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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 al-
lows you to tell the difference between a hard and soft bottom. For ex-
ample, 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 with-
out, then the target with gray is the stronger signal. This helps distin-
guish weeds from trees on the bottom, or fish from structure.
Grayline is adjustable. The factory default for this unit is 69 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.
At left, Grayline menu screen. Center, little Grayline indicates a soft
bottom, probably sand or mud. At right, the wider Grayline indicates a
harder, rocky bottom.
Wider
Grayline
Thin or no Grayline
39


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