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I mounted the 60CSX via the interface/USB mass storage option, then navigated to the "Garmin" folder via windows explorer (you'll see the device as removable storage) and deleted the .img file that was added when I sent the mapsource map to the device. Worked like a charm. Didn't screw anything up. When I turned the unit back on it still had the basemap that came with it but my topo map was gone as intended.