Garmin Striker Plus 4 Dual BeamThe 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 boats speed. The STRIKER Plus 4 fishfinder includes Garmin CHIRP technology for a higher level of clarity and detail that you have come to expect from