I have noticed that the "direction cone" in the Maps app sometimes changes its acuteness: sometimes it will get wider or narrower. The cone seems to represent some sort of accuracy/confidence. I'm particularly interested in what factors (environmental?) alter it.
What causes this? (or am I just imagining that it changes at all?)
(To be clear, I'm talking about the Maps app that is pre-iOS 6; the one that uses Google Maps for its data source)