Bedienungsanleitung Navman FISH 4431 (Seite 5 von 30) (Englisch)

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Fish 4430/4431 Installation and Operation Manual

Congratulations on choosing a NAVMAN

fishfinder. For maximum benefit, please read

this manual carefully before installation and

use.

This manual describes the installation and

operation procedures for the FISH 4430/4431.

The NAVMAN Fishfinder

The FISH 4430/4431 is an ultrasonic fishfinder

with four levels of greyscale. It provides

powerful software and a large, high-resolution

screen with a zoom facility and a choice of fish

symbols. As well as detecting fish, the FISH

4430/4431 measures the water depth, battery

voltage, engine hours and water temperature.

The Fish 4431 also measures boat speed and

has two distance logs (Trip Log and Total Log).

An installed FISH 4430/4431 has two parts:

- The transducer attached to the hull.

- The display unit.

The transducer generates an ultrasonic pulse

(sound that is above the hearing range of the

human ear), which travels down towards the

bottom, spreading out into a cone shape.

When the pulse meets an object, such as a fish

or the bottom, some of the pulse is reflected

back up towards the boat and is received by

the transducer. The depth of an object can be

calculated by measuring the time between

sending the pulse and receiving its echo.

The NAVMAN FISH 4430/4431 will detect

the bottom down to 600 feet (180 metres),

depending on the clarity of the water and the

type of transducer used.

The strength of an echo can vary for a number

of reasons. Larger fish usually return stronger

echoes, and so do fish in the middle of the

cone, where the pulse is strongest. Reasons

for weak echoes include the fish or object

being in deep water, turbid water or in the

edge of the cone where the pulse is weakest.

Turbid water scatters the ultrasonic pulse and

is difficult to ‘see’ through. Turbidity can be

caused by air in the water (e.g. from another

boat’s wake) or by mud in the water.

Important

It is vital to the performance of the fishfinder

that the transducer is installed in the best

location. Please follow the instructions in the

Transducer Installation manual very carefully.

All of the NAVMAN 4000 Series fishfinders use

proprietary SBN Technology for sonar processing to

improve signal enhancement, bottom recognition

and noise rejection. SBN Technology uses

the latest in digital adaptive filter algorithms

to enhance all returned signals. At the same

time, SBN Technology uses active noise control

to reject interference, which can often be

mistaken by fishfinders for true returns. Using

SBN Technology, the FISH 4430/4431 analyses

the reflections from each pulse, filters false

returns, and displays what is in the water under

the boat.

The distinctions between the four levels of

shading help the user to better interpret what

is in the water and what type of bottom is

under the boat.

Assisting with navigation

The FISH 4430/4431 can be used to find fish,

to locate features on the bottom such as reefs

or wrecks, and to help recognise favourite

fishing spots from the profile of the bottom.

Use the NAVMAN fishfinder to assist navigation

by following the depth contours marked on

charts.

IMPORTANT NOTE ON USE. While any fishfinder

can be used as an aid to navigation, accuracy

can be influenced by many factors including

the location of the transducer. It is the

user’s responsibility to ensure that the FISH

4430/4431 is installed and used correctly.

How to find fish

Underwater features like reefs, wrecks and rocky

outcrops attract fish. Use the FISH 4430/4431

to find these features, then look for fish by

passing over the feature slowly several times

using the ZOOM screen (see section 3-4).

Where there is a current, the fish will often be

found downstream of the feature.

1 Introduction

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Navman FISH 4431 Seite 5

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