Lowrance Hook-7 Sonar/GPS Mid/High/Downscan Navionics+ Fishfinder Lowrance-exclusive, brilliant, high-resolution, 7 inch , color display CHIRP sonar plus downscan imaging combined to provide the best possible view beneath the boat Highly accurate, built-in GPS antenna plus a detailed U.S. Map featuring more than 3,000 lakes & rivers & coastal contours to 1,000ft Optional Americas chart upgrades include Lake insight & nautic insight Pro & HD, navionics hotmaps premium & fishing hotspots Pro Global chart upgrade options include navionics + & jeppesen c-map max-n