11.—(1) All certificates of competency issued by the Authority shall be in accordance with the Radio Regulations and the provisions of the STCW Convention and must be valid so long as the Constitution and Convention of the International Telecommunication Union and the STCW Convention remain in force.
(2) All certificates of competency shall be endorsed by the Authority as required under Article VI of the STCW Convention and contain the information set out in paragraphs 1 and 2 of section A-I/2 of the STCW Code.
(3) Notwithstanding anything in the Radio Regulations, a holder of a certificate of competency who is serving at sea, or intends to return to sea after a period ashore shall, in order to continue to qualify for sea service as a radio operator, have his certificate of competency revalidated by the Authority at intervals not exceeding 5 years from the date of issue or re-validation, as the case may be.
(4) An application for revalidation under paragraph (3) shall be accompanied by the fee specified in the Second Schedule.
(5) The Authority shall refuse to revalidate a certificate of competency under paragraph (3) if the holder of the certificate does not show that he has satisfied the requirements of the STCW Convention with regard to medical fitness and continued professional competence.