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select “Auto Sensitivity” and press the ENT key. To turn it off, repeat the
above steps. Press the EXIT key to erase the menu.
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. Since
GRAYLINE shows the difference
between strong and weak sig-
nals, adjusting the sensitivity may
require a different GRAYLINE level, also. The level chosen by the 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 adjust the GRAYLINE level, press the MENU key, then select “Grayline”.
The screen above appears. Use the up or down arrow keys to adjust the
gray level. You can see the change on the chart record as you press the
keys. After you’ve finished, press the EXIT key to erase the menu.
RANGE - Automatic
When turned on for the first time,
the bottom signal is automatically
placed in the lower half of the
screen. This is called Auto Rang-
ing and is part of the automatic
function. However, depending
upon the bottom depth and the
current range, you can change
the range to a different depth. To
do this, press the MENU key, then
select “Depth Range”. The screen
at right appears. Press the up or down arrow keys to select a different