International Code of Signals maritime flags were first drafted by the British Board of Trade in 1855 and adopted as a world-wide standard on 1 January 1901. It is used for communications with ships, but also occasionally used by geocaching mystery caches (puzzle caches), CTFs and various logic puzzles.
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International Code of Signals flags
- International maritime signal flags refers to various flags used to communicate with ships, associated with the International Codes of Signals (ICS).
- Single flags can also have specific meanings (urgent, important or common messages) other that representing a letter. The meanings are listed here.
- The International Code of Signals flags officially came into worldwide operation on 1 January 1901.
- The International Code of Signals is currently maintained by the International Maritime Organization.
International Codes of Signals flags, and variants of it, are used occasionally in geocaching mystery caches (puzzle caches), CTFs and logic puzzles. Look specifically for the color combinations to recognize it.
The images above represents the text "BOX".