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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 does not have a light and so is usually only visible during daylight hours, although a lighthouse may be built as a daymark. Some disused lighthouses remain useful by serving as daymarks.

The Archirondel and Le Hocq towers on Jersey, built for purposes of coastal defence, now serve as daymarks.

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