The Harbour Master's Division (DHMR) is responsible for the safe, smooth, clean and secure handling of shipping in the port of Rotterdam. The Harbour Master’s Division is part of the Port of Rotterdam Authority. It oversees safety on the water, by order of the Rotterdam Municipality and the Dutch government. With modern patrol boats and a high-tech traffic control system, the Harbour Master's Division supervises and controls shipping traffic, day and night. As an official emergency service the Harbour Master's Division, together with the other aid agencies, is charged with safeguarding continuity and safety of shipping traffic and the surrounding areas.