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 event he smallest sonar return may be of interest to the user.
The 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 the 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
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
The 300TX automatically adjusts the depth range depending on the depth of the water. The unit tries to maintain the bottom depiction about 2/3 down the total range (for example, in 20’ (6m) of water, the
The Depth Range can be adjusted manually. Press MENU repeatedly until the Depth Range menu is visible. Two options are available: Auto and Manual.
The manual setting enables you to adjust the current depth range setting. The unit no longer adjusts the Depth Range to the most appropriate range for bottom display. Often, the bottom may not be visible
Using manual Depth Range control, you can view sonar information from the area near the surface in great detail.
To return to automatic Depth Range control, press the MENU button until the Depth Range menu appears on screen and use the UP ARROW to select AUTO.
