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Message: <blockquote data-quote="whistler" data-source="post: 235838" data-attributes="member: 1086"><p>I've got an old Hummer also and I downloaded a manual for it.......read all about it. I thought I understood it. Watched the Demo mode go on and on for the longest time. First time out I got pic and screens that the book doesn't even have anything that resembles them. I know if I upgrade ........and I do want a DI unit, this problem will compound itself as everything is more complicated on those units. I think the dirty (colored) water we have in our rivers has some effect on the sonar return back to the transducer. Not like that nice clear bath water some of you guy have. :wink: Also I've heard people say aluminum boats have a negative effect them also?</p></blockquote><p></p>