NMEA (0183 Standard)- National Marine Electronics Association

A standard interface protocol, which is often used for real-time tracking and autopilot systems. Most Garmin products output their data in this format (iQue is an exception) so they can easily talk to external devices.

The data is usually RS-232 compatible and it uses 4800 bps, 8 data bits, no parity and one stop bit ( 8N1 ). NMEA 0183 sentences are all ASCII. Each sentence begins with a dollarsign ($) and ends with a carriage return linefeed. Data is comma delimited. All commas must be included as they act as markers. A sample NMAE 0183 sentence may look like this:

$GPGGA,092204.999,4250.5589,S,14718.5084,E,1,04,24.4,19.7,M,,,,0000*1F