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Most STCW certificates of competency and many proficiency certificates are valid for five years. To revalidate, you must demonstrate continued competence — usually 12 months of approved sea service in the previous five years, or 3 months in the previous six months — and complete refresher training where required. Plan ahead: revalidation cannot happen retroactively, and a lapsed certificate will keep you off a ship.
STCW Convention, Regulations I/11 (revalidation of certificates) and I/14 (responsibilities of companies). Manila Amendments 2010 introduced explicit refresher requirements for survival craft, fire-fighting, and tanker training. Flag-state competence to revalidate.
Disclaimer. General information only — not legal advice. Rules vary by flag state, port state, vessel type, applicable CBA, and contract. For specific cases, contact ITF, ISWAN, your union, or a maritime lawyer.