Is it geekier to have looked up your address in the
census database survey database and used that instead?
I was going to give you crap for this method,
because it requires you to trust the gub'mint...
...Then I remembered who runs those GPS satellites I'm
so fond of. D'oh.
I suspect the truly geeky method would be to use
celestial navigation techniques, at least for latitude.
Longitude ... harder nut to crack; most of the good
time sources are gov't controlled, and most ephemeris
tables are generated by the gov't as well. (Heck,
longitude has always been political anyway.)
Being a paranoid government-conspiracy nut is hard work!