Handleiding Navman FISH 4100 (pagina 8 van 25) (Engels)

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NAVMAN FISH 4100 Installation and Operation Manual

Changing the Gain Mode

Gain (sensitivity) controls the amount of detail

displayed on the screen. The NAVMAN fishfinder has

two gain modes, Auto Gain and Manual Gain:

· In Auto Gain, the gain is automatically adjusted

to compensate for water depth and clarity. The

use of Auto Gain is strongly recommended

when learning to use a fishfinder, or when

travelling at speed.

· In Manual Gain, the user can adjust the gain to

compensate for water depth and clarity. Manual

settings range from 1 to 9. High settings may

amplify normal background noise until it

appears as random pixels on the screen. The

ideal setting produces only a small number of

random pixels. Normally the best results with a

fishfinder are obtained in Manual Gain but

practice and experience are required to

understand how to adjust the gain correctly.

To change between Auto Gain and Manual Gain, hold

. The Gain mode will be displayed briefly at

the bottom of the screen.

When in Manual Gain the gain symbol

is shown

at the top of the display, followed by the gain level.

Press

to increase the gain level or press

decrease the gain level.

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

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 symbol on

and off are:

Fish Symbol 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 Symbol 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.

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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