Seiwa MDS-18910R - Manual (Page 11)

MDS-1R/8R/9R/10R Installation
Radar interference
If another boat's radar is operating on the same frequency as yours, it can create interference
on your display. The interference usually appears as spiral or radial patterns. This radar has
an interference rejection control to eliminate interference. Turn it on to reduce or eliminate
the interference.
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Fig.2-8 Radar interference
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Radar inrterference