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Lowrance X-25B Manual

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CLEAR key to clear the display. If you wait a few seconds, it will
automatically clear.
GRAYLINE
®
Grayline lets you distinguish between strong and weak echoes. It “paints”
gray on targets that are stronger than a preset level. This shows the
difference between a hard or soft bottom, large fish versus smaller ones,
or rocks and brush on the bottom. For example, a soft, muddy, or weedy
bottom returns a weaker signal which shows a narrow or no gray line. A
hard bottom returns a strong signal that causes a wide gray line.
If you have two targets of equal size, one with gray and the other without,
the target with gray is the stronger echo. This helps distinguish fish from
structure, or the larger fish from a smaller one.
Grayline
®
is adjustable. Since it shows the
difference between strong and weak echoes,
changing the level may require a different
sensitivity setting.
To change the Grayline level, first press the
MENU key until the Grayline menu appears.
Now press the up arrow key to increase the
level, the down arrow to decrease it. The bar
graph in the Grayline menu box shows the
level of Grayline now in use. Echoes scrolling
onto the screen will also show the effects of
the Grayline change. If you reach the maxi-
mum or minimum level, a tone sounds alert-
ing you to the limits.
The level chosen by the X-25B when it’s first turned on is usually adequate
for most conditions. Experiment with your unit to find the Grayline setting
that’s best.
FISH ID FEATURE
The Fish ID feature identifies targets that meet certain conditions as fish.
The microcomputer analyses all echoes and eliminates surface clutter,
thermoclines, and other undesirable signals. In most instances, remaining
targets are fish. The Fish ID feature displays symbols on the screen in
place of the actual fish echoes. There are four symbol sizes: tiny, small,
medium, and large. These show the relative size between targets. In other
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