Furuno CH-250 Uživatelský manuál stáhnout pdf (Strana 41)

2-23

2.14 Interpreting the Horizontal Display

This section provides information necessary for interpreting the horizontal display.

2.14.1 How the horizontal mode picture is painted

The wide sounding beam is emitted from the soundome at a certain tilt angle (see hatched area

in the figure below). The information (target echoes) obtained by this beam is displayed in

sectors of increments of 12° of the screen. Thus, all directions around the boat are sounded in

30 times of transmissions.

Note: When the “FAST SCAN” is switched off, the equipment operates in a narrow sounding

beam. Then, the echoes appear on a 6° sector in each transmission, so 60

transmissions are required to complete the full 360° picture (6°x 60=360°). This means

that training speed is slower. However, since transmission power is concentrated into the

narrow sounding beam, a superior detection range is obtained. Furthermore, since the

bottom contour is painted distinctly, bottom fish may be more easily detected.

Sounding Beam Screen Display

Tilt: θ

Sounding

Beam

Tilt: θ

Train: 6˚*

When the narrow sounding beam (6˚)

is selected 60 transmissions are required

to complete the full circle.

*12˚ When high speed training is

selected.

Figure 2-20 How the horizontal mode picture is painted

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Furuno CH-250 Uživatelský manuál Strana 41