24
VTG – Course Over Ground and Ground Speed
This message transmits the speed and course relative to ground.
$GPVTG,vtg1,vtg2,vtg3,vtg4,vtg5,vtg6,vtg7,vtg8,vtg9*hh<C
R><LF>
Parameters
Descriptions
Notes
vtg1
Course over ground (degrees)
Referenced to true north (xx.xx
o
)
vtg2
Indicator of course reference
T – true north
vtg3
Course over ground (degrees)
Not Support
vtg4
Indicator of course reference
M – magnetic north
vtg5
Speed over ground
x.xxx knots
vtg6
Unit of speed
N – nautical miles per hour
vtg7
Speed over ground
x.xxx km/hr
vtg8
Unit of speed
K – kilometers per hour
vtg9
Navigation mode indicator
A – Autonomous mode (fix);
D – Differential mode (fix);
E – DR (fix);
N – not valid
hh
Checksum
hex number (2 – character)
<CR><LF> End of message
