COZY: Static Error on altitude
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The GPS satellites are scattered around the sky in the horizontal plane so you get lots of position lines, good geometry and accurate horizontal fixes BUT all the satellites in view are above the horizon by say 10 degrees thus only 160 deg of the vertical plane and less accurate positioning vertically.
Add to which the basic vertical datum for GPS is the center of the earth not mean sea level.
On Mon, 29 Jun 2020 at 04:21, Tom Brusehaver <cozytom@...> wrote: