Note :
As the number of ships on the oceans increased, merchant ships found they needed to communicate with each other as well. The use of signal flags by ships from all over the world began in the 1800s and continues to the present. The modern International Code of Signals consists of 40 letter, numeral, and special purpose flags. Although modern ships have radar, GPS, and radio communications, merchant as well as military vessels are required to carry signal flags and use the International Code of Signals as they travel the world’s oceans.
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