4. (1) The Government may, for efficient administration of this Ordinance, establish a Department of Shipping which shall be headed by a Director General of Shipping. (2) Save as otherwise expressly provided in this Ordinance, the Principal Officers, the Deputy Principal Officers, Surveyors and other Officers appointed to perform any functions under this Ordinance, not being functions of judicial nature, shall, in the performance of their functions, be subject to the general supervision, direction and control of the Director General of Shipping. (3) The Government may, by notification in the official Gazette, direct that the powers exercisable by it under any of the provisions of this Ordinance specified in the notification shall, subject to such conditions, if any, as may be so specified, be exercisable also by the Director General of Shipping. (4) The Director General of Shipping may, by general or special order, direct that any of the powers and functions which he is empowered or authorised to exercise and perform under this Ordinance shall, subject to such conditions, if any, as he may deem fit to impose, be exercised and performed also by such officer or authority as may be specified in the order: Provided that no such order shall be made without the previous approval of the Government if it relates to any of the powers of the Government which the Director General of Shipping has been authorised to exercise under sub-section (3).