Q. What is an IMO ship identification number?
A. A permanent number, required under SOLAS Regulation XI-1/3 to be marked on all passenger ships of 100gt and over, and all cargo ships of 300gt and over, and which remains unchanged on change of flag. It is composed of the letters “IMO” plus a seven-digit number allocated by HIS Maritime to every seagoing merchant ship of 100gt and over at the time of build. Details are in IMO Circular letters No.1886/Rev.3 and No.1886/Rev.5.
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