AntennaTracker: To add a judgment of 0 degrees longitude.

AntennaTracker/sensors.cpp

@@ -108,7 +108,7 @@ void Tracker::update_GPS(void)
             // We countdown N number of good GPS fixes
             // so that the altitude is more accurate
             // -------------------------------------
-            if (current_loc.lat == 0) {
+            if (current_loc.lat == 0 && current_loc.lng == 0) {
                 ground_start_count = 5;
 
             } else {