The Merchant Shipping (Emergency Information for Passengers) Regulations 1990
These Regulations require all United Kingdom passenger ships certified to carry more than 20 passengers which are not required by the Merchant Shipping (Fire Protection) Regulations 1984 to be provided witha public address system, to be provided withsuch a system. Smaller ships of certain Classes may be provided witha portable loud hailer in lieu of such a system. The Regulations also require the attention of passengers on Class I passenger ships to be drawn to the passenger emergency instructions, when a muster is not held on departure, and require passengers on ships of Classes IV, V, VI and VI(A) to be given safety information at the commencement of each voyage.