iPad 3G successfully shows me current location, but google maps are not re-calculating the route if I did not follow exactly initially suggested by it. Normal auto navigators re-calculate on the fly. CoPilot Live HD app I see in the app store has very bad feedback. Do you know any other that are better, please?

I need it with maps for the continental U.S., and being able to re-calculate depending on my real current location. I'd be OK even if it won't do that automatically, — I'd tap some button.