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HDT - Heading - true
Actual vessel heading in degrees true produced by any device or system producing true heading.
$HEHDT, x.x, T*hh<CR><LF>
Checksum
Heading, degrees true
Note: For NMEA0183 Ver.1.5 setting (SW3-1: OFF),
checksum is null field.
VHW - Water speed and heading
The compass heading to which the vessel points and the speed of the vessel relative to the water.
$HEVHW,x.x,T,x.x,M,x.x,N,x.x,K*hh<CR><LF>
|||||||||
||||||||+---------5
||||||+--+-----------4
||||+--+-----------------3
||+---+-----------------------2
+---+-----------------------------1
1.Heading,degreestrue
2.Heading,degreesmagnetic
3.Speed,knots
4.Speed,km/h
5.Checksum
Note1: No.2, 3, and 4 are null fields.
Note2: For NMEA0183 Ver.1.5 setting (SW3-1: OFF),
checksum is null field.