Furuno FCR-2107 Series Operator's Manual page 514

Appendix 5: Digital Interface
VHW - Water speed and heading
Recipient of sentences:
Expected nominal interval of sentences: 1 - 5 s
Alarm generated if message not received: 12 s ± 2 s
1. Heading, degrees true
VDR - Set and drift
$--VDR,x.x,T,x.x,M,x.x,N*hh<CR><LF>
| | | | | |
| | | | | |
| | | | +--+----------- 3
| | +--+----------------- 2
+--+----------------------- 1
1. Direction, degrees true
2. Direction, degrees magnetic
3. Current speed, knots
4. Checksum
AP-62
|
+--------- 4