Keypad control: Master HELIX at the touch of a button. Access the pre-loaded views from the user-friendly menu system, operated by softkey controls that allow you to reliably operate your fish finder in any conditions.CHIRP Down Imaging: Filter out noise and clutter for a clear view beneath your boat. CHIRP Digital Sonar processing of Down Imaging Sonar means that you'll see great detail to make finding the fish simple and easy.Dual Spectrum CHIRP sonar: Before you cast, know what's down there thanks to highly-detailed fish arches and a clear view of fish-holding structure and the bottom. Powered by our proprietary, Low-Q CHIRP transducer, Dual Spectrum CHIRP 2D sonar offers two ways to search; Wide Mode for maximum coverage and Narrow Mode for focusing on the slightest detail.Internal GPS and Humminbird Basemap: Our enhanced basemap provides you with a clear view of underwater terrain and surrounding points of interest so you can fish and navigate with total confidence. Identify buoys, day markers, hazards, marinas, contours, depth markers and much, much more. Includes charts of more than 10,000 lakes, plus coastal coverage for the continental U.S.Premium Chart Compatible: Humminbird provides the most complete offering of premium chart options to anglers everywhere. Get a complete view of the world below with optional charts from Humminbird's LakeMaster and CoastMaster products, as well as your choice of compatible Navionics charts.AutoChart Live: Create real-time maps of your fishing spots, with access to patented Humminbird LakeMaster features. Map depth contours, bottom hardness and vegetation as you drive your boat. Comes standard with eight (8) hours of built-in recording time and is compatible with AutoChart Zero Line SD cards for virtually-endless AutoChart Live mapping capacity.Includes control head, transom-mount transducer, power cable, gimbal mounting bracket and mounting hardware.