7.—(1) Every ship shall have a public address system consisting of a loudspeaker installation enabling the broadcast of messages into all spaces where crew members or passengers, or both, are normally present and to all assembly or muster stations (as appropriate).
(2) The public address system shall–
(a)provide for the broadcast of messages from the navigation bridge and other strategic points;
(b)be installed with regard to acoustically marginal conditions;
(c)not require any action by the addressee in order to be audible; and
(d)be protected against any unauthorised use.