Rain or Snow Clutter
The radar can see echoes from rain or snow. Returns from storm
areas and rain squalls consist of countless small echoes that
continuously change size, intensity and position. These returns
sometimes appear as large hazy areas, depending on the intensity
of the rainfall or snow in the storm cell.
Interference
When two or more radar-equipped vessels are operating within
range of each other mutual radar interference can occur. This
usually appears as a spiral of small dots from the display centre This
type of interference is most noticeable at long ranges.
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E-Series Widescreen User reference