Bedienungsanleitung Navman FISH 4431 (Seite 10 von 30) (Englisch)

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Fish 4430/4431 Installation and Operation Manual

Fish detection and display

The fish symbol option can be customized, or

switched off altogether so that the echoes are not

converted to fish symbols on the screen. Section

4-4 explains how to do this. The differences

between Fish symbols on and off are:

Fish symbols ON

Using NAVMAN’s SBN sonar technology

the fishfinder analyses all return signals

and eliminates most false signals and

clutter so that remaining targets are

most likely fish. Depending on the

strength of the remaining signals, they

are displayed as either small, medium

or large fish symbols with or without

depth. Whilst the SBN processing is very

sophisticated it is not foolproof and

there will be times when the unit will

not be able to differentiate between

large air bubbles, rubbish containing

air, fishing floats etc and genuine fish

returns.

Fish symbols OFF

For experienced users this will always

provide the best information as

every sonar return signal is displayed,

whether it is surface clutter, a

thermocline or a fish.

Fish Arches

In ideal conditions and with Fish symbols turned

OFF, a fish passing through the cone-shaped

ultrasonic pulse is displayed on the screen as

a fish arch:

As the fish enters the weak edge of the sonar

cone it generates a weak return signal that

turns on the first pixel on the fishfinder

screen. As the boat moves closer to the fish

the distance between the transducer and the

fish reduces and the return signal is displayed

at progressively shallower depths, producing

the start of an arch. When the fish is directly

beneath the transducer and in the middle of

the beam then the returned signal is even

stronger so the arch becomes thicker. As the

fish passes out of the cone the reverse happens

with a progressively weaker and deeper return.

In reality there are many reasons why fish

arches can’t be seen. For example:

· Poor transducer installation - please refer to

the Transducer 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 best fish arch returns.

· Range is important. It will be much easier

to see fish arches when using NAVMAN’s

split screen 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.

· It is almost impossible to get fish arches

in shallow water as the transducer sonar

beam is very narrow near the surface and

fish do not stay within the beam long

enough to display an arch. Several fish in

shallow water tend to display as randomly

stacked blocks of pixels.

3-3 HISTORY screen interpretation

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Navman FISH 4431 Seite 10

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