Manual Navman FISH 4432 (page 19 of 37) (English)

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4-3 Fish detection and display

Where to find fish

Underwater features like reefs, wrecks and

rocky outcrops attract fish. Use the 83/200

kHz frequency display to find these features,

then look for fish by passing over the feature

slowly several times using the Zoom display

(see section 5-2 Sonar Zoom display). If there

is a current, the fish will often be found

downstream of the feature.

When fishing with the FISH 4432/4433 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 fish may

not swim through. In fresh water, fish often

collect around a thermocline.

Fish symbols

The fish symbol can be customized or switched off

altogether so that the echoes are not converted to

fish symbols on the display. See section 3-2 Setup

> Sonar. The differences between Fish symbol On

and Off are:

Fish symbols On

Using Navman’s SBN-II sonar technology the

fishfinder analyses all echoes and eliminates most

false signals and clutter so that remaining targets

are most likely fish. Depending on the strength

of the remaining echoes, they are displayed as

either small, medium or large fish symbols - with

or without depth. While the SBN-II processing is

very sophisticated it is not foolproof - there will

be times when

the fishfinder

will not be able

to differentiate

between large air

bubbles, rubbish

containing air,

fishing floats etc.

and genuine fish.

The picture shows

the Sonar display

with the Fish

symbol: symbol

+ depth:

Fish symbols Off

For experienced users this always provides the

best information as every echo is displayed,

whether it is surface clutter, a thermocline or

a fish.

The picture in section 4-1 Interpreting the

display, shows the Sonar display with the Fish

symbols Off. The fish appear as arches.

Fish arches

In good conditions and with Fish symbols

Off, a fish passing through the cone-shaped

ultrasonic pulse is displayed as a fish arch. The

83 kHz frequency uses a wider cone than the

200 kHz frequency. This makes the fish arches

easier to see.

A fish arch occurs when a fish enters the weak

edge of the sonar cone, generating a weak

echo that is displayed as the first pixel of

the fish arch. As the fish moves closer to the

middle of the cone, the distance between the

transducer and the fish reduces and the echo

is displayed at progressively shallower depths,

producing the start of an arch. When the fish

passes directly beneath the middle of the cone,

the echo becomes strongest and thickest. As

the fish passes out of the middle of the cone

the reverse happens with a progressively

weaker and deeper echo.

There are many reasons why fish arches may

not be seen. For example:

• Poor transducer installation (see Transom

Transducers Installation Guide).

• If the boat is anchored then fish 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 fish arch returns.

• Range is important. It will be much easier

to see fish 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 fish arches.

FISH 4432/4433 Installation and Operation Manual21

NAVMAN

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Navman FISH 4432 Manual

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