Merchant Navy Medical Test: Entry Requirements and What to Expect
What the merchant navy medical test covers, how the UK ENG1 and US Coast Guard medical certificates differ, and the conditions that most often cause a fail.
What a Merchant Navy Medical Test Covers
The test is a quick, non‑invasive check that a doctor approved by the flag administration can perform in about 30 minutes. It records height, weight, BMI, blood pressure, pulse, vision (distance, near, color for watch‑keepers), hearing, urine for diabetes and kidney markers, and a general physical exam of heart, lungs, abdomen, joints and mobility. The doctor also reviews your medical history, current medication and mental health record. Any omission can void the certificate and terminate a contract.
UK Pathway: The ENG1 Certificate
In the United Kingdom the Merchant Shipping Certificate of Medical Fitness, known as the ENG1, is issued by an MCA‑approved doctor under the Maritime and Coastguard Agency. It is required for work on UK‑registered merchant ships and for anyone applying for a UK Certificate of Competency. For applicants over 18 the ENG1 is valid for up to two years; younger applicants receive a shorter period.
The MCA publishes Merchant Shipping Notice 1815, listing countries whose national seafarer medical certificates are accepted as equivalent to the ENG1. The four possible outcomes are fit without restriction, fit with restrictions, temporarily unfit, or permanently unfit.
US Route: Coast Guard Medical Certificate
U.S. mariners apply to the Coast Guard for a medical certificate under 46 CFR Part 10, Subpart C. Evidence is submitted on form CG‑719K (or CG‑719K/E for entry‑level applicants without an STCW endorsement). Vision standards are set at 46 CFR 10.305 and hearing at 46 CFR 10.306. The Coast Guard may issue the certificate without limitation, with limitations or waivers, or decline it.
The certificate’s validity depends on the mariner’s endorsements; STCW‑endorsed mariners renew more frequently than those working only domestically. Unlike the UK, the U.S. decision is made after the Coast Guard reviews the submission, so allow time for processing before a joining date.
Common Reasons for Restrictions or Failure
- Blood pressure – untreated or poorly controlled hypertension is the most frequent cause of deferral and is usually correctable before the exam.
- Color vision – a deficiency rarely ends a career but typically limits deck duties and steers candidates toward engineering, electro‑technical or catering roles.
- Diabetes – diet‑controlled diabetes can be managed with restrictions; insulin treatment raises concerns about hypoglycaemia during a watch.
- Body mass and mobility – the test looks at functional ability: climbing a ladder, passing an escape hatch, donning a lifejacket and working in a machinery space.
- Cardiac, neurological and psychiatric history – epilepsy, significant cardiac events or conditions requiring continuous specialist care usually need supporting specialist reports.
- Medication – sedatives and drugs that fail badly if resupply is interrupted on a long voyage attract scrutiny.
How to Prepare and What If You’re Found Unfit
Book early, arrive well‑rested, and bring photo ID, your discharge book or credential, a list of current medications with doses, glasses or contacts, and any specialist letters. Avoid heavy caffeine, intense exercise, dehydration or a night shift immediately before the blood pressure check. A temporary unfit decision is not career‑ending; it usually names a condition to treat and a waiting period before re‑examination. Administrations provide an appeal route to an independent medical referee for decisions that appear incorrect.
If you plan a cadetship, sit the medical before paying for STCW basic safety training – failing afterward is costly.
Why This Matters to Seafarers and Cadets
The medical certificate is the single gatekeeper to any merchant ship. A clear, honest assessment protects you, your shipmates and the vessel, especially when the nearest hospital is days away and no doctor is on board. Understanding the exact requirements, common pitfalls and how to prepare can save time, money and career momentum.
Next Steps for Prospective Mariners
Check the MCA website for ENG1 details or the Coast Guard portal for U.S. medical certification. If you hold a foreign certificate, review Merchant Shipping Notice 1815 before booking a new exam. For further guidance, visit Marine Insight 360’s Knowledge Base section on Medical Certification .
Operational context
In daily maritime work, merchant navy medical test should be compared with vessel type, flag requirements, company procedures, port expectations, cargo risk and crew competence. The same topic can look different on a container ship, bulk carrier, tanker, offshore vessel, training ship or shore-side logistics desk.
That is why this article avoids treating the subject as a standalone headline. It connects the issue with the checks that cadets, officers, ratings, recruiters and maritime students can use when reading a report, preparing for a voyage, reviewing a procedure or planning a career step.
For related career routes, eligibility and rank guidance, continue with the merchant navy career hub.
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