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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<CR><LF>
Parameters Descriptions Notes
vtg1 Course over ground (degrees) Referenced to true north
(000.00
o
~ 359.99
o
)
vtg2 Indicator of course reference T – true north
vtg3 Course over ground (degrees) Referenced to magnetic
north (000.00
o
~ 359.99
o
)
vtg4 Indicator of course reference M – magnetic north
vtg5 Speed over ground (knots)
vtg6 Unit of speed N – nautical miles per hour
vtg7 Speed over ground (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