diff --git a/libraries/DataFlash/DataFlash.h b/libraries/DataFlash/DataFlash.h
index 55382e4467..409d30728d 100644
--- a/libraries/DataFlash/DataFlash.h
+++ b/libraries/DataFlash/DataFlash.h
@@ -211,6 +211,7 @@ struct PACKED log_GPS {
     uint16_t gps_week;
     uint8_t  num_sats;
     uint16_t hdop;
+    uint16_t vdop;
     int32_t  latitude;
     int32_t  longitude;
     int32_t  rel_altitude;
@@ -688,7 +689,7 @@ Format characters in the format string for binary log messages
     { LOG_PARAMETER_MSG, sizeof(log_Parameter), \
       "PARM", "QNf",        "TimeUS,Name,Value" },    \
     { LOG_GPS_MSG, sizeof(log_GPS), \
-      "GPS",  "QBIHBcLLeeEefB", "TimeUS,Status,GMS,GWk,NSats,HDop,Lat,Lng,RAlt,Alt,Spd,GCrs,VZ,U" }, \
+      "GPS",  "QBIHBccLLeeEefB", "TimeUS,Stat,GMS,GWk,NSat,EPH,EPV,Lat,Lng,RAlt,Alt,Spd,GCrs,VZ,U" }, \
     { LOG_IMU_MSG, sizeof(log_IMU), \
       "IMU",  "QffffffIIfBB",     "TimeUS,GyrX,GyrY,GyrZ,AccX,AccY,AccZ,ErrG,ErrA,Temp,GyHlt,AcHlt" }, \
     { LOG_MESSAGE_MSG, sizeof(log_Message), \
diff --git a/libraries/DataFlash/LogFile.cpp b/libraries/DataFlash/LogFile.cpp
index 3e6735e731..6d8862721f 100644
--- a/libraries/DataFlash/LogFile.cpp
+++ b/libraries/DataFlash/LogFile.cpp
@@ -720,6 +720,7 @@ void DataFlash_Class::Log_Write_GPS(const AP_GPS &gps, uint8_t i, int32_t relati
         gps_week      : gps.time_week(i),
         num_sats      : gps.num_sats(i),
         hdop          : gps.get_hdop(i),
+        vdop          : gps.get_vdop(i),
         latitude      : loc.lat,
         longitude     : loc.lng,
         rel_altitude  : relative_alt,