Humminbird 425 SX Operation Manual page 18

USING THE 425SX
MENU FUNCTIONS
The user has the option of
High Sensitivity Sensitivity at "0"
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
automatic sensitivity control.
Increasing the sensitivity (+1
through +5) enables the unit to
display the information from
progressively smaller sonar
returns. By decreasing the
Low Sensitivity
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.
After an adjustment is made, the menu disappears and the new sensitivity setting
is in affect. If additional time is needed to study a menu, press and hold the MENU
button and the menu will remain on-screen indefinitely. If you need to make an
additional adjustment, press the UP ARROW or DOWN ARROW button.
Depth Range. The Depth Range function controls the vertical distance displayed
on the graphic area of the display. There are nine depth ranges available. The top
of the range is always 0, or the surface of the water. Ranges of 0–5, 0–10, 0–20,
0–40, 0–60, 0–80, 0–110, 0–150, and 0–185 metres and imperial ranges of
0–15', 0–30', 0–60', 0–120', 0–180', 0–240', 0–360', 0–480', and 0–600'.
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