Example: Set range
to 16 to 31 feet Press: 1-6-UPPER LIMIT then 3-1
-
LOWER LIMIt
Figure 8
UPPER
LIMIT
NOTE: When the X-3
is in the AUTO RANGE mode, the
upper limit may
be changed at
anytime. If the
upper limit is
changed while
the unit is in
the AUTO RANGE mode,
the X-3 will continue to select a lower
limit that
will keep the bottom
displayed
in the lower ¾ portion of the screen.
15
DIGITAL (PtGrTAL
A
complete digital sonar is
incorporated
into the X-3. It
automatically
dis-
criminates between the valid bottom echoes and false echoes from
fish,
thermocline,
or surface clutter The
digital display
will show
only the bot-
tom depth. It
may be used at
anytime, in conjunction with
any
other
mode the X-3
may be in (with
the
exception of FASTRACK or High Speed
Scroll modes described in the
Advanced
Operation section of this
manual).
When the X-3 is
turned on, the bottom depth
will be
displayed on the
screen.
The
20
degree transducer is
almost
always
the
best to use in fresh water,
while the 8 degree
is used mostly in salt water In a
deep water environ-
ment, (300
feet—fresh
water, 100 feet—salt
water) the narrow cone
angle
is
more desirable because it
can penetrate
to much deeper depths since
the sound energy
is concentrated in a smaller area.
Both the 8 degree
and the 20 degree
transducers
give
accurate bottom
readings,
even
though the bottom
signal
is
much wider on the 20 degree
model because you
are
seeing more of
the bottom.
Remember, the shal-
low edge of
the
signal shows you the true
depth.
The rest of the
signal
tells you
whether
you are over rocks, mud, dropoffs, etc.
Salt water boats need
to have the transducer
painted
with a thin coat
of
anti-foulant
paint to
prevent
organisms
from growing.
If unchecked,
bar-
nacles and other
marine
growth will cause a
decrease in the transduc-
er's sensitivity. Do not use a metal based
anti-foulant
paint as it will
decrease the
transducer's
sensitivity
also. There
are special anti-foulant
paints
carried
by most marine dealers specifically designed
for
transducers.
SIGNAL INTERPRETATION
Because
your X-3 is both extremely
sensitive and powerful,
it
can
give
you
an accurate picture
of the kind of bottom over
which
your boat is
passing. A bottom of firm
sand, gravel, shell,
or hard clay returns
a
fairly
wide
signal. If the automatic
sensitMty
is turned
off, and the signal
nar-
rows down, then it means that
you have moved over a mud bottom. Mud
absorbs the sound waves and returns a weak signal. Turn up the sen-
sitivity. If
you have the
automatic
sensitivity
turned on, watch the
sensitiv-
ity
bar. As the boat passes over the mud
bottom,
the X-3 will automati-
cally
increase the
sensitivity
to maintain a
good bottom signal. The
sensitivity
bar will help you in determining
if the bottom is soft or hard. If it
increases while in the same
depth of
water,
then the boat has moved
over a soft bottom. If it
decreases,
then it
is over a hard bottom. Of
course,
as the water depth increases or decreases,
the
sensitivity
will
change,
also.
Big rocks or stumps
on a smooth bottom send back
signals
above the
bottom, the
distance
depending upon
their height
If
you watch as
you
approach
a post or a
tree
stump, it will be
clealry visable
as a short line
extending
above the
bottom signal.
11 24
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