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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 onscreen. The digital depth readout always determines the depth of the bottom, even if it is not 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
Zoom. The 400TX uses a greatly enhanced Zoom capability called "TruZoom" which offers expanded information on a select area of sonar information. Zoom is similar to Depth Range because it controls the range of information displayed on screen. Zoom, however, allows selection of ranges beneath the surface so any area of water between the surface and the bottom can be enlarged to provide more detailed information. By using the full display to show a small area of coverage, the effective display resolution is increased, and the unit's ability to separate close targets is enhanced.
The Zoom ranges available are dependent on the current depth range. In the 15' (5m) depth range, TruZoom displays a range equal to one half the current depth range. In the 30' (10m), 60' (20m), 120' (40m), 180' (60m), 240' (80m), 360' (110m), 480' (150m) and 600' (185m) depth ranges, TruZoom displays a range equal to one fourth the current depth range. The box at the right side of the screen outlines the area to be zoomed.