Quote Originally Posted by Duuude007 View Post
FFIV Lodestone Cavern

Its also possible they consider Lodestone a more modern terminology for levistone, which was used in FF1 to allow the airship to fly.
Damn, you beat me to it. This was exactly what I was going to put... pretty much verbatim.

Those are the only instances I can think of in terms of FF. Other than that, I really like the proto-compass explanation.