I85PREP
⌘ K
Ghana Maritime Authority Master Mariner CoC foundations study materials
Ghana Maritime Authority Master Mariner CoC foundations study resources

Ghana Maritime Authority Master Mariner CoC foundations practice questions

One question at a time. Build your Ghana Maritime Authority Master Mariner CoC foundations understanding.

First 50 of 190 questions. Each one lists the choices, the correct answer, and an explanation. The checker at the top of this page saves progress in this browser when it is available.

Continue in the practice tool above to load more questions, 50 at a time.

Question 1Maritime Law

Under the Ghana Shipping Act, 2003 (Act 645), what is the statutory requirement for the registration of Ghanaian ships?

  1. Only ships owned by the Government of Ghana can be registered.
  2. Every Ghanaian ship, unless exempted, must be registered in the Register of Ghanaian Ships maintained by the Ghana Maritime Authority. Correct answer.
  3. Registration is voluntary and is only required for ships traveling to European ports.
  4. Registration is handled by the local port security office.

Explanation

The Ghana Shipping Act, 2003 (Act 645) mandates that every ship owned by a Ghanaian citizen or a body corporate established under the laws of Ghana, which operates in Ghanaian waters or flies the Ghanaian flag, must be registered. The Register of Ghanaian Ships is maintained by the Registrar of Ships at the Ghana Maritime Authority (GMA). Exemptions may apply to small local vessels, which are subject to licensing instead.

Question 2Cargo Operations

Which of the following is a primary duty of the Master under the ISM Code regarding cargo operations?

  1. To personally tally every cargo container loaded onboard.
  2. To ensure that cargo operations are conducted in accordance with the ship's Safety Management System (SMS) and that all cargo hazards are identified and controlled. Correct answer.
  3. To modify the vessel's cargo capacity without consulting the Classification Society.
  4. To delegate all cargo safety responsibilities to the charterer.

Explanation

Under the International Safety Management (ISM) Code, the Master has the overriding authority and responsibility to make decisions with respect to safety and pollution prevention. Regarding cargo operations, the Master must ensure that the procedures detailed in the Safety Management System (SMS) are followed, that risk assessments are carried out for hazardous operations, and that the crew is properly supervised to prevent accidents and cargo damage.

Question 3Ship Operations

What is the primary action a Master should take immediately following a collision with another vessel?

  1. Order full speed ahead to push the other vessel out of the way.
  2. Check the safety of own crew, assess damage, and, so far as she can do so without serious danger to own vessel, render assistance to the other vessel. Correct answer.
  3. Contact the ship's insurance brokers to file a claim before checking for leaks.
  4. Instruct the crew to dump cargo overboard to reduce displacement.

Explanation

According to international maritime law (including the Brussels Collision Convention and national shipping acts like the Ghana Shipping Act), the Master of each vessel in a collision is legally obligated to render assistance to the other vessel, her crew, and her passengers, provided it does not place his own ship or crew in serious danger. The Master must also exchange vessel names, ports of registry, and destination ports.

Question 4Marine Navigation

When planning a Great Circle track, what is the significance of the 'vertex'?

  1. It is the point where the track crosses the equator at right angles.
  2. It is the point of maximum latitude reached by the Great Circle track, where the course is exactly 090° or 270°. Correct answer.
  3. It is the point of intersection between the Great Circle track and the rhumb line track.
  4. It is the position on the track where the ship is closest to the nearest navigational hazard.

Explanation

The vertex of a Great Circle track is the point where the track reaches its highest latitude (closest to the pole). At this point, the track's course is exactly 90° (due East) or 270° (due West). Understanding the position of the vertex is critical for determining if the track passes through high latitudes that may be hazardous due to ice, poor weather, or load line regulations, which might necessitate composite sailing.

Question 5Marine Navigation

You observe the azimuth of a star by the ship's standard magnetic compass as 085° Compass (C), and the true azimuth is calculated to be 082° True (T). If the variation is 5° West, what is the magnetic deviation of the compass?

  1. 2° West
  2. 8° East
  3. 2° East Correct answer.
  4. 8° West

Explanation

First, find the Compass Error: Compass Error = True Azimuth - Compass Azimuth = 082° T - 085° C = -3°, i.e. 3° West. Compass Error = Variation + Deviation. Thus -3° (W) = -5° (W) + Deviation, so Deviation = -3° - (-5°) = +2°, i.e. 2° East. (Note: variation and deviation combine only for a magnetic compass; a gyrocompass has a single gyro error instead.)

Question 6Marine Navigation

When adjusting a magnetic compass, which coefficient is corrected by horizontal magnets placed athwartships in the compass binnacle?

  1. Coefficient A
  2. Coefficient B
  3. Coefficient C Correct answer.
  4. Coefficient D

Explanation

Coefficient C represents semicircular deviation caused by the ship's permanent athwartship magnetic field. It is corrected by placing horizontal magnets in the athwartship (port-starboard) chambers of the binnacle. Coefficient B is corrected by fore-and-aft magnets, and Coefficient D is corrected by soft iron spheres (quadrantal correctors). Coefficient A represents constant deviation and is corrected by rotating the compass bowl or adjusting standard positioning.

Question 7Marine Navigation

Under COLREGs Rule 19 (Conduct of vessels in restricted visibility), which action is REQUIRED of a power-driven vessel that detects by radar alone the presence of another vessel?

  1. Turn to port for a vessel forward of the beam, unless overtaking.
  2. Determine if a close-quarters situation is developing or risk of collision exists, and if so, take avoiding action in ample time. Correct answer.
  3. Keep her course and speed until the other vessel is sighted visually.
  4. Sound one prolonged blast at intervals of not more than two minutes.

Explanation

Rule 19(d) states that a vessel detecting another by radar alone must determine if a close-quarters situation is developing or if risk of collision exists. If so, she must take avoiding action in ample time. If this action consists of an alteration of course, she must avoid altering course to port for a vessel forward of the beam (except for an overtaking vessel) or altering course toward a vessel abeam or abaft the beam.

Question 8Marine Navigation

Which of the following describes the 'safety contour' setting on an ECDIS?

  1. It is the boundary line that separates safe water from shallow water, dynamically selected from the available contours on the ENC. Correct answer.
  2. It is a line representing the maximum depth of water the vessel can navigate safely.
  3. It is a fixed line on the electronic chart that is set to 20 meters by international regulations.
  4. It is a contour that is only activated when the vessel is navigating in pilotage waters.

Explanation

The safety contour on an ECDIS is selected by the user based on the vessel's draft, squat, and required under-keel clearance. It is the boundary that separates safe water from unsafe water. The ECDIS will select the next deeper contour available in the ENC database if the exact calculated depth is not available (e.g. if safety contour is set to 8.5m and the ENC has 10m, it will default to 10m). The area shallower than the safety contour is shaded blue, and crossing it will trigger a visual and audible alarm.

Question 9Marine Navigation

How does the 'Trial Maneuver' function on an ARPA assist the Master in collision avoidance?

  1. It automatically takes over the steering gear to execute a turn when a target comes within the CPA limit.
  2. It allows the operator to simulate the effect of a proposed course and/or speed change on all tracked targets before executing the maneuver. Correct answer.
  3. It tests the radar transceiver performance by sending a simulated target echo across the screen.
  4. It calculates the maximum speed the vessel can achieve under current sea and wind conditions.

Explanation

The ARPA Trial Maneuver function allows the watch officer or Master to input a proposed course and/or speed change and simulate how it will affect the vectors, CPAs, and TCPAs of all tracked targets over a simulated timeframe. This is critical for verifying that a proposed alteration to avoid one vessel does not inadvertently create a close-quarters situation with another tracked vessel. The simulation must be conducted with care, remembering that targets may also alter course during the time elapsed.

Question 10Marine Navigation

In celestial navigation, what is the 'Geographical Position' (GP) of a celestial body?

  1. The position of the body as coordinates of Declination and Greenwich Hour Angle (GHA).
  2. The point on the Earth's surface directly beneath the celestial body, where its altitude is exactly 90°. Correct answer.
  3. The coordinates of the celestial body relative to the celestial equator and the prime meridian.
  4. The latitude and longitude where the observer is situated when taking the sight.

Explanation

The Geographical Position (GP) of a celestial body is the point on the Earth's surface where a straight line from the body to the center of the Earth intersects the surface. For an observer at the GP, the celestial body would be directly overhead in the zenith, meaning its altitude is exactly 90°. The GP's latitude corresponds to the body's Declination, and its longitude corresponds to the body's Greenwich Hour Angle (GHA).

Question 11Marine Navigation

Which correctors are used to compensate for Coefficient D in a magnetic compass, and what type of magnetism do they correct?

  1. Vertical iron bars (Flinders bar) correcting permanent longitudinal magnetism.
  2. Soft iron spheres (quadrantal correctors) correcting induced horizontal magnetism in symmetrical soft iron. Correct answer.
  3. Horizontal fore-and-aft magnets correcting permanent vertical magnetism.
  4. Heeling magnets correcting induced vertical magnetism.

Explanation

Coefficient D represents quadrantal deviation, which is caused by the horizontal magnetic field induced by the Earth's magnetic field in symmetrical horizontal soft iron structures of the ship. This is corrected by placing soft iron spheres (often called Kelvin's spheres or quadrantal correctors) on brackets on either side of the compass binnacle. The distance of the spheres from the compass bowl is adjusted to achieve compensation.

Question 12Marine Navigation

Under COLREGs Rule 10, how must a vessel cross a traffic lane in a Traffic Separation Scheme (TSS)?

  1. At a heading as near as possible to the general direction of traffic flow.
  2. On a heading as nearly as practicable at right angles to the general direction of traffic flow. Correct answer.
  3. At the highest possible speed to clear the lane quickly.
  4. Along the separation zone to minimize interference with other vessels.

Explanation

Rule 10(c) states that a vessel shall, so far as practicable, avoid crossing traffic lanes, but if obliged to do so, shall cross on a heading as nearly as practicable at right angles to the general direction of traffic flow. Crossing at a right angle minimizes the time spent in the traffic lane and presents the clearest visual and radar aspect (widest profile) to the vessels proceeding along the traffic lane.

Question 13Marine Navigation

What is the primary danger associated with utilizing the 'Ground Stabilized' mode on a radar during collision avoidance maneuvers in a strong cross-current?

  1. It causes the radar transceiver to overheat due to the high processing load.
  2. It can display incorrect aspects of target vessels, leading to incorrect calculations of their true heading and COLREG obligations. Correct answer.
  3. It disables the CPA and TCPA alarm functions.
  4. It causes land masses and fixed navigation marks to move on the screen.

Explanation

Ground Stabilized (COG/SOG) vectors show targets and own ship moving relative to the earth's surface. In a strong cross-current, a vessel's heading (aspect) can differ significantly from its course over ground due to leeway or drift. For collision avoidance (COLREGs), it is critical to know the target's heading (aspect over the water) to determine if it is a crossing, head-on, or overtaking situation. Therefore, Sea Stabilized (HDG/STW) mode must be used for collision avoidance because it shows target aspect and relative vectors through the water.

Question 14Marine Navigation

How should a Navigator verify the integrity of GPS position inputs on an ECDIS during transit?

  1. By checking if the GPS signal strength bar is green on the display.
  2. By cross-referencing GPS positions with alternative methods such as radar ranges/bearings, visual lines of position, or parallel indexing. Correct answer.
  3. By assuming the ECDIS alarm will sound instantly if the GPS position becomes inaccurate.
  4. By restarting the ECDIS unit once every watch to recalibrate the receiver.

Explanation

ECDIS integrity monitoring requires the navigator to continuously cross-reference electronic positions with independent methods. Standard practices include comparing GPS positions with radar ranges/bearings of prominent landmarks, plotting visual lines of position, using parallel index lines on the radar, or comparing dual independent GPS/GNSS receiver outputs. A difference between the charted position and physical radar/visual observations indicates potential GPS drift, jamming, or chart datum discrepancies.

Question 15Marine Navigation

When navigating in a narrow channel under COLREGs Rule 9, what is the steering obligation of a vessel?

  1. A vessel must keep as near to the outer limit of the channel which lies on her port side as is safe and practicable.
  2. A vessel must keep as near to the outer limit of the channel which lies on her starboard side as is safe and practicable. Correct answer.
  3. A vessel must always stay in the center of the channel to maximize under-keel clearance.
  4. A vessel must yield the starboard side of the channel to smaller vessels.

Explanation

COLREGs Rule 9(a) states that a vessel proceeding along the course of a narrow channel or fairway shall keep as near to the outer limit of the channel or fairway which lies on her starboard side as is safe and practicable. This establishes a 'keep to the right' rule to prevent head-on collisions and facilitate safe passing.

Question 16Marine Navigation

What is 'Squat' and how does it change as a vessel moves from deep water into shallow water?

  1. Squat is the decrease in draft due to seawater density changes; it decreases in shallow water.
  2. Squat is the increase in draft and change in trim caused by hydrodynamic pressure changes around the moving hull; it increases significantly in shallow water. Correct answer.
  3. Squat is the rolling motion caused by shallow water waves; it decreases with vessel speed.
  4. Squat is the physical compression of the vessel's hull under speed; it is independent of water depth.

Explanation

Squat is a hydrodynamic phenomenon where a vessel moving through the water creates a localized reduction in water pressure, causing the vessel to sink deeper (increase in draft) and experience a change in trim (head-down or stern-down depending on block coefficient). When entering shallow water, the restricted space beneath and beside the hull restricts water flow, accelerating the velocity of water around the hull. This causes a dramatic increase in squat, heightening the risk of bottom contact.

Question 17Marine Navigation

How does a Navigator determine the 'Wheel Over Point' (WOP) when planning a turn on a chart or ECDIS?

  1. WOP is located exactly at the intersection of the old and new course lines.
  2. WOP is calculated by applying the vessel's turning radius and advance/transfer characteristics, representing where the rudder must be applied to execute the turn. Correct answer.
  3. WOP is always placed 1 nautical mile before the turn intersection point.
  4. WOP is determined solely by the speed of the vessel, regardless of its turning characteristics.

Explanation

The Wheel Over Point (WOP) is the position where the helmsman or autopilot must apply rudder to begin a turn so that the vessel steady on the new course line. WOP is calculated using the vessel's turning characteristics (such as advance and transfer, turning radius, and rudder angle) and the distance the vessel travels during the rudder execution delay. It is plotted at a distance along the original track before the intersection of the two courses, often marked with a radar range and bearing to a prominent landmark (parallel index line) to aid the watch officer.

Question 18Marine Navigation

Which parallel indexing technique should be used to monitor a vessel's lateral position when transiting a narrow channel along a straight leg?

  1. Maintaining a constant bearing to a celestial body.
  2. Setting a parallel index (PI) line on the radar display parallel to the planned track, reference to a prominent radar-conspicuous mark. Correct answer.
  3. Continuously adjusting the radar range scale to keep the vessel in the center.
  4. Monitoring the relative bearing of another vessel in the channel.

Explanation

Parallel indexing is a real-time radar monitoring technique. A line (PI line) is drawn on the radar display parallel to the planned track line at a distance equal to the cross-index range (the perpendicular distance from the track to a radar-conspicuous landmark, such as a headland or island). As long as the echo of the landmark remains on the PI line, the vessel is on track. If the landmark drifts off the PI line, it indicates cross-track error (drift due to current/wind), allowing instant correction.

Question 19Marine Navigation

Except where Rules 9, 10 or 13 otherwise require, which listed vessel must keep out of the way of a RAM vessel under COLREGs Rule 18?

  1. A power-driven vessel constrained by her draft and underway.
  2. An ordinary power-driven vessel underway.
  3. A vessel engaged in fishing and underway, so far as possible.
  4. All of the above. Correct answer.

Explanation

Rule 18(a) requires a power-driven vessel underway to keep out of the way of RAM. A draft-constrained vessel is still power-driven and retains that duty. Rule 18(c) requires a fishing vessel underway to keep clear of RAM so far as possible. Rule 18(d) does not give draft-constrained vessels superior privilege over RAM; its avoid-impeding duty excludes NUC and RAM vessels.

Question 20Marine Navigation

Which of the following is a critical limitation of the 'GNSS/GPS' position input that an ECDIS operator must remain aware of?

  1. GPS coordinates are updated only once every hour.
  2. GPS signals can be disrupted by localized jamming, spoofing, atmospheric anomalies, or satellite geometry issues (high PDOP). Correct answer.
  3. GPS coordinates cannot be displayed on vector charts.
  4. GPS coordinates require manual conversion from Mercator projection to polar projection.

Explanation

GNSS/GPS is highly reliable but vulnerable to external disruptions. Localized jamming (blocking the signal) or spoofing (transmitting false signals) can cause the receiver to show an incorrect position or freeze without triggering an error. High Dilution of Precision (PDOP) due to poor satellite geometry can also degrade accuracy. Navigators must verify GNSS position against visual and radar observations.

Question 21Marine Navigation

Under COLREGs Rule 8 (Action to avoid collision), any alteration of course and/or speed to avoid collision shall, if the circumstances admit, be:

  1. A series of small, incremental course changes to avoid alarming the other vessel.
  2. Large enough to be readily apparent to another vessel observing visually or by radar; a succession of small alterations of course and/or speed should be avoided. Correct answer.
  3. Executed only when the distance between the vessels is less than 0.5 nautical miles.
  4. Made to port in all crossing situations.

Explanation

COLREGs Rule 8(b) dictates that any alteration of course and/or speed to avoid collision shall be large enough to be readily apparent to another vessel observing visually or by radar. A succession of small alterations of course and/or speed should be avoided because they are difficult to detect on radar screens or visually, and may lead the other vessel to believe no action is being taken.

Question 22Marine Navigation

When navigating in polar regions, what is a primary limitation of standard magnetic and gyrocompasses?

  1. The gyrocompass experiences a severe loss of directive force at high latitudes, while the magnetic compass becomes unreliable due to the vertical dip of the Earth's magnetic field. Correct answer.
  2. Both compasses spin rapidly in clockwise directions due to the Coriolis effect.
  3. The magnetic compass is affected by low temperatures, which freeze the compass card liquid.
  4. The gyrocompass undergoes alignment drift due to solar radiation belts.

Explanation

At high latitudes (near the poles), the horizontal component of the Earth's magnetic field becomes weak, and the vertical component increases (magnetic dip), rendering standard magnetic compasses highly sluggish and unreliable. A mechanical gyrocompass relies on the Earth's rotation to create directive force; as latitude increases, the horizontal component of the Earth's rotation decreases, causing the gyrocompass to suffer from alignment errors and a severe reduction in settling force. Navigators must utilize satellite compasses or fiber-optic gyros (FOGs) designed for polar use.

Question 23Cargo Operations

What is the primary objective of performing a 'Draft Survey' on a bulk carrier?

  1. To determine the vessel's dynamic squat prior to sailing.
  2. To calculate the weight of cargo loaded or discharged by measuring the vessel's displacement before and after the cargo operation. Correct answer.
  3. To check the hull for structural deflection or bending stresses.
  4. To verify the accuracy of the electronic draft gauges in the control room.

Explanation

A draft survey is a standardized hydrostatic calculation method used to determine the weight of cargo loaded or discharged from a bulk carrier. By reading the drafts at six points (forward, midships, aft on both sides), applying corrections for trim, density, and water temperature, and subtracting the weight of non-cargo consumables (ballast, fuel, fresh water), the surveyor calculates the vessel's light and loaded displacements. The difference represents the cargo weight.

Question 24Cargo Operations

How does the 'Free Surface Effect' (FSE) of slack tanks affect a vessel's stability, and how is it calculated?

  1. It increases the vessel's GM by raising the center of buoyancy.
  2. It causes a virtual rise in the vessel's center of gravity (KG), thereby reducing the metacentric height (GM); it is calculated by dividing the free surface moment by the vessel's displacement. Correct answer.
  3. It increases the vessel's GZ arm by shifting the center of gravity laterally.
  4. It reduces the draft of the vessel by creating upward hydrodynamic pressure.

Explanation

When a tank is partially filled (slack), liquid shifts as the vessel heels, moving the center of gravity of the liquid laterally. This causes a virtual rise in the ship's center of gravity (G to G1) and a corresponding reduction in the metacentric height (GM). The virtual loss in GM is calculated as: FSE = Free Surface Moment / Displacement, where the moment is i * density_liquid / density_seawater (i = second moment of area of the liquid surface).

Question 25Cargo Operations

Under the IMDG Code, what does the term 'Segregation' refer to?

  1. The separation of hazardous cargoes from crew accommodations only.
  2. The process of separating incompatible dangerous goods to prevent hazardous interactions in the event of leakage. Correct answer.
  3. The division of dangerous goods into different packaging groups based on their level of risk.
  4. The separation of international dangerous goods from domestic cargo.

Explanation

Segregation under the International Maritime Dangerous Goods (IMDG) Code is the process of keeping incompatible dangerous goods apart to prevent fire, explosion, or toxic gas release in the event of a spill. The IMDG Code defines four segregation terms: 'Away from' (minimum 3m), 'Separated from' (minimum 6m), 'Separated by a complete compartment or hold from', and 'Separated longitudinally by an intervening complete compartment or hold from'. This is guided by the Segregation Table in Chapter 7.2.

Question 26Cargo Operations

What is the definition of the 'Angle of Loll' on a vessel, and how is it corrected?

  1. It is the maximum angle of heel caused by wind pressure, corrected by turning into the wind.
  2. It is the angle to which a vessel with a negative initial metacentric height (GM) will list to one side, corrected by lowering the center of gravity (KG). Correct answer.
  3. It is the angle of list caused by an off-center weight, corrected by shifting the weight to the centerline.
  4. It is the angle at which the vessel will capsize under dynamic wave action.

Explanation

An angle of loll occurs when a vessel has a negative metacentric height (GM) in the upright position (unstable equilibrium). The vessel will loll to one side until the center of buoyancy shifts sufficiently to restore positive stability (GZ = 0 at the angle of loll). To correct it, the center of gravity (KG) must be lowered, which is achieved by filling double-bottom tanks (starting with the low side to prevent capsize as the ship rolls through the upright), discharging high deck weights, or shifting weights downward.

Question 27Cargo Operations

Under the International Grain Code, what is the maximum allowable angle of heel due to assumed grain shift?

  1. 5°
  2. 12° (or the angle at which the deck edge is immersed, whichever is less) Correct answer.
  3. 15°
  4. 20°

Explanation

The International Code for the Safe Carriage of Grain in Bulk (International Grain Code) requires that the angle of heel due to assumed grain shift must not exceed 12° (or the angle of deck edge immersion, whichever is less). This rule ensures that the vessel maintains an adequate margin of stability and does not experience progressive flooding or capsizing due to shifting cargo.

Question 28Cargo Operations

What is the primary danger associated with transporting Group A bulk cargoes under the IMSBC Code?

  1. They are highly corrosive to the ship's steel structure.
  2. They may undergo liquefaction if the moisture content exceeds the Transportable Moisture Limit (TML), causing cargo shift and loss of stability. Correct answer.
  3. They are prone to spontaneous combustion due to oxidation.
  4. They emit toxic gases that can asphyxiate the crew.

Explanation

Group A cargoes under the International Maritime Solid Bulk Cargoes (IMSBC) Code are those which may liquefy if shipped at a moisture content of more than their Transportable Moisture Limit (TML). Liquefaction occurs when vibration and motion cause the moisture to rise to the surface, turning the solid bulk cargo into a fluid slurry. This slurry shifts with the ship's roll, creating a large free surface effect and leading to rapid listing and potential capsize.

Question 29Cargo Operations

What is the purpose of the 'Inert Gas System' (IGS) on a crude oil tanker?

  1. To speed up the discharge of cargo by pressurizing the tanks.
  2. To maintain the oxygen content in the cargo tanks below 8% by volume, thereby preventing the formation of an explosive atmosphere. Correct answer.
  3. To clean the cargo tanks using high-pressure inert gas.
  4. To prevent cargo contamination by moisture in the air.

Explanation

An Inert Gas System (IGS) produces gas (usually scrubbed boiler flue gas or nitrogen) with an oxygen content of less than 5% by volume. This gas is piped into the cargo tanks during discharge, ballasting, and transit to replace hydrocarbon vapors and maintain the oxygen level in the tank atmosphere below 8% (the threshold for combustion). This prevents the risk of explosion in the cargo tanks.

Question 30Cargo Operations

Which of the following is a key requirement for a vessel performing 'Crude Oil Washing' (COW)?

  1. The cargo tanks must be ventilated to 21% oxygen before washing starts.
  2. The cargo tanks must be fully inerted with an oxygen content of not more than 8% by volume before and during the washing process. Correct answer.
  3. COW can only be conducted while the vessel is in transit between ports.
  4. Washing must be done using fresh water mixed with chemical solvents.

Explanation

Crude Oil Washing (COW) is the process of cleaning cargo tanks using the solvent action of the crude oil itself during discharge. Because spraying crude oil under high pressure can generate static electricity and explosive gas mixtures, MARPOL Annex I requires that the tanks must be fully inerted, with the IGS operating to keep the oxygen content below 8% by volume. Washing cannot begin or continue if this condition is not met.

Question 31Cargo Operations

How does the 'Permeability' of a cargo space affect a vessel's damage stability?

  1. High permeability means less water can enter the space, improving stability.
  2. Permeability is the percentage of a flooded space that can be occupied by water; high permeability spaces (like empty holds) allow more water to enter when damaged, causing greater loss of buoyancy and stability. Correct answer.
  3. Permeability measures the rate of cargo evaporation, which increases deck pressure.
  4. Permeability determines the required size of the bilge pumps.

Explanation

Permeability (represented by 'mu') is the ratio of the volume of water that can enter a compartment to the total volume of that compartment. Empty holds or engine rooms have high permeability (typically 0.85 to 0.95), meaning that if breached, they will fill with water, causing a massive loss of reserve buoyancy. Cargo holds packed with solid cargo have lower permeability (e.g. 0.40) because the cargo occupies space, preventing water entry. Higher permeability leads to more severe trim, heel, and GM reduction in a damage scenario.

Question 32Cargo Operations

What is the function of 'Stoppers' on container ship lashings?

  1. To prevent containers from sliding on the deck during loading.
  2. To lock the turnbuckles in place and prevent them from unscrewing due to ship vibration during transit. Correct answer.
  3. To stop the container doors from opening during heavy weather.
  4. To limit the height to which containers can be stacked.

Explanation

Turnbuckles are used to tension container lashing rods. Due to engine vibration and the dynamic forces of the ship rolling, turnbuckles can loosen over time. Locking devices (such as locking nuts, wires, or stoppers) are applied to the turnbuckles to secure them in their tensioned state and prevent them from backing off during the voyage.

Question 33Cargo Operations

Under the IMSBC Code, what is 'Transportable Moisture Limit' (TML)?

  1. The maximum concentration of salt water allowed in a cargo hold.
  2. The maximum moisture content of a concentrate or Group A cargo that is considered safe for carriage without risk of liquefaction. Correct answer.
  3. The rate at which a cargo absorbs moisture from the atmosphere.
  4. The amount of condensation that can accumulate on the cargo space overhead.

Explanation

The Transportable Moisture Limit (TML) is the maximum moisture content (expressed as a percentage of the dry cargo weight) at which a Group A cargo can be safely carried. The TML is calculated as 90% of the Flow Moisture Point (the moisture level at which liquefaction begins under test conditions). Cargoes must be tested prior to loading to ensure their actual moisture content is below the TML.

Question 34Cargo Operations

When loading a cargo of steel coils, what is the primary structural concern, and how is it mitigated?

  1. The risk of chemical corrosion, mitigated by painting the tank top.
  2. High localized point loading on the tank top, mitigated by placing dunnage (usually key-wood or softwood) to distribute the weight across longitudinal frames. Correct answer.
  3. The risk of the coils melting due to friction, mitigated by ventilating the holds.
  4. High tension on the hatch covers, mitigated by using lashings.

Explanation

Steel coils are heavy, concentrated cargo that can exert forces exceeding the maximum allowable load limits of the inner bottom plating (tank top). To prevent structural failure or deformation, coils must be stowed across the vessel's longitudinal frames using layers of softwood dunnage. Dunnage increases the contact area, distributes the weight, and provides friction to prevent the coils from shifting.

Question 35Cargo Operations

Which of the following is a primary safety check before starting Crude Oil Washing (COW)?

  1. Verifying that the deck air compressors are running at maximum capacity.
  2. Confirming that the oxygen content of the inert gas being delivered to the cargo tanks is less than 5% by volume. Correct answer.
  3. Ensuring all cargo tank hatch lids are wide open for ventilation.
  4. Confirming that the cargo tanks are filled with fresh water to dissolve the crude residues.

Explanation

To safely perform COW, the tanks must be maintained in an inert state to eliminate fire risk. The oxygen content of the inert gas entering the tank must be checked and confirmed to be under 5% by volume, ensuring the tank atmosphere itself does not exceed 8% oxygen. If the oxygen content rises, the washing operation must be suspended immediately.

Question 36Cargo Operations

How does the 'Stowage Factor' (SF) of a cargo affect cargo space planning?

  1. It determines the required lashing tension for deck cargoes.
  2. It indicates the volume (in cubic meters or cubic feet) occupied by one metric ton of the cargo, allowing the planner to determine if the vessel will 'full and down'. Correct answer.
  3. It measures the rate of cargo deterioration during transit.
  4. It defines the maximum allowable height of cargo in the hold.

Explanation

Stowage Factor (SF) is the ratio of volume to weight for a cargo, commonly expressed as cubic meters per metric ton (m³/t) or cubic feet per long ton. It tells the cargo planner how much space the cargo will occupy. If a cargo has a high SF (e.g. wood chips), the holds will fill up before the vessel reaches its load line draft ('full but not down'). If it has a low SF (e.g. iron ore), the vessel will reach its load line draft while holds are still mostly empty ('down but not full').

Question 37Cargo Operations

What is the purpose of a 'Stability Booklet' onboard a ship, and who must approve it?

  1. It provides guide notes for the crew on ship maintenance, approved by the shipyard.
  2. It contains hydrostatic tables, cross curves, and loading conditions to allow the Master to calculate the ship's stability; it must be approved by the Administration (or Classification Society on its behalf). Correct answer.
  3. It is a logbook of the vessel's daily rolling period, approved by the Chief Mate.
  4. It is an educational textbook on naval architecture, approved by the IMO.

Explanation

SOLAS requires every passenger ship and cargo ship of 24 meters and upward to carry a Stability Booklet. It provides the Master with clear guidance on the vessel's stability characteristics under various operating conditions (ballast, loaded, timber, etc.) and contains the hydrostatic data necessary to calculate stability for any custom loading condition. The booklet must be officially approved by the flag State Administration or its recognized Classification Society.

Question 38Cargo Operations

When loading coal in bulk, which hazard must the Master monitor in accordance with the IMSBC Code?

  1. The risk of the coal dissolving in water.
  2. The dual hazards of methane gas emission (creating an explosive atmosphere) and self-heating/spontaneous combustion. Correct answer.
  3. The risk of chemical reaction with wood dunnage.
  4. The emission of radioactive isotopes.

Explanation

Coal is classified under Group B (and sometimes Group A) of the IMSBC Code due to its chemical hazards. It can emit methane (a highly flammable gas that can accumulate in cargo holds and ignite) and is prone to self-heating through oxidation, which can lead to spontaneous combustion. Watch officers must monitor gas levels (methane, carbon monoxide, oxygen) and hold temperatures daily.

Question 39Cargo Operations

What does the 'Stiffness' of a vessel refer to in terms of stability?

  1. The structural rigidity of the hull girder against bending.
  2. A condition of high stability characterized by a large metacentric height (GM), resulting in rapid, violent rolling motions with short roll periods. Correct answer.
  3. The resistance of the rudder to turning forces.
  4. The tension in the mooring lines when the vessel is berthed.

Explanation

A 'stiff' ship has a large GM, usually caused by loading heavy cargo low in the vessel. Because the righting arm GZ grows rapidly as the ship heels, the vessel has strong righting energy and rolls back to the upright position quickly and violently. This short rolling period causes high accelerations that can break cargo lashings, damage equipment, and cause severe seasickness. It is contrasted with a 'tender' ship (low GM, slow and easy rolling).

Question 40Cargo Operations

How does water density in a port affect the draft of a vessel when loading?

  1. A vessel will float deeper (show more draft) in fresh water than in salt water because fresh water is less dense. Correct answer.
  2. A vessel will float higher (show less draft) in fresh water because fresh water exerts more buoyant force.
  3. Water density has no effect on draft; it only affects the cargo volume.
  4. The vessel's draft will decrease when loading in brackish water compared to sea water.

Explanation

According to Archimedes' principle, a floating vessel displaces a volume of water equal in weight to the weight of the vessel. Salt water is denser (standard 1.025 t/m³) than fresh water (1.000 t/m³). Therefore, the vessel must displace a larger volume of fresh water than salt water to support the same weight. This causes the vessel to sink deeper (exhibit a larger draft) in fresh water. The Fresh Water Allowance (FWA) calculates this change.

Question 41Ship Operations

In ship construction, what is the purpose of the 'Panting' frames and stringers?

  1. To support the weight of the main propulsion engine.
  2. To resist the fluctuating external water pressure forces at the bow when pitching in waves. Correct answer.
  3. To prevent the deck cargo from sliding transversely.
  4. To reinforce the hull against collision forces at the stern.

Explanation

Panting refers to the in-and-out bellows-like movement of the hull plating at the bow and stern caused by the rapid variations in hydrostatic pressure as the ship pitches in waves. To resist this, the bow structure is reinforced with extra horizontal web frames (panting stringers) and vertical frames (panting beams) to stiffen the shell plating.

Question 42Ship Operations

Under MARPOL Annex I, what is the maximum oil content allowed in bilge water discharged into the sea from a vessel of 400 gross tonnage and above?

  1. 5 parts per million (ppm)
  2. 15 parts per million (ppm) Correct answer.
  3. 50 parts per million (ppm)
  4. 100 parts per million (ppm)

Explanation

MARPOL Annex I Regulation 15 prohibits any discharge of oil or oily mixtures into the sea from ships of 400 gross tonnage and above, unless: the ship is proceeding underway, the oily mixture is filtered through an approved oil filtering equipment (oily water separator) that ensures the oil content of the effluent does not exceed 15 parts per million (ppm), and the system is equipped with an automatic stopper that halts discharge if the 15 ppm limit is exceeded.

Question 43Ship Operations

When deploying a marine 'Sea Anchor' (drogue) from a survival craft, what is its primary function?

  1. To provide drinking water by condensing seawater.
  2. To reduce the rate of drift and keep the bow of the craft pointed into the wind and waves to prevent capsizing. Correct answer.
  3. To catch fish for emergency rations.
  4. To anchor the craft to the seabed in shallow water.

Explanation

A sea anchor (or drogue) is a conical fabric bag deployed on a line from the bow of a survival craft (lifeboat or liferaft). By creating drag in the water, it slows the craft's downwind drift (keeping it closer to the search area) and holds the bow into the wind and waves. This alignment helps the craft ride the waves safely and prevents it from broaching (turning broadside to the waves) and capsizing.

Question 44Ship Operations

What does the term 'Pounding' refer to in ship operations, and how is it mitigated?

  1. The noise of the main engine pistons, mitigated by adding lubricating oil.
  2. The impact of the ship's bow slamming against the water surface when pitching heavily in head seas, mitigated by reducing speed and/or altering course. Correct answer.
  3. The rubbing of mooring lines against the fairleads, mitigated by using protective sleeves.
  4. The action of the cargo shifting inside the holds, mitigated by tighter securing.

Explanation

Pounding (or slamming) occurs when a vessel pitches heavily in head or bow-quartering seas, causing the bow to lift out of the water and slam down onto the sea surface with high force. Pounding can cause severe structural damage to the bottom plating in the forward region. To mitigate it, the Master must reduce speed (reducing the frequency and force of impacts) or alter course to change the pitching period, or increase draft forward by ballasting.

Question 45Ship Operations

Under the IAMSAR Manual, which search pattern is MOST appropriate for a single ship searching a large area when the survivor's position is highly uncertain?

  1. Sector Search (SS)
  2. Parallel Sweep Search (PS) or Creeping Line Search (CS) Correct answer.
  3. Expanding Square Search (ES)
  4. Track Line Search (TS)

Explanation

According to the International Aeronautical and Maritime Search and Rescue (IAMSAR) Manual Volume III, the Parallel Sweep Search (PS) is used when the search area is large, the survivor's position is uncertain, and only one searching vessel is available (or when multiple vessels search adjacent lanes). Creeping Line Search (CS) is similar but used when the target is more likely to be at one end of the search area. Expanding Square (ES) is used when the datum position is known within close limits, and Sector Search (SS) is for a highly localized datum.

Question 46Ship Operations

In ship maneuvering, what is the 'Pivoting Point' of a vessel when making a turn?

  1. It is the point at the rudder hinge where all turning forces are applied.
  2. It is the point on the centerline about which the ship rotates during a turn; when going ahead, it is located roughly 1/3 to 1/4 of the ship's length from the bow. Correct answer.
  3. It is the center of gravity of the vessel.
  4. It is the point where the bow wave intersects the stem.

Explanation

The pivoting point is the point on the centerline of a vessel about which she rotates when turning. When a vessel is moving ahead in a straight line and applies rudder, the pivoting point moves forward, settling at approximately 1/3 to 1/4 of the ship's length from the bow. When moving astern, the pivoting point shifts aft, settling near the stern. Understanding the position of the pivoting point is critical for pilots and masters when maneuvering in confined spaces with tugs.

Question 47Ship Operations

How does the 'Shallow Water Effect' affect a vessel's steering response during maneuvering?

  1. It makes the rudder highly responsive, reducing the turning diameter.
  2. It causes the rudder to lose efficiency, making the vessel sluggish to turn, and can lead to unexpected yawing or 'smelling the bottom'. Correct answer.
  3. It eliminates the pivoting point, causing the ship to slide sideways.
  4. It increases the vessel's ahead speed for the same engine RPM.

Explanation

In shallow water, the water flow past the hull is restricted, creating a localized high-pressure area ahead of the bow and a low-pressure area under the stern. This pressure distribution can make the rudder sluggish and reduce its steering effectiveness. The vessel may also experience unexpected yawing or resist turning (a phenomenon known as 'smelling the land' or 'smelling the bottom'), requiring large rudder angles and slow speeds to maintain control.

Question 48Ship Operations

What is the purpose of 'Shear Strake' in ship construction, and where is it located?

  1. It is the top row of side plating adjacent to the strength deck, designed to resist high longitudinal bending stresses. Correct answer.
  2. It is the row of bottom plating adjacent to the keel.
  3. It is a diagonal brace inside the cargo hold.
  4. It is the plating that forms the watertight bulkhead.

Explanation

The shear strake is the uppermost strake (row of plating) of the ship's side shell, connecting the side shell to the strength deck (at the gunwale). Because it is located at the extreme vertical limit of the ship's girder, it experiences the highest longitudinal tensile and compressive stresses when the ship undergoes hogging and sagging. It is therefore made of thicker, higher-strength steel than standard side plating.

Question 49Ship Operations

Under MARPOL Annex V, what are the disposal restrictions for 'Plastic' garbage generated onboard a vessel?

  1. It can be discharged into the sea if the vessel is more than 12 nautical miles from land.
  2. The discharge of all plastics, including synthetic ropes, fishing nets, and plastic garbage bags, into the sea is prohibited. Correct answer.
  3. Plastics can be dumped in special areas if ground to less than 25mm.
  4. Plastics can be burned in the galley stove at any time.

Explanation

MARPOL Annex V Regulation 3 explicitly prohibits the discharge into the sea of all plastics, including but not limited to synthetic ropes, synthetic fishing nets, plastic garbage bags, and incinerator ashes from plastic products. Plastics must be retained onboard and discharged to port reception facilities, or incinerated in an approved shipboard incinerator.

Question 50Ship Operations

What is the purpose of 'Sacrificial Anodes' on a ship's hull, and how do they function?

  1. To improve the vessel's propulsion efficiency by reducing skin friction.
  2. To protect the steel hull from galvanic corrosion by corroding preferentially (sacrificing themselves) due to their higher electrochemical activity (usually made of zinc or aluminum). Correct answer.
  3. To act as contact cushions when rubbing against concrete berths.
  4. To provide electrical grounding for the ship's AC generators.

Explanation

Sacrificial anodes are blocks of highly active metal (such as zinc, aluminum, or magnesium) welded or bolted to the ship's steel hull, propeller shaft, and rudder. In seawater (an electrolyte), a galvanic cell is formed. The anode, being more electronegative than the steel hull, becomes the anode in the electrochemical reaction and corrodes (dissolves), protecting the steel hull (which acts as the cathode) from rusting. They must be replaced during drydocking.