NMEA-0183 message: PTNL,VHD

Heading information

The heading computation in this message is for the 'External' vector between a static or moving base and the primary antenna. It is only populated if the used correction stream contains the static or moving base position.

An example of the PTNL,VHD message string is:

$PTNL,VHD,030556.00,093098,187.718,-22.138,-76.929,-5.015,0.033,0.006,3,07,2.4,M*22

PTNL,VHD message fields

Field	Meaning
0	Message ID $PTNL
1	VHD
2	UTC of position in hhmmss.ss format
3	Date in mmddyy format
4	Azimuth
5	Rate of change of azimuth = azimuth/time
6	Vertical angle
7	Rate of change of vertical angle = vertical/time
8	Range
9	Rate of change of range between antenna = range/time
10	GPS Quality indicator: 0: Fix not available or invalid 1: Autonomous GPS fix 2: RTK float solution 3: RTK fix solution 4: Differential, code phase only solution (DGPS) 5: SBAS solution – WAAS/EGNOS/MSAS 6: RTK Float 3D network solution 7: RTK Fixed 3D network solution 8: RTK Float 2D network solution 9: RTK Fixed 2D network solution 10: OmniSTAR HP/XP solution 11: OmniSTAR VBS solution 12: Location RTK 13: Beacon DGPS 14: CenterPoint RTX 15: xFill
11	Number of satellites used in solution
12	PDOP
13	M
14	The checksum data, always begins with *