Day shapes: Difference between revisions
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'''Day shapes''' are mast head [[Maritime flag signalling|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.<ref>{{cite book|last1=Commandant US Coast Guard|title=Navigation Rules: International and Inland|date=25 March 1999|publisher=US Department of Transportion, US Coast Guard|location=PART C—LIGHTS AND SHAPES|pages=38-112|edition=COMDTINST 16672.2D|accessdate=7 June 2014}}</ref> The meanings of the shapes are defined by the [[International Regulations for Preventing Collisions at Sea]]. |
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[[File:AMarcasDiurnas.PNG|thumb|right|Day |
[[File:AMarcasDiurnas.PNG|thumb|right|Day shapes from COLREG]] |
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Day |
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.<ref>{{cite book|last1=Commandant US Coast Guard|title=Navigation Rules: International and Inland|date=25 March 1999|publisher=US Department of Transportation: US Coast Guard|location=ANNEX I—POSITIONING AND TECHNICAL DETAILS OF LIGHTS AND SHAPES|page=140|edition=COMDTINST M16672.2D|accessdate=7 June 2014}}</ref> 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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[[File:US Navy 080730-N-7571S-010 Quartermaster Seaman Andrew Dobrzykowski lowers day shapes Ball, Diamond, Ball signaling the end of restricted maneuvering.jpg|thumb|right|A US Navy Seaman lowers day shapes: Ball, Diamond, Ball signaling the end of restricted maneuvering]] |
[[File:US Navy 080730-N-7571S-010 Quartermaster Seaman Andrew Dobrzykowski lowers day shapes Ball, Diamond, Ball signaling the end of restricted maneuvering.jpg|thumb|right|A US Navy Seaman lowers day shapes: Ball, Diamond, Ball signaling the end of restricted maneuvering]] |
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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.<ref>{{cite book|last1=Commandant US Coast Guard|title=Navigation Rules: International and Inland|date=25 March 1999|publisher=US Department of Transportation: US Coast Guard|location=PART C—LIGHTS AND SHAPES|page=38|edition=COMDTINST M16672.2D|accessdate=7 June 2014}}</ref> Vessels under 7 meters are generally not required to display day shapes even if they are required to display lights at night.<ref>{{cite book|last1=Commandant US Coast Guard|title=Navigation Rules: International and Inland|date=25 March 1999|publisher=US Department of Transportation: US Coast Guard|location=PART C—LIGHTS AND SHAPES|page=110|edition=COMDTINST M16672.2D|accessdate=7 June 2014}}</ref> |
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A square black flag displayed over the ''ball'' may be used as a distress signal.<ref>{{cite book|last1=Commandant US Coast Guard|title=Navigation Rules: International and Inland|date=25 March 1999|publisher=US Department of Transportation: US Coast Guard|location=PART C—LIGHTS AND SHAPES|page=126|edition=COMDTINST M16672.2D|accessdate=7 June 2014}}</ref> |
A square black flag displayed over the ''ball'' may be used as a distress signal.<ref>{{cite book|last1=Commandant US Coast Guard|title=Navigation Rules: International and Inland|date=25 March 1999|publisher=US Department of Transportation: US Coast Guard|location=PART C—LIGHTS AND SHAPES|page=126|edition=COMDTINST M16672.2D|accessdate=7 June 2014}}</ref> |
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Revision as of 01:45, 19 August 2014
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.[1] 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.[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.
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 & Power | Cone | > 12m |
| Anchored | Ball | > 7m (not in channel) > 20m (in anchorage) |
| Constrained by Draft | Cylinder | |
| Aground | 3 Balls (vert. line) | > 12m |
| Not Under Command | 2 Balls (vert. line) | > 12m |
| Restricted in Ability to Maneuver | 1 Ball+1 Diamond+1 Ball | > 12m (except dive boats) |
| Fishing (commercial) | 2 Cones (vert. line) | > 20m (but must display (nets or trawling) basket shape |
| Vessel Towing | Diamond | Tow > 200m |
| Vessel Being Towed | Diamond | Tow > 200m |
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
References
- ^ Commandant US Coast Guard (25 March 1999). Navigation Rules: International and Inland (COMDTINST 16672.2D ed.). PART C—LIGHTS AND SHAPES: US Department of Transportion, US Coast Guard. pp. 38–112.
{{cite book}}:|access-date=requires|url=(help) - ^ Commandant US Coast Guard (25 March 1999). Navigation Rules: International and Inland (COMDTINST M16672.2D ed.). ANNEX I—POSITIONING AND TECHNICAL DETAILS OF LIGHTS AND SHAPES: US Department of Transportation: US Coast Guard. p. 140.
{{cite book}}:|access-date=requires|url=(help) - ^ Commandant US Coast Guard (25 March 1999). Navigation Rules: International and Inland (COMDTINST M16672.2D ed.). PART C—LIGHTS AND SHAPES: US Department of Transportation: US Coast Guard. p. 38.
{{cite book}}:|access-date=requires|url=(help) - ^ Commandant US Coast Guard (25 March 1999). Navigation Rules: International and Inland (COMDTINST M16672.2D ed.). PART C—LIGHTS AND SHAPES: US Department of Transportation: US Coast Guard. p. 110.
{{cite book}}:|access-date=requires|url=(help) - ^ Commandant US Coast Guard (25 March 1999). Navigation Rules: International and Inland (COMDTINST M16672.2D ed.). PART C—LIGHTS AND SHAPES: US Department of Transportation: US Coast Guard. p. 126.
{{cite book}}:|access-date=requires|url=(help)