The Humminbird HELIX 7 CHIRP MEGA DI GPS G4N CHO helps you catch fish anywhere and gives you a deeper understanding of what's below the ice. It has highly-detailed fish arches and a clear view of fish-holding structure and the bottom. The Dual Spectrum CHIRP 2D sonar offers two ways to search, Wide Mode for maximum coverage and Narrow Mode for focusing on the slightest detail. Their 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. It Includes charts of more than 10,000 lakes, plus coastal coverage for the continental U.S. It has High-speed Ethernet allows you to build a powerful, professional-grade fishing system. This fishfinder comes with bluetooth technology and built-in NMEA 2000 networking. The MEGA Down Imaging is used to get unprecedented underwater clarity with coverage down to 125 feet below your boat.