A 'flag of convenience' regards the registration of a ship in a state different from that of the ship's owners.

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Vessels registered under flags of convenience can often cut operating costs or avoid the regulations of the owner's country. To achieve that, a ship owner will find a country with an open registry, or a nation that allows registration of vessels owned by foreign entities.

A ship operates under the laws of its flag state, so vessel owners often register in other flags, aiming to leverage reduced regulation, less administrative fees, and more friendly ports.

However, many nations with open registries are facing criticism for having substandard regulations. It is a fact that many shipowners are allowed to remain legally anonymous in open registry systems, thus making it difficult to identify and prosecute legal actions.

What is more, some ships with flags of convenience have been found to participate in criminal activity, providing substandard working conditions, pollution incidents or illegal fishing. Therefore, vessels carrying these flags could be targeted by other nations for special enforcement when they call in one of the host nation's ports.