MOB (Man Overboard): A Rescue Procedure for Getting Someone Safely Back on Board

Some emergencies at sea are easy to notice. An engine suddenly stops, an alarm sounds or something breaks on board, and everyone knows there’s a problem. MOB, short for Man Overboard, can be different.

Someone might lose their balance, be caught by an unexpected wave or slip while working on deck. And it doesn’t always happen with a shout. In some cases, a person can fall into the water almost silently. Even if they call out, crew members elsewhere on the boat may not hear them. That means it can take a while to notice someone has been left behind.

That’s why a MOB procedure is about more than returning to the person in the water. First, you need to keep them in sight. Then you need to bring the boat back under control and recover them safely. Trying to work all of that out for the first time during a real emergency is a situation you’d rather avoid.

What Does MOB Mean?

MOB stands for Man Overboard and describes someone falling from a boat into the water. There’s a straightforward reason it’s one of the most important emergency procedures in boating: while the boat keeps moving, the person in the water can quickly be left far behind. Waves, darkness, rain or poor visibility can make finding them again much harder. Those first few seconds matter more than you might think.

What Should You Do First When Someone Falls Overboard?

The first job of the person who sees the fall isn’t to take the helm or run to the radio. It’s to keep the person in sight. Once the incident is noticed, the crew should start the following sequence as quickly as possible:

1. Shout “Man overboard!” loudly to alert the crew.
2. Keep pointing at the person and don’t take your eyes off them.
3. Throw a lifebuoy or another suitable flotation aid.
4. Mark the MOB position on the chartplotter or GPS.
5. Prepare the boat for a safe return manoeuvre.

These actions should all begin within seconds. The first two are especially important. If possible, the crew member watching the person shouldn’t take on another task. While everyone else handles the radio, lines and manoeuvre, their only job should be tracking the person in the water. In rough conditions, even a few seconds of distraction can make finding them again significantly harder.

Throw Flotation Equipment First

Even if the person is wearing a lifejacket, it’s worth throwing additional flotation equipment as soon as possible.

Depending on what’s available on your boat, this might include:

• a lifebuoy,
• a horseshoe buoy,
• a lifebuoy with a light,
• a rescue throw line.

During night passages, equipment with lights becomes even more important. The aim isn’t only to help the person stay afloat. The equipment can also help mark the area where they fell.

So don’t assume, “I didn’t land it right next to them, so it’s useless now.” Flotation equipment may help the person and provide a reference point for tracking the incident area. Where you keep it matters too. Hiding MOB equipment at the back of a hard-to-reach locker to keep the boat looking tidy isn’t a good idea. In an emergency, you need to reach it within seconds.

Find the MOB Button Before You Need It

Most modern chartplotters and GPS systems have a MOB function. When activated, it records the position where the incident happened. If you lose sight of the person, that mark can help you return to their last known position. But there’s an important distinction here:

A MOB mark doesn’t replace watching the person. Current, wind and waves can carry them away from the recorded position. An electronic position mark is an important extra layer of safety. The main goal, though, is to maintain visual contact for as long as possible.

Turn on your chartplotter while you’re still in harbour and learn how to activate its MOB function. An emergency isn’t the time to start searching through menus.

How Does the Boat Return to the Person?

During MOB training, you may encounter several return manoeuvres. It’s difficult to present one as the right method for everyone. Whether the boat is powered or sailing, the wind, sea conditions and crew numbers can all affect the choice. Here are some common approaches.

Quick-Stop

The main aim of a quick-stop is to bring the boat under control promptly without allowing it to get too far from the person. Often used in sailing training, this approach involves a short turn intended to keep the boat nearby. Its biggest advantage is limiting the distance between the boat and the person as much as possible. However, the exact execution can vary with the boat’s rig and sailing situation, so it needs to be practised beforehand.

Figure-of-Eight Turn

Another option is returning in a figure-of-eight pattern. The boat initially moves safely away from the person, then makes a controlled turn to establish the approach again. This is one of the MOB manoeuvres commonly used in training.

A Controlled Return in a Powerboat

In a powerboat, the main goal is to return under control and eliminate the propeller hazard during the final approach. One especially important point is to avoid swinging the stern towards the person in an uncontrolled way. Speed needs to remain very low over the final few metres.

One of the Biggest Risks on Approach: the Propeller

Finding someone and reaching them doesn’t mean the rescue is over. In fact, this is where one of the stages requiring the most care begins. When approaching a person in the water with an engine-powered boat, you need to keep the propeller’s position in mind throughout.

How the engine is used during the final approach may vary with the boat and conditions. But when it’s time to recover the person, the propeller hazard must be eliminated. The crew should already know who is controlling the engine and which side of the boat will be used for recovery. Everyone reaching over different sides in a panic won’t make things easier. It could even put a second person in the water.

Getting Someone Back on Board Can Be Harder Than You Expect

This is one of the most overlooked parts of MOB drills. We’ve found the person. We’ve brought the boat alongside. Now we’ll get them aboard. Written down, it sounds simple. Reaching the person again also brings an understandable sense of relief.

But wet clothing, waves, exhaustion and cold can make this stage much harder than expected. Someone who has spent a long time in the water may no longer have the strength to climb a ladder. Your recovery plan needs to go beyond “they’ll climb back up.”

Depending on the equipment on your boat, you may be able to use:

• a boarding ladder,
• a rescue line,
• a lifting sling,
• a winch or pulley system.

If the person is conscious and able to move under their own power, a ladder may be one of the easiest options. But a high freeboard, rough conditions or an injury may call for another method. Here’s a useful question to ask yourself:

Have you actually tried recovering someone from the water on your own boat? If the answer is no, your MOB drills need to include the recovery itself, rather than only the return manoeuvre.

What If the Person Is Getting Cold?

Water temperature is an important factor in an overboard incident. Cold water can speed up heat loss, and spending a long time immersed can increase the risk of hypothermia. We won’t give a blanket statement such as “you can survive this many minutes at this temperature.” Too many variables affect the outcome.

For example:

• what the person is wearing,
• their physical condition,
• whether they have a lifejacket,
• the sea state,
• how much they move in the water.

All of these can change the effects of the cold.

Once the person is back on board:

• Remove wet clothing when conditions allow.
• Provide dry clothing or blankets.
• Shelter them from the wind.
• Monitor their level of consciousness and breathing.

Confusion, loss of coordination, slurred speech or reduced shivering can indicate serious effects from the cold. Professional medical help is needed in that situation. Don’t give food or drink to an unconscious person, and avoid uncontrolled, rapid warming.

How Much Can Technology Help in a MOB Situation?

MOB technology has developed considerably in recent years. It’s best understood as an extra layer of safety, rather than a replacement for the basic procedure.

AIS MOB Devices

AIS MOB transmitters, which can be fitted to certain lifejackets, can help display the person’s position on compatible AIS equipment when activated. This may offer an important advantage at night or in poor visibility. Prices vary considerably by brand, model and features, so giving a single figure here wouldn’t be useful.

VHF Radio with DSC

DSC systems can be used to send a digital distress alert from a correctly configured radio. But having the equipment on board is only part of the picture. You also need to know how to use it. “We’ve already got one on the boat” doesn’t help much in an emergency.

Smartwatches and Personal Electronics

Some smartwatches and personal devices offer fall detection, location sharing or emergency functions. These can be useful, but they shouldn’t be treated as primary systems that replace purpose-built marine MOB equipment.

MOB Is Much More Dangerous When Sailing Alone

If you’re out alone, a MOB situation takes on a different dimension. There’s no second person to get you out of the water. And if the boat continues under autopilot, it can move away from you within seconds. That makes preventing a fall overboard the main priority when boating alone.

Depending on the boat and conditions, equipment such as the following becomes especially important:

• a lifejacket,
• a safety tether,
• suitable attachment points,
• an engine kill-switch system,
• a personal MOB/AIS device.

Especially when leaving the cockpit, staying attached to the boat can, in some conditions, matter even more than the rescue procedure itself. “It’ll be fine” isn’t much of a safety plan at sea.

How and When Should You Practise MOB?

The procedure looks straightforward on paper. On an actual boat, things are different. Even spending a few seconds deciding who takes the helm, who watches the person and where the lifebuoy is can delay the response.

For example, a crew of four could divide the tasks like this:

You don’t need to put a real person in the water for a drill. To avoid unnecessary risk, it makes more sense to use a suitable flotation aid or a purpose-made training target. You can practise this sequence:

Alarm → pointing → flotation equipment → MOB position → return → approach → recovery

If the boat is new to you, someone has joined the crew or you haven’t practised for a while, it’s worth running through it again. A short MOB drill at the start of the season can remind everyone where the equipment is and how the boat responds during a manoeuvre. The aim isn’t to break a speed record. It’s to make sure everyone knows what to do.

Can You Prevent a MOB Incident in the First Place?

You can’t prevent every accident, but you can reduce the risk. Much of that work happens before anyone falls into the water.

Habits that can make a real difference include:

• keeping the deck tidy,
• avoiding unnecessary movement on deck at night,
• wearing suitable footwear,
• wearing a lifejacket when needed,
• using a safety tether in heavy weather,
• keeping one hand available to hold on while moving around a pitching deck.

There’s a familiar boating saying: “One hand for yourself, one for the boat.” Keeping that in mind, especially on a moving deck, may help you avoid needing the MOB procedure at all.

The Most Important Part of MOB: Don’t Lose Sight of the Person

The core of the MOB procedure is to keep the person in sight, bring the boat back under control and recover them safely. On paper, that sounds simple enough. In a real incident, wind, waves, panic and crew coordination all come into play at once.

That’s why MOB is a procedure to practise under controlled conditions, rather than simply read about and move on. In an emergency, already knowing what to do makes a big difference.

Sources

1. Royal Yachting Association (RYA) — Man Overboard and boat-handling training content; MOB procedures and recovery manoeuvres.
2. RYA — Cruising and boat-handling training materials; MOB approaches and crew organisation.
3. Sahil Güvenlik Komutanlığı — Turkish Coast Guard Command — Official sources on emergencies at sea, search and rescue, and current contact information.
4. International maritime training sources — Training procedures covering quick-stop, figure-of-eight and crew organisation for MOB.

Note: The way a MOB manoeuvre is performed may vary with the boat’s type, equipment, weather and sea conditions. This article provides general information. Practising the procedure with an experienced instructor under controlled conditions is much safer than learning it through theory alone.