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
TTrue heading, ASCII hex 0x54
* ASCII hex 0x2A
hh Checksum
cr Carriage return, ASCII hex 0x0D
lf Line feed, ASCII hex 0x0A
KVH Format Special Output Sentence (Set at Factory Only)
Communication: 9600 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: %AAAA,BBBB,CCCC <cr> <lf>
Sentence breakdown: % Sentence identifier
AAAA Stabilized pitch attitude in tenths
of degrees
BBBB Stabilized roll attitude in tenths
of degrees
CCCC Stabilized magnetic azimuth in
tenths of degrees
cr Carriage return, ASCII hex 0x0D
lf Line feed, ASCII hex 0x0A
GyroTrac Data Outputs
54-0161
143
Table F-3
NMEA3 True
Heading Output
Table F-4
KVH Output
Tr ue Heading is only available
when GPS data input is received by
the ADCU. Refer to “Connecting
GPS for True North Capability” on
page 38 for complete details.
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