Since nobody commented on gathering GPS data from the US for testing the maps suitability for the purpose, I start to wonder how many people out there would even be able to test the software if one would be available.

What exactly do you need? Long and lat for a few intersections or something more detailed? I have a NMEA capable GPS, plenty of linux knowledge, two empegs, and I really want to see this project happen. I am not particularly familiar with mapping software and I can't really do much with C code beyond compiling it, other than that just let me know what you need.

-Mike