We are Seaquence.
We enable Ocean industries
to Work with the Ocean.
To do this, we are building Sea4D.
Sea4D: Live Active AI Awareness for the Ocean.
Sea4D builds a live digital twin of the sea around a vessel or Ocean infrastructure, linking the vessel or structure to its operating environment. One tool gives the awareness that enables safer operations, improved efficiency, reduced fuel consumption and emissions, demonstrable compliance and lower cost, with clear operational value.
The Sea4D platform deploys to vessel, infrastructure or task equipment. Sensor fusion led by imaging radar gives Ocean industries foresight: it measures the sea state, detects, tracks and classifies the vessels and objects in the sea within 1,000 m, and flags when the satellite position should not be trusted, for safer, more efficient and compliant marine operations.
Built for Ocean Energy, Ocean Infrastructure, Global Shipping and Defence & Security.
01 · The Challenge
Demand on the Ocean has never been higher.
The Ocean is our greatest ally in the climate fight, absorbing more than 90 per cent of the planet's excess heat.
Every Ocean industry now depends on working with it safely and efficiently.
02 · The Race for Ocean Space
Every Ocean industry is expanding to meet it.
Ocean industries move over 80% of world trade and generate the energy the planet needs.
Denser traffic, mandated decarbonisation, crew shortages, autonomous operations and GNSS interference ask more of every decision made at sea.
To keep delivering, they need to Work with the Ocean.
$3 trillion market, 40 million jobs, by 2030. OECD.
Demand for Ocean space is forecast to grow five-fold by 2050. DNV, 2023.
02 · The Race for Ocean Space
Every Ocean industry is expanding to meet it.
Ocean industries move over 80% of world trade and generate the energy the planet needs.
Denser traffic, mandated decarbonisation, crew shortages, autonomous operations and GNSS interference ask more of every decision made at sea.
To keep delivering, they need to Work with the Ocean.
$3 trillion market, 40 million jobs, by 2030. OECD.
Demand for Ocean space is forecast to grow five-fold by 2050. DNV, 2023.
03 · The Problem
Operating at sea means reacting as conditions change.
Those conditions are least understood where it matters most, in the direct zone: the sea within 1,000 m of a vessel or Ocean infrastructure. Situational awareness is most critical here, and gains in efficiency, workability and safety depend on it.
The rules already mark this water out. SOLAS allows the sea ahead of a ship’s bow to be hidden from the bridge for up to two ship lengths or 500 m, while the operator of Ocean infrastructure is expected to monitor a safety zone of up to 500 m and evidence infringements.
SOLAS Chapter V, Regulation 22. MCA, MGN 654.
SEA STATE
Forecast, or measured at fixed points and read on separate screens. The uncertainty carries into every downstream decision.
WORKABILITY
Decided on forecast margins and on a wave height alone, when the period and direction of the waves also change how a vessel moves.
8.2 days
a month on average when weather made UK offshore wind farms inaccessible.
ORE Catapult and The Crown Estate, SPARTA Portfolio Review 2020/21.EFFICIENCY
Routed and trimmed without measurement.
3 to 10%
efficiency gain from forecast-based weather routing, to be verified in operation.
DNV, Energy-Efficiency Measures and Technologies, 2025.COLLISION RISK
Managed by visual and radar watchkeeping. Close aboard in a seaway, the control that suppresses sea clutter can also suppress small targets.
52%
fewer high-severity close encounters using AI-assisted systems, across 139 container ships over 12 months.
NorthStandard P&I Club, April 2026.IDENTIFICATION
AIS identifies only the vessels that transmit, and identification of small craft and objects in the water depends on the visual lookout.
POSITION INTEGRITY
Reliant on continuous GNSS. The consequence of a position error is greatest close to structures and the shore.
13,000+
vessels GPS-jammed in one quarter
Windward.Resolving them with measurement makes work safer, reduces cost, strengthens operations and improves efficiency, with the evidence to meet regulation and consents.
Sea4D
Sea4D. One Platform to Work with the Ocean.
Sea4D builds a live digital twin of the sea around a vessel or Ocean infrastructure, linking the vessel or structure to its operating environment. The twin models how the vessel or structure interacts with the sea, with other vessels and hazards in the water, and with its own position, so users can adapt as conditions change. Where there is connectivity, all data is backed up to the cloud for a live feed ashore, playback and audit. Understanding that interaction enables Ocean industries to solve the challenges they face: decarbonisation, efficiency, safety, compliance and cost.
Sea4D
Sea4D. One Platform to Work with the Ocean.
Sea4D builds a live digital twin of the sea around a vessel or Ocean infrastructure, linking the vessel or structure to its operating environment. The twin models how the vessel or structure interacts with the sea, with other vessels and hazards in the water, and with its own position, so users can adapt as conditions change. Where there is connectivity, all data is backed up to the cloud for a live feed ashore, playback and audit. Understanding that interaction enables Ocean industries to solve the challenges they face: decarbonisation, efficiency, safety, compliance and cost.
| Capability | Function | Outcome |
|---|---|---|
| WAVE FIELD | Wave height, period and direction at the point of work. Wave spectra and other measurements are in development, using the unit’s GPU processing. | Enables operational windows on the measured sea state, in place of a separate wave buoy or wave radar. Images the sea surface close in, in detail down to 4 cm. |
| POSITION INTEGRITY | Position integrity when GNSS is denied. Flags when the satellite position should not be trusted. | Enables safer operations through jamming, spoofing and signal loss. Keeps positioning running in ports, terminals and strategic waterways when satellite navigation is degraded or denied. |
| WORKABILITY | Relative motion at the transfer point. In development: the sea state ahead of the vessel. | Enables uptime, fewer cancellations and audit-ready warranty records. On a 15 MW turbine, each day of recovered output is worth about £12,500 to £16,000 at today’s strike price. A go or no-go at the point of work against the operation’s own limits in wave height and period, drawn from the measured sea state, shown on Foresight. |
| OPTIMAL CTS | AI course and speed advice at the edge. Computed live on the unit for the bridge. | Enables lower fuel burn and emissions. DNV puts the efficiency gain from forecast-based weather routing at 3 to 10 per cent, to be verified in operation, and each per cent of fuel saved lowers the ship’s attained CII by about one per cent. On small craft, fuel and transit time; on large ships, heavy-weather advice alongside existing weather routing. |
| AI OBJECT ID | Radar-first sensor fusion. Radar leads, AI identifies each track and the camera confirms. | Enables detection through fog, spray and darkness. 52% fewer high-severity close encounters using AI-assisted systems (NorthStandard P&I Club, April 2026). Small craft and objects in the water, such as marine mammals, a man overboard or hazards, detected and tracked in sea clutter close aboard. Radar leads because maritime conditions degrade cameras long before they degrade radar. |
WAVE FIELD
Wave height, period and direction at the point of work.
Wave spectra and other measurements are in development, using the unit’s GPU processing.
Enables operational windows on the measured sea state, in place of a separate wave buoy or wave radar.
Images the sea surface close in, in detail down to 4 cm.
POSITION INTEGRITY
Position integrity when GNSS is denied.
Flags when the satellite position should not be trusted.
Enables safer operations through jamming, spoofing and signal loss.
Keeps positioning running in ports, terminals and strategic waterways when satellite navigation is degraded or denied.
WORKABILITY
Relative motion at the transfer point.
In development: the sea state ahead of the vessel.
Enables uptime, fewer cancellations and audit-ready warranty records. On a 15 MW turbine, each day of recovered output is worth about £12,500 to £16,000 at today’s strike price.
A go or no-go at the point of work against the operation’s own limits in wave height and period, drawn from the measured sea state, shown on Foresight.
OPTIMAL CTS
AI course and speed advice at the edge.
Computed live on the unit for the bridge.
Enables lower fuel burn and emissions. DNV puts the efficiency gain from forecast-based weather routing at 3 to 10 per cent, to be verified in operation, and each per cent of fuel saved lowers the ship’s attained CII by about one per cent.
On small craft, fuel and transit time; on large ships, heavy-weather advice alongside existing weather routing.
AI OBJECT ID
Radar-first sensor fusion.
Radar leads, AI identifies each track and the camera confirms.
Enables detection through fog, spray and darkness. 52% fewer high-severity close encounters using AI-assisted systems (NorthStandard P&I Club, April 2026).
Small craft and objects in the water, such as marine mammals, a man overboard or hazards, detected and tracked in sea clutter close aboard. Radar leads because maritime conditions degrade cameras long before they degrade radar.
The Demand
More infrastructure stands in the Ocean than at any point in history, and demand for Ocean space is forecast to grow five-fold by 2050 (DNV). Mandated decarbonisation and crew shortage in shipping, tightening consents and the levelised cost of energy in offshore wind and infrastructure, and the arrival of autonomy across all of them now resolve to the same five demands for every Ocean industry.
We built the SCORE framework to make sure Sea4D answers them:
S
SAFETY
Better perception makes work safer. Sea4D is designed to warn of a closing vessel, an allision risk or a man overboard in time to act, in fog, spray and darkness.
C
COST
Fewer incidents, less downtime and lower fuel burn take cost out across the whole operation.
O
OPERATIONS
Sea state measured at the point of work strengthens operations, recovering workable days and raising utilisation.
R
REGULATION
Continuous monitoring produces audit-ready evidence for regulation and consents: carbon intensity (CII), resilient positioning (IMO PNT) and collision/allision risk.
E
EFFICIENCY
Course and speed advice and fewer wasted transits cut fuel and emissions. DNV puts the efficiency gain from forecast-based weather routing at 3 to 10 per cent, to be verified in operation.
SCORE is Seaquence's own framework, and it runs through the business. Every product is designed, built and judged on safety, cost, operations, regulation and efficiency, and we hold the company to the same five measures.
Technology
Sea4D Technology Built to Work with the Ocean.
Radar
4 cm
Range detail close in.
Down to 4 cm close in, and finer than a metre to 100 m: the detail that man-overboard response and marine mammal detection depend on.
Edge Computing
Under 65 W
Every measurement is made on the unit, so it keeps working without connectivity to shore.
Small Targets
Tracked in sea clutter
Sea4D is designed to detect and track small craft and objects in the water, such as marine mammals, a man overboard or hazards, close aboard, where a navigation radar's clutter control can also suppress them.
That supports man-overboard response, marine mammal mitigation and safe passage clear of debris.
Processing
10 Hz
The contact picture, the sea state and the position status update ten times a second on the unit, so the crew sees a closing contact or a change in sea state as it happens.
Predictive Wave
In development
The sea state ahead of the vessel, for transfer timing and for foiling and high-speed craft.
Operating Interface
Foresight
A live digital twin of the sea within 1,000 m: the measured sea state and the vessels, small craft and objects on it, with a go or no-go at the point of work.
Where there is connectivity, all data is backed up to the cloud for a live feed ashore, playback and audit.
Projected production-unit figures; to be verified in production trials.
WHY A GPU
A conventional marine radar displays the echo and processes it no further. Sea4D runs continuous classification across the whole radar picture, ten times a second. That workload needs a GPU rather than a signal processor, which is why the unit carries the compute it does, and why new capability arrives as a software update rather than new hardware.
WHY SMALL TARGETS SHOW
Conventional marine radar applies a detection threshold to the echo and displays what survives it. A RIB, a piece of floating debris or a man overboard inside sea clutter can fall below that threshold, which is why they are missed. Sea4D is designed to detect and track them, and to give wave height, period and direction from the same unit at the same time. The detection ranges below are what that means in practice.
Learns in service
Perception models are in training on Seaquence's growing radar and camera data, and are delivered to each unit as software updates. Every unit is designed to improve through its service life, where a conventional scanner's performance is fixed when it is made.
Capability by software
Wave field measurement, contact detection and GNSS integrity monitoring run as software on the same on-board computer; the GPU carries them with headroom to spare.
Modular by design
New capability arrives as a software update: task-specific detection models deploy to the same unit, from a protected-species watch on a wind farm to a defined object class on a defence tasking.
The result is the wave field, the contact picture and position integrity from one unit, ten times a second.
Detection Range
The direct zone.
The direct zone is the sea within 1,000 m of a vessel or Ocean infrastructure. Situational awareness is most critical here, and gains in efficiency, workability and safety depend on it. It is also where navigation radar is weakest, because sea clutter is strongest close in. Sea4D monitors that water through fog, spray and darkness, in support of the lookout and the navigation radar.
Projected production-unit figures, from engineering research on the purpose-designed maritime antenna. Mounted on a vessel or on a structure, one Sea4D unit provides:
From a mount 10 m or more above the sea, in clear weather; heavy rain shortens every range, and in higher seas waves hide small objects in the water for part of the time. One unit covers 120°; three units cover a full circle, and full coverage of a zone may need more than one unit.
Cameras lose sight in fog, spray and darkness, and AIS shows only vessels that transmit. Radar keeps its picture through all three.
Radar leads, AI identifies each track and the camera confirms.
Sea4D does not replace SOLAS radar. It supports the navigation radar and the lookout, and keeps its picture where cameras lose sight.
In Operation
Sea4D: one platform for all vessels and Ocean infrastructure.
One unit: radar, thermal, GNSS, IMU and AIS, fused into a single picture.
01
ON THE VESSEL
VESSEL MOUNT
HAZARDS
Ships, small craft and objects in the water
IDENTIFY
AI classification of each track
POSITION
Flags an untrustworthy satellite position; positioning continues in ports, terminals and strategic waterways
Outputs: Foresight · Optimal CTS · Evidence log
02
TASK SPECIFIC ACTIVITIES
TASK MOUNT
TASKS
MOB watch · Transfers · Lifts · DP · Subsea activities
MEASURES
Sea state at the point of work
MOBILISE
Fitted in any orientation, with a heading check at installation. Under 65 W.
Outputs: Detection · Go or no-go · Evidence log
03
ON THE STRUCTURE
STRUCTURE MOUNT
MONITOR
Safety zones, the traffic and objects in the water around the structure
MEASURE
Sea state measured at the asset
DESIGNED WITH REFERENCE TO
Energy Act 2004 · MGN 654 · G+ · IMCA · DNV-ST-N001
Outputs: Workability · Transfer windows · Evidence log
Sectors
Built for every Ocean industry.
Ocean Energy
A 300+ GW offshore wind pipeline to 2035.
Workability, crew transfer safety and assurance evidence from measured sea state at the point of work.
Supporting offshore wind, fixed and floating, floating solar, wave and tidal, from construction through operation: crew transfer, service operations, jack-up, walk-to-work and heavy lift.
Ocean Energy
A 300+ GW offshore wind pipeline to 2035.
Workability, crew transfer safety and assurance evidence from measured sea state at the point of work.
Supporting offshore wind, fixed and floating, floating solar, wave and tidal, from construction through operation: crew transfer, service operations, jack-up, walk-to-work and heavy lift.
Ocean Infrastructure
About 1.7 million km of cable.
Submarine telecommunications cable in 2025 (ICPC). Corridor monitoring, safety-zone collision risk and the MGN 654 evidence record from one unit.
Supporting cable corridors, interconnectors, platforms and offshore compute, from construction through operation.
Ocean Infrastructure
About 1.7 million km of cable.
Submarine telecommunications cable in 2025 (ICPC). Corridor monitoring, safety-zone collision risk and the MGN 654 evidence record from one unit.
Supporting cable corridors, interconnectors, platforms and offshore compute, from construction through operation.
Global Shipping
100,000+ vessels worldwide.
Contact detection through fog, spray and darkness, GNSS resilience and voyage efficiency with auditable CII evidence.
Supporting ports and terminals, harbour tugs and pilot boats, voyage efficiency, CII evidence and autonomous watchkeeping.
Global Shipping
100,000+ vessels worldwide.
Contact detection through fog, spray and darkness, GNSS resilience and voyage efficiency with auditable CII evidence.
Supporting ports and terminals, harbour tugs and pilot boats, voyage efficiency, CII evidence and autonomous watchkeeping.
Defence & Security
32 NATO nations.
Force and asset protection close in, perception for uncrewed platforms and persistent monitoring in contested waters.
Supporting force and asset protection within the direct zone, and perception for uncrewed and new technology, in contested water.
Defence & Security
32 NATO nations.
Force and asset protection close in, perception for uncrewed platforms and persistent monitoring in contested waters.
Supporting force and asset protection within the direct zone, and perception for uncrewed and new technology, in contested water.
One platform for every Ocean industry.
Autonomy & New Propulsion
Enabling what comes next.
Perception and a view of the waves ahead for autonomous, foiling and alternatively powered vessels.
01
AUTONOMOUS SHIPPING
The IMO MASS Code asks for redundant, auditable perception. An uncrewed vessel has no lookout, and cameras are limited in fog, spray and darkness. Sea4D supports detect and avoid with radar-first perception, keeps positioning running in ports, terminals and strategic waterways when satellite navigation is degraded or denied, and backs up its data to the cloud as evidence for certification.
02
FOILING AND HIGH-SPEED CRAFT
A foiling craft above 30 knots has little margin for an unseen wave. Predictive Wave, in development, is designed to show the crew the sea ahead. Sea4D is also designed to detect hazards in the water ahead of the craft.
03
NEW PROPULSION
Electric, hybrid and wind-assisted vessels have little energy to spare. Course and speed advice to the bridge reduces the energy used on each passage, which extends range and reduces emissions.
Next Step
Get in touch.
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