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How many GPS satellites must be visible to get accurate time?

April 26, 2017accurate GPS satellites time visible

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How many GPS satellites must be visible to get accurate time?

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There are 24 operational GPS satellites with orbits distributed so that at least 4 of them are always visible from any point on the Earth at any given instant. There may be up to 12 visible at one time. Cuckoo needs to receive signals from at least 4 satellites to maintain a time fix.