360+ exam-style questions across all 8 MCA OOW 3000 GT syllabus modules. Filter by module and difficulty, study with explanations, or test yourself in Quiz Mode.
Under Rule 15, when two power-driven vessels are crossing so as to involve risk of collision, which vessel is the give-way vessel?
A vessel not under command shall exhibit which lights at night?
Under Rule 19, a vessel in restricted visibility hears a fog signal apparently forward of her beam. What action must she take?
Rule 5 requires every vessel to maintain a proper lookout using:
Which of the following is NOT a factor for determining safe speed under Rule 6?
A vessel is considered to be overtaking when approaching from a direction more than:
In a head-on situation, both vessels shall:
The give-way vessel shall take action that is:
The stand-on vessel shall NOT alter course to port when:
In the hierarchy of vessels under Rule 18, which vessel has the highest priority (must be kept clear of)?
In a narrow channel, a vessel shall keep:
When crossing a Traffic Separation Scheme, a vessel shall cross:
What does three short blasts on a vessel's whistle indicate?
A power-driven vessel making way through the water in restricted visibility shall sound:
A power-driven vessel underway but stopped and making no way sounds:
A power-driven vessel underway must exhibit:
A masthead light shows over an arc of:
A sternlight shows over an arc of:
What is the minimum visibility range for a masthead light on a vessel of 50m or more?
When towing, a vessel displays how many masthead lights if the tow length exceeds 200m?
A vessel engaged in trawling shall exhibit:
A vessel constrained by her draught may exhibit:
A vessel under 50m at anchor shall exhibit:
A 'prolonged blast' as defined in Rule 32 has a duration of:
The doubt or danger signal consists of:
Risk of collision shall be deemed to exist if:
Action taken to avoid collision shall NOT:
A vessel 'underway' means:
Which of the following is an example of a vessel 'restricted in her ability to manoeuvre'?
Two sailing vessels are approaching. Each has the wind on a different side. Which gives way?
A sailing vessel under 20m may exhibit:
A vessel engaged on pilotage duty exhibits:
The COLREGS apply to:
Rule 2 states that nothing in the Rules shall exonerate any vessel from:
Rules 11-18 (steering and sailing rules) apply when:
Navigation lights must be exhibited:
A vessel of 100m or more must carry:
To attract attention, a vessel may use:
Which of the following is a recognised distress signal under Annex IV?
In restricted visibility, a vessel detects another vessel on radar with a steady bearing. She should:
In restricted visibility, you may NOT alter course to port for:
The stand-on vessel may take action to avoid collision by her manoeuvre alone when:
A vessel restricted in her ability to manoeuvre must keep clear of:
Fishing vessels in a TSS:
In a narrow channel, a vessel under 20m in length shall:
When towing with a tow length exceeding 200m, a vessel shall exhibit by day:
A vessel restricted in her ability to manoeuvre, when making way, shall exhibit in addition to RAM lights:
A vessel at anchor in restricted visibility shall sound:
A power-driven vessel under 12m may exhibit instead of Rule 23 lights:
The overtaking vessel shall keep out of the way of the vessel being overtaken:
The four stages of passage planning are:
Sea Area A1 is defined as:
What is the international distress frequency for VHF DSC?
CPA stands for:
In True Motion radar display:
Variation is the angle between:
Deviation is caused by:
Spring tides occur at:
Using the Rule of Twelfths, in the third hour after high water, the tide falls by:
Soundings on Admiralty charts are given below:
AIS transmits vessel information including:
An ENC (Electronic Navigational Chart) differs from an RNC in that:
The main source of error in GPS positioning in coastal waters can be reduced by:
When calculating Under-Keel Clearance (UKC), which factor must be added to the vessel's draught?
Squat is most significant when:
The master should be called when:
An EPIRB transmits on:
The correct order of a MAYDAY call begins with:
In normal conditions, the recommended scope of cable when anchoring is:
When a pilot is on board:
NAVTEX broadcasts on:
A Voyage Data Recorder (VDR) is the maritime equivalent of:
In IALA Region A, port hand marks are:
A North Cardinal mark has:
An isolated danger mark has the light characteristic:
Bridge Resource Management (BRM) is primarily concerned with:
The most reliable coastal position fix uses:
Before taking over a navigational watch, the relieving officer must:
SOLAS requires steering gear to be tested before entering port:
'Advance' in ship manoeuvring is:
Bank suction effect causes a vessel to:
A storm surge is caused by:
The datum for heights of land features on Admiralty charts is:
When taking a sun sight, which corrections must be applied to the sextant altitude?
Sea Area A3 covers:
Upon receiving a distress signal, the first action is to:
When navigating at night, bridge lights should be:
A 'no-go area' in passage planning is:
Which equipment is required on vessels over 300 GT for collision avoidance?
In restricted visibility, you should NOT alter course to port for a vessel:
Neap tides occur when:
A safe water mark has:
Under STCW, the OOW must ensure:
'Transfer' in ship manoeuvring is:
A dragging anchor is detected by:
DSC distress alert is activated by:
The 'appraisal' stage of passage planning involves:
When routing to avoid heavy weather, the most important factor is:
The centre of buoyancy (B) is:
If the metacentre (M) is above the centre of gravity (G), the vessel is:
Free surface effect is caused by:
The correct action to correct angle of loll is:
IMO minimum stability criteria requires the GZ at 30° to be at least:
A vessel 'trimmed by the stern' means:
The Summer load line mark is indicated by:
Deadweight (DWT) is:
When cargo is loaded above the current centre of gravity:
A vessel with a large GM (stiff vessel) will have:
The International Grain Code requires the maximum angle of heel due to grain shift to not exceed:
Watertight integrity is maintained by:
The stability booklet must be:
A suspended weight (e.g., on a crane) acts as if its centre of gravity is:
MCT1cm (Moment to Change Trim 1cm) is used to calculate:
Parametric rolling is most likely to occur when:
The inclining experiment formula is:
The righting lever (GZ) is:
The angle of maximum GZ must be at least:
Reserve buoyancy is:
Fresh Water Allowance (FWA) is calculated as:
TPC (Tonnes Per Centimetre) is used to calculate:
In the lost buoyancy method of damage stability calculation:
The effect of beam on stability is:
Negative stability (negative GM) results in:
A vessel has displacement 4000t, KG 5.5m, KM 6.2m. 100t is loaded at KG 8m. The new GM is approximately:
When ballasting double bottom tanks, the free surface effect:
Dynamic stability is measured by:
The relationship between KG, KM, and GM is:
Ice accumulation on the upper works of a vessel:
The centre of flotation (F) is:
A vessel with a very small GM (tender vessel) will:
The area under the GZ curve from 0° to 30° must be at least:
The angle of vanishing stability (AVS) is:
The effect of shifting cargo from lower hold to upper deck is:
A vessel has a list of 3° to starboard. To correct this list, you should:
The B1M line on a GZ curve represents:
Dock Water Allowance (DWA) is applied when:
Reserve buoyancy is represented by:
In a flooding scenario, the free surface of the flooding water:
KM (height of metacentre above keel) is found from:
The effect of free surfaces on the GZ curve is to:
The inclining experiment is required:
A loading computer on board is used to:
Initial stability refers to:
In the Northern Hemisphere, winds around a low pressure system circulate:
The first cloud type to appear as a warm front approaches is:
After the passage of a cold front, the temperature:
Tropical cyclones form over ocean areas where the sea surface temperature is:
In the Northern Hemisphere, if the wind is backing as a tropical cyclone approaches, you are in:
Beaufort Force 8 (Gale) has wind speeds of:
Advection fog forms when:
Buys Ballot's Law states that in the Northern Hemisphere, if you stand with your back to the wind:
The eye of a tropical cyclone is characterised by:
A rapidly falling barometer (more than 3 mb in 3 hours) indicates:
Cumulonimbus clouds are associated with:
A storm surge is most dangerous in:
In the dangerous semicircle of a tropical cyclone (NH), the recommended action is:
Swell differs from sea (wind waves) in that:
When navigating in ice, which precaution is most important?
The Inter-Tropical Convergence Zone (ITCZ) is characterised by:
A sea breeze occurs:
Tropical cyclones do NOT form within:
NAVTEX provides mariners with:
Restricted visibility is defined as visibility restricted by:
An occluded front forms when:
The Coriolis effect in the Northern Hemisphere deflects moving air:
In the Northern Hemisphere, trade winds blow from the:
Closely spaced isobars on a synoptic chart indicate:
Recurvature of a tropical cyclone refers to:
WMO sea state 6 (very rough) has wave heights of:
A katabatic wind is:
Steam fog (Arctic sea smoke) forms when:
A rapidly deepening depression (bomb cyclogenesis) is defined as:
A veering wind changes direction:
A backing wind changes direction:
Sea fog is most likely to form when:
The dew point temperature is:
The North Atlantic tropical cyclone season is:
An anticyclone (high pressure) is associated with:
The Saffir-Simpson scale classifies:
SafetyNET broadcasts are received via:
An occluded front is associated with:
A secondary depression typically forms:
The geostrophic wind blows:
A tropical depression has sustained winds of:
Radiation fog typically forms:
Parametric rolling is most likely to occur in:
GRIB data files are used for:
A col (saddle point) is characterised by:
The primary principle of cargo stowage is:
The IMDG Code classifies dangerous goods into:
A 20-foot equivalent unit (TEU) is:
The IMSBC Code applies to:
Stowage factor is defined as:
The flashpoint of a flammable liquid determines:
The carriage temperature for frozen cargo is typically:
The Cargo Securing Manual (CSM) is required by:
Grain cargo is particularly hazardous because:
A cargo that may liquefy is classified under IMSBC Code as:
Before loading cargo, the officer should:
Segregation of dangerous goods means:
Broken stowage is:
A Bay Plan (or Stowage Plan) for containers shows:
The Transportable Moisture Limit (TML) of a bulk cargo is:
IMDG Class 1 covers:
A Notice of Readiness (NOR) is:
Lashing calculations for cargo securing must account for:
Angle of repose of a bulk cargo is:
A Material Safety Data Sheet (MSDS/SDS) provides:
Controlled atmosphere (CA) storage for fruit cargo involves:
A Bill of Lading (B/L) is:
Stack weight limits on container vessels are imposed to:
Coal cargo presents which primary hazards?
A Mate's Receipt is:
The Emergency Schedule (EmS) in the IMDG Code provides:
Deadfreight occurs when:
The Code of Safe Practice for Cargo Stowage and Securing (CSS Code) is published by:
Before loading a bulk cargo that may liquefy, the shipper must provide:
The purpose of a cargo manifest is:
IMDG Class 3 covers:
A reefer container requires:
Cargo sweat occurs when:
The Flow Moisture Point (FMP) of a bulk cargo is:
The maximum securing load (MSL) of a lashing is:
Ventilation of cargo holds is important to:
A Dangerous Goods Declaration must be provided by:
Dunnage is used in cargo operations to:
Ore cargoes are characterised by:
An out-of-gauge (OOG) cargo is:
A Ship's Manifest differs from a Bill of Lading in that:
The Emergency Response Procedures for Ships Carrying Dangerous Goods (EmS) fire schedule provides:
The purpose of a pre-loading survey is:
Bauxite cargo presents which specific hazard?
Lashing angle affects securing efficiency because:
Under SOLAS, lifeboat drills must be held at intervals of:
The three elements of the fire triangle are:
The immediate action when a person falls overboard is:
The ISM Code requires vessels to have:
A MAYDAY call indicates:
A CO2 fixed fire-fighting system is most suitable for:
A liferaft must be capable of being launched:
MARPOL Annex I covers:
The Oil Record Book Part I (Machinery Space Operations) must be retained for:
In the event of a collision, the immediate priorities are:
The correct fire-fighting agent for a Class B fire (flammable liquids) is:
An immersion suit (survival suit) is designed to:
The muster list (station bill) must show:
The Williamson Turn is used for:
When a vessel runs aground, the immediate actions include:
A fire in the engine room is detected. What is the correct sequence of actions?
MARPOL Annex V covers:
What does GMDSS stand for?
VHF Channel 16 is used for:
A DSC distress alert automatically includes:
An EPIRB should be registered with:
A SART (Search and Rescue Transponder) operates on:
The international distress frequency on MF is:
Inmarsat provides communications via:
NAVTEX messages are identified by:
The phonetic alphabet for the letter 'M' is:
Sea Area A2 is defined as:
The Radio Log must record:
A PAN-PAN call indicates:
A SECURITE call is used for:
The GMDSS requires vessels to be able to:
HF (High Frequency) radio is used for:
After sending a DSC distress alert, you should:
An MMSI (Maritime Mobile Service Identity) is:
A GMDSS radio operator must hold:
AIS Class A transponders are required on:
VDR data is protected in a float-free capsule that must withstand:
The purpose of the GMDSS watchkeeping requirement is:
A two-way VHF portable radio for survival craft must:
The GMDSS battery backup must provide power for:
VHF Channel 6 is used for:
The COSPAS-SARSAT system uses:
When calling another vessel on VHF, you should:
A vessel in Sea Area A3 must carry:
OVER in radio communications means:
ROGER in radio communications means:
The GMDSS functional requirement for 'locating signals' is fulfilled by:
The maximum VHF transmitter power is:
An EPIRB hydrostatic release activates at a depth of:
The purpose of the GMDSS radio equipment test is:
How many SARTs must be carried on SOLAS vessels?
MAYDAY RELAY is used when:
The GMDSS maintenance requirement allows:
AIS static information includes:
When acknowledging a MAYDAY, the correct response begins with:
The GMDSS requires vessels to maintain watch on DSC:
The phonetic alphabet for 'SOS' is:
Port operations VHF channels are typically:
The purpose of a DSC test call is:
When should you cancel a false MAYDAY alert?
Inmarsat-C provides:
The correct way to give a position in a MAYDAY is:
The keel is:
Frames in ship construction are:
A collision bulkhead is required:
The purpose of the double bottom is:
Longitudinal framing is preferred over transverse framing because:
The purpose of the bilge system is:
Hogging occurs when:
Sagging occurs when:
A two-stroke diesel engine fires:
The gunwale is:
The purpose of the sea chest is:
The neutral axis of a ship's cross-section is:
A controllable pitch propeller (CPP) allows:
The freeboard of a vessel is:
The purpose of the bow thruster is:
Camber in ship construction refers to:
A turbocharger on a diesel engine:
The stern post is:
The purpose of the anchor windlass is:
Sheer in ship construction is:
The purpose of the stern tube is:
The purpose of watertight bulkheads is:
The purpose of the exhaust gas economiser (waste heat recovery) is:
The purpose of the bilge keel is:
The purpose of the ballast system is:
The section modulus of a ship's hull is used to calculate:
A fixed pitch propeller (FPP) compared to a CPP:
The purpose of the anchor cable (chain) is:
The purpose of the bilge alarm is:
The purpose of the forecastle (fo'c'sle) is:
A vessel's stopping distance depends on:
The purpose of the poop deck is:
Cavitation on a propeller occurs when:
Freeboard marks on a vessel indicate:
The purpose of the emergency generator is:
The purpose of the cofferdam is:
The purpose of the rudder is:
The purpose of the intercostal plate is:
The purpose of the inert gas system (IGS) on tankers is:
The purpose of the chain locker is:
The purpose of the sewage treatment plant (STP) is:
The purpose of the Panama Canal fittings is:
The purpose of the oily water separator (OWS) is:
Fatigue cracking in ship structures is caused by:
The purpose of the fuel oil purifier (centrifuge) is:
Under Rule 13, when is a vessel considered to be overtaking?
What lights must a vessel not under command show at night?
What is the day signal for a vessel constrained by her draught?
What does one prolonged blast on the whistle mean when leaving a berth?
Under Rule 10, what must a vessel do if she is obliged to cross a traffic lane?
What lights does a pilot vessel on duty show?
What is the minimum range of a masthead light for a vessel 50-150m in length?
Under Rule 18, which vessel has the lowest priority (must give way to all others)?
What signal does a vessel at anchor sound in restricted visibility?
What does Rule 17 say about the stand-on vessel?
What is the arc of visibility for a stern light?
What lights does a vessel towing show when the tow exceeds 200m?
Under Rule 9, what must a vessel do in a narrow channel?
What is the definition of 'safe speed' under Rule 6?
What lights does a vessel engaged in fishing (not trawling) show?
What does a vessel show when aground?
Under Rule 14, when do two power-driven vessels meet head-on?
What is the purpose of Rule 2 (Responsibility)?
What is the arc of visibility for sidelights?
What action should a vessel take when she hears five or more short blasts?
Under Rule 10, what must a vessel NOT do in a TSS?
What does a black cylinder displayed by day indicate?
Under Rule 19, what action should a vessel take in restricted visibility when she hears a fog signal forward of her beam?
What is the minimum visibility range for sidelights on a vessel 12-50m in length?
What does Rule 5 require?
What is the purpose of a passage plan?
What is the difference between magnetic variation and deviation?
What is a safe water mark?
What is the formula for calculating ETA?
What is the purpose of a gyrocompass?
What is a lateral mark in IALA Region A?
What is the purpose of a running fix?
What is the difference between a transit bearing and a clearing bearing?
What is the purpose of a watch handover?
What is the ARPA?
What is the difference between relative and true motion on radar?
What is the purpose of a chart datum?
What is the difference between COG and HDG?
What is the purpose of a Notice to Mariners?
What is leeway?
What is the purpose of a position fix?
What is the purpose of a tidal stream atlas?
What is the purpose of a depth sounder (echo sounder)?
What is the purpose of the ECDIS?
What is the metacentric height (GM)?
What is the free surface effect?
What is the difference between a stiff and a tender vessel?
What is the angle of loll?
How do you correct a vessel at the angle of loll?
What is displacement?
What is the purpose of a stability booklet?
What is the GZ curve?
What is the effect of adding weight above the centre of gravity?
What is the purpose of a damage stability calculation?
What is the lost buoyancy method for damage stability?
What is freeboard?
What is the purpose of a load line?
What is the Beaufort Scale?
What is the Buys Ballot's Law?
What is a cold front?
What is the difference between weather and climate?
What is the eye of a tropical cyclone?
What is a synoptic chart?
What is the significance of a rapidly falling barometer?
What is the dangerous semicircle of a tropical cyclone in the Northern Hemisphere?
What is a sea breeze?
What is the ITCZ?
What is a katabatic wind?
What does the term 'veering' mean in relation to wind direction?
What is the purpose of a cargo plan?
What is the significance of the stowage factor?
What is a dangerous goods manifest?
What is the purpose of securing cargo?
What is the IMDG Code?
What is the purpose of dunnage?
What is the purpose of a mates receipt?
What is the angle of repose for bulk cargo?
What is the purpose of a bill of lading?
What is cargo segregation?
What is the purpose of a muster list?
What is the SOLAS requirement for lifeboat drills?
What is the purpose of an EPIRB?
What is the procedure for a man overboard?
What is the purpose of a fire damper?
What is the purpose of a fire patrol?
What is the purpose of a CO2 fixed fire fighting system?
What is the purpose of a SART?
What is the purpose of a lifebuoy light?
What is the purpose of a survival craft painter?
What is the purpose of a hydrostatic release unit (HRU) on a liferaft?
What is the purpose of a distress flare?
What is the purpose of the GMDSS?
What is the purpose of a DSC controller?
What is Channel 16 used for?
What is the MMSI number?
What is the difference between MAYDAY, PAN PAN, and SECURITE?
What is the purpose of NAVTEX?
What is the purpose of an Inmarsat system?
What is the purpose of a SOLAS Sea Area A1?
What is the phonetic alphabet letter for 'M'?
What is the purpose of a ship's log book?
What is the purpose of the International Code of Signals?
What is the purpose of a double bottom?
What is the purpose of a watertight bulkhead?
What is the purpose of a bilge system?
What is the purpose of a cofferdam?
What is the purpose of a transverse frame?
What is the keel?
What is the purpose of a sea chest?
What is the purpose of a stern tube?
What is the purpose of an anchor windlass?
What is the purpose of a rudder?
What is the purpose of a bow thruster?
What is the purpose of a mooring winch?
What is the arc of visibility of a masthead light?
What does a vessel show when she is restricted in her ability to manoeuvre?
Under Rule 16, what must the give-way vessel do?
What is the minimum height of a masthead light above the hull for a vessel 20-50m in length?
What does the term 'underway' mean in the COLREGS?
What lights must a vessel under oars show?
Under Rule 10, what must a vessel do if she cannot safely navigate in a traffic separation zone?
What is the sound signal for a vessel at anchor in restricted visibility?
What is the purpose of Rule 36?
What is the difference between a power-driven vessel and a vessel under sail?
What is the purpose of a compass adjustment?
What is the purpose of a deviation card?
What is the purpose of a waypoint?
What is the purpose of a parallel index technique?
What is the purpose of a celestial fix?
What is the purpose of a fog signal?
What is the purpose of a pilot card?
What is the purpose of a wheel-over point?
What is the purpose of a chart correction?
What is the purpose of a track plot?
What is the purpose of a deadweight scale?
What is the purpose of a trim calculation?
What is the purpose of a bilge keel?
What is the purpose of a tank sounding?
What is the purpose of a stability criterion?
What is the purpose of a ballast tank?
What is the effect of a low KG on stability?
What is the purpose of a cross-flooding arrangement?
What is the purpose of a load line zone?
What is the purpose of a weather routing service?
What is the purpose of a pilot chart?
What is the purpose of a weather fax?
What is the significance of a warm front?
What is the purpose of a radiosonde?
What is a squall?
What is the purpose of a weather observation?
What is the Saffir-Simpson scale?
What is the purpose of a cargo manifest?
What is the purpose of a pre-loading survey?
What is the purpose of a cargo net?
What is the purpose of a tally?
What is the purpose of a cargo securing manual?
What is the purpose of a hatch cover?
What is the purpose of a pre-arrival notice?
What is the purpose of a cargo ventilation plan?
What is the purpose of a safety management system (SMS)?
What is the purpose of the ISM Code?
What is the purpose of a personal locator beacon (PLB)?
What is the purpose of a fire detection system?
What is the purpose of a fixed gas detection system?
What is the purpose of a lifeboat drill?
What is the purpose of a rescue boat?
What is the purpose of a thermal protective aid (TPA)?
What is the purpose of a VHF radio watch?
What is the purpose of a GMDSS radio log?
What is the phonetic alphabet for 'S'?
What is the purpose of a port state control inspection?
What is the purpose of the LRIT system?
What is the purpose of AIS?
What is the purpose of a ship's radio licence?
What is the purpose of a collision bulkhead?
What is the purpose of a frame spacing?
What is the purpose of a hawse pipe?
What is the purpose of a chain locker?
What is the purpose of a shaft tunnel?
What is the purpose of a scupper?
What is the purpose of a thruster tunnel?
What is the purpose of a sacrificial anode?
What is the purpose of a dry dock?
What is the purpose of a freeing port?
What is the purpose of a sea valve?
What is the purpose of a gangway?
What is the purpose of a watertight door?
What is the purpose of a longitudinal framing system?
What is the purpose of a vessel's classification society?