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diff --git a/src/modules/navigator/gpsfailure.h b/src/modules/navigator/gpsfailure.h
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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 gpsfailure.h
+ * Helper class for Data Link Loss Mode according to the OBC rules
+ *
+ * @author Thomas Gubler <thomasgubler@gmail.com>
+ */
+
+#ifndef NAVIGATOR_GPSFAILURE_H
+#define NAVIGATOR_GPSFAILURE_H
+
+#include <controllib/blocks.hpp>
+#include <controllib/block/BlockParam.hpp>
+
+#include <uORB/uORB.h>
+#include <uORB/Publication.hpp>
+#include <uORB/topics/vehicle_attitude_setpoint.h>
+
+#include <drivers/drv_hrt.h>
+
+#include "navigator_mode.h"
+#include "mission_block.h"
+
+class Navigator;
+
+class GpsFailure : public MissionBlock
+{
+public:
+	GpsFailure(Navigator *navigator, const char *name);
+
+	~GpsFailure();
+
+	virtual void on_inactive();
+
+	virtual void on_activation();
+
+	virtual void on_active();
+
+private:
+	/* Params */
+	control::BlockParamFloat _param_loitertime;
+	control::BlockParamFloat _param_openlooploiter_roll;
+	control::BlockParamFloat _param_openlooploiter_pitch;
+	control::BlockParamFloat _param_openlooploiter_thrust;
+
+	enum GPSFState {
+		GPSF_STATE_NONE = 0,
+		GPSF_STATE_LOITER = 1,
+		GPSF_STATE_TERMINATE = 2,
+		GPSF_STATE_END = 3,
+	} _gpsf_state;
+
+	hrt_abstime _timestamp_activation; //*< timestamp when this mode was activated */
+
+	/**
+	 * Set the GPSF item
+	 */
+	void		set_gpsf_item();
+
+	/**
+	 * Move to next GPSF item
+	 */
+	void		advance_gpsf();
+
+};
+#endif