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Daymark

From Wikipedia, the free encyclopedia
(Redirected from Day marker)
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, and standard colours are red, green, orange, yellow, and black.[2]

Notable daymarks

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Symbols used on US charts

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Chart symbols used by the US National Oceanic and Atmospheric Administration Department, 2013.[4]

Paper chart Simplified Simplified symbol name
Square or rectangular daymark
Triangular daymark, point up
Triangular daymark, point down
Retro reflector

See also

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References

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  1. ↑ "daymark". Oxford English Dictionary (online ed.). Oxford University Press. Retrieved 2021-10-04. (Subscription or participating institution membership required.)
  2. 1 2 "Nautical Terms for boating and marine industry terminology". www.marineinstitute.org. Archived from the original on 2003-12-17. Retrieved 2026-04-18.
  3. ↑ Light List, Volume II, Atlantic Coast. Washington, DC: US Government Printing Office. 2015. pp. ix.
  4. ↑ US Chart No. 1: Symbols, Abbreviations and Terms used on Paper and Electronic Navigational Charts. Department of Commerce National Oceanic and Atmospheric Administration Department of Defense National Geospatial-Intelligence Agency. 2013. p. 86.
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  • Wiktionary logo The dictionary definition of daymark at Wiktionary
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