Specifications

Very
small fish
probably
will
not arch at all. Medium sized fish will
show
a
partial arch,
or
a
shape
similar to an arch if
they're
in
deep
water.
Large
fish
will
arch,
but turn the
sensitivity up
in
deeper
water to see the
arch.
Because of water
conditions,
such as
heavy
surface
clutter,
thermoclines, etc.,
the
sensitivity
sometimes cannot be increased
enough
to
get
fish arches.
One of the best
ways
to
get
fish
arches is to
expand
or "zoom" a
segment
of the water. For
example,
from 45 to 60 feet. The
smaller the
segment,
the better the screen
resolution will be. The easiest
way
to do
this on the UltraNav is
with the Bottom Track feature. Use the 2x or 4x
Bottom Track mode to
expand
the
echoes,
making
it easier to see
detail. For the best
results,
turn
the
sensitivity up
as
high
as
possible
without
getting
too much
noisepn
the
screen. In medium to
deep water,
this method should work to
display
fish
arches.
If
you
see fish
signals
when the unit is in
the manual
mode,
but don't
get
fish
symbols
when the Fish I.D.
feature is
on,
try increasing
the sensitiv-
WATER
TEMPERATURE AND THERMOCLINES
Water
temperature
has
an.
important-if
not
cdntrolling-influerice upon
the activities of all fish. Fish are
cold blooded and their bodies are
always
the
temperature
of
the
suritunding
water.
During
the
winter,
colder water slows
down their metabolism. At this
time, they
need
about a fourth as much
food as
they
consume in the
summer.
Most fish don't
spawn
unless the water
temperature
is within rather
narrow limits.
The surface
temperature
meter built into the
Ultra Plus
helps
identify
the desired surface water
spawning temperatures
for
various
species.
Trout can't
$urvive
in
streams that
get
too warm.
Bass and other
fish
eventually
die out when stocked in lakes
that remain
too
cold
during
the summer. While some fish have a wider
temperature
tolerance than
others,
each has a certain
range
within
which it tries to
stay. Schooling
fish
suspended
over
deep
water lie at the level
that
provides
this
temperature.
We assume
they
are the
most comfortable
here.
32
3. If
you're using
the loran on
land, keep
away
from
trees, buildings,
and
(most
important) power
lines. The
loran will not work inside a
building,
or
under a metal
carport, shed,
etc.
(NOTE:
The
purposes
se units are
designed
for
marine
(boating)
and
generally
work best on the
water.)
4.
If
you're having
trouble with the
unit
locking
on to the
stations, you
may
have a
piece
of
gear
such as a
radio,
bilge pump,
or
engine
that is
causing
interference. First turn
everything
in the boat
off,
then
try
initializing
the unit. Enter the
initial
position
first. If
that
doesn't
work,
then
try
the GRI. If the unit
still doesn't lock
on,
then
look for other
sources of interference.
(see
below)
INTERFERENCE SOURCES or BAD
RECEPTION
Land Sources:
1.
Military
installations.
(High power
transmitters in the loran
band.)
2.
Hydro-electric plants.
(Dams)
3.
High voltage power
lines. These radiate
noise at
high
levels.
4.
Storms. A storm
between
you
and the
loran station can
interfere
with the
signals,
even if
it's
many
miles
away.
5.
Mountains, trees,
buildings.
These reflect the
signals.
Try
to
stay
in an
open
area.
Boat
Sources:
1. Boat
engine.
Resistor
spark
plugs help,
alternator
noise filter
may
also be
required.
2. Power cable
routed to fuse
panel
instead of
directly
to
battery.
Route
!
power
cable
directly
to the
battery.
3. Bad
antenna
placement.
The antenna should
be
placed
in an
open
area
on
the
boat,
away
from other
antennas or structure.
4.
Fluorescent
lights.
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