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23 Jul 2026
What is the difference between BOSIET and BOSIET-CA?
If you work in the offshore industry, you have likely come across both BOSIET and BOSIET-CA as required certifications. The two are closely related, but they are not the same, and choosing the wrong one could mean you are unable to board a helicopter or start work on a platform. This article breaks down exactly what each certification covers, what the difference is, and how to know which one you need.
What is BOSIET and who needs it?
BOSIET stands for Basic Offshore Safety Induction and Emergency Training. It is an OPITO-accredited certification that provides offshore workers with the foundational safety skills needed to survive emergencies at sea. Anyone starting work offshore for the first time is required to hold a valid BOSIET certificate before they can travel to an offshore installation.
The course covers a wide range of emergency scenarios that offshore workers may face, including:
- Helicopter underwater escape training (HUET)
- Sea survival and liferaft procedures
- Firefighting and fire prevention
- First aid and emergency response
- Helicopter safety and helideck awareness
BOSIET is designed for professionals entering the offshore oil, gas, and energy sectors for the first time. This includes engineers, technicians, contractors, and any other personnel who will be traveling to or working on offshore installations. It is a mandatory baseline requirement across most offshore regions worldwide. You can explore our full range of OPITO basic courses to find the right starting point for your offshore career.
What does CA mean in BOSIET-CA?
The CA in BOSIET-CA stands for Compressed Air. More specifically, it refers to the use of a Compressed Air Emergency Breathing System, commonly abbreviated as CA-EBS. This is a small, portable breathing device that provides a short supply of breathable air to help a person escape from a submerged helicopter cabin.
Without a CA-EBS, a person completing a helicopter underwater escape must hold their breath during the escape sequence. With a CA-EBS, they have access to a brief supply of compressed air, which significantly increases the chance of a successful escape, particularly in cold water or when the escape takes longer than expected.
The inclusion of CA-EBS training reflects a higher standard of helicopter safety preparation. It is increasingly required by operators in regions where cold water, deep water, or challenging environmental conditions make helicopter ditching scenarios more dangerous.
What is the difference between BOSIET and BOSIET-CA?
The key difference between BOSIET and BOSIET-CA is the inclusion of Compressed Air Emergency Breathing System training. BOSIET-CA includes all the same content as the standard BOSIET, with the addition of practical training on how to use a CA-EBS device during a helicopter underwater escape exercise.
In practical terms, this means the HUET component of the course is extended to include training on how to correctly use the breathing device before and during an underwater escape. Participants practice the escape sequence while using the CA-EBS, preparing them to use it effectively in a real emergency.
From a certification perspective, the two qualifications carry different OPITO standard numbers. The BOSIET with CA-EBS is a distinct certification, not simply an add-on to the standard BOSIET. If an operator requires BOSIET-CA, holding a standard BOSIET certificate alone will not satisfy that requirement.
Which certification do offshore operators require?
Whether an operator requires BOSIET or BOSIET-CA depends primarily on the region and the type of helicopter operations involved. In the North Sea, including the UK and Norwegian sectors, BOSIET-CA is widely required because of the cold water temperatures and the higher risk profile associated with helicopter travel in that environment.
In warmer water regions or where helicopter operations are less frequent, the standard BOSIET may be sufficient. However, the trend across the global offshore industry is moving toward making CA-EBS training the default standard. Many operators and clients now specify BOSIET-CA in their contractor requirements regardless of location.
Before booking your training, always check the specific requirements of your operator, client, or project. If you are unsure, BOSIET-CA is the safer choice, as it satisfies requirements for both standard BOSIET and CA-EBS-certified roles. If you have questions about which certification applies to your situation, feel free to contact FMTC Safety for guidance.
Can BOSIET be upgraded to BOSIET-CA?
Yes, it is possible to add CA-EBS training to an existing BOSIET certification. OPITO offers a standalone CA-EBS supplementary module that allows holders of a valid BOSIET to complete the additional compressed air training without repeating the full course.
This is a practical and cost-effective option for professionals who originally completed a standard BOSIET and now need to meet BOSIET-CA requirements for a new project or operator. The supplementary training focuses specifically on the CA-EBS device and the modified underwater escape procedure.
It is worth noting that the upgrade option is only available while your BOSIET certificate is still valid. If your certificate has expired, you will need to complete a full BOSIET-CA course or the relevant refresher training rather than a standalone upgrade module.
How long are BOSIET and BOSIET-CA certificates valid?
Both BOSIET and BOSIET-CA certificates are valid for four years from the date of completion. After four years, the certificate expires and must be renewed through a refresher course known as FOET, which stands for Further Offshore Emergency Training.
The FOET refresher also comes in two versions: standard FOET and FOET-CA, mirroring the same CA-EBS distinction as the initial certifications. If you hold a BOSIET-CA, you should complete a FOET-CA to maintain the full scope of your certification.
Keeping track of your expiry date is important. Many operators will not allow personnel offshore if their certificate has expired, even by a single day. Setting a reminder well in advance of your expiry date gives you enough time to schedule your refresher without disrupting your work commitments. You can find all available OPITO HUET, FOET and BOSIET courses to plan ahead.
How FMTC Safety helps you get BOSIET or BOSIET-CA certified
We at FMTC Safety offer both BOSIET and BOSIET-CA training at multiple strategically located training centers, making it straightforward to complete your required certification before heading offshore. Here is what sets us apart:
- Guaranteed course dates — courses run even with a small number of participants, so you never face last-minute cancellations
- Flexible booking — free cancellation or rescheduling up to 24 hours before the course starts
- Experienced instructors — all trainers are qualified, OPITO-certified, and have real offshore industry experience
- Convenient locations — our training centers are located near airports, ports, and major industry hubs across the Netherlands, France, Belgium, the United States, and beyond
- 5-star rated — nearly 3,000 Trustpilot reviews reflect the quality and reliability of our training
Whether you need a first-time BOSIET-CA or want to upgrade your existing BOSIET, we make the process simple and stress-free. View our BOSIET-CA course and book your place today to stay certified, stay compliant, and stay safe offshore.
Frequently Asked Questions
Can I take BOSIET-CA if I have never worked offshore before?
Absolutely. BOSIET-CA is designed for first-time offshore workers and requires no prior offshore experience or prerequisites. It covers all the same foundational safety content as the standard BOSIET, with the CA-EBS training built in, making it the ideal starting point if your operator or region requires it from day one.
What happens if I show up with a standard BOSIET but my operator requires BOSIET-CA?
In most cases, you will not be permitted to travel offshore or board the helicopter until the correct certification is in place. Operators take these requirements seriously, and a standard BOSIET certificate does not satisfy a BOSIET-CA requirement. To avoid costly delays or missed mobilization dates, always confirm the exact certification required before booking your training.
How physically demanding is the BOSIET-CA course, and is there anything I should prepare for?
The course involves practical water-based exercises, including the helicopter underwater escape training (HUET) where you will be submerged and required to escape from an inverted helicopter simulator. A basic level of swimming ability and comfort in water is recommended, though you do not need to be a strong swimmer. Most training providers will ask you to complete a medical self-declaration form beforehand, and it is worth flagging any health conditions such as heart problems, epilepsy, or severe claustrophobia to your training center in advance.
Is BOSIET-CA recognized internationally, or is it only valid in specific regions?
BOSIET-CA is an OPITO-accredited certification, and OPITO qualifications are recognized across the global offshore industry, including the North Sea, Gulf of Mexico, West Africa, Southeast Asia, and the Middle East. However, some regions or specific operators may have additional local requirements on top of BOSIET-CA, so it is always worth checking regional compliance requirements before mobilizing to a new location.
What is the difference between FOET and FOET-CA when it comes to renewing my certification?
FOET (Further Offshore Emergency Training) is the refresher course for standard BOSIET holders, while FOET-CA is the refresher that maintains the full scope of a BOSIET-CA certification, including the compressed air emergency breathing system training. If you hold a BOSIET-CA and renew with a standard FOET, you may lose the CA-EBS endorsement on your record. Always match your refresher to the level of your original certification to avoid gaps in compliance.
How far in advance should I book my BOSIET or BOSIET-CA course before a project start date?
Booking at least four to six weeks in advance is generally recommended, especially during busy mobilization periods when course availability can be limited. If your project start date is fixed, booking even earlier gives you a buffer in case you need to reschedule. Keep in mind that the certificate is issued upon successful completion, so any delays in training directly delay your ability to go offshore.
Does the CA-EBS device used during training get provided by the training center, or do I need to bring my own?
All CA-EBS equipment used during the BOSIET-CA course is provided by the training center as part of the course materials. You do not need to purchase or bring your own device for training purposes. However, once you are working offshore, the CA-EBS device you use on the job will be provided by the helicopter operator or your employer as part of standard offshore safety equipment.
