I have been getting some strange readings on my Helix 9 sonar unit at the front of my boat. From time to time I see two lake bottoms. One at the proper depth and another about twice as deep. Head reports the deeper depth in the info corner. For instance, I am in 12 foot of water. I see the bottom at 12 foot, but I see another bottom at 24 foot, and the readout shoes depth at 24 foot. I adjusted various settings, but none seemed to permanently rectify the problem. Any advice from the group?


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