City Navigator in BaseCamp?

Former Member
Former Member
I have Garmin Edge 820 and bought the City Navigator Europe NT maps. I downloaded the maps to the 820 and when connected to my Mac the maps show up on the device in BaseCamp. What I'd like to do is use the CN maps in BaseCamp without the Edge connected.

How can I copy the CN Europe over to BaseCams so that I can plan my trips without the 820 connected to my Mac?