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APPENDIX
A
P-7
VHW - Water speed and heading
The compass heading to which the vessel points and the speed of the vessel relative to the water.
$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 - 359.9, NULL)
2. T=True (fixed)
3. Heading, degrees (0.0 - 359.9, NULL)
4. M=Magnetic (fixed)
5. Speed, knots (0.0 - 9999.9)
6. N=Knots (fixed)
7. Speed, knots (0.0 - 9999.9)
8. K=km/hr (fixed)
VLW - Distance travelled through the water
The distance travelled, relative to the water.
$**VLW,x.x,N,x.x,N,x.x,N,x.x,N,*hh<CR><LF>
1 2 3 4 5 6 7 8
1. Total cumulative water distance (0.0 - 999999.999)
2. N=Nautical miles
3. Water distance since reset (0.000 - 999999.999)
4. N=Nautical miles
5. Total cumulative ground distance (no use)
6. N=Nautical miles (no use)
7. Ground distance since reset (no use)
8. N=Nautical miles (no use)
VTG - Course over ground and ground speed
COG and SOG obtained by processing the GPS signals.
$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 - 359.9)
2. T=True (fixed)
3. Course over ground, degrees (0.0 - 359.9)
4. M=Magnetic (fixed)
5. Speed over ground, knots (0.00-9999.9)
6. N=Knots (fixed)
7. Speed over ground (0.00 - 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)
Note: Position system indicator with IEC ED2 only.
ZDA - Time and date
$GPZDA,hhmmss.ss,xx,xx,xxxx,xx,xx<CR><LF>
1 2 3 4 5 6
1. UTC (000000 - 235959)...See NOTE2
2. Day (01 - 31)
3. Month (01 -12)
4. Year (UTC, 0000 - 9999)
5. Local zone, hours (-13 to
±
13)...See NOTE1
6. Loca zone, minutes (00 to
±
59)
NOTE1 - Zone description if the number of whole hours added to local time to obtain GMT. Zone
description is negative for east longitudes.
NOTE2 – Decimal point and decimal fraction are not output.