Humminbird LCR 4000 Operation Manual page 21

Humminbird lcr 4000: user guide
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When the (+) or (-) button is pressed
once, the sensitivity setting at the top
of the screen will change by one
division. If the (+) or (-) button is held
down the setting will move up or down
as long as the button is held down.
When the maximum or minimum
setting is achieved, the unit will make
a "Chirping" sound indicating a limit
has been reached.
In the manual mode everything below
the bottom is no longer blacked out,
therefore a second return or double
echo can be displayed if desired. (See
Figure 14). Also, the hardness of the
bottom can be determined by the
thickness of the bottom return. For
example, a hard or rock bottom will
give a wider bottom return as
compared to a soft or muddy bottom.
(See Figure 15).
USING THE LCR 4000
OPERATIONAL INSTRUCTIONS
indicating more sensitivity. In
shallow water or when a hard
bottom is being read, the
sensitivity needed to achieve a
good return will be less. Also in
the automatic mode, the unit will
black out the display beneath the
bottom line.
Manual Mode- There are two
ways of putting the LCR4000 in
the manual mode: (1) depress
the Auto "On/Off" button or (2)
depress either sensitivity
decrease (-) or increase (+)
button. You will notice that the
word Auto in the upper right hand
corner of the display has gone
off. The operator can control the
amount of sensitivity by
depressing the (+) or (-) button.
There are 15 sensitivity settings.

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