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Hi Ryan, you wont need to purchase another map. Whats happened is, with the older models of garmin they cant hold the entire US map at once, so the garmin breaks the maps up into regions. So what you need to do is connect your garmin to a pc, install garmin express, and then change the map region, to a region that includes the state of Minnesota.
This link will guide you through the process.
If you get st uck or run into any issues, let me know.
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