Man Overboard Scenario: Upgrading Outdated MOB Equipment on a Commercial Vessel

Under the UK Maritime and Coastguard Agency (MCA) Small Commercial Vessel Code and SOLAS Chapter III Regulation 17-1 and most codes, vessels must have a practical method for recovering a person from the water. This requirement is based on vessel-specific risk assessment and focuses on whether the crew can safely carry out a recovery during an emergency.

It is not enough to carry recovery equipment onboard. The system must work in practice, often requiring a practical demonstration that satisfies the flag surveyor - including for an unconscious casualty.

However, many commercial vessels still rely on basic recovery methods such as ladders or scramble nets that were installed to meet minimum carriage requirements rather than functional recovery performance.

This creates a clear gap between:

• what is installed onboard (compliant equipment, but limited recovery capability in practice)
• what is required to safely recover a casualty in real conditions

This distinction reflects a performance-based compliance approach, where regulations focus on recovery outcome and effectiveness rather than prescribing a single mandatory system.

This analysis uses a structured hypothetical vessel scenario to model man overboard recovery performance under controlled conditions for comparison purposes.

It is not based on a specific vessel, incident, or real operational report, intended for vessel operators, masters, safety officers, surveyors, and procurement personnel responsible for man overboard (MOB) risk assessment, equipment specification—and recovery system selection.

A typical small commercial vessel scenario is used to highlight limitations of legacy recovery equipment, identify potential recovery gaps, and demonstrate how a structured recovery system can improve casualty recovery, crew safety, and alignment with SOLAS and MCA guidance.

In short, the article explores how a vessel can move from basic legacy equipment to a more practical and effective recovery system that satisfies the regulations.

To keep this practical and consistent, we will follow a simple vessel scenario throughout:

This scenario represents a typical small commercial workboat or charter vessel profile, where man overboard risk is managed under standard MCA coding requirements.

Scenario Example #1 – Baseline Vessel Condition

A small commercial vessel operating under MCA coding carries a lifebuoy, a scramble net, and a basic recovery ladder. There is no dedicated lifting or assisted recovery system onboard. Recovery relies on crew manual effort at the vessel side. It has a moderate freeboard height of 3m.

This scenario is used to explain how a vessel may move from a basic recovery setup towards a more structured system-based approach. Environmental assumptions for this scenario include moderate sea state, limited crew numbers, and potential low-visibility or night-time recovery conditions.

In many commercial vessel settings, existing recovery arrangements may include:

• scramble nets
• vertical ladders
• lifebuoys with line attachment
• manual lifting equipment from waterline level
• boat hooks and reach / recovery poles

These systems are generally classified as passive recovery aids, meaning they rely on casualty participation or direct manual handling at the vessel side. In some cases, these arrangements may function adequately under more controlled conditions, for example:

• calm sea state where vessel movement is limited and casualty recovery can be carried out steadily
• conscious casualty able to assist their own recovery
• close proximity recovery with minimal time in the water
• lower freeboard arrangements reducing vertical lift distance
• minimal vessel-side obstruction where access to the casualty is clear

These systems may be installed to meet survey and carriage requirements, rather than optimised recovery performance under worst-case conditions.

Scenario Example #2 – Initial Review Finding

During a routine onboard safety review, the vessel’s existing man overboard recovery arrangements are assessed. This includes a scramble net, a vertical ladder, a lifebuoy with recovery line, and a number of basic reach aids such as a simple boat hook.

At first inspection, these items provide a method of attempting recovery. However, when assessed as a complete system, the recovery process still relies entirely on manual lifting over the vessel side, without mechanical assistance or any controlled lifting arrangement.

At this stage, the assessment moves away from individual equipment items and focuses on the recovery process as a whole, specifically how a casualty would actually be recovered from the water under different conditions.

The key consideration becomes whether the existing arrangement supports a safe, controlled, and repeatable recovery process in practice.

In this case, the review identifies several functional gaps in the recovery sequence:

• recovery is dependent on manual lifting by crew at the vessel side, even where crew numbers may be limitedF
• there is no assisted lifting or load control method during transfer from water to deck
• casualty transfer is not stabilised during lifting, regardless of freeboard height
• there is no defined method for controlled recovery of a casualty from a short distance away from the hull
• the recovery method remains unchanged regardless of casualty condition, including unconscious or non-responsive scenarios

This type of evaluation is known as a system-based recovery assessment, where focus is placed on the entire rescue chain: locate → reach → secure → stabilise → transfer → recover

When assessed as a complete system, the vessel can still make contact with a casualty at the waterline, but there is limited control over what happens next during the recovery. This becomes more important where vessel-side access is restricted, or where vessel movement reduces the effectiveness of ladders or scramble nets. 

At this stage, the focus moves away from listing equipment and instead considers what the vessel can actually achieve during recovery. In other words, whether there is a clear and workable method to:

• extend controlled contact to the casualty, allowing safe initial connection without direct hand reach
• secure and stabilise the casualty prior to lifting, reducing movement in the water
• manage transfer from water to deck in a controlled manner, rather than relying on manual lifting alone
• support recovery where the casualty is immobile or unconscious, requiring full-body support during transfer

From Individual Equipment to Recovery Process

At this point, it becomes clear that recovery is not a single action but a sequence of linked steps. Each step must function correctly for the overall recovery to be successful.

A complete man overboard recovery process typically includes:

• locating and reaching the casualty
• establishing controlled contact
• securing and stabilising the casualty in the water
• transferring the casualty alongside the vessel
• lifting or moving the casualty to deck level
• managing crew workload throughout the operation

Modern safety management principles emphasise that each stage must remain functional under worst-case operational conditions, not just ideal conditions.  If any stage relies entirely on manual effort without control, the overall recovery becomes inconsistent and difficult to manage.

Scenario Example #3 – Distance Recovery and Initial Control of Casualty

During the start of a simulated man overboard drill, the in-water casualty is treated as unconscious and partially submerged at an angle, drifting at a distance from the vessel’s side. Direct ladder or scramble net access is not immediately possible due to positioning and vessel movement, combined with the condition of the casualty, who is in no condition to use equipment unassisted. The priority becomes establishing controlled contact without relying on direct hand reach. A controlled distance recovery method is needed to bring the casualty first into a stable position alongside the vessel.

Man Overboard Equipment Assessment:

It can be stated that the capability of the crew, and the equipment available for use, is not fully aligned with the current scenario conditions and casualty state. This is due to the fact that the arrangements currently available onboard are typically designed for vessel-side recovery only.

Whilst they may provide a method of reaching the waterline, and can be effective where a casualty is conscious, able to self-assist, or able to make hand contact for recovery once alongside, they are not designed to actively control or manage a casualty before they arrive alongside the hull from a distance.

Scenario Example #3.1 – Attempt at Distance Recovery Rescue

An attempt is made to recover the casualty using all available onboard equipment. A lifebuoy and recovery line are deployed, and the casualty is successfully able to gain contact with the line and is brought towards the vessel’s side. Once alongside, the scramble net and vertical ladder are made available, however the casualty is too incapacitated to assist themselves onto either system.

A basic telescopic boat hook is then used to maintain control of the casualty at the vessel side while crew attempt to stabilise and recover them onboard. 

Due to the casualty’s condition and limited ability to assist, recovery becomes a slow and physically demanding process. Additional intervention is required, including a crew member entering the water to assist with stabilisation and transfer back to the vessel.

Whilst recovery is ultimately achieved, the process is unstructured and dependent on manual intervention at multiple stages, including in-water assistance by crew. This introduces additional risk, extends recovery time, and highlights reliance on crew strength / limitations, and improvisation rather than a controlled recovery method.

In this condition, recovery becomes variable and non-repeatable, heavily dependent on crew strength, timing, and vessel movement.

Outcome of the Man Oveboard Rescue (Legacy Equipment):

During the drill, the casualty is eventually brought alongside the vessel using the lifebuoy and recovery line, with additional assistance from crew at the vessel side. However, once the casualty reaches the hull, the recovery process becomes increasingly dependent on manual intervention and improvised handling.

The scramble net and ladder provide access, but the casualty is unable to use them independently, requiring further physical assistance to complete the transfer. A crew member entering the water is ultimately required to stabilise and support the casualty during recovery, highlighting a breakdown in controlled transfer from water to deck.

Whilst the casualty is recovered, the process is slow, labour-intensive, and dependent on in-water crew intervention. This also introduces additional risk to both casualty and crew and reinforces that recovery capability is largely reliant on manual effort rather than a structured system.

Whilst recovery is ultimately achieved, the process is unstructured and dependent on manual intervention at multiple stages, including in-water assistance by crew.

This introduces increased operational risk, including:

• crew exposure in the water
• delayed casualty recovery time
• increased likelihood of injury during transfer
• reliance on improvisation under pressure
• The scramble net and ladder provide access, but the casualty is unable to use them independently.

It is important to keep in mind that from a system perspective, the limitation is not equipment failure, but the absence of a structured man overboard recovery method that manages the full rescue sequence under operational conditions.

This aligns with the intent of SOLAS Chapter III Regulation 17-1 and the UK MCA Small Commercial Vessel Code and other codes, which require vessels to have a practical means of recovering a person from the water, based on vessel type, operating conditions, and the crew available onboard.

The regulation is performance-based rather than prescriptive, meaning compliance is determined through risk assessment and practical demonstration rather than a fixed equipment list.

The requirement is therefore focused on the outcome of recovery capability, not the specific equipment used to achieve it.

In practical terms, this means vessels may still be fully aligned with SOLAS and MCA expectations whilst using different recovery arrangements, provided those arrangements are considered suitable within their assessed operating profile.

However, this also means that recovery operation can vary significantly between vessels, particularly in scenarios involving:

• unconscious or non-assisting casualties
• increased distance from the vessel side
• limited crew availability
• vessel movement and higher freeboard conditions

Whilst arrangements such as ladders, scramble nets, and basic recovery aids may meet regulatory expectations based on vessel-specific risk assessment under the MCA Small Commercial Vessel Code and SOLAS III Regulation 17-1, they do not inherently ensure a controlled or repeatable recovery outcome across all casualty conditions and operational scenarios.

This is particularly relevant where the vessel has been equipped to meet assessed or minimum requirements, but those arrangements are not designed to adapt to a wider range of recovery situations, such as unconscious casualties, increased distance from the vessel side, or limited crew availability.

As a result, a distinction can be made between equipment that satisfies compliance requirements through assessment, and a recovery system that consistently delivers controlled recovery performance in real operational conditions.

Scenario Example #3.2 – Repeat Drill with Updated MOB Recovery System

A repeat of the man overboard drill is carried out under the same operational conditions. The casualty is again treated as unconscious and partially submerged at a distance from the vessel’s side, with similar vessel movement, freeboard, and limited crew availability.

An initial attempt is made using a lifebuoy and recovery line. This allows the casualty to gain contact and be initially supported in the water, bringing them within a workable range of the vessel’s side.

Once the casualty is within range, a telescopic man overboard cradle recovery pole is deployed. The extended reach of the pole allows controlled contact to be established without requiring the casualty to continue holding onto the recovery line. This provides a more stable and directed method of bringing the casualty inboard towards the vessel side.

The casualty is then guided directly into the cradle using the pole system while still in the water. This removes the need for ladder or scramble net access as the primary means of transfer and reduces reliance on casualty participation Once secured in the cradle, the casualty is maintained in a stable, medically preferred horizontal position. This provides full-body support during recovery and removes the requirement for the casualty to assist or self-recover in any way.

The cradle performs a parbuckling recovery technique using a 2:1 mechanical advantage lift, enabling a controlled transfer from water to deck in a continuous, with stabilised movement which reduces manual loading on the crew.

No crew entry into the water is required at any stage, and no manual lifting of the casualty is undertaken at the vessel side. The recovery is completed as a structured sequence from initial contact through to deck-level transfer.

Outcome of the Man Overboard Rescue (Updated System):

During the drill, the recovery begins in the same way as the previous legacy scenario, with the casualty initially supported using a lifebuoy and recovery line to gain contact and bring them within range of the vessel. However, instead of relying on vessel-side handling and physical intervention at the hull, control of the recovery is then transferred to the extendable cradle recovery pole.

This is the key change compared to the earlier drill. 

The cradle recovery pole allows the crew to actively manage the casualty’s position in the water from a distance, from the deck of a high-sided vessel with a freeboard of approximately 3m. This removes the need for the casualty to be physically dragged, held at the hull, or supported through improvised crew intervention at the vessel side.

Once the casualty is alongside, the man overboard cradle provides full-body support and secures them in a stable, horizontal position. This is a clear contrast to the legacy approach, where the casualty was required to use a ladder or scramble net, or where recovery depended on manual lifting and crew entering the water to assist.

By establishing controlled support earlier in the recovery sequence, the system reduces continued movement in the water and limits exposure time, which is particularly relevant in cold water immersion scenarios and where casualty condition may deteriorate rapidly. The horizontal cradle position also provides a more medically appropriate posture for an unconscious casualty during transfer.

From this point, the parbuckling system (mob cradle) provides a controlled 2:1 mechanical lift from waterline to deck level. The casualty remains stabilised throughout, reducing exposure time and improving consistency of recovery outcome.

This replaces the physically demanding and unstructured lifting seen in the legacy drill, where recovery relied on crew strength, improvisation, and additional in-water assistance.

Overall, the recovery shifts from a reactive, manual process to a structured and repeatable system. Crew workload is reduced, casualty stability is improved throughout, and the need for in-water intervention is removed entirely.

When the two man overboard drills are compared under the same vessel conditions, the key difference is not the equipment carried onboard, but the level of control achieved throughout the recovery sequence.

In the initial (legacy) drill, recovery remains dependent on vessel-side intervention. The casualty is brought alongside using a lifebuoy and recovery line, but the process quickly breaks down at the point of transfer.

The scramble net and ladder rely on the casualty being able to assist, which is not possible in an unconscious or incapacitated state. As a result, recovery becomes manual, reactive, and heavily dependent on crew strength, with at least one instance requiring a crew member to enter the water to stabilise the casualty. The process is slow, physically demanding, and introduces additional risk during the most critical phase of the recovery.

In contrast, the updated system maintains control earlier in the sequence and removes reliance on vessel-side-only handling.

The casualty is still initially located and supported using the same early-stage response, but control is then transferred to the extendable cradle recovery pole at distance. This allows the casualty to be guided directly into a stabilised cradle position in the water, without requiring ladder access or physical handling at the hull.

From this point, the recovery becomes mechanically controlled. The cradle provides full-body, horizontal support, and the parbuckling system enables a 2:1 assisted lift from waterline to deck. The need for manual lifting, in-water crew intervention, or casualty self-assistance is removed entirely.

The outcome is a fundamentally different recovery profile:

• legacy recovery is dependent on manual effort at the vessel side, with limited control over the casualty during transfer
  
• updated recovery is controlled from distance, stabilised in-water, and mechanically lifted in a continuous sequence

Both systems achieve recovery under ideal conditions. However, only one provides a repeatable method that maintains control across the full recovery sequence, particularly in this case:

• casualty is immobilised, meaning the person in the water is unconscious, injured, suffering from cold water exposure, exhausted, or otherwise unable to assist with their own recovery by climbing, holding position, or following crew instructions.
  
• vessel-side access is restricted, where freeboard height, hull shape, bulwarks, fendering, or vessel movement make it difficult for crew to safely reach, stabilise, and transfer the casualty once alongside the vessel
  
• crew is limited, where the number of available personnel onboard is small, reducing the ability to carry out heavy manual lifting, maintain casualty control, or safely manage simultaneous recovery tasks at the vessel side

This distinction is critical in operational terms. The limitation in the legacy approach is not the absence of equipment, but the absence of a structured system that manages the transition from water to deck in a controlled and repeatable way under real operating conditions, which may often be unpredictable.