Furuno CSH-84, CSH-83 manual Adjusting the Gain, Measuring Range and Bearing to a Target

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 “5”.

Gain low Gain proper Gain high

Figure 2-4 Gain settings and resulting picture

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.

»

»»

B

Figure 2-5 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

B

P ------- on the port side

S ------- on the starboard side

2-7