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The radiotelephony message PAN-PAN is the international standard urgency signal that someone aboard a boat, ship, aircraft, or other vehicle uses to declare that they need help and that the situation is urgent, [1] [2] [3] but for the time being, does not pose an immediate danger to anyone's life or to the vessel itself. [4]
The first US ship to send a wireless distress call in 1905 simply sent HELP (in both International Morse and American Morse code). [3]: 218 On 7 December 1903, Ludwig Arnson was a wireless operator aboard the liner SS Kroonland when the ship lost a propeller off the Irish coast. His call of CQD brought aid from a British cruiser.
A Mayday message consists of the word "mayday" spoken three times in succession, which is the distress signal, followed by the distress message, which should include: Name of the vessel or ship in distress; Its position (actual, last known, or estimated expressed in lat/long or in distance/bearing from a specific location)
The International Code of Signals (INTERCO) is an international system of signals and codes for use by vessels to communicate important messages regarding safety of navigation and related matters. Signals can be sent by flaghoist , signal lamp ("blinker"), flag semaphore , radiotelegraphy, and radiotelephony.
DSC is primarily intended to initiate ship-to-ship, ship-to-shore and shore-to-ship radiotelephone and MF/HF radiotelex calls. DSC calls can also be made to individual stations, groups of stations, or "all stations" in one's radio range. Each DSC-equipped ship, shore station and group is assigned a unique 9-digit Maritime Mobile Service Identity.
Of the three distress and urgency calls, Sécurité is the least urgent. Sécurité: A radio call that usually issues navigational warnings, meteorological warnings, and any other warning needing to be issued that may concern the safety of life at sea, yet may not be particularly life-threatening. Pan-pan: This is the second most important call ...
Roman ship represented in a fresco of the 2nd or 3rd century in the port city of Ostia. The inscriptions reflect the name of the ship (Isis Giminiana), the name of the captain or magister (Farnaces, at the helm) and the name of the owner (Arascanius, in charge of the cargo). [4] Roman sarcophagus from the 3rd century.
Message precedence is an indicator attached to a message indicating its level of urgency, and used in the exchange of radiograms in radiotelegraph and radiotelephony procedures. Email header fields can also provide a precedence flag.