Ring around

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Ring around (in secondary radar)

1. The undesired triggering of a transponder by its own transmitter.

2. The triggering of a transponder at all bearings causing a ring presentation on a P.P.I.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

charge current


International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM