STCW Certificate Requirements by Rank: What You Actually Need, and When (2026)

Basic Safety Training — fire prevention and firefighting, elementary first aid, personal survival techniques, and personal safety and social responsibility — is the baseline every seafarer holds before their first contract, regardless of rank or department. Beyond that shared foundation, requirements diverge quickly by both rank and department.

Security-related certification — Security Awareness for all seafarers, and Designated Security Duties for those assigned specific security responsibilities — applies across ranks too, but is one of the certificates most often found expired during document checks, precisely because it is easy to treat as a one-time formality rather than something with its own renewal cycle.

A deck Officer of the Watch requires the Certificate of Competency itself, plus Radar Observer and ARPA certification, GMDSS operator certification appropriate to the vessel's equipment, and — depending on vessel type — tanker-specific familiarization or advanced training. An engine Officer of the Watch requires the equivalent Certificate of Competency plus, on most modern tonnage, Engine Room Simulator training and, where applicable, high-voltage certification.

The confusion that shows up most often at this level is tanker endorsements: a deck or engine officer moving from dry cargo to their first tanker contract needs specific Tanker Familiarization at minimum, and Advanced Tanker training depending on the specific tanker type and role — a gap that a CV can make invisible until a crewing department actually checks the certificate list against the vessel type being crewed for.

Moving from Second Officer or Second Engineer to Chief Mate or Chief Engineer is where several certificates shift from optional or company-preferred to genuinely mandatory. Chief Mate requires Ship Handling and Manoeuvring at the management level in most administrations, alongside the underlying sea time and Certificate of Competency examination. Chief Engineer requires Engine Room Resource Management and, on relevant vessel types, high-voltage and advanced technical certification well beyond what Second Engineer required.

This is also the rank transition where medical certificate and general fitness requirements are checked most rigorously by crewing departments, simply because the responsibility profile of the rank has changed enough that companies apply closer scrutiny than they do at junior officer level.

At Master and Chief Engineer level, the certificate requirements themselves are largely an extension of what Chief Mate and Chief Engineer already require, but two things change: Bridge Resource Management (Master) and Engine Room Resource Management (Chief Engineer) become non-negotiable at the management level rather than partially satisfied by operational-level training, and administrations scrutinise the full certificate set — not just the headline Certificate of Competency — far more closely during flag state endorsement.

A Master's or Chief Engineer's certificate set with even a minor supporting certificate expired is a materially bigger problem than the same gap at junior officer level, because flag state endorsement for command rank typically requires the complete, current set — not just the primary Certificate of Competency — to be verified before sign-on.

Most STCW certificates carry a five-year validity period, but not all of them renew on the same clock, and a seafarer who tracks only their primary Certificate of Competency's expiry date frequently discovers a supporting certificate — Basic Safety Training refresher, GMDSS, security certification — has lapsed separately, sometimes mid-contract.

The practical fix experienced officers use is treating every certificate as having its own independent expiry to track, not assuming they all renew together, and building in enough lead time before an expected sign-on that a lapsed certificate can be refreshed before it becomes a crewing department's problem to solve on short notice.

Because the exact set genuinely differs by rank, department and vessel type, the safest approach is checking the specific, current requirement for your exact rank rather than relying on what a previous rank required or what a colleague on a different vessel type holds.

The free Certificate Requirements by Rank tool in ShipCrewFinder's Crew Toolkit is organised by rank for exactly this — the certificate set for your specific rank, in one place, rather than reconstructed from memory or a general STCW summary that doesn't account for rank-specific differences.