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Fun fact: GPS uses 10 bits to store the week. That means it runs out... oh heck – April 6, 2019

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Isn't it transmitted as part of the signal? It contains four hours worth of position information and the precise time/date is used locally to calculate an interpolated position for that exact moment. The almanac is the thing that is stored to speed startup. That's valid for 180 days, and again the rough position is interpolated by calculations which use date/time.

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