The way GPS works is to use pairs of
satellites to determine hyperbolids which
are intersected with ones generated from
other pairs.


That's the way sailors do it, but they do it by hand using hyperboloids plotted
on their charts.

If there is a mathematically equivalent way to do it, it might be one that is
easier to program into a box, and maybe that's what an aviation GPS does. If
the alternative is not mathematically equivalent, then one of them is just
wrong.

Jose



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