Every seafarer needs a valid medical certificate before joining a ship, and the examination behind it is the first hurdle between a job offer and a joining date. Cadets and early-career seafarers often treat it as a formality. It is a real clinical examination with defined standards, and a problem found there can delay or end a placement. Knowing what the doctor checks, and when, lets you address issues before they cost you a contract.
This article covers the pre-employment fitness check: why it exists, the ENG1 medical requirements, how other national certificates compare, and what to do if the result isn’t a straightforward pass. For the bigger picture of how medical fitness fits alongside the rest of your qualifications, see the guide to STCW certification and what every seafarer needs. For what happens if you fall ill while on board, see the article on accessing medical care at sea.
Why every seafarer needs a medical certificate before joining a ship
A ship is a workplace where help is far away. If a crew member collapses, loses consciousness or cannot see a hazard, the nearest hospital may be days from the vessel, and the rest of the crew must cover the work. The medical certificate exists to reduce the chance of that happening and to ensure no one is put in a role their health cannot safely support.
Two international instruments set the requirement:
- The Maritime Labor Convention (MLC), 2006. Regulation 1.2 and Standard A1.2 state that seafarers must not work on a ship unless they hold a valid medical certificate confirming they are medically fit for their duties.
- The STCW Convention and Code. Section A-I/9 sets standards for the medical fitness of seafarers holding certificates of competency and requires a qualified practitioner to apply those standards.
Under these rules, flag states set the detailed medical standards and decide which doctors may issue certificates. That is why no single global certificate exists. Each flag state implements the same principles through its own rules, so the standards and forms are similar in spirit but differ in detail.
The certificate also protects you. A condition caught at a shore examination, such as raised blood pressure, an unreported heart rhythm problem, or a vision defect, is far easier to manage on land than in the middle of an ocean passage. Many seafarers first learn of a treatable condition at this appointment.
ENG1 and its equivalents: which certificate your flag state and employer will accept
The ENG1 is the seafarer medical certificate issued under UK rules, administered by the Maritime and Coastguard Agency (MCA). Only an MCA-approved doctor can issue it. You cannot get it from your regular GP unless they’re on the approved list; approved doctors are listed on the UK government website. The ENG1 is required for work on UK-flagged vessels, and many employers, cadetships, and training providers require it even for people who will not be working on UK ships, because it is widely recognized.
Other certificates you may meet include:
- Flag state certificates. Many flag states issue their own medical certificate or recognize a specific list of foreign certificates. Some accept the ENG1, others require an examination by an approved doctor, and some require their own form.
- National pre-employment medical examinations. Some labor-supplying countries run their own systems. In the Philippines, for example, seafarers undergo a pre-employment medical examination (PEME) at an accredited clinic, which crewing agencies and employers commonly require in addition to the flag state certificate.
- Employer or company medicals. Some shipping companies and cruise lines require an examination at their own nominated clinic, and sometimes with extra tests, even if you already hold a valid certificate.
What you need depends on two things: the flag of the ship you will join and your employer’s requirements. These do not always match. A ship may be registered in one country, managed from another and crewed through an agency in a third, and each party may have its own expectations.
The practical step is to ask your employer, crewing manager or training provider, in writing, exactly which certificate they will accept and from which doctors or clinics, before you book anything. A certificate from the wrong source costs you the appointment fee, and time you may not have. If you are a cadet, your training provider or sponsoring company will usually tell you which medical to book, and may direct you to a specific clinic.
Check the certificate’s validity too. Under the MLC, the maximum validity is two years, or one year for seafarers under 18, and a separate color vision certification can last up to six years. Individual doctors can issue a shorter validity if they want to review a condition sooner.
What the approved doctor actually checks, from eyesight to heart and hearing
The examination is a general medical assessment with extra attention to what matters at sea. Exact tests vary by flag state, but an ENG1-style examination typically includes the following.
Medical history and declaration
You complete a form listing past and present conditions, operations, hospital admissions, medications, allergies, and any history of fits, fainting, mental health treatment, or substance problems. The doctor goes through it with you.
Answer accurately and completely. A false or incomplete declaration can invalidate a certificate, and a condition that surfaces later during a voyage can lead to repatriation and disciplinary or contractual consequences. Doctors also see much of this information; an omission that comes to light through your medical records or GP letter is far more damaging than an honestly declared condition.
Height, weight and general condition
The doctor records height and weight and calculates body mass index. A high BMI does not automatically result in a fail, but it prompts further questions and tests, because obesity is associated with high blood pressure, diabetes, sleep apnoea and reduced ability to move quickly through confined spaces or climb a vertical ladder in an emergency.
Eyesight
Vision testing usually has several parts:
- Distance and near visual acuity, with and without glasses or contact lenses.
- Color vision, tested with plates or a lantern test. Standards are stricter for deck officers and ratings who keep a lookout because they must distinguish navigation lights and signals.
- Visual fields, which show whether your peripheral vision is intact.
- Sometimes they check for night blindness or other eye conditions.
Standards differ between departments. Deck roles generally have tighter vision standards than engine or catering roles, so a result acceptable in one department may mean a restriction in another. If color vision is a concern, find out before you commit to a deck career path.
Hearing
A hearing test, usually through audiometry, checks that you can hear well enough to detect alarms, follow spoken instructions in noisy spaces and communicate by radio. Some hearing loss is tolerated, and hearing aids may be accepted in some cases, but the rules differ by flag and by role.
Heart, blood pressure and circulation
The doctor takes your blood pressure and pulse and listens to the heart and lungs. Depending on your age, history and findings, you may be asked to have an electrocardiogram (ECG) or to bring a specialist report. A blood pressure reading that is over the limit on the day does not always mean a fail, but it often leads to a deferral while you have it checked and treated.
Urine and, where required, blood tests
A urine sample is tested for protein, glucose and blood, which can point to kidney disease, diabetes or other conditions. Some employers and flag states also require blood tests, and some require drug and alcohol screening. Ask your employer in advance.
Physical examination
The doctor examines your abdomen, joints, spine, limbs and nervous system. The aim is to confirm that you can move, climb, lift and work in confined spaces, and to look for hernias, joint problems, balance problems or other issues that could cause injury or prevent you from carrying out emergency duties. The musculoskeletal check also links to the work covered in the article on ergonomic practices to avoid injury for seafarers.
Mental health and general function
Doctors ask about mental health history, sleep, mood and any current treatment. Having a mental health condition does not by default make you unfit. What matters is whether the condition is stable, treated and unlikely to put you or others at risk in an isolated, demanding environment. The outcome often depends on a letter from your treating clinician.
Conditions that cause deferrals, restrictions or a fail, and what you can do about them
An examination has four broad outcomes. The labels vary by country, but in the UK system you will typically see one of these:
- Fit for unrestricted service. You can work in your chosen role, on any ship type, in any trading area.
- Fit with restrictions. You may be limited, for example, to certain departments, to near-coastal or home-trade voyages, to ships with a doctor on board, or to roles that do not involve lookout duties.
- Temporarily unfit, or deferred. The doctor needs more information or time before deciding, or you need treatment first.
- Permanently unfit. The condition cannot be managed to the standard required for sea service.
The following conditions are the ones most likely to lead to a deferral or restriction. A flagged condition does not mean you are finished, and many people go on to receive a certificate once the condition is investigated or controlled.
- High blood pressure. Often deferred until it is treated and stable. This is one of the most common reasons for delay.
- Diabetes. Diet-controlled and tablet-controlled diabetes can often be managed with a restricted or conditional certificate and regular review. Insulin-treated diabetes receives particular scrutiny and usually needs specialist evidence.
- Heart conditions. Previous heart attack, rhythm disorders, heart valve problems and cardiomyopathy usually require specialist reports and sometimes further tests.
- Epilepsy and episodes of loss of consciousness. These raise serious safety concerns at sea. Rules usually require a seizure-free period and neurological evidence, and some roles may remain closed.
- Vision and color vision problems. Reduced acuity, restricted visual fields, or color vision deficiency can restrict deck roles.
- Hearing loss. Significantly restricts roles, particularly for watchkeeping roles.
- Sleep apnoea. Untreated sleep apnoea is a fatigue and safety concern. Doctors often want evidence that it is diagnosed and effectively treated.
- Mental health conditions. Current instability, recent alertness-affecting medications, or reduced alertness can cause doctors to assess treatment. Treated, stable, assessed individually.
- Substance misuse. Current dependence is a barrier, and the doctor may ask for evidence of sustained recovery.
- Medications. Some drugs cause drowsiness, affect concentration or require monitoring that is difficult at sea, and others are restricted in certain countries or ports.
- Musculoskeletal problems. Back, joint or mobility problems that limit climbing, lifting or emergency response.
The best response to a possible problem is to deal with it before the examination. If you already know you have a condition, ask your GP or specialist for a letter describing the diagnosis, treatment, current stability, and any activity limits. Bring it to the appointment. Doctors can make better decisions with evidence in front of them, and a letter often turns a deferral into a pass or a limited restriction.
How to prepare in the weeks before your appointment
Most delays come from paperwork and unaddressed issues, not from the examination itself. Use the weeks beforehand like this.
- Confirm which certificate you need. Ask your employer, agency, or training provider which certificate they accept, which doctors or clinics they use, and whether any extra tests or vaccinations are required.
- Book early. Appointments with approved doctors can fill up, particularly at the start of a cadetship intake or peak crewing periods. Leave enough margin so a deferral doesn’t push you past your joining date. Ask about the fee when you book, so it contains no surprises.
- Get your own health checked first. If you have concerns about blood pressure, vision, hearing or any known condition, see your GP or optician beforehand. Treating or documenting a problem before the examination is much quicker than doing it afterward.
- Gather your documents. Bring photo identification, any previous medical certificate, your most recent glasses or contact lens prescription, a list of current medications with doses, and letters from specialists for any ongoing conditions.
- Bring your aids. Wear or bring your glasses, contact lenses, and hearing aids, as we will test you with the correction you actually use.
- Complete the form honestly. Go through the declaration carefully at home if you are given it in advance, and check dates of operations, diagnoses and treatments with your records.
- Look after yourself in the days before. Sleep properly, avoid alcohol the night before, and eat normally. Raised blood pressure from caffeine, poor sleep or rushing to the clinic can produce a misleading reading, so arrive in good time and calm.
- Ask about the vaccinations and dental checks your employer requires. These aren’t always part of the ENG1 itself, but many employers require them separately, and leaving them until the last minute can delay onboarding.
General fitness supports the physical side of the examination and matters once you are on board. The article on maintaining physical fitness on board a ship covers the habits that carry over from preparation to life at sea.
What to do if you are declared unfit or given restrictions
A deferral, restriction or fail is stressful, but you usually have options, and the first step is to understand the decision precisely.
Ask for the reason in writing. The doctor should tell you which standard you did not meet and what, if anything, would change the outcome. Ask what evidence would be needed, such as a specialist report, a repeat blood pressure reading after treatment or an ECG.
Find out whether the problem is temporary. Many deferrals resolve once a condition is treated or investigated. High blood pressure may settle on medication, a vision problem may be corrected with lenses, and a test result may simply need repeating. Return to the same doctor with the evidence they asked for.
Consider whether a restriction is workable. A restricted certificate may still allow you to pursue the career you want. A limitation to certain ship types, trading areas or departments could be acceptable, or it could rule out your intended role. Discuss it with your employer or training provider before accepting or rejecting it.
Use the review process if you disagree. The MLC requires that a seafarer who is refused a certificate or has a limitation placed on their work can obtain a second examination by another independent medical practitioner or an independent medical referee. How this works depends on the flag state. In the UK, the MCA handles it, and an approved doctor can explain the procedure. Ask about application deadlines and any fees.
Tell your employer or training provider early. A cadetship or contract often has a start date, and employers handle delays more easily when they hear early and you have a plan. Explain what the doctor needs and when you expect to have it.
Think about alternative roles. If a condition rules out one department, another may still be open to you. Standards vary by role, and your training provider or an industry careers adviser can help you assess your options. The article on getting started in the maritime industry is a useful reference if you are weighing different routes.
Keeping your certificate valid so it never holds up a joining date
A certificate has an expiry date, and the most avoidable delays come from letting it lapse.
- Know your expiry date and set a reminder. Put it in your calendar well ahead, at least a few months, so you have room for appointments, specialist letters, or repeat tests.
- Renew before you need to. Some employers won’t let you join a ship with a certificate that expires during the contract, or within a certain period after you join. Check your employer’s policy, since it can be stricter than the legal minimum.
- Understand what happens if it expires at sea. Under the MLC, if a certificate expires during a voyage, it generally remains in force until the next port where a recognized medical practitioner is available, within a limited period of up to three months. This safeguards ships already at sea and should not be relied on when planning a joining date.
- Keep a copy of the certificate and your supporting letters. Carry the original, keep a digital copy, and store any specialist reports that explain a restriction. Port state inspectors, employers and crewing agents may ask for them.
- Report changes in your health. If you develop a new condition or start new medication between examinations, check whether it affects your fitness. Employers and flag states generally expect you not to work if you know you no longer meet the standard, and you may have a duty to report certain changes.
- Keep your records tidy for each renewal. Medication lists, specialist letters and previous certificates make each renewal quicker, especially if you have a managed condition.
Looking after your general health between examinations makes renewals easier. Good sleep, sensible nutrition, and managing stress all affect the readings and results the doctor sees. The article on the seafarer’s safety and wellbeing roadmap covers these areas in more depth.
The ENG1 and its equivalents check whether your health supports the work you will do in a place where help arrives slowly. Seafarers who identify the right certificate, declare their history accurately, and arrive with the right documents usually pass without trouble; those who are deferred can often resolve the issue with the right evidence. Treating the medical as part of your preparation, with the same attention you give to your training courses and sea service, keeps it from delaying your first ship.
This article was created with AI assistance and reviewed by a human editor.
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