Eighteen separate signal flags (see chart) were used to make over 70,000 possible messages. It came in two parts: the first containing universal and international signals, and the second British signals only. What is now the International Code of Signals was drafted in 1855 by the British Board of Trade and published in 1857 as the Commercial Code. The International Code of Signals was preceded by a variety of naval signals and private signals, most notably Marryat's Code, the most widely used code flags prior to 1857. ![]() The International Code is the most recent evolution of a wide variety of maritime flag signalling systems. ![]() Signals can be sent by flaghoist, signal lamp ("blinker"), flag semaphore, radiotelegraphy, and radiotelephony. 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. ![]() Maritime communication method How to say "Communicate with me!" in nine languages.
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