OK, I gave it a try, turned everything off except for what you suggested. I cant find anything on there, even stuff i know is there. Pretty much most of SC and NC is smooth bottom according to that chart. Do you know what the numbers by themselves mean? It sure isn't depth. Man you got to be careful with the zoom. I need a 48 inch screen to navigate it. i messed with it long enough to get a headache. I may try it again later but could really find anything other than the big drop offs and holes way out. I couldn't find any wrecks or reefs. I may be doing something wrong
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