User's Manual

SPSx50 Modular GPS Receiver User Guide 121
NMEA-0183 Output A
HDT Heading from True North
The HDT string is shown below, and Table A.7 describes the message fields.
$GPHDT,123.456,T*00
Table A.7 Heading from true north fields
Field Meaning
0 message ID $GPHDT
1 Heading in degrees
2 T: Indicates heading relative to True North
3 The checksum data, always begins with *