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I guess you could say that it all started in 1972. The United States Air Force Central Inertial Guidance Test Facility or as I like to call it, the USAFCIGTF experimented with two GPS prototypes in flight tests, using ground based pseudo satellites over White Sands Missile Range, or as I like to call it, the WSMR.

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Q: How long did it take us to build the GPS?
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