I have a Colorado 400c. After downloading Topo U.S. 2008 onto my SD card, I am unable to view the BlueChart maps that came preloaded on the unit. I can see options for both maps under the Maps shortcut/ Options/ Select map -- but no matter what I select I don't get the BlueChart maps, even if I take the SD card out of the unit.
I appreciate any ideas you might have to fix this.