Nomen Nescio writes:

But your altitude is much more important than ground track.

You cannot find your altitude with a compass alone.

Why not three.

Three adds mostly redundancy rather than any additional functionality in
lateral navigation.

But it powers NO electronics in the plane.

The assertion was that there was no electricity. I've demonstrated this
assertion to be incorrect if the aircraft is powered by a typical
reciprocating gasoline engine.

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