With
high sensitivity settings,
a second bottom echo
(second echo) may
appear. This is normal. It's caused
by the
returning signal reflecting off
the surface of the water. Then it makes a second trip
to the bottom and
back
again.
Remember, when the unit's automatic feature is on, the receiver's sen-
sitivity automatically adjusts
to the
surrounding conditions. The micro-
computer places
it at a level
slightly
above the minimum required to
pick
up the bottom signal. However, it's possible to change
the sensitivity
level while the unit is in automatic. This
may
be desirable if
the sensitiv-
ity
level is not
high enough
to show
fish or other small detail. The unit
will increase the sensitivity to pick up
the bottom
signal, then add in
the
level
you programmed.
To adjust
the
sensitivity
while the unit is in automatic, simply press
the
SENS. key. Then press either the up arrow key
to increase
it, or the
down arrow key to decrease it. As you press the arrow key, the
sensitivity bar moVes up or down, according to the sensitivity level
chosen.
You can adjust
the
sensitivity
in the
same manner when the unit is in
the
manual mode.
Very small fish probably
will not arch at all. Medium sized fish will
show
a partial arch, or a shape similar to an arch if they're in deep water.
Large
fish will
arch, but turn the
sensitivity up
in deeper water to see the
arch. Because of water conditions, such as heavy surface clutter,
thermoclines, etc., the sensitivity sometimes cannot be increased
enough to get fish arches.
One of the best ways to get fish arches is to expand or "zoom" a
segment of the water. For
example, from 45 to 60
feet. The smaller the
segment, the better the screen resolution will be. For the best
results,
turn
the
sensitivity up
as high as possible without
getting too much noise
on the screen. In medium to deep water, this method should work to
display fish arches.
.— BOAT'S DIRECTION OF TRAVEL
U
AUTO
SENS
RANGE
20
SENSrnVITY
BAR
N I-
14.: FISH ID
4L EU .
. U
•: .
A B
.
C
6 19
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