I'm assuming it's in manual mode? We run dual frequency all the time and just this past weekend a lot was showing up on 200 and almost nothing on 50. I adjust the gain as high as I can without getting distortion and continually check it with varying depth when I'm on the bridge. It seems like we always get marks at the same depth level and that alone strikes me as odd. Maybe a thermocline? Maybe fish are there but we are always marking crap at around 200 feet it seems like. It happens too much to be coincidence I think but maybe I'm wrong.
I guess I need to double check the manual setting?
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