How To Reduce The Sea Clutter; How To Reduce The Rain Clutter - Furuno NavNet TZtouch3 Series Operator's Manual

6. RADAR
6.4

How to Reduce the Sea Clutter

The reflected echoes from waves appear at the central part of the screen and have
the name "sea clutter". The sea clutter increases in width as the height of waves and
the height of the antenna above the water increase. If the sea clutter is strong, targets
can be hidden inside the clutter, like in the right-hand figure.
When the sea clutter hides targets, adjust the sea control (automatically or manually)
to reduce the clutter. Like with gain, sea clutter can be adjusted from the pop-up menu
or data area. See the procedures in section 6.3.
For automatic sea clutter suppression, there are two methods: [Advanced] and
[Coastal]. [Advanced] provides for standard suppression of sea clutter and is intended
for normal use. [Coastal] suppresses sea clutter further than does [Advanced] and
paints land and target echoes thicker. Use [Coastal] when you are cruising along a
coastline.
To select an automatic sea clutter suppression method, open the [Layers] menu, tap
[Advanced] or [Coastal] at [Auto Sea Mode].
6.5

How to Reduce the Rain Clutter

When your ship is in or near rain or snow, the reflections from rain or snow appear on
the screen. These reflections have the name "rain clutter". When the rain clutter is
strong, targets in or near the rain clutter are hidden in the clutter. Reflections from the
rain clutter are easily identified from true targets by their wool-like appearance.
The rain control breaks the continuous display of rain or snow reflections into a ran-
dom pattern. The rain control also helps to reduce the target clutter in good weather
in busy harbors. When the rain clutter hides targets, adjust the rain control (automatic
or manual) to reduce the clutter.
Like with gain, rain clutter can be adjusted from the pop-up menu or data area. See
the procedures in section 6.3.
6-4
Sea clutter at
screen center
Sea control adjusted;
sea clutter suppressed