Maritime Knowledge Base
Browse questions and answers across marine machinery, merchant navy careers, shipboard operations and maritime glossary terms.
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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 "Stability"
What causes a marine engine turbocharger to surge?
Turbocharger surging is a violent, audible instability of the airflow through the compressor — it signals a mismatch between the turbocharger and the engine's demand.
Shipboard OperationsWhat precautions does a ship take in heavy weather?
In heavy weather a ship reduces speed and adjusts course to ease its motion, secures everything for sea, manages ballast and stability, and guards against dangerous rolling.
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.
Maritime GlossaryWhat is deadweight tonnage (DWT)?
Deadweight tonnage defined — the total weight a ship can carry — and how it differs from displacement and gross tonnage.
Maritime GlossaryWhat is a TEU?
TEU explained — the twenty-foot equivalent unit used to measure container-ship capacity and container throughput.
Maritime GlossaryWhat is SOLAS?
SOLAS explained — the IMO's most important safety convention and the areas of ship safety it governs.
Maritime GlossaryWhat 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.
Merchant Navy CareersHow 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.
Marine MachineryWhy does the auxiliary boiler flame keep failing or the burner keep tripping?
Repeated boiler flame failure trips the burner on the flame monitor — the causes run through the fuel, the ignition, the air and the flame-detection system.
Merchant Navy CareersWhat 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.
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.
Shipboard OperationsHow is cargo secured and lashed on a ship?
Cargo is secured against the forces of the ship's motion using lashings, twistlocks and dunnage, in accordance with the ship's approved Cargo Securing Manual.
Shipboard OperationsWhat is a draught survey and how is cargo weight calculated?
A draught survey determines the weight of bulk cargo loaded or discharged by measuring the ship's draughts and calculating the change in its displacement.
Merchant Navy CareersWhat 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.
Shipboard OperationsHow is ballast water managed and treated on board a ship?
Under the Ballast Water Management Convention, ships manage ballast water either by mid-ocean exchange or, increasingly, by treating it through an approved system before discharge.
