Eagle Magna - No Fish Arches When the Fish ID Feature Is off

Weak
bottom
echo,
digital readings erratic,
or no
fish
signals (cont.):
2.
Electrical noisefromthe boat's
motorcan interfere with the sonar. This causes
the sonarto
automatically
increase its Discrimination or noise
rejection
feature.
This can cause the
unit to eliminate
weakersignais
such as fish or even structure
from the
dispiay.
3.
The water
may
be
deeper
than the sonar's
ability
to find the bottom. if the
sonarcan't find the bottom
signal
while it's in the
automatic
mode,
the
digital
will
flash
continuously.
it
may change
the
range
to limits
fargreaterthan
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,
lithe
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 orderfor 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 fromthe boat's motorcan interfere with
the sonar. This causes
the
sonar to
automatically
increase its Discrimination
or noise
rejection
feature.
This can cause the unit to
eliminate
weakersignals
such as fish or even
structure
from the
display. Try using
resistorspark 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
orderforthe unit to
display
a fish
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 waterthan 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.
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