Your ICE Flasher Series™ Fishfinder uses selectable dual-frequency sonar with a wide area of coverage. Selectable dual-frequency gives you the option of two beams, and both beams will cover the bottom and provide high definition. The 9 degree center beam provides the highest definition, while the 19 degree beam provides wider coverage. Depth capability is affected by such factors as bottom hardness, water conditions, and transducer installation. Whether fishing in shallow to very deep water, in both fresh and salt water, selectable dual-frequency is ideal for a variety of conditions.