garmin striker plus 4 dual beam transducer chirp sonar gps quickdraw contours bright displayThe striker plus fishfinders continue to deliver industry leading sonar that provides crystal clear images and built in gps, letting you mark waypoints, navigate back to them and view your boats speed. The fishfinders feature quickdraw contours mapping software and built in wi fi. Quickdraw contours software lets you create and store up to 2 million acres of maps with 1 contours. Use the built in wi fi to access the activecaptain mobile app for smart