Humminbird 425 SX - Manual (Page 17)

After an adjustment is made to a menu function, the menu times out after a few
seconds and the unit returns to normal operation.
Menu Layout. All menus use the same basic layout. The heading at the top
describes the menu function. The UP ARROW and DOWN ARROW symbols to
the left of the menu indicate which buttons are available for adjustment. In
menus that have several possible settings, 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 is the
selected setting. Press an ARROW button while the menu is displayed to select
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 425SX 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.
15
USING THE 425SX
MENU FUNCTIONS
Heading
Up Arrow Option
Down Arrow Option
Arrow Symbols
Selected Setting
Range of Adjustment Indicator