- Plain ASCII text
- Lat, long, (maybe) altitude, and time
- NMEA-0183
- ASCII "sentences" over RS-232 at 4800 baud, 8N1
- Published by the National Marine Electronics Association
- Live navigation and ephemeris data
- Write-only
- Proprietary formats
- e.g. Garmin's GRMN format
- Used to fetch and store tracklogs, waypoints, base maps, etc.
- Read/write
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