S.L. 234.21 Art. 5Use of signals of distress. 1. The indicate (a) a (b) a (c) (d) a (e) a (f) (g) a (h) (i) a (j) a (k) (l) (m) (n) (o) 2. The of indicating be confused 3. Signals, the (a) a or (b) a

(1) No signal of distress shall be used by any ship unless the master of the ship so orders.

(2) The master of the ship shall not order any signal of distress to be used by his ship unless he is satisfied:

(a) that his ship is in serious and imminent danger, or that another ship or an aircraft is in serious and imminent danger and cannot of itself send that signal; and

(b) that the ship in danger (whether his own ship or another ship) or the aircraft in danger, as the case may be, requires immediate assistance in addition to any assistance then available to her.

(3) The master of a ship which has sent out any signal of distress by means of radio shall cause that signal to be revoked as soon as he is satisfied that the ship or aircraft to which the signal relates is no longer in need of assistance as aforesaid. SCHEDULE

(Rule 4) ANNEX IV OF THE INTERNATIONAL REGULATIONS FOR PREVENTING COLLISIONS AT SEA, 1972 DISTRESS SIGNALS

following signals, used or exhibited either together or separately, distress and need of assistance:

gun or other explosive signal fired at intervals of about a minute; continuous sounding with any fog-signalling apparatus; rockets or shells, throwing red stars fired one at a time at short intervals; signal made by radiotelegraphy or by any other signalling method consisting of the group ...-... (SOS) in the Morse Code; signal sent by radiotelephony consisting of the spoken word "Mayday"; the International Code Signal of distress indicated by N.C.; signal consisting of a square flag having above or below it a ball or anything resembling a ball; flames on the vessel (as from a burning tar barrel, oil barrel, etc.); rocket parachute flare or a hand-flare showing a red light; smoke signal giving off orange-coloured smoke; slowly and repeatedly raising and lowering arms outstretched to each side; the radiotelegraph alarm signal; the radiotelephone alarm signal; signals transmitted by emergency position-indicating radio beacons; approved signals transmitted by radiocommunication systems, including survival craft radar transponders. use or exhibition of any of the foregoing signals except for the purpose distress and need of assistance and the use of other signals which may with any of the above signals is prohibited. Attention is drawn to the relevant sections of the International Code of Merchant Ship Search and Rescue Manual and the following signals: piece of orange-coloured canvas with either a black-square and circle other appropriate symbol (for identification from the air); dye marker.