Furuno DS-50 Operator's Manual page 27

VHW - Water speed and heading
$--VHW,x.x,T,x.x,M,x.x,N,x.x,K*hh<CR><LF>
| | | | | | | | |
| | | | | | | | +--------- 5
| | | | | | +--+----------- 4
| | | | +--+----------------- 3
| | +--+----------------------- 2
+--+----------------------------- 1
1. Heading, degrees true
2. Heading, degrees magnetic
3. Speed, knots
4. Speed, km/h
5. Checksum
VLW - Distance traveled through water
$--VLW,x.x,N,x.x,N*hh<CR><LF>
| | | | |
| | | | +--------- 3
| | +--+----------- 2
+--+----------------- 1
1. Total cumulative distance, nautical miles
2. Distance since reset, nautical miles
3. Checksum
VTG - Course over ground and ground speed
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