Grayline - Lowrance X37TX Installation And Operation Instructions Manual

To adjust sensitivity:
Press
UP ARROW
it. When it's set at the desired level, press
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
S
ENSITIVITY
to select
ARROW
To adjust the sensitivity, follow the same steps used for
adjusting sensitivity in auto mode above.
®

GRAYLINE

Grayline
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
until the
MENU
to increase the sensitivity,
A /M
UTOMATIC ANUAL
, then press
M
ANUAL

lets you distinguish between strong and weak
S A
ENSITIVITY DJUSTMENT
MENU
menu appears. Press
to clear the menu.
PWR
until the
MENU
30
menu appears. Press
DOWN ARROW
to clear the
PWR
until the
DOWN
menu appears.
G
RAYLINE
to decrease