Before you book a safety course, before you apply for a cadetship, before you send a CV to a single yacht or shipping company, there is one appointment that determines whether any of it is possible: the ENG1 medical.
It is a statutory examination carried out by a doctor specifically approved by the Maritime and Coastguard Agency. Pass it and you are medically fit to work at sea. Fail it and no legitimate UK-flagged employer can put you on a vessel, regardless of your qualifications, your experience or how much you want the job.
People get this wrong in both directions. Some assume it is a formality and are badly shaken when they fail. Others assume a minor health condition rules them out and never apply, when in fact it would not have. Both mistakes are expensive — the first because you have already paid for training, the second because you talked yourself out of a career.
What the ENG1 actually is
The ENG1 is the standard UK seafarer medical fitness certificate. The requirement sits in UK merchant shipping regulations, which implement the medical standards set out under the STCW convention and the Maritime Labour Convention.
The point of it is not general health screening. It is a specific question: can this person work safely at sea, and will they be a danger to themselves or others if their condition deteriorates in a place with no hospital?
That framing explains almost every decision in the process. A condition that is entirely manageable ashore can be disqualifying at sea, not because it is severe, but because the consequence of an episode is different when the nearest emergency department is three days away and the helicopter cannot fly in the weather.
Only an MCA-approved doctor can issue an ENG1. Your GP cannot, however well they know you. The MCA publishes the list of approved doctors, and you book directly with one.
What happens in the appointment
Expect somewhere between twenty minutes and an hour. It is not an ordeal, and it is not a military-style assessment.
Paperwork and history. You complete a declaration of your medical history — past and present conditions, surgery, medication, mental health, drug and alcohol use. This is the part people are tempted to shade, and it is the worst possible place to do it.
Vision. Distance, near and colour vision. The standard depends on the role. Deck officers and anyone with navigational watchkeeping duties face a stricter colour vision standard than engine or catering departments, for the obvious reason that navigation lights and signal flags are colour-coded.
Hearing. Usually an audiogram. You need to be able to hear alarms and communicate.
Physical examination. Height, weight, blood pressure, pulse, heart and chest, abdomen, reflexes, mobility. The doctor is checking whether you can physically do the job: climb a vertical ladder, close a watertight door, don a lifejacket, evacuate.
Urine test. Primarily for sugar and protein.
The doctor may ask for further information from your GP or a specialist before deciding. That is normal and not a bad sign; it usually means they want to record that a condition is well controlled rather than guess.
The three outcomes
Fit. The certificate is issued, usually valid for up to two years, with a shorter period for those under eighteen. You may be recorded as fit with restrictions — for example, fit for near-coastal voyages only, or fit subject to wearing corrective lenses.
Temporarily unfit. Something needs resolving first. A blood pressure reading that needs treating, a recent operation you need to recover from, a condition that needs investigating. You come back when it is sorted.
Permanently unfit. Rare, and the doctor must explain why and tell you about your right to seek a review.
The middle outcome is by far the most common of the three negative ones, and it is the one people catastrophise about unnecessarily.
Why people actually fail
Blood pressure. The most common single reason. Often it is genuinely elevated; often it is anxiety about the examination itself. If you know yours runs high, get it measured and if necessary treated well before the appointment. Treated, controlled blood pressure is generally acceptable. Untreated, uncontrolled blood pressure is not.
Body mass index. This is not about appearance. It is about whether you can physically get through an escape hatch, climb to a muster station, and be carried by colleagues if you are unconscious. There is a practical element to it, and a high BMI alone is not automatically disqualifying if mobility and fitness are demonstrably fine.
Colour vision. Specific to deck roles, and a genuine hard stop for navigational watchkeeping. The frustrating part is that it is congenital and unfixable — but it does not bar you from the industry. Engineering, catering, hotel and many shore-side roles apply different standards.
Uncontrolled diabetes. Diabetes is not automatically disqualifying. Diabetes with poor control, or a history of hypoglycaemic episodes, very often is, because an episode on watch is a danger to the whole vessel.
Epilepsy and seizure history. Treated very cautiously for the same reason.
Mental health. Here the picture is more nuanced than rumour suggests. A history of depression or anxiety is not an automatic bar. What matters is stability, insight, whether treatment is working, and whether the condition is likely to deteriorate during a long tour far from support.
Medication. Not the condition but the drug. Anything that causes drowsiness, impairs judgement, requires refrigeration, or cannot be interrupted without serious consequence raises questions on a vessel weeks from a pharmacy.
Do not conceal anything on the declaration
If a concealed condition emerges later — and it tends to, because sooner or later you need medical attention — the consequences are considerably worse than the original condition would have been. Your certificate can be revoked. Your employer can dismiss you. Insurance cover for an incident connected to the condition can be disputed.
Declare everything and let the approved doctor decide. They assess seafarers all day and have seen your condition before. Many things people worry about turn out to be fine once documented.
If you fail
Ask exactly why, in writing. You cannot address a problem you have not had defined.
If it is temporary, get the date. Find out precisely what needs to change and when you can be reassessed.
Use the review process. If you believe the decision is wrong, there is a formal route to have it reviewed by an MCA medical referee.
Consider a different department. This is the advice most often missed. Colour vision deficiency that rules out the deck department does not rule out engineering. A restriction to near-coastal work does not prevent a career; it shapes which vessels you work on — and the domestic, ferry, offshore wind and harbour sectors are substantial employers.
Consider the shore side. Shipping is far bigger than the ships. Chartering, port operations, surveying, insurance, logistics, regulation and training require no ENG1 at all. Our article on maritime careers ashore covers this in detail.
Validity, renewal and cost
A standard ENG1 is valid for up to two years for adults, and can be issued for a shorter period where the doctor wants to review a condition sooner. You renew by taking the examination again.
Fees are set by each approved practice rather than centrally, so it is worth calling two or three. Some employers and most cadetship sponsors cover the cost — check before you pay.
Where it sits in the sequence
The ENG1 comes first. Before the safety course, before the applications, before anything.
The reason is financial. STCW Basic Safety Training costs real money and five days of your life, and a cadetship application consumes months. Discovering a medical problem after you have spent both is a bad way to find out.
How Navalis UK fits
We cannot issue an ENG1 and we cannot influence one. What is worth saying is that our programmes are studied online, so your medical status does not determine whether you can study with us. People who are temporarily unfit often use that period productively, and people who are permanently unfit for sea service frequently move into the shore-side roles our logistics and fleet management and port and marina management programmes are built around.
Recognition of any programme depends on which one you complete and on the regulations of the country where you intend to work. We put that in writing before anyone enrols — see recognition and accreditations.
Frequently asked questions
Can my own GP do the ENG1?
No. Only a doctor specifically approved by the Maritime and Coastguard Agency can carry out the examination and issue the certificate.
How long is an ENG1 valid?
Up to two years for adults, less for those under eighteen or where the doctor wants to review a condition sooner.
Will glasses or contact lenses fail me?
No. Corrected vision is assessed. You may be issued a certificate with a restriction requiring you to wear your correction and carry a spare pair.
Does colour blindness end a career at sea?
It closes the deck and navigational watchkeeping route. It does not close engineering, catering, hotel or shore-side roles, which apply different standards.
I take antidepressants. Am I automatically unfit?
No. What is assessed is stability, how well treatment is working, and the likelihood of deterioration during a long tour. Declare it and let the approved doctor assess it.
What if I disagree with the result?
There is a formal review process through an MCA medical referee. Ask the examining doctor how to initiate it.
The next step
Find an MCA-approved doctor, book the appointment, and be honest on the form. It is the cheapest and fastest way to find out whether a career at sea is open to you.
If it is, the next question is which route — see how the Certificate of Competency ladder works or browse all Navalis UK programmes. If it is not, the shore side of this industry is larger than the seagoing side and the door is wide open.