NON-NETWORKING WITH MEGA IMAGING: MEGA Imaging provides sonar coverage under your boat up to *200' / 60m with MEGA Down Imaging. (Available on select HELIX G4N models) Dual Spectrum CHIRP: With a powerful Low-Q CHIRP transducer, our Dual Spectrum CHIRP sonar provides crystal-clear returns, exceptional target separation and amazing fish arches. Can reach depths of 1,200 ft with the standard transducer or 3,500 ft (with optional 50 kHz tansducer)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.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.Keypad Control Master: HELIX at the touch of a button. Access the preloaded views from the user-friendly menu system, operated by soft key controls, allowing you to reliably operate your fish finder in any conditions.Built-in U.S. Basemap: Buoys, day markers, hazards, marinas, contours, depth markers & more. Charts of 10,000+ lakes, plus coastal coverage for the U.S.