Description
Description
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Day shapes or day markers are mast head signals comprised of geometric shapes.
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These signals convey the status of a vessel on navigable waters during daylight hours.
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The four basic shapes of the markers are ball, cylinder, cone, and diamond.
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The day shapes are used alone or in combination to provide a range of status updates visible during the day and are intended to mimic the navigation light requirement during nightfall or poor visibility.
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Day shapes are required to be deployed from sunrise to sunset and are typically hung from a mast for ease of visibility from a distance.
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DIA.: 610
