Free Customizable and Routable Maps for Garmin GPS Receivers

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This site lets you build and download routable maps for Garmin GPS receivers. It uses maps from Open Street Map. I've been too cheap to buy City Navigator, so I am going to give this a try and report back on how it works for me.

Know of any other good sources for routable Garmin maps? Let me know in the comments!

Mac users - If you get a long beep and your unit locks up after installing custom map files, there are hidden files that need to be removed. Read this article for details.