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I don't think you will find a Garmin map because Garmin uses a map locking system that resticts where maps can be installed, I would suggest that you install Garmin Basecamp onto a computer and then select a free map based on Open Street Maps, these can be installed onto the computer and viewed using Basecamp, then use the map install option in Basecamp to select a map (or a smaller part of the map) and send it to your 2820, it will allow you to examine the memory space on your 2820 and create more space by erasing old maps if required