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Standard chart of "International Flags and Pennants" of the International Code of Signals (also known as "Pub. 102") "The purpose of the International Code of Signals is to provide ways and means of communication in situations related essentially to safety of navigation and persons, especially when language difficulties arise."
Two sailing ships dressed overall with their signal flags. International maritime signal flags are various flags used to communicate with ships. The principal system of flags and associated codes is the International Code of Signals. [1]
Flags may have individual significance as signals, or two or more flags may be manipulated so that their relative positions convey symbols. Flag signals allowed communication at a distance before the invention of radio and are still used especially in connection with ships.
Maritime flag signalling, generally flaghoist signalling, is the principal means other than radio by which ships communicate to each other or to shore (distinguished from flags showing nationality, ownership, or (for naval vessels) organizational status).
An Electronic Navigational Chart (ENC) is a digital representation of a real-world geographical area for the purpose of Marine navigation.Real-world objects and areas of navigational significance, or to a lesser degree - informational significance, are portrayed through Raster facsimiles of traditional paper charts; or more commonly through vector images, which are able to scale their relative ...
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 sailor lowers day shapes "ball, diamond, ball", signaling the end of restricted maneuvering
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Official number – a ship identifier number assigned to merchant ships by their country of registration, this system has been superseded by the IMO number system; Ship name – a proper noun chosen at the shipowner's discretion; may change several times during the vessel's lifetime