panpan
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, but for the time being, does not pose an immediate danger to anyone's life or to the vessel itself. This is referred to as a state of "urgency". This is distinct from a mayday call (distress signal), which means that there is imminent danger to life or to the continued viability of the vessel itself. Radioing "pan-pan" informs potential rescuers (including emergency services and other craft in the area) that an urgent problem exists, whereas "mayday" calls on them to drop all other activities and immediately begin a rescue.
The Morse code signal "XXX" ( ▄▄▄ ▄ ▄ ▄▄▄ ▄▄▄ ▄ ▄ ▄▄▄ ▄▄▄ ▄ ▄ ▄▄▄ ), which has the same meaning that "pan-pan" does in radiotelephony, was first defined by the International Radiotelegraph Convention of 1927.
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