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Adjusting the Gain
The GAIN control adjusts receiver sensitivity (gain). Adjust it
so fish echoes are clearly displayed with minimal noise on the
screen. Too high a setting not only displays excess noise and
makes it difficult to discriminate wanted echoes but also causes
seabed echoes to be painted in strong colors, resulting in echoes
being masked by seabed reflections. Normally, set the control
somewhere between positions “3” and “7”.
Gain low
Gain proper Gain high
Figure 2-2 Gain settings and resulting pictures
Measuring Range and Bearing to a Target
Operate the trackball to place the trackball mark on the target
you want to measure the range and bearing. The range and bear-
ing appear at the upper left corner on the screen.
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ª
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B
Figure 2-3 Location of range and bearing indications
Note: The bearing is shown in either 360° or 180° indication
relative to ship’s heading. In the latter case, bearing (“B”) is
indicated as follows:
B P ------- on the port side
B S ------- on the starboard side