ANNEX IV
Distress Signals
1. Need of Assistance
The following signals, used or exhibited either together or separately, indicate distress and need of assistance:(a) a gun or other explosive signal fired at intervals of about a minute;
(b) a continuous sounding with any fog-signalling apparatus;
(c) rockets or shells, throwing red stars fired one at a time at short intervals;
(d) a signal made by radiotelegraphy or by any other signalling method consisting of the group ...---... (SOS) in the Morse Code;
(e) a signal sent by radio telephony consisting of the spoken word "Mayday";
(f) the International Code Signal of distress indicated by N.C.;
(g) a signal consisting of a square flag having above or below it a ball or something resembling a ball;
(h) flames on the vessel (as from a burning tar barrel, oil barrel, etc.);
(i) a rocket parachute flare or a hand flare showing a red light;
(j) a smoke signal giving off orange-colored smoke;
(k) slowly and repeatedly raising and lowering arms outstretched to each side;
(l) the radiotelegraph alarm signal;
(m) the radiotelephone alarm signal;
(n) signals transmitted by emergency position-indicating radio beacons;
(o) approved signals transmitted by radiocommunication systems.
2. The use or exhibition of any of the foregoing signals except for the purpose of indicating distress or need of assistance and the use of other signals which may be confused with any of the above signals is prohibited.
3. Attention is drawn to the relevant sections to the International Code of Signals, the Merchant Ship Search and Rescue Manual and the following signals:
(a) a piece of orange-colored canvas with either a black square and circle or other appropriate signal (for identification from the air);(b) a dye marker.
