GP1670F_1870F Operator's Manual - Furuno USA

7. FISH FINDER OPERATIONSTo adjust the shift, open the full RotoKey menu then select[Shift] to show the [Shift] window. Turn the key clockwise to increasethe shift, counterclockwise to decrease the shift.7.6.3 How to adjust the gainThe gain controls how echoes of different strengths are displayed.Set the gain to show a slight amount of noise on the screen. Increase the gainfor greater depths and lower the gain for shallow waters.Gain too high Gain proper Gain too lowCAUTIONAdjust the gain correctly.Incorrect adjustment can lead to adangerous situation if the boat is steeredaccording to the depth indication.To set the gain, open the RotoKey menu then select [Gain 50 kHz] or [Gain 200 kHz]to show the [Gain] window. Turn the key clockwise to increase the gain, counterclockwiseto decrease the gain. 100 is the maximum gain.7.6.4 How to reduce clutterLow intensity “spots” of noise appear over most of screen like in the illustration shownbelow. These spots of noise are caused by sediment in the water or noise.To reduce clutter, open the full RotoKey menu then select [Sensitivity] and [Clutter] toshow the [Clutter] window. Turn the key clockwise adjust the clutter. Clockwise rotationincreases the clutter reduction.7-10