(Dave Nadler YO) writes:

The heading sensor issue is a bit difficult. Certainly it can be
done with GPS using multiple antennas (I can't remember the
commercial products that do this off-hand). Google and you'll find a
few research projects using GPS for attitude as well as
heading. Cost is not on for gliders real soon. Compasses are very
cranky beasts, especially if they need to be glider- pilot-proof
(about which I could tell stories for hours). Making something that
is low-cost, self-calibrating, immune to stupid installations -
that's the hard bit.

Many of the Marine GPS units have a `compass' option to add a second
antena and give a heading.

But if you are going to add a second set of electronics, then it is
almost a done deal to add TWO sets and have the full 6D position and
orientation data.

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