Engineering:Daymark
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Short description: Daytime aid to navigation
Triangular daymark in the marina of Ystad, 2021
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 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
- Trinity House Obelisk, UK
- Kingswear Daymark, UK
- Tasku beacon tower, Finland
- Keskiniemi beacon tower, Finland
- Hiidenniemi beacon tower, Finland
- Laitakari beacon tower, Finland
- Herring Tower, Langness, Isle of Man
- Le Hocq, Jersey
- La Tour Cârrée, Jersey
- Scharhörnbake, Germany
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
References
- ↑ Daymark (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=Daymark, retrieved 4 October 2021 (Subscription or UK public library membership required.)
- ↑ 2.0 2.1 "Nautical Terms for boating and marine industry terminology". http://www.marineinstitute.org/nautical%20terms.htm#D.
- ↑ 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. pp. 86.
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