Humminbird Helix Depth Finder Helix Depth Finder - Control Head Only The HELIX CHIRP MEGA DI+ GPS G3N CHO (Control Head Only) Fish Finder features MEGA Down Imaging+ and Dual Spectrum CHIRP Sonar. Includes GPS mapping, built-in Bluetooth, Ethernet networking capabilities and ability to create your own maps in real-time with AutoChart Live's depth, vegetation and bottom hardness mapping. Humminbird Basemap cartography is built-in, with the option to expand your mapping capabilities with available LakeMaster charts. This is a Control Head Only unit.
