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geodetic WGS48 directions. VTG-Course Over Ground and Ground Speed $GPVTG,309.62,T,,M,0.13,N,0.2,K*6E Name Message ID Course Reference Course Reference Speed Units Speed Units Checksum <CR><LF> Example $GPVTG 309.62 T Units degrees degrees M 0.13 N 0.2 K *6E knots Km/hr Description VTG protocol header Measured heading True Measured heading Magnetic Measured horizontal speed Knots Measured horizontal speed Kilometers per hour End of message termination
