Man Overboard Situation on Ship and Ways to Tackle it

Man overboard is a situation wherein a ship’s crew member falls out at sea from the ship, no matter where the ship is sailing, in open seas or in still waters in port.

A seafarer has to be very careful while performing his/her duties onboard vessel as it can never be taken for granted that a person cannot fall off the ship due to bad weather, swell in the sea, accidents, and due to negligence.

A man overboard is an emergency situation and it is very important to locate and recover the man overboard person as soon as possible as due to bad weather or rough sea, the crew member can drown or else due to temperature of the cold water the person can get hypothermia.

Photo by belchonoc/depositphotos

What Is Hypothermia?

Hypothermia is a situation wherein there is an extensive loss of body temperature due to prolonged contact of the body with cold water, and the body’s normal metabolism and functions get affected.

A person will get unconscious after 15 minutes in water with a temperature of 5 ̊ C.

Actions to be Taken during Man Overboard Situation

The initial and early sighting of the fallen crew plays a vital role in increasing the percentage of saving his/her life. The actions for a MOB mentioned below are extremely urgent and must be taken without any delay to save the life of the person who has fallen overboard.

  1. Shout ‘Man Overboard on Starboard/Portside’
  2. Change over to hand steering from auto and put the wheel hard over to the respective side (port or starboard)
  3. Release MOB marker from the side of the bridge wing to which MOB has occurred. This marker is buoyant and has a self-igniting light as well as a self-activating smoke signal
  4. Press the MOB button on the GPS to mark the position of the casualty for future reference
  5. Sound ‘O’ on the whistle (Three prolonged blasts). This is to let the Master and the crew know about the emergency situation. Supplement this with the appropriate ‘O’ flag
  6. Post extra lookout as soon as possible
  7. Sound the General Alarm on the ship’s whistle to alert everybody to proceed to stations. This is to ensure that if the crew has not understood the three prolonged blast for MOB, they are alerted regardless and proceed to muster stations to assist in the recovery of the person
  8. Thereafter, announce the MOB situation on the ship’s PA system
  9. Inform the engine room of the situation and let them know that manoeuvring will be required
  10. Execute the Williamsons turn (explained later)
  11. Keep a keen eye on the RADAR/ARPA and put the VHF on Channel 16
  12. Maintain a record of all the events in the Bell book
  13. Carry out Master’s orders
  14. The Chief Mate should take-over all decisions based on deck with regard to lowering survival craft etc
  15. The Third Mate ought to assist the Master on Bridge
  16. The officer in charge at the moment must send out an “Urgency signal” on all the communications systems to let ships in the vicinity know about the situation
  17. Keep the lifebuoy (MOB marker) insight
  18. The rescue boat should be manned adequately with enough personnel to carry out the rescue operation
  19. A portable handheld VHF must be carried by the officer in the rescue boat
  20. Once the person is rescued, the rescue boat must be picked up upon arrival close to the ship along with the lifebuoy and hoisted back
  21. Immediate first aid should be administered if required
  22. An ‘Urgency Signal’ must be sent out to cancel the last transmitted MOB alert
  23. Appropriate entries must be made in the Ship’s Logbook
  24. The Master must carry out an enquiry with respect to the MOB incident and all entries made in the Ship’s Logbook

The engines are not stopped immediately to keep the person away from the propeller. The same is the case for wheel hard over to the side of the casualty as it is done to keep the stern away from the casualty.

Screaming about the MOB at the instant that the mishap is realised is of paramount importance to use all manpower available for immediate use.

The lifebuoy also adds to the life-saving process as the smoke signal leaves a conspicuous mark by the day or night. It is also important to pick up the lifebuoy to not confuse any other ships passing by about the status of the MOB. They must not assume that there is a MOB in the vicinity and proceed towards helping the person when he has already been rescued.

Entries in the Ship’s Logbook hold great legal importance and should be made carefully. Always try to succeed in the first attempt as even a little delay can cause a human life.

The Williamson Turn

  1. Note the position of the ship
  2. Put wheel hard over to the side of the casualty
  3. After the ship has altered course by about 60 degrees, put the wheel hard over to the other side
  4. When the vessel is 20 degrees short of the reciprocal course, wheel on the midship

The Scharnow Turn

  1. Put the rudder over hard toward the person
  2. After deviating from the original course by about 240 degrees, shift the rudder hard to the opposite side.
  3. When heading about 20 degrees short of the reciprocal course, put the rudder amidships so that vessel turns onto the reciprocal course.

The Anderson Turn

  1. Stop the engines.
  2. Put the rudder over toward the person
  3. When clear of the person, go all ahead full, still using the full rudder.
  4. After deviating from the original course by about 240 degrees (about 2/3 of a complete circle), back the engines 2/3 or full.
  5. Stop the engines when the target point is 15 degrees off the bow. Ease the rudder and back the engines as required.

You may also like to read: Important Features of Muster List on Ship & Different Types of Alarms on Ship

Disclaimer: The authors’ views expressed in this article do not necessarily reflect the views of Marine Insight. Data and charts, if used, in the article have been sourced from available information and have not been authenticated by any statutory authority. The author and Marine Insight do not claim it to be accurate nor accept any responsibility for the same. The views constitute only the opinions and do not constitute any guidelines or recommendation on any course of action to be followed by the reader.

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  1. The mate on the bridge must push the GPS MOB button that it wiil record the position the crew member was fallen and other the mate must turn to side where crew member fell, he must keep the propeller clear from the crew member in the water.

  2. Appreciate all the important aspects you mention and I may add If it happen during the hour of darkness, suggest to execute the “Williamson Turn” to keep track on the victim as close as possible.

  3. The firs person, who locate the man overboard will drop the life ring and say Man Overboard, inform the navigational bridge and constantly looking for the man. OOW will push button GPS MOB informing master and others ships via VHF.

  4. Very informative although some are already mentioned during the trainings but during the event of man overboard panic and stress to the officers to do the recovery. The best way is to have the bi-monthly exercise.

  5. I wonder when and how we should use the code flag O and how boats in sight should react when seeing it/

  6. 4 things which are never told in the booklets:
    1) All people react differently in a real situation. Some people parralyze and other may need to take the lead.
    2) You are searching a very small object. All you will see is the persons head, in a choppy wild sea. Not easy at all.
    3) The mob boat works nice in smooth seas, surely a dangerous piece of equipment in seas or swell.
    4) Propeller effect when coming astern is not working is moderate or high swell. Taking no 3 in consideration it might be wiser to manoeuvre astern to the person in the water and push the Emergency stop of the M/E close to the casualty once you where able to throw a bouy with a line, enabling to pull the person to a pilot ladder.

  7. With our modern cruiseships it is not wise to put the wheel hard to port or starboard when steaming full ahead: the ship will get a list, making a mess inside the ship. First give 3 degrees rudder and wait until the ship starts turning, then add a few degrees rudder, wait until the ship is turning faster and so on.To put the wheel hard to port or starboard in small steps will keep the ship upright with a little list without making a mess inside the ship.

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