He said "You should be aware that maps are not transparent, and there's a hierarchy which determines which map is on top, hiding details of other maps". Again the maps are not transparent, you only see the map on top and he then gave the Hierarchy list (been looking for that, thanks). Only map on top shows, there is no reason to have any other maps turned on. It slows drawing for it to draw one map then over draw the next map. I could see this in old 76. Assume you mean Off Highway, there are not roads when off road. Amost all dirt riders do not ride with Topo on, too many lines (more do with big screen montana than hand helds). City Nav works for most good roads, if you want single tracks in USFS, try finding old copy of Roads & Rec, it has a lot of trails from 80s.