Newps writes:

Your complete misunderstanding of the GPS system is showing. I have two
GPS's in the plane, one panel mount and one portable. It is rare that
either one is ever off by more than 100 feet in altitude. Using GPS for
your altitude for VFR flight would be perfectly fine.

I can see the NTSB report now: "Pilot failed to understand limitations
of GPS navigation." But as long as I'm not flying with you, I don't
care. Do what you want.

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