Garmin Fishfinder 90 with Dual-Beam Transducer Full-Featured Sonar With 4-Inch, 64 X 128 B&W Fstn Display Ultrascroll High Rep Rate Sonar Dual-Beam Transducer With Selectable Narrow (14 Ft) Or Wide (45 Ft) View For Maximum Freshwater Performance High-Dynamic Range, Analog Receiver Performs In Water As Little As 1 Ft Deep Autogain Technology For Visibility Of More Fish