Where a certificate, issued in pursuance of section 51 and for the time being in force, is produced in respect of the ship to which the certificate relates-
(a) the ship shall be deemed to have been surveyed in accordance with the load line regulations; and
(b) if lines are marked on the ship corresponding in number and description to the deck-line and load lines as required by the load line regulations, and the positions of those lines so marked correspond to the positions of the deck-line and load lines as specified in the certificate, the ship shall be deemed to be marked as required by those regulations.