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. Adapter connects your Humminbird HELIX 7 G3, G3N, G4 or G4N fish finder with a built-in MEGA Down Imaging transducer or a built-in Dual Spectrum CHIRP transducer on your trolling motor.