Bedienungsanleitung Navman Trackfish 6600 (Seite 37 von 83) (Englisch)

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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

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