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GGA= Essential fix data with 3D location and accuracy (preferred sentence)
This includes Lat / Long, fix quality, number of satellites, horizontal dilution of position, altitude above sea level, height of geoid (mean sea level), time in seconds since last DGPS update, DGPS ID, and checksum data.
GLL= Geographic position, Lat / Long
This includes Lat / Long position, time of fix, data active or V (void) and checksum data.
RMC= NMEA recommended minimum
This includes time of fix, active or void, Lat / Long, speed over ground, track angle, date, magnetic variation, and checksum data.
