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APPENDIX 3 DIGITAL INTERFACE
HBT - Heartbeat supervision sentence
$**HBT,x.x,A,x*hh<CR><LF>
1 2 3
1. Configured repeat interval (00.0 to 99.9(s))
2. Equipment status (A=Normal V=System fail)
3. Sequential sequence identifier (0 to 9)
HDT - Heading, true
$**HDT, xxx.x,T*hh<CR><LF>
1 2
1. Heading, degrees (0.00 to 360.00)
2. True (T)
MTW - Water temperature
$**MTW,x.x,C<CR><LF>
1
1. Water temperature, degrees C (-100.000 - 100.000)
MWV - Wind speed and angle
$**MWV,x.x,a,x.x,a,A*hh<CR><LF>
1 2 3 4 5
1. Wind angle, degrees (0.00 - 360.00)
2. Reference (R/T)
3. Wind speed (0.00 - 9999.99)
4. Wind speed units (K=km/h M=m/s N=NM)
5. Status (A)
RMC - Recommended minimum specific GPS/TRANSIT data
$GPRMC,hhmmss.ss,A,llll.ll,a,yyyyy.yy,a,x.x,x.x,ddmmyy,x.x,a,a,a*hh<CR><LF>
1
1. UTC of position fix (000000 - 235959)
2. Status (A=data valid, V=navigation receiver warning)
3. Latitude (0000.00000 - 9000.0000)
4. N/S
5. Longitude (0000.00000 - 18000.0000)
6. E/W
7. Speed over ground, knots (0.00 - 99.94)
8. Course over ground, degrees true (0.0 - 360.0)
9. Date (010100 - 311299)
10. Magnetic variation, degrees E/W (0.00 - 180.0/NULL)
11. E/W
12. Mode indicator (A= Autonomous mode D= Differential mode S= Simulator
F=Float RTK P=Precise R=Real time kinematic E=Estimated (DR) M=Manual
13. Navigational status indication (S=Safe C=Caution U=Unsafe V=Navigational status not valid)
THS - True heading and status
$**THS,xxx.x,a*hh<CR><LF>
1 2
1. Heading, degrees True (0.00 to 360.00)
2. Mode indicator (A=Autonomous S=Simulator)
AP-10
2 3 4
5
6 7 8
9
10 11 1213
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