Oh, I forgot another issue. So the navigation is built around Streets and Trips 2006 from Microsoft. 2008 is almost out (August 20th), and 2007 has been out for a while, but the developers currently have no announced plans for how upgrades will work. Trying to upgrade yourself results in the navigation being broken. So while most proper navigation units have yearly updates of some sort available, Streetdeck offers 2 year old information.
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Tom