> Indeed, if that location data's GPS, it can get pretty distorted in the city. Especially if there's a lot of thick cloud coverage.
No, city GPS readings tend to be either plausible or nonexistent. Most receivers are able to detect absurd apparent positions created by building reflections (they do it by comparing different combinations of satellites and accepting the majority result).
Wet forest and country road, yes -- big problem for GPS. City driving, no, no really. And cloud cover doesn't significantly affect GPS performance:
