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Is a ship’s IMO Ship Identification Number the same as its Official Number?

No. The Official Number is allocated by the registry authority of the flag State (e. g. the RSS in the case of a UK ship) for the period of registration. The IMO number, however, is retained throughout the ship’s life.

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What other identification number scheme has been mandated by IMO resolution?

What are the IMO requirements regarding marking of documents with the ship’s IMO Ship Identification Number?