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The Navstar system is pretty sophisticated, they can mis-time positioning signals from the satellites when they pass over certain parts of the world so that the Civilian-band GPS units can't give accurate fixes. It's called Selective Availability and was on worldwide until near the end of Clinton's term when he had it shut off. That's why we can get GPS signals that show us on the road instead of driving two hundred feet to the left, then instantly zig-zagging to 300 feet ahead, and so on.
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