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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 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 0-15’, 0-30’, 0-60’, 0-120’, 0-
180’, 0-240’, 0-350’, 0-480’, and 0-600’ are available. In the metric version, ranges of 0-
5, 0-10, 0-20, 0-40, 0-60, 0-80, 0-110, 0-150, and 0-185 meters are available. The
range that positions the bottom depiction closest to the bottom of the screen, will best
utilize the availability display resolution.
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 0-30’ (0-10m) range would be selected). This
provides the best display resolution and therefore the best target separation possible.
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 on-screen. The digital depth readout
always determines the depth of the bottom, even of it is not on-
screen.
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.