Depending on where you live geographically there are open source solutions for GPS. Alternatively, take a look at what Timekiller has done with iGuidance in this post with video.I dont know much about linux but I can work a bit with ubuntu etc.
Now i like the idea of car linux. But are there any software packages for gps? Maps etc. So is there an opensource gps software package tomtom like?
Which package Linux ICE will include is still being debated but when it all comes down to the line, it may include several different open source GPS solutions.
PS +1 for ubuntu!