gps: ublox sensor_gps_heading message

msg/CMakeLists.txt

@@ -138,6 +138,7 @@ set(msg_files
 	sensor_combined.msg
 	sensor_correction.msg
 	sensor_gps.msg
+	sensor_gps_heading.msg
 	sensor_gyro.msg
 	sensor_gyro_fft.msg
 	sensor_gyro_fifo.msg

msg/sensor_gps_heading.msg

@@ -0,0 +1,10 @@
+uint64 timestamp		# time since system start (microseconds)
+uint64 timestamp_sample
+
+uint32 device_id                # unique device ID for the sensor that does not change between power cycles
+
+float32 heading
+float32 heading_accuracy                 # [1e-5 deg] Accuracy of the heading of the relative position vector
+
+float32[3] relative_position    # relative position vector
+float32[3] relative_position_accuracy