My Lowrance sounder/plotter has an SDC 38Mb card for the east coast of britain fitted, but I can't zoom in to any detail of the coast line. What do I need to get a zoomed in map of the north east coastline, showing areas in greater detail. Do I buy another SDC card, if so, how much should I be paying, and where from, or can they be down loaded from the computer onto my existing card:question:. Never was very technical
