A daymark or a day marker is a structure, such as a tower constructed on land, that serves as an aid to navigation by sailors. Similar in concept to a lighthouse, a daymark though does not have a light and so is usually only visible during daylight hours. Some disused lighthouses remain useful by serving as daymarks. The Archirondel and Le Hocq to...
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http://en.wikipedia.org/wiki/Daymark
(from the article `lighthouse`) The daymark requirement of a lighthouse is also important; lighthouse structures are painted to stand out against the prevailing background. Shore ...
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http://www.britannica.com/eb/a-z/d/15
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