To join the merchant navy, you choose a job stream (deck, engine, or rating), meet age/education/medical rules, clear required entrance exams, complete preā€‘sea training, then get placed on ships as a cadet.

What is the merchant navy?

The merchant navy is the civilian fleet that carries cargo and passengers worldwide; it is not the same as a countryā€™s navy or defence forces. You work on commercial ships like container vessels, tankers, bulk carriers, cruise ships, or offshore support vessels.

Main career streams

  • Deck department (navigation side)
    You handle navigation, cargo operations, safety, and ship management; typical course options are Diploma in Nautical Science (DNS) or B.Sc Nautical Science after class 12 with Physics, Chemistry, Maths.
  • Engine department (technical side)
    You look after engines and machinery; common routes are B.Tech Marine Engineering or related marine engineering diploma/graduateā€‘entry programs.
  • Ratings (support crew)
    These roles include deck ratings, engine ratings, and catering ratings, usually entered after class 10 or 12 plus short approved preā€‘sea rating courses.

Basic eligibility (Indiaā€‘focused, similar elsewhere)

  • Education:
    • Officer level: class 12 with PCM (Physics, Chemistry, Maths), usually 60% aggregate for deck/engine officer programs.
* Ratings: often class 10 or 12, depending on course.
  • Age:
    Typical age band is about 17ā€“25 years at the time of course admission (varies slightly by institute and course).
  • Medical & eyesight:
    You must clear a seafarer medical test and be declared fit, including normal color vision and eyesight within set limits (for deck especially). A healthy BMI and overall physical/mental fitness are essential and may be checked through approved doctors.
  • Other requirements:
    Good English communication, valid passport, and the ability to pass background checks and drug/alcohol screening as per maritime rules.

Stepā€‘byā€‘step process after class 12 (India example)

1. Check eligibility

Confirm your age, marks in PCM, and medical fitness before spending on forms or coaching.

2. Choose your department

  • If you like navigation, math, and being on the bridge, pick the deck department (DNS or B.Sc Nautical Science).
  • If you enjoy machines and engineering, pick the engine department (B.Tech Marine Engineering or similar).
  • If you prefer a shorter route with more handsā€‘on work, consider rating courses.

3. Clear entrance tests

For India, the common route for officers is:

  • Give IMU CET (Indian Maritime University Common Entrance Test) for central university and affiliated colleges, which covers Physics, Maths, English, and general knowledge.
  • Also attempt companyā€‘sponsored exams/interviews (e.g., Anglo Eastern, Great Eastern and other shipping companies) that test aptitude, basics of PCM, English, and reasoning.

4. Get sponsorship or college admission

  • Companyā€‘sponsored route :
    First clear a companyā€™s written exam, psychometric tests, and interviews to get a sponsorship letter, then join its tieā€‘up maritime college for preā€‘sea training.
  • Direct college route :
    Use your IMU CET rank and board marks to get a seat in an approved maritime college (for DNS, B.Sc Nautical Science, or B.Tech Marine Engineering).

5. Do preā€‘sea training

Enroll in a DG Shipping (or respective national authority) approved Maritime Training Institute for preā€‘sea training (often 1 year for DNS or similar programs).

  • You study navigation, seamanship, cargo work, marine engineering basics, safety, and maritime law.
  • You must complete STCW safety courses (Standards of Training, Certification and Watchkeeping) that are mandatory to work on ships.

6. Join a ship as cadet or trainee

After preā€‘sea:

  • Deck students join as Deck Cadet; engine students join as Trainee Marine Engineer; ratings join in junior roles.
  • This is where you gain structured seaā€‘time (months of work experience recorded in a training book/log).

7. Pass competency exams and move up ranks

With enough seaā€‘time and required courses, you appear for competency exams conducted by the maritime administration (e.g., DG Shipping in India, USCG in USA, etc.).

  • Deck side: Deck Cadet ā†’ Third Officer ā†’ Second Officer ā†’ Chief Officer ā†’ Captain (Master).
  • Engine side: Trainee ā†’ Fourth Engineer ā†’ Third Engineer ā†’ Second Engineer ā†’ Chief Engineer.

Brief path in the US (Merchant Marine)

If you are in or planning for the US:

  • Choose a path (deck, engine, or unlicensed rating).
  • Complete a mariner training program (maritime academy or approved school).
  • Apply for TWIC (Transportation Worker Identification Credential).
  • Pass physical exam and drug screening.
  • Apply for MMC (Merchant Mariner Credential) through the US Coast Guard.
  • Join an apprenticeship or company program and sail to build experience and upgrade credentials.

Common entrance routes and courses (India)

Path Min. qualification Typical course Key filter
Deck Officer 12th PCM, ~60% DNS, B.Sc Nautical Science IMU CET + sponsorship/college admission
Engine Officer 12th PCM + entrance B.Tech Marine Engineering IMU CET + medical + college admission
Ratings (Deck/Engine) 10th or 12th Preā€‘sea rating courses Institute entrance + medical
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Key tips and current context (2025ā€“2026)

  • Job market goes up and down with global trade and shipping cycles, so some years placements are tighter and competition is higher.
  • Many experienced seafarers advise checking institute approval status, placement records, and hidden costs before paying big fees.
  • Forums and guidance sites now offer tools like profileā€‘based college suggestions and BMI/medical checks to see if you are suitable for sea life.

Mini checklist before you decide

  • Are you medically fit (eyes, color vision, BMI, stamina)?
  • Are you comfortable staying away from home for months and working in a strict, shiftā€‘based environment?
  • Have you verified that the college and course are approved by the national maritime authority (e.g., DG Shipping in India)?
  • Do you understand the pathway of ā€œcourse ā†’ seaā€‘time ā†’ exams ā†’ promotionā€ and that promotions require passing tough exams?

One simple example path (deck, India)

12th with PCM ā†’ IMU CET + company sponsorship exam ā†’ 1ā€‘year DNS at approved institute ā†’ 18 months as Deck Cadet ā†’ 2nd Mate (FG) exam ā†’ Third Officer ā†’ sail more and clear higher competency exams.

This is just one route; engine and ratings paths are structured similarly but with different courses and rank names.

TL;DR : To join the merchant navy, pick deck/engine/rating, clear entrance tests (like IMU CET or national equivalents), join an approved maritime course with medical fitness, complete preā€‘sea and STCW training, then sail as a cadet and clear further competency exams to rise in rank.

Information gathered from public forums or data available on the internet and portrayed here.