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COM2 Input (HDT protocol) :
NMEA 0183 V2.0
Receipt of the HDT protocol with the heading contained. In addition, the DDC telegram (see
below) can be used to set the brightness in 4 levels.
COM3 Input (VBW, VHW and VTG Protocol)
NMEA 0183 V2.0
Receipt of protocols VBW, VHW and VTG with the therein contained heading and the ship’s
speed. In addition, the DDC telegram (see below) can be used to set the brightness in 4
levels.
$VD
VBW
,xx.x,xx.x,A,xx.x,xx.x,A,xx.x,A,xx.x,A*HL<CR><LF>
Unused
Transversal speed over ground in knots
Longitudinal speed over ground in knots
Transversal speed over water in knots
Longitudinal speed over water in knots
Status: A=valid, every other character = invalid
T = Heading in reference to geographical north
$GP
VTG
,x.x,T,,M,xx.x,N,,K*HL<CR><LF>
Speed over ground in knots
Unit: knots
Course over ground in degrees
T = Heading in reference to geographical north
$VH
VHW
,xxx.x,T,,M,xx.x,N,,K*HL<CR><LF>
Speed over water in knots
Unit: knots
Heading in degrees
$HE
HDT
,xx.x,T*HL<CR><LF>
T = reference to geographical north
heading in degree