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18
4.1.7 VTG – Course Over Ground and Ground Speed
Purpose
Outputs actual track made good and speed relative to the ground.
Format
$GPVTG,xxx.x,T,xxx.x,M,xxx.x,N,xxxx.x,K*CS
Example
$GPVTG,000.0,T,003.3,M,000.0,N,0000.0,K*7E
Output Rate
Programmable using EverMore Binary Message 0x8E and 0x8F.
Field Name Example Unit Description
1 Message ID $GPVTG VTG protocol header
2 Heading 000.0 degree xxx.x
Heading of the receiver when moving
Leading zeros transmitted
3 True T Indicates true heading
4 Heading 003.3 degree Degrees magnetic
Magnetic course over ground, 000 to 359
Degrees
Leading zeros transmitted
5 M M Indicates magnetic heading
6 Speed 000.0 knots xxx.x
Speed in knots
Leading zeros transmitted
7 N N Indicates speed in knots
8 Speed 0000.0 Km/hr xxxx.x
Speed in km/hr
Leading zeros transmitted
9 K K Indicates speed in km/hr
10 Checksum *7E