Very
small fish probably
will not arch at all. Medium sized fish will show a
partial arch, or a
shape
similarto 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
waterconditions, such as heavy
surface clutter,
thermoclines,
etc., the
sensitivity sometimes cannot be increased enough
to get fish
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 smallerthe
segment, the
better the screen resolution will be. The easiest
way to do this on the
UltraNav II is with the Zoom feature. This feature
expands the
echoes,
making it easier to see detail. For the best
results,
turn the sensitivity up
as high as possible without
getting too much noise on 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
sensitivity.
WATER TEMPERATURE AND
THERMOCLINES
Water
temperature has an important-if
not
controlling-influence upon the
activities of
all
fish. Fish are cold blooded and their bodies are
always
the
temperature of the
surrounding 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
watertemperature is within rather narrow
limits. A surface temperature meter helps identify
the desired surface
water
spawning temperatures for various
species. Trout can't
survive
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.
The
temperature of water in the lake is seldom constant from
top
to
bottom.
Layers of different
temperatures form,
and the
junction
of
a warm and cool
layer
of water is called a thermocline. The depth and thickness of the
thermocline can vary
with the
season or
time of day. In
deep lakes there
may
be two or more at
different depths. Thermoclines are important to
fishermen because
they
are areas where fish are active. Many
times bait
fish will be above the
thermocline while
larger game fish will
suspend in or
just below it.
ULTRANAV H
GPS OPERA11ON
WARNING!
USE THIS GPS RECEIVER ONLY AS AN AID TO NAVIGATION. A
CAREFUL NAVIGATOR NEVER RELIES ON ONLY ONE METHOD TO
OBTAIN POSITION INFORMATION.
CAUTION
This GPS receiver, (like all GPS navigation equipment) will show the
shortest, most direct path to a waypoint. It
provides navigation data to the
waypoint regardless of obstructions.
Therefore,
the prudent navigator will
not
only take
advantage of all available
navigation
tools when
travelling to
a
waypoint,
but
will,also
visually
check to make certain a
clear, safe
path to
the
waypoint is always available.
NOTICE!
As of this
writing, the Department
of Defense (DOD) has not declared the
GPS navigation system operational.
The
system is
still in a
testing phase.
Satellitescan beturned off
oraccuracycan be
degraded
atwill
bythe system
operators. Remember that the UltraNav
II, or
any
GPS
receiver is only
as
accurate as the
system it's
using.
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