The "repeater" flags are used to repeat a flag previously used in a sequence. There are 26 flags to represent the alphabet, 10 to represent the numbers 0 through 9, three "repeaters", and an answering flag, to signify that a message has been received. The International Code of Signals (ICS), is made up of 40 flags. It is unimportant that the sender and receiver speak different languages as each is using a book in their own language which keys equivalent messages to the same code. One of the most interesting aspects of the ICS is that all of the standardized messages are the same for nine languages including English, French, Italian, German, Japanese, Spanish, Norwegian, Russian and Greek. The first flag hoisted (a designator flag) indicates whether the signal should be interpreted as an ICS or naval signal. Naval ships generally do not use the ICS to communicate but rather their own navy's, or group's (e.g. Today the code, known as the International Code of Signals (ICS), is made up of 40 flags. The code was subsequently modified in 1932 when six flags were added to accommodate different languages, and again in 1969 when more flags were added to accommodate Russian and Greek and the range of messages was reduced to focus on navigaion and safety. This original form of the code, still in use today, included 18 signal flags that could convey up to approximately 1,000 messages. Marryat's Code, published in 1817, was the first general system of signalling for use by merchant vessels and the most widely used system prior to 1857.īy the mid 19th century, in 1855, the first International Code of Signals, the Commercial Maritime Code, was drafted and then published in 1857, by the British Board of Trade in an effort to define a standard form of communication between vessels at sea and shore. It was not until the early 18th century, that navies began to standardize the messages. Early use of flag signalling was however primitive and inconsistent. For example, the Roman navy used red flags or cloaks as signals between vessels. The history of Flag signalling dates back thousands of years, when it was primarily used in military situations.
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