Maritime Knowledge Base

What is sea time and why is it required for certificates of competency?

Sea time is the period of approved service at sea a seafarer must complete to qualify for each certificate of competency — proof of real experience, recorded and verified.

What is a Certificate of Competency (CoC) and how do I get one?

What a CoC is, the STCW rank levels it comes in, and the sea time, courses and exams needed to earn and raise one.

How do you become a ship captain (Master) in the merchant navy?

Becoming a ship's captain means progressing through the deck department from cadet to Master, building sea time and passing successive Certificates of Competency.

How do you become a marine engineer on ships?

Becoming a marine engineer means entering the engine department through a cadetship or engineering degree and progressing by sea time and Certificates of Competency.

How do you become a chief engineer on a ship?

The chief engineer heads the engine department — reaching the rank requires management-level certification and years of sea time as a watchkeeping and second engineer.

How long does it take to become a ship captain in the merchant navy?

Becoming a Master typically takes somewhere around eight to twelve years from cadet, depending on the individual, the flag and how quickly sea time and certificate examinations are completed.

What shore-based jobs can experienced seafarers move into?

Experienced seafarers are in demand ashore for a wide range of maritime roles — surveying, pilotage, ship management, training, insurance and port work — where their sea experience is essential.

How do I join the Merchant Navy in India?

The main DG Shipping-approved routes for Indian candidates — IMU CET degrees, sponsored DNS cadetships, and GME after engineering — with eligibility and the pitfalls to avoid.

What is a cadetship and how long does it last?

What a merchant-navy cadetship involves, how long the sea phase lasts, and why the Training Record Book matters.

How much do merchant navy officers earn?

What drives merchant-navy pay — rank, ship type, company and trade — and why officer salaries are usually quoted per month at sea.

What are the disadvantages and challenges of a merchant navy career?

A merchant navy career has real downsides — long separation from family, isolation, demanding work and health pressures — that anyone considering it should understand.

What is an electro-technical officer (ETO) and what do they do?

An electro-technical officer is a specialist engine-department officer responsible for a ship's electrical, electronic and control systems, a rank formalised under STCW.

What is the IMU CET entrance exam in India?

IMU CET is the Indian Maritime University Common Entrance Test, the entrance examination for maritime degree courses at IMU and affiliated colleges in India.

What are the Marine Engineer Officer (MEO) Class examinations?

The MEO Class examinations are the engineer certificates of competency used in India and some other countries, progressing from Class 4 up to the Class 1 chief engineer's certificate.

What are the ranks and hierarchy in the merchant navy?

A merchant ship's crew is organised into the deck, engine and catering departments, each with a clear hierarchy of officers and ratings under the overall command of the Master.

Can women join the merchant navy and what roles can they hold?

Yes — women can and do serve in every department and rank of the merchant navy, from cadet to Master and chief engineer, and the industry is actively working to recruit more.

How do you become an electro-technical officer (ETO)?

Becoming an ETO means entering the engine department through an electrical or electronic background, completing approved training and sea service, and gaining the STCW electro-technical officer certificate.

What is a dynamic positioning operator and how do you become one?

A dynamic positioning operator controls the system that automatically keeps an offshore vessel precisely on station, a specialised and well-paid skill built on a deck-officer background.

What qualifications and requirements are needed to join the merchant navy?

Joining the merchant navy generally requires a good secondary education with science and maths for officer routes, medical and eyesight fitness, meeting age limits, and completing STCW training.

What is a seafarer employment agreement (SEA)?

A seafarer employment agreement is the written contract, required under the Maritime Labour Convention, that sets out the terms of a seafarer's employment aboard ship.

What does STCW mean?

STCW explained — the international convention that sets minimum training, certification and watchkeeping standards for seafarers worldwide.

What should be checked during engine-room watchkeeping rounds?

How to make an engine-room round count — comparing live readings against normal ranges and catching trends before they become failures.

Why is my marine fuel pump showing low pressure?

A structured checklist for low fuel-pump pressure — suction restrictions, air ingress, relief valves, worn elements and viscosity — before you touch the set point.

What is deadweight tonnage (DWT)?

Deadweight tonnage defined — the total weight a ship can carry — and how it differs from displacement and gross tonnage.

Why is my fuel or oil purifier not separating properly?

The usual causes of poor purifier separation — feed rate, temperature, gravity disc and water seal, sludge and bowl condition — and how to work through them one at a time.

What is a TEU?

TEU explained — the twenty-foot equivalent unit used to measure container-ship capacity and container throughput.

What are the key steps in a safe bunkering operation?

The essentials of safe bunkering — the agreed plan and checklist, scuppers and SOPEP readiness, communication, monitoring and verifying the figures.

What is SOLAS?

SOLAS explained — the IMO's most important safety convention and the areas of ship safety it governs.

What is ballast water and why is it managed?

What ballast water is, why ships carry it, and why it is now exchanged or treated under the Ballast Water Management Convention.

Is the merchant navy a good career choice?

The merchant navy offers high pay, tax advantages, world travel and structured progression, balanced against long periods away from home — here is an honest assessment.

What is the man overboard (MOB) procedure on a ship?

When someone falls overboard, immediate, drilled actions — raising the alarm, marking the position and turning the ship back — give the best chance of recovery.

What is an inert gas system on a tanker and why is it needed?

An inert gas system fills a tanker's cargo tanks with oxygen-poor gas so the atmosphere cannot support combustion, preventing explosions in and around the cargo.

What medical and eyesight standards are required to join the merchant navy?

Seafarers must pass a seafarer medical examination covering general fitness, eyesight and colour vision, and hearing — the standards protect safety at sea.

What is a snap-back zone and why is mooring so dangerous?

A snap-back zone is the area a mooring line may whip through if it parts under tension — mooring decks are among the most dangerous places on a ship.

What is a risk assessment on a ship and how is it done?

A shipboard risk assessment systematically identifies the hazards of a task, evaluates the risk and puts controls in place before the work begins.

How do you join the merchant navy in the Philippines?

The Philippines is one of the world's largest suppliers of seafarers — entry is through a maritime degree, cadetship and certification overseen by MARINA.

How do you join the merchant navy in the United Kingdom?

In the UK, most people enter the merchant navy through a sponsored officer cadetship that alternates college study with sea phases, leading to MCA certification.

What is the procedure for anchoring a ship?

Anchoring safely means preparing the gear, approaching the chosen spot slowly against wind and tide, letting go with controlled cable, and keeping an anchor watch.

How is a navigation (bridge) watch properly handed over?

A bridge watch handover requires the relieving officer to be fully oriented — position, traffic, course and dangers — before accepting the watch, and never mid-manoeuvre.

How does a marine boiler work?

A marine boiler generates steam by transferring heat to water — this covers the working principle and the difference between oil-fired and exhaust-gas boilers.

How does a marine centrifugal oil purifier work?

A marine purifier cleans fuel and lubricating oil by spinning it at high speed so that water and solids separate out — here is the working principle.

What are the four stages of passage planning (appraisal, planning, execution, monitoring)?

Passage planning follows four stages — appraisal, planning, execution and monitoring — that together prepare and carry out a safe voyage from berth to berth.

What is a garbage management plan and what does MARPOL require?

A garbage management plan sets out how a ship collects, separates, stores and disposes of its garbage in line with MARPOL Annex V, which bans plastics disposal at sea.

How does marine radar and ARPA work?

Marine radar detects other ships and land by transmitting radio pulses and timing their echoes; ARPA automatically tracks targets and calculates the risk of collision.

What is cylinder lubrication in a two-stroke marine engine?

Cylinder lubrication is the separate oil supply fed onto the liner of large two-stroke engines to lubricate, neutralise fuel acids and keep the surfaces clean.

What is the difference between the merchant navy and the (military) navy?

The merchant navy is the commercial fleet that carries cargo and passengers for trade, crewed by civilian seafarers, while the navy is a country's military maritime force.

How does a ship's steering gear work?

The steering gear is the powered hydraulic machinery that turns the rudder in response to helm orders from the bridge, using rams or rotary vanes driven by pumps.

How does a ship's sewage treatment plant work?

A marine sewage treatment plant breaks down the ship's sewage — usually biologically — and disinfects it so that the treated effluent meets MARPOL Annex IV discharge standards.

How is a cargo tank cleaned on a tanker?

Cargo tanks are cleaned with fixed or portable washing machines using water or crude oil, followed by draining, gas-freeing and ventilation, before a change of cargo, entry or repair.

What is the difference between a controllable-pitch and a fixed-pitch propeller?

A fixed-pitch propeller has blades set at one permanent angle, while a controllable-pitch propeller can rotate its blades to vary thrust and go astern without reversing the engine.

What is under keel clearance and why is it important?

Under keel clearance is the vertical gap between the lowest point of a ship's keel and the seabed — a safety margin that must be maintained to avoid grounding.

What is an indicator diagram and what does it tell the engineer?

An indicator diagram plots the pressure inside an engine cylinder against volume or crank angle, letting the engineer assess the power, condition and faults of each cylinder.