The test consists of random questions on a selected topic.
*Which of the following statements applies to fire doors in main vertical zone bulkheads and stairway enclosures in passenger ships?
They shall be of the self closing type
They shall be capable of closing with an angle of up to 3, 5° opposing closure
They shall be capable of being closed from a control station
All the mentioned alternatives
When an HF band a DSC distress alert is received, you have to listen to:
8414.5 kHz (DSC distress frequency in 8 MHz)
the radio-telex distress frequency in the band in which the DSC distress alert was received
the radiotelephony distress fequency in the band in which the DSC distress alert was received
Where several rescue units are engaged in a search and rescue operation, one of will be designated as the On-Scene Commander (OSC). Which of the following descibes how this appointment will be made?
The role of OSC can only be taken by a naval ship with suitable command and control capability. In many regions, such vessels are permanently assigned on stand-by to assume such a role.
The first rescue unit to arrive at the scene will normally assume the role of OSC, until the unit appointed as OSC by the RCC is in a poisition to assume the role.
The OSC will initially be a controlling aircraft. Once a suitable vessel is on scene, the responsibility will be passed to them.
The OSC will always be designated by the appropriate Rescue Coordination Centre. No other vessel may assume the role at any time.
The Urgency Message from a ship is used to notify other traffic of a situation where the ship is not in imminent danger, but where the development of the situation is uncertain and may need assistance in the near future. What is the telephony urgency message like?
In radio-traffic with a coast-station, a “personal call” means that one wishes:
to have a telephone conversation with a person whose name is known
to request a telephone alert call
to have a telephone conversation for account of a requested shore subscriber
In relation ot OPA 90, Which of the following statement is correct?
COTP-zones may have additional rules and regulations
OPA-90 specify all oil cargo related rules and regulations
OPA-90 specify rules and regulations for all COTP-zones
After implementation of OPA-90 there are no area specific rules and regulations
The ship has completed a 360 degree turn at full speed in deep water. The ship is now to repeat the turn at full speed in shallow water. What will be the difference in the turning circle diameter?
The turning diameter will be smaller in shallow water
The turning diameter will be the same for all depths
The turning diameter will be increased in shallow water
It will be the same provided the UKC is 25%-50%
The vessel is in a 360 degrees turn with engine full ahead. If the speed is reduced during the turn, will there be any change in the turning diameter?
Yes, the turning diameter will increase if the speed is reduced.
No, the turning diameter will only change if the rudder angle is reduced
Yes, the turning diameter will be smaller if the speed is reduced.
No, the turning diameter will not change if the speed is reduced.
Which of the following duties shall be included in the "muster list" as being assigned to crewmembers in relation to passengers ?
ensuring that extra food and water is taken to the survival craft
clearing the escape routes
assembling passengers at muster station
ensuring that every passenger is provided with an immersion suit or a thermal protective aid
How many two-way VHFs is required for ships over 500 brutto?
One per lifeboat and one spare
If you are going aloft in a bosun's chair what kind of hook would you use to hook the chair to the rope?
I would refuse going aloft
A stainless steel butcher's hook that is designed to take the load
An approved hook with a locking device
The fire control draft on board is called the safety plan and shall be posted onboard. In port, a copy of this plan shall in addition be available from somewhere else. Where must this copy be available?
In the engine control room.
Handed over to the surveyors.
What is the most likely reason for vibration and noise at the suction side of a centrifugal pump when it is running?
Pump suction valve fully open.
Water hammer in the pump casing.
Fluid friction in the suction line.
Collapsing vapour bubbles due to cavitation.
In a large, 2 stroke, main diesel engine cylinder lubricating oil is supplied directly through lubrication points cut into the cylinder liner. At what point during the cycle should the supply normally occur.
At mid-stroke of the piston.
As the piston rings pass the lubrication points.
Under the IMDG code what class is assigned to a Fumigated Container?
Which is the "TUG TOWING LINE', in the figure?
The Tug Towing Line is indicated by B, in the figure
The Tug Towing Line is indicated by D, in the figure
The Tug Towing Line is indicated by C, in the figure
The Tug Towing Line is indicated by A, in the figure
In a series installation of a purifier and a clarifier, what is the purpose of the clarifier
As a safety net, for improved cleaning of the fuel oil
You will probably have less alarms
In case the gravity disc is too small
To get round the problem of fluctuating temperature
Where can the size of the Magnetic Compass Error be found?
By taking a transit bearing of two fixed geographical positions and comparing it with the bearing of the same points on the chart
On the chart in the centre of the compass rose or by reference to the Variation chart, taking into account the annual changes
By reference to the last entry in the Compass Error Log Book
By taking the error from the Deviation Table on the bridge
A cargo of palletized fruit on oblong pallets is being loaded into the 'tween deck space of a conventional reefer ship by stevedores under the supervision of the ship's crew. The pallets are loaded with the long side athwartships to ensure a stable stow. The final space in the first row is too small to fit another pallet athwartships. Select the option which gives the best course of action to be taken to deal with this situation.
Use a forklift truck to force the last pallet into the gap.
Complete the next row and fill the gap with dunnage (air) bags.
Complete the next row, cover the deck and secure the gap with wooden dunnage and plywood.
Turn the final pallet through 90 degree to fill the gap.
Which is the lee side of a ship?
The lee side is the side facing the wind
The lee side is abaft the accommodation
The lee side is the side facing away from the wind
The lee side is forward of the accommodation
What is the substance added to a dough mixture to make it rise, during the baking of bread?
An engine room rating notices that the guard on a running pump is hanging loose due to a missing bolt on the support bracket and it is catching the shaft coupling. What is the best action to take as a repair method?
Place a sheet of metal in front of the guard to deflect any parts that may fly off as a temporary repair.
Inform the watchkeeper so that the pump can be stopped and a new bolt can be fitted to permanently fix the guard in place.
Try and fit a new bolt while the pump is running to permanently fix the guard in place.
Fasten the guard back in place with a piece of rope with the pump running as a temporary repair.
On a General Cargo Vessel, what must be done if a crane or derrick block sheave is found to be worn?
No action needs to be taken
Inform Chief Officer and prepare to change block if required
Block changed at next thorough inspection
Monitor condition of block regularly
A steward reaches into a sink filled with soapy water to remove the plug. He cuts his hand on a carving knife lying in the bottom. What policy will best eliminate the chance of this kind of accident happening again while still maintaining hygiene standards?
Everymember of the galley staff is made responsible for washing their own knives.
Heavy duty gloves are to be worn when working at the sink.
Detergent shall not be used if knives are to be washed.
There is a dedicated sink for washing knives.
Why is air draught an important consideration when loading bulk cargoes on Bulk Carriers?
Because the vessel may pass under a bridge(s) whilst approaching or leaving the berth
Because of the vessel's movement whilst berthing or unberthing
Because of variations in under keel clearances whilst alongside the berth
Because of movement of the bulk cargo loader or unloaders
The stowage factor of a consignment of car parts is given by shippers as 3.00 cubic metres/metric tonne; what space will be required to load 100 tonnes of this type of cargo on a General Cargo Vessel?
On a Container vessel, what is the purpose of fixed stacking cones?
To prevent the horizontal movement of 40'containers at tank top level
To prevent horizontal movement of 20'containers in 40' cell guides
To prevent movement of 20'and 40' containers at deck level
To prevent the horizontal movement of 20'containers at tank top level
If all indications are that a cargo has been received without damages, irregularities or short shipment and the phrase "apparent good order and condition" are entered on the Bill of Lading, what type of Bill is this said to be?
An endorsed Bill of Lading.
A Due Title Bill of Lading.
A Bill of Lading completed for shipment.
If whistles are fitted on a vessel at a distance apart of more than 100 metres, will manoeuvring and warning signals, as defined by rule 34 of the International regulations for Preventing Collisions at Sea, be given on one or both whistles?
Manoeuvring signals will be given only on the forward whistle; warning signals will be given on both whistles simultaneously.
They shall be given on one whistle only.
They shall be given on both whistles simultaneously.
They shall first be given on the forward whistle, followed by the after whistle, with a 5 second inetrval in between.
A sudden or gradual increase of the chloride content in the freshwater cooling indicates:
Leakages from seawater coolers
Leakages from oil coolers
Low concentration of corrosion inhibitors
If a boiler is smoking “black smoke” a possible cause can be
Too little combustion air
Fuel oil temperature too low
What do we mean with LEL when measure the atmosphere?
LEL is limit for level alarm
LEL is lowest temperature for ignitionLEL is limit for level alarm
LEL is lower explosive limit
What are the people probably doing in the picture?
The people are fighting a fire
The people are playing with water
The people are hosing down the cargo hold to clean it.
The people are pressure testing the hull plating
Why do we use stabilisers on passenger ships?
To decrease the dynamic stability
To adjust the trim of the vessel
To increase the intact stability
To decrease the rolling angle of the vessel
Which of the following will be reported to a company on the emergency phone?
All arrival and departure time from port
All cases concerning cargo shortages
All accidents where crew are injured or killed
Depending on density or API, an error measurement of 0.1 degree Fahrenheit in a tank containing 50,000 cubic metres (314,491 barrels) of oil will result in which of the following volumes?
35 cubic metres (220 barrels).
25 cubic metres (157 barrels).
7 cubic metres (44 barrels).
16.5 cubic metres (104 barrels).
What name is given to the knife used for cutting meat from a joint during service?
Not all crude oils can be used for crude oil washing. What is the common recommendation to use a crude oil for washing.
The temperature must at all times be 10 degrees Centigrade above the oil’s pour point temperature.
As long as the oil is floating.
Depends on the oil’s density.
The temperature must at all times be 25 degrees Centigrade above the oil’s pour point temperature.
The majority of conversions adopted under the auspices of IMO fall into which of the three main categories:
Maritime Safety, Prevention of Marine pollution, Liability and compensation
Maritime Safety, STCW, Maritime Security
When are power-operated watertight sliding doors (class 3 doors) compulsory for all watertight doors aboard passenger ships?
Where the ship is fitted with through-going car decks
Where one or more doors are situated below deepest load line
When the ship is certified for more than 150 passengers
Where the ship has passenger spaces below the bulkhead deck
What is the most utilised pump type for cargo discharge on a gas carrier?
Hydraulic driven centrifugal pump.
An electrical operated submerged centrifugal pump.
Where should containers with fishmeal cargo be carried?
On deck away from sunlight
Separated from class 4.2 containers
The use of steam driven ejectors for ventilation of cargo tanks having flammable vapours in them is not recommended now-a-days due to:
Steam at high velocities may generate static electricity which might cause incentive sparks?
It being not a very effective system for tank ventilation?
It is rather expensive to waste steam?
It might cause burns to unwary personnel?
Which statement is correct for a fire door class "A-60"?
Class "A-60" fire doors shall prevent the passage of smoke and flame and the average temperature of the unexposed side shall not rise more than 180 degrees Celsius within 60 minutes
Class "A-60" fire doors shall be capable of preventing the passage of flame for minimum 60 minutes
Class "A-60" fire doors must be closed within 60 seconds
It is a requirement to keep class "A-60" fire doors closed for minimum 60 minutes
Which of the following is an international requirement?
Securing of cargoes must completed within two hours of leaving the berth
Securing of cargoes must be completed before a ship leaves the berth
Securing of cargoes may be completed at anchorage
Securing of cargoes must be completed before sailing
On a General Cargo Vessel the Tonnes per Centimetre (TPC) of a vessel is 30; the present mean draught of the vessel is 6.90 m and the maximum summer load draught is 7.00m; Calculate the amount of cargo that can still be loaded?
The amount of cargo that can still be loaded is 300 tonnes
The amount of cargo that can still be loaded is 3000 tonnes
The amount of cargo that can still be loaded is 30 tonnes
The amount of cargo that can still be loaded is 3 tonnes
A vessel such as a parcel chemical tanker, with an high inbuilt level of subdivision will typically not have a problem with which particular feature of stability which will need to be accounted for on other tankers that have large, unrestricted tanks?
Ability to maintain an effective trim throughout loading and discharge operations.
Expansion of cargo within tanks, due to cargo heating, with a consequent movement of overall Centre of Gravity.
Why does a hatch cover hydraulic system deteriorate?
Due to dust and cargo particles lodging around the piston seals
Due to hatch cover operations in high summer temperatures
Due to repeated hatch cover operations
Due to ice accretion on piston jackets
According to MARPOL there are requirements regarding minimum amidships draught for crude oil tankers in ballast condition. What is the formula for calculating minimum draught amidships?
Why is it necessary to cool down LNG cargo tanks slowly prior to loading cargo?
To minimise the risk of creating a vacuum in the tank.
To minimise thermal stresses in the cargo tank.
To prevent ice forming in the cargo tank.
To minimise thermal stresses in the hull.
What extra precautions should be taken by the officers and crew if some of the passengers are disabled, i.e. using wheelchair, cane, blind etc.?
Locate them in large cabins to ease their stay.
All passengers that will require extra assistance, also in case of an emergency situation/ evacuation, must be registered in order to allocate crew to assist them if needed.
Passenger with some form for disability must travel with accompany, and live in same cabin or next door.
They must be placed in cabins on the same level as the muster station.
Why do we use stabilisers on passenger ships?
To adjust the trim of the vessel
To decrease the dynamic stability
To increase the intact stability
To decrease the rolling angle of the vessel
What is the name of this unit?
An antistatic release unit
A hydrostatic release unit
Following overhaul of the cylinder units of a 4-stroke diesel engine and a suitable running in period it is noted that the lubricating oil consumption of the engine has increased considerably and unexpectedly. The engine is otherwise running normally. Select, from the options given, the most likely cause of this problem.
A piston crown has burnt through
The oil control ring has been fitted incorrectly.
The piston rings have worn rapidly.
The cylinder liner has worn rapidly.
Car decks on board ro-ro passenger ships are nomally closed during sea passage. Why are passengers not allowed to be on the car-deck during sailing?
Vehicles and other cargo can shift when the ship is rolling. Persons may be trapped between vehicles or cargo.
To prevent burglary and damage to cars
If the car decks are empty, it will be easier for the crew to locate all passengers in case of an emergency
In case of an emergency situation it can be difficult for passengers to escape. Vehicles, lorries, trailers and other cargo are maybe lashed and it is a substantial chance for passengers to get injured. Vehicles and other cargo might also shift when the ship is rolling.
What should be done with the data logger printouts after completing the discharge of a refrigerated cargo?
They should be retained onboard for a minimum of 2 years.
They should be handed over to the cargo receiver.
They should be retained onboard indefinitely.
They can be discarded once the discharge is completed.
Tab washers are often fitted to bolted assemblies to prevent the nuts and bolts slackening. For an assembly where the nuts are positioned at the top select the option which describes the correct method of locating the tab washers.
Bend the inner tab up against one flat of the nut and the other tab down over the edge of the component.
Bend the outer tap down over the edge of the component and leave the other tab flat against the component.
Bend the outer tap up against one flat of the nut and leave the other tab flat against the component.
Bend both tabs up against opposite flats of the nut.
Is there any requirements regarding double bottom for large passenger ships?
No, a double bottom is not required
Yes, in ships of 76 m in length and longer, a double bottom shall be fitted amidships, and extend to the fore and aft not less that ? of the ship length.
Yes, in ship of 76 m in length and upwards, a double bottom shall be fitted amidships, and shall extend to the fore and after peak bulkheads, or as near thereto as practicable.
Yes, a double bottom shall be fitted amidship
A ship has an electrical system rated at 690 Volts. Which voltage level is this?
Which of the options given is likely to be the reason for a drop in the charge air manifold pressure of a diesel engine operating with an exhaust gas turbocharger?
Insufficient cooling of the charge air.
Exhaust gas boiler fouled.
Engine room exhaust fans stopped..
A mechanical seal, consisting of carbon and ceramic seal rings, is to be fitted to a cetrifugal pump shaft. What is the most likely result of not being extremely carefull when fitting this type of seal?
The spring and bellows for the seal can be easily damaged.
The rubber O rings for the seal can be easily damaged.
The seal rings are brittle and can be easily chipped or damaged.
The seal rings are hard and may score the pump shaft.
A cargo pumproom must be mechanically ventilated. What is the minimum number of atmosphere changes per hour that such a system must achieve?
There is no specified minimum number of changes, provided it is running continuously throughout any cargo operation.
What is the most common way to control the tank pressure on a LNG tanker?
To let the gas escape through the safety valves.
To transfer the gas to another tank which is at a lower pressure.
To discharge the gas into the atmosphere through the vents.
To use the boil-off gas as fuel for the vessel.
A vapour compression refrigeration system is usually fitted with a number of devices to give protection and control of the system. Which of the methods given in the options should be used to test the high pressure cut out during routine maintenance and checking of the system?
Manually close each of the evaporator coils by switching off the electrical supply to the liquid line solenoid shut off valves and monitor the condenser pressure.
Close the condenser outlet valve and closely monitor the condenser pressure.
Gradually shut in the condenser cooling water valve or the condenser refrigerant inlet valve while closely monitoring the compressor discharge pressure.
Charge the system with refrigerant until the high pressure cut out operates.
According to guidance provided by the OCIMF, what is the requirement for bolting/securing blind flanges on the manifolds during cargo operations on an oil tanker?
A bolt to be in every alternate bolt hole, tightened evenly
A minimum of 4 bolts, spaced evenly around the flange
Bolts or clamps to be fitted such that the flange is adequately sealed
A bolt to be in every bolt hole, tightened evenly
What type of cargo tanks are normally used for the cargo containment system for fully pressurised and semi-pressurised liquefied gas carriers?
Electric ozone generators are sometimes used to remove residual odours from refrigerated cargo spaces. Which of the options given is the additional action required to ensure the operation is successful?
The cargo space should be cooled down using the refrigeration plant.
The cargo space should be fumigated.
The fans should be run continuously in the cargo space.
The source of the odour must be located and removed.
Where shall you be able to activate the ship security alert system on board ro-ro passenger ships?
From the navigation bridge and in at least one other location
Captain's- and Chief Officer's office
TBN - total base number from a lube oil test, indicates the:
Amount of organic acids in the oil.
Amount of contaminants in the lubricating oil.
Alkalinity of the lubricating oil.
Which of these will not physically damage a bulk carriers’ plating, frames and brackets?
The Threshold Limit Value (TLV) refers to as parts to million (PPM) by volume of gas in air. What does the time weighted average of ppm indicates?
The average of exposure to a toxic substance per day.
The maximum exposure to a toxic substance per 8 hours working day.
The maximum exposure to a toxic substance per day.
The average exposure to a toxic substance per 8 hours working day.
Prior to loading a reefer cargo it is good practise to carry out an 'ice test' of the temperature sensors within the cargo space. Part of the test is to immerse the sensors in a test bucket of known temperature, usually zero degrees Celsius as this is the melting point of ice. Which of the options is correct in relation to preparing the test bucket?
Insulated ice buckets should be filled with crushed ice purchased in bulk from a shore supplier.
Insulated ice buckets should be filled with ice produced in the vessel's low temperature chamber. A hole the exact size of the sensor should be drilled into the ice and the sensor inserted into the hole to give a rapid test process.
Insulated ice buckets should be filled with ice cubes approximately 2 centimetres square which have been made from clean distilled water.
Insulated ice buckets should be filled with ice cubes approximately 2 centimetres square and a small quantity of distilled water to produce an ice-water mixture. The ice cubes should be produced from clean distilled water.
What purpose has the discharge booster pump on a gas tanker?
The main purpose of booster pumps is to avoid overflow during loading.
The main purpose of booster pumps is to increase the manifold pressure.
The main purpose of booster pumps is to maintain the manifold temperature.
The main purpose of booster pumps is increase the tank pressure.
A pallet of chilled cargo is made up by placing cartons on top of each other in tiers. Banding straps are then placed tightly around the cartons in way of robust, vertical cardboard corner pieces. Which of the given options is the main purpose of having these corner pieces?
The colour of the corner pieces indicates the carriage temperature of the cargo on the pallet.
The corner pieces reduce chafing against adjacent pallets.
The corner pieces add rigidity and strength to the stow of cartons on the pallet.
The length of the corner pieces acts as a guide for the height of the pallet.
Reefer vessels form part of the 'cold chain' in the transport of perishable goods from the producer to the consumer. There are times when hatches have to remain open in less than perfect conditions, for example strong winds. There are steps that can be taken however to mitigate the effects of this on cargo that has already been loaded. Which of the options given could be considered to be the most important measure to counter the effect of such conditions?
Run the cargo fans continuously during cargo operations.
Refrain from ventilating the cargo with fresh air.
Reduce the air delivery temperature.
Cover the stow with a Tenasco (heavy plastic) sheet where possible to protect it from the wind.
For what purpose do we have booster pumps on the cargo discharge line?
To increase discharge rate.
To reduce the flow and pressure to shore line.
To increase discharge pressure and reduce the cargo temperature.
To increase discharge discharge line pressure above shore back pressure.
When the cable length from the temperature sensor to the place where we want to read the temperature exceeds approx. 10 meters we normally have to, in case of a Pt 100, in some way compensate for the cable resistance. Do we also have to do this if we choose to use a T802 temperature sensor?
Depends on temperature to be measured.
What do we mean to gas free a cargo tank?
To gas free a cargo tank means that we remove flammable-, neutral- or toxic atmosphere from the cargo tank
That means that we are discharging the cargo tank
To gas free a cargo tank means that we remove gas from the cargo tank
To gas free a cargo tank means that we are pumping liquid into the tank
What factors do you consider as important before mooring a vessel?
Use of proper Personal Protective Equipment, Well maintained mooring equipment, Make sure the area is tidy and clean, Mooring stations should have effective hazard markings/ hazard highlighting, Stay clear of mooring ropes/wires, Be aware of Snap-back Zone, Proper procedures, Effective communication
Use of proper Personal Protective Equipment, Mooring stations should have effective hazard markings/ hazard highlighting, Stay clear of mooring ropes/wires, Be aware of Snap-back Zone, Proper procedures
Use of proper Personal Protective Equipment and be aware of Snap-back Zone
Use of proper Personal Protective Equipment
If a vessel is fitted with “free flow system”, what does it mean?
That the cargo is free flowing in all tanks at all times.
A vessel without ordinary bottom lines where the cargo flows from tank to tank through bulkhead valves.
The vessel is not equipped with own discharging equipment.
That the vessel is only able to load on gravity.
On a RoRo vessel, what must be ensured onboard the vessel prior to commencing cargo?
That all cargo is ready for loading
That the vessel has been cleared by immigration
Cargo hold ventilation systems are operational
You are in an area of restricted visibility, close to a port. You hear this signal. What vessel does it come from and what additional information does the signal provide?
A vessel at anchor, more than 100 metres in length. She is sounding the additional signal to give warning of her position.
A vessel aground, more than 100 metres in length. The additional signal indicates which side the clear water lies on.
A vessel at anchor, less than 100 metres in length. She is sounding the additional signal top give warning of her position.
A vessel at anchor, more than 100 metres in length. The additional signal indicates that her cable extends at least 25 metres from her bow.
Which of these can be loaded in the same hold of a General Cargo Vessel, as steel coils?
You are mid-way through the discharge of several grades of chemicals. You hear a sudden change in tone on a cargo pump and notice hydraulic oil spraying from a broken oil supply pipe. What will you do?
Secure some heavy duty rubber packing over the hole in the pipe and place a bucket underneath to contain any continuing leakage. Throw a bag of sand around the area to make it less slippery.
Activate the hydraulic emergency stop. Notify the Duty officer. Close all manual cargo valves. Prepare for emergency spill response.
Stop the cargo pump supplied by the broken line. Continue discharge with all other pumps.
Notify the duty engineer and request a fitter evaluates the problem with the hydraulic line.
Cargo compressors are fitted on LPG carriers as part of the cargo and vapour handling system. Why is it important to 'bar over' a piston type LPG compressor before starting it up?
To prove the oil pump is working.
To avoid low suction pressure during start up.
To reduce the electrical start up load..
To make sure there is no liquid in the cylinders.
What name is given to the pickled, fermented vegetable condiment that accompanies almost every Korean dish?
In a US port and according to the Code of Federal Regulations, a 'Declaration of Inspection' must be completed before the transfer of an oil cargo can take place. Who is responsible for preparing this Declaration?
The ship's officer in charge of the oil transfer operation.
The Terminal Representative (Loading Master).
The US Coast Guard Captain of the port (COTP) or his designated representative.
During a pre-loading survey prior to loading grain on a Bulk Carrier, very small amount of the previous grain cargo is found in a cargo hold; what is the significance of this situation?
The cargo hold can be cleaned while other holds are loaded
The affected cargo hold should be left empty
The vessel may fail the pre-load survey and be declared off-hire
The remaining cargo from the previous voyage can be ignored
On a Container vessel, why should a vessel not carry left and right-handed twistlocks?
Because containers cannot be locked using both types of twistlock
Because there will be confusion as to whether or not containers are locked
Because international regulations do not permit it
Because the two types of twistlock have different strength ratings
"Which of these precautionary measures can reduce the threat of piracy, if implemented?"
Plan to arrive at port at night.
Turn off all of the ship’s lights at night.
Stay at least 15nm away from the shore.