Furuno FAR-2107 - Manual (Page 54)

1. RADAR OPERATION
1-28
1.18 Suppressing Rain Clutter
Use the AUTO RAIN and A/C RAIN to suppress rain clutter. AUTO RAIN
suppresses rain clutter in the picture and A/C RAIN suppresses clutter picked up
by the antenna.
1.18.1 Turning AUTO RAIN on or off
1. Use the trackball to select the AUTO RAIN indication at the left side of the
screen.
2. Push the left button to choose AUTO RAIN setting desired. The higher the
number the greater the degree of rain clutter suppression. OFF turns off the
AUTO RAIN feature.
Note: AUTO RAIN can also be adjusted from the PICTURE box.