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

LDS Silver badge

Geostationary satellites can only be put in a restricted "belt" around the Earth equator - just having satellites there won't be useful to calculate your position in different places around the globe - you need to "triangulate" (let's keep it simple) using signals coming from different directions to minimize errors.

Moreover, depending on latitude they would appear quite low in the sky, and their signal would be easily blocked by mountains and buildings.

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