You could just buy Autoroute 2010 bundled with the Microsoft GPS receiver. Even the full bundle is pretty cheap. And if you want to get started planning while you wait for the product to be shipped, you can download the free trial of Autoroute and start using it right away.
It works full-function for sixty days. If you want to keep it working you just enter the activation code (Product ID) that comes with the package when it arrives and you don't even need to reinstall it.
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