Need an MDI Cable adapter? Check out the Minn Kota 1852086 MDI Cable Adapter for Hummingbird HELIX 7. MEGA imaging uses high-frequency sonar so you can easily distinguish fish from structure, see the direction fish are facing and even target individual species. And now with MEGA Imaging+, you'll be able to scan deeper and wider without sacrificing clarity. This adapter connects your Hummingbird HELIX 7 G3 or G3N fish finder with a built-in MEGA Down Imaging transducer on your trolling motor.