I did not know the Helix had a noise filter built into the unit, I am having an issue with multiple vertical lines only when the TM is on. I am thinking that it is from prop wash since my 'ducer is located 30" to the side of my TM and they are on totally separate batteries.

I have not tried this yet plan on seeing if it makes any difference next week but below is a link from you tube explaining how it works.


YouTube