NEMA String Definitions

GPGGA - GPS Fix Data:  Time, Lat, Long, HDOP, Alt, Age of Diff Data, Station ID

GPGLL - Geographic Position:  Lat, Long, Time

GPGSA - GPS DOP & Active Sat: Sat Acq Mode, Fix type, Sat ID's, PDOP, HDOP, VDOP

GPGSV - Sat's in View: #msgs, Msg#, Sats in view, (Sat #, elevation, azmuith, SNR(db))-> for each sat

GPRMC - Rec min GPS / Transit Data: Time, Lat, Long, Speed, Track made good, Date, Magnetic Variation, direction

GPVTG - Track Made Good / Ground Speed:  Track, units, Track, units, Speed, units, Speed, units

GPZDA - Time and Date:  UTC HHMMSS, Day, Month, Year, Local Hours, Local Mins

$PMOTG - Switch to Mot Binary @ 9600 baud