Interpreting The Display - Furuno CH-37 Operator's Manual

Furuno color sector scanning sonar operator's manual model ch-37

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2.18 Interpreting the Display

When the narrow sounding beam (6-degree step operation) is selected, 60 transmissions

are required to complete the full circle detection.

2-18

This section provides the information necessary for interpret-

ing the display.

How the 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 45 sector of the screen. Thus, all directions around the boat

are s ounded in 8 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 times

of transmissions are required to complete full 360 pic-

ture (6 x 60 = 360 ). This means that sounding speed

reduces. However, since transmission power is concen-

trated into the narrow sounding beam, a superior detec-

tion range is obtained. Furthermore, since the bottom

contour is painted distinctly, bottom fish detection may

become easier.

Sounding Beam

60 /16

Tilt

Sounding

Beam

Figure 2-16 How the picture is painted

Freq: 60 kHz

Screen Display

45 *

Tilt:

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