IMSBC Code Amendment Cycle and Editions
How the IMSBC Code is amended: the two-year cycle, tacit acceptance, voluntary application windows, edition numbering, and how to tell which set governs a voyage.
The IMSBC Code is amended on a two-year cycle, with each amendment set carrying a two-digit sequence number and a two-digit year, adopted by a Maritime Safety Committee resolution and brought into force under the tacit acceptance procedure. Each set is normally available for voluntary application for a year before it becomes mandatory.
The full article will set out the full chain of amendment resolutions with their adoption, voluntary application and entry into force dates, and it will explain the two features that trip practitioners up. The two-digit suffix is the drafting cycle year rather than always the year of adoption, so a set can carry a year that does not match its resolution date. And the record is not perfectly biennial: one set slipped and entered into force on a date other than 1 January, after which the following interval compressed to recover the rhythm.
It will also cover the practical questions: which edition governs a voyage that straddles an entry into force date, who may elect early voluntary application and on what terms, and how published editions map to amendment sets.