But GPS didn't provide real-time traffic estimates, public transit arrivals, and similar information which can't be calculated ahead of time. And while somethin

But GPS didn't provide real-time traffic estimates, public transit arrivals, and similar information which can't be calculated ahead of time. And while something like satellite view and/or street view could be pre-downloaded, that would be a ton of data. Predownloading also wouldn't work for webapp users. I suppose you could make the blocks a lot coarser though.