Something else to keep inline Gav is making sure your mapping software is set to the right GPS output format which is either NMEA or Garmin. Without software interferance your GPS will be outputting NMEA. Make sure that's what MemoryMap is using and check the speed is also correct. I would disable GPSGate for now, that's an extra layer you don't need for MemoryMap and could be tripping over itself. You only need GPSGate to get Garmin output and only Garmin software requires that, everyone else is happy with NMEA.