http://vancouver-webpages.com/peter/nmeafaq.txt
http://vancouver-webpages.com/pub/peter/index.html
http://membres.lycos.fr/grandzebu/informat/files_ut.htm
http://www.gpsinformation.org/dale/nmea.htm
http://www.nmea.de/nmea0183datensaetze.html
http://home.mira.net/~gnb/gps/nmea.html
http://www.nmea.org/