Regardless, in this case GPS derived altitude was quite good.

Ron Lee



One of the challenges with GPS fixes (both horizontal and vertical) is that
there is a statistical distribution of the error. Most receivers advertise
being within 15' laterally, 90% of the time. It's that other 10% that you
gotta worry about.

Surveyors improve their accuracy by leaving the GPS receiver stationary to
get a statistical sampling that can reveal the true position.

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Travis
Lake N3094P
PWK