(1) For the purposes of this Part, a ship's tonnage shall be its gross tonnage.
(2) The measurement of such tonnage in the case of a foreign ship shall be according to section 32.
(3) In the case of any foreign ship which is incapable of being measured under the provisions of this Act, the Minister shall, on receiving evidence from or at the direction of the court hearing a case in which the tonnage of the ship is in question, concerning the dimensions of the ship as it is found practicable to furnish, give a certificate under his or her hand stating what would in his or her opinion have been the tonnage of that ship if it had been duly measured according to the provisions of this Act and the tonnage so stated in such certificate shall for the purposes of this Part be deemed to be the tonnage of the ship.