If you already own a laptop and are in need of a GPS solution you can pick one up on the cheap in the form of Microsoft Streets and Trips 2007 which now includes an GPS antenna giving the software full moving map capabilities.
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That said the guys over at Everything USB didn’t like it much saying that is isn’t ready for the road. Interestingly I reviewed the same product and found it to work quite well albeit not on a cross country trip. To each their own I guess.Review excerpt: “Streets & Trips has two main ways of figuring out your position. The first and least-used way is to attain your general position by looking at the available hotspots within range. As you can imagine, this is hardly ideal for areas without municipal WiFi, due to the fact that Microsoft most likely isn't driving around residential areas plotting everyone's wireless router.”