Garmin Striker Plus 4 fishfinder has 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 and create routes and view boat’s speed, bright sunlight-readable 4.3-inch display and intuitive user interface, rugged design for every fishing environment.