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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.
.—
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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