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NMEA 0183
http://www.nmea.org/pub/0183/index.html
on the official NMEA site. An industrial standard for communication between marine electronics devices.
NMEA 0183
http://www.kh-gps.de/nmea-faq.htm
Description of some sequences.
NMEA FAQ
http://vancouver-webpages.com/peter/nmeafaq.txt
Detailed information on NMEA 0183, with limited information on NMEA-0180 and NMEA 0182.