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diff --git a/src/modules/navigator/datalinkloss.cpp b/src/modules/navigator/datalinkloss.cpp
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+/****************************************************************************
+ *
+ *   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 datalinkloss.cpp
+ * Helper class for Data Link Loss Mode according to the OBC rules
+ *
+ * @author Thomas Gubler <thomasgubler@gmail.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 "datalinkloss.h"
+
+#define DELAY_SIGMA	0.01f
+
+DataLinkLoss::DataLinkLoss(Navigator *navigator, const char *name) :
+	MissionBlock(navigator, name),
+	_param_commsholdwaittime(this, "CH_T"),
+	_param_commsholdlat(this, "CH_LAT"),
+	_param_commsholdlon(this, "CH_LON"),
+	_param_commsholdalt(this, "CH_ALT"),
+	_param_airfieldhomelat(this, "NAV_AH_LAT", false),
+	_param_airfieldhomelon(this, "NAV_AH_LON", false),
+	_param_airfieldhomealt(this, "NAV_AH_ALT", false),
+	_param_airfieldhomewaittime(this, "AH_T"),
+	_param_numberdatalinklosses(this, "N"),
+	_param_skipcommshold(this, "CHSK"),
+	_dll_state(DLL_STATE_NONE)
+{
+	/* load initial params */
+	updateParams();
+	/* initial reset */
+	on_inactive();
+}
+
+DataLinkLoss::~DataLinkLoss()
+{
+}
+
+void
+DataLinkLoss::on_inactive()
+{
+	/* reset DLL state only if setpoint moved */
+	if (!_navigator->get_can_loiter_at_sp()) {
+		_dll_state = DLL_STATE_NONE;
+	}
+}
+
+void
+DataLinkLoss::on_activation()
+{
+	_dll_state = DLL_STATE_NONE;
+	updateParams();
+	advance_dll();
+	set_dll_item();
+}
+
+void
+DataLinkLoss::on_active()
+{
+	if (is_mission_item_reached()) {
+		updateParams();
+		advance_dll();
+		set_dll_item();
+	}
+}
+
+void
+DataLinkLoss::set_dll_item()
+{
+	struct position_setpoint_triplet_s *pos_sp_triplet = _navigator->get_position_setpoint_triplet();
+
+	set_previous_pos_setpoint();
+	_navigator->set_can_loiter_at_sp(false);
+
+	switch (_dll_state) {
+	case DLL_STATE_FLYTOCOMMSHOLDWP: {
+		_mission_item.lat = (double)(_param_commsholdlat.get()) * 1.0e-7;
+		_mission_item.lon = (double)(_param_commsholdlon.get()) * 1.0e-7;
+		_mission_item.altitude_is_relative = false;
+		_mission_item.altitude = _param_commsholdalt.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 = _param_commsholdwaittime.get() < 0.0f ? 0.0f : _param_commsholdwaittime.get();
+		_mission_item.pitch_min = 0.0f;
+		_mission_item.autocontinue = true;
+		_mission_item.origin = ORIGIN_ONBOARD;
+
+		_navigator->set_can_loiter_at_sp(true);
+		break;
+	}
+	case DLL_STATE_FLYTOAIRFIELDHOMEWP: {
+		_mission_item.lat = (double)(_param_airfieldhomelat.get()) * 1.0e-7;
+		_mission_item.lon = (double)(_param_airfieldhomelon.get()) * 1.0e-7;
+		_mission_item.altitude_is_relative = false;
+		_mission_item.altitude = _param_airfieldhomealt.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.time_inside = _param_airfieldhomewaittime.get() < 0.0f ? 0.0f : _param_airfieldhomewaittime.get();
+		_mission_item.acceptance_radius = _navigator->get_acceptance_radius();
+		_mission_item.pitch_min = 0.0f;
+		_mission_item.autocontinue = true;
+		_mission_item.origin = ORIGIN_ONBOARD;
+
+		_navigator->set_can_loiter_at_sp(true);
+		break;
+	}
+	case DLL_STATE_TERMINATE: {
+		/* Request flight termination from the commander */
+		_navigator->get_mission_result()->flight_termination = true;
+		_navigator->publish_mission_result();
+		warnx("not switched to manual: request flight termination");
+		pos_sp_triplet->previous.valid = false;
+		pos_sp_triplet->current.valid = false;
+		pos_sp_triplet->next.valid = false;
+		break;
+	}
+	default:
+		break;
+	}
+
+	reset_mission_item_reached();
+
+	/* convert mission item to current position setpoint and make it valid */
+	mission_item_to_position_setpoint(&_mission_item, &pos_sp_triplet->current);
+	pos_sp_triplet->next.valid = false;
+
+	_navigator->set_position_setpoint_triplet_updated();
+}
+
+void
+DataLinkLoss::advance_dll()
+{
+	switch (_dll_state) {
+	case DLL_STATE_NONE:
+		/* Check the number of data link losses. If above home fly home directly */
+		/* if number of data link losses limit is not reached fly to comms hold wp */
+		if (_navigator->get_vstatus()->data_link_lost_counter > _param_numberdatalinklosses.get()) {
+			warnx("%d data link losses, limit is %d, fly to airfield home",
+					_navigator->get_vstatus()->data_link_lost_counter, _param_numberdatalinklosses.get());
+			mavlink_log_info(_navigator->get_mavlink_fd(), "#audio: too many DL losses, fly to airfield home");
+			_navigator->get_mission_result()->stay_in_failsafe = true;
+			_navigator->publish_mission_result();
+			_dll_state = DLL_STATE_FLYTOAIRFIELDHOMEWP;
+		} else {
+			if (!_param_skipcommshold.get()) {
+				warnx("fly to comms hold, datalink loss counter: %d", _navigator->get_vstatus()->data_link_lost_counter);
+				mavlink_log_info(_navigator->get_mavlink_fd(), "#audio: fly to comms hold");
+				_dll_state = DLL_STATE_FLYTOCOMMSHOLDWP;
+			} else {
+				/* comms hold wp not active, fly to airfield home directly */
+				warnx("Skipping comms hold wp. Flying directly to airfield home");
+				mavlink_log_info(_navigator->get_mavlink_fd(), "#audio: fly to airfield home, comms hold skipped");
+				_dll_state = DLL_STATE_FLYTOAIRFIELDHOMEWP;
+			}
+		}
+		break;
+	case DLL_STATE_FLYTOCOMMSHOLDWP:
+		warnx("fly to airfield home");
+			mavlink_log_info(_navigator->get_mavlink_fd(), "#audio: fly to airfield home");
+		_dll_state = DLL_STATE_FLYTOAIRFIELDHOMEWP;
+		_navigator->get_mission_result()->stay_in_failsafe = true;
+		_navigator->publish_mission_result();
+		break;
+	case DLL_STATE_FLYTOAIRFIELDHOMEWP:
+		_dll_state = DLL_STATE_TERMINATE;
+		warnx("time is up, state should have been changed manually by now");
+		mavlink_log_info(_navigator->get_mavlink_fd(), "#audio: no manual control, terminating");
+		_navigator->get_mission_result()->stay_in_failsafe = true;
+		_navigator->publish_mission_result();
+		break;
+	case DLL_STATE_TERMINATE:
+		warnx("dll end");
+		_dll_state = DLL_STATE_END;
+		break;
+
+	default:
+		break;
+	}
+}