27. (1) The Certificate of Registry shall be used only for the lawful navigation of the ship, and it shall not be subject to detention by reason of any title, lien, charge or interest whatever had or claimed by any owner, mortgagee, or other person to, on or in the ship. (2) Every person, whether interested in the ship or not, who has in his possession or under his control the Certificate of Registry of a ship, shall deliver the Certificate on demand to the person entitled to the custody thereof for the purposes of the lawful navigation of the ship, or to any Registrar, Collector of Customs or other person entitled by law to require such delivery. (3) Any person refusing or failing to deliver a Certificate as required by sub section (2), may, by order, be summoned by any Magistrate of the first class to appear before him and to be examined touching such refusal or failure, and, unless it is proved to the satisfaction of such Magistrate that there was reasonable cause for such refusal or failure, such person shall be punishable with fine which may extend to twenty thousand Taka. (4) If the person refusing or failing to deliver the Certificate as required by sub section (2) is proved to have absconded so that the order of such Magistrate cannot be served on him, or if he persists in not delivering the Certificate, the Magistrate shall certify the fact, and the same proceedings may then be taken as in the case of a certificate mislaid, lost or destroyed or as near thereto as circumstances permit. (5) If the master or owner uses or attempts to use for navigation a Certificate of Registry not lawfully granted in respect of a ship, he shall be punishable with fine which may extend to fifty thousand Taka, and the ship shall be liable to be forfeited to the Government.