Furuno 1823C manual Reducing Precipitation Clutter, Adjusting the A/C Rain, Rain setting window

2. RADAR OPERATION

5.When the radar source is the Model 1800/1900 series, A/C SEA and A/C RAIN can be automatically adjusted. Press the A/C AT ON/OFF soft key to select ON or OFF as appropriate. When turned on, it overrides A/C SEA and A/C RAIN settings.

6.Press the [GAIN] key on the front panel or RETURN soft key to finish.

2.6Reducing Precipitation Clutter

The vertical beamwidth of the antenna is designed to see surface targets even when the ship is rolling. However, by this design the unit will also detect precipitation clutter (rain, snow, hail, etc.) in the same manner as normal targets. Precipitation clutter shows as random dots on the screen.

2.6.1Adjusting the A/C RAIN

When echoes from precipitation mask solid targets, adjust the A/C RAIN to split up these unwanted echoes into a speckled pattern, making recognition of solid targets easier.

1.Press the [GAIN] key.

2.Press the A/C RAIN soft key to show the A/C RAIN window.

A/C RAIN

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A/C RAIN setting window

3.Rotate the [ENTER] knob to adjust the A/C RAIN. The current level is shown on the A/C RAIN level bar in the A/C RAIN window, and the range of adjustment is 0 to 100(%). Do not overadjust – weak echoes may be missed.

4.Press the [GAIN] key on the front panel or RETURN soft key to finish.

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