Waymap" is like a form of Google Maps ...
... except for the visually impaired
Works indoors: It loads a map of where you are indoors, and uses pedometer-style tracking to determine where you are -- then gives directions in your earbuds
It only works if the indoor location has already been mapped, which is the catch
Interesting idea -- designed by a guy whose sight became significantly impaired later in life. I wonder if other folks would want to use it