NMEA-0183 message: HDT

Heading from True North

NOTE – The heading computation in this message is computed from the moving baseline vector, which requires a two-antenna system.

An example of the HDT string is:


Heading from true north message 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 *