Daymark

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

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

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 does the aid's light or reflector at night.[3] Standard signboard shapes are square, triangular and rectangular; and the standard colours are red, green, orange, yellow and black.[2]

Notable daymarks

Symbols used on US charts

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
Look up daymark in Wiktionary, the free dictionary.

References
  1. "Daymark". Oxford English Dictionary (Online ed.). Oxford University Press. Retrieved 4 October 2021. (Subscription or participating institution membership required.)
  2. "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.
  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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