Another enhancement idea:

Right now, the location of the current position on the display is selectable (middle or 75% IIRC). For straight roads this works fine, but elsewhere, this could do better.

How about a nifty way to locate the current position such that a maximum of the route ahead is shown on the screen? Maybe it could select between 5 positions (center + 75% towards each edge) depending on where the route is going...