[ gpsdrive ] libgps

[Hamish]

> > or maybe better: we set it depending on the travel mode:
> > "track" for plane and boat, "heading" for all the others?

No! definition is the same regardless of mode of travel.
otherwise you just propagate the confusion.

> "Track" is where you've been, allowing for leeway, tide etc. " hdg" is
> just where you are pointing.


the two words to be used should be "bearing" vs "heading"
see the NMEA faq in Documentation/ for usage

often course-over-ground (COG) is used to make it east to tell which one
you are talking about.

fwiw we've got a GPS compass that shows ship's aspect independent of ship's
COG. 2 gps antennas about 20cm appart, it works on phase difference I
think.
 

Hamish