Daymark

Daymark on St Martin's, Isles of Scilly
Triangular daymark in the marina of Ystad, 2021
Scharhörn daymark in 1898

A daymark is a navigational aid for sailors and pilots, distinctively marked to maximize its visibility in daylight.[1]

The word is also used in a more specific, technical sense to refer to a signboard or daytime identifier that is attached to a day beacon or other aid to navigation.[2] In that sense, a daymark conveys to the mariner during daylight hours the same significance as the aid's light or reflector does at night.[3] Standard signboard shapes are square, triangular, and rectangular, while the standard colours are red, green, orange, yellow, and black.[2]

  1. ^ "daymark". Oxford English Dictionary (Online ed.). Oxford University Press. Retrieved 2021-10-04. (Subscription or participating institution membership required.)
  2. ^ a b "Nautical Terms for boating and marine industry terminology". www.marineinstitute.org. Archived from the original on 2003-12-17. Retrieved 2017-03-08.
  3. ^ Light List, Volume II, Atlantic Coast. Washington, DC: US Government Printing Office. 2015. pp. ix.

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