The central organisation lies with the Naval Department of the Ministry of Defence. The chief command is exercised by the Com- mander-in-Chief, who has at his service the Naval Staff. These authorities have their headquarters at Oslo. The coast is divided into three Sea-Defence districts with stations at Horten, Bergen, and Ramsund. The chief of a sea-defence district has under his command the local naval-defence forces, coast fortresses, and naval stations, also the coast- guard service (intelligence service). The Naval Air Arm is technically and in respect of training organised as an auxiliary force with its own chief. For the Submarine Service there is a separate inspectorate. The Coastal Artillery is organised as a separate unit with its own chief. Under the Ministry of Defence the administra- tion is effected by six technical departments with their headquarters at Horten: Main Naval Dock- yard, Department of Naval Ordnance, Department of Torpedoes and Mines, Department of Naviga- tion, Medical Department, and the Victualling and Accountant Department. The civil institutions, the Hydrographic Office and the Pilotage, are under the control of the Ministry. 41