Maritime Knowledge Base
Browse questions and answers across marine machinery, merchant navy careers, shipboard operations and maritime glossary terms.
Browse by Category
Marine Machinery
Troubleshooting guides for pumps, boilers, purifiers, compressors and auxiliary systems.
Merchant Navy Careers
Questions about joining the merchant navy, exams, cadetships, ranks and sea-time.
Maritime Glossary
Plain-English definitions of shipping, engine-room, navigation and regulatory terms.
Shipboard Operations
Practical Q&A for watchkeeping, safety, maintenance routines and onboard documentation.
Results for "Rank"
What causes a crankcase explosion in a marine engine?
Crankcase explosions are caused by oil mist igniting after a hotspot overheats the lubricating oil — understanding the mechanism is key to preventing them.
Merchant Navy CareersWhat 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.
Merchant Navy CareersShould I choose the deck or engine department?
How the deck and engine career paths differ — daily work, skills, ranks and progression — so you can pick the one that fits you.
Merchant Navy CareersWhat 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.
Merchant Navy CareersHow 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.
Merchant Navy CareersHow 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.
Merchant Navy CareersWhat 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.
Merchant Navy CareersCan 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.
Marine MachineryWhat 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.
Maritime GlossaryWhat does STCW mean?
STCW explained — the international convention that sets minimum training, certification and watchkeeping standards for seafarers worldwide.
Maritime GlossaryWhat is a TEU?
TEU explained — the twenty-foot equivalent unit used to measure container-ship capacity and container throughput.
Marine MachineryWhy won't my marine air compressor build pressure?
A first-principles check for a compressor that runs but won't build pressure — valves, unloader, leaks, rings and cooling.
Merchant Navy CareersIs 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.
Marine MachineryWhy is the main engine lubricating oil pressure low?
Low lubricating oil pressure is a serious alarm that threatens the bearings — the cause is usually in the pump, the filters, the oil itself, or a leak.
Merchant Navy CareersWhat are the four STCW basic safety training courses?
Before joining a ship, every seafarer must complete STCW basic safety training — four short courses covering survival, firefighting, first aid and personal safety.
Shipboard OperationsWhat 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.
Marine MachineryHow does a marine diesel engine work?
A marine diesel engine converts the chemical energy of fuel into rotary motion through compression ignition — here is the working principle and the two-stroke and four-stroke cycles.
Merchant Navy CareersWhat 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.
Marine MachineryWhat is the difference between a two-stroke and a four-stroke marine engine?
Two-stroke and four-stroke marine engines differ in how many strokes complete a cycle, their speed and size, and the roles they play aboard ship.
Merchant Navy CareersWhat 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.
Marine MachineryWhat 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.
Merchant Navy CareersHow 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.
Merchant Navy CareersWhat 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.
Marine MachineryWhat is jacket cooling water in a marine engine?
Jacket cooling water is the treated fresh water circulated through the passages, or jackets, around an engine's cylinders to carry away combustion heat and keep it at its correct working temperature.
Marine MachineryWhat is scavenging in a two-stroke marine engine?
Scavenging is the process of pushing the burnt exhaust gases out of a two-stroke engine cylinder and replacing them with fresh air, ready for the next combustion cycle.
Marine MachineryWhat is a bearing and what types are used in marine engines?
A bearing supports and locates a rotating shaft while allowing it to turn with little friction — marine engines rely on plain white-metal bearings lubricated by an oil film.
Shipboard OperationsWhat is bridge resource management (BRM) and why does it matter?
Bridge resource management is the effective use of all the people, equipment and information available on the bridge to navigate safely, reduce human error and prevent accidents.
