General emergency alarm signal
6.—(1) The general emergency alarm signal for summoning passengers and crew to assembly or muster stations and initiating the actions specified in the muster list shall consist of at least seven short blasts followed by one long blast–
(a)on the ship’s whistle or siren; and
(b)in the case of ships of Classes I, II, II(A) and III, and of Classes VII, VII(T), VIII, VIII(T) and IX of at least 45.7 metres in length, on an electrically operated bell or klaxon or other equivalent electrically operated warning system.
(2) The general emergency alarm signal shall be–
(a)capable of operation from the navigation bridge and, except for the ship’s whistle, also from other strategic points; and
(b)audible throughout all the accommodation and normal crew spaces.
(3) Once activated the general emergency alarm signal shall continue to sound until it is manually turned off or is temporarily interrupted by a message on the public address system.