AP1.2 Configuration of NMEA Ver-3.00 Sentence
AP1-13
1.2.19 VTG - Course over ground and ground speed
$--VTG , x.x , T, x.x , M , x.x , N, x.x , K , a *hh<CR><LF>
1 2 3 4 5
Contents
Data
DataData
Data
Note
1 Course over ground, degrees true
2 Course over ground, degrees magnetic
3 Speed over ground, knots
4 Speed over ground, km/h
The actual course and
speed relative to the
ground.
5 Mode indicator
Positioning system Mode indicator:
A= Autonomous mode
D= Differential mode
E= Estimated (dead reckoning)
mode
M= Manual input mode
S= Simulator mode
N= Data not valid
The positioning system Mode
indicator field shall not be a null
field.
1.2.20 VWR - Relative (Apparent) wind speed and angle
$--VWR , x.x , a , x.x , N , x.x , M , x.x , K *hh<CR><LF>
1 2 3 4
Contents Data Note
1
Measured wind angle relative to
the vessel, 0° to 180°, left/right
L/R of vessel heading
2 Measured wind speed, knots
3 Wind speed, meters/second
Relative (Apparent) wind speed
and angle
4 Wind speed, Km/Hr
1.2.21 VWT - True wind speed and angle
$--VWT , x.x , a , x.x , N , x.x , M , x.x , K *hh<CR><LF>
1 2 3 4
Contents Data Note
1
Calculated wind angle relative to
the vessel, 0° to 180°, left/right
L/R of vessel heading
2 Calculated wind speed, knots
3 Wind speed, meters/second
True wind speed and angle
4 Wind speed, Km/Hr
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