Includes dual-beam transducer with Garmin Chirp traditional sonar for crystal-clear images and remarkable target separation Built-in Garmin quickdraw contours mapping software lets you create and store maps with 1’ contours for up to 2 million acres Built-in GPS lets you mark waypoints, create routes and view boat’s speed Bright, Sunlight-readable 4.3” display and intuitive user interface Rugged design for every fishing environment The STRIKER Plus 4 fishfinder with a bright 4.3” display and built-in GPS features CHIRP sonar for crystal-clear images and Quickdraw Contours map drawing software, which stores up to 2 million acres of content with 1’ contours. The built-in GPS lets you mark and navigate to waypoints and shows your boat’s speed.