Bedienungsanleitung Navman FISH 4200 (Seite 5 von 32) (Englisch)

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5FISH 4200 Installation and Operation Manual

NAVMAN

1 Introduction

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 4200.

The NAVMAN Fishfinder

The FISH 4200 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 4200 measures the water depth, water

temperature and boat speed.

It also measures the battery voltage, engine hours,

and fuel consumption (requires optional fuel kit), and

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

An installed FISH 4200 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 4200 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 new

proprietary SBN Technology for sonar processing to

improve signal enhancement, bottom recognition & 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 4200 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 4200 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 4200 is installed and used

correctly.

How to find fish

Underwater features like reefs, wrecks and rocky

outcrops attract fish. Use the FISH 4200 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.

For deep-sea fishing with the FISH 4200, a rapid

change in temperature may indicate the edge of a

warm or cold current. The temperature difference

can form a barrier, and the fish may not swim through

this. Search for fish on either side of the barrier.

Cleaning and maintenance

The FISH 4200 should be cleaned with a damp

cloth or mild detergent. Avoid abrasive cleaners and

petrol or other solvents. Always cover or remove a

transom-mounted transducer when repainting the

hull. If painting over a through hull transducer with

antifouling paint then use only one coat of paint.

When repainting the transducer, remove previous

coats of antifouling paint by sanding it lightly.

When not in use, the FISH 4200 can either be

removed from the installation bracket and stored

in a safe, dry, cool place such as the NAVMAN carry

bag, or left on the installation bracket and securely

covered with the sun cover supplied.

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