30. (1) Whenever a change occurs in the registered ownership of a Bangladesh ship, the change shall be endorsed on her Certificate of Registry either by the Registrar of the ship's port of registry, or by the Registrar of any port at which the ship arrives if he has been advised of the change by the former. (2) For the purpose of a change in the registered ownership of a Bangladesh ship being endorsed under sub section (1) by the Registrar of her port of registry, the master of ship shall deliver the Certificate of Registry to the Registrar, if the change occurs when the ship is at her port of registry, forthwith after the change, and, if it occurs during her absence from that port and the endorsement is not made before her return, upon her first return thereto. (3) The Registrar of any port, not being the port of registry of the ship in respect of which he is required to make an endorsement under sub section (1), may, for that purpose, require the master of the ship to deliver to him her Certificate of Registry, and the master shall deliver the same accordingly. (4) If the master of a ship fails to deliver to the Registrar the Certificate of Registry as required by sub section (2) or sub section (3), he shall be punishable with fine which may extend to fifty thousand Taka.