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Chapter: 4. Installation
NMEA senteces transmitted
(talker) (IEC 61162-1:2007(E) (NMEA 0183) messages:
Speed and distance
Name Description Example
VTG
Course over ground and
ground speed
$VDVTG,,,,,x.x,N,x.x,K,a*hh<CR><LF>
VHW
Water speed and heading $VDVHW,,,,,x.x,N,x.x,K*hh <CR><LF>
VLW
Dual ground/water distance $VDVLW,x.x,N,x.x,N*hh<CR><LF>
VLW IEC07
Dual ground/water distance $VDVLW,x.x,N,x.x,N,x.x,N,x.x,N*hh<CR><LF>
VBW
Dual ground/water speed $VDVBW,x.x,x.x,A,x.x,x.x,A,x.x,A,x.x,A*hh <CR><LF>
When the VBW message is transmitted over COM2, the speed values have 1 decimal point. On all
other channels, number of decimals is 2.
Temperature
Name Description Example
MTW
Water temperature $VDMTW,x.x,C*hh<CR><LF>
Water Current
Name Description Example
VDR
Water current $VDR, x.x, T, x.x, M, x.x,*hh<CR><LF>
Xx, N Current speed, knots
x.x, MDirection, degrees magnetic
x.x,T - Direction, degrees true
Depth
Name Description Example
DPT
Depth $IIDPT,x.x,x.x*hh<CR><LF>
DBT
Depth below transducer $IIDBT,x.x,f,x.x,M,x.x,F*hh<CR><LF>
DBK
Depth below keel $IIDBK,x.x,f,x.x,M,x.x,F*hh<CR><LF>
Values will be preceded with sign as needed ( e.g “-“ = Astern, Port).
*hh = Checksum.
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