A yacht is only as compliant as the tickets in its crew’s pockets. STCW certificates and the ENG1 medical are the baseline that lets someone work at sea at all — and, like the vessel’s own documents, they expire on fixed dates and are checked at port state control. Tracking them is not admin for its own sake; it is what keeps the crew legally able to sail.
This guide covers what STCW requires, the ENG1 medical, and how the validity cycle works.
1. What STCW is
STCW — the Standards of Training, Certification and Watchkeeping convention — sets the minimum training and certification for seafarers worldwide, yacht crew included. It is what turns “experienced” into “certified”: the internationally recognised proof that a crew member has the safety training and competency their role requires.
2. STCW basic safety training
The entry point for almost anyone working on a yacht is STCW Basic Safety Training — a set of short courses, such as those run by our partner Riviera Crew Academy in Antibes, covering personal survival techniques, fire prevention and fire fighting, elementary first aid, and personal safety and social responsibilities (plus security awareness). No crew member should be working commercially at sea without it.
3. Certificates of Competency by role
Above the basic level, roles require Certificates of Competency (CoC) scaled to responsibility and vessel tonnage — deck officers and masters, and marine engineers, hold tickets appropriate to the size of yacht they run. The larger the vessel, the higher the certification the senior crew must hold.
4. The ENG1 seafarer medical
The ENG1 is the UK seafarer medical fitness certificate (with flag-state equivalents accepted elsewhere). It confirms a crew member is medically fit for sea service, and it is a hard requirement: an expired medical means the crew member cannot legally work, however good their other certificates. It is typically valid for up to two years.
5. Flag endorsements and CeC
A certificate often needs a flag-state endorsement (a Certificate of Equivalent Competency, or CeC) to be valid on a yacht of a particular registry. This is a common tripwire: a crew member holds a valid CoC but lacks the endorsement for the vessel’s flag. Both the underlying certificate and its endorsements have to be tracked.
6. Validity and revalidation
STCW certificates generally run on a five-year revalidation cycle, requiring evidence of continued competency and up-to-date training; the ENG1 medical runs on its own shorter cycle. Because different certificates expire on different clocks, the practical challenge is simply never losing track of the next date across a whole crew.
7. Why an expired certificate grounds the crew member
An expired STCW element or medical is not a paperwork nuisance — it is a compliance failure that can stop that person working and expose the vessel at inspection. A single lapsed medical mid-season can leave a watch short-handed. This is the same discipline the vessel applies to its own certificates and flag-state documents: track the expiry, act before the date.
8. Tracking crew certificates
The reliable fix is one place that holds every crew member’s certificates with their expiry dates, and alerts before anything lapses. In Scyllastar’s crew management platform, STCW certificates, ENG1 medicals, seaman’s books and endorsements are stored per crew member and monitored automatically — so a certificate expiring mid-season is a reminder handled weeks in advance, not a failure discovered at the gangway.
Frequently asked questions
What is STCW certification for yacht crew?
STCW (Standards of Training, Certification and Watchkeeping) is the international minimum training standard for seafarers, yacht crew included. The entry point is STCW Basic Safety Training; senior roles hold Certificates of Competency scaled to their responsibility and the vessel’s tonnage.
What is an ENG1 and how long is it valid?
The ENG1 is the UK seafarer medical fitness certificate, with flag-state equivalents accepted elsewhere, confirming a crew member is fit for sea service. It is typically valid for up to two years, and an expired medical means the crew member cannot legally work.
How often must STCW certificates be revalidated?
STCW certificates generally run on a five-year revalidation cycle requiring evidence of continued competency and up-to-date training. Because different certificates and the ENG1 expire on different clocks, tracking each expiry date is essential.