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

[hippie-mamabear.livejournal.com]

What about a compass and a map? I mean you'd have to do some simple math...does that count as "input from the user?" :P

[jfargo.livejournal.com]

Well, a compass and a map are fine, but limited depending on how far back you go, AND can't help you figure out where you are in the first place if your machine (or however you travel) isn't exact.

But yeah, a compass and a map are fine if you know how to use them. :)