My chart plotter has slots for two cards, and the G2 Vision maps don't over all of the areas I boat. I am in the Boston region. The 511L charts cover all of NY, CT, and RI but stop halfway through Cape Ann (Gloucester/Rockport MA) which is a common boating area. VUS003R covers all of MA and RI but not CT or NY for when I travel the Long Island sound. Does anyone know how the system will handle both maps being installed or the 510L and 511L as it would cover most of the east coast and further than I would be boating.