It's already been done, its not worth it. The mapping
software that we use in PC and Car generally baught map/data from a different company, most likely "Navteq" then programmers plug the maps, they baught, in to thier software.
Check This Out
That link brings you to an active x control, designed to show raster based maps. You can buy the control... all you need it raster based maps.
Check Here For maps
Generally, the maps we all use weather thier in PC,PDA,WEB BASED,CAR
NAVIGATION are all the same they come from the same place, the only difference is the software running on top of the maps...
And yes, there is converstion software already design... Check out the US GIS (Geographic Infomation Service, I think ?) web site, they have a software development section that explains in DETAIL how to convert these maps.
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