Daymark
A daymark is a navigational aid for sailors and pilots, distinctively marked to maximize its visibility in daylight.[1]
![](../I/The_Daymark%252C_St_Martins.jpg.webp)
Daymark on St Martin's, Isles of Scilly
![](../I/Scharh%C3%B6rnbake_1898.png.webp)
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 |
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Square or rectangular daymark |
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Triangular daymark, point up |
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Triangular daymark, point down |
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Retro reflector |
References
- "Daymark". Oxford English Dictionary (Online ed.). Oxford University Press. Retrieved 4 October 2021. (Subscription or participating institution membership required.)
- "Nautical Terms for boating and marine industry terminology". www.marineinstitute.org. Archived from the original on 2003-12-17. Retrieved 2017-03-08.
- Light List, Volume II, Atlantic Coast. Washington, DC: US Government Printing Office. 2015. pp. ix.
- 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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