Quick Dumb Question

[jmfargo]

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?

Comments

[spaceoperadiva.livejournal.com]

Ask remus_shepherd. He is wise in this sort of thing.

[jfargo.livejournal.com]

Well, even if he doesn't answer the question, you've at least pointed me to someone new to read. He seems interesting!