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Table 5-9 RMC Data Format
Name Example Units Description
Message ID $GPRMC RMC protocol header
UTC Time 161229.487 hhmmss.sss
Status A A=data valid or V=data not valid
Latitude 3723.2475 ddmm.mmmm
N/S Indicator N N=north or S=south
Longitude 12158.3416 dddmm.mmmm
E/W Indicator W E=east or W=west
Speed Over
Ground
0.13 knots
Course Over
Ground
309.62 degrees True
Date 120598 ddmmyy
Magnetic
Variation(1)
degrees E=east or W=west
Checksum *10
<CR> <LF> End of message termination
NOTE: SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are
geodetic WGS84 directions.
5.7. Course Over Ground and Ground Speed (VTG)
Table 5-10 contains the values for the following example.
$GPVTG,309.62,T, ,M,0.13,N,0.2,K*6E
Table 5-10 VTG Data Format
12
Name Example Units Description
Message ID $GPVTG VTG protocol header
Course 309.62 degrees Measured heading
Reference T True
Course degrees Measured heading
Reference M Magnetic(1)
Speed 0.13 knots Measured horizontal speed
Units N Knots
Speed 0.2 km/hr Measured horizontal speed