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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 ] Various navies have flag systems with additional flags and codes, and other flags are used in special uses, or have historical significance.
The International Code of Signals (INTERCO) is an international system of signals and codes for use by vessels to communicate important messages regarding safety of navigation and related matters. Signals can be sent by flaghoist , signal lamp ("blinker"), flag semaphore , radiotelegraphy, and radiotelephony.
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).
A designator flag is used to indicate if a flaghoist signal is meant to be interpreted as an ICS signal or as a naval signal. The U.S. Navy uses a set of 68 flags, including flags for each letter of the alphabet and each numeral to convey messages of tactical or administrative nature. [2] [better source needed]
Despite the NATO sharing the same alphabetic flags as the International Code of Signals, the meanings are not shared between the codes. Furthermore, the NATO code uses a number of special flags which alter the meaning of the hoist. All below signals have been taken from a 2003 unclassified NATO codebook. [5]
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).
For Pride month 2023, learn the significance of different LGBTQ flags, including the Gilbert Baker Pride Flag, Traditional Pride Flag, and Progress Pride Flag.
Hungary - List of Hungarian flags § Naval flags; India - List of Indian flags § Navy; Ireland - List of flags of Ireland § Naval service; Japan - List of Japanese flags § Self-Defense Force and Imperial Army/Navy; Latvia - List of Latvian flags § Military flags; Norway - List of Norwegian flags § Flags of the Navy; Poland - List of Polish ...