### Merchant Shipping (Registration) (Tonnage) Regulations 《商船(註冊)(噸位)規例》

2A. Certifying Authorities
(1) The Director shall be a Certifying Authority for the purposes of these regulations.
(2) The Director may authorize in writing any person or body to be a Certifying Authority for the purposes of these regulations.
(3) Any person who or body which was immediately prior to the commencement* of this regulation authorized by the Director to be a Certifying Authority under regulation 2 shall on and from such commencement be deemed to be so authorized by the Director under this regulation. 
(74 of 1990 Sch. 5)Editorial Note:
* 3 December 1990

3. Application of Part II
(1) This Part of these regulations and Schedules 2, 3 and 4 hereto shall apply to the following ships registered or to be registered in Hong Kong, being ships of 24 metres in length or over— (74 of 1990 Sch. 5)
(a) new ships;
(b) existing ships to which regulation 13(1) of these regulations would otherwise apply but which undergo alterations or modifications which result in a substantial variation in their existing gross tonnage;
(c) existing ships, if the owner so requests;
(d) all ships with effect from 18 July 1994.
(2) Existing ships the tonnage of which has once been determined under this Part of these regulations pursuant to a request of the owner under paragraph (1)(c) above shall not subsequently have their tonnages determined in accordance with Part IV of these regulations.

4. Method of tonnage measurement
(1) The owner and the master of a ship to be measured shall make it available for measurement by a surveyor and afford all necessary facilities for its survey and measurement and shall produce such plans, drawings, specifications and other documents relating to the ship that the surveyor may require for his use or retention.
(2) The gross and net tonnages shall be determined in accordance with regulations 6 and 7 of these regulations provided that in the case of novel types of craft with constructional features which render the application of the provisions of these regulations unreasonable or impracticable, the gross and net tonnages shall be determined as required by the Director.
(3) All measurements used in the calculations of volumes shall be taken and expressed in metres to the nearest centimetre.
(4) Gross and net tonnages shall be expressed as whole numbers, decimals being rounded off downwards.

### Merchant Shipping (Registration) (Tonnage) Regulations 《商船(註冊)(噸位)規例》

5. Calculation of volumes
(1) All volumes included in the calculation of gross and net tonnages shall be measured, irrespective of the fitting of insulation or the like, to the inner side of the shell or structural boundary plating in ships constructed of metal, and to the outer surface of the shell or to the inner side of the structural boundary surfaces in ships constructed of any other material.
(2) Volumes of appendages shall be included in the total volume.
(3) Volumes of spaces open to the sea shall be excluded from the total volume.
(4) The method and accuracy of the calculations shall be to the satisfaction of the Director and shall be sufficiently detailed to facilitate checking.

6. Gross tonnage
The gross tonnage (GT) of a ship shall be determined by the following formula:
GT

7. Net tonnage
The net tonnage (NT) of a ship shall be determined by the following formula:

NT

8. Miscellaneous tonnages; segregated ballast oil tankers and deck cargoes
(1) Where segregated ballast tanks complying with regulation 13 of Annex 1 of International Convention for the Prevention of Pollution from Ships, 1973 as modified by the Protocol of 1978 relating to that Convention are provided in oil tankers, an entry may be made on the International Tonnage Certificate (1969) indicating the total tonnage of these tanks. The tonnage of such segregated ballast tanks shall be calculated according to the following formula:
K

9. Issue of certificates
The Certifying Authority shall, upon receipt of the appropriate fee, issue to the owner of every ship registered in Hong Kong, the tonnages of which have been ascertained in accordance with regulations 6 and 7 of these regulations, an International Tonnage Certificate (1969) in the form set out in Schedule 4 to these regulations, certifying the tonnages of the ship and containing the following particulars—
(a) the name, port of registry and official number of the ship;
(b) its length, breadth and moulded depth;
(c) its gross and net tonnages;
(d) the date on which the keel was laid or the ship was at a similar stage of construction or date on which the ship underwent alterations or modifications of a major character.

### Merchant Shipping (Registration) (Tonnage) Regulations 《商船(註冊)(噸位)規例》

10. Cancellation of certificates
(1) Where alterations are made in the arrangement, construction, capacity, use of spaces, total number of passengers the ship is permitted to carry under the terms of the ship’s passenger certificate, assigned load line, or permitted draught of the ship such as would cause an increase in the gross or net tonnage, the existing International Tonnage Certificate (1969) shall cease to be valid and shall be delivered up to and cancelled by the Certifying Authority.
(2) When a ship is transferred from the Hong Kong Register the International Tonnage Certificate (1969) shall cease to be valid except when the transfer is to the Administration of a state which is a Contracting Government in which case the certificate may remain in force for a period not exceeding 3 months or until the new Administration issues another International Tonnage Certificate (1969) whichever is the earlier. The Certifying Authority shall transmit to the Administration of that Government as soon as possible after the transfer has taken place a copy of the certificate carried by the ship at the time of transfer and a copy of the relevant tonnage calculations.

11. Change of net tonnage necessitating issue of certificates
(1) When alterations in the values of V

12. Application of Part III
(1) This Part of these regulations shall apply to all ships of less than 24 metres in length, including pleasure vessels and trawlers to be registered in Hong Kong. (74 of 1990 Sch. 5)
(2) Ships, pleasure vessels and trawlers to which this Part of these regulations applies shall have their tonnages ascertained in accordance with the provisions set out in Schedule 5 and Appendices 1 to 5 thereto.

13. Application of Part IV
(1) This Part of these regulations shall apply to existing ships of 24 metres and over registered or to be registered in Hong Kong.
(2) This Part of these regulations shall not apply to existing ships referred to in regulation 3(1)(b) and (c) of these regulations.
(3) Ships to which this Part of these regulations applies shall, until 17 July 1994, have their tonnages ascertained in accordance with the provisions set out in Schedule 5 and Appendices 1 to 4 thereto.

### Merchant Shipping (Registration) (Tonnage) Regulations 《商船(註冊)(噸位)規例》

14. Acceptance of foreign tonnage certificates
(1) An International Tonnage Certificate (1969) issued under the authority of another Contracting Government to a ship not registered in Hong Kong in accordance with the Convention shall be accepted and regarded for all purposes covered by the Convention as having the same validity as one issued under Part II of these regulations. Whilst such a ship is within the waters of Hong Kong it may be subject to inspection by a person duly authorized by the Director in that behalf for the purpose of verifying— (23 of 1998 s. 2)
(a) that the ship is provided with a valid International Tonnage Certificate (1969); and
(b) that the main characteristics of ship correspond to the data given in the certificate.
(2) Any such inspection shall not cause any delay to the ship.
(3) If the inspection reveals that the main characteristics of the ship differ from those entered in the International Tonnage Certificate (1969) so as to lead to an increase in the gross tonnage or the net tonnage, the Administration of the State whose flag the ship is flying shall be informed without delay.