diff --git a/sw/airborne/subsystems/gps/gps_nmea.h b/sw/airborne/subsystems/gps/gps_nmea.h
index 20f8452d39..16c9706b7d 100644
--- a/sw/airborne/subsystems/gps/gps_nmea.h
+++ b/sw/airborne/subsystems/gps/gps_nmea.h
@@ -20,8 +20,8 @@
  *
  */
 
-/** \file gps_nmea.h
- * \brief NMEA protocol specific code
+/** @file gps_nmea.h
+ *  NMEA protocol specific code
  *
 */
 
@@ -33,6 +33,10 @@
 
 #define GPS_NB_CHANNELS 16
 
+#define GPS_FIX_NONE 0x00
+#define GPS_FIX_2D   0x02
+#define GPS_FIX_3D   0x03
+
 #ifdef DEBUG_NMEA
 #define NMEA_PRINT(...) {  UsbSPrintString( __VA_ARGS__);};
 #else