Humminbird Helix 7 Gps Chirp Si G4Entry HELIX 7, 7" screen adds Side Imaging (standard SI, not MEGA) plus CHIRP + GPS. Cheapest HELIX 7 and the step up from HELIX 5. Humminbird HELIX 7 CHIRP GPS SI G4 The Humminbird HELIX 7 CHIRP GPS SI G4 is the entry point of the HELIX 7 tier, priced at $599. It adds Side Imaging (SI) to the HELIX 5 CHIRP DI GPS G3 feature set, and steps the screen size up from 5" to 7". This is standard Side Imaging, not MEGA Side Imaging. For MSI, step up to the