A daymark is a navigational aid for sailors and pilots, distinctively marked to maximize its visibility in daylight.
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. 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. Standard signboard shapes are square, triangular, and rectangular, and standard colours are red, green, orange, yellow, and black.
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 Mässkär 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.
Paper chartSimplifiedSimplified symbol nameSquare or rectangular daymarkTriangular daymark, point upTriangular daymark, point downRetro reflector
See also Landmark Lighthouse Sea mark
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