The maritime industry is approaching one of the most significant changes to electronic navigation since the introduction of ECDIS and S-57 Electronic Navigational Charts (ENCs).

ECDIS Ltd’s 2026 technical report, “Operational Evaluation of S-100 Products and Industry Recommendations,” provides an unusually practical look at what that transition could mean on the bridge. Rather than evaluating S-100 solely from a technical or standards perspective, the study focused on how professional mariners actually interact with the new data products during realistic navigation scenarios.

The scale of the project is notable: 100 seafarers of varying ranks and experience, 10 ECDIS manufacturers, approximately 1,000 hours of assessed pilotage/coastal operations, and 20 comprehensive BRM/BTM scenarios comparing S-100 with S-57.

The results suggest that S-100 has significant potential to improve situational awareness and provide bridge teams with better information—but they also reinforce an important point: more information does not automatically mean safer navigation.

What Makes S-100 Different?

For decades, S-57 ENCs have provided the foundation for ECDIS navigation. S-57 introduced intelligent chart objects, safety contours, route checking, anti-grounding alarms, electronic chart updates and integration with bridge sensors.

However, S-57 was primarily designed around the electronic navigational chart itself. The next generation of navigation requires ECDIS to handle much more than relatively static chart information.

S-100 provides a framework capable of integrating multiple interoperable hydrographic, environmental and navigational datasets into the ECDIS environment. The report describes this as a move away from a single-product navigation system toward a digital maritime information ecosystem.

Among the products evaluated during the trials were:

• S-101 – Electronic Navigational Charts
• S-102 – Bathymetric Surface
• S-104 – Water Level Information
• S-111 – Surface Currents
• S-124 – Navigational Warnings
• S-128 – Catalogue of Nautical Products
• S-129 – Under Keel Clearance

Instead of consulting separate sources for bathymetry, tides, currents, navigational warnings and UKC information, the S-100 concept allows these datasets to work together within a compatible navigation environment.

That interoperability may ultimately prove to be S-100's greatest advantage.

The Biggest Finding: S-100 Becomes More Valuable When Products Work Together

One of the report's most significant conclusions was that the operational value of S-100 increased when multiple products were used together. Participants consistently reported greater benefit from combining S-101, S-102, S-104, S-111, S-124 and S-129 than from using any one product independently.

This is important because S-100 should not simply be viewed as a new ENC format.

Imagine a bridge team approaching a restricted port. Instead of looking at an ENC and then separately determining tidal height, reviewing available depth information, evaluating currents and checking navigational warnings, an S-100-capable environment could bring those datasets together.

The result is potentially a much more complete picture of what is happening around the vessel.

The simulator trials found improvements in route planning, harbour approaches, situational awareness and Under Keel Clearance assessment. Instructor evaluations were particularly positive regarding environmental information: it received 100% positive ratings with a mean score of 4.80, while situational awareness received 90% positive ratings with a mean of 4.60.

S-102 and S-129 Stand Out

Not every S-100 product was viewed equally.

The overall participant ranking placed S-102 Bathymetric Surface first, S-129 Under Keel Clearance second and S-104 Water Level Information third. Interestingly, however, participants identified S-101 as the preferred product for initial implementation because of its similarity to existing S-57 navigation practices.

That distinction is important.

The product offering the greatest perceived operational benefit is not necessarily the easiest product for crews to adopt first.

S-102, for example, can provide navigators with much more detailed information about seabed morphology than a conventional ENC. For vessels operating in restricted waters or with limited UKC, that information could significantly improve the navigator's understanding of the available water beneath and around the vessel.

But the report also found areas requiring improvement. S-102 received strong ratings for seabed understanding and overall usefulness while receiving weaker ratings for aspects of display quality and harbour-area interpretation.

This illustrates a recurring theme throughout the study: better data still requires effective presentation.

Human Factors May Be the Biggest Challenge

Perhaps the most important findings in the report concern the human element.

The human-factors section produced 57% positive responses overall, but that figure masks a more complicated result. Participants were highly positive about situational awareness and workload in some areas while expressing concerns about information overload and bridge-team communication.

Nearly every debrief reportedly included discussion about display clutter. Concerns included too many active layers, excessive warning symbols, dense current vectors and reduced chart readability. Participants therefore recommended that future ECDIS allow navigators to tailor information according to the current phase of navigation.

This could become one of the defining issues of next-generation ECDIS design.

An ECDIS capable of displaying seven or more S-100 datasets simultaneously does not necessarily need to display all of them all of the time.

During an ocean passage, the navigator may need one combination of information. During coastal navigation, another combination may be appropriate. During a restricted-water harbour approach, high-resolution bathymetry, water levels and UKC information may suddenly become critical.

The challenge for ECDIS manufacturers will therefore be to make sophisticated information available without overwhelming the navigator.

Training Will Be Essential

The report strongly supports a phased, human-centred transition to S-100.

Participants specifically cautioned against introducing every S-100 product simultaneously. Instead, the report recommends beginning with the more familiar S-101 environment and progressively introducing specialized products dealing with bathymetry, environmental conditions, tides and UKC.

Training will also need to go beyond teaching mariners where buttons and menus are located.

Future S-100 training should teach navigators how to:

• determine which datasets are appropriate for each navigational situation;
• configure S-100 layers effectively;
• recognize and manage information overload;
• understand the limitations and reliability of dynamic data;
• incorporate new information into passage planning and UKC assessments; and
• maintain effective Bridge Resource Management while using increasingly automated decision-support tools.

The report specifically recommends simulator-based familiarisation before operational deployment.

For shipping companies and training institutions, this may be one of the most immediate lessons from the study.

S-100 Should Support the Navigator—not Replace the Navigator

There is also an important caution against assuming that the trial results prove S-100 automatically makes navigation safer or faster.

The study provides evidence of perceived operational benefits, particularly regarding situational awareness, environmental understanding and access to integrated information. However, the report specifically notes that the results do not establish objective reductions in planning time, navigational error or calculation time.

The simulator methodology itself also has limitations. Real-world factors such as long-term crew fatigue, commercial schedule pressure, unpredictable weather, equipment maintenance and company operating culture cannot be completely replicated in a simulator.

Those limitations make continued operational research important as S-100 systems begin appearing aboard vessels.

What Should the Maritime Industry Do Now?

One of the strongest aspects of the ECDIS Ltd report is that it does not treat S-100 implementation as simply an equipment upgrade.

Instead, it identifies three fundamental requirements:

Technology: reliable S-100 products integrated into compliant ECDIS equipment.

Training: competent bridge teams that understand both the technology and its operational application.

Governance: clear company procedures supported by internationally harmonized standards.

According to the report, all three must work together for the full operational benefits of S-100 to be realized.

For vessel operators, that means preparing for S-100 should involve much more than asking whether the vessel's ECDIS can display an S-101 ENC.

Companies should also be considering training requirements, familiarisation, bridge procedures, SMS documentation, display-management policies, cyber and data-management practices, and how additional S-100 information will actually be incorporated into passage planning and navigation.

Key Takeaways

The report points to several conclusions that the maritime industry should pay close attention to:

1. S-100 is much more than a replacement for S-57. It represents a transition toward an integrated maritime information environment.
2. Interoperability is where much of the value lies. The trials found greater operational benefit when multiple S-100 products were combined.
3. High-resolution bathymetry and UKC information were particularly well received. S-102 ranked first overall, followed by S-129 and S-104.
4. S-101 may be the logical starting point. Its similarity to existing S-57 navigation makes it a practical bridge between current and future ECDIS operations.
5. Situational awareness can improve—but display clutter is a genuine risk. User-interface design and intelligent layer management will be critical.
6. Training cannot be an afterthought. Mariners will need to understand not only how S-100 products work but when and how to use them.
7. Implementation should be phased. Introducing multiple unfamiliar datasets simultaneously could create unnecessary workload and complexity.
8. Professional judgment remains essential. S-100 should enhance the bridge team's decision-making—not substitute for competent navigation.

The Next Generation of ECDIS Navigation

Perhaps the best summary of the entire report is its observation that:

“Technology should reduce complexity, not create it.”

That principle should guide the industry's transition to S-100.

The technology offers the possibility of combining ENCs, detailed bathymetry, dynamic water levels, currents, navigational warnings and UKC information into a much more comprehensive navigational picture. But realizing that potential will require thoughtful ECDIS design, standardized data, effective company procedures and—most importantly—properly trained mariners.

ECDIS Ltd ultimately recommends a phased transition, simulator-based familiarisation, user-centred ECDIS interfaces, greater international harmonisation and continued operational research as additional S-100 products become available.

The transition from S-57 to S-100 therefore represents more than the next chart standard. It represents the beginning of a shift from electronic chart navigation toward truly integrated digital navigation.