British mariners signaling other ships during the First World War. Morse code was a highly visible way of communication that could be projected to shore or other ships. Britannica Image quest
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The Great War started in 1914 when Franz Ferdinand was assassinated. One of most important pieces of equipment was the Telephone, witch the United States Army set up 2,000 miles worth of poles and 28,000 miles worth of wire, but they were easily intercepted by the Germans, but its was worth the risk due to the speed of the communication according to the United States marine museum.
There were many types of communication types in the First World War, including Telephones, Telegraph, radio, signal lights, flags, and most importantly animal messengers.
British mariners signaling other ships during the First World War. Morse code was a highly visible way of communication that could be projected to shore or other ships. Britannica Image quest