And, given the massive amount of resources required to launch and maintain just one satellite, what's wrong with the old (and very cheap) map and compass?
May not be as accurate as GPS, but with proper training it's not far off! Certainly good enough for a post apocalyptic world such as T2K, and pretty much how everyone was doing it up until the 1990's anyway.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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