I believe what most people believe is the GPS chip working is actually the location service built into the software. Unless they are transmitting in a completely different band GPS is practically useless indoors. Now with location services and AGPS you'll get a lock while indoors but the GPS chip is probably not doing much at this point.

I've got a Nook tablet without the GPS feature and I'm able to get my location from the wifi connection. It's not as accurate as a true GPS lock but good enough to get me information on the shops around me.