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3. The water
may
be
deeper
than the sonar's
ability
to find the bottom. If
the sonar
can't find the bottom
signal
while it's in the
automatic
mode,
the
digital
will flash
continuously.
It
may change
the
range
to limits
far
greater
than the
water
you
are in. If this
happens, place
the unit in the manual
mode,
then
change
the
range
to a realistic
one,
(for
example,
0-1 00
feet)
and increase the
sensitivity.
As
you
move into shallower
water,
a bottom
signal
should
appear.
4. Check the
battery voltage.
If the
voltage drops,
the unit's
transmitter
power
also
drops, reducing
its
ability
to find the bottom or
targets.
Bottom
echo
disappears
at
high
speeds
or erratic
digital reading
or
weak bottom echo while boat is
moving
1. The transducer
may
be in turbulent water.
It must be mounted in a
smooth
flow of water in order for the
sonar to work at all boat
speeds.
Air
bubbles in the water
disrupt
the sonar
signals,
interfering
with its
ability
to
find the
bottom or other
targets.
The technical term
for this is Cavitation.
2. Electrical
noise from the boat's motor can interfere
with the sonar. This
causes the sonar
to
automatically
increase its Discrimination
or noise
rejectionfeature.
Thiscan causethe unitto
eliminateweakersignals
such
as fish or even
structure from the
display. Try using
resistor
spark plugs
or
routing
the sonar unit's
power
and transducer cables
away
from other
electrical
wiring
on the
boat.
No fish arches when the Fish ID feature
is off:
1. Make certain transducer is
pointing
straight
down. This is the most
common
problem
if a
partial
arch is
displayed.
See the Fish Arch section
in
your
owner's manual for more
information.
2. The
sensitivity may
not be
high enough.
In order
for the unit to
display
afish
arch,
it has to
be able to receive the fish's
echo from the time it enters
the cone
until it leaves. If the
sensitivity
is not
high enough,
the unit
displays
the
fish
only
when it is in the center of the cone.
3. Use the
Zoom feature. It is much easier to
display
fish arches when
zoomed in on a small
range
of water than a
large
one. For
example, you
will have much
better luck
seeing
fish arches with a
30 to 60 foot
range
than a 0 to 60
foot
range.
This
enlarges
the
targets,
allowing
the
display
to show much more detail.
4. The boat must be
moving
at a slow
trolling speed
to
see fish
arches. If the boat is
motionless,
fish
stay
in the
cone, showing
on the
display
as
straight
horizontal lines.
TRANSDUCER CONNECTIONS
See
the transducer owner's manual included
with the unit for
complete
transducer installation instructions.
SIDE
SCAN
The
X-55 has
optional
side-scan
capability.
To use this
feature,
you
must
purchase
the ScanPac
accessory.
To install
it,
follow the instructions
enclosed with
the ScanPac.
See the "Side Scan
Operation"
section in this manual
for information on
using
the side-scan
feature.
SPEED/TEMPERATURE/DISTANCE
LOG
To use the
speed,
temperature,
and distance
log
features,
you
must install
an
optional speed/temperature
sensor. Lowrance manufactures
a thru-
hull sensor/transducer combination
unit and a transom mount
speed/
temp only
sensor.
KEYBOARD
The
keyboard
has
keys arranged
in two vertical
columns
plus
a horizontal
row at the bottom.
The
keys
in the left column
are used to enter numbers
and menu
selections. The
keys
in the
right
column
activate the windows
feature and the
basic sonar functions. The menu
key
in the bottom
right
corner of
the
keyboard
activates the first menu
page.
The
keys along
the
bottom of the
screen are used to activate the alarm
menu, stop
the
chart,
and make menu selections
with the arrow
keys.
WINDOWS
-
This
key gives you
access to the windows
mode,
which lets
you
customize
displays.
SENS
-
Press this
key
to
adjust
the unit's
sensitivity.
RANGE
-
This
key
lets
you adjust
the
range
when the unit is
in the manual
mode.
ZOOM
-
The X-55
gives
you
2X and 4X zoom
capability
with this
key.
AUTO
-
This turns the automatic
feature off and on.
MENU
-
Press this
key
to show the
menus and
gain
access to
most
functions.
CLEAR
-
This
key
clears menus
and erases entries from the screen.
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