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GE863-GPS Software User Guide
1vv0300724 Rev. 2 - 24/01/07
5.4.6 VTG - Course Over Ground and Ground Speed
This sentence reports the actual course and speed relative to the ground.
Table I contains the values for the following example:
$GPVTG,309.62,T, ,M,0.13,N,0.2,K,A*23
Table I: VTG Data Format
Name Example Units Description
Message ID $GPVTG VTG protocol header
Course 309.62 Measured heading
Reference T True
Course degrees Measured heading
Reference M Magnetic
Speed 0.13 knots Measured horizontal speed
Units N Knots
Speed 0.2 km/hr Measured horizontal speed
Units K Kilometers per hour
Mode A
A=Autonomous, D=DGPS, E=DR
Checksum *23
<CR> <LF> End of message termination
NOTE: SiRF Technology Inc. does not support magnetic declination. All “course over ground”
data are geodetic WGS84 directions.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 99 of 109