How to compute check characters for IMO Number
https://tarkistusmerkit.teppovuori.fi/coden.htm
calculation checkdigit IMO | permalink | 2022-06-13 09:21:46

International Maritime Organization (IMO) number
https://en.wikipedia.org/wiki/IMO_number
The International Maritime Organization (IMO) number is a generic term covering two distinct meanings: the IMO ship identification number, a type of hull number used as a unique ship identifier, and the IMO company and registered owner identification number, used to identify uniquely each company and/or registered owner managing ships of at least 100 gross tons (gt).