The " "'next Japanese " prosign "', when sent by a Morse code operator indicates to the receiving operator that the sending operator will be immediately " shifting " the communications protocol from International Morse code symbols to " Japanese"
12.
The contacts could operate an audio oscillator for the study of International Morse Code ( used by radio ), or a sounder for the study of American Morse Code ( used by railroads ), or a light bulb ( Aldis Lamp-used by Navy ship to ship or by Heliograph ).
13.
Thus, under the modern notation, the distress signal becomes SOS . ( In International Morse Code, VTB, IJS, VGI, and SMB, among others, would also correctly translate into the "'??? ???"'distress call sequence, but traditionally only SOS is used .)
14.
When sent by a Japanese Wabun code operator, is a prosign symbol in the Japanese Wabun code that indicates to the receiving operator that the sending operator will be immediately shifting the communications protocol status from the Japanese Wabun code Kana character symbols to International Morse code encoding and to interpret all the symbols that follow as International Morse code and not the Japanese Wabun code Kana symbols.
15.
When sent by a Japanese Wabun code operator, is a prosign symbol in the Japanese Wabun code that indicates to the receiving operator that the sending operator will be immediately shifting the communications protocol status from the Japanese Wabun code Kana character symbols to International Morse code encoding and to interpret all the symbols that follow as International Morse code and not the Japanese Wabun code Kana symbols.
16.
In addition to Morse code characters and prosign symbols there are also internationally agreed communications protocols or patterns of communication, international Morse code abbreviations, and established codes such as the : ACP-131 brevity codes : the Q code, Z code, RST code and commonly encountered numbers from older telegraph era codes such as the Phillips Code to assist with efficient and quick Morse code conversations.
17.
At the second International Radiotelegraphic Convention, held in Berlin in 1906, Germany's " " distress signal of three-dots / three-dashes / three-dots ( "'??? ???"') was adopted as the international Morse code distress signal . ( This distress signal soon became known as " SOS ".
18.
The " "'distress " prosign "'is the International Morse code distress signal to be used ONLY in EMERGENCY situations to draw immediate " attention " and to " request immediate help either to save lives or to protect the imminent destruction of significant property " . may be interpreted in English as " " Save Our Souls " ".
19.
The distress signal CQD was not a prosign per se; rather, it was a special Marconi code signal comprising the separate, non-concatenated characters C, Q and D . The use of CQD was phased out in favor of around the time of the RMS Titanic sea disaster, and now for over one hundred years, the Morse prosign has been used under several issues of the " Safety of Life at Sea " or SOLAS Convention regulations as a world-wide International Morse code " distress signal ".
