KVH Industries TracVision G4 - Manual (Page 138)

GyroTrac Data Outputs
54-0147 147
NMEA2 Magnetic Heading (HDG)
Communication: 4800 baud, 1 start bit, 8 data bits, 1 stop bit,
no parity
Update rate: Selectable at 1 to 20 Hz (10 Hz default)
Sentence type: $HCHDG,XXX.X, *hh <cr> <lf>
Sentence breakdown: HCHDG NMEA talker and sentence ID
XXX.X Stabilized magnetic heading in
degrees and tenths
* ASCII hex 0x2A
hh Checksum
cr Carriage return, ASCII hex 0x0D
lf Line feed, ASCII hex 0x0A
NMEA3 True Heading (HDT)
Communication: 4800 baud, 1 start bit, 8 data bits, 1 stop bit,
no parity
Update rate: Selectable at 1 to 20 Hz (10 Hz default)
Sentence type: $HCHDT,XXX.X,T *hh <cr> <lf>
Sentence breakdown: HCHDT NMEA talker and sentence ID
XXX.X Stabilized true heading in
degrees and tenths
T True heading, ASCII hex 0x54
* ASCII hex 0x2A
hh Checksum
cr Carriage return, ASCII hex 0x0D
lf Line feed, ASCII hex 0x0A
Table G-2
NMEA2 Magnetic
Heading Output
Table G-3
NMEA3 True
Heading Output
True Heading is only available
when GPS data input is received by
the ADCU. Refer to “Connecting
GPS for True North Capability” on
page 36
for complete details.