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APPENDIX 3 DIGITAL INTERFACE
AP-27
THS - True heading and status
VBW - Dual ground/water speed
VDM - UAIS VHF data-link message
VDO - UAIS VHFG data-link own vessel report
$GPRMC,hhmmss.ss,A,llll.ll,a,yyyyy.yy,a,x.x,x.x,ddmmyy,x.x,a,a,a*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10
11 1213
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,xxx.x,a*hh<CR><LF>
1 2
1. Heading, degrees True (0.00 to 360.00)
2. Mode indicator (A=Autonomous S=Simulator)
$**VBW,x.x,x.x,x,x.x,x.x,x,x.x,x,x.x,x,*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10
1. Longitudinal water speed, knots (-99.949 - 99.949)
2. Transverse water speed, knots (-99.949 - 99.949, null)
3. Status: water speed, A=data valid V=data invalid
4. Longitudinal ground speed, knots (-99.949 - 99.949)
5. Transverse ground speed, knots (-99.949 - 99.949, null)
6. Status: ground speed, A=data valid V=data invalid
7. Stern transverse water speed, knots (-99.949 - 99.949)
8. Status: stern water speed, A=data valid V=data invalid
9. Stern transverse ground speed, knots (-99.949 - 99.949)
10. Status: stern ground speed, A=data valid V=data invalid
!AIVDM,x,x,x,x,s--s,x,*hh<CR><LF>
1 2 3 4 5 6
1. Total number of sentences needed to transfer the message (1 to 9)
2. Message sentence number (1 to 9)
3. Sequential message identifier (0 to 9, NULL)
4. AIS channel Number (A or B)
5. Encapsulated ITU-R M.1371 radio message (1 - 63 bytes)
6. Number of fill-bits (0 to 5)