The topics competency exams ask most, each in a few slides. Ranked by how often they come up.

Weather Fronts at Sea: Warm, Cold and Occluded Fronts Explained
Asked 107× in exams

MLC 2006 Legal Structure — Articles, Regulations, Standards & Guidelines
Asked 104× in exams

Fixed CO₂ Fire Extinguishing System – Principles, Components & Safe Operation
Asked 101× in exams

MARPOL Annex I & V Compliance Essentials
Asked 96× in exams

Emergency Switchboard Mandatory Circuits
Asked 95× in exams

Double hull oil tanker midship section: MARPOL wing tank and double bottom requirements
Asked 91× in exams

Port State Control (PSC) Objectives, Functions & Master’s Preparation
Asked 90× in exams

MARPOL Annex I vs Annex V — Records, Certificates & PSC Hotspots
Asked 89× in exams

ISM Code & EEZ
Asked 87× in exams

Global Warming’s Impact on Ocean Currents and Weather Patterns
Asked 81× in exams

Waveform, frequency & average value
Asked 72× in exams

Boiler safety valves on ships: how many are required, how they are set, accumulation test and surveys
Asked 69× in exams

Marine Insurance Losses & General Average
Asked 66× in exams

Constructive Total Loss (CTL) & General Average Explained
Asked 65× in exams

Grain Code stability criteria: heel, area and GM
Asked 64× in exams

Deck Cargo Precautions and Effects of Heavy Lifts on Ship Stability
Asked 64× in exams

Cylinder Lubrication & Liner Wear
Asked 64× in exams

Liquefied Gas Cargoes & IGC Code
Asked 64× in exams

Heavy lift operations using ship’s gear
Asked 62× in exams

Enclosed space entry on ships: what counts as one, gas testing limits and precautions before entry
Asked 60× in exams

Charter Party, Freight, Bill of Lading, Laytime and Demurrage Explained for Seafarers
Asked 59× in exams

Electrical machinery condition monitoring
Asked 57× in exams

Freeboard & Conditions of Assignment
Asked 57× in exams

Buys Ballot’s Law, Geostrophic Wind & Weather Chart Interpretation
Asked 56× in exams

Ship hull protection & antifouling
Asked 55× in exams

ISPS Code roles & responsibilities
Asked 55× in exams

ISM code & SMS
Asked 52× in exams

Safe Entry into Fuel Oil Storage Tanks – Isolation, Ventilation & Atmosphere Testing
Asked 50× in exams

IGC Code Fundamentals
Asked 50× in exams

Inclining test & ship stability
Asked 50× in exams

LRIT & AIS
Asked 49× in exams

Electrochemical Reactions & Cathodic Protection Made Simple
Asked 48× in exams

Marine Casualties, Ship Registration & IMO Amendments
Asked 48× in exams

AC Generator Reverse Power Protection & Motoring Condition Explained
Asked 47× in exams

Ring Main System, Static Accumulation & Deck Seal Unit
Asked 47× in exams

Gyro Compass Precession, Apparent Wander & Settling Time Explained
Asked 47× in exams

DG Segregation Codes, DG Manifest & MFAG/EmS
Asked 47× in exams

Marine Refrigeration Fault Diagnosis & Corrective Actions
Asked 45× in exams

Flue Gas Inerting System vs Dedicated IG Generator Explained
Asked 45× in exams

Fatigue Cracking in Marine Engine Components — From Micro-Crack to Catastrophic Failure
Asked 45× in exams

Anchor dragging & emergency actions
Asked 45× in exams

PSCO selection, powers & the PSC inspection framework
Asked 45× in exams

ISM Code Clauses 9 and 12: Incident Reporting, Internal Audits and Ice Navigation
Asked 44× in exams

EM Log vs Doppler Log
Asked 44× in exams

IMDG Dangerous Goods Classification, Packing & Labelling Essentials
Asked 44× in exams

Main engine vibration: causes, consequences & investigation
Asked 42× in exams

Ballast water management & bwms
Asked 42× in exams

Ship Heel During Turning Explained
Asked 42× in exams

Fatigue Cracking in Marine Diesel Engine Bedplate Transverse Girders: Causes and Prevention
Asked 41× in exams

Ship Hull Corrosion Protection (Coatings & Cathodic Protection)
Asked 41× in exams

HSSC vs CAS Explained
Asked 40× in exams

Timber Deck Cargo & Securing
Asked 39× in exams

Assertive Leadership, Teamwork & Safe Ship Operations
Asked 39× in exams

Hague–Visby Rules & Maritime Liens
Asked 39× in exams

Electrochemical Reactions & Galvanic Corrosion Explained
Asked 38× in exams

Ship Registration & Flag State Duties
Asked 38× in exams

MLC inspection preparation
Asked 37× in exams

Lloyd’s Open Form (LOF) 2000 and 2011 Explained: No Cure, No Pay, SCOPIC and Arbitration
Asked 36× in exams

Marine Fuel Quality Parameters
Asked 36× in exams

Alternator Synchronization Before Closing the Breaker
Asked 36× in exams

Vessel Behaviour in Heavy Weather
Asked 36× in exams

Interpreting Fe, Cu, Sn, Sb & Si Trends in Marine Lube Oil Analysis
Asked 35× in exams

Vessel Traffic Services (VTS)
Asked 35× in exams

Master’s Duties After Collision & Maritime Incidents
Asked 34× in exams

Creep in metals
Asked 33× in exams

Aneroid barometer & pressure corrections
Asked 33× in exams

Flag State Control vs Port State Control
Asked 33× in exams

Ozone-depleting substances on ships under MARPOL Annex VI
Asked 32× in exams

Polar navigation
Asked 32× in exams

Deep Draft Vessel Anchoring in a Crowded Anchorage
Asked 32× in exams

Marine Insurance Principles & Warranties
Asked 32× in exams

Synchronising Alternators – 4 Conditions
Asked 31× in exams

Hatch cover weathertightness: tests and leak action
Asked 30× in exams

Steering gear mastery
Asked 30× in exams

Shipbuilding steel tests
Asked 30× in exams

Essential hull structural stresses
Asked 30× in exams

Marine Protective Coating Systems
Asked 29× in exams

Constructive Total Loss & General Average Adjuster
Asked 29× in exams

Factors Affecting a Ship’s Rolling Period
Asked 27× in exams

Container types & cargo suitability
Asked 27× in exams

Boiler Water Testing, Treatment & Boiler Reliability
Asked 27× in exams

Hull Surface Preparation & Coating Systems
Asked 26× in exams

Transverse vs longitudinal framing
Asked 26× in exams

Master–Pilot Information Exchange (MPX) & VTS Essentials
Asked 26× in exams

Floodable Length, Permissible Length & Permeability Explained
Asked 26× in exams

Sewage Tank Entry Procedures, Gas Testing & Permit-to-Work Requirements
Asked 26× in exams

General average & fund convention
Asked 26× in exams

5-Step PSC Observation Closure Procedure
Asked 26× in exams

Ballast Water Exchange: IMO Rules, Methods & Safe Operations
Asked 25× in exams

Marine Insurance Fundamentals
Asked 25× in exams

Lube Oil Analysis Wear Metals & Insolubles
Asked 24× in exams

Bridge Procedures Guide
Asked 24× in exams

Enhanced Survey Programme (ESP) Explained
Asked 23× in exams

MARPOL Annex VI — NOx & SOx Limits
Asked 22× in exams

LNG Fuel System on Ships — From Bunkering to Combustion
Asked 22× in exams

Air Masses & Marine Weather
Asked 22× in exams

The Three Pillars of Safe Shipping
Asked 22× in exams

GPS errors & ECDIS essentials
Asked 21× in exams

Classification Societies & Maritime Safety
Asked 21× in exams

IAMSAR Volume III Search Patterns
Asked 21× in exams

Nairobi Convention (WRC 2007) & Merchant Shipping Act, 2025
Asked 21× in exams

Indian Ship Registration Under the Merchant Shipping Act, 2025
Asked 21× in exams

Crude Oil Washing (COW)
Asked 20× in exams

Bridge Resource Management (BRM) & Situational Awareness (SA)
Asked 20× in exams

ISPS Code: SSA, SSP & amendments
Asked 20× in exams

Intrinsic Safety (Ex i) — Principle, Applications & Live Work Rules on Ships
Asked 19× in exams

Types of Liquefied Gas Carriers
Asked 19× in exams

Port State Control (PSC) & Ship Security Plan (SSP)
Asked 19× in exams

General Average (York-Antwerp Rules)
Asked 19× in exams

Engine room essentials
Asked 18× in exams

Hatch Cover Maintenance & Weathertightness Testing
Asked 18× in exams

Situational Leadership and Multicultural Crew Management on Ships
Asked 15× in exams

IMDG Cargo Segregation Levels
Asked 15× in exams

Emergency Towing & ETB Requirements
Asked 15× in exams

Class & load line essentials
Asked 14× in exams

MARPOL Bunkering Operations
Asked 14× in exams

Maritime Fog Types
Asked 14× in exams

Hot Work Inside Cargo Tanks – Risk Assessment, Hazards & Control Measures
Asked 14× in exams

Bill of Lading Functions
Asked 14× in exams

Official log book & misconduct (UK)
Asked 14× in exams

Marine Fuel Viscosity: Measurement, Control & Engine Protection
Asked 13× in exams

DOC, SMC, DOS & CSR: the difference
Asked 13× in exams

Precautions for Navigating in Ice Regions
Asked 13× in exams

Creep, Brinelling, Fretting & Fretting Corrosion
Asked 12× in exams

Working Overside & Aloft Safety
Asked 12× in exams

Collision at sea
Asked 12× in exams

IMSBC Code vs BLU Code
Asked 12× in exams

Close-Up Surveys, Critical Structural Areas and CAS Explained
Asked 12× in exams

SCOPIC Clause, CLC & Fund Convention Explained
Asked 12× in exams

Safety Committee & Permit to Work (PTW) — The Backbone of Shipboard Safety
Asked 11× in exams

Marine Lube Oil Analysis
Asked 10× in exams

Advection Fog vs Radiation Fog & Hoar Frost vs Rime — Know the Differences
Asked 10× in exams

Ship Blackout at Full Ahead: Immediate Actions, Power Restoration and Propulsion Recovery
Asked 9× in exams

Class Certification and Load Line Surveys Made Simple
Asked 9× in exams

Essential Safe Navigation Publications & IAMSAR Manual
Asked 9× in exams

Bridge Team & Pilot Responsibilities During Pilotage
Asked 9× in exams

Enclosed vs Excluded Spaces
Asked 9× in exams

Situational leadership on board
Asked 8× in exams

Contingency Approach to Leadership
Asked 8× in exams

Material Toughness & Aluminium to Steel Connections
Asked 8× in exams

Polar code
Asked 8× in exams

P&I Clubs & Oil Pollution Compensation Explained
Asked 8× in exams

Losses in a Squirrel-Cage Induction Motor
Asked 7× in exams

Fog at sea
Asked 7× in exams

Electronic record books (ERB) under MARPOL
Asked 7× in exams

Dpa, master & resource management
Asked 7× in exams

Engine & Fuel System Essentials
Asked 7× in exams

Ship Weather Routeing
Asked 7× in exams

Maritime Surveys & Statutory Certificates
Asked 6× in exams

Coswp 2026 & safe working practices
Asked 6× in exams

Sole Lookout Under STCW
Asked 6× in exams

Corrosion prevention & pms
Asked 6× in exams

Certificate of Fitness & LNG Loading Sequence
Asked 6× in exams

Parametric Rolling vs Synchronous Rolling & Emergency Towing
Asked 6× in exams

4 Core Principles of the IMO Casualty Investigation Code
Asked 6× in exams

Marine Boiler Feedwater Demand Increasing at Constant Steam Load: Causes and Troubleshooting
Asked 5× in exams

Marine Weather Terms
Asked 5× in exams

LNG cargo operations
Asked 5× in exams

General Average vs Particular Average
Asked 5× in exams

ILO Convention 98 & 108
Asked 5× in exams

Ice navigation & master–pilot relationship
Asked 5× in exams

Master–Pilot Exchange & Safe Navigation in Pack Ice
Asked 5× in exams

Master’s Duties Under SOLAS Chapter V & ISM Code
Asked 5× in exams

Marine Two-Stroke SCR Systems: HPSCR vs LPSCR, Static Mixers and Tier III NOx Control

Cast iron welding & repair methods

Sea vs Swell, Mist vs Fog & Coastal Weather Bulletin

Marine Coating Systems — Chlorinated Rubber vs Epoxy vs Polyurethane
N-Type, P-Type & PN Junctions — The Semiconductor Topic

Bulk Fertilizers: Hazards, IMSBC Requirements & Safe Carriage

Polar Code, Ice Class & Polar Service Temperature (PST)

Vessel Traffic Services (VTS) & Collision Prevention in TSS

The surface circulation: north atlantic

Master's Responsibilities During Pilotage

Iron Ore Fines Sampling & Liquefaction

Ro-Ro Shell Door Safety Systems, SOLAS Compliance & Bridge Monitoring

Stowaway Cases & the Master’s Response

Shipper’s Obligations & Damage Stability

Stowaway Prevention, Management & Reporting

Marine Insurance & Charter Party Clauses

Emergency Stopping & Berthing of Large Vessels

Total Quality Management (TQM) in the Maritime Industry: Principles and Shipboard Applications

FSS code: type b foam fire test

Corrosion in Auxiliary Boilers — Causes, Warning Signs & Prevention

Man Overboard (MOB) & Grounding Immediate Actions

Deterministic vs Probabilistic Damage Stability

Clear Grounds” Under SOLAS XI-2 & ISPS Code — Know What Triggers a Security Inspection

EU ETS vs FuelEU Maritime: Green Shipping Corridors and Decarbonisation Costs

New Bunker vs Existing Fuel

GMDSS essentials: EPIRB, SART & survival equipment

CDP Selection, Prewash Requirements & Annex II Compliance

Leadership & Hot Work Safety on Tankers

Dangerous goods segregation & manifest

Anchoring & Ship-to-Ship (STS) Operations
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