We should probably bite the bullet and try turning GPS off in a controlled test to see what breaks.
I don't know enough about GPS to suggest a method. The point of testing would be to find hidden dependencies. I'm curious whether any patchwork of localized outages could duplicate the effect of turning the system off.
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so essentially GPS is a completely passive protocol, the satellites send their unique signal down to the ground and a receiver collects three or more of these signals to triangulate itself. there’s no request/response communication, the client doesn’t talk to the satellite at all
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which is to say that precise localized blackouts are impossible, if you turn a satellite off overhead all clients within range will suffer equally. you could maybe disable a specific county or small state, but not much granular than that
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