A berth reservation system applies at most ports which entitles certain classes of ships to a berthage window. Such ships are passenger vessels, foreign naval vessels, tankers and cargo vessels meeting specified requirements, giving advance notice of arrival and paying the stipulated fee. Business Managers will provide full details upon application. Ships without reservations, are subject to the overall efficiency of the port as determined by the Port Manager, and normally berth in order of arrival. In emergency cases, the Business Manager may, in the public interest, grant priority to any type of vessels.