5.—(1) A ship falling within paragraph (2) is subject to the following surveys—
(a)before a Maritime Labour Certificate is first issued in relation to the ship, an initial survey by a certifying authority, as set out in Merchant Shipping Notice 1848(M),
(b)within five years of the first issue of a Maritime Labour Certificate, and thereafter at intervals which must be no more than five years, a renewal survey by a certifying authority, as set out in Merchant Shipping Notice 1848(M),
(c)in the period between the anniversary dates of a Maritime Labour Certificate in its second and third years of validity, an intermediate survey by a certifying authority, as set out in Merchant Shipping Notice 1848(M).
(2) A ship falls within this paragraph if it is a ship of 500 gross tonnage or over which—
(a)is engaged in international voyages,
(b)is operating to and from a single port in a country other than the United Kingdom, or
(c)is operating between ports in a country other than the United Kingdom.
(3) A ship which does not fall within paragraph (2) is subject to a survey by a certifying authority as set out in Merchant Shipping Notice 1848(M).
(4) In this regulation, “international voyage” means a voyage from a country to a port outside such a country.