Nobody knows the waters you fish better than you and your fellow fishermen. The built-in GPS lets you mark and navigate to waypoints and shows your boats speed. Garmin Striker Plus 4 is a GPS Fishfinder with a bright 4.3-inch display and dual-beam transducer. While you are trolling the shorelines and the depths, Quickdraw Contours mapping software creates HD fishing maps of the places youve been. It features CHIRP sonar for crystal-clear images and Garmin Quickdraw Contours map drawing software, which stores up to 2 million acres of content with 1-feet contours.