In a bit of genius or craziness, I decided to combine two open source programs- our well loved GPSApp with a little program called Roadmap. Roadmap is a cool little program that uses TIGER map data (built into a special format) for displaying maps. After a bit of struggling and applying chewing gum I made them work together. Download it here! See the Installing.empeg file on how to install and download maps etc..
Please note this little hack is in v0.01 and I'm not even sure of it's usefulness yet. It does show maps of roads and such when you drive by however. Comments are appreciated, bugs are expected. (Screenshot attached)