Locate an iPhone reliably indoors?

Question

I\'m writing an app for a museum tour. I\'d like my app to know where the user is in the building, if the user is standing in a particular room, in front of a particular work, e

Answer 1

The only thing I can think of is bluetooth, but I'd think that would be nearly impossible to get right.

Most people have one or two RFID tags on them, if they allow it maybe you could have a handful of detectors rigged up. I know I carry 3 different ones (car keys, building passes) and maybe more.