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FISH SIGNALS
For
example,
to set
the
range
from 0 to 31
feet,
press
3-1 -LOWER LIMIT.
The
signals displayed
on the X-3
by
fish can be identified
by
various
shaped markings
in certain
patterns,
as
opposed
to random marks
created
by noise,
or the
solid,
continuous
markings
made
by
the bottom.
Individual fish
can,
at
times,
be
distinguished by
a characteristic arch that
separates
them from their
stationary surroundings.
The reason
for this is
shown
below. The distance to a fish when it moves into a sonar's cone of
sound is shown as "A"
Figure
21.
When the fish has moved into the cen-
ter
of the
cone,
the distance to it will be
shorter,
"B" and as it moves out
of the
cone,
the distance will increase
again
as shown in "C".
If a
partial
arch occurs most of the time on
your
unit
(the
mark curves
up,
but not
back
down,
or
vice-versa)
it could be the transducer is
not
pointed straight
down. If the transducer is mounted on the
transom,
adjust
it until the fish show the distinctive arch. This
may
take some
trial
and error
until the correct
mounting angle
is achieved.
NOTE:
Although
the maximum
lower limit of the X-3 is
999
feet,
the
actual
depth
that the X-3 will reach
is
dependent
on
the water
conditions,
bottom
conditions,
and
the
quality
of the transducer installation.
I
UPPER
LIMIT
UPPER LIMIT
It is often desirable
to
expand
a section of the
display
to show more
detail. This is made
possible
on the X-3
by using
the UPPER LIMIT
key.
To
change
the
upper
limit of the
screen,
simply
press
the desired
depth
(any
number between 0 and
989
feet)
and then the
UPPER LIMIT
key.
The
only
restriction on
the
upper
limit is that it must not be closer
to the lower
limit than 10 feet.
In other
words,
if the lower limit is
set to 81
feet,
the
upper
limit cannot be set
any
closer than 71 feet A ten foot
segment
or
larger (20,
30, 120, etc.)
is
required.
Upper
and lower
limits
may
be set in various combinations
to show
seg-
ments from
the surface to the bottom and
nearly anywhere
in between to
expand
or "zoom"
a
portion
of the
display.
If a ten foot
segment
is
chosen,
then
the screen resolution is 1½". This means
that each dot is
equal
to 1½ inches
when a ten foot
segment
is chosen.
25
10
.p
I'll"
LOWER LIMIT
Figure
7
AP\c
Figure
21
—III 0
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