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I'd advise you to check into the various comercial mapping programs. Does roadmap do routing yet? I've got a Mobilecrossing Waypoint, and it's at the same time really easy to use and nearly impossible to use while driving. RoadMap on the empeg at least is a great hack, but it's not really usable.

As to the car battery, I suspect it'd power the WAP for a while without a problem, someone else can probably do the math for you.



Don't know any commercial mapping programs that would support using GpsD as a GPS data source, so that would require me getting a bluetooth gps and giving up using any GPS applications on the empeg. Roadmap doesn't support routing yet and probably never will support on-the-fly point-to-point routing because of the one-way and intersection information that is missing in the TIGER map data it uses (some are working on other map sources though).
That said, I've had it in my mind to add GPSApp's routing paradigm into Roadmap (i.e. use Google maps to create the route, then display your pre-created route with directions), so maybe this would be a good catalyst for that.