Bedienungsanleitung Navman FISH 4431 (Seite 9 von 30) (Englisch)

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Fish 4430/4431 Installation and Operation Manual

Select MAIN MENU - HISTORY to display the

HISTORY screen.

The HISTORY screen displays the most recent

echoes on the right of the screen and the

oldest echoes on the left. These eventually

disappear off the screen.

The vertical bar on the right edge of the screen

is the zoom bar. This shows the zoom range. To

adjust the zoom range (see section 3-4).

3-2 HISTORY screen operation

Range

Range is the depth of water displayed vertically.

The NAVMAN fishfinder has two range modes,

Auto Range and Manual Range:

· In Auto Range, the fishfinder adjusts the

depth range automatically so that the

bottom is always shown in the lower part

of the screen. The use of Auto Range is

recommended.

· In Manual Range, the fishfinder shows only

a selected depth range. In areas of rapidly

changing bottom depth, such as the sea

floor around pinnacles, it can be useful to

prevent the screen from rescaling to always

show the bottom. If the bottom is deeper

than the specified depth range, it will not

be shown on the display screen.

To change the range mode, (see section 3-8).

Changing the Gain Mode

Gain (sensitivity) controls the amount of detail

displayed on the screen. The 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

+ or -. The Gain mode will be

displayed briefly at the bottom of the screen.

When in Manual Gain the gain symbol

shown at the top of the display, followed by the

gain level. Press + to increase the gain level or

press - to decrease the gain level.

The HISTORY screen does not show a fixed

distance travelled by the boat; rather, it

displays what has passed below the boat

during a certain period of time. The actual

display depends upon the boat speed and the

depth of the water.

As the boat travels through shallow water, the

echoes have less distance to travel between

the objects and the boat. This means that

the HISTORY screen display moves across the

screen more quickly than when the boat is

travelling in deep water. In deep water, the

echoes take longer to travel between the

objects and the boat, producing a display that

moves across the screen more slowly.

Note 1: Different fish symbols can be selected (see

section 4-3).

Note 2: The depth of bottom can be adjusted for keel

offset (see section 4-7).

Fish symbol

with depth

Selected depth range (0 to 150’)

Alarms

Bottom

Zoom bar

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