STCW Certificates Explained: What Every Seafarer Needs

STCW stands for the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers. It is the global standard, agreed through the International Maritime Organization, that sets the minimum training and competence required to work on board commercial vessels.

In practice, STCW is why a seafarer certified in one country can work on a ship flagged in another. It creates a common baseline of safety and competence that employers and flag states worldwide recognise and trust.

Before you can work on most commercial vessels, you need STCW Basic Training (often called Basic Safety Training). It covers personal survival techniques, fire prevention and firefighting, elementary first aid, and personal safety and social responsibility.

This is the non-negotiable entry ticket. Whether you are aiming to be a deck rating or a future Chief Engineer, you start here. Many of these certificates also require refresher training at set intervals, so keeping them current is part of staying employable.

Beyond basic training, officers hold a Certificate of Competency (CoC) for their rank — for example, a deck officer's or marine engineer's licence. The CoC proves you are qualified to hold a specific rank and is tied to your level of training, sea time, and examinations.

Your CoC is one of the most important documents on your CV. Crewing managers check it first to confirm you are genuinely qualified for the role, which is why listing it accurately, with validity dates, matters so much. Our guide on writing a maritime CV explains how to present certificates so they build trust rather than raise questions.

Certain vessel types require additional STCW endorsements on top of basic training and your CoC. Tanker endorsements for oil, chemical, and gas carriers are the classic examples, and they are valuable precisely because fewer seafarers hold them.

These specialised certificates are a direct route to higher pay. As we covered in our rank-by-rank look at seafarer salaries, crew with scarce endorsements for gas and chemical tankers command some of the strongest wages in the industry, because demand far outstrips the supply of qualified people.

Expired certificates are one of the fastest ways to lose a contract. Many STCW certificates have validity periods and require refresher courses, so track your expiry dates and renew well before they lapse — not the week a vessel needs you.

Increasingly, employers also want to verify that certificates are genuine before they commit. Keeping a complete, verified profile means a company can confirm your qualifications quickly and contact you ahead of candidates whose documents take longer to check.