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

[argonel.livejournal.com]

If you limit your time travel to within human history, just bring a deck of cards. Start playing a game of solitaire and when someone inevitable appear to tell you to put the red seven on the black eight you can ask them where you are.

[jfargo.livejournal.com]

HAH!

My mom used to do this all the time, but if you tried to help her she'd flip out. :)