When vessel owners begin exploring electrification, one question usually appears very early in the discussion.

How much battery capacity will the vessel need?

It is a reasonable question, but it is often approached in the wrong way.

Many assume battery capacity can be estimated from the size of the vessel alone. In reality, battery sizing is driven primarily by how the vessel operates.

Two vessels of similar size may have dramatically different energy requirements depending on their duty cycle, operating environment and mission profile.

Successful battery sizing begins with understanding how energy is used throughout a typical working day.

Understanding the Vessel’s Duty Cycle

Before any battery calculations are performed, engineers need to understand how the vessel operates.

Questions typically include:

• How many hours does the vessel operate each day?
• How often does it leave port?
• What speeds are normally used?
• How much time is spent manoeuvring?
• How much time is spent stationary?
• What auxiliary systems operate throughout the day?
• How frequently can the vessel be recharged?

The answers form the basis of an energy model.

Without this information, battery sizing becomes little more than guesswork.

Energy Demand Is More Important Than Vessel Size

A common misconception is that larger vessels always require larger battery systems.

While vessel size influences energy demand, operational requirements are usually the more significant factor.

For example, a small workboat operating continuously throughout the day may consume considerably more energy than a larger vessel undertaking short and infrequent trips.

Battery capacity should therefore be determined by the vessel’s energy consumption rather than its physical dimensions.

Calculating Daily Energy Consumption

The next step is establishing how much energy the vessel consumes during normal operations.

This typically includes:

Propulsion Loads

Propulsion is often the largest energy consumer on board.

Energy demand will vary depending on:

• Vessel speed
• Hull form
• Sea conditions
• Payload
• Operating profile

Hotel Loads

These include systems such as:

• Lighting
• Navigation equipment
• Communications systems
• HVAC systems
• Control systems

Although individually small, these loads can contribute significantly over long operating periods.

Mission Equipment

Many workboats operate specialist equipment including:

• Cranes
• Winches
• Survey systems
• Pumps
• Scientific equipment

These loads should be included within the overall energy assessment.

Accounting for Operational Reserves

Battery systems should not be sized solely around expected energy consumption.

Operational reserves are essential.

Unexpected delays, adverse weather and changing operational requirements can all increase energy demand.

For this reason, engineers typically include an appropriate reserve margin within the battery sizing process.

This provides additional flexibility and improves operational confidence.

Understanding Battery Usable Capacity

Not all installed battery capacity is available for routine operation.

Battery systems are generally operated within defined limits to support performance and long-term reliability.

For example, a battery system with an installed capacity of 500 kWh may not routinely use the full 500 kWh.

The usable energy available for operation may be lower depending on the battery chemistry, operating strategy and system design.

This distinction is important when developing energy models and evaluating operational capability.

The Role of Charging Infrastructure

Battery sizing should never be considered independently from charging arrangements.

Charging opportunities can significantly influence the required battery capacity.

For example:

• A vessel returning to port multiple times per day may require a smaller battery.
• A vessel operating continuously between charging opportunities may require a larger battery.

The availability of shore power infrastructure often has a direct impact on system design.

In many cases, investment in charging infrastructure can reduce the battery capacity required on board.

Full Electric vs Hybrid Systems

Battery sizing also depends on the selected propulsion architecture.

Fully Electric Systems

A fully electric vessel relies entirely on stored electrical energy.

This generally requires larger battery capacity and suitable charging infrastructure.

Hybrid Systems

Hybrid systems combine batteries with conventional generators or engines.

The battery system may be optimised for peak shaving, low-emission operation or fuel reduction rather than supporting the entire operational profile.

This often allows smaller battery capacities while still delivering meaningful benefits.

There Is No Standard Answer

One of the most important points to understand is that there is no universal battery size for a workboat.

A harbour vessel conducting short daily operations may require a relatively modest energy storage system.

An offshore support vessel operating for extended periods may require significantly greater capacity or a hybrid solution.

Every project must be evaluated against its own operational requirements.

Why Energy Modelling Matters

Battery systems represent a significant investment.

Oversizing increases capital costs and may introduce unnecessary weight.

Undersizing can limit operational capability and create charging challenges.

Accurate energy modelling allows engineers to identify an appropriate balance between performance, operational flexibility and project cost.

It also provides vessel owners with confidence that the proposed solution will support real-world operations.

Final Thoughts

Battery capacity is one of the most important decisions within any vessel electrification project.

However, there is no simple formula based on vessel length or displacement alone.

Successful battery sizing begins with understanding how the vessel operates, how energy is consumed and what charging opportunities are available.

By developing an accurate operational and energy model, owners can make informed decisions that support both technical performance and long-term commercial viability.

The objective is not to install the largest battery possible.

The objective is to install the right battery for the job.

Across the maritime sector, electrification has moved from a future concept to a practical engineering consideration.

Advances in battery technology, increasing fuel costs, emissions regulations and improvements in charging infrastructure are encouraging vessel owners to explore alternatives to traditional propulsion and power systems.

However, one of the most common misconceptions is that vessel electrification begins with selecting batteries.

In reality, successful electrification projects start by understanding how a vessel operates.

Before considering technology solutions, it is important to establish what problem is being solved and whether electrification is the right approach.

Understanding the Objective

Every vessel has unique operational requirements.

Some operators are seeking to reduce fuel consumption.

Others want to lower emissions.

Some wish to improve operational efficiency or reduce maintenance requirements.

In certain cases, electrification may be driven by regulatory requirements or customer expectations.

Clearly defining the objective helps guide every decision that follows.

Without a clear objective, there is a risk of investing in technology that does not deliver meaningful benefits.

Analysing Vessel Operations

The next step is understanding how the vessel is actually used.

Questions that should be considered include:

• How many hours does the vessel operate each day?
• What are the typical duty cycles?
• How much time is spent at low power?
• How much time is spent at full power?
• Where does the vessel operate?
• How frequently does it return to shore?
• What charging opportunities are available?

The answers provide valuable insight into whether full electric operation, hybrid operation or conventional propulsion remains the most practical solution.

Establishing the Energy Demand

One of the most important stages of any electrification study is developing an energy profile.

This involves understanding how much energy the vessel consumes during normal operation.

The assessment typically includes:

• Propulsion loads
• Hotel loads
• Navigation systems
• Communications equipment
• Auxiliary systems
• Mission equipment

By quantifying energy demand, engineers can determine the scale of the electrical system required to support the vessel’s operation.

Evaluating Electrification Options

Electrification is not a single solution.

Several approaches may be appropriate depending on the vessel and its operational profile.

Full Electric

In a fully electric configuration, propulsion and onboard systems are powered entirely by batteries.

This approach is often suitable for vessels with predictable operating patterns and regular access to charging infrastructure.

Hybrid Systems

Hybrid systems combine batteries with conventional generators or engines.

This can provide many of the benefits of electrification while maintaining operational flexibility.

Hybrid solutions are often attractive for commercial workboats and vessels operating over variable duty cycles.

Shore Power Integration

In some cases, significant benefits can be achieved without modifying the propulsion system.

Connecting vessels to shore power while alongside can reduce fuel consumption, emissions and noise within ports and marinas.

Considering Physical Constraints

Electrification projects are not solely about energy calculations.

The physical characteristics of the vessel must also be considered.

Questions include:

• Is sufficient space available for battery systems?
• Can the additional weight be accommodated?
• Are ventilation requirements understood?
• How will equipment be installed?
• Are existing systems suitable for integration?

Understanding these constraints early helps avoid costly redesign work later in the project.

Charging Infrastructure Matters

Many electrification projects focus heavily on onboard equipment while giving less attention to charging requirements.

Charging infrastructure often has a significant influence on project viability.

Factors to consider include:

• Available electrical supply
• Charging duration
• Vessel turnaround times
• Future expansion requirements
• Port infrastructure limitations

A technically successful vessel design may still prove impractical if charging arrangements cannot support operational requirements.

Building a Business Case

Technical feasibility is only one part of the decision-making process.

Operators also need to understand:

• Capital costs
• Fuel savings
• Maintenance impacts
• Operational benefits
• Asset lifespan considerations

A robust electrification study should consider both technical and economic factors.

The objective is to identify solutions that are practical, achievable and commercially viable.

There Is No Universal Solution

One of the key lessons from vessel electrification projects is that every vessel is different.

A solution that works effectively for a harbour workboat may be unsuitable for an offshore support vessel.

Similarly, a battery system designed for one duty cycle may perform poorly under another.

Successful projects are built around operational requirements rather than assumptions.

Final Thoughts

Vessel electrification offers significant opportunities across many areas of the maritime sector.

However, successful projects rarely begin with batteries or charging systems.

They begin with understanding the vessel, its operational profile and the objectives of the owner.

By developing a clear picture of energy demand, operational requirements and technical constraints, vessel owners can make informed decisions about the most appropriate path towards electrification.

The first step is not selecting technology.

The first step is understanding the problem that technology is intended to solve.

Refit projects often begin long before any equipment is installed or drawings are produced.

Before engineers can design modifications, assess equipment integration or develop installation plans, they need a clear understanding of the vessel’s current condition.

This is where a refit survey plays a critical role.

A properly executed survey provides the information required to reduce uncertainty, identify constraints and support informed engineering decisions throughout the project.

Whether the objective is installing new machinery, integrating battery systems, upgrading electrical infrastructure or planning a major refurbishment, the quality of the survey will often influence the success of the entire project.

Why Refit Surveys Matter

Many vessels have undergone years, or even decades, of modifications.

Equipment may have been replaced.

Pipework may have been rerouted.

Additional systems may have been installed.

Temporary solutions may have become permanent fixtures.

As a result, existing drawings do not always reflect the current state of the asset.

Designing modifications without verifying site conditions can introduce unnecessary risk and increase the likelihood of problems during installation.

A refit survey provides the information needed to design around reality rather than assumptions.

Understanding the Project Objectives

Before attending site, engineers first need to understand the scope of the proposed modification.

This helps determine what information should be collected during the survey.

Typical project objectives may include:

• Machinery replacement
• Battery installation
• Shore power integration
• Sensor upgrades
• Communications systems
• Structural modifications
• Accommodation refurbishments

Understanding the project goals ensures the survey captures the information required to support the subsequent design process.

Reviewing Existing Documentation

Prior to boarding the vessel, available documentation is typically reviewed.

This may include:

• General arrangement drawings
• Structural drawings
• Piping diagrams
• Electrical schematics
• Equipment schedules
• Previous modification records

The objective is not to assume the drawings are correct.

Instead, the documentation provides a starting point for understanding the vessel and identifying areas that require verification during the survey.

Physical Inspection of the Vessel

Once on board, engineers conduct a detailed inspection of the areas affected by the proposed modification.

This often includes:

• Machinery spaces
• Equipment rooms
• Technical spaces
• Deck areas
• Structural compartments
• Access routes

During the inspection, engineers assess:

• Available space
• Existing equipment
• Access restrictions
• Structural arrangements
• Cable routing
• Pipe routing
• Maintenance clearances

Photographs and notes are typically collected throughout the survey process.

Capturing Accurate Measurements

Accurate dimensions are essential for successful engineering design.

Depending on the complexity of the project, measurements may be obtained using:

• Traditional surveying methods
• Laser measurement tools
• 3D laser scanning systems

The objective is to ensure engineers have sufficient information to develop designs with confidence and minimise assumptions during later stages of the project.

For larger or more complex modifications, laser scanning is increasingly used to capture detailed spatial information.

Identifying Constraints and Risks

One of the most valuable outcomes of a refit survey is the identification of constraints that may affect the project.

Examples include:

• Limited access routes
• Congested machinery spaces
• Structural obstructions
• Existing equipment conflicts
• Ventilation limitations
• Cable and pipe routing restrictions

Identifying these issues early allows engineers to address them during design rather than during installation.

This can significantly reduce project risk and avoid costly redesign work.

Assessing Future Installation Activities

A successful modification must not only fit within the vessel, it must also be installable.

Engineers therefore consider practical installation challenges during the survey.

Questions may include:

• Can equipment physically reach the installation location?
• Are lifting arrangements available?
• Is temporary removal of equipment required?
• Are structural modifications necessary?
• Will maintenance access remain adequate?

These considerations are often overlooked when relying solely on drawings.

Creating a Digital Reference

Where laser scanning is used, the survey data can be processed into a digital model of the vessel.

This creates a valuable engineering reference that can support:

• Retrofit planning
• Clash detection
• Equipment integration
• Future modifications
• Asset management

The resulting digital twin often continues to provide value long after the initial project has been completed.

Supporting Better Engineering Decisions

The purpose of a refit survey is not simply to collect measurements.

Its primary purpose is to provide engineers with the information needed to make informed decisions.

The better the information available at the start of a project, the lower the likelihood of unexpected issues emerging later.

Accurate survey data reduces uncertainty and improves confidence throughout the design and installation process.

Final Thoughts

Every vessel modification project depends on understanding the asset as it exists today.

While drawings and documentation remain important, they rarely tell the whole story.

A refit survey provides the information needed to verify existing conditions, identify constraints and develop designs that work in the real world.

For many projects, it is the first and most important step towards a successful outcome.

For generations, marine engineering projects have relied on technical drawings.

General arrangements, piping diagrams, electrical schematics and structural drawings remain fundamental tools for vessel design, operation and maintenance. They provide a structured method of communicating engineering information and continue to play a critical role throughout the lifecycle of a vessel.

In recent years, however, digital twins have become increasingly common across the maritime sector. Advances in laser scanning and 3D modelling have made it possible to create highly accurate digital representations of existing assets.

This has led many owners and operators to ask an important question.

Do digital twins replace traditional drawings?

The answer is no.

The most effective projects typically use both.

The Purpose of Traditional Drawings

Engineering drawings are designed to communicate intent.

They show how a vessel was designed, how systems are arranged and how components are intended to function.

Examples include:

• General arrangement drawings
• Structural drawings
• Piping and instrumentation diagrams
• Electrical schematics
• Equipment layouts

These documents remain essential because they provide engineering information in a structured and widely understood format.

Without drawings, design, fabrication and construction activities would become significantly more difficult.

The Limitation of Drawings

The challenge is that drawings represent information at a specific point in time.

Once a vessel enters service, changes begin to occur.

Equipment is upgraded.

Systems are modified.

Pipework is rerouted.

Additional cabling is installed.

Repairs are completed.

Over the course of many years, these changes can accumulate to the point where the documentation no longer reflects reality.

Even well-maintained drawing packages may contain discrepancies between what is shown on paper and what exists on board.

What a Digital Twin Provides

A digital twin focuses on capturing reality.

Using technologies such as laser scanning, engineers can create a highly accurate representation of an existing asset.

Unlike a traditional drawing, which shows how a system was designed, a digital twin shows how it exists today.

The model can include:

• Structural arrangements
• Machinery
• Pipework
• Electrical systems
• Access routes
• Equipment locations

This provides project teams with a reliable reference point for engineering activities.

Where Traditional Drawings Excel

Drawings remain the preferred format for many engineering tasks.

They are particularly effective for:

• Design communication
• Construction documentation
• Fabrication packages
• Regulatory submissions
• Class submissions
• Technical specifications

They provide clear and concise information that can be reviewed, approved and distributed efficiently.

Digital twins do not replace these functions.

Where Digital Twins Add Value

Digital twins are particularly valuable when dealing with existing assets.

Applications include:

Vessel Modifications

Engineers can assess available space and identify potential clashes before installation begins.

Equipment Integration

New machinery, battery systems and sensors can be evaluated within the existing environment.

Retrofit Planning

Design decisions can be based on accurate measurements rather than assumptions.

Asset Management

Operators gain a detailed and up-to-date representation of their asset.

Future Projects

Survey information remains available long after the initial project has been completed.

Why the Best Projects Use Both

Traditional drawings and digital twins serve different purposes.

One communicates design intent.

The other captures physical reality.

When used together, they provide a far more complete understanding of the asset.

For example, a vessel owner planning a machinery upgrade may use:

• Existing drawings to understand system design
• A digital twin to verify current conditions
• Updated drawings to document the final modification

Each tool contributes to a successful project outcome.

The Direction of the Marine Industry

As vessels become more complex and project schedules become more demanding, accurate information becomes increasingly valuable.

Many owners are now viewing digital twins as a long-term asset rather than a project-specific deliverable.

By maintaining accurate digital representations of vessels and infrastructure, operators can improve planning, reduce risk and support future engineering activities more effectively.

At the same time, traditional engineering documentation remains essential and is unlikely to disappear.

The future is not digital twins instead of drawings.

It is digital twins working alongside drawings.

Final Thoughts

Traditional drawings remain one of the foundations of marine engineering.

However, they are only as accurate as the information they contain.

Digital twins provide a way of capturing the current condition of an asset and reducing the uncertainty that often exists when working with older vessels.

The most successful projects use both tools together.

One provides the engineering intent.

The other provides the reality.

When those two align, project teams can make better decisions, reduce risk and deliver modifications with greater confidence.

For decades, vessel surveys have been carried out using tape measures, notebooks, sketches and photographs.

These traditional methods remain an important part of marine engineering and continue to play a role in many projects today. However, as vessel systems become increasingly complex and engineering projects demand greater accuracy, the limitations of manual measurement techniques become more apparent.

While a tape measure may appear to be the most cost-effective survey tool available, the true costs of inaccurate or incomplete information are often hidden until much later in the project.

The Challenge of Working with Existing Vessels

Unlike new build projects, vessel modifications must work within an environment that already exists.

Machinery spaces are often congested.

Pipework has been altered over time.

Additional cabling may have been installed.

Equipment may have been relocated without fully updating the drawings.

In many cases, engineers are attempting to design around a vessel that has evolved significantly since it was originally built.

Capturing accurate information in these environments is essential.

The Problem with Selective Measurements

When conducting a traditional survey, engineers typically collect measurements that appear relevant to the planned modification.

This approach is understandable. Time on board is often limited and surveyors naturally focus on the areas that seem important at the time.

The difficulty is that engineering projects evolve.

Questions arise during design.

New dimensions become necessary.

Potential clashes are identified.

Additional equipment is introduced.

If the required information was not captured during the original survey, engineers may need to return to the vessel to collect further measurements.

Each additional visit adds time, cost and programme risk.

Human Error Is Difficult to Eliminate

Even experienced engineers can make mistakes during manual surveys.

Measurements can be recorded incorrectly.

Reference points may be misunderstood.

Sketches can be interpreted differently by different members of the design team.

Photographs may not clearly show spatial relationships between equipment and structures.

Most projects can tolerate small errors.

Some cannot.

As tolerances become tighter and spaces become more congested, even minor inaccuracies can create significant challenges during installation.

Complex Spaces Are Difficult to Capture

Machinery spaces, equipment rooms and service voids often contain hundreds of individual components.

Recording every pipe, cable tray, support bracket and structural member manually is rarely practical.

As a result, survey information is often simplified.

This may be sufficient for basic planning purposes, but it can create problems when engineers attempt to install new equipment within already crowded environments.

The reality is often more complex than the survey data suggests.

The Cost of Incomplete Information

When information is missing, uncertainty enters the design process.

Engineers begin making assumptions.

Fabricators work with estimated dimensions.

Installation teams arrive expecting conditions that do not exist.

This can lead to:

• Design revisions
• Fabrication changes
• Delayed installations
• Additional site visits
• Increased labour costs
• Extended vessel downtime

These costs frequently exceed the cost of obtaining more accurate survey information at the start of the project.

How Laser Scanning Changes the Process

Modern laser scanning systems capture millions of measurements in a matter of hours.

Instead of collecting selected dimensions, engineers capture the entire environment.

The resulting point cloud creates a permanent record of the vessel as it existed on the day of the survey.

If questions arise later during the design process, engineers can return to the survey data rather than returning to the vessel.

This improves efficiency and reduces project risk.

Choosing the Right Survey Method

Not every project requires laser scanning.

For simple modifications, traditional measurement techniques may provide sufficient information.

The key is understanding the level of risk associated with the project.

As complexity increases, the value of comprehensive survey data increases with it.

Projects involving:

• Battery installations
• Machinery upgrades
• Structural modifications
• Equipment integrations
• Major refits

often benefit significantly from more advanced survey techniques.

Better Information Leads to Better Decisions

Successful engineering projects are built on reliable information.

The more accurately an asset is understood, the more effectively engineers can design, coordinate and deliver modifications.

While tape measures will always remain a useful tool, modern marine projects increasingly demand a level of accuracy and detail that traditional methods struggle to provide on their own.

Final Thoughts

The cost of measuring a vessel with tape measures is rarely found in the survey itself.

It appears later through assumptions, uncertainty, redesign work and installation challenges.

For many projects, investing in accurate survey data at the beginning is one of the simplest ways to reduce risk and improve project outcomes.

Good engineering starts with good information.

Retrofitting equipment onto an existing vessel is rarely as straightforward as it appears on paper.

Whether the project involves installing battery systems, upgrading machinery, adding communications equipment or integrating new sensors, success depends on having an accurate understanding of the vessel as it exists today.

Unfortunately, many modification projects still begin using outdated drawings, incomplete records and manual measurements. While this may appear to save time initially, it often creates avoidable risks later in the project.

Here are five of the most common issues encountered when retrofit projects proceed without an accurate vessel survey.

1. Equipment Does Not Fit the Available Space

One of the most frequent challenges during retrofit projects is discovering that the available space is different from what the drawings suggest.

Over the life of a vessel, equipment may have been replaced, relocated or modified. Pipework and cabling are often rerouted to suit operational requirements, while temporary modifications sometimes become permanent installations.

A design that appears achievable in the office can quickly become problematic once equipment arrives on site.

The result may be redesign work, installation delays and additional project costs.

2. Unexpected Clashes Are Discovered During Installation

Marine engineering projects are often constrained by limited space.

Even relatively small equipment upgrades can create conflicts with:

• Existing pipework
• Cable trays
• Ventilation systems
• Structural members
• Access routes
• Maintenance clearances

When these clashes are identified late in the project, engineering teams are forced to make changes during installation rather than during design.

Resolving issues in the field is almost always more expensive than identifying them beforehand.

3. Fabrication Errors Increase

Fabrication relies on accurate dimensions.

If measurements are incomplete or based on outdated information, fabricated supports, foundations and pipework assemblies may not align with the actual vessel structure.

This can lead to:

• Rework
• Additional fabrication costs
• Installation delays
• Extended vessel downtime

Accurate survey data provides confidence that fabricated components will fit as intended when delivered to site.

4. Project Costs Become Difficult to Predict

Uncertainty is one of the largest drivers of project cost.

When engineers do not have reliable information about the vessel, assumptions are introduced into the design process.

Some assumptions may prove correct.

Others may not.

As the project progresses, unforeseen issues emerge and budgets begin to move.

Accurate survey information reduces uncertainty and improves confidence in project planning, procurement and installation activities.

5. Future Modifications Become More Difficult

A retrofit project should not only solve today’s problem.

It should also improve the quality of information available for future engineering work.

Without accurate documentation, the same challenges often reappear during subsequent modifications.

Operators find themselves repeatedly measuring spaces, verifying dimensions and investigating undocumented changes.

By capturing accurate survey data and developing an up-to-date digital model, owners create a valuable engineering resource that supports future projects throughout the life of the asset.

The Value of Modern Survey Techniques

Advances in laser scanning technology have transformed the way retrofit projects are planned.

Millions of measurements can be collected in a relatively short period of time, creating a detailed representation of the vessel and its systems.

Engineers can then design modifications around verified information rather than assumptions.

This improves design quality, reduces project risk and helps avoid costly surprises during installation.

Investing in Certainty

Survey work is sometimes viewed as an optional project cost.

In reality, it is often one of the most effective ways of reducing risk.

The cost of capturing accurate information is typically small when compared to the expense of redesign work, fabrication changes, installation delays or extended vessel downtime.

For many retrofit projects, an accurate survey is not simply a useful exercise. It is the foundation for successful engineering.

Final Thoughts

Most vessel modification projects involve working within assets that have evolved over many years of operation.

Drawings may no longer reflect reality, undocumented changes may exist and available space is often more constrained than expected.

Starting with accurate survey data provides engineers with the information needed to design with confidence, minimise risk and deliver successful retrofit projects.

Before planning your next modification, it is worth asking a simple question:

Do you know exactly what is on board today?

Digital twins have become one of the most discussed technologies in engineering, yet the term is often misunderstood.

Some view a digital twin as simply a 3D model. Others associate it with advanced monitoring systems and real-time operational data. In reality, a digital twin can take many forms depending on the requirements of the asset and its owner.

For the marine industry, a digital twin provides a reliable digital representation of a vessel, offshore asset or marine infrastructure. It creates a foundation for engineering, maintenance and future decision making based on accurate information rather than assumptions.

Understanding the Concept

At its simplest, a digital twin is a digital representation of a physical asset.

For marine applications, this may include:

• Vessel structure
• Machinery
• Pipework
• Electrical systems
• Tanks
• Accommodation spaces
• Deck equipment
• Instrumentation

The digital model can be developed using information from existing drawings, engineering data and, increasingly, high-resolution laser scanning.

Unlike traditional drawings, a digital twin represents the asset as it actually exists today.

Why Traditional Documentation Falls Short

Many vessels operate for decades and undergo numerous modifications throughout their service life.

Equipment is replaced.

Pipework is rerouted.

Electrical systems are upgraded.

New technologies are integrated.

While these changes may be documented, records are often incomplete or spread across multiple drawing revisions.

Over time, discrepancies emerge between the documentation and the physical asset.

This can create significant challenges when planning maintenance activities, equipment upgrades or major refit projects.

Building a Digital Twin

The process typically begins with data capture.

Modern laser scanning technology can collect millions of measurements across a vessel, creating an accurate point cloud representation of the asset.

This data is then processed and used to generate digital models that can be referenced by engineers, operators and project teams.

Depending on project requirements, the digital twin may range from a simple survey model through to a fully integrated engineering model containing equipment information, asset registers and operational data.

Applications Across the Asset Lifecycle

Digital twins support a wide range of engineering activities.

Retrofit Planning

Before installing new equipment, engineers can assess available space, access routes and potential clashes within the digital environment.

Equipment Integration

Battery systems, machinery upgrades, sensors and communications equipment can be incorporated into the model before any physical work begins.

Maintenance Planning

Maintenance teams can review equipment locations, access requirements and surrounding systems without requiring repeated site visits.

Asset Management

Digital twins provide a central source of information that can be updated throughout the life of the asset.

Future Modifications

As additional projects are undertaken, the digital model becomes an increasingly valuable engineering resource.

The Value of Accurate Information

Engineering decisions are only as good as the information available.

When project teams rely on outdated drawings or incomplete records, uncertainty increases and risk follows.

Accurate digital representations reduce that uncertainty.

They provide engineers with confidence that designs are being developed around the vessel as it exists today rather than as it was originally built.

Looking Ahead

Digital twins are becoming increasingly common across the maritime sector as operators seek to improve efficiency, reduce project risk and manage assets more effectively.

While the technology continues to evolve, the principle remains simple.

Better information leads to better decisions.

For vessel owners, operators and project teams, a well-developed digital twin provides a practical and valuable foundation for engineering activities throughout the life of an asset.

Final Thoughts

Digital twins are not simply about creating impressive 3D models.

Their real value lies in providing accurate information that supports engineering, maintenance and operational decision making.

Whether planning a vessel modification, machinery upgrade or long-term asset management strategy, a digital twin helps ensure decisions are based on reality rather than assumption.

Why Most Vessel Drawings Are Wrong (And Why It Matters)

Walk aboard almost any vessel that has been in service for more than a few years and there is a good chance that the drawings no longer reflect reality.

Machinery has been replaced. Pipework has been rerouted. New electrical systems have been installed. Equipment has been moved to suit operational requirements. Small changes accumulate over time until the vessel that exists today is significantly different from the vessel shown on the original drawings.

For owners, operators and shipyards, this can create major problems when planning modifications, upgrades or maintenance work.

The Reality of Operational Vessels

No vessel remains unchanged throughout its service life.

Even relatively minor modifications can have a significant impact on the accuracy of engineering documentation. New pumps, additional cabling, communications equipment, battery systems, sensors and structural modifications are often installed over many years.

In many cases the drawings are updated inconsistently, if at all.

As a result, engineering teams frequently arrive on site believing they understand the available space, routing options and equipment locations, only to discover that the reality is very different.

Why Inaccurate Drawings Become Expensive

The consequences of relying on outdated information are often underestimated.

Common issues include:

• Fabricated components that do not fit
• Unexpected clashes between equipment and existing structures
• Delays during installation
• Additional site visits
• Increased labour costs
• Programme overruns
• Reduced confidence in project planning

A design that appears straightforward in the office can quickly become complex when engineers encounter undocumented changes on board.

For vessel owners, these issues ultimately translate into increased project costs and operational disruption.

The Traditional Approach

Historically, modifications were often developed using a combination of:

• Existing drawings
• Manual measurements
• Site sketches
• Photographs

While these methods remain useful, they are heavily dependent on the quality of the original documentation and the experience of the survey team.

For simple projects this may be sufficient.

For larger modifications, electrification projects, machinery upgrades or equipment integrations, the risks increase significantly.

A More Accurate Solution

Modern laser scanning technology allows vessels to be captured in exceptional detail.

Millions of measurement points can be collected within a matter of hours, creating an accurate digital representation of the asset as it exists today.

The resulting point cloud provides engineers with a reliable foundation for design work and can be converted into detailed 3D models where required.

Rather than designing around assumptions, projects can be developed around verified information.

Benefits Beyond Design

The value of an accurate digital model extends beyond a single project.

Digital vessel models can support:

• Retrofit planning
• Equipment integration
• Clash detection
• Future modifications
• Asset management
• Maintenance planning
• Documentation updates

For operators managing complex assets, accurate digital information becomes increasingly valuable over the life of the vessel.

Reducing Risk Before It Becomes Cost

Most engineering problems are significantly cheaper to solve before fabrication begins.

By investing in accurate survey data at the start of a project, owners and operators can reduce uncertainty and improve decision making throughout the design process.

Whether the objective is installing new equipment, integrating battery systems, upgrading machinery or planning a major refit, understanding the vessel as it exists today is often the most important first step.

Final Thoughts

Many marine projects begin with drawings that no longer reflect reality.

The question is not whether a vessel has changed over time. The question is whether those changes have been properly captured.

Before committing to a modification, upgrade or retrofit project, it is worth considering whether the information being used is accurate enough to support the decisions that follow.

Accurate survey data provides the confidence to engineer with certainty, reduce project risk and deliver successful outcomes.