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Quick Dumb Question
If you were to go far back in time, GPS systems would be useless because there are no satellites, correct?
Is there a system, in use today, that can tell you your relative position on the face of the Earth without use of satellites, and not requiring any input from the user?
Is there a system, in use today, that can tell you your relative position on the face of the Earth without use of satellites, and not requiring any input from the user?