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Questions and Answers
What is the consequence of a ship rolling or pitching, causing the propeller to break the surface or approach it closely?
What is the consequence of a ship rolling or pitching, causing the propeller to break the surface or approach it closely?
What action should be taken immediately if someone falls overboard?
What action should be taken immediately if someone falls overboard?
What is the maximum speed at which a boat can safely be used for recovery in most sea conditions?
What is the maximum speed at which a boat can safely be used for recovery in most sea conditions?
Why should a lee be made for the boat during recovery operations?
Why should a lee be made for the boat during recovery operations?
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What should be done if the person overboard is lost from sight during recovery operations?
What should be done if the person overboard is lost from sight during recovery operations?
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What can guide the boat during recovery operations in moderate weather?
What can guide the boat during recovery operations in moderate weather?
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What is the purpose of the Williamson turn maneuver?
What is the purpose of the Williamson turn maneuver?
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What happens when the MOB function is activated on a marine GPS unit?
What happens when the MOB function is activated on a marine GPS unit?
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At what water temperature (C) can a person survive for up to 40 hours?
At what water temperature (C) can a person survive for up to 40 hours?
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What is the purpose of the ARPA radar autodrop MOB?
What is the purpose of the ARPA radar autodrop MOB?
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What happens to a person in water at a temperature of 0°C?
What happens to a person in water at a temperature of 0°C?
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What is the name of the YouTube video that demonstrates man overboard rescue procedures?
What is the name of the YouTube video that demonstrates man overboard rescue procedures?
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What is the purpose of the ECDIS display MOB?
What is the purpose of the ECDIS display MOB?
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At what water temperature (C) can a person become unconscious?
At what water temperature (C) can a person become unconscious?
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What should be worn by persons on deck when working in areas where there is a risk of falling or being washed overboard?
What should be worn by persons on deck when working in areas where there is a risk of falling or being washed overboard?
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What should be provided when working overside or in an exposed position where there is a risk of falling or being washed overboard?
What should be provided when working overside or in an exposed position where there is a risk of falling or being washed overboard?
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What is the critical factor in recovering personnel who have fallen overboard?
What is the critical factor in recovering personnel who have fallen overboard?
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What is the first action to be taken by the observer in an 'Immediate action' situation?
What is the first action to be taken by the observer in an 'Immediate action' situation?
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What should the officer of the watch do immediately after being alerted to a 'Man overboard' situation?
What should the officer of the watch do immediately after being alerted to a 'Man overboard' situation?
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What type of situation occurs when a casualty is reported to the bridge by an eye witness?
What type of situation occurs when a casualty is reported to the bridge by an eye witness?
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What is the purpose of an orange-smoke float in a 'Man overboard' situation?
What is the purpose of an orange-smoke float in a 'Man overboard' situation?
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What type of situation occurs when a person is reported to the bridge as 'missing'?
What type of situation occurs when a person is reported to the bridge as 'missing'?
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Study Notes
Man Overboard Manoeuvring
- Persons on deck should wear a harness and be secured by lifeline to prevent falls and being washed overboard or against the ship's structure.
Safety Precautions
- A lifebuoy with sufficient line should be provided when working overside or in an exposed position where there is a reasonably foreseeable risk of falling or being washed overboard.
- A lifejacket or buoyancy aid should be provided in such situations.
- Thermal protective clothing should be provided to reduce the risks of cold shock when necessary.
Man Overboard Situations
- There are three types of man overboard situations: "Immediate action", "Delayed action", and "Person missing" situations.
Immediate Action
- If the MOB accident is observed, the observer should cry, "Man overboard to port (or starboard)".
- The officer of the watch should then carry out three simultaneous actions:
- Put the wheel hard over to the side the man has fallen.
- Release a life-buoy.
- By day, use an orange-smoke float, burning for 15 minutes.
Sea Water Effects on Victim
- Water temperature affects the time to be alive for a person overboard:
- 0°C: Less than 1 hour.
- 4°C: 0.5-3 hours.
- 10°C: 1-6 hours.
- 16°C: 2-24 hours.
- 21°C: 3-40 hours.
- 27°C: Undetermined.
Man Over Board (MOB) Function on GPS
- The MOB function is a common feature on marine GPS units.
- It marks the current location when a person falls overboard and directs the conning officer back to the point.
ECDIS Display MOB
- ECDIS display MOB function is available.
Man Overboard/ARPA Radar Autodrop MOB
- ARPA radar autodrop MOB function is available.
Williamson Manoeuvre
- The Williamson turn is a maneuver used to bring a ship or boat back to a point it previously passed through, often for the purpose of recovering a man overboard.
- However, if the ship is rolling or pitching, causing the propeller to break surface or approach it very closely, the person is in grave danger.
Recovery Procedures
- If the engines are maintained at full revolutions and the wheel is kept hard-over, the vessel will follow a turning circle, taking it back to the area where the person is situated.
- In moderate weather, a boat may be lowered and maneuvered towards the person, guided by radio or morse signals from a lookout aloft.
- If the person is lost from sight, the boat should proceed back along the ship's track on a compass course.
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Description
This quiz covers safety measures to prevent falls and accidents on deck, including the use of harnesses and lifelines, and procedures for man overboard situations.
