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Originally Posted by clop
Correct me if I'm wrong (as I frequently seem to be) but all the GPS satellites have atomic clocks on-board already. They broadcast a very precise and accurate time signal. That's how a GPS receiver triangulates its position, by comparing the difference in the time signals from the satellites it can hear, the positions of which are extremely accurately known.
clop
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Yes, that's right, except they quadrangulate: you need four satellites to determine your position, since x,y,z and t are unknowns.