5. (1) The Government shall establish and maintain the Principal Mercantile Marine Office at the port of Chittagong and may establish and maintain a branch office of that office at any other port in Bangladesh as it may consider necessary for carrying out the purposes of this Ordinance. (2) The Principal Mercantile Marine Office at the port of Chittagong shall be in the charge of a Principal Officer appointed by the Government and a branch office of that office at any other port shall be in the charge of a Deputy Principal Officer; and the Deputy Principal Officer may perform the functions of a Principal Officer under this Ordinance. (3) A Principal Officer appointed under sub section (2) or an officer performing the functions of a Principal Officer may, without prejudice to his functions as such, perform all or any of the functions of a Surveyor under this Ordinance.