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(d) Multiple echo
Multiple echoes are developed by multiple reflections caused by a building or large vessels
that has large vertical surfaces. These echoes are spaced at an equal interval, with the one
that is closest to the own ship being the true echo.
(e) Radar interference
If there is a radar that uses the same frequency as that of the own ship near the own ship,
interferences caused by that radar appear on the PPI screen. These interferences appear as
clusters of spots of varying patterns. Since they do not occur at the same location with time,
they can easily be distinguished from true echoes.
Radar interferences can be reduced or eliminated by choosing "ON" from "FUNCTION"-"IR".
[Examples of radar interferences]
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