Capt.Mooron wrote:
Then it's a Fluxgate Compass on a GPS Receiver...

Yep.

... GPS cannot give you
compass directions without movement. Deal with it.


Yes, it can. Deal with it.

http://www.mx-marine.com/downloads/m...nual_rev12.pdf

Scroll down to page 10, where it explains that this unit is two GPS
receivers in a fixed mount (it also has a gyro "in case of GPS signal
blockage).

There is a similar suitcase-sized instrument for surveyors, but I can't
find a link to one.

DSK