Why can GPSy auto-switch my Garmin from NMEA mode to Garmin data transfer mode automatically?
Unfortunately, neither the Garmin data protocol nor the NMEA protocol allow for such mode switching. We agree life would be much easier if it were possible since the NMEA protocol has so much more data than the GRMN protocol when in real-time mode. Write Garmin a postcard and ask them to add this feature!