I've been rolling out a Call of Cthulhu game which begins in Arkham. I pretty much lay down track right before my players arrive. I had to resist the temptation to clean it up so you can see what my real mapping looks like.
We've been playing via Google Hangouts and, by using Sharescreen and Photoshop, I can pan the 'camera' along with the players' moves. In this case, the players were driving through a neighborhood at night.