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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.
8
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