Furuno 1815 - Page 139

APPENDIX 3 DIGITAL INTERFACE
AP-12
VDM-AIS VHF Data-Link Message
VHW- Water Speed and Heading
VTG- Course Over Ground and Ground Speed
VWR-Wind Relative Bearing and Velocity
!**VDM,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)
$GPVHW,x.x,T,x.x,M,x.x,N,x.x,K,*hh <CR><LF>
1 2 3 4 5 6 7 8
1. Heading, degrees (0.0 to 359.9, null)
2. T=True (fixed)
3. Heading, degrees (0.0 to 359.9, null)
4. M=Magnetic (fixed)
5. Speed, knots (0.0 to 9999.9)
6. N=Knots (fixed)
7. Speed, knots (0.0 to 9999.9)
8. K=km/hr (fixed)
$GPVTG,x.x,T,x.x,M,x.x,N,x.x,K,a,*hh <CR><LF>
1 2 3 4 5 6 7 8 9
1. Course over ground, degrees (0.0 to 359.9)
2. T=True (fixed)
3. Course over ground, degrees (0.0 to 359.9)
4. M=Magnetic (fixed)
5. Speed over ground, knots (0.00 to 9999.9)
6. N=Knots (fixed)
7. Speed over ground (0.00 to 9999.9)
8. K=km/h (fixed)
9. Mode indicator (
A=Autonomous, D=Differential E=Estimated (dead reckoning)
M=Manual input S=Simulator N=Data not valid)
$**VWR,x.x,x,x.x,N,x.x,M,x.x,K<CR><LF>
1 2 3 4 5 6 7 8
1. Measured wind angle relative to the vessel, degrees (0.0 to 180.0)
2. L=Left semicircle, R=Right semicircle
3. Velocity, knots (0.0 to 9999.9)
4. Unit (N, fixed)
5. Velocity (0.0 to 999.9)
6. Unit (M, fixed)
7. Velocity, km/h
8. Unit (K, fixed)