A high satellite gathers no moss
That 11,000 mile altitude is actually a benefit in this case, because something
that high is well clear of the atmosphere. And that means it will orbit according to very
simple mathematics.
The Air Force has injected each GPS satellite into a very precise orbit, according to
the GPS master plan.
On the ground all GPS receivers have an almanac programmed into their computers that
tells them where in the sky each satellite is, moment by moment.
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