diff --git a/msg/vehicle_gps_position.msg b/msg/vehicle_gps_position.msg
index 697bfb51d5..ab8a92873f 100644
--- a/msg/vehicle_gps_position.msg
+++ b/msg/vehicle_gps_position.msg
@@ -10,8 +10,11 @@ float32 s_variance_m_s		# GPS speed accuracy estimate, (metres/sec)
 float32 c_variance_rad		# GPS course accuracy estimate, (radians) 
 uint8 fix_type # 0-1: no fix, 2: 2D fix, 3: 3D fix, 4: RTCM code differential, 5: Real-Time Kinematic, float, 6: Real-Time Kinematic, fixed, 8: Extrapolated. Some applications will not use the value of this field unless it is at least two, so always correctly fill in the fix.   
 
-float32 eph			# GPS horizontal position accuracy (metres) 
-float32 epv			# GPS vertical position accuracy (metres) 
+float32 eph			# GPS horizontal position accuracy (metres)
+float32 epv			# GPS vertical position accuracy (metres)
+
+float32 hdop			# Horizontal dilution of precision
+float32 vdop			# Vertical dilution of precision
 
 int32 noise_per_ms		# GPS noise per millisecond
 int32 jamming_indicator		# indicates jamming is occurring