Definition
The IMO ship identification number is made of the three letters "IMO" followed by the seven-digit number assigned to all ships by IHS Fairplay (formerly known as Lloyd's Register-Fairplay) when constructed. This is a unique seven digit number that is assigned to propelled, all passenger ships of 100 GT and above and cargo ships of 300 gross tonnage and above, upon keel laying with the exception of the following:
The integrity of an IMO number can be verified by its check digit, which is the rightmost digit. This is done by multiplying each of the leftmost six digits by a factor corresponding to their position from right to left, and adding those products together. The rightmost digit of this sum is the check digit. For example, for IMO 7654329: 7×7 + 6×6 + 5×5 + 4×4 + 3×3 + 2×2 = 139.
Read more about this topic: IMO Ship Identification Number
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—Richard Eberhart (b. 1904)
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