Rule 37. Distress signals

Rule 37. DISTRESS SIGNALS When a vessel is in distress and requires assistance, it must use or display the signals described in Annex IV to these Rules. Annex IV. DISTRESS SIGNALS The following signals, used or displayed either together or separately, indicate that a vessel is in distress and requires assistance: ... (b) a continuous sound by any fog-signaling device; ... (d) a signal transmitted by radiotelephone or by any other signaling system, consisting of the combination of sounds ...- - -... (SOS) in Morse code; ...