GPS units known and tested to work with the scanner includes:
Delorme Tripmate (with modification for autostart)
GARMIN eTreX Legend
GARMIN GPSmap 60CS
Lowrance iFinder GO2
MAGELLAN Meridian Marine
The above list is not all-inclusive. Basically any GPS that outputs serial NMEA standard data should work with the scanner. As other units are used and confirmed to work, this section should be updated to include the other models. GPS units that only have a USB connection will not work with the scanner (well, it is possible that some units could be internally modified to work, but we're talking off-the-shelf, here).
The scanner understands the sentences GGA (Global Positioning System Fix Data) and RMC (Recommended Minimum Specific GNSS Data) based on “NMEA-0183 ver.3.01”.