Not sure if I understand the question, NMEA is a GPS output format that contains all the data. When a GPS is used with RaceChrono, the GPS receiver sends the NMEA over to RaceChrono which parses it to an internal format. Normal GPS (like the XT) sends atleast $GPGGA, $GPRMC, $GPGSA and $GPGSV sentences. RaceChrono can handle a few other sentences too.
what i whant to know which are the perfect NMEA settings for better Racechrono result?
thats why i was asking you the meaning and funcionality of each NMEA.
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thats why i was asking you the meaning and funcionality of each NMEA.