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To adjust sensitivity:
Press
MENU
until the
S
ENSITIVITY
A
DJUSTMENT
menu appears. Press
UP ARROW
to increase the sensitivity,
DOWN ARROW
to decrease
it. When it's set at the desired level, press
PWR
to clear the
menu.
The sensitivity percentage in use shows in this menu. As you
change the setting, echoes scrolling onto the screen will show the effects of
the change. If you reach the maximum or minimum sensitivity level, a tone
sounds alerting you to the limits.
NOTE:
If you want to change the sensitivity in Manual Mode,
first turn off Auto Sensitivity: press
MENU
until the
S
ENSITIVITY
A
UTOMATIC
/M
ANUAL
menu appears. Press
DOWN
ARROW
to select
M
ANUAL
, then press
PWR
to clear the menu.
To adjust the sensitivity, follow the same steps used for
adjusting sensitivity in auto mode above.
GRAYLINE
®
Grayline
lets you distinguish between strong and weak
echoes. It "paints" gray on targets that are stronger than a
preset value. This allows you to tell the difference between a
hard and soft bottom. For example, a soft, muddy or weedy
bottom returns a weaker signal which is shown with a
narrow or no gray line. A hard bottom returns a strong
signal which causes a wide gray line.
If you have two signals of equal size, one with gray and the other
without, then the target with gray is the stronger signal. This helps
distinguish weeds from trees on the bottom, or fish from structure.
Grayline is adjustable. The factory default for this unit is 72 percent.
Since Grayline shows the difference between strong and weak signals,
adjusting the sensitivity may also require a different Grayline level.
The level chosen by the sonar unit at power on is usually adequate for
most conditions. Experiment with your unit to find the Grayline setting
that's best for you.
To change the Grayline level, press
MENU
until the
G
RAYLINE
menu appears.
35


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