Middle grounds

From International Dictionary of Marine Aids to Navigation
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Island or shoal which divides a fairway into two shipping channels; these subsequently join again into a single channel.

Reference: I.H.B. (modified)

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

charge current


Centre of buoyancy

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