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Day shapes are mast head signals visually indicating the status of a vessel to other vessels on navigable waters during daylight hours whether making-way, anchored, or aground. These signals consist of a set of simple geometric shapes: ''ball, cylinder, cone,'' and ''diamond'' that are displayed, hung from a mast, in a prescribed manner to indicate a vessel's operational status; some of these signals maybe somewhat involved. The meanings of the shapes are defined by the International Regulations for Preventing Collisions at Sea. Day shapes are black in color and their sizes are determined by the COLREG, for instance the size of the ''ball'' is not less than .6 meter diameter. The vertical distance between shapes is at least 1.5 meters. Vessels of less than 20 meters length may use shapes of smaller size commensurate with the size of the vessel. Day shapes of standard and reduced sizes are both commercially available. Day shapes are commonly constructed from a light weight frame covered with fabric and are designed to be collapsible for ease of storage. Day shapes are designed to correspond to the various navigation lights required to be shown at night, and are required to be complied with by day from sunrise to sunset. The appropriate lights may also be displayed during the day at times of restricted visibility or other necessary circumstances. Vessels under 7 meters are generally not required to display day shapes even if they are required to display lights at night. A square black flag displayed over the ''ball'' may be used as a distress signal. Some of the most common signals are as follows: Notice: The information in this article is not an adequate substitute for the regulations and should not be relied upon for navigation. ==See also== *Marine navigation lights *International Regulations for Preventing Collisions at Sea *US Coast Guard *International Maritime Organization 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Day shapes」の詳細全文を読む スポンサード リンク
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