Bedienungsanleitung Navman FISH 4200 (Seite 9 von 32) (Englisch)

470014

Zoom out

Zoom in

Vorherige Seite

1/32

Nächste Seite

9FISH 4200 Installation and Operation Manual

NAVMAN

Changing the Gain Mode

Gain (sensitivity) controls the amount of detail

displayed on the screen. The FISH 4200 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 returned signal is

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.

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

Missbrauch melden von Frage und/oder Antwort

Libble nimmt den Missbrauch seiner Dienste sehr ernst. Wir setzen uns dafür ein, derartige Missbrauchsfälle gemäß den Gesetzen Ihres Heimatlandes zu behandeln. Wenn Sie eine Meldung übermitteln, überprüfen wir Ihre Informationen und ergreifen entsprechende Maßnahmen. Wir melden uns nur dann wieder bei Ihnen, wenn wir weitere Einzelheiten wissen müssen oder weitere Informationen für Sie haben.

Navman FISH 4200 Seite 9

Brauchen Sie Hilfe? Stellen Sie Ihre Frage.

Missbrauch melden von Frage und/oder Antwort

Art des Missbrauchs:

Forenregeln

Neu registrieren

Das Handbuch wird per E-Mail gesendet. Überprüfen Sie ihre E-Mail.

Ihre Frage wurde zu diesem Forum hinzugefügt

Info