New owner of a Dakota 20. I discovered this great website and loaded MO Topo and My Trails into BaseCamp then onto a card and everything worked fine. I then loaded the IL Topo and WY Topo into Basecamp and onto the Card. When I fired up the Dakota again the only map available was the IL Topo which was the last one I loaded onto the 16 GB micro SD. Would appear each time I load a map it overrides the existing map. Assume I am doing something wrong and would appreciate some help.