I have zero interference with my x4, I run a garmin at the helm with a thruhull transducer mounted midship, and a garmin mounted at the transom with that transducer mounted directly on next to the x4 ducer on the transom. I think people could have other possibilities as I was told fish finders should never interfere with the hawk readings. I would start with checking for proper grounding to the water and such. Making your stories, Reel Stories, since 2011!!