A surveyor of ships may board any ship for the purpose of verifying whether

(a) there is in force, in respect of a foreign Safety Convention ship, a valid Safety Convention Certificate;

(b) the condition of the hull, equipment and machinery of any Safety Convention ship corresponds substantially with the particulars shown in the certificate;

(c) the number, grades and qualifications of radio officers or operators on board correspond with those shown in that certificate, except where the certificate states that the ship is partially exempt from the provisions of the Safety Convention relating to INMASART; and

  (d) any conditions subject to which an exemption certificate is issued, are being complied with.