 Up to now we've been treating the calculations
that go into GPS very abstractly, as if the whole thing were happening in a vacuum. But in
the real world there are lots of things that can happen to a GPS signal that will make its
life less than mathematically perfect.
To get the most out of the system, a good GPS receiver needs to take a wide variety of
possible errors into account. Here's what they've got to deal with.
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