Humminbird HELIX 15 G4N Series Fishfinders feature a 15.4" display, Dual Spectrum CHIRP Sonar and internal GPS with Humminbird Basemap. Select models include MEGA Side Imaging+ and/or MEGA Down Imaging+. All HELIX G4N models include standard features such as AutoChart Live, Wi-Fi and NMEA 2000®, in addition to Bluetooth® and Ethernet networking for compatibility with the One-Boat Network™ family of products from Humminbird, Minn Kota and Cannon. 

Features:

• 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 that allow you to reliably operate your fish finder in any condition.
• MEGA Down Imaging (Select Models Only): Get unprecedented underwater clarity with coverage down to 125 feet below your boat. You'll unlock new details with up to 3X more fish-finding detail than standard Down Imaging sonar.
• MEGA Down Imaging+ (Select Models Only): Get unprecedented underwater clarity with Down Imaging coverage down to 200 feet below your boat. You'll unlock more fish and structure with 20% more detail and 60% more depth capability than MEGA Down Imaging sonar.
• MEGA Side Imaging+ (Select Models Only): See the world below like never before with a crystal-clear Side Imaging viewing out to 200 feet on either side of your boat. You'll unlock more fish and structure with 20% more detail and 60% more range capability than MEGA Side Imaging sonar.
• 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 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.
• One-Boat Network Compatible: Many Humminbird models seamlessly integrate and communicate with Minn Kota and Cannon products to unlock more features and capabilities for anglers everywhere. Make the more of your time on the water with the exclusive boat control and fish-catching features of the One-Boat Network. 
• Ethernet Networking: High-speed Ethernet allows you to build a powerful, professional-grade fishing system. Easily connect multiple fish finders, or upgrade to add-on technologies like Minn Kota i-Pilot Link and Humminbird CHIRP Radar.
• Bluetooth: Take control right from the screen of your Humminbird with wireless communication to compatible Talon and Raptor shallow water anchors, as well as Cannon Optimum downriggers. Additional features include wireless software updates from the Humminbird FishSmart App and display of smart phone notifications on your Humminbird. 
• NMEA 2000 networking built-in: Connect an accessory NMEA 2000 network to your control head for even more information; from boat performance to weather and water conditions, make sense of it all with NMEA 2000 networking.
• Includes control head, power cable, gimbal mounting bracket. Select Models include transom mount transducer and mounting hardware.
• 2-Year Limited Warranty