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 may be somewhat involved.[1] The meanings of the shapes are defined by the International Regulations for Preventing Collisions at Sea (ColRegs).
Day shapes from ColRegs
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 smaller size commensurate with the size of the vessel.[2] 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.
A US Navy seaman lowers day shapes "ball, diamond, ball", signaling the end of restricted maneuvering
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.[3] Vessels under 7 meters are generally not required to display day shapes even if they are required to display lights at night.[4]
A square black flag displayed over the ball may be used as a distress signal.[5]
Some of the most common signals are as follows:
Navigation status
Day shape
Restriction
Vessel under sail and power
Cone
> 12 m
Anchored
Ball
> 7 m (not in channel) > 20 m (in anchorage)
Constrained by draft
Cylinder
Aground
3 balls (vert. line)
> 12 m
Not under command
2 balls (vert. line)
> 12 m
Restricted in ability to maneuver
1 ball, 1 diamond, 1 ball
> 12 m (except dive boats)
Fishing (commercial)
2 cones (vert. line)
> 20 m (but must display nets or trawling basket shape)
^Commandant US Coast Guard (25 March 1999). Navigation Rules: International and Inland(PDF) (COMDTINST 16672.2D ed.). PART C—LIGHTS AND SHAPES: US Department of Transportation, US Coast Guard. pp. 38–113. Retrieved 15 July 2019.
^Commandant US Coast Guard (25 March 1999). Navigation Rules: International and Inland(PDF) (COMDTINST M16672.2D ed.). ANNEX I—POSITIONING AND TECHNICAL DETAILS OF LIGHTS AND SHAPES: US Department of Transportation: US Coast Guard. p. 141. Retrieved 15 July 2019.
^Commandant US Coast Guard (25 March 1999). Navigation Rules: International and Inland(PDF) (COMDTINST M16672.2D ed.). PART C—LIGHTS AND SHAPES: US Department of Transportation: US Coast Guard. p. 38. Retrieved 15 July 2019.
^Commandant US Coast Guard (25 March 1999). Navigation Rules: International and Inland(PDF) (COMDTINST M16672.2D ed.). PART C—LIGHTS AND SHAPES: US Department of Transportation: US Coast Guard. p. 110. Retrieved 15 July 2019.
^Commandant US Coast Guard (25 March 1999). Navigation Rules: International and Inland(PDF) (COMDTINST M16672.2D ed.). PART C—LIGHTS AND SHAPES: US Department of Transportation: US Coast Guard. p. 126. Retrieved 15 July 2019.
External links
United States Coast Guard, Navigation Center, Navigation Rules On-Line
International Maritime Organization: COLREGS
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shapes, mast, head, signals, visually, indicating, status, vessel, other, vessels, navigable, waters, during, daylight, hours, whether, making, anchored, aground, these, signals, consist, simple, geometric, shapes, ball, cylinder, cone, diamond, that, displaye. 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 may be somewhat involved 1 The meanings of the shapes are defined by the International Regulations for Preventing Collisions at Sea ColRegs Day shapes from ColRegs 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 smaller size commensurate with the size of the vessel 2 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 A US Navy seaman lowers day shapes ball diamond ball signaling the end of restricted maneuvering 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 3 Vessels under 7 meters are generally not required to display day shapes even if they are required to display lights at night 4 A square black flag displayed over the ball may be used as a distress signal 5 Some of the most common signals are as follows Navigation status Day shape RestrictionVessel under sail and power Cone gt 12 mAnchored Ball gt 7 m not in channel gt 20 m in anchorage Constrained by draft CylinderAground 3 balls vert line gt 12 mNot under command 2 balls vert line gt 12 mRestricted in ability to maneuver 1 ball 1 diamond 1 ball gt 12 m except dive boats Fishing commercial 2 cones vert line gt 20 m but must display nets or trawling basket shape Vessel towing Diamond Tow gt 200 mVessel being towed Diamond Tow gt 200 mMinesweeping 3 balls NavalSee also EditInternational Maritime Organization International Regulations for Preventing Collisions at Sea Marine navigation lights US Coast GuardReferences Edit Commandant US Coast Guard 25 March 1999 Navigation Rules International and Inland PDF COMDTINST 16672 2D ed PART C LIGHTS AND SHAPES US Department of Transportation US Coast Guard pp 38 113 Retrieved 15 July 2019 Commandant US Coast Guard 25 March 1999 Navigation Rules International and Inland PDF COMDTINST M16672 2D ed ANNEX I POSITIONING AND TECHNICAL DETAILS OF LIGHTS AND SHAPES US Department of Transportation US Coast Guard p 141 Retrieved 15 July 2019 Commandant US Coast Guard 25 March 1999 Navigation Rules International and Inland PDF COMDTINST M16672 2D ed PART C LIGHTS AND SHAPES US Department of Transportation US Coast Guard p 38 Retrieved 15 July 2019 Commandant US Coast Guard 25 March 1999 Navigation Rules International and Inland PDF COMDTINST M16672 2D ed PART C LIGHTS AND SHAPES US Department of Transportation US Coast Guard p 110 Retrieved 15 July 2019 Commandant US Coast Guard 25 March 1999 Navigation Rules International and Inland PDF COMDTINST M16672 2D ed PART C LIGHTS AND SHAPES US Department of Transportation US Coast Guard p 126 Retrieved 15 July 2019 External links EditUnited States Coast Guard Navigation Center Navigation Rules On Line International Maritime Organization COLREGS This article related to water transport is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Day shapes amp oldid 1105410295, wikipedia, wiki, book, books, library,
