[8];		/**< motor 1-8, in motor units (PWM: 1000-2000,AR.Drone: 0-512) */
-	float vbat;			/**< battery voltage in [volt] */
-	float bat_current;		/**< battery discharge current */
-	float bat_discharged;		/**< discharged energy in mAh */
-	float adc[4];			/**< ADC ports [volt] */
-	float local_position[3];	/**< tangent plane mapping into x,y,z [m] */
-	int32_t gps_raw_position[3];	/**< latitude [degrees] north, longitude [degrees] east, altitude above MSL [millimeter] */
-	float attitude[3];		/**< roll, pitch, yaw [rad] */
-	float rotMatrix[9];		/**< unitvectors */
-	float vicon[6];			/**< Vicon ground truth x, y, z and roll, pitch, yaw */
-	float control_effective[4]; 	/**< roll, pitch, yaw [-1..1], thrust [0..1] */
-	float flow[6];			/**< flow raw x, y, flow metric x, y, flow ground dist, flow quality */
-	float diff_pressure;		/**< differential pressure */
-	float ind_airspeed;		/**< indicated airspeed */
-	float true_airspeed;		/**< true airspeed */
-};
-#pragma pack(pop)
-
-struct sdlog_logbuffer {
-	unsigned int start;
-	// unsigned int end;
-	unsigned int size;
-	int count;
-	struct sdlog_sysvector *elems;
-};
-
-void sdlog_logbuffer_init(struct sdlog_logbuffer *lb, int size);
-
-int sdlog_logbuffer_is_full(struct sdlog_logbuffer *lb);
-
-int sdlog_logbuffer_is_empty(struct sdlog_logbuffer *lb);
-
-void sdlog_logbuffer_write(struct sdlog_logbuffer *lb, const struct sdlog_sysvector *elem);
-
-int sdlog_logbuffer_read(struct sdlog_logbuffer *lb, struct sdlog_sysvector *elem);
-
-#endif
diff --git a/src/modules/sdlog2/module.mk b/src/modules/sdlog2/module.mk
index f53129688..a28d43e72 100644
--- a/src/modules/sdlog2/module.mk
+++ b/src/modules/sdlog2/module.mk
@@ -41,3 +41,5 @@ MODULE_PRIORITY = "SCHED_PRIORITY_MAX-30"
 
 SRCS = sdlog2.c \
        logbuffer.c
+
+MODULE_STACKSIZE = 1200
diff --git a/src/modules/sdlog2/sdlog2.c b/src/modules/sdlog2/sdlog2.c
index 13981ac54..9b071ff99 100644
--- a/src/modules/sdlog2/sdlog2.c
+++ b/src/modules/sdlog2/sdlog2.c
@@ -84,9 +84,14 @@
 #include <uORB/topics/esc_status.h>
 #include <uORB/topics/telemetry_status.h>
 #include <uORB/topics/estimator_status.h>
+#include <uORB/topics/tecs_status.h>
+#include <uORB/topics/system_power.h>
+#include <uORB/topics/servorail_status.h>
+#include <uORB/topics/wind_estimate.h>
 
 #include <systemlib/systemlib.h>
 #include <systemlib/param/param.h>
+#include <systemlib/perf_counter.h>
 #include <version/version.h>
 
 #include <mavlink/mavlink_log.h>
@@ -95,6 +100,36 @@
 #include "sdlog2_format.h"
 #include "sdlog2_messages.h"
 
+/**
+ * Logging rate.
+ *
+ * A value of -1 indicates the commandline argument
+ * should be obeyed. A value of 0 sets the minimum rate,
+ * any other value is interpreted as rate in Hertz. This
+ * parameter is only read out before logging starts (which
+ * commonly is before arming).
+ *
+ * @min -1
+ * @max  1
+ * @group SD Logging
+ */
+PARAM_DEFINE_INT32(SDLOG_RATE, -1);
+
+/**
+ * Enable extended logging mode.
+ *
+ * A value of -1 indicates the commandline argument
+ * should be obeyed. A value of 0 disables extended
+ * logging mode, a value of 1 enables it. This
+ * parameter is only read out before logging starts
+ * (which commonly is before arming).
+ *
+ * @min -1
+ * @max  1
+ * @group SD Logging
+ */
+PARAM_DEFINE_INT32(SDLOG_EXT, -1);
+
 #define LOGBUFFER_WRITE_AND_COUNT(_msg) if (logbuffer_write(&lb, &log_msg, LOG_PACKET_SIZE(_msg))) { \
 		log_msgs_written++; \
 	} else { \
@@ -110,12 +145,14 @@ static bool main_thread_should_exit = false;		/**< Deamon exit flag */
 static bool thread_running = false;			/**< Deamon status flag */
 static int deamon_task;						/**< Handle of deamon task / thread */
 static bool logwriter_should_exit = false;	/**< Logwriter thread exit flag */
-static const int MAX_NO_LOGFOLDER = 999;	/**< Maximum number of log dirs */
-static const int MAX_NO_LOGFILE = 999;		/**< Maximum number of log files */
+static const unsigned MAX_NO_LOGFOLDER = 999;	/**< Maximum number of log dirs */
+static const unsigned MAX_NO_LOGFILE = 999;		/**< Maximum number of log files */
 static const int LOG_BUFFER_SIZE_DEFAULT = 8192;
 static const int MAX_WRITE_CHUNK = 512;
 static const int MIN_BYTES_TO_WRITE = 512;
 
+static bool _extended_logging = false;
+
 static const char *log_root = "/fs/microsd/log";
 static int mavlink_fd = -1;
 struct logbuffer_s lb;
@@ -216,6 +253,8 @@ static int create_log_dir(void);
  */
 static int open_log_file(void);
 
+static int open_perf_file(const char* str);
+
 static void
 sdlog2_usage(const char *reason)
 {
@@ -223,12 +262,13 @@ sdlog2_usage(const char *reason)
 		fprintf(stderr, "%s\n", reason);
 	}
 
-	errx(1, "usage: sdlog2 {start|stop|status} [-r <log rate>] [-b <buffer size>] -e -a -t\n"
-	     "\t-r\tLog rate in Hz, 0 means unlimited rate\n"
-	     "\t-b\tLog buffer size in KiB, default is 8\n"
-	     "\t-e\tEnable logging by default (if not, can be started by command)\n"
-	     "\t-a\tLog only when armed (can be still overriden by command)\n"
-	     "\t-t\tUse date/time for naming log directories and files\n");
+	errx(1, "usage: sdlog2 {start|stop|status} [-r <log rate>] [-b <buffer size>] -e -a -t -x\n"
+		 "\t-r\tLog rate in Hz, 0 means unlimited rate\n"
+		 "\t-b\tLog buffer size in KiB, default is 8\n"
+		 "\t-e\tEnable logging by default (if not, can be started by command)\n"
+		 "\t-a\tLog only when armed (can be still overriden by command)\n"
+		 "\t-t\tUse date/time for naming log directories and files\n"
+		 "\t-x\tExtended logging");
 }
 
 /**
@@ -255,11 +295,11 @@ int sdlog2_main(int argc, char *argv[])
 
 		main_thread_should_exit = false;
 		deamon_task = task_spawn_cmd("sdlog2",
-					     SCHED_DEFAULT,
-					     SCHED_PRIORITY_DEFAULT - 30,
-					     3000,
-					     sdlog2_thread_main,
-					     (const char **)argv);
+						 SCHED_DEFAULT,
+						 SCHED_PRIORITY_DEFAULT - 30,
+						 3000,
+						 sdlog2_thread_main,
+						 (const char **)argv);
 		exit(0);
 	}
 
@@ -347,8 +387,8 @@ int create_log_dir()
 int open_log_file()
 {
 	/* string to hold the path to the log */
-	char log_file_name[16] = "";
-	char log_file_path[48] = "";
+	char log_file_name[32] = "";
+	char log_file_path[64] = "";
 
 	if (log_name_timestamp && gps_time != 0) {
 		/* use GPS time for log file naming, e.g. /fs/microsd/2014-01-19/19_37_52.bin */
@@ -376,7 +416,7 @@ int open_log_file()
 
 		if (file_number > MAX_NO_LOGFILE) {
 			/* we should not end up here, either we have more than MAX_NO_LOGFILE on the SD card, or another problem */
-			warnx("all %d possible files exist already", MAX_NO_LOGFILE);
+			mavlink_log_critical(mavlink_fd, "[sdlog2] ERR: max files %d", MAX_NO_LOGFILE);
 			return -1;
 		}
 	}
@@ -385,7 +425,58 @@ int open_log_file()
 
 	if (fd < 0) {
 		warn("failed opening log: %s", log_file_name);
-		mavlink_log_info(mavlink_fd, "[sdlog2] failed opening log: %s", log_file_name);
+		mavlink_log_critical(mavlink_fd, "[sdlog2] failed opening log: %s", log_file_name);
+
+	} else {
+		warnx("log file: %s", log_file_name);
+		mavlink_log_info(mavlink_fd, "[sdlog2] log file: %s", log_file_name);
+	}
+
+	return fd;
+}
+
+int open_perf_file(const char* str)
+{
+	/* string to hold the path to the log */
+	char log_file_name[32] = "";
+	char log_file_path[64] = "";
+
+	if (log_name_timestamp && gps_time != 0) {
+		/* use GPS time for log file naming, e.g. /fs/microsd/2014-01-19/19_37_52.bin */
+		time_t gps_time_sec = gps_time / 1000000;
+		struct tm t;
+		gmtime_r(&gps_time_sec, &t);
+		strftime(log_file_name, sizeof(log_file_name), "perf%H_%M_%S.txt", &t);
+		snprintf(log_file_path, sizeof(log_file_path), "%s/%s_%s", log_dir, str, log_file_name);
+
+	} else {
+		unsigned file_number = 1; // start with file log001
+
+		/* look for the next file that does not exist */
+		while (file_number <= MAX_NO_LOGFILE) {
+			/* format log file path: e.g. /fs/microsd/sess001/log001.bin */
+			snprintf(log_file_name, sizeof(log_file_name), "perf%03u.txt", file_number);
+			snprintf(log_file_path, sizeof(log_file_path), "%s/%s_%s", log_dir, str, log_file_name);
+
+			if (!file_exist(log_file_path)) {
+				break;
+			}
+
+			file_number++;
+		}
+
+		if (file_number > MAX_NO_LOGFILE) {
+			/* we should not end up here, either we have more than MAX_NO_LOGFILE on the SD card, or another problem */
+			mavlink_log_critical(mavlink_fd, "[sdlog2] ERR: max files %d", MAX_NO_LOGFILE);
+			return -1;
+		}
+	}
+
+	int fd = open(log_file_path, O_CREAT | O_WRONLY | O_DSYNC);
+
+	if (fd < 0) {
+		warn("failed opening log: %s", log_file_name);
+		mavlink_log_critical(mavlink_fd, "[sdlog2] failed opening log: %s", log_file_name);
 
 	} else {
 		warnx("log file: %s", log_file_name);
@@ -527,6 +618,12 @@ void sdlog2_start_log()
 		errx(1, "error creating logwriter thread");
 	}
 
+	/* write all performance counters */
+	int perf_fd = open_perf_file("preflight");
+	dprintf(perf_fd, "PERFORMANCE COUNTERS PRE-FLIGHT\n\n");
+	perf_print_all(perf_fd);
+	close(perf_fd);
+
 	logging_enabled = true;
 }
 
@@ -554,6 +651,12 @@ void sdlog2_stop_log()
 	logwriter_pthread = 0;
 	pthread_attr_destroy(&logwriter_attr);
 
+	/* write all performance counters */
+	int perf_fd = open_perf_file("postflight");
+	dprintf(perf_fd, "PERFORMANCE COUNTERS POST-FLIGHT\n\n");
+	perf_print_all(perf_fd);
+	close(perf_fd);
+
 	sdlog2_status();
 }
 
@@ -570,7 +673,7 @@ int write_formats(int fd)
 	int written = 0;
 
 	/* fill message format packet for each format and write it */
-	for (int i = 0; i < log_formats_num; i++) {
+	for (unsigned i = 0; i < log_formats_num; i++) {
 		log_msg_format.body = log_formats[i];
 		written += write(fd, &log_msg_format, sizeof(log_msg_format));
 	}
@@ -677,12 +780,12 @@ int sdlog2_thread_main(int argc, char *argv[])
 	 * set error flag instead */
 	bool err_flag = false;
 
-	while ((ch = getopt(argc, argv, "r:b:eat")) != EOF) {
+	while ((ch = getopt(argc, argv, "r:b:eatx")) != EOF) {
 		switch (ch) {
 		case 'r': {
 				unsigned long r = strtoul(optarg, NULL, 10);
 
-				if (r <= 0) {
+				if (r == 0) {
 					r = 1;
 				}
 
@@ -713,6 +816,10 @@ int sdlog2_thread_main(int argc, char *argv[])
 			log_name_timestamp = true;
 			break;
 
+		case 'x':
+			_extended_logging = true;
+			break;
+
 		case '?':
 			if (optopt == 'c') {
 				warnx("option -%c requires an argument", optopt);
@@ -739,6 +846,44 @@ int sdlog2_thread_main(int argc, char *argv[])
 
 	gps_time = 0;
 
+	/* interpret logging params */
+
+	param_t log_rate_ph = param_find("SDLOG_RATE");
+
+	if (log_rate_ph != PARAM_INVALID) {
+		int32_t param_log_rate;
+		param_get(log_rate_ph, &param_log_rate);
+
+		if (param_log_rate > 0) {
+
+			/* we can't do more than ~ 500 Hz, even with a massive buffer */
+			if (param_log_rate > 500) {
+				param_log_rate = 500;
+			}
+
+			sleep_delay = 1000000 / param_log_rate;
+		} else if (param_log_rate == 0) {
+			/* we need at minimum 10 Hz to be able to see anything */
+			sleep_delay = 1000000 / 10;
+		}
+	}
+
+	param_t log_ext_ph = param_find("SDLOG_EXT");
+
+	if (log_ext_ph != PARAM_INVALID) {
+
+		int32_t param_log_extended;
+		param_get(log_ext_ph, &param_log_extended);
+
+		if (param_log_extended > 0) {
+			_extended_logging = true;
+		} else if (param_log_extended == 0) {
+			_extended_logging = false;
+		}
+		/* any other value means to ignore the parameter, so no else case */
+
+	}
+
 	/* create log root dir */
 	int mkdir_ret = mkdir(log_root, S_IRWXU | S_IRWXG | S_IRWXO);
 
@@ -796,6 +941,10 @@ int sdlog2_thread_main(int argc, char *argv[])
 		struct telemetry_status_s telemetry;
 		struct range_finder_report range_finder;
 		struct estimator_status_report estimator_status;
+		struct tecs_status_s tecs_status;
+		struct system_power_s system_power;
+		struct servorail_status_s servorail_status;
+		struct wind_estimate_s wind_estimate;
 	} buf;
 
 	memset(&buf, 0, sizeof(buf));
@@ -827,7 +976,16 @@ int sdlog2_thread_main(int argc, char *argv[])
 			struct log_BATT_s log_BATT;
 			struct log_DIST_s log_DIST;
 			struct log_TELE_s log_TELE;
-			struct log_ESTM_s log_ESTM;
+			struct log_EST0_s log_EST0;
+			struct log_EST1_s log_EST1;
+			struct log_PWR_s log_PWR;
+			struct log_VICN_s log_VICN;
+			struct log_GS0A_s log_GS0A;
+			struct log_GS0B_s log_GS0B;
+			struct log_GS1A_s log_GS1A;
+			struct log_GS1B_s log_GS1B;
+			struct log_TECS_s log_TECS;
+			struct log_WIND_s log_WIND;
 		} body;
 	} log_msg = {
 		LOG_PACKET_HEADER_INIT(0)
@@ -859,6 +1017,10 @@ int sdlog2_thread_main(int argc, char *argv[])
 		int telemetry_sub;
 		int range_finder_sub;
 		int estimator_status_sub;
+		int tecs_status_sub;
+		int system_power_sub;
+		int servorail_status_sub;
+		int wind_sub;
 	} subs;
 
 	subs.cmd_sub = orb_subscribe(ORB_ID(vehicle_command));
@@ -884,6 +1046,12 @@ int sdlog2_thread_main(int argc, char *argv[])
 	subs.telemetry_sub = orb_subscribe(ORB_ID(telemetry_status));
 	subs.range_finder_sub = orb_subscribe(ORB_ID(sensor_range_finder));
 	subs.estimator_status_sub = orb_subscribe(ORB_ID(estimator_status));
+	subs.tecs_status_sub = orb_subscribe(ORB_ID(tecs_status));
+	subs.system_power_sub = orb_subscribe(ORB_ID(system_power));
+	subs.servorail_status_sub = orb_subscribe(ORB_ID(servorail_status));
+	subs.wind_sub = orb_subscribe(ORB_ID(wind_estimate));
+	/* we need to rate-limit wind, as we do not need the full update rate */
+	orb_set_interval(subs.wind_sub, 90);
 
 	thread_running = true;
 
@@ -898,9 +1066,6 @@ int sdlog2_thread_main(int argc, char *argv[])
 	hrt_abstime barometer_timestamp = 0;
 	hrt_abstime differential_pressure_timestamp = 0;
 
-	/* track changes in distance status */
-	bool dist_bottom_present = false;
-
 	/* enable logging on start if needed */
 	if (log_on_start) {
 		/* check GPS topic to get GPS time */
@@ -953,19 +1118,29 @@ int sdlog2_thread_main(int argc, char *argv[])
 			log_msg.msg_type = LOG_STAT_MSG;
 			log_msg.body.log_STAT.main_state = (uint8_t) buf_status.main_state;
 			log_msg.body.log_STAT.arming_state = (uint8_t) buf_status.arming_state;
+			log_msg.body.log_STAT.failsafe_state = (uint8_t) buf_status.failsafe;
 			log_msg.body.log_STAT.battery_remaining = buf_status.battery_remaining;
 			log_msg.body.log_STAT.battery_warning = (uint8_t) buf_status.battery_warning;
 			log_msg.body.log_STAT.landed = (uint8_t) buf_status.condition_landed;
 			LOGBUFFER_WRITE_AND_COUNT(STAT);
 		}
 
-		/* --- GPS POSITION --- */
+		/* --- GPS POSITION - UNIT #1 --- */
 		if (gps_pos_updated) {
+
+			float snr_mean = 0.0f;
+
+			for (unsigned i = 0; i < buf_gps_pos.satellites_visible; i++) {
+				snr_mean += buf_gps_pos.satellite_snr[i];
+			}
+
+			snr_mean /= buf_gps_pos.satellites_visible;
+
 			log_msg.msg_type = LOG_GPS_MSG;
 			log_msg.body.log_GPS.gps_time = buf_gps_pos.time_gps_usec;
 			log_msg.body.log_GPS.fix_type = buf_gps_pos.fix_type;
-			log_msg.body.log_GPS.eph = buf_gps_pos.eph_m;
-			log_msg.body.log_GPS.epv = buf_gps_pos.epv_m;
+			log_msg.body.log_GPS.eph = buf_gps_pos.eph;
+			log_msg.body.log_GPS.epv = buf_gps_pos.epv;
 			log_msg.body.log_GPS.lat = buf_gps_pos.lat;
 			log_msg.body.log_GPS.lon = buf_gps_pos.lon;
 			log_msg.body.log_GPS.alt = buf_gps_pos.alt * 0.001f;
@@ -973,7 +1148,48 @@ int sdlog2_thread_main(int argc, char *argv[])
 			log_msg.body.log_GPS.vel_e = buf_gps_pos.vel_e_m_s;
 			log_msg.body.log_GPS.vel_d = buf_gps_pos.vel_d_m_s;
 			log_msg.body.log_GPS.cog = buf_gps_pos.cog_rad;
+			log_msg.body.log_GPS.sats = buf_gps_pos.satellites_visible;
+			log_msg.body.log_GPS.snr_mean = snr_mean;
+			log_msg.body.log_GPS.noise_per_ms = buf_gps_pos.noise_per_ms;
+			log_msg.body.log_GPS.jamming_indicator = buf_gps_pos.jamming_indicator;
 			LOGBUFFER_WRITE_AND_COUNT(GPS);
+
+			if (_extended_logging) {
+				/* log the SNR of each satellite for a detailed view of signal quality */
+				unsigned gps_msg_max_snr = sizeof(buf_gps_pos.satellite_snr) / sizeof(buf_gps_pos.satellite_snr[0]);
+				unsigned log_max_snr = sizeof(log_msg.body.log_GS0A.satellite_snr) / sizeof(log_msg.body.log_GS0A.satellite_snr[0]);
+
+				log_msg.msg_type = LOG_GS0A_MSG;
+				memset(&log_msg.body.log_GS0A, 0, sizeof(log_msg.body.log_GS0A));
+				/* fill set A */
+				for (unsigned i = 0; i < gps_msg_max_snr; i++) {
+
+					int satindex = buf_gps_pos.satellite_prn[i] - 1;
+
+					/* handles index exceeding and wraps to to arithmetic errors */
+					if ((satindex >= 0) && (satindex < (int)log_max_snr)) {
+						/* map satellites by their ID so that logs from two receivers can be compared */
+						log_msg.body.log_GS0A.satellite_snr[satindex] = buf_gps_pos.satellite_snr[i];
+					}
+				}
+				LOGBUFFER_WRITE_AND_COUNT(GS0A);
+
+				log_msg.msg_type = LOG_GS0B_MSG;
+				memset(&log_msg.body.log_GS0B, 0, sizeof(log_msg.body.log_GS0B));
+				/* fill set B */
+				for (unsigned i = 0; i < gps_msg_max_snr; i++) {
+
+					/* get second bank of satellites, thus deduct bank size from index */
+					int satindex = buf_gps_pos.satellite_prn[i] - 1 - log_max_snr;
+
+					/* handles index exceeding and wraps to to arithmetic errors */
+					if ((satindex >= 0) && (satindex < (int)log_max_snr)) {
+						/* map satellites by their ID so that logs from two receivers can be compared */
+						log_msg.body.log_GS0B.satellite_snr[satindex] = buf_gps_pos.satellite_snr[i];
+					}
+				}
+				LOGBUFFER_WRITE_AND_COUNT(GS0B);
+			}
 		}
 
 		/* --- SENSOR COMBINED --- */
@@ -1089,28 +1305,25 @@ int sdlog2_thread_main(int argc, char *argv[])
 			log_msg.body.log_LPOS.x = buf.local_pos.x;
 			log_msg.body.log_LPOS.y = buf.local_pos.y;
 			log_msg.body.log_LPOS.z = buf.local_pos.z;
+			log_msg.body.log_LPOS.ground_dist = buf.local_pos.dist_bottom;
+			log_msg.body.log_LPOS.ground_dist_rate = buf.local_pos.dist_bottom_rate;
 			log_msg.body.log_LPOS.vx = buf.local_pos.vx;
 			log_msg.body.log_LPOS.vy = buf.local_pos.vy;
 			log_msg.body.log_LPOS.vz = buf.local_pos.vz;
-			log_msg.body.log_LPOS.ref_lat = buf.local_pos.ref_lat;
-			log_msg.body.log_LPOS.ref_lon = buf.local_pos.ref_lon;
+			log_msg.body.log_LPOS.ref_lat = buf.local_pos.ref_lat * 1e7;
+			log_msg.body.log_LPOS.ref_lon = buf.local_pos.ref_lon * 1e7;
 			log_msg.body.log_LPOS.ref_alt = buf.local_pos.ref_alt;
-			log_msg.body.log_LPOS.xy_flags = (buf.local_pos.xy_valid ? 1 : 0) | (buf.local_pos.v_xy_valid ? 2 : 0) | (buf.local_pos.xy_global ? 8 : 0);
-			log_msg.body.log_LPOS.z_flags = (buf.local_pos.z_valid ? 1 : 0) | (buf.local_pos.v_z_valid ? 2 : 0) | (buf.local_pos.z_global ? 8 : 0);
+			log_msg.body.log_LPOS.pos_flags = (buf.local_pos.xy_valid ? 1 : 0) |
+											  (buf.local_pos.z_valid ? 2 : 0) |
+											  (buf.local_pos.v_xy_valid ? 4 : 0) |
+											  (buf.local_pos.v_z_valid ? 8 : 0) |
+											  (buf.local_pos.xy_global ? 16 : 0) |
+											  (buf.local_pos.z_global ? 32 : 0);
 			log_msg.body.log_LPOS.landed = buf.local_pos.landed;
+			log_msg.body.log_LPOS.ground_dist_flags = (buf.local_pos.dist_bottom_valid ? 1 : 0);
+			log_msg.body.log_LPOS.eph = buf.local_pos.eph;
+			log_msg.body.log_LPOS.epv = buf.local_pos.epv;
 			LOGBUFFER_WRITE_AND_COUNT(LPOS);
-
-			if (buf.local_pos.dist_bottom_valid) {
-				dist_bottom_present = true;
-			}
-
-			if (dist_bottom_present) {
-				log_msg.msg_type = LOG_DIST_MSG;
-				log_msg.body.log_DIST.bottom = buf.local_pos.dist_bottom;
-				log_msg.body.log_DIST.bottom_rate = buf.local_pos.dist_bottom_rate;
-				log_msg.body.log_DIST.flags = (buf.local_pos.dist_bottom_valid ? 1 : 0);
-				LOGBUFFER_WRITE_AND_COUNT(DIST);
-			}
 		}
 
 		/* --- LOCAL POSITION SETPOINT --- */
@@ -1132,15 +1345,15 @@ int sdlog2_thread_main(int argc, char *argv[])
 			log_msg.body.log_GPOS.vel_n = buf.global_pos.vel_n;
 			log_msg.body.log_GPOS.vel_e = buf.global_pos.vel_e;
 			log_msg.body.log_GPOS.vel_d = buf.global_pos.vel_d;
-			log_msg.body.log_GPOS.baro_alt = buf.global_pos.baro_alt;
-			log_msg.body.log_GPOS.flags = (buf.global_pos.baro_valid ? 1 : 0) | (buf.global_pos.global_valid ? 2 : 0);
+			log_msg.body.log_GPOS.eph = buf.global_pos.eph;
+			log_msg.body.log_GPOS.epv = buf.global_pos.epv;
 			LOGBUFFER_WRITE_AND_COUNT(GPOS);
 		}
 
 		/* --- GLOBAL POSITION SETPOINT --- */
 		if (copy_if_updated(ORB_ID(position_setpoint_triplet), subs.triplet_sub, &buf.triplet)) {
 			log_msg.msg_type = LOG_GPSP_MSG;
-			log_msg.body.log_GPSP.nav_state = buf.triplet.nav_state;
+			log_msg.body.log_GPSP.nav_state = 0;  /* TODO: Fix this */
 			log_msg.body.log_GPSP.lat = (int32_t)(buf.triplet.current.lat * 1e7d);
 			log_msg.body.log_GPSP.lon = (int32_t)(buf.triplet.current.lon * 1e7d);
 			log_msg.body.log_GPSP.alt = buf.triplet.current.alt;
@@ -1154,7 +1367,14 @@ int sdlog2_thread_main(int argc, char *argv[])
 
 		/* --- VICON POSITION --- */
 		if (copy_if_updated(ORB_ID(vehicle_vicon_position), subs.vicon_pos_sub, &buf.vicon_pos)) {
-			// TODO not implemented yet
+			log_msg.msg_type = LOG_VICN_MSG;
+			log_msg.body.log_VICN.x = buf.vicon_pos.x;
+			log_msg.body.log_VICN.y = buf.vicon_pos.y;
+			log_msg.body.log_VICN.z = buf.vicon_pos.z;
+			log_msg.body.log_VICN.pitch = buf.vicon_pos.pitch;
+			log_msg.body.log_VICN.roll = buf.vicon_pos.roll;
+			log_msg.body.log_VICN.yaw = buf.vicon_pos.yaw;
+			LOGBUFFER_WRITE_AND_COUNT(VICN);
 		}
 
 		/* --- FLOW --- */
@@ -1174,8 +1394,9 @@ int sdlog2_thread_main(int argc, char *argv[])
 		if (copy_if_updated(ORB_ID(rc_channels), subs.rc_sub, &buf.rc)) {
 			log_msg.msg_type = LOG_RC_MSG;
 			/* Copy only the first 8 channels of 14 */
-			memcpy(log_msg.body.log_RC.channel, buf.rc.chan, sizeof(log_msg.body.log_RC.channel));
-			log_msg.body.log_RC.channel_count = buf.rc.chan_count;
+			memcpy(log_msg.body.log_RC.channel, buf.rc.channels, sizeof(log_msg.body.log_RC.channel));
+			log_msg.body.log_RC.channel_count = buf.rc.channel_count;
+			log_msg.body.log_RC.signal_lost = buf.rc.signal_lost;
 			LOGBUFFER_WRITE_AND_COUNT(RC);
 		}
 
@@ -1184,6 +1405,7 @@ int sdlog2_thread_main(int argc, char *argv[])
 			log_msg.msg_type = LOG_AIRS_MSG;
 			log_msg.body.log_AIRS.indicated_airspeed = buf.airspeed.indicated_airspeed_m_s;
 			log_msg.body.log_AIRS.true_airspeed = buf.airspeed.true_airspeed_m_s;
+			log_msg.body.log_AIRS.air_temperature_celsius = buf.airspeed.air_temperature_celsius;
 			LOGBUFFER_WRITE_AND_COUNT(AIRS);
 		}
 
@@ -1226,6 +1448,24 @@ int sdlog2_thread_main(int argc, char *argv[])
 			LOGBUFFER_WRITE_AND_COUNT(BATT);
 		}
 
+		/* --- SYSTEM POWER RAILS --- */
+		if (copy_if_updated(ORB_ID(system_power), subs.system_power_sub, &buf.system_power)) {
+			log_msg.msg_type = LOG_PWR_MSG;
+			log_msg.body.log_PWR.peripherals_5v = buf.system_power.voltage5V_v;
+			log_msg.body.log_PWR.usb_ok = buf.system_power.usb_connected;
+			log_msg.body.log_PWR.brick_ok = buf.system_power.brick_valid;
+			log_msg.body.log_PWR.servo_ok = buf.system_power.servo_valid;
+			log_msg.body.log_PWR.low_power_rail_overcurrent = buf.system_power.periph_5V_OC;
+			log_msg.body.log_PWR.high_power_rail_overcurrent = buf.system_power.hipower_5V_OC;
+
+			/* copy servo rail status topic here too */
+			orb_copy(ORB_ID(servorail_status), subs.servorail_status_sub, &buf.servorail_status);
+			log_msg.body.log_PWR.servo_rail_5v = buf.servorail_status.voltage_v;
+			log_msg.body.log_PWR.servo_rssi = buf.servorail_status.rssi_v;
+
+			LOGBUFFER_WRITE_AND_COUNT(PWR);
+		}
+
 		/* --- TELEMETRY --- */
 		if (copy_if_updated(ORB_ID(telemetry_status), subs.telemetry_sub, &buf.telemetry)) {
 			log_msg.msg_type = LOG_TELE_MSG;
@@ -1250,15 +1490,52 @@ int sdlog2_thread_main(int argc, char *argv[])
 
 		/* --- ESTIMATOR STATUS --- */
 		if (copy_if_updated(ORB_ID(estimator_status), subs.estimator_status_sub, &buf.estimator_status)) {
-			log_msg.msg_type = LOG_ESTM_MSG;
-			unsigned maxcopy = (sizeof(buf.estimator_status.states) < sizeof(log_msg.body.log_ESTM.s)) ? sizeof(buf.estimator_status.states) : sizeof(log_msg.body.log_ESTM.s);
-			memset(&(log_msg.body.log_ESTM.s), 0, sizeof(log_msg.body.log_ESTM.s));
-			memcpy(&(log_msg.body.log_ESTM.s), buf.estimator_status.states, maxcopy);
-			log_msg.body.log_ESTM.n_states = buf.estimator_status.n_states;
-			log_msg.body.log_ESTM.states_nan = buf.estimator_status.states_nan;
-			log_msg.body.log_ESTM.covariance_nan = buf.estimator_status.covariance_nan;
-			log_msg.body.log_ESTM.kalman_gain_nan = buf.estimator_status.kalman_gain_nan;
-			LOGBUFFER_WRITE_AND_COUNT(ESTM);
+			log_msg.msg_type = LOG_EST0_MSG;
+			unsigned maxcopy0 = (sizeof(buf.estimator_status.states) < sizeof(log_msg.body.log_EST0.s)) ? sizeof(buf.estimator_status.states) : sizeof(log_msg.body.log_EST0.s);
+			memset(&(log_msg.body.log_EST0.s), 0, sizeof(log_msg.body.log_EST0.s));
+			memcpy(&(log_msg.body.log_EST0.s), buf.estimator_status.states, maxcopy0);
+			log_msg.body.log_EST0.n_states = buf.estimator_status.n_states;
+			log_msg.body.log_EST0.nan_flags = buf.estimator_status.nan_flags;
+			log_msg.body.log_EST0.health_flags = buf.estimator_status.health_flags;
+			log_msg.body.log_EST0.timeout_flags = buf.estimator_status.timeout_flags;
+			LOGBUFFER_WRITE_AND_COUNT(EST0);
+
+			log_msg.msg_type = LOG_EST1_MSG;
+			unsigned maxcopy1 = ((sizeof(buf.estimator_status.states) - maxcopy0) < sizeof(log_msg.body.log_EST1.s)) ? (sizeof(buf.estimator_status.states) - maxcopy0) : sizeof(log_msg.body.log_EST1.s);
+			memset(&(log_msg.body.log_EST1.s), 0, sizeof(log_msg.body.log_EST1.s));
+			memcpy(&(log_msg.body.log_EST1.s), buf.estimator_status.states + maxcopy0, maxcopy1);
+			LOGBUFFER_WRITE_AND_COUNT(EST1);
+		}
+
+		/* --- TECS STATUS --- */
+		if (copy_if_updated(ORB_ID(tecs_status), subs.tecs_status_sub, &buf.tecs_status)) {
+			log_msg.msg_type = LOG_TECS_MSG;
+			log_msg.body.log_TECS.altitudeSp = buf.tecs_status.altitudeSp;
+			log_msg.body.log_TECS.altitude = buf.tecs_status.altitude;
+			log_msg.body.log_TECS.flightPathAngleSp = buf.tecs_status.flightPathAngleSp;
+			log_msg.body.log_TECS.flightPathAngle = buf.tecs_status.flightPathAngle;
+			log_msg.body.log_TECS.flightPathAngleFiltered = buf.tecs_status.flightPathAngleFiltered;
+			log_msg.body.log_TECS.airspeedSp = buf.tecs_status.airspeedSp;
+			log_msg.body.log_TECS.airspeed = buf.tecs_status.airspeed;
+			log_msg.body.log_TECS.airspeedFiltered = buf.tecs_status.airspeedFiltered;
+			log_msg.body.log_TECS.airspeedDerivativeSp = buf.tecs_status.airspeedDerivativeSp;
+			log_msg.body.log_TECS.airspeedDerivative = buf.tecs_status.airspeedDerivative;
+			log_msg.body.log_TECS.totalEnergyRateSp = buf.tecs_status.totalEnergyRateSp;
+			log_msg.body.log_TECS.totalEnergyRate = buf.tecs_status.totalEnergyRate;
+			log_msg.body.log_TECS.energyDistributionRateSp = buf.tecs_status.energyDistributionRateSp;
+			log_msg.body.log_TECS.energyDistributionRate = buf.tecs_status.energyDistributionRate;
+			log_msg.body.log_TECS.mode = (uint8_t)buf.tecs_status.mode;
+			LOGBUFFER_WRITE_AND_COUNT(TECS);
+		}
+
+		/* --- WIND ESTIMATE --- */
+		if (copy_if_updated(ORB_ID(wind_estimate), subs.wind_sub, &buf.wind_estimate)) {
+			log_msg.msg_type = LOG_WIND_MSG;
+			log_msg.body.log_WIND.x = buf.wind_estimate.windspeed_north;
+			log_msg.body.log_WIND.y = buf.wind_estimate.windspeed_east;
+			log_msg.body.log_WIND.cov_x = buf.wind_estimate.covariance_north;
+			log_msg.body.log_WIND.cov_y = buf.wind_estimate.covariance_east;
+			LOGBUFFER_WRITE_AND_COUNT(WIND);
 		}
 
 		/* signal the other thread new data, but not yet unlock */
@@ -1294,6 +1571,7 @@ void sdlog2_status()
 	float seconds = ((float)(hrt_absolute_time() - start_time)) / 1000000.0f;
 
 	warnx("wrote %lu msgs, %4.2f MiB (average %5.3f KiB/s), skipped %lu msgs", log_msgs_written, (double)mebibytes, (double)(kibibytes / seconds), log_msgs_skipped);
+	warnx("extended logging: %s", (_extended_logging) ? "ON" : "OFF");
 	mavlink_log_info(mavlink_fd, "[sdlog2] wrote %lu msgs, skipped %lu msgs", log_msgs_written, log_msgs_skipped);
 }
 
diff --git a/src/modules/sdlog2/sdlog2_messages.h b/src/modules/sdlog2/sdlog2_messages.h
index 2b41755de..8c05e87c5 100644
--- a/src/modules/sdlog2/sdlog2_messages.h
+++ b/src/modules/sdlog2/sdlog2_messages.h
@@ -101,15 +101,19 @@ struct log_LPOS_s {
 	float x;
 	float y;
 	float z;
+	float ground_dist;
+	float ground_dist_rate;
 	float vx;
 	float vy;
 	float vz;
 	int32_t ref_lat;
 	int32_t ref_lon;
 	float ref_alt;
-	uint8_t xy_flags;
-	uint8_t z_flags;
+	uint8_t pos_flags;
 	uint8_t landed;
+	uint8_t ground_dist_flags;
+	float eph;
+	float epv;
 };
 
 /* --- LPSP - LOCAL POSITION SETPOINT --- */
@@ -135,6 +139,10 @@ struct log_GPS_s {
 	float vel_e;
 	float vel_d;
 	float cog;
+	uint8_t sats;
+	uint16_t snr_mean;
+	uint16_t noise_per_ms;
+	uint16_t jamming_indicator;
 };
 
 /* --- ATTC - ATTITUDE CONTROLS (ACTUATOR_0 CONTROLS)--- */
@@ -151,6 +159,7 @@ struct log_ATTC_s {
 struct log_STAT_s {
 	uint8_t main_state;
 	uint8_t arming_state;
+	uint8_t failsafe_state;
 	float battery_remaining;
 	uint8_t battery_warning;
 	uint8_t landed;
@@ -161,6 +170,7 @@ struct log_STAT_s {
 struct log_RC_s {
 	float channel[8];
 	uint8_t channel_count;
+	uint8_t signal_lost;
 };
 
 /* --- OUT0 - ACTUATOR_0 OUTPUT --- */
@@ -174,6 +184,7 @@ struct log_OUT0_s {
 struct log_AIRS_s {
 	float indicated_airspeed;
 	float true_airspeed;
+	float air_temperature_celsius;
 };
 
 /* --- ARSP - ATTITUDE RATE SET POINT --- */
@@ -205,8 +216,8 @@ struct log_GPOS_s {
 	float vel_n;
 	float vel_e;
 	float vel_d;
-	float baro_alt;
-	uint8_t flags;
+	float eph;
+	float epv;
 };
 
 /* --- GPSP - GLOBAL POSITION SETPOINT --- */
@@ -277,6 +288,103 @@ struct log_TELE_s {
 	uint8_t txbuf;
 };
 
+// ID 23 available
+
+/* --- PWR - ONBOARD POWER SYSTEM --- */
+#define LOG_PWR_MSG 24
+struct log_PWR_s {
+	float peripherals_5v;
+	float servo_rail_5v;
+	float servo_rssi;
+	uint8_t usb_ok;
+	uint8_t brick_ok;
+	uint8_t servo_ok;
+	uint8_t low_power_rail_overcurrent;
+	uint8_t high_power_rail_overcurrent;
+};
+
+/* --- VICN - VICON POSITION --- */
+#define LOG_VICN_MSG 25
+struct log_VICN_s {
+	float x;
+	float y;
+	float z;
+	float roll;
+	float pitch;
+	float yaw;
+};
+
+/* --- GS0A - GPS SNR #0, SAT GROUP A --- */
+#define LOG_GS0A_MSG 26
+struct log_GS0A_s {
+	uint8_t satellite_snr[16];			/**< dBHz, Signal to noise ratio of satellite C/N0, range 0..99 */
+};
+
+/* --- GS0B - GPS SNR #0, SAT GROUP B --- */
+#define LOG_GS0B_MSG 27
+struct log_GS0B_s {
+	uint8_t satellite_snr[16];			/**< dBHz, Signal to noise ratio of satellite C/N0, range 0..99 */
+};
+
+/* --- GS1A - GPS SNR #1, SAT GROUP A --- */
+#define LOG_GS1A_MSG 28
+struct log_GS1A_s {
+	uint8_t satellite_snr[16];			/**< dBHz, Signal to noise ratio of satellite C/N0, range 0..99 */
+};
+
+/* --- GS1B - GPS SNR #1, SAT GROUP B --- */
+#define LOG_GS1B_MSG 29
+struct log_GS1B_s {
+	uint8_t satellite_snr[16];			/**< dBHz, Signal to noise ratio of satellite C/N0, range 0..99 */
+};
+
+/* --- TECS - TECS STATUS --- */
+#define LOG_TECS_MSG 30
+struct log_TECS_s {
+	float altitudeSp;
+	float altitude;
+	float flightPathAngleSp;
+	float flightPathAngle;
+	float flightPathAngleFiltered;
+	float airspeedSp;
+	float airspeed;
+	float airspeedFiltered;
+	float airspeedDerivativeSp;
+	float airspeedDerivative;
+
+	float totalEnergyRateSp;
+	float totalEnergyRate;
+	float energyDistributionRateSp;
+	float energyDistributionRate;
+
+	uint8_t mode;
+};
+
+/* --- WIND - WIND ESTIMATE --- */
+#define LOG_WIND_MSG 31
+struct log_WIND_s {
+	float x;
+	float y;
+	float cov_x;
+	float cov_y;
+};
+
+/* --- EST0 - ESTIMATOR STATUS --- */
+#define LOG_EST0_MSG 32
+struct log_EST0_s {
+	float s[12];
+	uint8_t n_states;
+	uint8_t nan_flags;
+	uint8_t health_flags;
+	uint8_t timeout_flags;
+};
+
+/* --- EST1 - ESTIMATOR STATUS --- */
+#define LOG_EST1_MSG 33
+struct log_EST1_s {
+	float s[16];
+};
+
 /********** SYSTEM MESSAGES, ID > 0x80 **********/
 
 /* --- TIME - TIME STAMP --- */
@@ -299,51 +407,50 @@ struct log_PARM_s {
 	float value;
 };
 
-/* --- ESTM - ESTIMATOR STATUS --- */
-#define LOG_ESTM_MSG 132
-struct log_ESTM_s {
-	float s[32];
-	uint8_t n_states;
-	uint8_t states_nan;
-	uint8_t covariance_nan;
-	uint8_t kalman_gain_nan;
-};
-
 #pragma pack(pop)
 
 /* construct list of all message formats */
 static const struct log_format_s log_formats[] = {
 	/* business-level messages, ID < 0x80 */
-	LOG_FORMAT(ATT, "fffffffff", "Roll,Pitch,Yaw,RollRate,PitchRate,YawRate,GX,GY,GZ"),
-	LOG_FORMAT(ATSP, "ffff", "RollSP,PitchSP,YawSP,ThrustSP"),
-	LOG_FORMAT(IMU, "fffffffff", "AccX,AccY,AccZ,GyroX,GyroY,GyroZ,MagX,MagY,MagZ"),
-	LOG_FORMAT(SENS, "fffff", "BaroPres,BaroAlt,BaroTemp,DiffPres,DiffPresFilt"),
-	LOG_FORMAT(LPOS, "ffffffLLfBBB", "X,Y,Z,VX,VY,VZ,RefLat,RefLon,RefAlt,XYFlags,ZFlags,Landed"),
-	LOG_FORMAT(LPSP, "ffff", "X,Y,Z,Yaw"),
-	LOG_FORMAT(GPS, "QBffLLfffff", "GPSTime,FixType,EPH,EPV,Lat,Lon,Alt,VelN,VelE,VelD,Cog"),
-	LOG_FORMAT(ATTC, "ffff", "Roll,Pitch,Yaw,Thrust"),
-	LOG_FORMAT(STAT, "BBfBB", "MainState,ArmState,BatRem,BatWarn,Landed"),
-	LOG_FORMAT(RC, "ffffffffB", "Ch0,Ch1,Ch2,Ch3,Ch4,Ch5,Ch6,Ch7,Count"),
-	LOG_FORMAT(OUT0, "ffffffff", "Out0,Out1,Out2,Out3,Out4,Out5,Out6,Out7"),
-	LOG_FORMAT(AIRS, "ff", "IndSpeed,TrueSpeed"),
-	LOG_FORMAT(ARSP, "fff", "RollRateSP,PitchRateSP,YawRateSP"),
-	LOG_FORMAT(FLOW, "hhfffBB", "RawX,RawY,CompX,CompY,Dist,Q,SensID"),
-	LOG_FORMAT(GPOS, "LLfffffB", "Lat,Lon,Alt,VelN,VelE,VelD,BaroAlt,Flags"),
-	LOG_FORMAT(GPSP, "BLLffBfbf", "NavState,Lat,Lon,Alt,Yaw,Type,LoitR,LoitDir,PitMin"),
-	LOG_FORMAT(ESC, "HBBBHHHHHHfH", "Counter,NumESC,Conn,N,Ver,Adr,Volt,Amp,RPM,Temp,SetP,SetPRAW"),
-	LOG_FORMAT(GVSP, "fff", "VX,VY,VZ"),
-	LOG_FORMAT(BATT, "ffff", "V,VFilt,C,Discharged"),
-	LOG_FORMAT(DIST, "ffB", "Bottom,BottomRate,Flags"),
-	LOG_FORMAT(TELE, "BBBBHHB", "RSSI,RemRSSI,Noise,RemNoise,RXErr,Fixed,TXBuf"),
+	LOG_FORMAT(ATT, "fffffffff",		"Roll,Pitch,Yaw,RollRate,PitchRate,YawRate,GX,GY,GZ"),
+	LOG_FORMAT(ATSP, "ffff",		"RollSP,PitchSP,YawSP,ThrustSP"),
+	LOG_FORMAT(IMU, "fffffffff",		"AccX,AccY,AccZ,GyroX,GyroY,GyroZ,MagX,MagY,MagZ"),
+	LOG_FORMAT(SENS, "fffff",		"BaroPres,BaroAlt,BaroTemp,DiffPres,DiffPresFilt"),
+	LOG_FORMAT(LPOS, "ffffffffLLfBBBff",	"X,Y,Z,Dist,DistR,VX,VY,VZ,RLat,RLon,RAlt,PFlg,LFlg,GFlg,EPH,EPV"),
+	LOG_FORMAT(LPSP, "ffff",		"X,Y,Z,Yaw"),
+	LOG_FORMAT(GPS, "QBffLLfffffBHHH",	"GPSTime,Fix,EPH,EPV,Lat,Lon,Alt,VelN,VelE,VelD,Cog,nSat,SNR,N,J"),
+	LOG_FORMAT(ATTC, "ffff",		"Roll,Pitch,Yaw,Thrust"),
+	LOG_FORMAT(STAT, "BBBfBB",		"MainState,ArmState,FailsafeState,BatRem,BatWarn,Landed"),
+	LOG_FORMAT(RC, "ffffffffBB",		"Ch0,Ch1,Ch2,Ch3,Ch4,Ch5,Ch6,Ch7,Count,SignalLost"),
+	LOG_FORMAT(OUT0, "ffffffff",		"Out0,Out1,Out2,Out3,Out4,Out5,Out6,Out7"),
+	LOG_FORMAT(AIRS, "fff",			"IndSpeed,TrueSpeed,AirTemp"),
+	LOG_FORMAT(ARSP, "fff",			"RollRateSP,PitchRateSP,YawRateSP"),
+	LOG_FORMAT(FLOW, "hhfffBB",		"RawX,RawY,CompX,CompY,Dist,Q,SensID"),
+	LOG_FORMAT(GPOS, "LLffffff",		"Lat,Lon,Alt,VelN,VelE,VelD,EPH,EPV"),
+	LOG_FORMAT(GPSP, "BLLffBfbf",		"NavState,Lat,Lon,Alt,Yaw,Type,LoitR,LoitDir,PitMin"),
+	LOG_FORMAT(ESC, "HBBBHHHHHHfH",		"count,nESC,Conn,N,Ver,Adr,Volt,Amp,RPM,Temp,SetP,SetPRAW"),
+	LOG_FORMAT(GVSP, "fff",			"VX,VY,VZ"),
+	LOG_FORMAT(BATT, "ffff",		"V,VFilt,C,Discharged"),
+	LOG_FORMAT(DIST, "ffB",			"Bottom,BottomRate,Flags"),
+	LOG_FORMAT(TELE, "BBBBHHB",		"RSSI,RemRSSI,Noise,RemNoise,RXErr,Fixed,TXBuf"),
+	LOG_FORMAT(EST0, "ffffffffffffBBBB",	"s0,s1,s2,s3,s4,s5,s6,s7,s8,s9,s10,s11,nStat,fNaN,fHealth,fTOut"),
+	LOG_FORMAT(EST1, "ffffffffffffffff",	"s12,s13,s14,s15,s16,s17,s18,s19,s20,s21,s22,s23,s24,s25,s26,s27"),
+	LOG_FORMAT(PWR, "fffBBBBB",		"Periph5V,Servo5V,RSSI,UsbOk,BrickOk,ServoOk,PeriphOC,HipwrOC"),
+	LOG_FORMAT(VICN, "ffffff",		"X,Y,Z,Roll,Pitch,Yaw"),
+	LOG_FORMAT(GS0A, "BBBBBBBBBBBBBBBB",	"s0,s1,s2,s3,s4,s5,s6,s7,s8,s9,s10,s11,s12,s13,s14,s15"),
+	LOG_FORMAT(GS0B, "BBBBBBBBBBBBBBBB",	"s0,s1,s2,s3,s4,s5,s6,s7,s8,s9,s10,s11,s12,s13,s14,s15"),
+	LOG_FORMAT(GS1A, "BBBBBBBBBBBBBBBB",	"s0,s1,s2,s3,s4,s5,s6,s7,s8,s9,s10,s11,s12,s13,s14,s15"),
+	LOG_FORMAT(GS1B, "BBBBBBBBBBBBBBBB",	"s0,s1,s2,s3,s4,s5,s6,s7,s8,s9,s10,s11,s12,s13,s14,s15"),
+	LOG_FORMAT(TECS, "ffffffffffffffB",	"AltSP,Alt,FSP,F,FF,AsSP,As,AsF,AsDSP,AsD,TERSP,TER,EDRSP,EDR,M"),
+	LOG_FORMAT(WIND, "ffff",	"X,Y,CovX,CovY"),
 
 	/* system-level messages, ID >= 0x80 */
-	// FMT: don't write format of format message, it's useless
+	/* FMT: don't write format of format message, it's useless */
 	LOG_FORMAT(TIME, "Q", "StartTime"),
 	LOG_FORMAT(VER, "NZ", "Arch,FwGit"),
-	LOG_FORMAT(PARM, "Nf", "Name,Value"),
-	LOG_FORMAT(ESTM, "ffffffffffffffffffffffffffffffffBBBB", "s0,s1,s2,s3,s4,s5,s6,s7,s8,s9,s10,s11,s12,s13,s14,s15,s16,s17,s18,s19,s20,s21,s22,s23,s24,s25,s26,s27,s28,s29,s30,s31,n_states,states_nan,cov_nan,kgain_nan"),
+	LOG_FORMAT(PARM, "Nf", "Name,Value")
 };
 
-static const int log_formats_num = sizeof(log_formats) / sizeof(struct log_format_s);
+static const unsigned log_formats_num = sizeof(log_formats) / sizeof(log_formats[0]);
 
 #endif /* SDLOG2_MESSAGES_H_ */
diff --git a/src/modules/segway/BlockSegwayController.cpp b/src/modules/segway/BlockSegwayController.cpp
index 96a443c6e..91230a37c 100644
--- a/src/modules/segway/BlockSegwayController.cpp
+++ b/src/modules/segway/BlockSegwayController.cpp
@@ -35,8 +35,8 @@ void BlockSegwayController::update() {
 
 	// handle autopilot modes
 	if (_status.main_state == MAIN_STATE_AUTO ||
-	    _status.main_state == MAIN_STATE_SEATBELT ||
-	    _status.main_state == MAIN_STATE_EASY) {
+	    _status.main_state == MAIN_STATE_ALTCTL ||
+	    _status.main_state == MAIN_STATE_POSCTL) {
 		_actuators.control[0] = spdCmd;
 		_actuators.control[1] = spdCmd;
 
diff --git a/src/modules/sensors/module.mk b/src/modules/sensors/module.mk
index aa538fd6b..5b1bc5e86 100644
--- a/src/modules/sensors/module.mk
+++ b/src/modules/sensors/module.mk
@@ -40,3 +40,5 @@ MODULE_PRIORITY	= "SCHED_PRIORITY_MAX-5"
 
 SRCS		= sensors.cpp \
 		  sensor_params.c
+
+MODULE_STACKSIZE = 1200
diff --git a/src/modules/sensors/sensor_params.c b/src/modules/sensors/sensor_params.c
index 288c6e00a..c8a3ec8f0 100644
--- a/src/modules/sensors/sensor_params.c
+++ b/src/modules/sensors/sensor_params.c
@@ -243,6 +243,36 @@ PARAM_DEFINE_INT32(SENS_DPRES_ANA, 0);
 PARAM_DEFINE_INT32(SENS_BOARD_ROT, 0);
 
 /**
+ * Board rotation Y (Pitch) offset
+ *
+ * This parameter defines a rotational offset in degrees around the Y (Pitch) axis. It allows the user
+ * to fine tune the board offset in the event of misalignment.
+ *
+ * @group Sensor Calibration
+ */
+ PARAM_DEFINE_FLOAT(SENS_BOARD_Y_OFF, 0.0f);
+
+/**
+ * Board rotation X (Roll) offset
+ *
+ * This parameter defines a rotational offset in degrees around the X (Roll) axis It allows the user
+ * to fine tune the board offset in the event of misalignment.
+ *
+ * @group Sensor Calibration
+ */
+PARAM_DEFINE_FLOAT(SENS_BOARD_X_OFF, 0.0f);
+
+/**
+ * Board rotation Z (YAW) offset
+ *
+ * This parameter defines a rotational offset in degrees around the Z (Yaw) axis. It allows the user
+ * to fine tune the board offset in the event of misalignment.
+ *
+ * @group Sensor Calibration
+ */
+PARAM_DEFINE_FLOAT(SENS_BOARD_Z_OFF, 0.0f);
+
+/**
  * External magnetometer rotation
  *
  * This parameter defines the rotation of the external magnetometer relative
@@ -488,6 +518,15 @@ PARAM_DEFINE_INT32(BAT_V_SCALE_IO, 10000);
  * @group Battery Calibration
  */
 PARAM_DEFINE_FLOAT(BAT_V_SCALING, 0.0082f);
+#elif CONFIG_ARCH_BOARD_AEROCORE
+/**
+ * Scaling factor for battery voltage sensor on AeroCore.
+ *
+ * For R70 = 133K, R71 = 10K --> scale = 1.8 * 143 / (4096*10) = 0.0063
+ *
+ * @group Battery Calibration
+ */
+PARAM_DEFINE_FLOAT(BAT_V_SCALING, 0.0063f);
 #else
 /**
  * Scaling factor for battery voltage sensor on FMU v1.
@@ -536,6 +575,20 @@ PARAM_DEFINE_INT32(RC_MAP_ROLL, 1);
 PARAM_DEFINE_INT32(RC_MAP_PITCH, 2);
 
 /**
+ * Failsafe channel mapping.
+ *
+ * The RC mapping index indicates which channel is used for failsafe
+ * If 0, whichever channel is mapped to throttle is used
+ * otherwise the value indicates the specific rc channel to use
+ *
+ * @min 0
+ * @max 18
+ *
+ *
+ */
+PARAM_DEFINE_INT32(RC_MAP_FAILSAFE, 0);  //Default to throttle function
+
+/**
  * Throttle control channel mapping.
  *
  * The channel index (starting from 1 for channel 1) indicates
@@ -585,24 +638,31 @@ PARAM_DEFINE_INT32(RC_MAP_MODE_SW, 0);
 PARAM_DEFINE_INT32(RC_MAP_RETURN_SW, 0);
 
 /**
- * Assist switch channel mapping.
+ * Posctl switch channel mapping.
  *
  * @min 0
  * @max 18
  * @group Radio Calibration
  */
-PARAM_DEFINE_INT32(RC_MAP_ASSIST_SW, 0);
+PARAM_DEFINE_INT32(RC_MAP_POSCTL_SW, 0);
 
 /**
- * Mission switch channel mapping.
+ * Loiter switch channel mapping.
  *
  * @min 0
  * @max 18
  * @group Radio Calibration
  */
-PARAM_DEFINE_INT32(RC_MAP_MISSIO_SW, 0);
+PARAM_DEFINE_INT32(RC_MAP_LOITER_SW, 0);
 
-//PARAM_DEFINE_INT32(RC_MAP_OFFB_SW, 0);
+/**
+ * Acro switch channel mapping.
+ *
+ * @min 0
+ * @max 18
+ * @group Radio Calibration
+ */
+PARAM_DEFINE_INT32(RC_MAP_ACRO_SW, 0);
 
 /**
  * Flaps channel mapping.
@@ -648,53 +708,106 @@ PARAM_DEFINE_INT32(RC_MAP_AUX3, 0);
 
 
 /**
- * Roll scaling factor
+ * Failsafe channel PWM threshold.
  *
+ * @min 800
+ * @max 2200
  * @group Radio Calibration
  */
-PARAM_DEFINE_FLOAT(RC_SCALE_ROLL, 0.6f);
+PARAM_DEFINE_INT32(RC_FAILS_THR, 0);
 
 /**
- * Pitch scaling factor
+ * Threshold for selecting assist mode
+ *
+ * min:-1
+ * max:+1
+ *
+ * 0-1 indicate where in the full channel range the threshold sits
+ * 		0 : min
+ * 		1 : max
+ * sign indicates polarity of comparison
+ * 		positive : true when channel>th
+ * 		negative : true when channel<th
  *
- * @group Radio Calibration
  */
-PARAM_DEFINE_FLOAT(RC_SCALE_PITCH, 0.6f);
+PARAM_DEFINE_FLOAT(RC_ASSIST_TH, 0.25f);
 
 /**
- * Yaw scaling factor
+ * Threshold for selecting auto mode
+ *
+ * min:-1
+ * max:+1
+ *
+ * 0-1 indicate where in the full channel range the threshold sits
+ * 		0 : min
+ * 		1 : max
+ * sign indicates polarity of comparison
+ * 		positive : true when channel>th
+ * 		negative : true when channel<th
  *
- * @group Radio Calibration
  */
-PARAM_DEFINE_FLOAT(RC_SCALE_YAW, 2.0f);
+PARAM_DEFINE_FLOAT(RC_AUTO_TH, 0.75f);
 
+/**
+ * Threshold for selecting posctl mode
+ *
+ * min:-1
+ * max:+1
+ *
+ * 0-1 indicate where in the full channel range the threshold sits
+ * 		0 : min
+ * 		1 : max
+ * sign indicates polarity of comparison
+ * 		positive : true when channel>th
+ * 		negative : true when channel<th
+ *
+ */
+PARAM_DEFINE_FLOAT(RC_POSCTL_TH, 0.5f);
 
 /**
- * Failsafe channel mapping.
+ * Threshold for selecting return to launch mode
+ *
+ * min:-1
+ * max:+1
+ *
+ * 0-1 indicate where in the full channel range the threshold sits
+ * 		0 : min
+ * 		1 : max
+ * sign indicates polarity of comparison
+ * 		positive : true when channel>th
+ * 		negative : true when channel<th
  *
- * @min 0
- * @max 18
- * @group Radio Calibration
  */
-PARAM_DEFINE_INT32(RC_FS_CH, 0);
+PARAM_DEFINE_FLOAT(RC_RETURN_TH, 0.5f);
 
 /**
- * Failsafe channel mode.
+ * Threshold for selecting loiter mode
  *
- * 0 = too low means signal loss,
- * 1 = too high means signal loss
+ * min:-1
+ * max:+1
+ *
+ * 0-1 indicate where in the full channel range the threshold sits
+ * 		0 : min
+ * 		1 : max
+ * sign indicates polarity of comparison
+ * 		positive : true when channel>th
+ * 		negative : true when channel<th
  *
- * @min 0
- * @max 1
- * @group Radio Calibration
  */
-PARAM_DEFINE_INT32(RC_FS_MODE, 0);
+PARAM_DEFINE_FLOAT(RC_LOITER_TH, 0.5f);
 
 /**
- * Failsafe channel PWM threshold.
+ * Threshold for selecting acro mode
+ *
+ * min:-1
+ * max:+1
+ *
+ * 0-1 indicate where in the full channel range the threshold sits
+ * 		0 : min
+ * 		1 : max
+ * sign indicates polarity of comparison
+ * 		positive : true when channel>th
+ * 		negative : true when channel<th
  *
- * @min 0
- * @max 1
- * @group Radio Calibration
  */
-PARAM_DEFINE_FLOAT(RC_FS_THR, 800);
+PARAM_DEFINE_FLOAT(RC_ACRO_TH, 0.5f);
diff --git a/src/modules/sensors/sensors.cpp b/src/modules/sensors/sensors.cpp
index f890c4c7f..3307354a0 100644
--- a/src/modules/sensors/sensors.cpp
+++ b/src/modules/sensors/sensors.cpp
@@ -126,6 +126,12 @@
 #define ADC_AIRSPEED_VOLTAGE_CHANNEL	15
 #endif
 
+#ifdef CONFIG_ARCH_BOARD_AEROCORE
+#define ADC_BATTERY_VOLTAGE_CHANNEL	10
+#define ADC_BATTERY_CURRENT_CHANNEL	-1
+#define ADC_AIRSPEED_VOLTAGE_CHANNEL	-1
+#endif
+
 #define BATT_V_LOWPASS 0.001f
 #define BATT_V_IGNORE_THRESHOLD 3.5f
 
@@ -135,7 +141,7 @@
  */
 #define PCB_TEMP_ESTIMATE_DEG 5.0f
 
-#define limit_minus_one_to_one(arg) (arg < -1.0f) ? -1.0f : ((arg > 1.0f) ? 1.0f : arg)
+#define STICK_ON_OFF_LIMIT 0.75f
 
 /**
  * Sensor app start / stop handling function
@@ -167,7 +173,16 @@ public:
 private:
 	static const unsigned _rc_max_chan_count = RC_INPUT_MAX_CHANNELS;	/**< maximum number of r/c channels we handle */
 
-	hrt_abstime	_rc_last_valid;		/**< last time we got a valid RC signal */
+	/**
+	 * Get and limit value for specified RC function. Returns NAN if not mapped.
+	 */
+	float		get_rc_value(enum RC_CHANNELS_FUNCTION func, float min_value, float max_value);
+
+	/**
+	 * Get switch position for specified function.
+	 */
+	switch_pos_t	get_rc_sw3pos_position(enum RC_CHANNELS_FUNCTION func, float on_th, bool on_inv, float mid_th, bool mid_inv);
+	switch_pos_t	get_rc_sw2pos_position(enum RC_CHANNELS_FUNCTION func, float on_th, bool on_inv);
 
 	/**
 	 * Gather and publish RC input data.
@@ -211,10 +226,10 @@ private:
 	struct differential_pressure_s _diff_pres;
 	struct airspeed_s _airspeed;
 
-	math::Matrix<3,3>	_board_rotation;		/**< rotation matrix for the orientation that the board is mounted */
-	math::Matrix<3,3>	_external_mag_rotation;		/**< rotation matrix for the orientation that an external mag is mounted */
+	math::Matrix<3, 3>	_board_rotation;		/**< rotation matrix for the orientation that the board is mounted */
+	math::Matrix<3, 3>	_external_mag_rotation;		/**< rotation matrix for the orientation that an external mag is mounted */
 	bool		_mag_is_external;		/**< true if the active mag is on an external board */
-
+	
 	uint64_t _battery_discharged;			/**< battery discharged current in mA*ms */
 	hrt_abstime _battery_current_timestamp;	/**< timestamp of last battery current reading */
 
@@ -237,18 +252,20 @@ private:
 
 		int board_rotation;
 		int external_mag_rotation;
+		
+		float board_offset[3];
 
 		int rc_map_roll;
 		int rc_map_pitch;
 		int rc_map_yaw;
 		int rc_map_throttle;
+		int rc_map_failsafe;
 
 		int rc_map_mode_sw;
 		int rc_map_return_sw;
-		int rc_map_assisted_sw;
-		int rc_map_mission_sw;
-
-//		int rc_map_offboard_ctrl_mode_sw;
+		int rc_map_posctl_sw;
+		int rc_map_loiter_sw;
+		int rc_map_acro_sw;
 
 		int rc_map_flaps;
 
@@ -258,14 +275,19 @@ private:
 		int rc_map_aux4;
 		int rc_map_aux5;
 
-		float rc_scale_roll;
-		float rc_scale_pitch;
-		float rc_scale_yaw;
-		float rc_scale_flaps;
-
-		int rc_fs_ch;
-		int rc_fs_mode;
-		float rc_fs_thr;
+		int32_t rc_fails_thr;
+		float rc_assist_th;
+		float rc_auto_th;
+		float rc_posctl_th;
+		float rc_return_th;
+		float rc_loiter_th;
+		float rc_acro_th;
+		bool rc_assist_inv;
+		bool rc_auto_inv;
+		bool rc_posctl_inv;
+		bool rc_return_inv;
+		bool rc_loiter_inv;
+		bool rc_acro_inv;
 
 		float battery_voltage_scaling;
 		float battery_current_scaling;
@@ -292,13 +314,13 @@ private:
 		param_t rc_map_pitch;
 		param_t rc_map_yaw;
 		param_t rc_map_throttle;
+		param_t rc_map_failsafe;
 
 		param_t rc_map_mode_sw;
 		param_t rc_map_return_sw;
-		param_t rc_map_assisted_sw;
-		param_t rc_map_mission_sw;
-
-//		param_t rc_map_offboard_ctrl_mode_sw;
+		param_t rc_map_posctl_sw;
+		param_t rc_map_loiter_sw;
+		param_t rc_map_acro_sw;
 
 		param_t rc_map_flaps;
 
@@ -308,20 +330,21 @@ private:
 		param_t rc_map_aux4;
 		param_t rc_map_aux5;
 
-		param_t rc_scale_roll;
-		param_t rc_scale_pitch;
-		param_t rc_scale_yaw;
-		param_t rc_scale_flaps;
-
-		param_t rc_fs_ch;
-		param_t rc_fs_mode;
-		param_t rc_fs_thr;
+		param_t rc_fails_thr;
+		param_t rc_assist_th;
+		param_t rc_auto_th;
+		param_t rc_posctl_th;
+		param_t rc_return_th;
+		param_t rc_loiter_th;
+		param_t rc_acro_th;
 
 		param_t battery_voltage_scaling;
 		param_t battery_current_scaling;
 
 		param_t board_rotation;
 		param_t external_mag_rotation;
+		
+		param_t board_offset[3];
 
 	}		_parameter_handles;		/**< handles for interesting parameters */
 
@@ -422,7 +445,7 @@ private:
 	/**
 	 * Main sensor collection task.
 	 */
-	void		task_main() __attribute__((noreturn));
+	void		task_main();
 };
 
 namespace sensors
@@ -438,8 +461,6 @@ Sensors	*g_sensors = nullptr;
 }
 
 Sensors::Sensors() :
-	_rc_last_valid(0),
-
 	_fd_adc(-1),
 	_last_adc(0),
 
@@ -474,6 +495,7 @@ Sensors::Sensors() :
 	_battery_discharged(0),
 	_battery_current_timestamp(0)
 {
+	memset(&_rc, 0, sizeof(_rc));
 
 	/* basic r/c parameters */
 	for (unsigned i = 0; i < _rc_max_chan_count; i++) {
@@ -506,6 +528,7 @@ Sensors::Sensors() :
 	_parameter_handles.rc_map_pitch = param_find("RC_MAP_PITCH");
 	_parameter_handles.rc_map_yaw 	= param_find("RC_MAP_YAW");
 	_parameter_handles.rc_map_throttle = param_find("RC_MAP_THROTTLE");
+	_parameter_handles.rc_map_failsafe = param_find("RC_MAP_FAILSAFE");
 
 	/* mandatory mode switches, mapped to channel 5 and 6 per default */
 	_parameter_handles.rc_map_mode_sw = param_find("RC_MAP_MODE_SW");
@@ -514,10 +537,9 @@ Sensors::Sensors() :
 	_parameter_handles.rc_map_flaps = param_find("RC_MAP_FLAPS");
 
 	/* optional mode switches, not mapped per default */
-	_parameter_handles.rc_map_assisted_sw = param_find("RC_MAP_ASSIST_SW");
-	_parameter_handles.rc_map_mission_sw = param_find("RC_MAP_MISSIO_SW");
-
-//	_parameter_handles.rc_map_offboard_ctrl_mode_sw = param_find("RC_MAP_OFFB_SW");
+	_parameter_handles.rc_map_posctl_sw = param_find("RC_MAP_POSCTL_SW");
+	_parameter_handles.rc_map_loiter_sw = param_find("RC_MAP_LOITER_SW");
+	_parameter_handles.rc_map_acro_sw = param_find("RC_MAP_ACRO_SW");
 
 	_parameter_handles.rc_map_aux1 = param_find("RC_MAP_AUX1");
 	_parameter_handles.rc_map_aux2 = param_find("RC_MAP_AUX2");
@@ -525,15 +547,14 @@ Sensors::Sensors() :
 	_parameter_handles.rc_map_aux4 = param_find("RC_MAP_AUX4");
 	_parameter_handles.rc_map_aux5 = param_find("RC_MAP_AUX5");
 
-	_parameter_handles.rc_scale_roll = param_find("RC_SCALE_ROLL");
-	_parameter_handles.rc_scale_pitch = param_find("RC_SCALE_PITCH");
-	_parameter_handles.rc_scale_yaw = param_find("RC_SCALE_YAW");
-	_parameter_handles.rc_scale_flaps = param_find("RC_SCALE_FLAPS");
-
-	/* RC failsafe */
-	_parameter_handles.rc_fs_ch = param_find("RC_FS_CH");
-	_parameter_handles.rc_fs_mode = param_find("RC_FS_MODE");
-	_parameter_handles.rc_fs_thr = param_find("RC_FS_THR");
+	/* RC thresholds */
+	_parameter_handles.rc_fails_thr = param_find("RC_FAILS_THR");
+	_parameter_handles.rc_assist_th = param_find("RC_ASSIST_TH");
+	_parameter_handles.rc_auto_th = param_find("RC_AUTO_TH");
+	_parameter_handles.rc_posctl_th = param_find("RC_POSCTL_TH");
+	_parameter_handles.rc_return_th = param_find("RC_RETURN_TH");
+	_parameter_handles.rc_loiter_th = param_find("RC_LOITER_TH");
+	_parameter_handles.rc_acro_th = param_find("RC_ACRO_TH");
 
 	/* gyro offsets */
 	_parameter_handles.gyro_offset[0] = param_find("SENS_GYRO_XOFF");
@@ -570,6 +591,11 @@ Sensors::Sensors() :
 	/* rotations */
 	_parameter_handles.board_rotation = param_find("SENS_BOARD_ROT");
 	_parameter_handles.external_mag_rotation = param_find("SENS_EXT_MAG_ROT");
+	
+	/* rotation offsets */
+	_parameter_handles.board_offset[0] = param_find("SENS_BOARD_X_OFF");
+	_parameter_handles.board_offset[1] = param_find("SENS_BOARD_Y_OFF");
+	_parameter_handles.board_offset[2] = param_find("SENS_BOARD_Z_OFF");
 
 	/* fetch initial parameter values */
 	parameters_update();
@@ -623,7 +649,7 @@ Sensors::parameters_update()
 		if (!isfinite(tmpScaleFactor) ||
 		    (tmpRevFactor < 0.000001f) ||
 		    (tmpRevFactor > 0.2f)) {
-			warnx("RC chan %u not sane, scaling: %8.6f, rev: %d", i, tmpScaleFactor, (int)(_parameters.rev[i]));
+			warnx("RC chan %u not sane, scaling: %8.6f, rev: %d", i, (double)tmpScaleFactor, (int)(_parameters.rev[i]));
 			/* scaling factors do not make sense, lock them down */
 			_parameters.scaling_factor[i] = 0.0f;
 			rc_valid = false;
@@ -634,64 +660,81 @@ Sensors::parameters_update()
 	}
 
 	/* handle wrong values */
-	if (!rc_valid)
+	if (!rc_valid) {
 		warnx("WARNING     WARNING     WARNING\n\nRC CALIBRATION NOT SANE!\n\n");
+	}
 
 	const char *paramerr = "FAIL PARM LOAD";
 
 	/* channel mapping */
 	if (param_get(_parameter_handles.rc_map_roll, &(_parameters.rc_map_roll)) != OK) {
-		warnx(paramerr);
+		warnx("%s", paramerr);
 	}
 
 	if (param_get(_parameter_handles.rc_map_pitch, &(_parameters.rc_map_pitch)) != OK) {
-		warnx(paramerr);
+		warnx("%s", paramerr);
 	}
 
 	if (param_get(_parameter_handles.rc_map_yaw, &(_parameters.rc_map_yaw)) != OK) {
-		warnx(paramerr);
+		warnx("%s", paramerr);
 	}
 
 	if (param_get(_parameter_handles.rc_map_throttle, &(_parameters.rc_map_throttle)) != OK) {
-		warnx(paramerr);
+		warnx("%s", paramerr);
+	}
+
+	if (param_get(_parameter_handles.rc_map_failsafe, &(_parameters.rc_map_failsafe)) != OK) {
+		warnx("%s", paramerr);
 	}
 
 	if (param_get(_parameter_handles.rc_map_mode_sw, &(_parameters.rc_map_mode_sw)) != OK) {
-		warnx(paramerr);
+		warnx("%s", paramerr);
 	}
 
 	if (param_get(_parameter_handles.rc_map_return_sw, &(_parameters.rc_map_return_sw)) != OK) {
-		warnx(paramerr);
+		warnx("%s", paramerr);
 	}
 
-	if (param_get(_parameter_handles.rc_map_assisted_sw, &(_parameters.rc_map_assisted_sw)) != OK) {
-		warnx(paramerr);
+	if (param_get(_parameter_handles.rc_map_posctl_sw, &(_parameters.rc_map_posctl_sw)) != OK) {
+		warnx("%s", paramerr);
 	}
 
-	if (param_get(_parameter_handles.rc_map_mission_sw, &(_parameters.rc_map_mission_sw)) != OK) {
-		warnx(paramerr);
+	if (param_get(_parameter_handles.rc_map_loiter_sw, &(_parameters.rc_map_loiter_sw)) != OK) {
+		warnx("%s", paramerr);
 	}
 
-	if (param_get(_parameter_handles.rc_map_flaps, &(_parameters.rc_map_flaps)) != OK) {
-		warnx(paramerr);
+	if (param_get(_parameter_handles.rc_map_acro_sw, &(_parameters.rc_map_acro_sw)) != OK) {
+		warnx("%s", paramerr);
 	}
 
-//	if (param_get(_parameter_handles.rc_map_offboard_ctrl_mode_sw, &(_parameters.rc_map_offboard_ctrl_mode_sw)) != OK) {
-//		warnx("Failed getting offboard control mode sw chan index");
-//	}
+	if (param_get(_parameter_handles.rc_map_flaps, &(_parameters.rc_map_flaps)) != OK) {
+		warnx("%s", paramerr);
+	}
 
 	param_get(_parameter_handles.rc_map_aux1, &(_parameters.rc_map_aux1));
 	param_get(_parameter_handles.rc_map_aux2, &(_parameters.rc_map_aux2));
 	param_get(_parameter_handles.rc_map_aux3, &(_parameters.rc_map_aux3));
 	param_get(_parameter_handles.rc_map_aux4, &(_parameters.rc_map_aux4));
 	param_get(_parameter_handles.rc_map_aux5, &(_parameters.rc_map_aux5));
-	param_get(_parameter_handles.rc_scale_roll, &(_parameters.rc_scale_roll));
-	param_get(_parameter_handles.rc_scale_pitch, &(_parameters.rc_scale_pitch));
-	param_get(_parameter_handles.rc_scale_yaw, &(_parameters.rc_scale_yaw));
-	param_get(_parameter_handles.rc_scale_flaps, &(_parameters.rc_scale_flaps));
-	param_get(_parameter_handles.rc_fs_ch, &(_parameters.rc_fs_ch));
-	param_get(_parameter_handles.rc_fs_mode, &(_parameters.rc_fs_mode));
-	param_get(_parameter_handles.rc_fs_thr, &(_parameters.rc_fs_thr));
+	param_get(_parameter_handles.rc_fails_thr, &(_parameters.rc_fails_thr));
+	param_get(_parameter_handles.rc_assist_th, &(_parameters.rc_assist_th));
+	_parameters.rc_assist_inv = (_parameters.rc_assist_th < 0);
+	_parameters.rc_assist_th = fabs(_parameters.rc_assist_th);
+	param_get(_parameter_handles.rc_auto_th, &(_parameters.rc_auto_th));
+	_parameters.rc_auto_inv = (_parameters.rc_auto_th < 0);
+	_parameters.rc_auto_th = fabs(_parameters.rc_auto_th);
+	param_get(_parameter_handles.rc_posctl_th, &(_parameters.rc_posctl_th));
+	_parameters.rc_posctl_inv = (_parameters.rc_posctl_th < 0);
+	_parameters.rc_posctl_th = fabs(_parameters.rc_posctl_th);
+	param_get(_parameter_handles.rc_return_th, &(_parameters.rc_return_th));
+	_parameters.rc_return_inv = (_parameters.rc_return_th < 0);
+	_parameters.rc_return_th = fabs(_parameters.rc_return_th);
+	param_get(_parameter_handles.rc_loiter_th, &(_parameters.rc_loiter_th));
+	_parameters.rc_loiter_inv = (_parameters.rc_loiter_th < 0);
+	_parameters.rc_loiter_th = fabs(_parameters.rc_loiter_th);
+	param_get(_parameter_handles.rc_acro_th, &(_parameters.rc_acro_th));
+	_parameters.rc_acro_inv = (_parameters.rc_acro_th < 0);
+	_parameters.rc_acro_th = fabs(_parameters.rc_acro_th);
 
 	/* update RC function mappings */
 	_rc.function[THROTTLE] = _parameters.rc_map_throttle - 1;
@@ -701,13 +744,12 @@ Sensors::parameters_update()
 
 	_rc.function[MODE] = _parameters.rc_map_mode_sw - 1;
 	_rc.function[RETURN] = _parameters.rc_map_return_sw - 1;
-	_rc.function[ASSISTED] = _parameters.rc_map_assisted_sw - 1;
-	_rc.function[MISSION] = _parameters.rc_map_mission_sw - 1;
+	_rc.function[POSCTL] = _parameters.rc_map_posctl_sw - 1;
+	_rc.function[LOITER] = _parameters.rc_map_loiter_sw - 1;
+	_rc.function[ACRO] = _parameters.rc_map_acro_sw - 1;
 
 	_rc.function[FLAPS] = _parameters.rc_map_flaps - 1;
 
-//	_rc.function[OFFBOARD_MODE] = _parameters.rc_map_offboard_ctrl_mode_sw - 1;
-
 	_rc.function[AUX_1] = _parameters.rc_map_aux1 - 1;
 	_rc.function[AUX_2] = _parameters.rc_map_aux2 - 1;
 	_rc.function[AUX_3] = _parameters.rc_map_aux3 - 1;
@@ -745,12 +787,12 @@ Sensors::parameters_update()
 
 	/* scaling of ADC ticks to battery voltage */
 	if (param_get(_parameter_handles.battery_voltage_scaling, &(_parameters.battery_voltage_scaling)) != OK) {
-		warnx(paramerr);
+		warnx("%s", paramerr);
 	}
 
 	/* scaling of ADC ticks to battery current */
 	if (param_get(_parameter_handles.battery_current_scaling, &(_parameters.battery_current_scaling)) != OK) {
-		warnx(paramerr);
+		warnx("%s", paramerr);
 	}
 
 	param_get(_parameter_handles.board_rotation, &(_parameters.board_rotation));
@@ -758,6 +800,18 @@ Sensors::parameters_update()
 
 	get_rot_matrix((enum Rotation)_parameters.board_rotation, &_board_rotation);
 	get_rot_matrix((enum Rotation)_parameters.external_mag_rotation, &_external_mag_rotation);
+	
+	param_get(_parameter_handles.board_offset[0], &(_parameters.board_offset[0]));
+	param_get(_parameter_handles.board_offset[1], &(_parameters.board_offset[1]));
+	param_get(_parameter_handles.board_offset[2], &(_parameters.board_offset[2]));
+	
+	/** fine tune board offset on parameter update **/
+	math::Matrix<3, 3> board_rotation_offset; 
+	board_rotation_offset.from_euler( M_DEG_TO_RAD_F * _parameters.board_offset[0],
+							 M_DEG_TO_RAD_F * _parameters.board_offset[1],
+							 M_DEG_TO_RAD_F * _parameters.board_offset[2]);
+	
+	_board_rotation = _board_rotation * board_rotation_offset;
 
 	return OK;
 }
@@ -785,7 +839,7 @@ Sensors::accel_init()
 		/* set the driver to poll at 1000Hz */
 		ioctl(fd, SENSORIOCSPOLLRATE, 1000);
 
-#elif CONFIG_ARCH_BOARD_PX4FMU_V2
+#elif CONFIG_ARCH_BOARD_PX4FMU_V2 || CONFIG_ARCH_BOARD_AEROCORE
 
 		/* set the accel internal sampling rate up to at leat 800Hz */
 		ioctl(fd, ACCELIOCSSAMPLERATE, 800);
@@ -794,7 +848,7 @@ Sensors::accel_init()
 		ioctl(fd, SENSORIOCSPOLLRATE, 800);
 
 #else
-#error Need a board configuration, either CONFIG_ARCH_BOARD_PX4FMU_V1 or CONFIG_ARCH_BOARD_PX4FMU_V2
+#error Need a board configuration, either CONFIG_ARCH_BOARD_PX4FMU_V1, CONFIG_ARCH_BOARD_PX4FMU_V2 or CONFIG_ARCH_BOARD_AEROCORE
 
 #endif
 
@@ -820,12 +874,14 @@ Sensors::gyro_init()
 #ifdef CONFIG_ARCH_BOARD_PX4FMU_V1
 
 		/* set the gyro internal sampling rate up to at least 1000Hz */
-		if (ioctl(fd, GYROIOCSSAMPLERATE, 1000) != OK)
+		if (ioctl(fd, GYROIOCSSAMPLERATE, 1000) != OK) {
 			ioctl(fd, GYROIOCSSAMPLERATE, 800);
+		}
 
 		/* set the driver to poll at 1000Hz */
-		if (ioctl(fd, SENSORIOCSPOLLRATE, 1000) != OK)
+		if (ioctl(fd, SENSORIOCSPOLLRATE, 1000) != OK) {
 			ioctl(fd, SENSORIOCSPOLLRATE, 800);
+		}
 
 #else
 
@@ -880,12 +936,15 @@ Sensors::mag_init()
 
 	ret = ioctl(fd, MAGIOCGEXTERNAL, 0);
 
-	if (ret < 0)
+	if (ret < 0) {
 		errx(1, "FATAL: unknown if magnetometer is external or onboard");
-	else if (ret == 1)
+
+	} else if (ret == 1) {
 		_mag_is_external = true;
-	else
+
+	} else {
 		_mag_is_external = false;
+	}
 
 	close(fd);
 }
@@ -985,10 +1044,12 @@ Sensors::mag_poll(struct sensor_combined_s &raw)
 
 		math::Vector<3> vect(mag_report.x, mag_report.y, mag_report.z);
 
-		if (_mag_is_external)
+		if (_mag_is_external) {
 			vect = _external_mag_rotation * vect;
-		else
+
+		} else {
 			vect = _board_rotation * vect;
+		}
 
 		raw.magnetometer_ga[0] = vect(0);
 		raw.magnetometer_ga[1] = vect(1);
@@ -1033,12 +1094,13 @@ Sensors::diff_pres_poll(struct sensor_combined_s &raw)
 		raw.differential_pressure_timestamp = _diff_pres.timestamp;
 		raw.differential_pressure_filtered_pa = _diff_pres.differential_pressure_filtered_pa;
 
-		float air_temperature_celcius = (_diff_pres.temperature > -300.0f) ? _diff_pres.temperature : (raw.baro_temp_celcius - PCB_TEMP_ESTIMATE_DEG);
+		float air_temperature_celsius = (_diff_pres.temperature > -300.0f) ? _diff_pres.temperature : (raw.baro_temp_celcius - PCB_TEMP_ESTIMATE_DEG);
 
 		_airspeed.timestamp = _diff_pres.timestamp;
 		_airspeed.indicated_airspeed_m_s = calc_indicated_airspeed(_diff_pres.differential_pressure_filtered_pa);
 		_airspeed.true_airspeed_m_s = calc_true_airspeed(_diff_pres.differential_pressure_filtered_pa + raw.baro_pres_mbar * 1e2f,
-					      raw.baro_pres_mbar * 1e2f, air_temperature_celcius);
+					      raw.baro_pres_mbar * 1e2f, air_temperature_celsius);
+		_airspeed.air_temperature_celsius = air_temperature_celsius;
 
 		/* announce the airspeed if needed, just publish else */
 		if (_airspeed_pub > 0) {
@@ -1105,8 +1167,9 @@ Sensors::parameter_update_poll(bool forced)
 			_parameters.gyro_scale[2],
 		};
 
-		if (OK != ioctl(fd, GYROIOCSSCALE, (long unsigned int)&gscale))
+		if (OK != ioctl(fd, GYROIOCSSCALE, (long unsigned int)&gscale)) {
 			warn("WARNING: failed to set scale / offsets for gyro");
+		}
 
 		close(fd);
 
@@ -1120,8 +1183,9 @@ Sensors::parameter_update_poll(bool forced)
 			_parameters.accel_scale[2],
 		};
 
-		if (OK != ioctl(fd, ACCELIOCSSCALE, (long unsigned int)&ascale))
+		if (OK != ioctl(fd, ACCELIOCSSCALE, (long unsigned int)&ascale)) {
 			warn("WARNING: failed to set scale / offsets for accel");
+		}
 
 		close(fd);
 
@@ -1135,8 +1199,9 @@ Sensors::parameter_update_poll(bool forced)
 			_parameters.mag_scale[2],
 		};
 
-		if (OK != ioctl(fd, MAGIOCSSCALE, (long unsigned int)&mscale))
+		if (OK != ioctl(fd, MAGIOCSSCALE, (long unsigned int)&mscale)) {
 			warn("WARNING: failed to set scale / offsets for mag");
+		}
 
 		close(fd);
 
@@ -1150,15 +1215,17 @@ Sensors::parameter_update_poll(bool forced)
 				1.0f,
 			};
 
-			if (OK != ioctl(fd, AIRSPEEDIOCSSCALE, (long unsigned int)&airscale))
+			if (OK != ioctl(fd, AIRSPEEDIOCSSCALE, (long unsigned int)&airscale)) {
 				warn("WARNING: failed to set scale / offsets for airspeed sensor");
+			}
+
 			close(fd);
 		}
 
 #if 0
-		printf("CH0: RAW MAX: %d MIN %d S: %d MID: %d FUNC: %d\n", (int)_parameters.max[0], (int)_parameters.min[0], (int)(_rc.chan[0].scaling_factor * 10000), (int)(_rc.chan[0].mid), (int)_rc.function[0]);
-		printf("CH1: RAW MAX: %d MIN %d S: %d MID: %d FUNC: %d\n", (int)_parameters.max[1], (int)_parameters.min[1], (int)(_rc.chan[1].scaling_factor * 10000), (int)(_rc.chan[1].mid), (int)_rc.function[1]);
-		printf("MAN: %d %d\n", (int)(_rc.chan[0].scaled * 100), (int)(_rc.chan[1].scaled * 100));
+		printf("CH0: RAW MAX: %d MIN %d S: %d MID: %d FUNC: %d\n", (int)_parameters.max[0], (int)_parameters.min[0], (int)(_rc.channels[0].scaling_factor * 10000), (int)(_rc.channels[0].mid), (int)_rc.function[0]);
+		printf("CH1: RAW MAX: %d MIN %d S: %d MID: %d FUNC: %d\n", (int)_parameters.max[1], (int)_parameters.min[1], (int)(_rc.channels[1].scaling_factor * 10000), (int)(_rc.channels[1].mid), (int)_rc.function[1]);
+		printf("MAN: %d %d\n", (int)(_rc.channels[0] * 100), (int)(_rc.channels[1] * 100));
 		fflush(stdout);
 		usleep(5000);
 #endif
@@ -1169,10 +1236,12 @@ void
 Sensors::adc_poll(struct sensor_combined_s &raw)
 {
 	/* only read if publishing */
-	if (!_publishing)
+	if (!_publishing) {
 		return;
+	}
 
 	hrt_abstime t = hrt_absolute_time();
+
 	/* rate limit to 100 Hz */
 	if (t - _last_adc >= 10000) {
 		/* make space for a maximum of twelve channels (to ensure reading all channels at once) */
@@ -1197,6 +1266,7 @@ Sensors::adc_poll(struct sensor_combined_s &raw)
 
 					if (voltage > BATT_V_IGNORE_THRESHOLD) {
 						_battery_status.voltage_v = voltage;
+
 						/* one-time initialization of low-pass value to avoid long init delays */
 						if (_battery_status.voltage_filtered_v < BATT_V_IGNORE_THRESHOLD) {
 							_battery_status.voltage_filtered_v = voltage;
@@ -1215,19 +1285,24 @@ Sensors::adc_poll(struct sensor_combined_s &raw)
 					/* handle current only if voltage is valid */
 					if (_battery_status.voltage_v > 0.0f) {
 						float current = (buf_adc[i].am_data * _parameters.battery_current_scaling);
+
 						/* check measured current value */
 						if (current >= 0.0f) {
 							_battery_status.timestamp = t;
 							_battery_status.current_a = current;
+
 							if (_battery_current_timestamp != 0) {
 								/* initialize discharged value */
-								if (_battery_status.discharged_mah < 0.0f)
+								if (_battery_status.discharged_mah < 0.0f) {
 									_battery_status.discharged_mah = 0.0f;
+								}
+
 								_battery_discharged += current * (t - _battery_current_timestamp);
 								_battery_status.discharged_mah = ((float) _battery_discharged) / 3600000.0f;
 							}
 						}
 					}
+
 					_battery_current_timestamp = t;
 
 				} else if (ADC_AIRSPEED_VOLTAGE_CHANNEL == buf_adc[i].am_channel) {
@@ -1240,7 +1315,7 @@ Sensors::adc_poll(struct sensor_combined_s &raw)
 					 * a valid voltage from a connected sensor. Also assume a non-
 					 * zero offset from the sensor if its connected.
 					 */
-					if (voltage > 0.4f && _parameters.diff_pres_analog_enabled) {
+					if (voltage > 0.4f && (_parameters.diff_pres_analog_enabled > 0)) {
 
 						float diff_pres_pa = voltage * 1000.0f - _parameters.diff_pres_offset_pa; //for MPXV7002DP sensor
 
@@ -1260,8 +1335,10 @@ Sensors::adc_poll(struct sensor_combined_s &raw)
 					}
 				}
 			}
+
 			_last_adc = t;
-			if (_battery_status.voltage_v > 0.0f) {
+
+			if (_battery_status.voltage_filtered_v > BATT_V_IGNORE_THRESHOLD) {
 				/* announce the battery status if needed, just publish else */
 				if (_battery_pub > 0) {
 					orb_publish(ORB_ID(battery_status), _battery_pub, &_battery_status);
@@ -1274,6 +1351,66 @@ Sensors::adc_poll(struct sensor_combined_s &raw)
 	}
 }
 
+float
+Sensors::get_rc_value(enum RC_CHANNELS_FUNCTION func, float min_value, float max_value)
+{
+	if (_rc.function[func] >= 0) {
+		float value = _rc.channels[_rc.function[func]];
+
+		if (value < min_value) {
+			return min_value;
+
+		} else if (value > max_value) {
+			return max_value;
+
+		} else {
+			return value;
+		}
+
+	} else {
+		return 0.0f;
+	}
+}
+
+switch_pos_t
+Sensors::get_rc_sw3pos_position(enum RC_CHANNELS_FUNCTION func, float on_th, bool on_inv, float mid_th, bool mid_inv)
+{
+	if (_rc.function[func] >= 0) {
+		float value = 0.5f * _rc.channels[_rc.function[func]] + 0.5f;
+
+		if (on_inv ? value < on_th : value > on_th) {
+			return SWITCH_POS_ON;
+
+		} else if (mid_inv ? value < mid_th : value > mid_th) {
+			return SWITCH_POS_MIDDLE;
+
+		} else {
+			return SWITCH_POS_OFF;
+		}
+
+	} else {
+		return SWITCH_POS_NONE;
+	}
+}
+
+switch_pos_t
+Sensors::get_rc_sw2pos_position(enum RC_CHANNELS_FUNCTION func, float on_th, bool on_inv)
+{
+	if (_rc.function[func] >= 0) {
+		float value = 0.5f * _rc.channels[_rc.function[func]] + 0.5f;
+
+		if (on_inv ? value < on_th : value > on_th) {
+			return SWITCH_POS_ON;
+
+		} else {
+			return SWITCH_POS_OFF;
+		}
+
+	} else {
+		return SWITCH_POS_NONE;
+	}
+}
+
 void
 Sensors::rc_poll()
 {
@@ -1282,70 +1419,58 @@ Sensors::rc_poll()
 
 	if (rc_updated) {
 		/* read low-level values from FMU or IO RC inputs (PPM, Spektrum, S.Bus) */
-		struct rc_input_values	rc_input;
+		struct rc_input_values rc_input;
 
 		orb_copy(ORB_ID(input_rc), _rc_sub, &rc_input);
 
-		if (rc_input.rc_lost)
-			return;
-
-		struct manual_control_setpoint_s manual_control;
-		struct actuator_controls_s actuator_group_3;
-
-		/* initialize to default values */
-		manual_control.roll = NAN;
-		manual_control.pitch = NAN;
-		manual_control.yaw = NAN;
-		manual_control.throttle = NAN;
-
-		manual_control.mode_switch = NAN;
-		manual_control.return_switch = NAN;
-		manual_control.assisted_switch = NAN;
-		manual_control.mission_switch = NAN;
-//		manual_control.auto_offboard_input_switch = NAN;
-
-		manual_control.flaps = NAN;
-		manual_control.aux1 = NAN;
-		manual_control.aux2 = NAN;
-		manual_control.aux3 = NAN;
-		manual_control.aux4 = NAN;
-		manual_control.aux5 = NAN;
-
-		/* require at least four channels to consider the signal valid */
-		if (rc_input.channel_count < 4)
-			return;
-
-		/* failsafe check */
-		if (_parameters.rc_fs_ch != 0) {
-			if (_parameters.rc_fs_mode == 0) {
-				if (rc_input.values[_parameters.rc_fs_ch - 1] < _parameters.rc_fs_thr)
-					return;
-
-			} else if (_parameters.rc_fs_mode == 1) {
-				if (rc_input.values[_parameters.rc_fs_ch - 1] > _parameters.rc_fs_thr)
-					return;
+		/* detect RC signal loss */
+		bool signal_lost;
+
+		/* check flags and require at least four channels to consider the signal valid */
+		if (rc_input.rc_lost || rc_input.rc_failsafe || rc_input.channel_count < 4) {
+			/* signal is lost or no enough channels */
+			signal_lost = true;
+
+		} else {
+			/* signal looks good */
+			signal_lost = false;
+
+			/* check failsafe */
+			int8_t fs_ch = _rc.function[_parameters.rc_map_failsafe]; // get channel mapped to throttle
+
+			if (_parameters.rc_map_failsafe > 0) { // if not 0, use channel number instead of rc.function mapping
+				fs_ch = _parameters.rc_map_failsafe - 1;
+			}
+
+			if (_parameters.rc_fails_thr > 0 && fs_ch >= 0) {
+				/* failsafe configured */
+				if ((_parameters.rc_fails_thr < _parameters.min[fs_ch] && rc_input.values[fs_ch] < _parameters.rc_fails_thr) ||
+				    (_parameters.rc_fails_thr > _parameters.max[fs_ch] && rc_input.values[fs_ch] > _parameters.rc_fails_thr)) {
+					/* failsafe triggered, signal is lost by receiver */
+					signal_lost = true;
+				}
 			}
 		}
 
 		unsigned channel_limit = rc_input.channel_count;
 
-		if (channel_limit > _rc_max_chan_count)
+		if (channel_limit > _rc_max_chan_count) {
 			channel_limit = _rc_max_chan_count;
+		}
 
-		/* we are accepting this message */
-		_rc_last_valid = rc_input.timestamp_last_signal;
-
-		/* Read out values from raw message */
+		/* read out and scale values from raw message even if signal is invalid */
 		for (unsigned int i = 0; i < channel_limit; i++) {
 
 			/*
 			 * 1) Constrain to min/max values, as later processing depends on bounds.
 			 */
-			if (rc_input.values[i] < _parameters.min[i])
+			if (rc_input.values[i] < _parameters.min[i]) {
 				rc_input.values[i] = _parameters.min[i];
+			}
 
-			if (rc_input.values[i] > _parameters.max[i])
+			if (rc_input.values[i] > _parameters.max[i]) {
 				rc_input.values[i] = _parameters.max[i];
+			}
 
 			/*
 			 * 2) Scale around the mid point differently for lower and upper range.
@@ -1364,148 +1489,95 @@ Sensors::rc_poll()
 			 * DO NOT REMOVE OR ALTER STEP 1!
 			 */
 			if (rc_input.values[i] > (_parameters.trim[i] + _parameters.dz[i])) {
-				_rc.chan[i].scaled = (rc_input.values[i] - _parameters.trim[i] - _parameters.dz[i]) / (float)(_parameters.max[i] - _parameters.trim[i] - _parameters.dz[i]);
+				_rc.channels[i] = (rc_input.values[i] - _parameters.trim[i] - _parameters.dz[i]) / (float)(_parameters.max[i] - _parameters.trim[i] - _parameters.dz[i]);
 
 			} else if (rc_input.values[i] < (_parameters.trim[i] - _parameters.dz[i])) {
-				_rc.chan[i].scaled = (rc_input.values[i] - _parameters.trim[i] + _parameters.dz[i]) / (float)(_parameters.trim[i] - _parameters.min[i] - _parameters.dz[i]);
+				_rc.channels[i] = (rc_input.values[i] - _parameters.trim[i] + _parameters.dz[i]) / (float)(_parameters.trim[i] - _parameters.min[i] - _parameters.dz[i]);
 
 			} else {
 				/* in the configured dead zone, output zero */
-				_rc.chan[i].scaled = 0.0f;
+				_rc.channels[i] = 0.0f;
 			}
 
-			_rc.chan[i].scaled *= _parameters.rev[i];
+			_rc.channels[i] *= _parameters.rev[i];
 
 			/* handle any parameter-induced blowups */
-			if (!isfinite(_rc.chan[i].scaled))
-				_rc.chan[i].scaled = 0.0f;
-		}
-
-		_rc.chan_count = rc_input.channel_count;
-		_rc.timestamp = rc_input.timestamp_last_signal;
-
-		manual_control.timestamp = rc_input.timestamp_last_signal;
-
-		/* roll input - rolling right is stick-wise and rotation-wise positive */
-		manual_control.roll = limit_minus_one_to_one(_rc.chan[_rc.function[ROLL]].scaled);
-		/*
-		 * pitch input - stick down is negative, but stick down is pitching up (pos) in NED,
-		 * so reverse sign.
-		 */
-		manual_control.pitch = limit_minus_one_to_one(-1.0f * _rc.chan[_rc.function[PITCH]].scaled);
-		/* yaw input - stick right is positive and positive rotation */
-		manual_control.yaw = limit_minus_one_to_one(_rc.chan[_rc.function[YAW]].scaled);
-		/* throttle input */
-		manual_control.throttle = _rc.chan[_rc.function[THROTTLE]].scaled;
-
-		if (manual_control.throttle < 0.0f) manual_control.throttle = 0.0f;
-
-		if (manual_control.throttle > 1.0f) manual_control.throttle = 1.0f;
-
-		/* scale output */
-		if (isfinite(_parameters.rc_scale_roll) && _parameters.rc_scale_roll > 0.0f) {
-			manual_control.roll *= _parameters.rc_scale_roll;
-		}
-
-		if (isfinite(_parameters.rc_scale_pitch) && _parameters.rc_scale_pitch > 0.0f) {
-			manual_control.pitch *= _parameters.rc_scale_pitch;
-		}
-
-		if (isfinite(_parameters.rc_scale_yaw) && _parameters.rc_scale_yaw > 0.0f) {
-			manual_control.yaw *= _parameters.rc_scale_yaw;
-		}
-
-		/* flaps */
-		if (_rc.function[FLAPS] >= 0) {
-
-			manual_control.flaps = limit_minus_one_to_one(_rc.chan[_rc.function[FLAPS]].scaled);
-
-			if (isfinite(_parameters.rc_scale_flaps) && _parameters.rc_scale_flaps > 0.0f) {
-				manual_control.flaps *= _parameters.rc_scale_flaps;
+			if (!isfinite(_rc.channels[i])) {
+				_rc.channels[i] = 0.0f;
 			}
 		}
 
-		/* mode switch input */
-		if (_rc.function[MODE] >= 0) {
-			manual_control.mode_switch = limit_minus_one_to_one(_rc.chan[_rc.function[MODE]].scaled);
-		}
-
-		/* assisted switch input */
-		if (_rc.function[ASSISTED] >= 0) {
-			manual_control.assisted_switch = limit_minus_one_to_one(_rc.chan[_rc.function[ASSISTED]].scaled);
-		}
-
-		/* mission switch input */
-		if (_rc.function[MISSION] >= 0) {
-			manual_control.mission_switch = limit_minus_one_to_one(_rc.chan[_rc.function[MISSION]].scaled);
-		}
-
-		/* return switch input */
-		if (_rc.function[RETURN] >= 0) {
-			manual_control.return_switch = limit_minus_one_to_one(_rc.chan[_rc.function[RETURN]].scaled);
-		}
-
-//		if (_rc.function[OFFBOARD_MODE] >= 0) {
-//			manual_control.auto_offboard_input_switch = limit_minus_one_to_one(_rc.chan[_rc.function[OFFBOARD_MODE]].scaled);
-//		}
-
-		/* aux functions, only assign if valid mapping is present */
-		if (_rc.function[AUX_1] >= 0) {
-			manual_control.aux1 = limit_minus_one_to_one(_rc.chan[_rc.function[AUX_1]].scaled);
-		}
-
-		if (_rc.function[AUX_2] >= 0) {
-			manual_control.aux2 = limit_minus_one_to_one(_rc.chan[_rc.function[AUX_2]].scaled);
-		}
-
-		if (_rc.function[AUX_3] >= 0) {
-			manual_control.aux3 = limit_minus_one_to_one(_rc.chan[_rc.function[AUX_3]].scaled);
-		}
-
-		if (_rc.function[AUX_4] >= 0) {
-			manual_control.aux4 = limit_minus_one_to_one(_rc.chan[_rc.function[AUX_4]].scaled);
-		}
-
-		if (_rc.function[AUX_5] >= 0) {
-			manual_control.aux5 = limit_minus_one_to_one(_rc.chan[_rc.function[AUX_5]].scaled);
-		}
+		_rc.channel_count = rc_input.channel_count;
+		_rc.rssi = rc_input.rssi;
+		_rc.signal_lost = signal_lost;
+		_rc.timestamp = rc_input.timestamp_last_signal;
 
-		/* copy from mapped manual control to control group 3 */
-		actuator_group_3.control[0] = manual_control.roll;
-		actuator_group_3.control[1] = manual_control.pitch;
-		actuator_group_3.control[2] = manual_control.yaw;
-		actuator_group_3.control[3] = manual_control.throttle;
-		actuator_group_3.control[4] = manual_control.flaps;
-		actuator_group_3.control[5] = manual_control.aux1;
-		actuator_group_3.control[6] = manual_control.aux2;
-		actuator_group_3.control[7] = manual_control.aux3;
-
-		/* check if ready for publishing */
+		/* publish rc_channels topic even if signal is invalid, for debug */
 		if (_rc_pub > 0) {
 			orb_publish(ORB_ID(rc_channels), _rc_pub, &_rc);
 
 		} else {
-			/* advertise the rc topic */
 			_rc_pub = orb_advertise(ORB_ID(rc_channels), &_rc);
 		}
 
-		/* check if ready for publishing */
-		if (_manual_control_pub > 0) {
-			orb_publish(ORB_ID(manual_control_setpoint), _manual_control_pub, &manual_control);
+		if (!signal_lost) {
+			struct manual_control_setpoint_s manual;
+			memset(&manual, 0 , sizeof(manual));
+
+			/* fill values in manual_control_setpoint topic only if signal is valid */
+			manual.timestamp = rc_input.timestamp_last_signal;
+
+			/* limit controls */
+			manual.y = get_rc_value(ROLL, -1.0, 1.0);
+			manual.x = get_rc_value(PITCH, -1.0, 1.0);
+			manual.r = get_rc_value(YAW, -1.0, 1.0);
+			manual.z = get_rc_value(THROTTLE, 0.0, 1.0);
+			manual.flaps = get_rc_value(FLAPS, -1.0, 1.0);
+			manual.aux1 = get_rc_value(AUX_1, -1.0, 1.0);
+			manual.aux2 = get_rc_value(AUX_2, -1.0, 1.0);
+			manual.aux3 = get_rc_value(AUX_3, -1.0, 1.0);
+			manual.aux4 = get_rc_value(AUX_4, -1.0, 1.0);
+			manual.aux5 = get_rc_value(AUX_5, -1.0, 1.0);
+
+			/* mode switches */
+			manual.mode_switch = get_rc_sw3pos_position(MODE, _parameters.rc_auto_th, _parameters.rc_auto_inv, _parameters.rc_assist_th, _parameters.rc_assist_inv);
+			manual.posctl_switch = get_rc_sw2pos_position(POSCTL, _parameters.rc_posctl_th, _parameters.rc_posctl_inv);
+			manual.return_switch = get_rc_sw2pos_position(RETURN, _parameters.rc_return_th, _parameters.rc_return_inv);
+			manual.loiter_switch = get_rc_sw2pos_position(LOITER, _parameters.rc_loiter_th, _parameters.rc_loiter_inv);
+			manual.acro_switch = get_rc_sw2pos_position(ACRO, _parameters.rc_acro_th, _parameters.rc_acro_inv);
+
+			/* publish manual_control_setpoint topic */
+			if (_manual_control_pub > 0) {
+				orb_publish(ORB_ID(manual_control_setpoint), _manual_control_pub, &manual);
 
-		} else {
-			_manual_control_pub = orb_advertise(ORB_ID(manual_control_setpoint), &manual_control);
-		}
+			} else {
+				_manual_control_pub = orb_advertise(ORB_ID(manual_control_setpoint), &manual);
+			}
 
-		/* check if ready for publishing */
-		if (_actuator_group_3_pub > 0) {
-			orb_publish(ORB_ID(actuator_controls_3), _actuator_group_3_pub, &actuator_group_3);
+			/* copy from mapped manual control to control group 3 */
+			struct actuator_controls_s actuator_group_3;
+			memset(&actuator_group_3, 0 , sizeof(actuator_group_3));
 
-		} else {
-			_actuator_group_3_pub = orb_advertise(ORB_ID(actuator_controls_3), &actuator_group_3);
+			actuator_group_3.timestamp = rc_input.timestamp_last_signal;
+
+			actuator_group_3.control[0] = manual.y;
+			actuator_group_3.control[1] = manual.x;
+			actuator_group_3.control[2] = manual.r;
+			actuator_group_3.control[3] = manual.z;
+			actuator_group_3.control[4] = manual.flaps;
+			actuator_group_3.control[5] = manual.aux1;
+			actuator_group_3.control[6] = manual.aux2;
+			actuator_group_3.control[7] = manual.aux3;
+
+			/* publish actuator_controls_3 topic */
+			if (_actuator_group_3_pub > 0) {
+				orb_publish(ORB_ID(actuator_controls_3), _actuator_group_3_pub, &actuator_group_3);
+
+			} else {
+				_actuator_group_3_pub = orb_advertise(ORB_ID(actuator_controls_3), &actuator_group_3);
+			}
 		}
 	}
-
 }
 
 void
@@ -1582,12 +1654,10 @@ Sensors::task_main()
 
 	while (!_task_should_exit) {
 
-		/* wait for up to 100ms for data */
-		int pret = poll(&fds[0], (sizeof(fds) / sizeof(fds[0])), 100);
+		/* wait for up to 50ms for data */
+		int pret = poll(&fds[0], (sizeof(fds) / sizeof(fds[0])), 50);
 
-		/* timed out - periodic check for _task_should_exit, etc. */
-		if (pret == 0)
-			continue;
+		/* if pret == 0 it timed out - periodic check for _task_should_exit, etc. */
 
 		/* this is undesirable but not much we can do - might want to flag unhappy status */
 		if (pret < 0) {
@@ -1617,8 +1687,9 @@ Sensors::task_main()
 		diff_pres_poll(raw);
 
 		/* Inform other processes that new data is available to copy */
-		if (_publishing)
+		if (_publishing) {
 			orb_publish(ORB_ID(sensor_combined), _sensor_pub, &raw);
+		}
 
 		/* Look for new r/c input data */
 		rc_poll();
@@ -1626,7 +1697,7 @@ Sensors::task_main()
 		perf_end(_loop_perf);
 	}
 
-	printf("[sensors] exiting.\n");
+	warnx("[sensors] exiting.");
 
 	_sensors_task = -1;
 	_exit(0);
@@ -1641,7 +1712,7 @@ Sensors::start()
 	_sensors_task = task_spawn_cmd("sensors_task",
 				       SCHED_DEFAULT,
 				       SCHED_PRIORITY_MAX - 5,
-				       2048,
+				       2000,
 				       (main_t)&Sensors::task_main_trampoline,
 				       nullptr);
 
@@ -1655,18 +1726,21 @@ Sensors::start()
 
 int sensors_main(int argc, char *argv[])
 {
-	if (argc < 1)
+	if (argc < 1) {
 		errx(1, "usage: sensors {start|stop|status}");
+	}
 
 	if (!strcmp(argv[1], "start")) {
 
-		if (sensors::g_sensors != nullptr)
+		if (sensors::g_sensors != nullptr) {
 			errx(0, "already running");
+		}
 
 		sensors::g_sensors = new Sensors;
 
-		if (sensors::g_sensors == nullptr)
+		if (sensors::g_sensors == nullptr) {
 			errx(1, "alloc failed");
+		}
 
 		if (OK != sensors::g_sensors->start()) {
 			delete sensors::g_sensors;
@@ -1678,8 +1752,9 @@ int sensors_main(int argc, char *argv[])
 	}
 
 	if (!strcmp(argv[1], "stop")) {
-		if (sensors::g_sensors == nullptr)
+		if (sensors::g_sensors == nullptr) {
 			errx(1, "not running");
+		}
 
 		delete sensors::g_sensors;
 		sensors::g_sensors = nullptr;
@@ -1698,4 +1773,3 @@ int sensors_main(int argc, char *argv[])
 	warnx("unrecognized command");
 	return 1;
 }
-
diff --git a/src/modules/fw_att_pos_estimator/fw_att_pos_estimator_params.c b/src/modules/systemlib/circuit_breaker.c
index 6138ef39c..b59531d69 100644
--- a/src/modules/fw_att_pos_estimator/fw_att_pos_estimator_params.c
+++ b/src/modules/systemlib/circuit_breaker.c
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -31,87 +31,63 @@
  *
  ****************************************************************************/
 
-/**
- * @file fw_att_pos_estimator_params.c
- *
- * Parameters defined by the attitude and position estimator task
- *
- * @author Lorenz Meier <lm@inf.ethz.ch>
- */
-
-#include <nuttx/config.h>
-
-#include <systemlib/param/param.h>
-
 /*
- * Estimator parameters, accessible via MAVLink
- *
+ * @file circuit_breaker.c
+ *
+ * Circuit breaker parameters.
+ * Analog to real aviation circuit breakers these parameters
+ * allow to disable subsystems. They are not supported as standard
+ * operation procedure and are only provided for development purposes.
+ * To ensure they are not activated accidentally, the associated
+ * parameter needs to set to the key (magic).
  */
 
-/**
- * Velocity estimate delay
- *
- * The delay in milliseconds of the velocity estimate from GPS.
- *
- * @min 0
- * @max 1000
- * @group Position Estimator
- */
-PARAM_DEFINE_INT32(PE_VEL_DELAY_MS, 230);
+#include <systemlib/param/param.h>
+#include <systemlib/circuit_breaker.h>
 
 /**
- * Position estimate delay
+ * Circuit breaker for power supply check
  *
- * The delay in milliseconds of the position estimate from GPS.
+ * Setting this parameter to 894281 will disable the power valid
+ * checks in the commander.
+ * WARNING: ENABLING THIS CIRCUIT BREAKER IS AT OWN RISK
  *
  * @min 0
- * @max 1000
- * @group Position Estimator
+ * @max 894281
+ * @group Circuit Breaker
  */
-PARAM_DEFINE_INT32(PE_POS_DELAY_MS, 210);
+PARAM_DEFINE_INT32(CBRK_SUPPLY_CHK, 0);
 
 /**
- * Height estimate delay
+ * Circuit breaker for rate controller output
  *
- * The delay in milliseconds of the height estimate from the barometer.
+ * Setting this parameter to 140253 will disable the rate
+ * controller uORB publication.
+ * WARNING: ENABLING THIS CIRCUIT BREAKER IS AT OWN RISK
  *
  * @min 0
- * @max 1000
- * @group Position Estimator
+ * @max 140253
+ * @group Circuit Breaker
  */
-PARAM_DEFINE_INT32(PE_HGT_DELAY_MS, 350);
+PARAM_DEFINE_INT32(CBRK_RATE_CTRL, 0);
 
 /**
- * Mag estimate delay
+ * Circuit breaker for IO safety
  *
- * The delay in milliseconds of the magnetic field estimate from
- * the magnetometer.
+ * Setting this parameter to 894281 will disable IO safety.
+ * WARNING: ENABLING THIS CIRCUIT BREAKER IS AT OWN RISK
  *
  * @min 0
- * @max 1000
- * @group Position Estimator
+ * @max 22027
+ * @group Circuit Breaker
  */
-PARAM_DEFINE_INT32(PE_MAG_DELAY_MS, 30);
+PARAM_DEFINE_INT32(CBRK_IO_SAFETY, 0);
 
-/**
- * True airspeeed estimate delay
- *
- * The delay in milliseconds of the airspeed estimate.
- *
- * @min 0
- * @max 1000
- * @group Position Estimator
- */
-PARAM_DEFINE_INT32(PE_TAS_DELAY_MS, 210);
+bool circuit_breaker_enabled(const char* breaker, int32_t magic)
+{
+	int32_t val;
+	(void)param_get(param_find(breaker), val);
 
-/**
- * GPS vs. barometric altitude update weight
- *
- * RE-CHECK this.
- *
- * @min 0.0
- * @max 1.0
- * @group Position Estimator
- */
-PARAM_DEFINE_FLOAT(PE_GPS_ALT_WGT, 0.9f);
+	return (val == magic);
+}
 
diff --git a/src/modules/fixedwing_att_control/fixedwing_att_control_rate.h b/src/modules/systemlib/circuit_breaker.h
index 500e3e197..86439e2a5 100644
--- a/src/modules/fixedwing_att_control/fixedwing_att_control_rate.h
+++ b/src/modules/systemlib/circuit_breaker.h
@@ -1,8 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: @author Thomas Gubler <thomasgubler@student.ethz.ch>
- *
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -33,16 +31,25 @@
  *
  ****************************************************************************/
 
-/* @file Fixed Wing Attitude Rate Control */
+/*
+ * @file circuit_breaker.h
+ *
+ * Circuit breaker functionality.
+ */
+
+#ifndef CIRCUIT_BREAKER_H_
+#define CIRCUIT_BREAKER_H_
+
+#define CBRK_SUPPLY_CHK_KEY	894281
+#define CBRK_RATE_CTRL_KEY	140253
+#define CBRK_IO_SAFETY_KEY	22027
+
+#include <stdbool.h>
 
-#ifndef FIXEDWING_ATT_CONTROL_RATE_H_
-#define FIXEDWING_ATT_CONTROL_RATE_H_
+__BEGIN_DECLS
 
-#include <uORB/topics/vehicle_rates_setpoint.h>
-#include <uORB/topics/actuator_controls.h>
+__EXPORT bool circuit_breaker_enabled(const char* breaker, int32_t magic);
 
-int fixedwing_att_control_rates(const struct vehicle_rates_setpoint_s *rate_sp,
-				const float rates[],
-				struct actuator_controls_s *actuators);
+__END_DECLS
 
-#endif /* FIXEDWING_ATT_CONTROL_RATE_H_ */
+#endif /* CIRCUIT_BREAKER_H_ */
diff --git a/src/modules/systemlib/hx_stream.c b/src/modules/systemlib/hx_stream.c
index 8e9c2bfcf..52ae77de5 100644
--- a/src/modules/systemlib/hx_stream.c
+++ b/src/modules/systemlib/hx_stream.c
@@ -63,7 +63,7 @@ struct hx_stream {
 	/* TX state */
 	int			fd;
 	bool			tx_error;
-	uint8_t			*tx_buf;
+	const uint8_t		*tx_buf;
 	unsigned		tx_resid;
 	uint32_t		tx_crc;
 	enum {
diff --git a/src/modules/systemlib/mixer/mixer.h b/src/modules/systemlib/mixer/mixer.h
index 1c889a811..225570fa4 100644
--- a/src/modules/systemlib/mixer/mixer.h
+++ b/src/modules/systemlib/mixer/mixer.h
@@ -447,6 +447,7 @@ public:
 		QUAD_WIDE,	/**< quad in wide configuration */
 		HEX_X,		/**< hex in X configuration */
 		HEX_PLUS,	/**< hex in + configuration */
+		HEX_COX,
 		OCTA_X,
 		OCTA_PLUS,
 		OCTA_COX,
@@ -516,7 +517,7 @@ private:
 	float				_roll_scale;
 	float				_pitch_scale;
 	float				_yaw_scale;
-	float				_deadband;
+	float				_idle_speed;
 
 	unsigned			_rotor_count;
 	const Rotor			*_rotors;
diff --git a/src/modules/systemlib/mixer/mixer_load.c b/src/modules/systemlib/mixer/mixer_load.c
index b05273c0d..bf3428a50 100644
--- a/src/modules/systemlib/mixer/mixer_load.c
+++ b/src/modules/systemlib/mixer/mixer_load.c
@@ -41,6 +41,7 @@
 #include <string.h>
 #include <stdio.h>
 #include <ctype.h>
+#include <systemlib/err.h>
 
 #include "mixer_load.h"
 
diff --git a/src/modules/systemlib/mixer/mixer_multirotor.cpp b/src/modules/systemlib/mixer/mixer_multirotor.cpp
index bf77795d5..4b22a46d0 100644
--- a/src/modules/systemlib/mixer/mixer_multirotor.cpp
+++ b/src/modules/systemlib/mixer/mixer_multirotor.cpp
@@ -67,6 +67,11 @@
 namespace
 {
 
+float constrain(float val, float min, float max)
+{
+	return (val < min) ? min : ((val > max) ? max : val);
+}
+
 /*
  * These tables automatically generated by multi_tables - do not edit.
  */
@@ -110,6 +115,14 @@ const MultirotorMixer::Rotor _config_hex_plus[] = {
 	{  0.866025,  0.500000,  1.00 },
 	{ -0.866025, -0.500000, -1.00 },
 };
+const MultirotorMixer::Rotor _config_hex_cox[] = {
+	{ -0.866025,  0.500000, -1.00 },
+	{ -0.866025,  0.500000,  1.00 },
+	{ -0.000000, -1.000000, -1.00 },
+	{ -0.000000, -1.000000,  1.00 },
+	{  0.866025,  0.500000, -1.00 },
+	{  0.866025,  0.500000,  1.00 },
+};
 const MultirotorMixer::Rotor _config_octa_x[] = {
 	{ -0.382683,  0.923880, -1.00 },
 	{  0.382683, -0.923880, -1.00 },
@@ -147,6 +160,7 @@ const MultirotorMixer::Rotor *_config_index[MultirotorMixer::MAX_GEOMETRY] = {
 	&_config_quad_wide[0],
 	&_config_hex_x[0],
 	&_config_hex_plus[0],
+	&_config_hex_cox[0],
 	&_config_octa_x[0],
 	&_config_octa_plus[0],
 	&_config_octa_cox[0],
@@ -158,6 +172,7 @@ const unsigned _config_rotor_count[MultirotorMixer::MAX_GEOMETRY] = {
 	4, /* quad_wide */
 	6, /* hex_x */
 	6, /* hex_plus */
+	6, /* hex_cox */
 	8, /* octa_x */
 	8, /* octa_plus */
 	8, /* octa_cox */
@@ -171,12 +186,12 @@ MultirotorMixer::MultirotorMixer(ControlCallback control_cb,
 				 float roll_scale,
 				 float pitch_scale,
 				 float yaw_scale,
-				 float deadband) :
+				 float idle_speed) :
 	Mixer(control_cb, cb_handle),
 	_roll_scale(roll_scale),
 	_pitch_scale(pitch_scale),
 	_yaw_scale(yaw_scale),
-	_deadband(-1.0f + deadband),	/* shift to output range here to avoid runtime calculation */
+	_idle_speed(-1.0f + idle_speed * 2.0f),	/* shift to output range here to avoid runtime calculation */
 	_rotor_count(_config_rotor_count[geometry]),
 	_rotors(_config_index[geometry])
 {
@@ -193,7 +208,6 @@ MultirotorMixer::from_text(Mixer::ControlCallback control_cb, uintptr_t cb_handl
 	char geomname[8];
 	int s[4];
 	int used;
-	const char *end = buf + buflen;
 
 	/* enforce that the mixer ends with space or a new line */
 	for (int i = buflen - 1; i >= 0; i--) {
@@ -247,6 +261,9 @@ MultirotorMixer::from_text(Mixer::ControlCallback control_cb, uintptr_t cb_handl
 	} else if (!strcmp(geomname, "6x")) {
 		geometry = MultirotorMixer::HEX_X;
 
+	} else if (!strcmp(geomname, "6c")) {
+		geometry = MultirotorMixer::HEX_COX;
+
 	} else if (!strcmp(geomname, "8+")) {
 		geometry = MultirotorMixer::OCTA_PLUS;
 
@@ -276,67 +293,66 @@ MultirotorMixer::from_text(Mixer::ControlCallback control_cb, uintptr_t cb_handl
 unsigned
 MultirotorMixer::mix(float *outputs, unsigned space)
 {
-	float		roll    = get_control(0, 0) * _roll_scale;
+	float		roll    = constrain(get_control(0, 0) * _roll_scale, -1.0f, 1.0f);
 	//lowsyslog("roll: %d, get_control0: %d, %d\n", (int)(roll), (int)(get_control(0, 0)), (int)(_roll_scale));
-	float		pitch   = get_control(0, 1) * _pitch_scale;
-	float		yaw     = get_control(0, 2) * _yaw_scale;
-	float		thrust  = get_control(0, 3);
+	float		pitch   = constrain(get_control(0, 1) * _pitch_scale, -1.0f, 1.0f);
+	float		yaw     = constrain(get_control(0, 2) * _yaw_scale, -1.0f, 1.0f);
+	float		thrust  = constrain(get_control(0, 3), 0.0f, 1.0f);
 	//lowsyslog("thrust: %d, get_control3: %d\n", (int)(thrust), (int)(get_control(0, 3)));
-	float		max     = 0.0f;
-	float		fixup_scale;
+	float		min_out = 0.0f;
+	float		max_out = 0.0f;
 
-	/* use an output factor to prevent too strong control signals at low throttle */
-	float min_thrust = 0.05f;
-	float max_thrust = 1.0f;
-	float startpoint_full_control = 0.40f;
-	float output_factor;
+	/* perform initial mix pass yielding unbounded outputs, ignore yaw */
+	for (unsigned i = 0; i < _rotor_count; i++) {
+		float out = roll * _rotors[i].roll_scale +
+			    pitch * _rotors[i].pitch_scale +
+			    thrust;
 
-	/* keep roll, pitch and yaw control to 0 below min thrust */
-	if (thrust <= min_thrust) {
-		output_factor = 0.0f;
-		/* linearly increase the output factor from 0 to 1 between min_thrust and startpoint_full_control */
+		/* limit yaw if it causes outputs clipping */
+		if (out >= 0.0f && out < -yaw * _rotors[i].yaw_scale) {
+			yaw = -out / _rotors[i].yaw_scale;
+		}
 
-	} else if (thrust < startpoint_full_control && thrust > min_thrust) {
-		output_factor = (thrust / max_thrust) / (startpoint_full_control - min_thrust);
-		/* and then stay at full control */
+		/* calculate min and max output values */
+		if (out < min_out) {
+			min_out = out;
+		}
+		if (out > max_out) {
+			max_out = out;
+		}
 
-	} else {
-		output_factor = max_thrust;
+		outputs[i] = out;
 	}
 
-	roll *= output_factor;
-	pitch *= output_factor;
-	yaw *= output_factor;
-
-
-	/* perform initial mix pass yielding un-bounded outputs */
-	for (unsigned i = 0; i < _rotor_count; i++) {
-		float tmp = roll  * _rotors[i].roll_scale +
-			    pitch * _rotors[i].pitch_scale +
-			    yaw   * _rotors[i].yaw_scale +
-			    thrust;
+	/* scale down roll/pitch controls if some outputs are negative, don't add yaw, keep total thrust */
+	if (min_out < 0.0f) {
+		float scale_in = thrust / (thrust - min_out);
 
-		if (tmp > max)
-			max = tmp;
+		/* mix again with adjusted controls */
+		for (unsigned i = 0; i < _rotor_count; i++) {
+			outputs[i] = scale_in * (roll * _rotors[i].roll_scale + pitch * _rotors[i].pitch_scale) + thrust;
+		}
 
-		outputs[i] = tmp;
+	} else {
+		/* roll/pitch mixed without limiting, add yaw control */
+		for (unsigned i = 0; i < _rotor_count; i++) {
+			outputs[i] += yaw * _rotors[i].yaw_scale;
+		}
 	}
 
-	/* scale values into the -1.0 - 1.0 range */
-	if (max > 1.0f) {
-		fixup_scale = 2.0f / max;
+	/* scale down all outputs if some outputs are too large, reduce total thrust */
+	float scale_out;
+	if (max_out > 1.0f) {
+		scale_out = 1.0f / max_out;
 
 	} else {
-		fixup_scale = 2.0f;
+		scale_out = 1.0f;
 	}
 
-	for (unsigned i = 0; i < _rotor_count; i++)
-		outputs[i] = -1.0f + (outputs[i] * fixup_scale);
-
-	/* ensure outputs are out of the deadband */
-	for (unsigned i = 0; i < _rotor_count; i++)
-		if (outputs[i] < _deadband)
-			outputs[i] = _deadband;
+	/* scale outputs to range _idle_speed..1, and do final limiting */
+	for (unsigned i = 0; i < _rotor_count; i++) {
+		outputs[i] = constrain(_idle_speed + (outputs[i] * (1.0f - _idle_speed) * scale_out), _idle_speed, 1.0f);
+	}
 
 	return _rotor_count;
 }
diff --git a/src/modules/systemlib/mixer/multi_tables b/src/modules/systemlib/mixer/multi_tables
index 050bf2f47..b5698036e 100755
--- a/src/modules/systemlib/mixer/multi_tables
+++ b/src/modules/systemlib/mixer/multi_tables
@@ -52,6 +52,15 @@ set hex_plus {
 	 120 CW
 }
 
+set hex_cox {
+	  60 CW
+	  60 CCW
+	 180 CW
+	 180 CCW
+	 -60 CW
+	 -60 CCW
+}
+
 set octa_x {
 	  22.5 CW
 	-157.5 CW
@@ -85,7 +94,7 @@ set octa_cox {
 	-135 CW
 }
 
-set tables {quad_x quad_plus quad_v quad_wide hex_x hex_plus octa_x octa_plus octa_cox}
+set tables {quad_x quad_plus quad_v quad_wide hex_x hex_plus hex_cox octa_x octa_plus octa_cox}
 
 proc factors {a d} { puts [format "\t{ %9.6f, %9.6f, %5.2f }," [rcos [expr $a + 90]] [rcos $a] [expr -$d]]}
 
@@ -104,13 +113,13 @@ foreach table $tables {
 	puts "};"
 }
 
-puts "const MultirotorMixer::Rotor *_config_index\[MultirotorMixer::Geometry::MAX_GEOMETRY\] = {"
+puts "const MultirotorMixer::Rotor *_config_index\[MultirotorMixer::MAX_GEOMETRY\] = {"
 foreach table $tables {
 	puts [format "\t&_config_%s\[0\]," $table]
 }
 puts "};"
 
-puts "const unsigned _config_rotor_count\[MultirotorMixer::Geometry::MAX_GEOMETRY\] = {"
+puts "const unsigned _config_rotor_count\[MultirotorMixer::MAX_GEOMETRY\] = {"
 foreach table $tables {
 	upvar #0 $table angles
 	puts [format "\t%u, /* %s */" [expr [llength $angles] / 2] $table]
diff --git a/src/modules/systemlib/module.mk b/src/modules/systemlib/module.mk
index 3953b757d..147903aa0 100644
--- a/src/modules/systemlib/module.mk
+++ b/src/modules/systemlib/module.mk
@@ -1,6 +1,6 @@
 ############################################################################
 #
-#   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+#   Copyright (c) 2012-2014 PX4 Development Team. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
@@ -52,5 +52,6 @@ SRCS		 = err.c \
 		   rc_check.c \
 		   otp.c \
 		   board_serial.c \
-		   pwm_limit/pwm_limit.c
+		   pwm_limit/pwm_limit.c \
+		   circuit_breaker.c
 
diff --git a/src/modules/systemlib/otp.c b/src/modules/systemlib/otp.c
index 695574fdc..0548a9f7d 100644
--- a/src/modules/systemlib/otp.c
+++ b/src/modules/systemlib/otp.c
@@ -133,7 +133,7 @@ int lock_otp(void)
 
 
 // COMPLETE, BUSY, or other flash error?
-int F_GetStatus(void)
+static int F_GetStatus(void)
 {
 	int fs = F_COMPLETE;
 
diff --git a/src/modules/systemlib/param/param.c b/src/modules/systemlib/param/param.c
index 2d773fd25..e44e6cdb0 100644
--- a/src/modules/systemlib/param/param.c
+++ b/src/modules/systemlib/param/param.c
@@ -96,8 +96,6 @@ ORB_DEFINE(parameter_update, struct parameter_update_s);
 /** parameter update topic handle */
 static orb_advert_t param_topic = -1;
 
-static sem_t param_sem = { .semcount = 1 };
-
 /** lock the parameter store */
 static void
 param_lock(void)
@@ -521,73 +519,15 @@ param_save_default(void)
 		return ERROR;
 	}
 
-	if (res == OK) {
-		res = param_export(fd, false);
+	res = param_export(fd, false);
 
-	        if (res != OK) {
-	            warnx("failed to write parameters to file: %s", filename);
-	        }
+	if (res != OK) {
+		warnx("failed to write parameters to file: %s", filename);
 	}
 
 	close(fd);
 
 	return res;
-
-#if 0
-	const char *filename_tmp = malloc(strlen(filename) + 5);
-	sprintf(filename_tmp, "%s.tmp", filename);
-
-	/* delete temp file if exist */
-	res = unlink(filename_tmp);
-
-	if (res != OK && errno == ENOENT)
-		res = OK;
-
-	if (res != OK)
-		warn("failed to delete temp file: %s", filename_tmp);
-
-	if (res == OK) {
-		/* write parameters to temp file */
-		fd = open(filename_tmp, O_WRONLY | O_CREAT | O_EXCL);
-
-		if (fd < 0) {
-			warn("failed to open temp file: %s", filename_tmp);
-			res = ERROR;
-		}
-
-		if (res == OK) {
-			res = param_export(fd, false);
-
-			if (res != OK)
-				warnx("failed to write parameters to file: %s", filename_tmp);
-		}
-
-		close(fd);
-	}
-
-	if (res == OK) {
-		/* delete parameters file */
-		res = unlink(filename);
-
-		if (res != OK && errno == ENOENT)
-			res = OK;
-
-		if (res != OK)
-			warn("failed to delete parameters file: %s", filename);
-	}
-
-	if (res == OK) {
-		/* rename temp file to parameters */
-		res = rename(filename_tmp, filename);
-
-		if (res != OK)
-			warn("failed to rename %s to %s", filename_tmp, filename);
-	}
-
-	free(filename_tmp);
-
-	return res;
-#endif
 }
 
 /**
diff --git a/src/modules/systemlib/perf_counter.c b/src/modules/systemlib/perf_counter.c
index b4ca0ed3e..d6d8284d2 100644
--- a/src/modules/systemlib/perf_counter.c
+++ b/src/modules/systemlib/perf_counter.c
@@ -282,12 +282,18 @@ perf_reset(perf_counter_t handle)
 void
 perf_print_counter(perf_counter_t handle)
 {
+	perf_print_counter_fd(0, handle);
+}
+
+void
+perf_print_counter_fd(int fd, perf_counter_t handle)
+{
 	if (handle == NULL)
 		return;
 
 	switch (handle->type) {
 	case PC_COUNT:
-		printf("%s: %llu events\n",
+		dprintf(fd, "%s: %llu events\n",
 		       handle->name,
 		       ((struct perf_ctr_count *)handle)->event_count);
 		break;
@@ -295,7 +301,7 @@ perf_print_counter(perf_counter_t handle)
 	case PC_ELAPSED: {
 		struct perf_ctr_elapsed *pce = (struct perf_ctr_elapsed *)handle;
 
-		printf("%s: %llu events, %lluus elapsed, %llu avg, min %lluus max %lluus\n",
+		dprintf(fd, "%s: %llu events, %lluus elapsed, %lluus avg, min %lluus max %lluus\n",
 		       handle->name,
 		       pce->event_count,
 		       pce->time_total,
@@ -308,7 +314,7 @@ perf_print_counter(perf_counter_t handle)
 	case PC_INTERVAL: {
 		struct perf_ctr_interval *pci = (struct perf_ctr_interval *)handle;
 
-		printf("%s: %llu events, %llu avg, min %lluus max %lluus\n",
+		dprintf(fd, "%s: %llu events, %lluus avg, min %lluus max %lluus\n",
 		       handle->name,
 		       pci->event_count,
 		       (pci->time_last - pci->time_first) / pci->event_count,
@@ -349,12 +355,12 @@ perf_event_count(perf_counter_t handle)
 }
 
 void
-perf_print_all(void)
+perf_print_all(int fd)
 {
 	perf_counter_t handle = (perf_counter_t)sq_peek(&perf_counters);
 
 	while (handle != NULL) {
-		perf_print_counter(handle);
+		perf_print_counter_fd(fd, handle);
 		handle = (perf_counter_t)sq_next(&handle->link);
 	}
 }
diff --git a/src/modules/systemlib/perf_counter.h b/src/modules/systemlib/perf_counter.h
index d8f69fdbf..668d9dfdf 100644
--- a/src/modules/systemlib/perf_counter.h
+++ b/src/modules/systemlib/perf_counter.h
@@ -75,7 +75,7 @@ __EXPORT extern void		perf_free(perf_counter_t handle);
 /**
  * Count a performance event.
  *
- * This call only affects counters that take single events; PC_COUNT etc.
+ * This call only affects counters that take single events; PC_COUNT, PC_INTERVAL etc.
  *
  * @param handle		The handle returned from perf_alloc.
  */
@@ -121,16 +121,26 @@ __EXPORT extern void		perf_cancel(perf_counter_t handle);
 __EXPORT extern void		perf_reset(perf_counter_t handle);
 
 /**
- * Print one performance counter.
+ * Print one performance counter to stdout
  *
  * @param handle		The counter to print.
  */
 __EXPORT extern void		perf_print_counter(perf_counter_t handle);
 
 /**
+ * Print one performance counter to a fd.
+ *
+ * @param fd			File descriptor to print to - e.g. 0 for stdout
+ * @param handle		The counter to print.
+ */
+__EXPORT extern void		perf_print_counter_fd(int fd, perf_counter_t handle);
+
+/**
  * Print all of the performance counters.
+ *
+ * @param fd			File descriptor to print to - e.g. 0 for stdout
  */
-__EXPORT extern void		perf_print_all(void);
+__EXPORT extern void		perf_print_all(int fd);
 
 /**
  * Reset all of the performance counters.
diff --git a/src/modules/systemlib/pid/pid.c b/src/modules/systemlib/pid/pid.c
index 6a4e9392a..45f218a5b 100644
--- a/src/modules/systemlib/pid/pid.c
+++ b/src/modules/systemlib/pid/pid.c
@@ -53,7 +53,7 @@
 
 #define SIGMA 0.000001f
 
-__EXPORT void pid_init(PID_t *pid, uint8_t mode, float dt_min)
+__EXPORT void pid_init(PID_t *pid, pid_mode_t mode, float dt_min)
 {
 	pid->mode = mode;
 	pid->dt_min = dt_min;
diff --git a/src/modules/systemlib/pwm_limit/pwm_limit.c b/src/modules/systemlib/pwm_limit/pwm_limit.c
index 190b315f1..c733a53d7 100644
--- a/src/modules/systemlib/pwm_limit/pwm_limit.c
+++ b/src/modules/systemlib/pwm_limit/pwm_limit.c
@@ -97,7 +97,6 @@ void pwm_limit_calc(const bool armed, const unsigned num_channels, const uint16_
 	}
 
 	unsigned progress;
-	uint16_t temp_pwm;
 
 	/* then set effective_pwm based on state */
 	switch (limit->state) {
@@ -136,12 +135,26 @@ void pwm_limit_calc(const bool armed, const unsigned num_channels, const uint16_
 					}
 
 					effective_pwm[i] = output[i] * (max_pwm[i] - ramp_min_pwm)/2 + (max_pwm[i] + ramp_min_pwm)/2;
+
+					/* last line of defense against invalid inputs */
+					if (effective_pwm[i] < ramp_min_pwm) {
+						effective_pwm[i] = ramp_min_pwm;
+					} else if (effective_pwm[i] > max_pwm[i]) {
+						effective_pwm[i] = max_pwm[i];
+					}
 				}
 			}
 			break;
 		case PWM_LIMIT_STATE_ON:
 			for (unsigned i=0; i<num_channels; i++) {
 				effective_pwm[i] = output[i] * (max_pwm[i] - min_pwm[i])/2 + (max_pwm[i] + min_pwm[i])/2;
+
+				/* last line of defense against invalid inputs */
+				if (effective_pwm[i] < min_pwm[i]) {
+					effective_pwm[i] = min_pwm[i];
+				} else if (effective_pwm[i] > max_pwm[i]) {
+					effective_pwm[i] = max_pwm[i];
+				}
 			}
 			break;
 		default:
diff --git a/src/modules/systemlib/rc_check.c b/src/modules/systemlib/rc_check.c
index 21e15ec56..b35b333af 100644
--- a/src/modules/systemlib/rc_check.c
+++ b/src/modules/systemlib/rc_check.c
@@ -42,6 +42,7 @@
 #include <stdio.h>
 #include <fcntl.h>
 
+#include <systemlib/err.h>
 #include <systemlib/rc_check.h>
 #include <systemlib/param/param.h>
 #include <mavlink/mavlink_log.h>
@@ -98,32 +99,32 @@ int rc_calibration_check(int mavlink_fd) {
 		/* assert min..center..max ordering */
 		if (param_min < 500) {
 			count++;
-			mavlink_log_critical(mavlink_fd, "ERR: RC_%d_MIN < 500", i+1);
+			mavlink_log_critical(mavlink_fd, "#audio ERR: RC_%d_MIN < 500", i+1);
 			/* give system time to flush error message in case there are more */
 			usleep(100000);
 		}
 		if (param_max > 2500) {
 			count++;
-			mavlink_log_critical(mavlink_fd, "ERR: RC_%d_MAX > 2500", i+1);
+			mavlink_log_critical(mavlink_fd, "#audio ERR: RC_%d_MAX > 2500", i+1);
 			/* give system time to flush error message in case there are more */
 			usleep(100000);
 		}
 		if (param_trim < param_min) {
 			count++;
-			mavlink_log_critical(mavlink_fd, "ERR: RC_%d_TRIM < MIN (%d/%d)", i+1, (int)param_trim, (int)param_min);
+			mavlink_log_critical(mavlink_fd, "#audio ERR: RC_%d_TRIM < MIN (%d/%d)", i+1, (int)param_trim, (int)param_min);
 			/* give system time to flush error message in case there are more */
 			usleep(100000);
 		}
 		if (param_trim > param_max) {
 			count++;
-			mavlink_log_critical(mavlink_fd, "ERR: RC_%d_TRIM > MAX (%d/%d)", i+1, (int)param_trim, (int)param_max);
+			mavlink_log_critical(mavlink_fd, "#audio ERR: RC_%d_TRIM > MAX (%d/%d)", i+1, (int)param_trim, (int)param_max);
 			/* give system time to flush error message in case there are more */
 			usleep(100000);
 		}
 
 		/* assert deadzone is sane */
 		if (param_dz > 500) {
-			mavlink_log_critical(mavlink_fd, "ERR: RC_%d_DZ > 500", i+1);
+			mavlink_log_critical(mavlink_fd, "#audio ERR: RC_%d_DZ > 500", i+1);
 			/* give system time to flush error message in case there are more */
 			usleep(100000);
 			count++;
@@ -139,8 +140,8 @@ int rc_calibration_check(int mavlink_fd) {
 
 		/* sanity checks pass, enable channel */
 		if (count) {
-			mavlink_log_critical(mavlink_fd, "ERROR: %d config error(s) for RC channel %d.", count, (i + 1));
-			warnx(mavlink_fd, "ERROR: %d config error(s) for RC channel %d.", count, (i + 1));
+			mavlink_log_critical(mavlink_fd, "#audio ERROR: %d config error(s) for RC channel %d.", count, (i + 1));
+			warnx("ERROR: %d config error(s) for RC channel %d.", count, (i + 1));
 			usleep(100000);
 		}
 
diff --git a/src/modules/systemlib/state_table.h b/src/modules/systemlib/state_table.h
index f2709d29f..e6011fdef 100644
--- a/src/modules/systemlib/state_table.h
+++ b/src/modules/systemlib/state_table.h
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+ *   Copyright (C) 2013-2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -33,8 +33,9 @@
 
 /**
  * @file state_table.h
- * 
+ *
  * Finite-State-Machine helper class for state table
+ * @author: Julian Oes <julian@oes.ch>
  */
 
 #ifndef __SYSTEMLIB_STATE_TABLE_H
@@ -48,22 +49,28 @@ public:
 		Action action;
 		unsigned nextState;
 	};
-	
+
 	StateTable(Tran const *table, unsigned nStates, unsigned nSignals)
 	: myTable(table), myNsignals(nSignals), myNstates(nStates) {}
-	
+
 	#define NO_ACTION &StateTable::doNothing
-	#define ACTION(_target) static_cast<StateTable::Action>(_target)
+	#define ACTION(_target) StateTable::Action(_target)
 
 	virtual ~StateTable() {}
-	
+
 	void dispatch(unsigned const sig) {
-		register Tran const *t = myTable + myState*myNsignals + sig;
-		(this->*(t->action))();
+		/* get transition using state table */
+		Tran const *t = myTable + myState*myNsignals + sig;
 
+		/* accept new state */
 		myState = t->nextState;
+
+		/*  */
+		(this->*(t->action))();
+	}
+	void doNothing() {
+		return;
 	}
-	void doNothing() {}
 protected:
 	unsigned myState;
 private:
@@ -72,4 +79,4 @@ private:
 	unsigned myNstates;
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/modules/systemlib/system_params.c b/src/modules/systemlib/system_params.c
index ec2bc3a9a..702e435ac 100644
--- a/src/modules/systemlib/system_params.c
+++ b/src/modules/systemlib/system_params.c
@@ -62,12 +62,23 @@ PARAM_DEFINE_INT32(SYS_AUTOSTART, 0);
 PARAM_DEFINE_INT32(SYS_AUTOCONFIG, 0);
 
 /**
- * Set usage of IO board
- *
- * Can be used to use a standard startup script but with a FMU only set-up. Set to 0 to force the FMU only set-up.
- *
- * @min 0
- * @max 1
- * @group System
- */
+* Set usage of IO board
+*
+* Can be used to use a standard startup script but with a FMU only set-up. Set to 0 to force the FMU only set-up.
+*
+* @min 0
+* @max 1
+* @group System
+*/
 PARAM_DEFINE_INT32(SYS_USE_IO, 1);
+
+/**
+* Set restart type
+*
+* Set by px4io to indicate type of restart
+*
+* @min 0
+* @max 2
+* @group System
+*/
+PARAM_DEFINE_INT32(SYS_RESTART_TYPE, 2);
diff --git a/src/modules/systemlib/systemlib.c b/src/modules/systemlib/systemlib.c
index 57a751e1c..9fff3eb88 100644
--- a/src/modules/systemlib/systemlib.c
+++ b/src/modules/systemlib/systemlib.c
@@ -64,6 +64,9 @@ systemreset(bool to_bootloader)
 		*(uint32_t *)0x40002850 = 0xb007b007;
 	}
 	up_systemreset();
+
+	/* lock up here */
+	while(true);
 }
 
 static void kill_task(FAR struct tcb_s *tcb, FAR void *arg);
diff --git a/src/modules/uORB/Publication.cpp b/src/modules/uORB/Publication.cpp
index 5a5981617..cd0b30dd6 100644
--- a/src/modules/uORB/Publication.cpp
+++ b/src/modules/uORB/Publication.cpp
@@ -47,6 +47,7 @@
 #include "topics/vehicle_rates_setpoint.h"
 #include "topics/actuator_outputs.h"
 #include "topics/encoders.h"
+#include "topics/tecs_status.h"
 
 namespace uORB {
 
@@ -76,5 +77,6 @@ template class __EXPORT Publication<vehicle_attitude_setpoint_s>;
 template class __EXPORT Publication<vehicle_rates_setpoint_s>;
 template class __EXPORT Publication<actuator_outputs_s>;
 template class __EXPORT Publication<encoders_s>;
+template class __EXPORT Publication<tecs_status_s>;
 
 }
diff --git a/src/modules/uORB/objects_common.cpp b/src/modules/uORB/objects_common.cpp
index 4b31cc8a4..7c3bb0009 100644
--- a/src/modules/uORB/objects_common.cpp
+++ b/src/modules/uORB/objects_common.cpp
@@ -90,6 +90,9 @@ ORB_DEFINE(battery_status, struct battery_status_s);
 #include "topics/servorail_status.h"
 ORB_DEFINE(servorail_status, struct servorail_status_s);
 
+#include "topics/system_power.h"
+ORB_DEFINE(system_power, struct system_power_s);
+
 #include "topics/vehicle_global_position.h"
 ORB_DEFINE(vehicle_global_position, struct vehicle_global_position_s);
 
@@ -124,7 +127,7 @@ ORB_DEFINE(position_setpoint_triplet, struct position_setpoint_triplet_s);
 ORB_DEFINE(vehicle_global_velocity_setpoint, struct vehicle_global_velocity_setpoint_s);
 
 #include "topics/mission.h"
-ORB_DEFINE(mission, struct mission_s);
+ORB_DEFINE(offboard_mission, struct mission_s);
 ORB_DEFINE(onboard_mission, struct mission_s);
 
 #include "topics/mission_result.h"
@@ -196,3 +199,9 @@ ORB_DEFINE(encoders, struct encoders_s);
 
 #include "topics/estimator_status.h"
 ORB_DEFINE(estimator_status, struct estimator_status_report);
+
+#include "topics/tecs_status.h"
+ORB_DEFINE(tecs_status, struct tecs_status_s);
+
+#include "topics/wind_estimate.h"
+ORB_DEFINE(wind_estimate, struct wind_estimate_s);
diff --git a/src/modules/uORB/topics/actuator_armed.h b/src/modules/uORB/topics/actuator_armed.h
index 6e944ffee..a98d3fc3a 100644
--- a/src/modules/uORB/topics/actuator_armed.h
+++ b/src/modules/uORB/topics/actuator_armed.h
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2013 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -44,15 +44,25 @@
 #include <stdint.h>
 #include "../uORB.h"
 
+/**
+ * @addtogroup topics
+ * @{
+ */
+
 /** global 'actuator output is live' control. */
 struct actuator_armed_s {
 
-	uint64_t	timestamp;
-	bool	armed;		/**< Set to true if system is armed */
-	bool	ready_to_arm;	/**< Set to true if system is ready to be armed */
-	bool	lockdown;	/**< Set to true if actuators are forced to being disabled (due to emergency or HIL) */
+	uint64_t	timestamp;	/**< Microseconds since system boot */
+	bool		armed;		/**< Set to true if system is armed */
+	bool		ready_to_arm;	/**< Set to true if system is ready to be armed */
+	bool		lockdown;	/**< Set to true if actuators are forced to being disabled (due to emergency or HIL) */
 };
 
+/**
+ * @}
+ */
+
+/* register this as object request broker structure */
 ORB_DECLARE(actuator_armed);
 
 #endif
\ No newline at end of file
diff --git a/src/modules/uORB/topics/airspeed.h b/src/modules/uORB/topics/airspeed.h
index a3da3758f..d2ee754cd 100644
--- a/src/modules/uORB/topics/airspeed.h
+++ b/src/modules/uORB/topics/airspeed.h
@@ -52,9 +52,10 @@
  * Airspeed
  */
 struct airspeed_s {
-	uint64_t	timestamp;					/**< microseconds since system boot, needed to integrate */
+	uint64_t	timestamp;			/**< microseconds since system boot, needed to integrate */
 	float		indicated_airspeed_m_s;		/**< indicated airspeed in meters per second, -1 if unknown	 */
-	float		true_airspeed_m_s;			/**< true airspeed in meters per second, -1 if unknown */
+	float		true_airspeed_m_s;		/**< true airspeed in meters per second, -1 if unknown */
+	float		air_temperature_celsius;	/**< air temperature in degrees celsius, -1000 if unknown */
 };
 
 /**
diff --git a/src/modules/uORB/topics/differential_pressure.h b/src/modules/uORB/topics/differential_pressure.h
index ff88b04c6..01e14cda9 100644
--- a/src/modules/uORB/topics/differential_pressure.h
+++ b/src/modules/uORB/topics/differential_pressure.h
@@ -52,13 +52,14 @@
  * Differential pressure.
  */
 struct differential_pressure_s {
-	uint64_t	timestamp;			/**< microseconds since system boot, needed to integrate */
-	uint64_t	error_count;
+	uint64_t	timestamp;			/**< Microseconds since system boot, needed to integrate */
+	uint64_t	error_count;			/**< Number of errors detected by driver */
 	float	differential_pressure_pa;		/**< Differential pressure reading */
+	float	differential_pressure_raw_pa;		/**< Raw differential pressure reading (may be negative) */
 	float	differential_pressure_filtered_pa;	/**< Low pass filtered differential pressure reading */
 	float	max_differential_pressure_pa;		/**< Maximum differential pressure reading */
-	float		voltage;			/**< Voltage from analog airspeed sensors (voltage divider already compensated) */
-	float		temperature;			/**< Temperature provided by sensor, -1000.0f if unknown */
+	float	voltage;				/**< Voltage from analog airspeed sensors (voltage divider already compensated) */
+	float	temperature;				/**< Temperature provided by sensor, -1000.0f if unknown */
 
 };
 
diff --git a/src/modules/uORB/topics/estimator_status.h b/src/modules/uORB/topics/estimator_status.h
index 5530cdb21..7f26b505b 100644
--- a/src/modules/uORB/topics/estimator_status.h
+++ b/src/modules/uORB/topics/estimator_status.h
@@ -64,9 +64,9 @@ struct estimator_status_report {
 	uint64_t timestamp;			/**< Timestamp in microseconds since boot */
 	float states[32];			/**< Internal filter states */
 	float n_states;				/**< Number of states effectively used */
-	bool states_nan;			/**< If set to true, one of the states is NaN */
-	bool covariance_nan;			/**< If set to true, the covariance matrix went NaN */
-	bool kalman_gain_nan;			/**< If set to true, the Kalman gain matrix went NaN */
+	uint8_t nan_flags;			/**< Bitmask to indicate NaN states */
+	uint8_t health_flags;			/**< Bitmask to indicate sensor health states (vel, pos, hgt) */
+	uint8_t timeout_flags;			/**< Bitmask to indicate timeout flags (vel, pos, hgt) */
 
 };
 
diff --git a/src/modules/uORB/topics/home_position.h b/src/modules/uORB/topics/home_position.h
index 08d11abae..70071130d 100644
--- a/src/modules/uORB/topics/home_position.h
+++ b/src/modules/uORB/topics/home_position.h
@@ -59,10 +59,13 @@ struct home_position_s
 {
 	uint64_t timestamp;			/**< Timestamp (microseconds since system boot)	*/
 
-	//bool altitude_is_relative;	// TODO what means home relative altitude? we need clear definition of reference altitude then
 	double lat;				/**< Latitude in degrees 			*/
 	double lon;				/**< Longitude in degrees			*/
 	float alt;				/**< Altitude in meters				*/
+
+	float x;				/**< X coordinate in meters			*/
+	float y;				/**< Y coordinate in meters			*/
+	float z;				/**< Z coordinate in meters			*/
 };
 
 /**
diff --git a/src/modules/uORB/topics/manual_control_setpoint.h b/src/modules/uORB/topics/manual_control_setpoint.h
index eac6d6e98..910b8a623 100644
--- a/src/modules/uORB/topics/manual_control_setpoint.h
+++ b/src/modules/uORB/topics/manual_control_setpoint.h
@@ -44,6 +44,16 @@
 #include "../uORB.h"
 
 /**
+ * Switch position
+ */
+typedef enum {
+	SWITCH_POS_NONE = 0,	/**< switch is not mapped */
+	SWITCH_POS_ON,			/**< switch activated (value = 1) */
+	SWITCH_POS_MIDDLE,		/**< middle position (value = 0) */
+	SWITCH_POS_OFF			/**< switch not activated (value = -1) */
+} switch_pos_t;
+
+/**
  * @addtogroup topics
  * @{
  */
@@ -51,32 +61,43 @@
 struct manual_control_setpoint_s {
 	uint64_t timestamp;
 
-	float roll;			 	/**< ailerons roll / roll rate input */
-	float pitch;				/**< elevator / pitch / pitch rate */
-	float yaw;				/**< rudder / yaw rate / yaw */
-	float throttle;				/**< throttle / collective thrust / altitude */
-
-	float mode_switch;			/**< mode 3 position switch (mandatory): manual, assisted, auto */
-	float return_switch;			/**< land 2 position switch (mandatory): land, no effect */
-	float assisted_switch;			/**< assisted 2 position switch (optional): seatbelt, simple */
-	float mission_switch;		/**< mission 2 position switch (optional): mission, loiter */
-
 	/**
-	 * Any of the channels below may not be available and be set to NaN
+	 * Any of the channels may not be available and be set to NaN
 	 * to indicate that it does not contain valid data.
+	 * The variable names follow the definition of the
+	 * MANUAL_CONTROL mavlink message.
+	 * The default range is from -1 to 1 (mavlink message -1000 to 1000)
+	 * The range for the z variable is defined from 0 to 1. (The z field of
+	 * the MANUAL_CONTROL mavlink message is defined from -1000 to 1000)
 	 */
+	float x;			/**< stick position in x direction -1..1
+					  in general corresponds to forward/back motion or pitch of vehicle,
+					  in general a positive value means forward or negative pitch and
+					  a negative value means backward or positive pitch */
+	float y;			/**< stick position in y direction -1..1
+					  in general corresponds to right/left motion or roll of vehicle,
+					  in general a positive value means right or positive roll and
+					  a negative value means left or negative roll */
+	float z;			/**< throttle stick position 0..1
+					  in general corresponds to up/down motion or thrust of vehicle,
+					  in general the value corresponds to the demanded throttle by the user,
+					  if the input is used for setting the setpoint of a vertical position
+					  controller any value > 0.5 means up and any value < 0.5 means down */
+	float r;			/**< yaw stick/twist positon, -1..1
+					  in general corresponds to the righthand rotation around the vertical
+					  (downwards) axis of the vehicle */
+	float flaps;			/**< flap position */
+	float aux1;			/**< default function: camera yaw / azimuth */
+	float aux2;			/**< default function: camera pitch / tilt */
+	float aux3;			/**< default function: camera trigger */
+	float aux4;			/**< default function: camera roll */
+	float aux5;			/**< default function: payload drop */
 
-	// XXX needed or parameter?
-	//float auto_offboard_input_switch;	/**< controller setpoint source (0 = onboard, 1 = offboard) */
-
-	float flaps;				/**< flap position */
-
-	float aux1;				/**< default function: camera yaw / azimuth */
-	float aux2;				/**< default function: camera pitch / tilt */
-	float aux3;				/**< default function: camera trigger */
-	float aux4;				/**< default function: camera roll */
-	float aux5;				/**< default function: payload drop */
-
+	switch_pos_t mode_switch;			/**< main mode 3 position switch (mandatory): _MANUAL_, ASSIST, AUTO */
+	switch_pos_t return_switch;			/**< return to launch 2 position switch (mandatory): _NORMAL_, RTL */
+	switch_pos_t posctl_switch;			/**< position control 2 position switch (optional): _ALTCTL_, POSCTL */
+	switch_pos_t loiter_switch;			/**< loiter 2 position switch (optional): _MISSION_, LOITER */
+	switch_pos_t acro_switch;			/**< acro 2 position switch (optional): _MANUAL_, ACRO */
 }; /**< manual control inputs */
 
 /**
diff --git a/src/modules/uORB/topics/mission.h b/src/modules/uORB/topics/mission.h
index 9594c4c6a..d9dd61df1 100644
--- a/src/modules/uORB/topics/mission.h
+++ b/src/modules/uORB/topics/mission.h
@@ -1,9 +1,6 @@
 /****************************************************************************
  *
  *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: @author Thomas Gubler <thomasgubler@student.ethz.ch>
- *           @author Julian Oes <joes@student.ethz.ch>
- *           @author Lorenz Meier <lm@inf.ethz.ch>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -37,6 +34,9 @@
 /**
  * @file mission.h
  * Definition of a mission consisting of mission items.
+ * @author Thomas Gubler <thomasgubler@student.ethz.ch>
+ * @author Julian Oes <joes@student.ethz.ch>
+ * @author Lorenz Meier <lm@inf.ethz.ch>
  */
 
 #ifndef TOPIC_MISSION_H_
@@ -50,6 +50,7 @@
 
 /* compatible to mavlink MAV_CMD */
 enum NAV_CMD {
+	NAV_CMD_IDLE=0,
 	NAV_CMD_WAYPOINT=16,
 	NAV_CMD_LOITER_UNLIMITED=17,
 	NAV_CMD_LOITER_TURN_COUNT=18,
@@ -58,7 +59,8 @@ enum NAV_CMD {
 	NAV_CMD_LAND=21,
 	NAV_CMD_TAKEOFF=22,
 	NAV_CMD_ROI=80,
-	NAV_CMD_PATHPLANNING=81
+	NAV_CMD_PATHPLANNING=81,
+	NAV_CMD_DO_JUMP=177
 };
 
 enum ORIGIN {
@@ -91,6 +93,9 @@ struct mission_item_s {
 	float pitch_min;		/**< minimal pitch angle for fixed wing takeoff waypoints */
 	bool autocontinue;		/**< true if next waypoint should follow after this one */
 	enum ORIGIN origin;		/**< where the waypoint has been generated		*/
+	int do_jump_mission_index;	/**< index where the do jump will go to                 */
+	unsigned do_jump_repeat_count;	/**< how many times do jump needs to be done            */
+	unsigned do_jump_current_count;	/**< count how many times the jump has been done	*/
 };
 
 struct mission_s
@@ -105,7 +110,7 @@ struct mission_s
  */
 
 /* register this as object request broker structure */
-ORB_DECLARE(mission);
+ORB_DECLARE(offboard_mission);
 ORB_DECLARE(onboard_mission);
 
 #endif
diff --git a/src/modules/uORB/topics/mission_result.h b/src/modules/uORB/topics/mission_result.h
index 7c3921198..ad654a9ff 100644
--- a/src/modules/uORB/topics/mission_result.h
+++ b/src/modules/uORB/topics/mission_result.h
@@ -56,6 +56,7 @@ struct mission_result_s
 	bool mission_reached;		/**< true if mission has been reached			*/
 	unsigned mission_index_reached;	/**< index of the mission which has been reached	*/
 	unsigned index_current_mission; /**< index of the current mission			*/
+	bool mission_finished;		/**< true if mission has been completed			*/
 };
 
 /**
diff --git a/src/modules/uORB/topics/optical_flow.h b/src/modules/uORB/topics/optical_flow.h
index 98f0e3fa2..0196ae86b 100644
--- a/src/modules/uORB/topics/optical_flow.h
+++ b/src/modules/uORB/topics/optical_flow.h
@@ -57,6 +57,7 @@ struct optical_flow_s {
 
 	uint64_t timestamp;		/**< in microseconds since system start          */
 
+	uint64_t flow_timestamp;		/**< timestamp from flow sensor */
 	int16_t flow_raw_x;		/**< flow in pixels in X direction, not rotation-compensated */
 	int16_t flow_raw_y;		/**< flow in pixels in Y direction, not rotation-compensated */
 	float flow_comp_x_m;		/**< speed over ground in meters, rotation-compensated */
diff --git a/src/modules/uORB/topics/position_setpoint_triplet.h b/src/modules/uORB/topics/position_setpoint_triplet.h
index 34aaa30dd..ce42035ba 100644
--- a/src/modules/uORB/topics/position_setpoint_triplet.h
+++ b/src/modules/uORB/topics/position_setpoint_triplet.h
@@ -1,9 +1,6 @@
 /****************************************************************************
  *
  *   Copyright (C) 2013 PX4 Development Team. All rights reserved.
- *   Author: @author Thomas Gubler <thomasgubler@student.ethz.ch>
- *           @author Julian Oes <joes@student.ethz.ch>
- *           @author Lorenz Meier <lm@inf.ethz.ch>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -37,6 +34,10 @@
 /**
  * @file mission_item_triplet.h
  * Definition of the global WGS84 position setpoint uORB topic.
+ *
+ * @author Thomas Gubler <thomasgubler@student.ethz.ch>
+ * @author Julian Oes <joes@student.ethz.ch>
+ * @author Lorenz Meier <lm@inf.ethz.ch>
  */
 
 #ifndef TOPIC_MISSION_ITEM_TRIPLET_H_
@@ -45,7 +46,6 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include "../uORB.h"
-#include <navigator/navigator_state.h>
 
 /**
  * @addtogroup topics
@@ -54,11 +54,12 @@
 
 enum SETPOINT_TYPE
 {
-	SETPOINT_TYPE_NORMAL = 0,		/**< normal setpoint */
-	SETPOINT_TYPE_LOITER,			/**< loiter setpoint */
-	SETPOINT_TYPE_TAKEOFF,			/**< takeoff setpoint */
-	SETPOINT_TYPE_LAND,			/**< land setpoint, altitude must be ignored, vehicle must descend until landing */
-	SETPOINT_TYPE_IDLE,			/**< do nothing, switch off motors or keep at idle speed (MC) */
+	SETPOINT_TYPE_POSITION = 0,	/**< position setpoint */
+	SETPOINT_TYPE_VELOCITY,		/**< velocity setpoint */
+	SETPOINT_TYPE_LOITER,		/**< loiter setpoint */
+	SETPOINT_TYPE_TAKEOFF,		/**< takeoff setpoint */
+	SETPOINT_TYPE_LAND,		/**< land setpoint, altitude must be ignored, descend until landing */
+	SETPOINT_TYPE_IDLE,		/**< do nothing, switch off motors or keep at idle speed (MC) */
 };
 
 struct position_setpoint_s
@@ -84,8 +85,6 @@ struct position_setpoint_triplet_s
 	struct position_setpoint_s previous;
 	struct position_setpoint_s current;
 	struct position_setpoint_s next;
-
-	nav_state_t nav_state;			/**< navigation state */
 };
 
 /**
diff --git a/src/modules/uORB/topics/rc_channels.h b/src/modules/uORB/topics/rc_channels.h
index 6eb20efd1..829d8e57d 100644
--- a/src/modules/uORB/topics/rc_channels.h
+++ b/src/modules/uORB/topics/rc_channels.h
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2012-2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -43,57 +43,43 @@
 #include "../uORB.h"
 
 /**
- * The number of RC channel inputs supported.
- * Current (Q4/2013) radios support up to 18 channels,
- * leaving at a sane value of 15.
- * This number can be greater then number of RC channels,
- * because single RC channel can be mapped to multiple
- * functions, e.g. for various mode switches.
- */
-#define RC_CHANNELS_MAPPED_MAX   15
-
-/**
  * This defines the mapping of the RC functions.
  * The value assigned to the specific function corresponds to the entry of
- * the channel array chan[].
+ * the channel array channels[].
  */
 enum RC_CHANNELS_FUNCTION {
 	THROTTLE = 0,
-	ROLL     = 1,
-	PITCH    = 2,
-	YAW      = 3,
-	MODE = 4,
-	RETURN = 5,
-	ASSISTED = 6,
-	MISSION = 7,
-	OFFBOARD_MODE = 8,
-	FLAPS   = 9,
-	AUX_1   = 10,
-	AUX_2   = 11,
-	AUX_3   = 12,
-	AUX_4   = 13,
-	AUX_5   = 14,
-	RC_CHANNELS_FUNCTION_MAX /**< indicates the number of functions. There can be more functions than RC channels. */
+	ROLL,
+	PITCH,
+	YAW,
+	MODE,
+	RETURN,
+	POSCTL,
+	LOITER,
+	OFFBOARD_MODE,
+	ACRO,
+	FLAPS,
+	AUX_1,
+	AUX_2,
+	AUX_3,
+	AUX_4,
+	AUX_5,
+	RC_CHANNELS_FUNCTION_MAX /**< Indicates the number of functions. There can be more functions than RC channels. */
 };
 
 /**
  * @addtogroup topics
  * @{
  */
-
 struct rc_channels_s {
-
-	uint64_t timestamp;                 /**< In microseconds since boot time. */
-	uint64_t timestamp_last_valid;      /**< timestamp of last valid RC signal. */
-	struct {
-		float scaled;                     /**< Scaled to -1..1 (throttle: 0..1) */
-	} chan[RC_CHANNELS_MAPPED_MAX];
-	uint8_t chan_count;                 /**< number of valid channels */
-
-	/*String array to store the names of the functions*/
-	char function_name[RC_CHANNELS_FUNCTION_MAX][20];
-	int8_t function[RC_CHANNELS_FUNCTION_MAX];
-	uint8_t rssi;                       /**< Overall receive signal strength */
+	uint64_t timestamp;									/**< Timestamp in microseconds since boot time */
+	uint64_t timestamp_last_valid;						/**< Timestamp of last valid RC signal */
+	float channels[RC_CHANNELS_FUNCTION_MAX];			/**< Scaled to -1..1 (throttle: 0..1) */
+	uint8_t channel_count;								/**< Number of valid channels */
+	char function_name[RC_CHANNELS_FUNCTION_MAX][20];	/**< String array to store the names of the functions */
+	int8_t function[RC_CHANNELS_FUNCTION_MAX];			/**< Functions mapping */
+	uint8_t rssi;										/**< Receive signal strength index */
+	bool signal_lost;									/**< Control signal lost, should be checked together with topic timeout */
 }; /**< radio control channels. */
 
 /**
diff --git a/src/modules/uORB/topics/system_power.h b/src/modules/uORB/topics/system_power.h
new file mode 100644
index 000000000..7763b6004
--- /dev/null
+++ b/src/modules/uORB/topics/system_power.h
@@ -0,0 +1,71 @@
+/****************************************************************************
+ *
+ *   Copyright (C) 2012-2013 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file system_power.h
+ *
+ * Definition of the system_power voltage and power status uORB topic.
+ */
+
+#ifndef SYSTEM_POWER_H_
+#define SYSTEM_POWER_H_
+
+#include "../uORB.h"
+#include <stdint.h>
+
+/**
+ * @addtogroup topics
+ * @{
+ */
+
+/**
+ * voltage and power supply status
+ */
+struct system_power_s {
+	uint64_t	timestamp;		/**< microseconds since system boot */
+	float   	voltage5V_v;		/**< peripheral 5V rail voltage */
+	uint8_t         usb_connected:1;        /**< USB is connected when 1 */
+	uint8_t         brick_valid:1;          /**< brick power is good when 1 */
+	uint8_t         servo_valid:1;          /**< servo power is good when 1 */
+	uint8_t		periph_5V_OC:1;         /**< peripheral overcurrent when 1 */
+	uint8_t		hipower_5V_OC:1;        /**< hi power peripheral overcurrent when 1 */
+};
+
+/**
+ * @}
+ */
+
+/* register this as object request broker structure */
+ORB_DECLARE(system_power);
+
+#endif
diff --git a/src/modules/position_estimator_mc/position_estimator_mc_params.c b/src/modules/uORB/topics/tecs_status.h
index 72e5bc73b..c4d0c1874 100755..100644
--- a/src/modules/position_estimator_mc/position_estimator_mc_params.c
+++ b/src/modules/uORB/topics/tecs_status.h
@@ -1,9 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: 	Damian Aregger <daregger@student.ethz.ch>
- *   			Tobias Naegeli <naegelit@student.ethz.ch>
-* 				Lorenz Meier <lm@inf.ethz.ch>
+ *   Copyright (c) 2012-2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -34,35 +31,63 @@
  *
  ****************************************************************************/
 
-/*
- * @file position_estimator_mc_params.c
- * 
- * Parameters for position_estimator_mc
+/**
+ * @file vehicle_global_position.h
+ * Definition of the global fused WGS84 position uORB topic.
+ *
+ * @author Thomas Gubler <thomasgubler@student.ethz.ch>
+ */
+
+#ifndef TECS_STATUS_T_H_
+#define TECS_STATUS_T_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "../uORB.h"
+
+/**
+ * @addtogroup topics
+ * @{
  */
 
-#include "position_estimator_mc_params.h"
+typedef enum {
+	TECS_MODE_NORMAL,
+	TECS_MODE_UNDERSPEED,
+	TECS_MODE_TAKEOFF,
+	TECS_MODE_LAND,
+	TECS_MODE_LAND_THROTTLELIM
+} tecs_mode;
 
-/* Kalman Filter covariances */
-/* gps measurement noise standard deviation */
-PARAM_DEFINE_FLOAT(POS_EST_ADDN, 1.0f);
-PARAM_DEFINE_FLOAT(POS_EST_SIGMA, 0.0f);
-PARAM_DEFINE_FLOAT(POS_EST_R, 1.0f);
-PARAM_DEFINE_INT32(POS_EST_BARO, 0.0f);
+ /**
+ * Internal values of the (m)TECS fixed wing speed alnd altitude control system
+ */
+struct tecs_status_s {
+	uint64_t timestamp;		/**< timestamp, in microseconds since system start */
+
+	float altitudeSp;
+	float altitude;
+	float flightPathAngleSp;
+	float flightPathAngle;
+	float flightPathAngleFiltered;
+	float airspeedSp;
+	float airspeed;
+	float airspeedFiltered;
+	float airspeedDerivativeSp;
+	float airspeedDerivative;
+
+	float totalEnergyRateSp;
+	float totalEnergyRate;
+	float energyDistributionRateSp;
+	float energyDistributionRate;
+
+	tecs_mode mode;
+};
+
+/**
+ * @}
+ */
 
-int parameters_init(struct position_estimator_mc_param_handles *h)
-{
-	h->addNoise	= param_find("POS_EST_ADDN");
-	h->sigma = param_find("POS_EST_SIGMA");
-	h->r = param_find("POS_EST_R");
-	h->baro_param_handle = param_find("POS_EST_BARO");
-	return OK;
-}
+/* register this as object request broker structure */
+ORB_DECLARE(tecs_status);
 
-int parameters_update(const struct position_estimator_mc_param_handles *h, struct position_estimator_mc_params *p)
-{
-	param_get(h->addNoise, &(p->addNoise));
-	param_get(h->sigma, &(p->sigma));
-	param_get(h->r, &(p->R));
-	param_get(h->baro_param_handle, &(p->baro));
-	return OK;
-}
+#endif
diff --git a/src/modules/uORB/topics/telemetry_status.h b/src/modules/uORB/topics/telemetry_status.h
index 76693c46e..e9e00d76c 100644
--- a/src/modules/uORB/topics/telemetry_status.h
+++ b/src/modules/uORB/topics/telemetry_status.h
@@ -57,6 +57,7 @@ enum TELEMETRY_STATUS_RADIO_TYPE {
 
 struct telemetry_status_s {
 	uint64_t timestamp;
+	uint64_t heartbeat_time;	/**< Time of last received heartbeat from remote system */
 	enum TELEMETRY_STATUS_RADIO_TYPE type;	/**< type of the radio hardware     */
 	uint8_t rssi;				/**< local signal strength                      */
 	uint8_t remote_rssi;			/**< remote signal strength                     */
diff --git a/src/modules/uORB/topics/vehicle_attitude_setpoint.h b/src/modules/uORB/topics/vehicle_attitude_setpoint.h
index d526a8ff2..8446e9c6e 100644
--- a/src/modules/uORB/topics/vehicle_attitude_setpoint.h
+++ b/src/modules/uORB/topics/vehicle_attitude_setpoint.h
@@ -72,6 +72,8 @@ struct vehicle_attitude_setpoint_s {
 	float thrust;					/**< Thrust in Newton the power system should generate */
 
 	bool	roll_reset_integral;			/**< Reset roll integral part (navigation logic change) */
+	bool	pitch_reset_integral;			/**< Reset pitch integral part (navigation logic change) */
+	bool	yaw_reset_integral;			/**< Reset yaw integral part (navigation logic change) */
 
 };
 
diff --git a/src/modules/uORB/topics/vehicle_global_position.h b/src/modules/uORB/topics/vehicle_global_position.h
index adcd028f0..e32529cb4 100644
--- a/src/modules/uORB/topics/vehicle_global_position.h
+++ b/src/modules/uORB/topics/vehicle_global_position.h
@@ -36,7 +36,7 @@
  * Definition of the global fused WGS84 position uORB topic.
  *
  * @author Thomas Gubler <thomasgubler@student.ethz.ch>
- * @author Julian Oes <joes@student.ethz.ch>
+ * @author Julian Oes <julian@oes.ch>
  * @author Lorenz Meier <lm@inf.ethz.ch>
  */
 
@@ -61,21 +61,17 @@
  * e.g. control inputs of the vehicle in a Kalman-filter implementation.
  */
 struct vehicle_global_position_s {
-	uint64_t timestamp;		/**< Time of this estimate, in microseconds since system start */
-
-	bool global_valid;		/**< true if position satisfies validity criteria of estimator */
-	bool baro_valid;		/**< true if baro_alt is valid (vel_d is also valid in this case) */
-
-	uint64_t time_gps_usec; /**< GPS timestamp in microseconds					   */
+	uint64_t timestamp;		/**< Time of this estimate, in microseconds since system start		*/
+	uint64_t time_gps_usec;		/**< GPS timestamp in microseconds					   */
 	double lat;			/**< Latitude in degrees							 	   */
 	double lon;			/**< Longitude in degrees							 	   */
 	float alt;			/**< Altitude AMSL in meters						 	   */
-	float vel_n; 		/**< Ground north velocity, m/s				 			   */
-	float vel_e;		/**< Ground east velocity, m/s							   */
-	float vel_d;		/**< Ground downside velocity, m/s						   */
+	float vel_n; 			/**< Ground north velocity, m/s				 			   */
+	float vel_e;			/**< Ground east velocity, m/s							   */
+	float vel_d;			/**< Ground downside velocity, m/s						   */
 	float yaw; 			/**< Yaw in radians -PI..+PI.							   */
-
-	float baro_alt;		/**< Barometric altitude (not raw baro but fused with accelerometer) */
+	float eph;
+	float epv;
 };
 
 /**
diff --git a/src/modules/uORB/topics/vehicle_gps_position.h b/src/modules/uORB/topics/vehicle_gps_position.h
index 794c3f8bc..bbacb733a 100644
--- a/src/modules/uORB/topics/vehicle_gps_position.h
+++ b/src/modules/uORB/topics/vehicle_gps_position.h
@@ -65,8 +65,11 @@ struct vehicle_gps_position_s {
 	float c_variance_rad;				/**< course accuracy estimate rad */
 	uint8_t fix_type; 				/**< 0-1: no fix, 2: 2D fix, 3: 3D fix. Some applications will not use the value of this field unless it is at least two, so always correctly fill in the fix.   */
 
-	float eph_m;					/**< GPS HDOP horizontal dilution of position in m */
-	float epv_m;					/**< GPS VDOP horizontal dilution of position in m */
+	float eph;					/**< GPS HDOP horizontal dilution of position in m */
+	float epv;					/**< GPS VDOP horizontal dilution of position in m */
+
+	unsigned noise_per_ms;				/**< */
+	unsigned jamming_indicator;			/**< */
 
 	uint64_t timestamp_velocity;			/**< Timestamp for velocity informations */
 	float vel_m_s;					/**< GPS ground speed (m/s) */
@@ -85,7 +88,7 @@ struct vehicle_gps_position_s {
 	uint8_t satellite_used[20];			/**< 0: Satellite not used, 1: used for localization */
 	uint8_t satellite_elevation[20]; 		/**< Elevation (0: right on top of receiver, 90: on the horizon) of satellite */
 	uint8_t satellite_azimuth[20];			/**< Direction of satellite, 0: 0 deg, 255: 360 deg. */
-	uint8_t satellite_snr[20];			/**< Signal to noise ratio of satellite   */
+	uint8_t satellite_snr[20];			/**< dBHz, Signal to noise ratio of satellite C/N0, range 0..99, zero when not tracking this satellite. */
 	bool satellite_info_available;			/**< 0 for no info, 1 for info available */
 };
 
diff --git a/src/modules/uORB/topics/vehicle_local_position.h b/src/modules/uORB/topics/vehicle_local_position.h
index db9637cd9..5d39c897d 100644
--- a/src/modules/uORB/topics/vehicle_local_position.h
+++ b/src/modules/uORB/topics/vehicle_local_position.h
@@ -1,7 +1,6 @@
 /****************************************************************************
  *
  *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: @author Lorenz Meier <lm@inf.ethz.ch>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -35,6 +34,9 @@
 /**
  * @file vehicle_local_position.h
  * Definition of the local fused NED position uORB topic.
+ *
+ * @author Lorenz Meier <lm@inf.ethz.ch>
+ * @author Anton Babushkin <anton.babushkin@me.com>
  */
 
 #ifndef TOPIC_VEHICLE_LOCAL_POSITION_H_
@@ -72,8 +74,8 @@ struct vehicle_local_position_s {
 	bool xy_global;			/**< true if position (x, y) is valid and has valid global reference (ref_lat, ref_lon) */
 	bool z_global;			/**< true if z is valid and has valid global reference (ref_alt) */
 	uint64_t ref_timestamp;	/**< Time when reference position was set */
-	int32_t ref_lat;		/**< Reference point latitude in 1E7 degrees */
-	int32_t ref_lon;		/**< Reference point longitude in 1E7 degrees */
+	double ref_lat;		/**< Reference point latitude in degrees */
+	double ref_lon;		/**< Reference point longitude in degrees */
 	float ref_alt;			/**< Reference altitude AMSL in meters, MUST be set to current (not at reference point!) ground level */
 	bool landed;			/**< true if vehicle is landed */
 	/* Distance to surface */
@@ -81,6 +83,8 @@ struct vehicle_local_position_s {
 	float dist_bottom_rate;		/**< Distance to bottom surface (ground) change rate */
 	uint64_t surface_bottom_timestamp;		/**< Time when new bottom surface found */
 	bool dist_bottom_valid;	/**< true if distance to bottom surface is valid */
+	float eph;
+	float epv;
 };
 
 /**
diff --git a/src/modules/uORB/topics/vehicle_status.h b/src/modules/uORB/topics/vehicle_status.h
index 56be4d241..56590047f 100644
--- a/src/modules/uORB/topics/vehicle_status.h
+++ b/src/modules/uORB/topics/vehicle_status.h
@@ -1,10 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: @author Lorenz Meier <lm@inf.ethz.ch>
- *           @author Petri Tanskanen <petri.tanskanen@inf.ethz.ch>
- *           @author Thomas Gubler <thomasgubler@student.ethz.ch>
- *           @author Julian Oes <joes@student.ethz.ch>
+ *   Copyright (C) 2012 - 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -45,6 +41,11 @@
  * All apps should write to subsystem_info:
  *
  *  (any app) --> subsystem_info (published) --> (commander app state machine)  --> vehicle_status --> (mavlink app)
+ *
+ * @author Lorenz Meier <lm@inf.ethz.ch>
+ * @author Petri Tanskanen <petri.tanskanen@inf.ethz.ch>
+ * @author Thomas Gubler <thomasgubler@student.ethz.ch>
+ * @author Julian Oes <julian@oes.ch>
  */
 
 #ifndef VEHICLE_STATUS_H_
@@ -54,21 +55,26 @@
 #include <stdbool.h>
 #include "../uORB.h"
 
-#include <navigator/navigator_state.h>
-
 /**
  * @addtogroup topics @{
  */
 
-/* main state machine */
+/**
+ * Main state, i.e. what user wants. Controlled by RC or from ground station via telemetry link.
+ */
 typedef enum {
 	MAIN_STATE_MANUAL = 0,
-	MAIN_STATE_SEATBELT,
-	MAIN_STATE_EASY,
-	MAIN_STATE_AUTO,
-	MAIN_STATE_MAX
+	MAIN_STATE_ALTCTL,
+	MAIN_STATE_POSCTL,
+	MAIN_STATE_AUTO_MISSION,
+	MAIN_STATE_AUTO_LOITER,
+	MAIN_STATE_AUTO_RTL,
+	MAIN_STATE_ACRO,
+	MAIN_STATE_MAX,
 } main_state_t;
 
+// If you change the order, add or remove arming_state_t states make sure to update the arrays
+// in state_machine_helper.cpp as well.
 typedef enum {
 	ARMING_STATE_INIT = 0,
 	ARMING_STATE_STANDBY,
@@ -77,7 +83,7 @@ typedef enum {
 	ARMING_STATE_STANDBY_ERROR,
 	ARMING_STATE_REBOOT,
 	ARMING_STATE_IN_AIR_RESTORE,
-	ARMING_STATE_MAX
+	ARMING_STATE_MAX,
 } arming_state_t;
 
 typedef enum {
@@ -85,36 +91,23 @@ typedef enum {
 	HIL_STATE_ON
 } hil_state_t;
 
+/**
+ * Navigation state, i.e. "what should vehicle do".
+ */
 typedef enum {
-	FAILSAFE_STATE_NORMAL = 0,		/**< Normal operation */
-	FAILSAFE_STATE_RTL,				/**< Return To Launch */
-	FAILSAFE_STATE_LAND,			/**< Land without position control */
-	FAILSAFE_STATE_TERMINATION,		/**< Disable motors and use parachute, can't be recovered */
-	FAILSAFE_STATE_MAX
-} failsafe_state_t;
-
-typedef enum {
-	MODE_SWITCH_MANUAL = 0,
-	MODE_SWITCH_ASSISTED,
-	MODE_SWITCH_AUTO
-} mode_switch_pos_t;
-
-typedef enum {
-	ASSISTED_SWITCH_SEATBELT = 0,
-	ASSISTED_SWITCH_EASY
-} assisted_switch_pos_t;
-
-typedef enum {
-	RETURN_SWITCH_NONE = 0,
-	RETURN_SWITCH_NORMAL,
-	RETURN_SWITCH_RETURN
-} return_switch_pos_t;
-
-typedef enum {
-	MISSION_SWITCH_NONE = 0,
-	MISSION_SWITCH_LOITER,
-	MISSION_SWITCH_MISSION
-} mission_switch_pos_t;
+	NAVIGATION_STATE_MANUAL = 0,		/**< Manual mode */
+	NAVIGATION_STATE_ALTCTL,		/**< Altitude control mode */
+	NAVIGATION_STATE_POSCTL,		/**< Position control mode */
+	NAVIGATION_STATE_AUTO_MISSION,		/**< Auto mission mode */
+	NAVIGATION_STATE_AUTO_LOITER,		/**< Auto loiter mode */
+	NAVIGATION_STATE_AUTO_RTL,		/**< Auto return to launch mode */
+	NAVIGATION_STATE_AUTO_RTGS,		/**< Auto return to groundstation on data link loss */
+	NAVIGATION_STATE_ACRO,			/**< Acro mode */
+	NAVIGATION_STATE_LAND,			/**< Land mode */
+	NAVIGATION_STATE_DESCEND,			/**< Descend mode (no position control) */
+	NAVIGATION_STATE_TERMINATION,		/**< Termination mode */
+	NAVIGATION_STATE_MAX,
+} navigation_state_t;
 
 enum VEHICLE_MODE_FLAG {
 	VEHICLE_MODE_FLAG_SAFETY_ARMED = 128,
@@ -174,12 +167,11 @@ struct vehicle_status_s {
 	uint16_t counter;   /**< incremented by the writing thread everytime new data is stored */
 	uint64_t timestamp; /**< in microseconds since system start, is set whenever the writing thread stores new data */
 
-	main_state_t main_state;				/**< main state machine */
-	unsigned int set_nav_state;	/**< set navigation state machine to specified value */
-	uint64_t set_nav_state_timestamp;	/**< timestamp of latest change of set_nav_state */
+	main_state_t main_state;		    	/**< main state machine */
+	navigation_state_t nav_state;		/**< set navigation state machine to specified value */
 	arming_state_t arming_state;			/**< current arming state */
-	hil_state_t hil_state;					/**< current hil state */
-	failsafe_state_t failsafe_state;		/**< current failsafe state */
+	hil_state_t hil_state;				/**< current hil state */
+	bool failsafe;					/**< true if system is in failsafe state */
 
 	int32_t system_type;				/**< system type, inspired by MAVLink's VEHICLE_TYPE enum */
 	int32_t	system_id;				/**< system id, inspired by MAVLink's system ID field */
@@ -187,11 +179,6 @@ struct vehicle_status_s {
 
 	bool is_rotary_wing;
 
-	mode_switch_pos_t mode_switch;
-	return_switch_pos_t return_switch;
-	assisted_switch_pos_t assisted_switch;
-	mission_switch_pos_t mission_switch;
-
 	bool condition_battery_voltage_valid;
 	bool condition_system_in_air_restore;	/**< true if we can restore in mid air */
 	bool condition_system_sensors_initialized;
@@ -204,11 +191,15 @@ struct vehicle_status_s {
 	bool condition_local_altitude_valid;
 	bool condition_airspeed_valid;			/**< set to true by the commander app if there is a valid airspeed measurement available */
 	bool condition_landed;					/**< true if vehicle is landed, always true if disarmed */
+	bool condition_power_input_valid;		/**< set if input power is valid */
+	float avionics_power_rail_voltage;		/**< voltage of the avionics power rail */
 
 	bool rc_signal_found_once;
 	bool rc_signal_lost;				/**< true if RC reception lost */
 	bool rc_input_blocked;				/**< set if RC input should be ignored */
 
+	bool data_link_lost;						/**< datalink to GCS lost */
+
 	bool offboard_control_signal_found_once;
 	bool offboard_control_signal_lost;
 	bool offboard_control_signal_weak;
@@ -231,6 +222,8 @@ struct vehicle_status_s {
 	uint16_t errors_count2;
 	uint16_t errors_count3;
 	uint16_t errors_count4;
+
+	bool circuit_breaker_engaged_power_check;
 };
 
 /**
diff --git a/src/modules/uORB/topics/wind_estimate.h b/src/modules/uORB/topics/wind_estimate.h
new file mode 100644
index 000000000..58333a64f
--- /dev/null
+++ b/src/modules/uORB/topics/wind_estimate.h
@@ -0,0 +1,68 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file wind_estimate.h
+ *
+ * Wind estimate topic topic
+ *
+ */
+
+#ifndef TOPIC_WIND_ESTIMATE_H
+#define TOPIC_WIND_ESTIMATE_H
+
+#include <stdint.h>
+#include "../uORB.h"
+
+/**
+ * @addtogroup topics
+ * @{
+ */
+
+/** Wind estimate */
+struct wind_estimate_s {
+
+	uint64_t	timestamp;		/**< Microseconds since system boot */
+	float		windspeed_north;	/**< Wind component in north / X direction */
+	float		windspeed_east;		/**< Wind component in east / Y direction */
+	float		covariance_north;	/**< Uncertainty - set to zero (no uncertainty) if not estimated */
+	float		covariance_east;	/**< Uncertainty - set to zero (no uncertainty) if not estimated */
+};
+
+/**
+ * @}
+ */
+
+ORB_DECLARE(wind_estimate);
+
+#endif
\ No newline at end of file
diff --git a/src/modules/unit_test/unit_test.cpp b/src/modules/unit_test/unit_test.cpp
index 64ee544a2..02d1af481 100644
--- a/src/modules/unit_test/unit_test.cpp
+++ b/src/modules/unit_test/unit_test.cpp
@@ -32,17 +32,10 @@
  *
  ****************************************************************************/
 
-/**
- * @file unit_test.cpp
- * A unit test library.
- *
- */
-
 #include "unit_test.h"
 
 #include <systemlib/err.h>
 
-
 UnitTest::UnitTest()
 {
 }
@@ -51,15 +44,15 @@ UnitTest::~UnitTest()
 {
 }
 
-void
-UnitTest::print_results(const char* result)
+void UnitTest::printResults(void)
+{
+    warnx(mu_tests_failed() ? "SOME TESTS FAILED" : "ALL TESTS PASSED");
+    warnx("  Tests passed : %d", mu_tests_passed());
+    warnx("  Tests failed : %d", mu_tests_failed());
+    warnx("  Assertions : %d", mu_assertion());
+}
+
+void UnitTest::printAssert(const char* msg, const char* test, const char* file, int line)
 {
-	if (result != 0) {
-        	warnx("Failed: %s:%d", mu_last_test(), mu_line());
-        	warnx("%s", result);
-    	} else {
-        	warnx("ALL TESTS PASSED");
-        	warnx("  Tests run : %d", mu_tests_run());
-        	warnx("  Assertion : %d", mu_assertion());
-    	}
+    warnx("Assertion failed: %s - %s (%s:%d)", msg, test, file, line);
 }
diff --git a/src/modules/unit_test/unit_test.h b/src/modules/unit_test/unit_test.h
index 3020734f4..32eb8c308 100644
--- a/src/modules/unit_test/unit_test.h
+++ b/src/modules/unit_test/unit_test.h
@@ -32,62 +32,55 @@
  *
  ****************************************************************************/
 
-/**
- * @file unit_test.h
- * A unit test library based on MinUnit (http://www.jera.com/techinfo/jtns/jtn002.html).
- *
- */
-
 #ifndef UNIT_TEST_H_
-#define UNIT_TEST_
+#define UNIT_TEST_H_
 
 #include <systemlib/err.h>
 
-
 class __EXPORT UnitTest
 {
 
 public:
-#define xstr(s) str(s)
-#define str(s) #s
 #define INLINE_GLOBAL(type,func) inline type& func() { static type x; return x; }
 
 INLINE_GLOBAL(int, mu_tests_run)
+INLINE_GLOBAL(int, mu_tests_failed)
+INLINE_GLOBAL(int, mu_tests_passed)
 INLINE_GLOBAL(int, mu_assertion)
 INLINE_GLOBAL(int, mu_line)
 INLINE_GLOBAL(const char*, mu_last_test)
 
-#define mu_assert(message, test)                                           \
-    do                                                                     \
-    {                                                                      \
-        if (!(test))                                                       \
-            return __FILE__ ":" xstr(__LINE__) " " message " (" #test ")"; \
-        else                                                               \
-            mu_assertion()++;                                              \
-    } while (0)
-
-
-#define mu_run_test(test)                                                  \
-do                                                                         \
-{                                                                          \
-    const char *message;                                                   \
-    mu_last_test() = #test;                                                \
-    mu_line() = __LINE__;                                                  \
-    message = test();                                                      \
-    mu_tests_run()++;                                                      \
-    if (message)                                                           \
-        return message;                                                    \
-} while (0)
-
-
-public:
 	UnitTest();
     virtual ~UnitTest();
 
-    virtual const char*     run_tests() = 0;
-    virtual void            print_results(const char* result);
-};
-
+    virtual void runTests(void) = 0;
+    void printResults(void);
+    
+    void printAssert(const char* msg, const char* test, const char* file, int line);
+    
+#define ut_assert(message, test)                                \
+    do {                                                        \
+        if (!(test)) {                                          \
+            printAssert(message, #test, __FILE__, __LINE__);    \
+            return false;                                       \
+        } else {                                                \
+            mu_assertion()++;                                   \
+        }                                                       \
+    } while (0)
+    
+#define ut_run_test(test)                       \
+    do {                                        \
+        warnx("RUNNING TEST: %s", #test);       \
+        mu_tests_run()++;                       \
+        if (!test()) {                          \
+            warnx("TEST FAILED: %s", #test);    \
+            mu_tests_failed()++;                \
+        } else {                                \
+            warnx("TEST PASSED: %s", #test);    \
+            mu_tests_passed()++;                \
+        }                                       \
+    } while (0)
 
+};
 
 #endif /* UNIT_TEST_H_ */
diff --git a/src/systemcmds/config/config.c b/src/systemcmds/config/config.c
index 476015f3e..4a97d328c 100644
--- a/src/systemcmds/config/config.c
+++ b/src/systemcmds/config/config.c
@@ -1,8 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved.
- *   Author: Lorenz Meier <lm@inf.ethz.ch>
- *   Author: Julian Oes <joes@student.ethz.ch>
+ *   Copyright (c) 2012-2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -94,7 +92,6 @@ do_device(int argc, char *argv[])
 	}
 
 	int	fd;
-	int	ret;
 
 	fd = open(argv[0], 0);
 
@@ -104,6 +101,8 @@ do_device(int argc, char *argv[])
 
 	} else {
 
+		int	ret;
+
 		if (argc == 2 && !strcmp(argv[1], "block")) {
 
 			/* disable the device publications */
@@ -121,7 +120,7 @@ do_device(int argc, char *argv[])
 				errx(ret,"uORB publications could not be unblocked");
 
 		} else {
-			errx("no valid command: %s", argv[1]);
+			errx(1, "no valid command: %s", argv[1]);
 		}
 	}
 
@@ -132,7 +131,6 @@ static void
 do_gyro(int argc, char *argv[])
 {
 	int	fd;
-	int	ret;
 
 	fd = open(GYRO_DEVICE_PATH, 0);
 
@@ -142,6 +140,8 @@ do_gyro(int argc, char *argv[])
 
 	} else {
 
+		int ret;
+
 		if (argc == 2 && !strcmp(argv[0], "sampling")) {
 
 			/* set the gyro internal sampling rate up to at least i Hz */
@@ -173,8 +173,13 @@ do_gyro(int argc, char *argv[])
 				warnx("gyro self test FAILED! Check calibration:");
 				struct gyro_scale scale;
 				ret = ioctl(fd, GYROIOCGSCALE, (long unsigned int)&scale);
-				warnx("offsets: X: % 9.6f Y: % 9.6f Z: % 9.6f", scale.x_offset, scale.y_offset, scale.z_offset);
-				warnx("scale:   X: % 9.6f Y: % 9.6f Z: % 9.6f", scale.x_scale, scale.y_scale, scale.z_scale);
+
+				if (ret) {
+					err(1, "failed getting gyro scale");
+				}
+
+				warnx("offsets: X: % 9.6f Y: % 9.6f Z: % 9.6f", (double)scale.x_offset, (double)scale.y_offset, (double)scale.z_offset);
+				warnx("scale:   X: % 9.6f Y: % 9.6f Z: % 9.6f", (double)scale.x_scale, (double)scale.y_scale, (double)scale.z_scale);
 			} else {
 				warnx("gyro calibration and self test OK");
 			}
@@ -199,7 +204,6 @@ static void
 do_mag(int argc, char *argv[])
 {
 	int fd;
-	int ret;
 
 	fd = open(MAG_DEVICE_PATH, 0);
 
@@ -209,6 +213,8 @@ do_mag(int argc, char *argv[])
 
 	} else {
 
+		int ret;
+
 		if (argc == 2 && !strcmp(argv[0], "sampling")) {
 
 			/* set the mag internal sampling rate up to at least i Hz */
@@ -240,8 +246,13 @@ do_mag(int argc, char *argv[])
 				warnx("mag self test FAILED! Check calibration:");
 				struct mag_scale scale;
 				ret = ioctl(fd, MAGIOCGSCALE, (long unsigned int)&scale);
-				warnx("offsets: X: % 9.6f Y: % 9.6f Z: % 9.6f", scale.x_offset, scale.y_offset, scale.z_offset);
-				warnx("scale:   X: % 9.6f Y: % 9.6f Z: % 9.6f", scale.x_scale, scale.y_scale, scale.z_scale);
+
+				if (ret) {
+					err(ret, "failed getting mag scale");
+				}
+
+				warnx("offsets: X: % 9.6f Y: % 9.6f Z: % 9.6f", (double)scale.x_offset, (double)scale.y_offset, (double)scale.z_offset);
+				warnx("scale:   X: % 9.6f Y: % 9.6f Z: % 9.6f", (double)scale.x_scale, (double)scale.y_scale, (double)scale.z_scale);
 			} else {
 				warnx("mag calibration and self test OK");
 			}
@@ -266,7 +277,6 @@ static void
 do_accel(int argc, char *argv[])
 {
 	int	fd;
-	int	ret;
 
 	fd = open(ACCEL_DEVICE_PATH, 0);
 
@@ -276,6 +286,8 @@ do_accel(int argc, char *argv[])
 
 	} else {
 
+		int ret;
+
 		if (argc == 2 && !strcmp(argv[0], "sampling")) {
 
 			/* set the accel internal sampling rate up to at least i Hz */
@@ -307,8 +319,13 @@ do_accel(int argc, char *argv[])
 				warnx("accel self test FAILED! Check calibration:");
 				struct accel_scale scale;
 				ret = ioctl(fd, ACCELIOCGSCALE, (long unsigned int)&scale);
-				warnx("offsets: X: % 9.6f Y: % 9.6f Z: % 9.6f", scale.x_offset, scale.y_offset, scale.z_offset);
-				warnx("scale:   X: % 9.6f Y: % 9.6f Z: % 9.6f", scale.x_scale, scale.y_scale, scale.z_scale);
+
+				if (ret) {
+					err(ret, "failed getting accel scale");
+				}
+
+				warnx("offsets: X: % 9.6f Y: % 9.6f Z: % 9.6f", (double)scale.x_offset, (double)scale.y_offset, (double)scale.z_offset);
+				warnx("scale:   X: % 9.6f Y: % 9.6f Z: % 9.6f", (double)scale.x_scale, (double)scale.y_scale, (double)scale.z_scale);
 			} else {
 				warnx("accel calibration and self test OK");
 			}
diff --git a/src/systemcmds/esc_calib/esc_calib.c b/src/systemcmds/esc_calib/esc_calib.c
index ad1996694..7d80af307 100644
--- a/src/systemcmds/esc_calib/esc_calib.c
+++ b/src/systemcmds/esc_calib/esc_calib.c
@@ -182,7 +182,7 @@ esc_calib_main(int argc, char *argv[])
 
 	if (orb_updated) {
 		errx(1, "ABORTING! Attitude control still active. Please ensure to shut down all controllers:\n"
-			"\tmultirotor_att_control stop\n"
+			"\tmc_att_control stop\n"
 			"\tfw_att_control stop\n");
 	}
 
diff --git a/src/systemcmds/mtd/24xxxx_mtd.c b/src/systemcmds/mtd/24xxxx_mtd.c
index e34be44e3..72200f418 100644
--- a/src/systemcmds/mtd/24xxxx_mtd.c
+++ b/src/systemcmds/mtd/24xxxx_mtd.c
@@ -142,12 +142,9 @@ struct at24c_dev_s {
 	uint16_t              pagesize; /* 32, 63 */
 	uint16_t              npages;   /* 128, 256, 512, 1024 */
 
-	perf_counter_t        perf_reads;
-	perf_counter_t        perf_writes;
-	perf_counter_t        perf_resets;
-	perf_counter_t        perf_read_retries;
-	perf_counter_t        perf_read_errors;
-	perf_counter_t        perf_write_errors;
+	perf_counter_t        perf_transfers;
+	perf_counter_t        perf_resets_retries;
+	perf_counter_t        perf_errors;
 };
 
 /************************************************************************************
@@ -240,8 +237,10 @@ void at24c_test(void)
 		} else if (result != 1) {
 			vdbg("unexpected %u\n", result);
 		}
-		if ((count % 100) == 0)
+
+		if ((count % 100) == 0) {
 			vdbg("test %u errors %u\n", count, errors);
+		}
 	}
 }
 
@@ -298,9 +297,9 @@ static ssize_t at24c_bread(FAR struct mtd_dev_s *dev, off_t startblock,
 
 		for (;;) {
 
-			perf_begin(priv->perf_reads);
+			perf_begin(priv->perf_transfers);
 			ret = I2C_TRANSFER(priv->dev, &msgv[0], 2);
-			perf_end(priv->perf_reads);
+			perf_end(priv->perf_transfers);
 
 			if (ret >= 0)
 				break;
@@ -314,10 +313,10 @@ static ssize_t at24c_bread(FAR struct mtd_dev_s *dev, off_t startblock,
 			 * XXX maybe do special first-read handling with optional
 			 * bus reset as well?
 			 */
-			perf_count(priv->perf_read_retries);
+			perf_count(priv->perf_resets_retries);
 
 			if (--tries == 0) {
-				perf_count(priv->perf_read_errors);
+				perf_count(priv->perf_errors);
 				return ERROR;
 			}
 		}
@@ -383,9 +382,9 @@ static ssize_t at24c_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t
 
 		for (;;) {
 
-			perf_begin(priv->perf_writes);
+			perf_begin(priv->perf_transfers);
 			ret = I2C_TRANSFER(priv->dev, &msgv[0], 1);
-			perf_end(priv->perf_writes);
+			perf_end(priv->perf_transfers);
 
 			if (ret >= 0)
 				break;
@@ -397,7 +396,7 @@ static ssize_t at24c_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t
 			 * poll for write completion.
 			 */
 			if (--tries == 0) {
-				perf_count(priv->perf_write_errors);
+				perf_count(priv->perf_errors);
 				return ERROR;
 			}
 		}
@@ -521,12 +520,9 @@ FAR struct mtd_dev_s *at24c_initialize(FAR struct i2c_dev_s *dev) {
 		priv->mtd.ioctl  = at24c_ioctl;
 		priv->dev        = dev;
 
-		priv->perf_reads = perf_alloc(PC_ELAPSED, "EEPROM read");
-		priv->perf_writes = perf_alloc(PC_ELAPSED, "EEPROM write");
-		priv->perf_resets = perf_alloc(PC_COUNT, "EEPROM reset");
-		priv->perf_read_retries = perf_alloc(PC_COUNT, "EEPROM read retries");
-		priv->perf_read_errors = perf_alloc(PC_COUNT, "EEPROM read errors");
-		priv->perf_write_errors = perf_alloc(PC_COUNT, "EEPROM write errors");
+		priv->perf_transfers = perf_alloc(PC_ELAPSED, "eeprom_trans");
+		priv->perf_resets_retries = perf_alloc(PC_COUNT, "eeprom_rst");
+		priv->perf_errors = perf_alloc(PC_COUNT, "eeprom_errs");
 	}
 
 	/* attempt to read to validate device is present */
@@ -548,9 +544,9 @@ FAR struct mtd_dev_s *at24c_initialize(FAR struct i2c_dev_s *dev) {
 		}
 	};
 
-	perf_begin(priv->perf_reads);
+	perf_begin(priv->perf_transfers);
 	int ret = I2C_TRANSFER(priv->dev, &msgv[0], 2);
-	perf_end(priv->perf_reads);
+	perf_end(priv->perf_transfers);
 
 	if (ret < 0) {
 		return NULL;
diff --git a/src/systemcmds/mtd/mtd.c b/src/systemcmds/mtd/mtd.c
index 0a88d40f3..a925cdd40 100644
--- a/src/systemcmds/mtd/mtd.c
+++ b/src/systemcmds/mtd/mtd.c
@@ -91,7 +91,7 @@ static void	mtd_test(void);
 static void	mtd_erase(char *partition_names[], unsigned n_partitions);
 static void	mtd_readtest(char *partition_names[], unsigned n_partitions);
 static void	mtd_rwtest(char *partition_names[], unsigned n_partitions);
-static void	mtd_print_info();
+static void	mtd_print_info(void);
 static int	mtd_get_geometry(unsigned long *blocksize, unsigned long *erasesize, unsigned long *neraseblocks, 
 	unsigned *blkpererase, unsigned *nblocks, unsigned *partsize, unsigned n_partitions);
 
@@ -104,6 +104,16 @@ static unsigned n_partitions_current = 0;
 static char *partition_names_default[] = {"/fs/mtd_params", "/fs/mtd_waypoints"};
 static const int n_partitions_default = sizeof(partition_names_default) / sizeof(partition_names_default[0]);
 
+static void
+mtd_status(void)
+{
+	if (!attached)
+		errx(1, "MTD driver not started");
+    
+	mtd_print_info();
+	exit(0);
+}
+
 int mtd_main(int argc, char *argv[])
 {
 	if (argc >= 2) {
@@ -160,7 +170,11 @@ static void
 ramtron_attach(void)
 {
 	/* find the right spi */
+#ifdef CONFIG_ARCH_BOARD_AEROCORE
+	struct spi_dev_s *spi = up_spiinitialize(4);
+#else
 	struct spi_dev_s *spi = up_spiinitialize(2);
+#endif
 	/* this resets the spi bus, set correct bus speed again */
 	SPI_SETFREQUENCY(spi, 10 * 1000 * 1000);
 	SPI_SETBITS(spi, 8);
@@ -189,8 +203,12 @@ ramtron_attach(void)
 		errx(1, "failed to initialize mtd driver");
 
 	int ret = mtd_dev->ioctl(mtd_dev, MTDIOC_SETSPEED, (unsigned long)10*1000*1000);
-        if (ret != OK)
-            warnx(1, "failed to set bus speed");
+	if (ret != OK) {
+		// FIXME: From the previous warnx call, it looked like this should have been an errx instead. Tried
+		// that but setting the bug speed does fail all the time. Which was then exiting and the board would
+		// not run correctly. So changed to warnx.
+		warnx("failed to set bus speed");
+	}
 
 	attached = true;
 }
@@ -347,7 +365,7 @@ static ssize_t mtd_get_partition_size(void)
 	return partsize;
 }
 
-void mtd_print_info()
+void mtd_print_info(void)
 {
 	if (!attached)
 		exit(1);
@@ -378,16 +396,6 @@ mtd_test(void)
 }
 
 void
-mtd_status(void)
-{
-	if (!attached)
-		errx(1, "MTD driver not started");
-
-	mtd_print_info();
-	exit(0);
-}
-
-void
 mtd_erase(char *partition_names[], unsigned n_partitions)
 {
 	uint8_t v[64];
@@ -420,7 +428,7 @@ mtd_readtest(char *partition_names[], unsigned n_partitions)
 
 	uint8_t v[128];
 	for (uint8_t i = 0; i < n_partitions; i++) {
-		uint32_t count = 0;
+		ssize_t count = 0;
 		printf("reading %s expecting %u bytes\n", partition_names[i], expected_size);
 		int fd = open(partition_names[i], O_RDONLY);
 		if (fd == -1) {
@@ -451,8 +459,8 @@ mtd_rwtest(char *partition_names[], unsigned n_partitions)
 
 	uint8_t v[128], v2[128];
 	for (uint8_t i = 0; i < n_partitions; i++) {
-		uint32_t count = 0;
-                off_t offset = 0;
+		ssize_t count = 0;
+        off_t offset = 0;
 		printf("rwtest %s testing %u bytes\n", partition_names[i], expected_size);
 		int fd = open(partition_names[i], O_RDWR);
 		if (fd == -1) {
diff --git a/src/systemcmds/nshterm/module.mk b/src/systemcmds/nshterm/module.mk
index a48588535..b22b446da 100644
--- a/src/systemcmds/nshterm/module.mk
+++ b/src/systemcmds/nshterm/module.mk
@@ -38,4 +38,4 @@
 MODULE_COMMAND	 = nshterm
 SRCS		 = nshterm.c
 
-MODULE_STACKSIZE = 3000
+MODULE_STACKSIZE = 1200
diff --git a/src/systemcmds/nshterm/nshterm.c b/src/systemcmds/nshterm/nshterm.c
index 7d9484d3e..fca1798e6 100644
--- a/src/systemcmds/nshterm/nshterm.c
+++ b/src/systemcmds/nshterm/nshterm.c
@@ -60,7 +60,7 @@ nshterm_main(int argc, char *argv[])
         printf("Usage: nshterm <device>\n");
         exit(1);
     }
-    uint8_t retries = 0;
+    unsigned retries = 0;
     int fd = -1;
 
     /* try the first 30 seconds */
diff --git a/src/systemcmds/param/module.mk b/src/systemcmds/param/module.mk
index 63f15ad28..f716eb71e 100644
--- a/src/systemcmds/param/module.mk
+++ b/src/systemcmds/param/module.mk
@@ -38,7 +38,8 @@
 MODULE_COMMAND	 = param
 SRCS		 = param.c
 
-MODULE_STACKSIZE = 4096
+# Note: measurements yielded a max of 900 bytes used.
+MODULE_STACKSIZE = 1800
 
 MAXOPTIMIZATION	 = -Os
 
diff --git a/src/systemcmds/param/param.c b/src/systemcmds/param/param.c
index 0cbba0a37..328205e29 100644
--- a/src/systemcmds/param/param.c
+++ b/src/systemcmds/param/param.c
@@ -61,8 +61,9 @@ static void	do_load(const char* param_file_name);
 static void	do_import(const char* param_file_name);
 static void	do_show(const char* search_string);
 static void	do_show_print(void *arg, param_t param);
-static void	do_set(const char* name, const char* val);
+static void	do_set(const char* name, const char* val, bool fail_on_not_found);
 static void	do_compare(const char* name, const char* vals[], unsigned comparisons);
+static void	do_reset(void);
 
 int
 param_main(int argc, char *argv[])
@@ -116,10 +117,17 @@ param_main(int argc, char *argv[])
 		}
 
 		if (!strcmp(argv[1], "set")) {
-			if (argc >= 4) {
-				do_set(argv[2], argv[3]);
+			if (argc >= 5) {
+
+				/* if the fail switch is provided, fails the command if not found */
+				bool fail = !strcmp(argv[4], "fail");
+
+				do_set(argv[2], argv[3], fail);
+
+			} else if (argc >= 4) {
+				do_set(argv[2], argv[3], false);
 			} else {
-				errx(1, "not enough arguments.\nTry 'param set PARAM_NAME 3'");
+				errx(1, "not enough arguments.\nTry 'param set PARAM_NAME 3 [fail]'");
 			}
 		}
 
@@ -130,6 +138,10 @@ param_main(int argc, char *argv[])
 				errx(1, "not enough arguments.\nTry 'param compare PARAM_NAME 3'");
 			}
 		}
+
+		if (!strcmp(argv[1], "reset")) {
+			do_reset();
+		}
 	}
 	
 	errx(1, "expected a command, try 'load', 'import', 'show', 'set', 'compare', 'select' or 'save'");
@@ -277,7 +289,7 @@ do_show_print(void *arg, param_t param)
 }
 
 static void
-do_set(const char* name, const char* val)
+do_set(const char* name, const char* val, bool fail_on_not_found)
 {
 	int32_t i;
 	float f;
@@ -285,8 +297,8 @@ do_set(const char* name, const char* val)
 
 	/* set nothing if parameter cannot be found */
 	if (param == PARAM_INVALID) {
-		/* param not found */
-		errx(1, "Error: Parameter %s not found.", name);
+		/* param not found - fail silenty in scripts as it prevents booting */
+		errx(((fail_on_not_found) ? 1 : 0), "Error: Parameter %s not found.", name);
 	}
 
 	printf("%c %s: ",
@@ -402,3 +414,16 @@ do_compare(const char* name, const char* vals[], unsigned comparisons)
 
 	exit(ret);
 }
+
+static void
+do_reset(void)
+{
+	param_reset_all();
+
+	if (param_save_default()) {
+		warnx("Param export failed.");
+		exit(1);
+	} else {
+		exit(0);
+	}
+}
diff --git a/src/systemcmds/perf/module.mk b/src/systemcmds/perf/module.mk
index 77952842b..ec39a7a85 100644
--- a/src/systemcmds/perf/module.mk
+++ b/src/systemcmds/perf/module.mk
@@ -39,3 +39,5 @@ MODULE_COMMAND	 = perf
 SRCS		 = perf.c
 
 MAXOPTIMIZATION	 = -Os
+
+MODULE_STACKSIZE = 1800
diff --git a/src/systemcmds/perf/perf.c b/src/systemcmds/perf/perf.c
index b69ea597b..b08a2e3b7 100644
--- a/src/systemcmds/perf/perf.c
+++ b/src/systemcmds/perf/perf.c
@@ -73,7 +73,7 @@ int perf_main(int argc, char *argv[])
 		return -1;
 	}
 
-	perf_print_all();
+	perf_print_all(0 /* stdout */);
 	fflush(stdout);
 	return 0;
 }
diff --git a/src/systemcmds/preflight_check/module.mk b/src/systemcmds/preflight_check/module.mk
index 7c3c88783..0cb2a4cd0 100644
--- a/src/systemcmds/preflight_check/module.mk
+++ b/src/systemcmds/preflight_check/module.mk
@@ -40,3 +40,5 @@ MODULE_COMMAND	 = preflight_check
 SRCS		 = preflight_check.c
 
 MAXOPTIMIZATION	 = -Os
+
+MODULE_STACKSIZE = 1800
diff --git a/src/systemcmds/pwm/module.mk b/src/systemcmds/pwm/module.mk
index 4a23bba90..13a24150f 100644
--- a/src/systemcmds/pwm/module.mk
+++ b/src/systemcmds/pwm/module.mk
@@ -38,4 +38,4 @@
 MODULE_COMMAND	 = pwm
 SRCS		 = pwm.c
 
-MODULE_STACKSIZE = 4096
+MODULE_STACKSIZE = 1800
diff --git a/src/systemcmds/pwm/pwm.c b/src/systemcmds/pwm/pwm.c
index 7c23f38c2..e0e6ca537 100644
--- a/src/systemcmds/pwm/pwm.c
+++ b/src/systemcmds/pwm/pwm.c
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2013 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -443,6 +443,111 @@ pwm_main(int argc, char *argv[])
 					exit(0);
 				}
 			}
+			usleep(2000);
+		}
+		exit(0);
+
+
+	} else if (!strcmp(argv[1], "steps")) {
+
+		if (set_mask == 0) {
+			usage("no channels set");
+		}
+
+		/* get current servo values */
+		struct pwm_output_values last_spos;
+
+		for (unsigned i = 0; i < servo_count; i++) {
+
+			ret = ioctl(fd, PWM_SERVO_GET(i), (unsigned long)&last_spos.values[i]);
+			if (ret != OK)
+				err(1, "PWM_SERVO_GET(%d)", i);
+		}
+
+		/* perform PWM output */
+
+		/* Open console directly to grab CTRL-C signal */
+		struct pollfd fds;
+		fds.fd = 0; /* stdin */
+		fds.events = POLLIN;
+
+		warnx("Running 5 steps. WARNING! Motors will be live in 5 seconds\nPress any key to abort now.");
+		sleep(5);
+
+		unsigned off = 900;
+		unsigned idle = 1300;
+		unsigned full = 2000;
+		unsigned steps_timings_us[] = {2000, 5000, 20000, 50000};
+
+		unsigned phase = 0;
+		unsigned phase_counter = 0;
+		unsigned const phase_maxcount = 20;
+
+		for (	unsigned steps_timing_index = 0;
+			steps_timing_index < sizeof(steps_timings_us) / sizeof(steps_timings_us[0]);
+			steps_timing_index++ ) {
+
+			warnx("Sending step input with 0 to 100%% over a %u microseconds ramp", steps_timings_us[steps_timing_index]);
+
+			while (1) {
+				for (unsigned i = 0; i < servo_count; i++) {
+					if (set_mask & 1<<i) {
+
+						unsigned val;
+
+						if (phase == 0) {
+							val = idle;
+						} else if (phase == 1) {
+							/* ramp - depending how steep it is this ramp will look instantaneous on the output */
+							val = idle + (full - idle) * (phase_maxcount / (float)phase_counter);
+						} else {
+							val = off;
+						}
+
+						ret = ioctl(fd, PWM_SERVO_SET(i), val);
+						if (ret != OK)
+							err(1, "PWM_SERVO_SET(%d)", i);
+					}
+				}
+
+				/* abort on user request */
+				char c;
+				ret = poll(&fds, 1, 0);
+				if (ret > 0) {
+
+					ret = read(0, &c, 1);
+
+					if (ret > 0) {
+						/* reset output to the last value */
+						for (unsigned i = 0; i < servo_count; i++) {
+										if (set_mask & 1<<i) {
+											ret = ioctl(fd, PWM_SERVO_SET(i), last_spos.values[i]);
+											if (ret != OK)
+												err(1, "PWM_SERVO_SET(%d)", i);
+										}
+									}
+						warnx("Key pressed, user abort\n");
+						exit(0);
+					}
+				}
+				if (phase == 1) {
+					usleep(steps_timings_us[steps_timing_index] / phase_maxcount);
+
+				} else if (phase == 0) {
+					usleep(50000);
+				} else if (phase == 2) {
+					usleep(50000);
+				} else {
+					break;
+				}
+
+				phase_counter++;
+
+				if (phase_counter > phase_maxcount) {
+					phase++;
+					phase_counter = 0;
+				}
+			}
 		}
 		exit(0);
 
diff --git a/src/systemcmds/reboot/module.mk b/src/systemcmds/reboot/module.mk
index 19f64af54..edf9d8b37 100644
--- a/src/systemcmds/reboot/module.mk
+++ b/src/systemcmds/reboot/module.mk
@@ -39,3 +39,5 @@ MODULE_COMMAND	 = reboot
 SRCS		 = reboot.c
 
 MAXOPTIMIZATION	 = -Os
+
+MODULE_STACKSIZE = 800
diff --git a/src/systemcmds/tests/test_conv.cpp b/src/systemcmds/tests/test_conv.cpp
index 50dece816..fda949c61 100644
--- a/src/systemcmds/tests/test_conv.cpp
+++ b/src/systemcmds/tests/test_conv.cpp
@@ -65,7 +65,7 @@ int test_conv(int argc, char *argv[])
 		float f = i/10000.0f;
 		float fres = REG_TO_FLOAT(FLOAT_TO_REG(f));
 		if (fabsf(f - fres) > 0.0001f) {
-			warnx("conversion fail: input: %8.4f, intermediate: %d, result: %8.4f", f, REG_TO_SIGNED(FLOAT_TO_REG(f)), fres);
+			warnx("conversion fail: input: %8.4f, intermediate: %d, result: %8.4f", (double)f, REG_TO_SIGNED(FLOAT_TO_REG(f)), (double)fres);
 			return 1;
 		}
 	}
diff --git a/src/systemcmds/tests/test_file.c b/src/systemcmds/tests/test_file.c
index 96be1e8df..570583dee 100644
--- a/src/systemcmds/tests/test_file.c
+++ b/src/systemcmds/tests/test_file.c
@@ -102,7 +102,7 @@ test_file(int argc, char *argv[])
 	}
 
 	/* perform tests for a range of chunk sizes */
-	unsigned chunk_sizes[] = {1, 5, 8, 13, 16, 32, 33, 64, 70, 128, 133, 256, 300, 512, 555, 1024, 1500};
+	int chunk_sizes[] = {1, 5, 8, 13, 16, 32, 33, 64, 70, 128, 133, 256, 300, 512, 555, 1024, 1500};
 
 	for (unsigned c = 0; c < (sizeof(chunk_sizes) / sizeof(chunk_sizes[0])); c++) {
 
@@ -116,7 +116,7 @@ test_file(int argc, char *argv[])
 			uint8_t write_buf[chunk_sizes[c] + alignments] __attribute__((aligned(64)));
 
 			/* fill write buffer with known values */
-			for (int i = 0; i < sizeof(write_buf); i++) {
+			for (size_t i = 0; i < sizeof(write_buf); i++) {
 				/* this will wrap, but we just need a known value with spacing */
 				write_buf[i] = i+11;
 			}
@@ -149,6 +149,8 @@ test_file(int argc, char *argv[])
 			}
 			end = hrt_absolute_time();
 
+			warnx("write took %llu us", (end - start));
+
 			close(fd);
 			fd = open("/fs/microsd/testfile", O_RDONLY);
 
@@ -192,7 +194,6 @@ test_file(int argc, char *argv[])
 
 			warnx("testing aligned writes - please wait.. (CTRL^C to abort)");
 
-			start = hrt_absolute_time();
 			for (unsigned i = 0; i < iterations; i++) {
 				int wret = write(fd, write_buf, chunk_sizes[c]);
 
@@ -224,9 +225,6 @@ test_file(int argc, char *argv[])
 					return 1;
 				}
 				
-				/* compare value */
-				bool compare_ok = true;
-
 				for (int j = 0; j < chunk_sizes[c]; j++) {
 					if (read_buf[j] != write_buf[j]) {
 						warnx("COMPARISON ERROR: byte %d: %u != %u", j, (unsigned int)read_buf[j], (unsigned int)write_buf[j]);
diff --git a/src/systemcmds/tests/test_file2.c b/src/systemcmds/tests/test_file2.c
index ef555f6c3..8db3ea5ae 100644
--- a/src/systemcmds/tests/test_file2.c
+++ b/src/systemcmds/tests/test_file2.c
@@ -49,6 +49,8 @@
 #include <stdlib.h>
 #include <getopt.h>
 
+#include "tests.h"
+
 #define FLAG_FSYNC 1
 #define FLAG_LSEEK 2
 
@@ -85,9 +87,9 @@ static void test_corruption(const char *filename, uint32_t write_chunk, uint32_t
 		buffer[j] = get_value(ofs);
 		ofs++;
         }
-        if (write(fd, buffer, sizeof(buffer)) != sizeof(buffer)) {
-		printf("write failed at offset %u\n", ofs);
-		exit(1);
+        if (write(fd, buffer, sizeof(buffer)) != (int)sizeof(buffer)) {
+            printf("write failed at offset %u\n", ofs);
+            exit(1);
         }
 	if (flags & FLAG_FSYNC) {
 		fsync(fd);
@@ -116,7 +118,7 @@ static void test_corruption(const char *filename, uint32_t write_chunk, uint32_t
 			printf("read ofs=%u\r", ofs);
 		}
 		counter++;
-		if (read(fd, buffer, sizeof(buffer)) != sizeof(buffer)) {
+		if (read(fd, buffer, sizeof(buffer)) != (int)sizeof(buffer)) {
 			printf("read failed at offset %u\n", ofs);
 			exit(1);
 		}
diff --git a/src/systemcmds/tests/test_float.c b/src/systemcmds/tests/test_float.c
index 4921c9bbb..bb8b6c7f5 100644
--- a/src/systemcmds/tests/test_float.c
+++ b/src/systemcmds/tests/test_float.c
@@ -68,7 +68,7 @@ int test_float(int argc, char *argv[])
 	float sinf_one = sinf(1.0f);
 	float sqrt_two = sqrt(2.0f);
 
-	if (sinf_zero == 0.0f) {
+	if (fabsf(sinf_zero) < FLT_EPSILON) {
 		printf("\t success: sinf(0.0f) == 0.0f\n");
 
 	} else {
@@ -94,7 +94,7 @@ int test_float(int argc, char *argv[])
 		printf("\t success: asinf(1.0f) == 1.57079f\n");
 
 	} else {
-		printf("\t FAIL: asinf(1.0f) != 1.57079f, result: %f\n", asinf_one);
+		printf("\t FAIL: asinf(1.0f) != 1.57079f, result: %f\n", (double)asinf_one);
 		ret = -1;
 	}
 
@@ -128,7 +128,7 @@ int test_float(int argc, char *argv[])
 
 	float sinf_zero_one = sinf(0.1f);
 
-	if (fabs(sinf_zero_one - 0.0998334166f) < FLT_EPSILON) {
+	if (fabsf(sinf_zero_one - 0.0998334166f) < FLT_EPSILON) {
 		printf("\t success: sinf(0.1f) == 0.09983f\n");
 
 	} else {
@@ -136,7 +136,7 @@ int test_float(int argc, char *argv[])
 		ret = -2;
 	}
 
-	if (sqrt_two == 1.41421356f) {
+	if (fabsf(sqrt_two - 1.41421356f) < FLT_EPSILON) {
 		printf("\t success: sqrt(2.0f) == 1.41421f\n");
 
 	} else {
@@ -155,7 +155,7 @@ int test_float(int argc, char *argv[])
 	}
 
 	char sbuf[30];
-	sprintf(sbuf, "%8.4f", 0.553415f);
+	sprintf(sbuf, "%8.4f", (double)0.553415f);
 
 	if (sbuf[0] == ' ' && sbuf[1] == ' ' && sbuf[2] == '0' &&
 		sbuf[3] == '.' && sbuf[4] == '5' && sbuf[5] == '5'
@@ -166,7 +166,7 @@ int test_float(int argc, char *argv[])
 		ret = -5;
 	}
 
-	sprintf(sbuf, "%8.4f", -0.553415f);
+	sprintf(sbuf, "%8.4f", (double)-0.553415f);
 
 	if (sbuf[0] == ' ' && sbuf[1] == '-' && sbuf[2] == '0' &&
 		sbuf[3] == '.' && sbuf[4] == '5' && sbuf[5] == '5'
@@ -188,7 +188,7 @@ int test_float(int argc, char *argv[])
 
 	double d1d2 = d1 * d2;
 
-	if (d1d2 == 2.022200000000000219557705349871) {
+	if (fabs(d1d2 - 2.022200000000000219557705349871) < DBL_EPSILON) {
 		printf("\t success: 1.0111 * 2.0 == 2.0222\n");
 
 	} else {
@@ -201,11 +201,11 @@ int test_float(int argc, char *argv[])
 	// Assign value of f1 to d1
 	d1 = f1;
 
-	if (f1 == (float)d1) {
+	if (fabsf(f1 - (float)d1) < FLT_EPSILON) {
 		printf("\t success: (float) 1.55f == 1.55 (double)\n");
 
 	} else {
-		printf("\t FAIL: (float) 1.55f != 1.55 (double), result: %8.4f\n", f1);
+		printf("\t FAIL: (float) 1.55f != 1.55 (double), result: %8.4f\n", (double)f1);
 		ret = -8;
 	}
 
@@ -216,7 +216,7 @@ int test_float(int argc, char *argv[])
 	double sin_one = sin(1.0);
 	double atan2_ones = atan2(1.0, 1.0);
 
-	if (sin_zero == 0.0) {
+	if (fabs(sin_zero - 0.0) < DBL_EPSILON) {
 		printf("\t success: sin(0.0) == 0.0\n");
 
 	} else {
@@ -224,7 +224,7 @@ int test_float(int argc, char *argv[])
 		ret = -9;
 	}
 
-	if (sin_one == 0.841470984807896504875657228695) {
+	if (fabs(sin_one - 0.841470984807896504875657228695) < DBL_EPSILON) {
 		printf("\t success: sin(1.0) == 0.84147098480\n");
 
 	} else {
@@ -232,7 +232,7 @@ int test_float(int argc, char *argv[])
 		ret = -10;
 	}
 
-	if (atan2_ones != 0.785398) {
+	if (fabs(atan2_ones - 0.785398) < DBL_EPSILON) {
 		printf("\t success: atan2(1.0, 1.0) == 0.785398\n");
 
 	} else {
diff --git a/src/systemcmds/tests/test_mathlib.cpp b/src/systemcmds/tests/test_mathlib.cpp
index 693a208ba..00c649c75 100644
--- a/src/systemcmds/tests/test_mathlib.cpp
+++ b/src/systemcmds/tests/test_mathlib.cpp
@@ -52,10 +52,6 @@
 
 using namespace math;
 
-const char* formatResult(bool res) {
-	return res ? "OK" : "ERROR";
-}
-
 int test_mathlib(int argc, char *argv[])
 {
 	warnx("testing mathlib");
diff --git a/src/systemcmds/tests/test_mixer.cpp b/src/systemcmds/tests/test_mixer.cpp
index df382e2c6..8ab8fa2d6 100644
--- a/src/systemcmds/tests/test_mixer.cpp
+++ b/src/systemcmds/tests/test_mixer.cpp
@@ -81,7 +81,7 @@ int test_mixer(int argc, char *argv[])
 
 	warnx("testing mixer");
 
-	char *filename = "/etc/mixers/IO_pass.mix";
+	const char *filename = "/etc/mixers/IO_pass.mix";
 
 	if (argc > 1)
 		filename = argv[1];
@@ -100,8 +100,6 @@ int test_mixer(int argc, char *argv[])
 	 * e.g. on PX4IO.
 	 */
 
-	unsigned nused = 0;
-
 	const unsigned chunk_size = 64;
 
 	MixerGroup mixer_group(mixer_callback, 0);
@@ -124,7 +122,6 @@ int test_mixer(int argc, char *argv[])
 		return 1;
 
 	/* FIRST mark the mixer as invalid */
-	bool mixer_ok = false;
 	/* THEN actually delete it */
 	mixer_group.reset();
 	char mixer_text[256];		/* large enough for one mixer */
@@ -140,7 +137,6 @@ int test_mixer(int argc, char *argv[])
 
 		/* check for overflow - this would be really fatal */
 		if ((mixer_text_length + text_length + 1) > sizeof(mixer_text)) {
-			bool mixer_ok = false;
 			return 1;
 		}
 
@@ -156,15 +152,6 @@ int test_mixer(int argc, char *argv[])
 
 		/* if anything was parsed */
 		if (resid != mixer_text_length) {
-
-			/* only set mixer ok if no residual is left over */
-			if (resid == 0) {
-				mixer_ok = true;
-			} else {
-				/* not yet reached the end of the mixer, set as not ok */
-				mixer_ok = false;
-			}
-
 			warnx("used %u", mixer_text_length - resid);
 
 			/* copy any leftover text to the base of the buffer for re-use */
@@ -192,7 +179,7 @@ int test_mixer(int argc, char *argv[])
 	should_arm = true;
 
 	/* run through arming phase */
-	for (int i = 0; i < output_max; i++) {
+	for (unsigned i = 0; i < output_max; i++) {
 		actuator_controls[i] = 0.1f;
 		r_page_servo_disarmed[i] = PWM_LOWEST_MIN;
 		r_page_servo_control_min[i] = PWM_DEFAULT_MIN;
@@ -213,7 +200,7 @@ int test_mixer(int argc, char *argv[])
 		pwm_limit_calc(should_arm, mixed, r_page_servo_disarmed, r_page_servo_control_min, r_page_servo_control_max, outputs, r_page_servos, &pwm_limit);
 
 		//warnx("mixed %d outputs (max %d), values:", mixed, output_max);
-		for (int i = 0; i < mixed; i++)
+		for (unsigned i = 0; i < mixed; i++)
 		{
 			/* check mixed outputs to be zero during init phase */
 			if (hrt_elapsed_time(&starttime) < INIT_TIME_US &&
@@ -228,7 +215,7 @@ int test_mixer(int argc, char *argv[])
 				return 1;
 			}
 
-			//printf("\t %d: %8.4f limited: %8.4f, servo: %d\n", i, outputs_unlimited[i], outputs[i], (int)r_page_servos[i]);
+			//printf("\t %d: %8.4f limited: %8.4f, servo: %d\n", i, (double)outputs_unlimited[i], (double)outputs[i], (int)r_page_servos[i]);
 		}
 		usleep(sleep_quantum_us);
 		sleepcount++;
@@ -244,7 +231,7 @@ int test_mixer(int argc, char *argv[])
 
 	for (int j = -jmax; j <= jmax; j++) {
 
-		for (int i = 0; i < output_max; i++) {
+		for (unsigned i = 0; i < output_max; i++) {
 			actuator_controls[i] = j/10.0f + 0.1f * i;
 			r_page_servo_disarmed[i] = PWM_LOWEST_MIN;
 			r_page_servo_control_min[i] = PWM_DEFAULT_MIN;
@@ -257,11 +244,11 @@ int test_mixer(int argc, char *argv[])
 		pwm_limit_calc(should_arm, mixed, r_page_servo_disarmed, r_page_servo_control_min, r_page_servo_control_max, outputs, r_page_servos, &pwm_limit);
 
 		warnx("mixed %d outputs (max %d)", mixed, output_max);
-		for (int i = 0; i < mixed; i++)
+		for (unsigned i = 0; i < mixed; i++)
 		{
 			servo_predicted[i] = 1500 + outputs[i] * (r_page_servo_control_max[i] - r_page_servo_control_min[i]) / 2.0f;
 			if (fabsf(servo_predicted[i] - r_page_servos[i]) > 2) {
-				printf("\t %d: %8.4f predicted: %d, servo: %d\n", i, outputs[i], servo_predicted[i], (int)r_page_servos[i]);
+				printf("\t %d: %8.4f predicted: %d, servo: %d\n", i, (double)outputs[i], servo_predicted[i], (int)r_page_servos[i]);
 				warnx("mixer violated predicted value");
 				return 1;
 			}
@@ -282,7 +269,7 @@ int test_mixer(int argc, char *argv[])
 		pwm_limit_calc(should_arm, mixed, r_page_servo_disarmed, r_page_servo_control_min, r_page_servo_control_max, outputs, r_page_servos, &pwm_limit);
 
 		//warnx("mixed %d outputs (max %d), values:", mixed, output_max);
-		for (int i = 0; i < mixed; i++)
+		for (unsigned i = 0; i < mixed; i++)
 		{
 			/* check mixed outputs to be zero during init phase */
 			if (r_page_servos[i] != r_page_servo_disarmed[i]) {
@@ -316,7 +303,7 @@ int test_mixer(int argc, char *argv[])
 		pwm_limit_calc(should_arm, mixed, r_page_servo_disarmed, r_page_servo_control_min, r_page_servo_control_max, outputs, r_page_servos, &pwm_limit);
 
 		//warnx("mixed %d outputs (max %d), values:", mixed, output_max);
-		for (int i = 0; i < mixed; i++)
+		for (unsigned i = 0; i < mixed; i++)
 		{
 			/* predict value */
 			servo_predicted[i] = 1500 + outputs[i] * (r_page_servo_control_max[i] - r_page_servo_control_min[i]) / 2.0f;
@@ -333,7 +320,7 @@ int test_mixer(int argc, char *argv[])
 			/* check post ramp phase */
 			if (hrt_elapsed_time(&starttime) > RAMP_TIME_US &&
 				fabsf(servo_predicted[i] - r_page_servos[i]) > 2) {
-				printf("\t %d: %8.4f predicted: %d, servo: %d\n", i, outputs[i], servo_predicted[i], (int)r_page_servos[i]);
+				printf("\t %d: %8.4f predicted: %d, servo: %d\n", i, (double)outputs[i], servo_predicted[i], (int)r_page_servos[i]);
 				warnx("mixer violated predicted value");
 				return 1;
 			}
@@ -372,6 +359,7 @@ int test_mixer(int argc, char *argv[])
 	}
 
 	warnx("SUCCESS: No errors in mixer test");
+	return 0;
 }
 
 static int
diff --git a/src/systemcmds/tests/test_mtd.c b/src/systemcmds/tests/test_mtd.c
index bac9efbdb..43231ccad 100644
--- a/src/systemcmds/tests/test_mtd.c
+++ b/src/systemcmds/tests/test_mtd.c
@@ -57,6 +57,8 @@
 #define PARAM_FILE_NAME "/fs/mtd_params"
 
 static int check_user_abort(int fd);
+static void print_fail(void);
+static void print_success(void);
 
 int check_user_abort(int fd) {
 	/* check if user wants to abort */
@@ -126,7 +128,7 @@ test_mtd(int argc, char *argv[])
 		uint8_t write_buf[chunk_sizes[c]] __attribute__((aligned(64)));
 
 		/* fill write buffer with known values */
-		for (int i = 0; i < sizeof(write_buf); i++) {
+		for (unsigned i = 0; i < sizeof(write_buf); i++) {
 			/* this will wrap, but we just need a known value with spacing */
 			write_buf[i] = i+11;
 		}
@@ -137,11 +139,14 @@ test_mtd(int argc, char *argv[])
 		int fd = open(PARAM_FILE_NAME, O_RDONLY);
 		int rret = read(fd, read_buf, chunk_sizes[c]);
 		close(fd);
+		if (rret <= 0) {
+			err(1, "read error");
+		}
 
 		fd = open(PARAM_FILE_NAME, O_WRONLY);
 
 		printf("printing 2 percent of the first chunk:\n");
-		for (int i = 0; i < sizeof(read_buf) / 50; i++) {
+		for (unsigned i = 0; i < sizeof(read_buf) / 50; i++) {
 			printf("%02X", read_buf[i]);
 		}
 		printf("\n");
@@ -166,14 +171,16 @@ test_mtd(int argc, char *argv[])
 		}
 		end = hrt_absolute_time();
 
+		warnx("write took %llu us", (end - start));
+
 		close(fd);
 		fd = open(PARAM_FILE_NAME, O_RDONLY);
 
 		/* read back data for validation */
 		for (unsigned i = 0; i < iterations; i++) {
-			int rret = read(fd, read_buf, chunk_sizes[c]);
+			int rret2 = read(fd, read_buf, chunk_sizes[c]);
 
-			if (rret != chunk_sizes[c]) {
+			if (rret2 != (int)chunk_sizes[c]) {
 				warnx("READ ERROR!");
 				print_fail();
 				return 1;
@@ -182,7 +189,7 @@ test_mtd(int argc, char *argv[])
 			/* compare value */
 			bool compare_ok = true;
 
-			for (int j = 0; j < chunk_sizes[c]; j++) {
+			for (unsigned j = 0; j < chunk_sizes[c]; j++) {
 				if (read_buf[j] != write_buf[j]) {
 					warnx("COMPARISON ERROR: byte %d", j);
 					print_fail();
@@ -211,7 +218,7 @@ test_mtd(int argc, char *argv[])
 	char ffbuf[64];
 	memset(ffbuf, 0xFF, sizeof(ffbuf));
 	int fd = open(PARAM_FILE_NAME, O_WRONLY);
-	for (int i = 0; i < file_size / sizeof(ffbuf); i++) {
+	for (unsigned i = 0; i < file_size / sizeof(ffbuf); i++) {
 		int ret = write(fd, ffbuf, sizeof(ffbuf));
 
 		if (ret != sizeof(ffbuf)) {
diff --git a/src/systemcmds/tests/test_ppm_loopback.c b/src/systemcmds/tests/test_ppm_loopback.c
index b9041b013..addd57bea 100644
--- a/src/systemcmds/tests/test_ppm_loopback.c
+++ b/src/systemcmds/tests/test_ppm_loopback.c
@@ -65,7 +65,6 @@ int test_ppm_loopback(int argc, char *argv[])
 	int _rc_sub = orb_subscribe(ORB_ID(input_rc));
 
 	int servo_fd, result;
-	servo_position_t data[PWM_OUTPUT_MAX_CHANNELS];
 	servo_position_t pos;
 
 	servo_fd = open(PWM_OUTPUT_DEVICE_PATH, O_RDWR);
diff --git a/src/systemcmds/tests/test_rc.c b/src/systemcmds/tests/test_rc.c
index 57c0e7f4c..c9f9ef439 100644
--- a/src/systemcmds/tests/test_rc.c
+++ b/src/systemcmds/tests/test_rc.c
@@ -52,6 +52,7 @@
 #include <arch/board/board.h>
 #include <drivers/drv_pwm_output.h>
 #include <drivers/drv_rc_input.h>
+#include <drivers/drv_hrt.h>
 #include <systemlib/err.h>
 
 #include "tests.h"
diff --git a/src/systemcmds/tests/test_servo.c b/src/systemcmds/tests/test_servo.c
index ef8512bf5..9c6951ca2 100644
--- a/src/systemcmds/tests/test_servo.c
+++ b/src/systemcmds/tests/test_servo.c
@@ -51,6 +51,7 @@
 
 #include <arch/board/board.h>
 #include <drivers/drv_pwm_output.h>
+#include <systemlib/err.h>
 
 #include <nuttx/spi.h>
 
diff --git a/src/systemcmds/tests/tests_main.c b/src/systemcmds/tests/tests_main.c
index fe22f6177..e3f26924f 100644
--- a/src/systemcmds/tests/tests_main.c
+++ b/src/systemcmds/tests/tests_main.c
@@ -235,7 +235,7 @@ test_perf(int argc, char *argv[])
 	printf("perf: expect count of 1\n");
 	perf_print_counter(ec);
 	printf("perf: expect at least two counters\n");
-	perf_print_all();
+	perf_print_all(0);
 
 	perf_free(cc);
 	perf_free(ec);
diff --git a/src/systemcmds/top/module.mk b/src/systemcmds/top/module.mk
index 9239aafc3..548a09f85 100644
--- a/src/systemcmds/top/module.mk
+++ b/src/systemcmds/top/module.mk
@@ -38,7 +38,7 @@
 MODULE_COMMAND	 = top
 SRCS		 = top.c
 
-MODULE_STACKSIZE = 3000
+MODULE_STACKSIZE = 1700
 
 MAXOPTIMIZATION	 = -Os
 
diff --git a/src/modules/fixedwing_att_control/module.mk b/src/systemcmds/ver/module.mk
index fd1a8724a..2eeb80b61 100644
--- a/src/modules/fixedwing_att_control/module.mk
+++ b/src/systemcmds/ver/module.mk
@@ -1,6 +1,6 @@
 ############################################################################
 #
-#   Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved.
+#   Copyright (c) 2014 PX4 Development Team. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
@@ -32,11 +32,13 @@
 ############################################################################
 
 #
-# Fixedwing Attitude Control application
+# "version" nsh-command displays version infromation for hw,sw, gcc,build etc
+# can be also included and used in own code via "ver.h"
 #
 
-MODULE_COMMAND	= fixedwing_att_control
+MODULE_COMMAND	 	= ver
+SRCS		 		= ver.c
 
-SRCS		= fixedwing_att_control_main.c \
-		  fixedwing_att_control_att.c \
-		  fixedwing_att_control_rate.c
+MODULE_STACKSIZE 	= 1024
+
+MAXOPTIMIZATION	 	= -Os
diff --git a/src/systemcmds/ver/ver.c b/src/systemcmds/ver/ver.c
new file mode 100644
index 000000000..9ae080ee2
--- /dev/null
+++ b/src/systemcmds/ver/ver.c
@@ -0,0 +1,123 @@
+/****************************************************************************
+*
+* Copyright (c) 2014 PX4 Development Team. All rights reserved.
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions
+* are met:
+*
+* 1. Redistributions of source code must retain the above copyright
+* notice, this list of conditions and the following disclaimer.
+* 2. Redistributions in binary form must reproduce the above copyright
+* notice, this list of conditions and the following disclaimer in
+* the documentation and/or other materials provided with the
+* distribution.
+* 3. Neither the name PX4 nor the names of its contributors may be
+* used to endorse or promote products derived from this software
+* without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+* POSSIBILITY OF SUCH DAMAGE.
+*
+****************************************************************************/
+
+/**
+* @file ver.c
+*
+* Version command, unifies way of showing versions of HW, SW, Build, GCC
+* In case you want to add new version just extend version_main function
+*
+* @author Vladimir Kulla <ufon@kullaonline.net>
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include <version/version.h>
+#include <systemlib/err.h>
+
+// string constants for version commands
+static const char sz_ver_hw_str[] 	= "hw";
+static const char sz_ver_hwcmp_str[] = "hwcmp";
+static const char sz_ver_git_str[] 	= "git";
+static const char sz_ver_bdate_str[] = "bdate";
+static const char sz_ver_gcc_str[] 	= "gcc";
+static const char sz_ver_all_str[] 	= "all";
+
+static void usage(const char *reason)
+{
+	if (reason != NULL) {
+		printf("%s\n", reason);
+	}
+
+	printf("usage: ver {hw|hwcmp|git|bdate|gcc|all}\n\n");
+}
+
+__EXPORT int ver_main(int argc, char *argv[]);
+
+int ver_main(int argc, char *argv[])
+{
+	int ret = 1;	//defaults to an error
+
+	// first check if there are at least 2 params
+	if (argc >= 2) {
+		if (argv[1] != NULL) {
+			if (!strncmp(argv[1], sz_ver_hw_str, sizeof(sz_ver_hw_str))) {
+				printf("%s\n", HW_ARCH);
+				ret = 0;
+
+			} else if (!strncmp(argv[1], sz_ver_hwcmp_str, sizeof(sz_ver_hwcmp_str))) {
+				if (argc >= 3 && argv[2] != NULL) {
+					// compare 3rd parameter with HW_ARCH string, in case of match, return 0
+					ret = strncmp(HW_ARCH, argv[2], strlen(HW_ARCH));
+
+					if (ret == 0) {
+						printf("ver hwcmp match: %s\n", HW_ARCH);
+					}
+
+				} else {
+					errx(1, "Not enough arguments, try 'ver hwcmp PX4FMU_V2'");
+				}
+
+			} else if (!strncmp(argv[1], sz_ver_git_str, sizeof(sz_ver_git_str))) {
+				printf("%s\n", FW_GIT);
+				ret = 0;
+
+			} else if (!strncmp(argv[1], sz_ver_bdate_str, sizeof(sz_ver_bdate_str))) {
+				printf("%s %s\n", __DATE__, __TIME__);
+				ret = 0;
+
+			} else if (!strncmp(argv[1], sz_ver_gcc_str, sizeof(sz_ver_gcc_str))) {
+				printf("%s\n", __VERSION__);
+				ret = 0;
+
+			} else if (!strncmp(argv[1], sz_ver_all_str, sizeof(sz_ver_all_str))) {
+				printf("HW arch: %s\n", HW_ARCH);
+				printf("Build datetime: %s %s\n", __DATE__, __TIME__);
+				printf("FW git-hash: %s\n", FW_GIT);
+				printf("GCC toolchain: %s\n", __VERSION__);
+				ret = 0;
+
+			} else {
+				errx(1, "unknown command.\n");
+			}
+
+		} else {
+			usage("Error, input parameter NULL.\n");
+		}
+
+	} else {
+		usage("Error, not enough parameters.");
+	}
+
+	return ret;
+}