I have always turned my fish ID off on all my units regardless of make. After reading how Wayne used it. I decided to try it on my Humminbird Helix

7 G2 Sonar/Gps. No Si or DI. While fishing off of docks. The Helix 7 constantly revealed the fish on fish id. When it showed fish I caught them. When it didn't I twiddled my thumbs.