Winter buoy

From International Dictionary of Marine Aids to Navigation
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A buoy, often unlighted, used as a replacement for a light buoy or a large unlighted buoy in certain areas during the winter months when other aids to navigation are temporarily withdrawn.

Note 1:

The term ice buoy is used when the buoy is designed to withstand the effects ofice.

Note 2:

In German, the term Winterbetonnung means the state of the buoyage system as modified during the winter months.

Note 3:

The French term "bouee d'hiver" is not much used in France.

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

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