I just returned from Washington, DC and although the app launches fine I found it was not able to identify local points even when they were direcly across the street from my location. What is odd about that is that the app can locate the small family restaurants in my Dallas suburb. I would think it would be the opposite.
All in all an interesting app and will probably be useful from time to time but needs a bit more reliability on locating points.
Using a Lumia 900 on AT&T.