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Sorry, kinda new to this.  I have Garmin Mapsource, Base Camp, an etrex20 and a few states of downloaded topo's.  I can see all the topo detail in both old Mapsource and Base Camp.  When I install the maps from BaseCamp to the GPS I get very little detail on the unit.  If I install from Mapsource I get all of the detail but I have to create 1 map with the states I want but it maxes at 4gig and I get 1 map (if I reduce the number of States to get below 4gig). You can't load multiple individual maps from Mapsource.  So what am I missing to get all of the detail from BaseCamp?