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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
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Day shapes are black in color and their sizes are determined by the ColRegs; for example, the size of the ball is not less than 0.6 metres (2.0 ft). The vertical distance between shapes is at least 1.5 metres (4.9 ft). Vessels of less than 20 metres (66 ft) length may use shapes of
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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.
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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—
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42:—that are displayed, hung from a mast, in a prescribed manner to indicate a vessel's operational status; some of these signals may be somewhat involved. The meanings of the shapes are defined by the
287:(COMDTINST M16672.2D ed.). ANNEX I—POSITIONING AND TECHNICAL DETAILS OF LIGHTS AND SHAPES: US Department of Transportation: US Coast Guard. p. 141. Archived from
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252:(COMDTINST 16672.2D ed.). PART C—LIGHTS AND SHAPES: US Department of Transportation, US Coast Guard. pp. 38–113. Archived from
392:(COMDTINST M16672.2D ed.). PART C—LIGHTS AND SHAPES: US Department of Transportation: US Coast Guard. p. 126. Archived from
357:(COMDTINST M16672.2D ed.). PART C—LIGHTS AND SHAPES: US Department of Transportation: US Coast Guard. p. 110. Archived from
322:(COMDTINST M16672.2D ed.). PART C—LIGHTS AND SHAPES: US Department of Transportation: US Coast Guard. p. 38. Archived from
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A US Navy sailor lowers day shapes "ball, diamond, ball", signaling the end of restricted maneuvering
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A square black flag displayed over the ball may be used as a distress signal.
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not required if < 7 m and where vessels normally do not navigate
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United States Coast Guard, Navigation Center, Navigation Rules On-Line
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International
Regulations for Preventing Collisions at Sea
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Some of the most common signals (see Day shapes diagram):
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International
Regulations for Preventing Collisions at Sea
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even if they are required to display lights at night.
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ball, diamond, ball (2 diamonds - safe side to pass)
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Day shapes are designed to correspond to the various
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140:4,11. Fishing (with restricted maneuvrability)
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450:This article related to water transport is a
426:International Maritime Organization: COLREGS
383:Commandant US Coast Guard (25 March 1999).
348:Commandant US Coast Guard (25 March 1999).
313:Commandant US Coast Guard (25 March 1999).
278:Commandant US Coast Guard (25 March 1999).
243:Commandant US Coast Guard (25 March 1999).
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386:Navigation Rules: International and Inland
351:Navigation Rules: International and Inland
316:Navigation Rules: International and Inland
281:Navigation Rules: International and Inland
246:Navigation Rules: International and Inland
172:7,10. Restricted in ability to manoeuvre
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210:International Maritime Organization
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143:2 cones (apexes together)
220:Marine navigation lights
183:8. Constrained by draft
511:Nonverbal communication
53:Day shapes from ColRegs
521:Optical communications
129:3. Vessel being towed
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531:Water transport stubs
194:3 balls (vert. line)
154:2 balls (vert. line)
151:5. Not under command
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526:Nautical terminology
135:Tow > 200 m
124:Tow > 200 m
516:Maritime signalling
399:on 25 December 2018
364:on 25 December 2018
329:on 25 December 2018
294:on 25 December 2018
259:on 25 December 2018
431:2015-05-11 at the
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191:9. Aground
46:(ColRegs).
495:Categories
231:References
89:Day shape
20:Day shapes
186:Cylinder
429:Archived
204:See also
165:3 balls
132:Diamond
121:Diamond
32:cylinder
403:15 July
368:15 July
333:15 July
298:15 July
263:15 July
40:diamond
24:signals
38:, and
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100:Ball
452:stub
405:2019
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265:2019
36:cone
28:ball
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