What do these points actually represent? Mine shows a tremendous number of points in the regions where I've lived and been, but no points within about 1/4 mile of where I actually live and I have definitely used the GPS there. Also it shows some points near Las Vegas, which I'm pretty sure I haven't been to with iOS 4.

Some points even show up in the middle of the San Francisco Bay, which doesn't make sense if this is showing cell towers.