Ron Natalie writes:

Nope, GPS finds a 3-d position based on the relative distances between
sets of satellites in geosynchronous orbit.

Roughly, yes.

It knows no more about
true north than magnetic without elaborate conversion between where
the satellites are at any given instant and where the earth is.

With two fixes, it has true north. If it's moving, it has at least two fixes.

Funny, I'm looking at the sky today and all I see are clouds.
My compass still works.

There are lots of places on Earth where your compass won't work, but an ANS
will.

You are clueless aren't you. The engine in just about every airplane
out there runs just freaking fine without any electrical power consumed
nor delivered to the rest of the aircraft.

Are they all Diesels?

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