Most of the GPS software that comes with the major manufacturers are proprietary to the manufacturer. Myself, I recommend iGuidance v4. It installs on a Laptop, UMPC or Windows Mobile. Supposedly you can get some chinese deck that runs on the WinCE 4.2 platform and install either iGuidance or TomTom 6.

example: http://cgi.ebay.com/Car-DVD-TV-Bluet...sid=p1638.m118