(1) The tonnage of a ship shall consist of gross
tonnage and net tonnage.
(2) The gross tonnage and the net tonnage shall
be determined in accordance with the provisions of these Regulations.
(3) The gross tonnage and the net tonnage of novel
types of craft whose constructional features are such as to render
the application of the provisions of these Regulations unreasonable
or impracticable shall be as determined by the Administration. Where
the tonnage is so determined, the Administration shall communicate
to the Organization details of the method used for that purpose, for
circulation to the Contracting Governments for their information.