Menu Functions; Sensitivity - Humminbird 100SX Single Beam Operation Manual

and DOWN ARROW symbols to the left of the menu indicate which buttons are available for
adjustment. In menus which have numerous possible settings such as depth range, a range of
adjustment indicator shows the total range available and the current setting. Within the menu are
the options available. The selected option or current setting is highlighted in the black box. If no
adjustment is made, this will be the selected setting. Pressing one of the ARROW buttons while
the menu is on-screen selects another option.
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 100SX 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.
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 bias, or the DOWN
ARROW to reduce sensitivity bias. By holding either ARROW button depressed, the unit will
sequence through the available settings until you release the button or the end of the adjustment
range is reached. If additional time is needed to study a menu, press and hold the MENU button
and the menu will remain onscreen indefinitely.
The user has the option of biasing
this Sensitivity adjustment either higher or lower based on
personal preference. You can select one of 11 sensitivity bias
settings from -5 to +5. A bias setting of 0 (Factory Setting) has
no effect on the automatic sensitivity control. Increasing the bias
(+1 through +5) causes the unit to display the information from
progressively smaller sonar returns. By decreasing the
sensitivity bias (-1 through -5), the unit effectively filters small
sonar returns.
In murky or muddy water, it is often advantageous to reduce the
sensitivity bias. 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 desirable to increase the
sensitivity bias since even the smallest sonar return may be of
interest to the user.