What Is a Seafarer? The MLC Definition — and Why Wind Technicians Fall Through It

What is a seafarer?

A seafarer, under the Maritime Labour Convention 2006 (MLC), is "any person who is employed or engaged or works in any capacity on board a ship to which this Convention applies" — Article II(1)(f). The definition is deliberately broad: it covers not just deck and engine crew but cooks, stewards, and anyone else whose work happens on board, on ships ordinarily engaged in commercial activities.

The label matters because a long list of rights hangs on it. Seafarers are entitled to medical care on board and ashore at no cost to themselves (Regulation 4.1), to 24/7 telemedical advice by radio or satellite free of charge (Standard A4.1), to repatriation if they fall sick or are injured (Regulation 2.5), and they must hold a statutory medical fitness certificate (Regulation 1.2) — the ENG1 in the UK. Roughly 1.89 million seafarers serve the world's merchant fleet, according to the BIMCO/ICS Seafarer Workforce Report.

Offshore wind is building a large workforce right beside that fleet: GWEC and the Global Wind Organisation forecast a need for more than 530,000 trained wind technicians globally by 2028. Many of them travel to work by crew transfer vessel (CTV) or live aboard a service operation vessel (SOV) for two-week rotations. Whether those technicians are seafarers is not a trivia question — it determines which medical safety net, if any, applies to them.

Doubtful cases: the ambiguity is built in

The MLC's drafters knew the definition had grey zones. Article II(3) provides that in the event of doubt, the question "shall be determined by the competent authority in each Member" — in other words, each flag state decides its own borderline cases. Resolution VII, adopted alongside the Convention in 2006, gives the criteria: how long and how often the person is on board, where their principal place of work is, and whether their work is part of the routine business of the ship.

Resolution VII explicitly lists "specialist offshore technicians" among the categories whose status may be doubted, because their work "is not part of the routine business of the ship". But it also warns in the other direction: persons who regularly spend more than short periods aboard "may still be regarded as seafarers" even when their tasks are not maritime, and no category should be excluded automatically. A technician commuting daily by CTV and a technician living aboard an SOV for 14 days sit at different points on that spectrum — and the Convention leaves the call to each flag state.

Where wind technicians stand: the UK position

The clearest published guidance comes from the UK. The Maritime and Coastguard Agency's MGN 471 tightens the ILO wording by adding a decisive limb: a seafarer is a person who works on board a ship "and whose normal place of work is on a ship". A wind technician's normal place of work is the turbine — the vessel is transport and accommodation.

MGN 471's annex spells out the consequences: "Renewables technicians being transported to windfarms to work on a daily basis are not normally considered to be seafarers", and an offshore worker who "only eats and sleeps on the ship may be treated as a passenger — for example windfarm technicians, accommodated on a flotel". Even a technician resident aboard an SOV for a full rotation is, on UK guidance, not a seafarer, because the duration test is paired with the principal-place-of-work test.

MGN 701, issued in December 2025, confirms the same logic for the new Industrial Personnel Code: wind and tidal turbine technicians are industrial personnel, seafarer status remains a case-by-case assessment against the MGN 471 criteria, and the MCA recommends vessels carry a statement confirming which persons on board are not seafarers. Other flag states resolve the question under their own MLC determinations, and few have published guidance as detailed as the UK's — which is precisely why crewing and HSE managers should ask the question vessel by vessel and flag by flag.

Industrial personnel: a third status since July 2024

Until recently, a technician on a CTV or SOV was legally awkward cargo: not crew, and not comfortably a passenger either. The IMO closed that classification gap with a new SOLAS Chapter XV and the International Code of Safety for Ships Carrying Industrial Personnel (IP Code), adopted by resolutions MSC.521(106) and MSC.527(106) in November 2022 and in force since 1 July 2024.

The IP Code defines industrial personnel as persons "transported or accommodated on board for the purpose of offshore industrial activities performed on board other ships and/or offshore facilities" — explicitly including construction, maintenance and operation of renewable energy installations — and states they are not to be treated as passengers. It requires that industrial personnel be at least 16, provide the master with documentary evidence of medical fitness "based on a standard acceptable to the Administration", and complete basic safety and transfer training before boarding.

But the IP Code is a ship-safety code, not a labour convention. It governs how people are carried and transferred — stability, life-saving appliances, transfer arrangements. It does not amend the MLC, and it confers none of the MLC's entitlements: no shipowner liability for medical care, no free telemedical advice, no repatriation rights, no statutory medical certificate regime. Industrial personnel are safer at sea than before July 2024 — but no better covered.

The gap: who owns medical care for a wind technician?

Strip away seafarer status and the maritime medical safety net goes with it. What remains is national occupational health and safety law. In the UK, the Health and Safety at Work etc. Act 1974 was extended to offshore renewable energy structures by the 2013 Application Outside Great Britain Order, and the Health and Safety Executive — not the MCA — enforces it on wind farms. The turbine is a workplace; the employer owes a duty of care; first aid and medical provision follow from the employer's own risk assessment rather than from any statutory maritime standard.

Unlike offshore oil and gas, offshore wind has no dedicated safety-case regime, and no regulation mandates a medic, a telemedical service or evacuation cover for a turbine site. What exists instead is voluntary good practice: the industry body G+ publishes guidance on integrated offshore emergency response and medical fitness for wind turbine workers, developed with the Energy Institute. Notably, RenewableUK's medical fitness guidelines quote the MCA itself cautioning that its seafarer medical standards "should not be used except for the crews of vessels" — employment decisions for wind farm technicians based on ENG1-type standards "will not be valid" and could expose the employer to legal challenge.

The result is a genuinely split regime on a single vessel: the SOV's marine crew are seafarers with MLC rights to free medical care, telemedical advice and repatriation, while the sixty technicians accommodated down the corridor hold none of those rights — their cover is whatever their employer has chosen to arrange.

What HSE and crewing managers should take from this

None of this means wind technicians are uncared for — most operators arrange first aid training, fitness screening and emergency response well beyond the legal minimum. The point is that for technicians, unlike for seafarers, medical cover is a procurement decision, not an entitlement. It exists only if the duty holder has specified it, contracted it and audited it.

Three questions follow for anyone responsible for an offshore wind workforce. First: for each vessel and flag in your operation, has anyone actually determined who counts as a seafarer, and can the vessel evidence it? Second: your technicians have no statutory right to telemedical advice — the flag state TMAS obligation covers the ship, not the site — so who answers when a technician falls ill in the turbine, and under what response time? Third: if a technician must be evacuated or repatriated, which contract pays, and who coordinates the medical side? Operators who can answer all three have closed the gap this article describes; operators who cannot are relying on the assumption that nothing serious will happen far from shore.

Sources

• ILO: Maritime Labour Convention 2006, full text (Art. II, Reg. 1.2, 2.5, 4.1)
• ILO Resolution VII on occupational groups (reproduced in Marshall Islands MN 2-011-33)
• UK MCA MGN 471(M) Amendment 2: MLC definitions, incl. windfarm technicians
• UK MCA MGN 701(M): application of the IP Code and SPS Code
• IMO Resolution MSC.527(106): International Code of Safety for Ships Carrying Industrial Personnel
• Bahamas Maritime Authority MN102: IP Code definitions and application
• UK MCA MGN 482(M) Amendment 2: MLC medical care, incl. 24/7 telemedical advice
• Health and Safety at Work etc. Act 1974 (Application outside Great Britain) Order 2013 (SI 2013/240)
• HSE: Offshore health and safety law and enforcement
• RenewableUK: Medical Fitness to Work — Wind Turbines (incl. MCA caution on seafarer standards)
• G+ Global Offshore Wind Health & Safety Organisation: good practice guidelines
• GWEC / GWO: Global Wind Workforce Outlook 2024–2028
• BIMCO / ICS: Seafarer Workforce Report (1.89 million seafarers)