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Navman Trackfish 6600 Manual

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TRACKFISH 6600 Installation and Operation Manual38
NAVMAN
8-4 Fish detection and display
Where to find fish
Underwater features like reefs, wrecks and rocky
outcrops attract fi sh. Use the 50 kHz or 50/200 kHz
frequency display to fi nd these features, then look
for fi sh by passing over the feature slowly several
times using the Zoom display (see section 9-2).
If there is a current, the fi sh will often be found
downstream of the feature.
When fi shing with the TRACKFISH with the Fish
symbols Off, a weak fuzzy band may appear
between the bottom trace and surface. This
might indicate a thermocline - a rapid change
in water temperature, such as the edge of
a warm or cold current. The temperature
difference can form a barrier which the fi sh
may not swim through. In fresh water, fi sh
often collect around a thermocline.
Fish symbols
The TRACKFISH uses Navman’s SBN
technology to analyse sonar echoes and
identify which are likely to be fish. The
TRACKFISH can be set up to display a fi sh
symbol and the depth over these echoes (see
section 15-3, Fish symbols). While SBN is very
sophisticated it is not foolproof - there will be
times when the TRACKFISH will not be able to
differentiate between fi sh and large air bubbles
or rubbish.
Depending on the strength of a fi sh signal, the
TRACKFISH can display a small, medium or
large symbol (see section 15-3, Fish fi lter).
To see the maximum amount of information
from the echoes, turn Fish symbols off. Fish
appear as arches on the display.
Fish arches
In good conditions, a fi sh passing through the
cone-shaped ultrasonic pulse is displayed as
a fi sh arch. The 50 kHz frequency uses a wider
cone than the 200 kHz frequency. This makes
the fi sh arches easier to see.
A fish arch starts when a fish enters the
weak edge of the sonar cone, generating a
weak echo that is displayed as the start of
the fi sh arch. As the fi sh moves closer to the
middle of the cone, the distance between the
transducer and the fi sh reduces and the echo
is displayed at progressively shallower depths,
producing a rising shape. When the fi sh passes
directly beneath the middle of the cone, the
echo becomes strongest and thickest. As the
fi sh passes out of the middle of the cone the
reverse happens with a progressively weaker
and deeper echo.
There are many reasons why fi sh arches may
not be seen. For example:
• Poor transducer installation (see Transom
Transducers Installation Guide).
• If the boat is anchored then fi sh will tend to
show on the display as horizontal lines as
they swim into and out of the transducer
sonar beam. Slow speeds in deeper water
give the best fi sh arch returns.
• Range is important. It will be much easier
to see fi sh arches when using zoom mode
to concentrate on a particular section of
water, rather than just displaying everything
from the surface to the bottom. Zooming
increases screen resolution and is
necessary for good fi sh arches.
• It is diffi cult to get fi sh arches in shallow
water as the transducer sonar beam is very
narrow near the surface and fi sh do not
stay within the beam long enough to display
an arch. Several fi sh in shallow water
tend to display as randomly stacked areas
of colour.
• Wave motion may result in distorted
fi sh arches.
Fun fi sh symbol Fish archFun symbol + depthNormal fi sh symbol
… 37 …


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