Can you post a picture of the problem?
I have the Elite 5 CHIRP and see no noise:
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You say scupper area, do you mean the Lowrance ready mount? If so, be careful that the Lowrance ready cover and the transducer has a lot of space between as to not trap air bubbles. I actually cut my Lowrance ready cover out the shape of the transducer to minimize bubbles and prevent sand and debris from collecting on the cover.