[GPSNavX]

MacENC relies on NMEA data (the standard for marine instrumentation) for all real-time data, but can use the proprietary Garmin mode for transferring waypoints, tracks and routes. Garmin proprietary mode does not lend itself well to real-time plotting as it lacks satellite and active waypoint info besides not being compatible with other NMEA data such as that from AIS, and other marine instrumentation (i.e. depth, wind).