Bedienungsanleitung Navman FISH 4100 (Seite 4 von 25) (Englisch)

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NAVMAN FISH 4100 Installation and Operation Manual

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 4100 and FISH 4150. The

manual generally refers to both products as the NAVMAN

fishfinder. The product name is used only when

describing features specific to that particular fishfinder.

The NAVMAN Fishfinder

The FISH 4100 is an ultrasonic fishfinder. 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 4100 measures the

water depth, battery voltage and engine hours.

The FISH 4150 also measures the water temperature,

the boat speed and has two distance logs (Trip Log

and Total Log).

An installed NAVMAN fishfinder 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 fishfinder 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,

as 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 or 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 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 NAVMAN fishfinder 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 NAVMAN fishfinder can be used to find fish, to

locate features on the bottom such as reefs or wrecks

and to help recognize 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 the NAVMAN

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 NAVMAN fishfinder

is installed and used correctly.

How to find fish

Underwater features like reefs, wrecks and rocky

outcrops attract fish. Use the NAVMAN fishfinder 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 4150, a rapid

change in temperature may indicate the edge of a

warm or cold current. The temperature difference can

form a barrier which the fish may not swim through.

Search for fish on either side of the barrier.

Cleaning and maintenance

The NAVMAN fishfinder 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 NAVMAN fishfinder 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. An optional sun cover, that also prevents

key depressions when in place, is available from

NAVMAN dealers.

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