Humminbird SINGLEBEAM 405SX, Operation Manual

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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 if it is not
visible on-screen.
Using manual Depth Range control, you can view sonar information from the area
near the surface in greater 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 405SX 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 for
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' depth range,
TruZoom displays a range equal to one half the
current depth range. In the 30', 60', 120', 180',
240', 360', 480' and 600' 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.
The 405SX shows Zoom range in conjunction
with the full depth range. The Zoom range is shown on the left side of the
screen and full range information is shown on the right side of the display. The
area which is being enlarged by Zoom is indicated by the square box. Zoom can
either operate automatically, in which the Zoom range is constantly adjusted to
show the bottom, or manually, in which the user controls the location of the
Zoom range.
17
USING THE
405SX
MENU FUNCTIONS