2. Each State shall issue to ships to which it has granted the right to fly its flag documents to that effect.
Article 6
1. Ships shall sail under the flag of one State only and, save in exceptional cases expressly provided for in international treaties or in these articles, shall be subject to its exclusive jurisdiction on the high seas. A ship may not change its flag during a voyage or while in a port of call, save in the case of a real transfer of ownership or change of registry.
2. A ship which sails under the flags of two or more States, using them according to convenience, may not claim any of the nationalities in question with respect to any other State, and may be assimilated to a ship without nationality.
Article 7
The provisions of the preceding articles do not prejudice the question of ships employed on the official service of an inter-governmental organization flying the flag of the organization.
Article 8
1. Warships on the high seas have complete immunity from the jurisdiction of any State other than the flag State.
2. For the purposes of these articles, the term "warship" means a ship belonging to the naval forces of a State and bearing the external marks distinguishing warships of its nationality, under the command of an officer duly commissioned by the government and whose name appears in the Navy List, and manned by a crew who are under regular naval discipline.
Article 9
Ships owned or operated by a State and used only on government noncommercial service shall, on the high seas, have complete immunity from the jurisdiction of any State other than the flag State.
Article 10
1. Every State shall take such measures for ships under its flag as are necessary to ensure safety at sea with regard inter alia to:
(a) The use of signals, the maintenance of communications and the prevention of collisions;
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