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How should the Ships Identification Number (SIN) be marked on a Ship?

The marking shall be plainly visible and painted in a contrasting colour in the form of "IMO XXXXXXX". On ships constructed of steel or metal the marking shall be made by: - raised lettering, or - cutting it in, or - centre-punching it, or - any equivalent method of marking which is not easily expunged.
Yacht management
Ensure that your vessel is taken care of from A-Z