Seeing double …

[sroof]

In Basecamp, I'm seeing two sets of many major roads. 
I've got City Navigator installed on a microchip in my Montana 600 and I've selected City Navigator as the "map product to display" in Basecamp.  But depending on the map detail setting and my zoom level, I see the roads from the "Global Map" layer in addition to the CN roads.  How can I make the global map not show up at all when I'm using City Navigator? (I'll still want to use the Global Map occasionally when I don't have the Montana plugged into the computer).

[Boyd]

This is a known bug in basecamp. The developers are aware of it through discussion on Garmin's forum: https://forums.garmin.com/forumdisplay.php?179-BaseCamp

My version is old and I don't use basecamp much anyway, so I haven't followed this. If you are running the newest version and still see the problem, then I guess it still has not been corrected.