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FISH 4350 / 4380 Installation and Operation Manual16

NAVMAN

Note: Times indicated are for illustration only.

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Stationary boat

When a boat is stationary, all bottom echoes will come from

the same small area of bottom. This will produce a ß at bottom

trace on the screen.

The appearance of the Sonar and Zoom screens can

be changed to suit individual preferences.

4-2 Fish detection and display

Where to Þ nd Þ sh

Underwater features like reefs, wrecks and

rocky outcrops attract Þ sh. Use the sonar to

Þ nd these features, then look for Þ sh 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 Þ sh will often

be found downstream of the feature.

When fishing with the FISH 4350 and FISH

4380 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 Þ sh may not swim through. In fresh water,

Þ sh often collect around a thermocline.

Fish symbols

The Þ sh symbol can be customized or

switched off altogether so that the echoes

are not converted to Þ sh 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 sonar technology the

Þ shÞ nder analyses all echoes and eliminates

most false signals and clutter so that remaining

targets are most likely Þ sh. Depending on the

strength of

the remain-

ing echoes,

they are

displayed as

either small,

medium or

large Þ sh

symbols

- with or

without

depth. While

the SBN

process-

ing is very

sophisticated

it is not foolproof - there will be times when

the Þ shÞ nder will not be able to differentiate

between large air bubbles, rubbish containing

air, Þ shing ß oats etc. and Þ sh.

The following picture shows the Sonar display with

the Fish symbol: On + depth:

Fish symbol Off

For experienced users this always provides the

best information as every echo is displayed,

whether it is surface clutter, a thermocline or

a Þ sh.

The picture in section 4-1 Interpreting the

display, shows the Sonar display with the Fish

symbols Off. The Þ sh appear as arches.

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