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I have a helix 9 G2 sonar/gps on my terrova. I am using the us2 transducer in the terrova. I have noticed that if I am in less than 10' of water, the depth reading often doubles. (Showing a false bottom. The digital read out is approximately twice that of the true depth.
When I get in to deeper water the image clears up and the digital read out is correct.
I have updated to the most current software on the Helix 9.
I received an email a reply/suggestions. When I went to the link it wasn't there. I suspect it was the duplicate post that I made that was deleted.
Turn your sensitivity down.
Also ..... if you don't have switchfire clear turned on, do so .... and if set the surface clutter to 6 or 7.
That is not really a faulty reading. It is a sign of a good unit. Lots of the folks like to use the double echos.
I don't know anything about the Helix, but I recognize the description you presented.