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Can a bad SI transducer (transom mount) effect the thru hull transducer reading at high speeds? I also get a ton of interference now on the graph at high speeds where I never used to.
Which units do you have? It may be your thru hull may of come loose. Do you manually switch from SI to in hull? The new update for the 800 900 1100 series took away the automatic settings have you installed the 6.1 updates.
I have the 898C. I do not have to manually switch it. I was told it switches to the hull automatically at 5mph or so. I just looked, I am still on the 5.7 Version Software. The thru hull transducer seems to be solidly affixed to the hull still. I wonder if the unit uses the thru hull for the 2D at speeds below 5mph? If it does it might make sense that the thru the hull transducer is the problem.