I live in a large metro area. "Inside" the metro, VZNavigator works very well in locating its true position. However, to the West of me there is no data service available. When driving near (but not in) this "data deadzone" area, the VZNavigator begins to report very large errors in position. My guess is 500-1000 feet off. However at the same locations, BB Maps can still accurately show the correct position, so it is not satellite access that is the problem.
