This is what I think. Even though I have no idea where any of the towers are in the Bronx. My theory (firmly rooted in conjecture and wild speculation) is that it always tries to triangulate. But that when Gmaps states "my approximate location to within 5000 meters" it is locking to one tower. And when it states "my approximate location to within 1700 meters" it's using triangulation. Just a guess. What do you all think?