Bedienungsanleitung Navman FISH 4500 (Seite 24 von 36) (Englisch)

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5-4 Sonar 50/200 display

To show the Sonar 50/200 display, press DISP

and select Sonar Tab, select Sonar 50/200

and press ENT.

This shows a split display, with the 50 kHz sonar

history on the left side and the 200 kHz sonar

history on the right side. Gain settings can be

set independently for each frequency. Range

settings apply to both sections of the display.

To change items, press MENU until the Op-

tions menu is shown. Gain is explained in

section 4-4 Gain.

Range is explained in section 4-5 Range.

A-scope is explained in section 5-5 Sonar A-

Scope display.

Data header is explained in section 5-1 Sonar

display.

Split ratio is explained in section 5-2 Sonar

Zoom display.

5-3 Sonar Bottom display

To show the Sonar Bottom display, press DISP

and select Sonar Tab, select Sonar Bottom

and press ENT.

This shows a split display, with the sonar history

on the right side and the zoom section on the

left. The bottom signal is shown as a flat trace

in the centre of the zoom section.

Showing the bottom as a flat trace can make it

easy to compare the echo strengths shown in the

bottom signals. This can help to identify the type

of bottom and objects close to the bottom.

The zoom bar can only indicate the zoom range.

It cannot indicate the zoom offset as this changes

for each sounding displayed on the display.

The zoom bar is fixed in the middle of the

display.

See section 4-5 Range, for information about

adjusting the Zoom Range and Zoom Offset.

To change items, press MENU until the Options

menu is shown.

Gain is explained in section 4-4 Gain.

Range is explained in section 4-5 Range.

A-scope is explained in section 5-5 Sonar

A-Scope display.

Data header is explained in section 5-1

Sonar display.

Bottom lock and Split ratio are explained

in section 5-2 Sonar Zoom display.

5-5 Sonar A-Scope display

See section 4-4 Gain, for more information.

The strength of an echo at a particular depth

is shown by the length of the horizontal line at

that depth. A strong echo produces a long line

whereas a weak echo produces a short line.

To change items, press MENU until the Options

menu is shown.

Gain is explained in section 4-4 Gain.

Range is explained in section 4-5 Range.

Data header is explained in section 5-1

Sonar display.

Split ratio is explained in section 5-2 Sonar

Zoom display.

Fish recognition

The echo strengths shown on the A-scope can

be useful in recognising the type of fish. Different

species of fish have different sizes and shapes

of swim bladders. The air in the swim bladder

reflects the ultrasonic pulse, so the strength of

the echo varies between fish species according

to the size and shape of the swim bladder.

The user can define the level of the weakest and

strongest echoes to be shown on the sonar dis-

plays, by using the Gain and Threshold settings.

Divider line

between sonar

history and

A-scope

Gain setting

(strongest echo

for display)

Gain threshold

(weakest echo

for display)

To show the Sonar A-Scope display, press DISP

and select Sonar Tab, select Sonar A-Scope

and press ENT.

Use this to analyse the sonar data in detail and

optimize the Gain settings.

FISH 4500/4600 Installation and Operation Manual24

NAVMAN

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