Humminbird 400TX Fish Finder User Manual


 
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 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.
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.