On Fri, 30 Oct 2015 15:49:14 -0700, Andrzej Kobus wrote:

On Friday, October 30, 2015 at 5:43:43 PM UTC-4,
wrote:
On Friday, October 30, 2015 at 2:20:55 PM UTC-7, Andrzej Kobus wrote:
I don't think there is such a thing as GPS compass, regardless if you
are moving or not. GPS is measuring your position, it has nothing to
do with measurement of magnetic field.

You can determine orientation (including direction) by using difference
in 3D position of two GPS receivers (actually their antennae) mounted
at a fixed displacement from each other. It's a bit more complicated
than it sounds, as ideally, the two GPS receivers will have
synchronized clocks and be using the same satellites for their position
solutions. So, the receivers used are quite specialized.

You are right, with two receivers and antennas far apart to mitigate the
errors it is possible. Not something that one would want to mount in an
aircraft.

You could get a reliable heading with a fluxgate (solid state) compass
but not, as you say, with a single GPS receiver.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |