Originally Posted by
BobL
I work for BPS in marine electronics, and we run into this pretty often. The US2 transducer is designed to only work with 2d sonar, and it does ok with older 2D units. But what you're seeing is typical with newer units with down imaging. Not much you can do other than mount the Helix transducer on your Terrova, which is a pain. A company called Cornfield Crappie has a kit designed for the Terrova that I hear works pretty good. By the way, I had the exact same issue on my own boat. Ended up leaving my old Garmin 500C on the front. Put the new unit on the console on a swing arm mount.