LtSmash, I have not gotten any feedback as to what these vertical lines are from. I will tell you this: while running in shallow water if you will switch your 2d graph to 83khz and your down scan to 800khz you will get a much clearer picture in which to desifer your bottom searching. As to the lines I have no clue as of yet, but am still searching for aswers.
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Eat, Sleep, Hunt and Fish (The Devil is in the details)
Dan Duncan