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Several of the menus are multi-step. In some situations if an adjustment is
made, additional options become available for further adjustment. Examples of
these multi-step menus are Depth Range, Depth Alarm and Zoom. See the
detailed description of each function for further explanation.
Menu Functions
Sensitivity. The Sensitivity function controls the
sensitivity of the sonar receiver. The
405SX
automatically adjusts the level of receiver
sensitivity based on a number of factors including
the depth of the water and the level of noise
present. Noise can be caused by other electronic
devices, engines, trolling motors, propeller cavitation and hydrodynamic flow
among others. The user has the option of adjusting the Sensitivity higher or
lower based on personal preference. You can select one of 11 sensitivity
settings from -5 to +5. A setting of 0 (factory setting) has no effect on the auto-
matic sensitivity control. Increasing the sensitivity
(+1 through +5) enables the unit to display the information from progressively
smaller sonar returns. By decreasing the sensitivity (-1 through -5), the unit
effectively filters small sonar
returns.
In murky or muddy water, it is
often helpful to reduce the
sensitivity. This prevents the
display from being cluttered
with sonar returns from debris
or suspended particles. In very
clear or very deep water, it may
be helpful to increase the
sensitivity since even the
smallest sonar return may be of
interest to the user.
To adjust Sensitivity, press MENU repeatedly until the Sensitivity heading is
displayed. When the Sensitivity menu appears, use the UP ARROW to increase the
sensitivity, or the DOWN ARROW to reduce sensitivity. To sequence through the
available settings, press and hold either ARROW button. Release the button at the
setting you want to select.
15
USING THE 405SX
MENU FUNCTIONS
High Sensitivity (+) Sensitivity at “0”
Low Sensitivity (-)