The largest addition to Humminbird’s tried-and-true Helix lineage, the Humminbird Helix 15 CHIRP G4 Sonar features an expansive 15.4” display that allows anglers to take full advantage of Humminbird’s cutting-edge MEGA Side Imaging+ (select models), Mega Down Imaging+, Dual Spectrum CHIRP Sonar and internal GPS with Humminbird Basemap.