Signals can be sent by flaghoist, signal lamp ("blinker"), flag semaphore, radiotelegraphy, and radiotelephony. The International Code is the most recent evolution of a wide variety of maritime flag signalling systems.

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. [2]

board: keep well clear of me." or "I wish to communicate with you." "I wish to communicate with you by...": Morse signaling by hand-flags or arms; Loud hailer (megaphone); Morse signaling lamp; Sound signals.

The document provides information on letter flags used in the International Code of Signals (ICS), including the phonetic name, design, and meaning of each flag when used as a single flag or with numeric complements.

Today, Navy signal flags are used when communicating among allied forces, while the ICS is used with all other vessels. The code/answer pennant precedes all signals using the ICS. Navy signalmen transmit messages while maintaining radio …

Signaling at sea: the International Code of Signals (ICS) is under the management of the United Nations Maritime Organization (UNMO). Each major seafaring country still publishes the ICS for use of its mariners. The flags listed below are international signals used by ships at sea.

Below are some sample signals from the ICS. Warships do not normally use the ICS as such to communicate with each other, but rather use their own navy's particular code employing the same set of flags.

Dec 14, 2016 · Two-letter signals for other messages, sometimes followed with a numerical "complement" which supplements or modifies the message. Three-letter signals beginning with "M"; these are the Medical Signal Codes.

Each letter/numeral was assigned a flag. To save time when signaling each flag has an assigned meaning to communicate very urgent or common messages. When paired in two's, flags take on more specific meanings: Numerals appended to two flags permit for more detailed messages... Can I come alongside?

Letter Flags (with ICS Meaning) A (Alfa) "I have a diver down; keep well clear at slow speed." With three numerals, azimuth or bearing. B (Bravo) "I am taking in, or discharging, or carrying dangerous goods." (Originally used by the Royal Navy specifically for military explosives.) C (Charlie) "Affirmative." With three numerals, course in ...