Menu Functions

USING THE 250DX

Menu Functions

Sensitivity. The Sensitivity function controls the sensitivity of the sonar receiver. The 250DX automatically adjusts the level of receiver sensi-

tivity 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 automatic sensitivity control. Increasing the sensitivity (+1 through +5) enables the unit to display the informa- tion 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 helpful to reduce the sensitivity. This prevents the display from being cluttered with sonar returns from debris or sus- pended 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 change.

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.

High(+) Sensitivity Low(-) Sensitivity

Sensitivity at “0”