Furuno GD-1700, Operator'S Manual

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3. RADAR OPERATION
3-5
5.
When the radar source is the Model 1800/1900 series radar,
A/C SEA and
A/C RAIN can be automatically adjusted. Press the A/C AT 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.
3.6 Reducing 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.
3.6.1 Adjusting 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
0
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 the A/C RAIN – weak target
echoes may be missed.
4. Press the [GAIN] key on the front panel or RETURN soft key to finish.