BOSIET vs GWO Sea Survival: Which Training Applies to Offshore Wind?

What is BOSIET, what is GWO Sea Survival — and which applies to offshore wind?

BOSIET — Basic Offshore Safety Induction and Emergency Training — is the OPITO-standardised safety induction for the offshore oil and gas industry. It is aimed, in OPITO's own words, at personnel "new (or returning) to the offshore oil and gas industry" who travel to installations by helicopter, and it bundles helicopter escape, sea survival, first aid and firefighting into roughly three days of training, valid for four years. GWO Sea Survival is something different: one module of the Global Wind Organisation's Basic Safety Training (BST), the safety standard developed by and for the wind industry, built around vessel transfer to turbines and valid for 24 months.

For offshore wind, GWO Basic Safety Training — including the Sea Survival module for offshore work — is a widely specified industry standard, but it is not a universal statutory licence to work offshore. The employer, site operator and applicable national or flag-state rules determine the binding training matrix. BOSIET does not automatically substitute for a GWO Sea Survival record, nor is it made redundant by one: a workforce that also flies offshore by helicopter, or moves between oil and gas and wind, may need OPITO training as well.

The rest of this article sets out what each standard actually contains, how the two compare on validity and content, what wind employers require in practice, and where the medical fitness requirements behind both regimes differ. It is written for HSE and crewing managers deciding what to book — not to sell either course.

What does BOSIET cover?

BOSIET is a training standard owned by OPITO, the offshore energy skills body, and delivered worldwide through OPITO-approved centres. It exists in two main variants defined by the emergency breathing system used during helicopter travel: BOSIET with EBS (rebreather system, OPITO course code 5700) and BOSIET with CA-EBS (compressed air system, code 5750). Tropical variants — TBOSIET and TFOET — exist for warm-water regions, and OPITO also publishes a Tropical HUET standard.

The standard comprises four mandatory units: a safety induction covering offshore hazards and regulations (delivered entirely as theory), helicopter safety and escape — the HUET element, practised with the emergency breathing system — sea survival and first aid, and firefighting with self-rescue. Total contact time is 21 hours for the EBS version and 20 hours 40 minutes for the CA-EBS version, with roughly 40% theory and 60% practical outside the induction unit; training providers typically deliver it over three days.

Validity works on a four-year cycle: OPITO sets a maximum four-year interval between completing BOSIET and completing the FOET refresher (Further Offshore Emergency Training, code 5858 for the EBS variant). FOET is a single day — eight hours including introduction — covering three units: helicopter emergency procedures, firefighting and first aid. FOET should normally be completed within the permitted interval. A learner outside the applicable entry window will normally need the initial course again unless an expressly approved OPITO, duty-holder or asset-owner process applies; do not assume that an expired certificate remains acceptable.

What does GWO Basic Safety Training cover — and where does Sea Survival fit?

The Global Wind Organisation is "a non-profit industry association representing leading wind turbine manufacturers, renewable energy operators and independent service providers". Its Basic Safety Training standard covers five subjects — First Aid, Manual Handling, Fire Awareness, Working at Heights and Sea Survival — and states plainly: "To enable participants to work in the offshore environment, an additional GWO Sea Survival Module training shall be completed." Onshore technicians can stop at four subjects; offshore technicians cannot.

The Sea Survival module aims to give participants "the ability to act safely and responsibly and to take the correct preventive actions in all aspects of offshore operations from shore to installation vessel (or WTG) and vice versa". Its contact time is 7 hours 25 minutes under BST V20, effective 10 March 2026, which added a walk-to-work lesson on motion-compensated gangways. During the transition, V19 and its separate refresher standard remain valid until 10 September 2026. The module covers cold-water immersion, lifesaving appliances and PPE, search and rescue and GMDSS, man-overboard procedures, transfer hazards and practical transfer between a crew transfer vessel and a wind turbine transition piece. Wet practical exercises include controlled water entry, swimming techniques and life raft use.

Every BST module, Sea Survival included, is valid for 24 months. Training providers upload records to WINDA, where employers can verify current training status; GWO clarifies that a WINDA entry is a digital representation of the provider's original record rather than itself the original certificate. A record can be renewed up to two months before expiry while retaining the original certification date. Renewal is via the relevant refresher training — incorporated into BST V20 rather than remaining in a separate standard after the transition period. If the record expires, the normal route is the applicable initial module, unless an approved GWO REcognition or other expressly permitted pathway applies.

BOSIET vs GWO Sea Survival: how do they compare?

The two standards are not rival versions of the same course. BOSIET is a full offshore induction built around a helicopter ditching scenario; GWO Sea Survival is a focused module built around vessel transfer and immersion, sitting inside a broader wind-specific training package that separately covers first aid, fire, manual handling and working at height. The comparison below shows where they genuinely differ.

Which one do offshore wind employers actually require?

GWO training is widely used across the wind industry. Its standards are agreed by member companies, including turbine manufacturers and operators, and are commonly written into project and contractor training matrices. That commercial acceptance should not be described as a universal legal boarding requirement: the employer and operator must identify the applicable standard for the role, site, transfer method and jurisdiction.

There is no automatic BOSIET-to-GWO or GWO-to-OPITO equivalence in either core standard. An experienced oil-and-gas worker should therefore not assume that an in-date BOSIET satisfies a wind site's GWO requirement, and a wind technician should not assume a GWO record satisfies an OPITO requirement. There is, however, a qualified exception to saying that full retraining is always the only route: GWO's REcognition programme allows an approved provider to gap-analyse relevant accredited legacy training against GWO modules. Following GWO approval, the provider may deliver gap training and/or upload a recognised WINDA record. That is a formal cohort- and scheme-based process, not an automatic exemption for any individual BOSIET holder.

OPITO itself has acknowledged the overlap rather than disputed it. It has launched a suite of renewable-energy products — including a BOSIET for Renewable Energy (Wind) with "full access" and "limited access" tiers matched to whether personnel go beyond the transition piece into tower and nacelle, and a transition standard for oil-and-gas workers entering wind, which its CEO described as "enabling workers to move across the energy sector with greater ease". OPITO's wind BOSIET carries four-year validity, and these products are a separate pathway from GWO's — which standard governs a given site remains the operator's contractual choice, so check the site's training matrix before booking anything.

When does a wind workforce need HUET or BOSIET as well?

The GWO Sea Survival module centres on vessel and offshore-installation transfer and contains no helicopter underwater escape training. OPITO says helicopter transfer is increasingly relevant to deep-water renewable projects, but that industry statement should not be read as a measure of how common helicopter use is across offshore wind globally. Where helicopter transfer forms part of a role, mobilisation plan or foreseeable operating model, the operator may specify helicopter escape training in addition to GWO BST. OPITO now permits standalone HUET delivery in EBS, CA-EBS and tropical variants, allowing workers who do not need the full BOSIET to take training matched to the helicopter system and environment.

The second common trigger is a mixed portfolio. Contractors whose technicians rotate between oil-and-gas installations and wind farms — vessel crews, inspection teams, commissioning specialists — end up maintaining both card sets in parallel: a four-year OPITO cycle and a 24-month GWO cycle, with different refresher bookings, different record systems and different medical gates. That is an administrative burden worth planning deliberately rather than discovering at mobilisation, because the shorter GWO cycle is the one that lapses first.

The medical fitness question behind both standards

Both regimes gate physically demanding training — including pool exercises, smoke and climbing — behind a fitness check, but they do it differently. OPITO requires BOSIET and FOET participants to hold a valid offshore medical certificate or an accepted equivalent (an employer-approved medical, a certificate of fitness to work at sea, or a diving medical), or to complete a medical screening form issued by the training centre. That form is a screening and declaration process, not the equivalent of a medical examination. GWO likewise does not mandate an examination: its Requirements for Training require participants to be medically fit, well-rested and capable of participating, supported by its medical assessment process. Participants should disclose conditions that could be affected by immersion, underwater escape, smoke, height, stress or physical exertion. If doubt arises, training should pause while advice is obtained from an appropriately qualified medical professional familiar with the exercises.

For an HSE or crewing manager the practical point is that a GWO card is not evidence of a medical examination, and an offshore training medical is not the same as an offshore work medical. What screening a technician needs to work offshore — as opposed to train — is set by the employer, the site operator and, where applicable, flag-state or national rules, and those regimes do not align neatly across oil and gas, wind and maritime crews. Mapping which of your people are covered by which medical standard, and who reviews the borderline cases, is worth the same deliberate attention as the training matrix itself — ideally with clinical input from whoever provides your offshore medical cover, before certificates and mobilisation dates start colliding.

Sources

• OPITO: BOSIET with Emergency Breathing System (EBS), standard 5700
• OPITO: BOSIET with Compressed Air Emergency Breathing System (CA-EBS), standard 5750
• OPITO: FOET with Emergency Breathing System (EBS), standard 5858
• GWO: Basic Safety Training Standard — current version (V20, effective 10 March 2026)
• GWO: March 2026 standards update and V19 transition period
• GWO: REcognition process for approved gap analysis and legacy training
• GWO: Basic Safety Training Standard V18 PDF (quoted provisions on offshore requirement, validity and renewal, unchanged in V20)
• GWO: Requirements for Training (medical fitness and self-assessment provisions; V14 PDF, carried forward in V15)
• Global Wind Organisation: about GWO and trained workforce figures
• GWO: training standards for wind (agreed by member companies, recommended for technicians)
• OPITO: renewable-energy training product suite, including full- and limited-access wind BOSIET
• OPITO news: standalone HUET standards and helicopter transfer in offshore renewables
• WINDA: terms explaining that database entries represent providers' original training records
• FMTC Safety: OPITO BOSIET with EBS (5700) — example of three-day delivery