Originally Posted by renogeorge
You can use CN from an SD card on your computer in BaseCamp and Mapsource. BUT you must have the CN SD loaded in your GPS and connected to your computer.
I have tried that with Mapsource but it was not able to access the CN maps on a uSD card in my Montana. There was no problem with Basecamp. Have you actually connected to Mapsource and have it access the CN maps on a uSD card in a gps?