Does it work anywhere ?

Worldwide. It uses Google or OSM direction service to build a route.

I checked the app out under android and it is completely useless for me.

@Daniel Mutch
interesting how you've already tried it under android.... Its available on IOS now but they said it would not be available until February for android...

As the ticket written to the Google Glasses wearer in San Diego recently demonstrates, laws are in place that may place the user at risk of tickets. Automated vehicles should remove this obstacle as laws are changed.

Err. Brilliant, but as an android, I have to wait.

Sounds like a good way to cook your phone in a hot sunny area.

Ok, I downloaded the app and tried it....pure garbage.
* Even under dim sunlight (extremely overcast) it's almost impossible to see. * no voice prompts * does not try to recalculate your route if you get off course or even start somewhere that's not your original starting point.
Overall, neat idea but pure garbage.

For me, Google Maps on my smartphone works like a champ for navigation. I can usually find a spot to put the phone somewhere on the dash (business travel = rental cars), or I can just listen and follow directions. Not sure what benefit this adds.

This app is completely useless. It doesn't recompute your route and has no voice commands. I think that the best head up display navigation app with best Google Maps integration so far is Head-Up Nav. It's really easy to use.