Not just yet, but there are a few applications that are working on Bluetooth beacon indoor navigation technology. This relies both on the user having the application and the location having the Bluetooth beacons installed. Keep an eye out for Sendero Products, as they were testing the Bluetooth Beacon functionality at the lighthouse here in San Francisco a few months ago.

In huge airports, in theory something like blindsquare gps might work. It takes the locations from foursquare.
But the last time i tried that at heathrow i think they had rearranged everything. The app kept telling me about places I don't think were there any more, or that i could find in the goven distance and direction.
Although it should work when there are ibeacons that are properly set up...

Some of my friends use ariadne. Maybe that's another alternative.

Yea, it would be nice to get indoor locations of stuff in places like airports, malls, giant offices, hospitals etc.

There is also indoor wifi way finding products but none of them have seemed to be ready for the market yet.

This is supposed to be one of the advantages of Galileo, that it can penetrate into buildings. It isn't functional yet though.

There is not. GPS does not function indoors (okay, it might a little but in a large building no way). Apple's iPhone and bluetooth iBeacons are there ready for someone to build a system like this but no one has invested in it, sadly.

I have not heard of such. the issue with GPS in a building is someone would have to create the map like Google does with street view. There is a theatre in Ontario that has an app and uses Bluetooth beacon to guide the blind.