STCW Certificate Expiry: The Complete Renewal Checklist for 2026

The backbone of your file runs on a five-year cycle. Your Certificate of Competency (COC) must be revalidated every five years, which requires proving continued professional competence — typically 12 months of sea service in the preceding five years, or an approved refresher route if you have been ashore. Start this process at least six months before expiry: flag state processing times vary wildly, and some administrations take months.

The STCW safety refreshers sit on the same cycle: Basic Safety Training (Personal Survival Techniques, Fire Prevention and Fire Fighting, Elementary First Aid, PSSR), Advanced Fire Fighting, Proficiency in Survival Craft and Rescue Boats, and Medical First Aid or Medical Care where held. Since the Manila amendments, these are not lifetime certificates — most administrations require refresher training every five years, and port state inspectors check the dates.

The seafarer medical certificate (ENG 1 or national equivalent) is valid for a maximum of two years — one year for seafarers under 18. This is the certificate most likely to catch you out, precisely because it renews more often than everything else and because companies plan crew changes six to eight weeks ahead: a medical with six weeks left is, from a crewing manager's chair, already a problem.

The professional habit: book your medical when it has three months of validity left, never less. Renewing early costs you nothing — the new certificate runs two years from issue — while renewing late can cost you a contract. If you have any condition under review, allow even more margin, because a restricted or deferred certificate takes time to resolve.

Dangerous cargo endorsements — basic and advanced oil, chemical, and liquefied gas — generally follow the five-year revalidation cycle, with sea service on the relevant tonnage as the standard evidence of continued competence. The trap here is flag state variation: an endorsement issued by one administration and recognised by another can carry different revalidation paperwork on each side.

If you sail on tankers or gas carriers, treat your endorsements with the same seriousness as your COC: same six-month head start, and always confirm the exact requirements with the administration that issued your endorsement, not just the one recognising it. GMDSS certificates for deck officers follow the same five-year revalidation logic and are worth checking at the same time.

A few documents really are long-lived. Security training certificates (Security Awareness and Designated Security Duties) have no STCW-mandated expiry in most administrations. Your seaman's book expires as a document — typically every five to ten years depending on the issuing state — but the sea service recorded inside it never loses validity. Academic qualifications and course completion certificates from training centres do not expire either.

The fine print: 'does not expire' is not the same as 'will always be accepted'. Some companies and flag states impose their own recency requirements on paper that STCW leaves open-ended, and vetting regimes on tankers can be stricter than the convention. When in doubt, the requirement that governs you is the strictest one in the chain: convention, flag state, company, charterer.

Work backwards from every expiry date with three alarms. At six months out: start anything involving a flag state — COC revalidation, endorsement paperwork, seaman's book renewal. At three months out: book refresher courses and your medical; course seats in busy training hubs fill weeks ahead. At one month out: final check that every renewed document has physically arrived and every copy in circulation — with your company, your union, your own files — is the current one.

Then keep one master list: every certificate, its number, its issue and expiry date, and the training centre or administration that issued it. Review it at the start and end of every contract. It takes ten minutes twice a year and eliminates the entire category of 'I thought that was still valid'.

The honest truth about certificate management is that the failure mode is never ignorance — every seafarer knows medicals last two years. The failure mode is a date living in a drawer while life happens: contracts, leave, family, the next ship. Paper does not send reminders.

A digital document vault solves the actual problem: scan every certificate once, record the expiry dates, and get automatic reminders at 90, 30, and 7 days before anything lapses. ShipCrewFinder's Document Vault does exactly this, free, from any phone — including a ship's wifi. Your certificates in one place, your renewals on autopilot, and never again a thirty-second rejection for a two-week gap.