GPS altitude again is close to actual

Ron Lee writes:

Altitude accuracy is not as good as horizontal for reasons already
mentioned...not because of a design issue.

It's also a design issue. GPS was designed to provide highly accurate
lateral positioning; vertical positioning was just a fringe benefit
and no great effort was put into making it accurate. The intended
users of GPS didn't need much vertical accuracy, as they were
typically on the ground or on the sea.

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