Gary, I've purchased a lake map for my C330. It has all the buoys needed to navigate on water. I can upload the map and it shows up as a large rectangle over the lake. I cannot see the buoys and was told I need to shut off the map that came with the GPS. I also found a reference to this in the mapsource software for overlapping maps. I cannot find any documentation in the user manual on how to shutoff different maps. HELP?
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It worked! Thanks
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