Manual Navman FISH 4200 (page 12 of 32) (English)

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NAVMAN

FISH 4200 Installation and Operation Manual

Select MAIN MENU - ZOOM to display the ZOOM

screen.

The ZOOM screen is split into two parts. On the right

is the full range section (just like the HISTORY

screen) and on the left is the zoom section.

Full range section

Zoom section

Zoom bar

The full range section illustrated is 150 feet and the

zoom bar, located on the right edge of the screen,

shows the area that is enlarged in the zoom section,

in this case the section between 50ft and 100ft.

The zoom section shows the area of interest (such

as fish or features close to the bottom) in greater

detail than the HISTORY screen.

Bottom Lock

The zoom bar is normally locked to the bottom

(Bottom Lock) so that the bottom is always

displayed in the zoom section, regardless of

changes in depth.

To turn Bottom Lock off, press

then move the

zoom bar to the desired position with

To turn Bottom Lock on, move the zoom bar down

until it touches the bottom and the message

“BOTTOM LOCK ON” briefly appears.

If Bottom Lock is off and the bottom rises to meet

the zoom bar, the zoom bar will temporarily track

the bottom. This condition will cease when the

depth exceeds the original depth of the zoom bar.

Changing the Zoom

To increase magnification (make the zoom bar

smaller), press . To decrease magnification (make

the zoom bar bigger), press .

Alternatively, the zoom bar can be adjusted in the

HISTORY screen before switching to ZOOM.

3-4 ZOOM screen

Select MAIN MENU - SONAR to display the SONAR

screen.

This is a powerful feature and with some experience,

this screen can be used to identify both the type of

bottom and the fish species.

On the Sonar Echo section on the right side, the

strength of an echo at a particular depth is shown by

a horizontal line at that depth. A strong echo produces

a long line, whereas a weak echo produces a short

line. Below the echoes the screen shows the Shading

Bar. This disappears from view after a few seconds,

but just press

to re-display it.

The left side of the screen is the Fish History section.

Using the Shading Bar as a control, the fishfinder

interprets the echoes shown on the Sonar Echo

section and uses this information to draw the Fish

History section.

Recognising the Type of Bottom

The bottom trace is the strongest echo shown in the

lower part of the left side of the screen.

A bottom trace with a wide black layer is indicative

of a hard bottom, because a hard bottom returns

strong echoes. Conversely, a soft bottom produces

medium or weak echoes, which are shown by a

narrower trace.

Small strong echo

(e.g. fish). This

usually flashes on

and off as the

ultrasonic pulse

strikes the fish.

Large strong signal

(e.g. bottom)

Shading Bar

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

sonar display on the FISH 4200 is 70 pixels wide,

so it can show 70 levels of return echo strength,

which is a powerful feature.

When fishing among a school of fish and catching

them, note the fish species and the strength of the

echo that it returns on the fishfinder on the Sonar

Echo screen. Then, the next time that particular

3-5 SONAR screen

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Navman FISH 4200 Manual

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