Range rings

From International Dictionary of Marine Aids to Navigation
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4-3-330

A visual presentation on a radar display, appearing as a set of concentric circles, centred on own ship's position and spaced by equal increments in range.




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

second

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