From 6b463e5c9e6722988352cbe10ca817ac3fb90095 Mon Sep 17 00:00:00 2001
From: Werner Backes <op-dev@bit-1.de>
Date: Tue, 1 May 2012 23:42:59 +0200
Subject: [PATCH] Check GGA NMEA sentence for no/invalid fix flag

---
 flight/Modules/GPS/NMEA.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/flight/Modules/GPS/NMEA.c b/flight/Modules/GPS/NMEA.c
index 9ee472578..80977e124 100644
--- a/flight/Modules/GPS/NMEA.c
+++ b/flight/Modules/GPS/NMEA.c
@@ -402,6 +402,11 @@ static bool nmeaProcessGPGGA(GPSPositionData * GpsData, bool* gpsDataUpdated, ch
 		return false;
 	}
 
+
+	// check for invalid GPS fix
+	if (param[6][0] == '0') {
+		return false;
+	}
 	// get number of satellites used in GPS solution
 	GpsData->Satellites = atoi(param[7]);