I'm also quite interested in the NAV project, and I'll help out in whatever way I can (How much do you want? What are your expenses going to be for the project?). I know that getting recent, detailed maps in the right vector format is one of the hard parts for developing a nav system, so if you need test data, my fraternity brother/roommate works in GIS and said he could get me vector maps from the local Sherrif's Department. Using ARCview, he can put them in whatever format you want.
Jason

_~= Dearing =~_
"WAY too happy about having #99."