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SURFACECLUTTER
The
markings
at the
top
of the screen
represent
the surface of the water
which can extend
many
feet below the surface. This can interfere with
fish
signals
or other
targets.
It's called Surface Clutter and is caused
by
algae, plankton,
air bubbles caused
by
wave action or boat
wakes,
bait
fish,
or
temperature
inversions.
These marks are normal and can be seen at
any
time
during
the
year.
It's
usually
the worst in the
spring
and
summer,
slacking
off in the fall and
winter.
Figure
23
WATER TEMPERATURE
AND
THERMOCLINES
Water
temperature
has an
important—if
not
controlling—influence upon
the activities of
all fish.
Fish
are
cold
blooded and their bodies are near
the
temperature
of the
surrounding
water.
During
the
winter,
this slows
down their metabolism so that
they
can
only
utilize about a fourth as
much food as
they
consume in the summer.
Most fish don't
spawn
unless the water
temperature
is within rather nar-
row limits. Trout can't survive in streams that
get
too
warm;
bass and
other fish
eventually
die out when stocked in lakes that remain too cold
during
the summer. So fish will do without food rather than venture into
water that is too hot or too
cold;
others will shift
position
for a
tempera-
ture
change
as
slight
as one-half of one
degree.
While some fish have a
wider
temperature
tolerance than
others,
each of them has a certain
range
within which it tries to
stay. Schooling
fish
suspended
over
deep
water lie at the level that
provides
this
temperature
in
which,
we
assume,
they
are the most comfortable.
101
CLEAR
I CLEJ
If
you press
a
key
that is not what
you
wanted,
you
can wait six seconds
before
pressing
another
key
and the X-3 will
automatically
clear or
"forget"
the last
key
entered.
For
example,
if.
you
wish to turn on the
lights,
the
proper keys
to
press
are 2nd
-9.
However,
if
you accidentally pressed
the 0
key
instead
of the
2nd
key by
accident, you
could wait six seconds until the
0
disappears
from the
screen,
then
press
2nd-9. Another
quick way
to clear an incor-
rect
entry
is to
press
2nd-O and the last
key
entered will
be
erased.
The entire
display may
be erased
by pressing
2nd-0-O.
Everything
except
the
digital
numbers
(if
turned
on)
will be cleared
from the
display.
RANGE
Although
the X-3 will
automatically
change
the
range
whenever the bot-
tom
gets
shallower or
goes
deeper,
there
are times when it is desirable
to
expand
the
range,
or look at a different
segment
of the water below.
The
range
can be set
anywhere
from 0 to 989 feet
on the
upper
limit and
10 to 999 feet on the lower
limit,
provided
the lower limit is no closer to
the
upper
limit than 10 feet.
18
tAUTO
RNG
AUTO RANGE
When the X-3 is first
turned
on,
the AUTO RANGE function is enabled. It
may
be turned off
anytime by pressing
the 2nd
key,
then the 8
key. (In
this
manual, pressing keys
in
sequence
as
just
described will be shown like
this:
2nd-B.)
The AUTO RANGING annunciator in the bottom
right
hand
corner of the
display
will
disappear, signifying
the automatic
ranging cap-
ability
has been
tumed off. To return to the AUTO RANGE
mode,
simply
press
the 2nd-8
keys again
and the unit will
automatically
track the bot-
tom and
place
it in the lower
4/5
of the screen.
27
8
SURFACE
cLurrER
F
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