How "sensitive" is the sensitivity? may have adjusted it one or two points, but I know I didn't make any radical adjustments. You think just a little extra would do that? I seem to remember the "DI enhance" setting only making all those marks a little less evident, although still there. That was my first thought, the sensitivity.. It didn't remove all those marks though. That lake is 60 feet at its deepest. I'm usually in 40 or less. I'm headed out friday or saturday and I'll play with it some more. Thanks for the reply.