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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