Furuno FAR-28 Series Operator's Manual page 264

APPENDIX
HDT - Heading, true
$--HDT,x.x,T*hh<CR><LF>
| | |
| | +--------- 2
+----+----------- 1
1. Heading, degrees true
2. Checksum
MTW - Water temperature
$--MTW,x.x,C*hh<CR><LF>
| | |
| | +--------- 2
+--+----------- 1
1. Temperature, degrees C
2. Checksum
MWV - Wind speed and angle
$--MWV,x.x,a,x.x,a,A*hh<CR><LF>
| | | | | |
| | | | | +--------- 6
| | | | +----------- 5
| | | +------------- 4
| | +---------------- 3
| +------------------- 2
+---------------------- 1
1. Wind angle, 0 to 359 (degrees)
2. Reference, R=relative, T=true
3. Wind speed
4. Wind speed units, KN/M/N
5. Status, A=data valid, V=data invalid
6. Checksum
Data is used in case of A=data valid.
Data is not used in case of V=data invalid.
AP-14