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,
0-100
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 orderforthe 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
rejection
feature. This can cause the unitto eliminate weaker
signals
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 orderfor the
unit to
display
afish
arch,
it has to be able to
receive the fish's echofromthe 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.
r
ULTRA II PLUS POWER CONNECTIONS
NOISE
Minimize electrical noise
by routing
the
power
cable
away
from other
possible
sources of electrical interference. One of the
largest
noise
generators
is the
engine's wiring
harness. For
the best
results, keep
the
power
and transducer cables
away
from the
engine
wiring.
Bilge pumps
and their
wiring
can
also radiate
noise,
so
keep
the cables
away
from
them,
if
possible.
VHF radio antennas and cables radiate RF
energy
at
high power
levels.
It is
important
to
keep
the
power
and transducer cables
away
from
them,
also. See the sonar
troubleshooting
section for
tips
on
preventing
noise
problems.
TRANSDUCER
CONNECTIONS
See the transducer owner's manual included with the unit for
complete
transducer installation instructions.
SIDE SCAN
Both the Ultra II and Ultra II Plus have
optional
side-scan
capability.
To use
this
feature, you
must
purchase
the ScanFac
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.
RED
TO
SPEED/
TEMP
SENSOR
3
amp
FUSE
34 3
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