It would be fun if GPSApp could be extended to display some additional vector lines surrounding the programmed route. Not an entire map of the region, just the lines representing the streets within a mile or so of the preprogrammed route. So that way, if you get off-course, you can see what streets to take to get you back on course.

I know MapsOnUs doesn't supply that information. But wouldn't it be cool if we could get like a Tiger dataset (or something similar), and have either the Python script on the PC or GPSapp itself on the player match up the Tiger data and the MapsOnUs route, and overlay them atop each other.