What Is Ocean Tech? The Technologies Behind the Blue Economy

A Saildrone vehicle entering a hurricane makes the point better than a definition. Saildrone builds uncrewed surface vessels that collect ocean data. The US National Oceanic and Atmospheric Administration (NOAA) first reported uncrewed surface vehicles capturing video from inside a hurricane in 2021. For the fourth annual NOAA and Saildrone hurricane mission, Saildrone reported 768 days of data collection, more than 27,000 nautical miles sailed and 16 hurricane intercepts. The product had moved from a striking demonstration into a repeatable operating programme, and the conditions it worked in were part of what the agency was buying. In ocean technology the sea is part of the product.

Ocean tech covers several markets

The ocean economy spans established sectors and emerging technologies. OECD work now describes a trillion-dollar ocean economy, while the European Commission's blue-economy reporting covers areas including shipping, ports, energy, aquaculture, coastal activity and marine research.

Ocean tech sits across that territory. It includes observation and sensing, robotics and autonomy, offshore and ocean energy, aquaculture and blue biotechnology, and technologies that decarbonise shipping and ports.

Those clusters share an environment and very little else. A data platform can scale like software. A wave-energy device may need years of engineering, site work and project finance. An aquaculture tool sells into an operating food business. A shipping retrofit follows vessel dry-dock cycles and regulation. A company can use the ocean label to join the category, and it should move to its deployment model within the first few lines.

1. 01Observation and sensingData about the ocean and what happens in it.
2. 02Robotics and autonomyUncrewed systems that work at sea.
3. 03Offshore and ocean energyWind, tidal and wave power.
4. 04Aquaculture, food and blue biotechFood and materials from marine life.
5. 05Shipping and portsDecarbonising how goods move by sea.

Each market has its own buyers, procurement cycle and evidence standard.

Observation companies sell a better decision

Ocean-observation businesses use sensors, imaging systems, floats, buoys, autonomous vehicles, underwater platforms and software to turn marine conditions into usable information. The buyers include scientists, weather agencies, ports, offshore operators, aquaculture businesses, insurers and regulators, and each pays for a different decision. A forecaster wants better storm information, a port wants safer navigation and an insurer wants a stronger view of physical risk. Public agencies already fund and publish large amounts of ocean data, so a commercial provider has to say what it adds for that buyer through resolution, frequency, coverage, turnaround, site specificity or a model built around one operational decision.

Robotics moves cost and risk out of vessel work

Working at sea is expensive and constrained by weather. Autonomous surface vehicles, underwater vehicles and remotely operated systems can reduce crew exposure, extend coverage and replace some vessel time. The commercial model matters as much as the hardware. A company can sell the vehicle, deliver survey work as a service, or sell the resulting data while retaining the fleet, and those models create different capital requirements and different buying processes.

Deployment cost gives the distinction weight. Vessel rates vary widely by class, contract and region. CMB.TECH reported an average day rate of about $2,883, measured as time-charter equivalent, for the crew transfer vessels in its Windcat fleet in the fourth quarter of 2025, while complex offshore support and heavy-lift vessels can cost many times more. The figure describes one fleet in one quarter. It shows why a product that removes vessel days can create a value proposition a buyer already knows how to price.

The water also sets engineering problems a land robot never meets. Richard Hardiman, founder of RanMarine, which builds autonomous surface vessels that clean plastic, algae and oil from ports, marinas and rivers, described the hardest one in an April 2024 interview. “Normally, vessels would avoid debris, but we were intentionally going into the centre of it, and our thrusters would get caught in balloons and string, causing breakdowns.” RanMarine works where waste enters the sea, in ports, marinas and river deltas, and those are its buyers. He said its larger oil-collecting vessel “can also be used from a maintenance perspective”, picking up the fuel that leaks from diesel boats in small ports and marinas. On the founder’s own account in 2024, a response tool had also become a maintenance tool, which gives a port a reason to buy before any spill happens.

Energy and shipping become infrastructure businesses

Offshore wind is already a large industry. Tidal, wave and ocean-thermal systems remain at earlier stages. In all of them, the technology sits inside sites, permits, seabed rights, grid connection, manufacturing, vessels, installation, operations and finance.

NoviOcean, a wave energy converter developed by Novige AB, shows how long the road between a validated design and a committed partner can be. Jan G. Skjoldhammer of Novige told us in an April 2022 interview that WavEC, the organisation in Portugal he asked to verify the design, analysed his converter and came back with what he called “fantastic numbers”. He expected the large companies he pitched to follow them. They said it was too early, and many grant applications failed. The answer he heard was “We wish you luck. Come back when you’ve achieved this or that.” By the time of the interview the company had grants of more than €2.5 million, covering half the cost of a 500 kW pilot. That is the founder’s account in 2022, before the pilot was built, and it shows where the commercial test sits for ocean energy. Partners waited for performance at sea, and reaching it took grant capital first. The second half of this guide deals with that transition.

Shipping and ports buy technology against long-lived assets. Efficiency systems, alternative fuels, shore power, electrification, routing and emissions measurement all have to fit vessel schedules, port infrastructure, regulation and capital planning. The International Maritime Organization's 2023 greenhouse-gas strategy changed the planning context for shipowners, and a product can still miss the buying window if it leaves out when installation happens, what operational change it requires and how the economics work across the vessel's remaining life.

Aquaculture and blue biotechnology enter existing production systems

Aquaculture technology sells into businesses with biological risk, thin margins and little tolerance for extra operating work. Monitoring, feed, automation, health and traceability products have to connect to yield, labour, mortality, compliance or resource use in language a farm manager already uses.

Blue biotechnology uses marine organisms and biological processes to make food, chemicals, materials, pharmaceuticals and other products. These companies face many of the same commercial questions as industrial biotech. Buyers want a product, specification, price and supply volume, and marine origin becomes strategically useful after those basics are clear. Thibaut Monfort-Micheo, co-founder of the UK seaweed packaging start-up FlexSea, put the problem plainly in a February 2024 interview. “You might think that producing plastic from seaweed is unique enough, given that it doesn't require pesticides, fertiliser, or freshwater. However, the reality is that several other companies are doing the same.” That is one founder describing his own market in 2024. Our reading of the interview is that price sets the frame, because plastics are a commodity with thin margins. Seaweed origin gets FlexSea into the conversation. Whether buyers accept the material at a given price and performance decides it.

Evidence at sea accumulates over seasons

Ocean technology has a particular evidence problem. A laboratory tank, harbour test and short sea trial each prove something useful, and none proves long-duration performance in open water. The Saildrone hurricane programme shows how a stronger evidence base develops. One successful hurricane intercept established that the platform could operate in conditions a crewed vessel should avoid. Repeated seasons, hundreds of operating days and a published record of intercepts showed that the operation could be planned, repeated and integrated into an agency's mission.

That distinction should be visible in ocean-tech communication. We will not describe a sea trial as commercial deployment simply because the hardware survived the water. Serious buyers know the grades, so state the conditions behind each result. Say how long the system ran, at what depth, in what sea state, with what communications and under whose operation. That detail lets a buyer judge whether the result will transfer to their site. A result presented without conditions invites the most sceptical reading. A result with clear limits invites the next trial. Our note on moving from FOAK to NOAK, from a first-of-a-kind deployment to repeatable ones, covers how evidence has to change between the first site and the ones that follow.

Why ocean tech is hard to commercialise

The prototype has to leave a controlled environment and keep working at sea, where access, maintenance, permits and infrastructure can cost as much as the technology. A device that performs in a test tank can still lose money once vessel days, weather windows, corrosion and customer integration enter the numbers. Depending on the technology, a deployed system has to survive salt water, motion, pressure, biofouling, storms, remoteness and changing conditions from one season to the next. Each of these affects hardware design, data quality, maintenance intervals and warranty terms.

The US Department of Energy draws the relevant line in its commercialisation work, which assesses adoption readiness alongside technology readiness. Adoption readiness is the point where a customer can buy, install and run the product. Many ocean tech companies reach technical readiness well before that point, and the gap between the two is where time and cash run out. The partners who told NoviOcean to come back later were describing that gap. The constraints vary by business. A marine data software company may never put hardware in the water, and an offshore energy developer faces almost all of them. Name the ones that apply, so investors and buyers can see the real shape of the risk.

Access, installation and maintenance set the economics

For hardware at sea, the cost of reaching the asset can outweigh small improvements in the asset. A cheaper sensor that needs frequent vessel visits can cost a customer more over a year than an expensive one with long service intervals. Total operating cost belongs in the value story, and component price alone misleads.

Installation is a commercial capability in its own right. The customer's crew, a specialist contractor, a port operator, an offshore services partner or the start-up's own team might do the work. If every deployment needs the founders on a boat, growth stalls even when the technology performs. A commercialisation plan should show how installation becomes routine and who does it at the tenth site.

Maintenance runs for the life of the asset. Remote diagnostics, spare parts, replacement cycles, data connectivity and the service model are part of the proposition, and buyers often care as much about the operating burden as about headline performance. Large public buyers weigh the same burden. NOAA now uses uncrewed systems for hydrographic surveying, which maps water depth and the seabed, work that has long depended on crewed survey ships. A supplier selling into that kind of buyer should expect crew and vessel time to be counted against it.

Permits and infrastructure set the timeline

Projects that occupy marine space need approvals, and the rules differ by country and by technology. Offshore energy, aquaculture, sensing networks, subsea infrastructure and ocean carbon removal each follow their own regulatory path. A single "regulatory risk" line in a deck tells an investor nothing. Name the permits, the authority, the typical timeline and the stage you have reached.

Ocean technology also depends on infrastructure it does not control. Ports, vessels, grid connections, moorings, subsea cables, fuel supply, data networks and coastal facilities can all set the timeline. A product can be ready while the enabling infrastructure is still years away. When that surrounding system changes, commercial readiness can change quickly, which makes infrastructure part of the why-now argument as well as the deployment plan.

The buyer purchases a workflow

An offshore operator buys an inspection outcome, less downtime, lower vessel cost, safer operations or better data. An aquaculture company buys a decision about feeding, stocking or treatment. The robot and the sensor are the means, and the buyer's budget sits against the outcome. Describe what the customer does today, who does it, how often, which asset is involved and what failure costs. Then show how the technology changes the routine. That framing also tells you who owns the budget, which is often a different person from the one who finds the technology interesting.

Capital intensity follows the deployment model

The clusters above finance differently. Wave and tidal energy look like infrastructure. Ocean data software looks like enterprise software. A robotics platform may look like a service business with a fleet on its balance sheet, and many companies combine hardware sales, services and recurring data revenue. The financing model should follow the actual deployment model, and the pitch should say which one it is before the investor has to guess.

Some ocean businesses sell no device at all. Our work with Fair Carbon sat in blue carbon, the carbon held in coastal and marine ecosystems. The barriers there were fragmented knowledge, complex project development and finance that was hard to reach, and they were highest for communities and smaller project developers. Fair Carbon positioned itself as a builder of that market, with separate routes for project developers, buyers, investors and policymakers.

Where hardware dominates, the sums grow quickly. The European Commission's Blue Economy Observatory reports that companies in the European Investment Bank (EIB) Blue Champions pilot estimated financing needs running into billions of euros over the following years. Vessels, grid connections, offshore installation and aquaculture infrastructure create large upfront capital needs while markets are still forming. A prototype story has to grow into a deployment system before it can carry numbers of that size.

A tidal energy example

Tidal stream energy shows how much of commercialisation sits outside the device. SAE Renewables, a tidal energy developer, runs the MeyGen tidal stream project in the Pentland Firth, off the Caithness coast in the far north of Scotland. The turbines have to be designed, and they also have to be installed in fast-moving water, connected to the grid, maintained with specialist vessels and paid for over decades.

The revenue side depends on policy as well as engineering. SAE has secured a Contract for Difference for the MeyGen site under the UK's revenue support scheme for low-carbon power, which fixes the price the generator receives for its power over the contract term. That contract is a commercial mechanism outside the turbine. For an investor, the existence and terms of that kind of support are as material as the device's performance, and a tidal company's story has to explain both.

From prototype story to deployment story

Answer these questions in order before you revise a deck or website. Each unanswered one marks the next piece of commercial work.

1. What operating problem exists, and for whom.
2. What the current workflow costs.
3. What the technology changes in that workflow.
4. What deployment requires, including vessels, sites and people.
5. What evidence exists from representative conditions.
6. Which installation and maintenance model scales past the first sites.
7. Which approvals and infrastructure set the timeline.
8. What the customer buys, and who owns the budget.

Vessels, permits, sites, maintenance, weather windows and communications constraints should appear early whenever they shape cost or adoption. The ocean-tech category then locates the company in the blue economy and helps investors see a wider field, after the commercial description has told the buyer what they can use. A technology can work well and still fail commercially because the work around it is too slow, costly or hard to operate. The story that raises money names those constraints and gives each one a plan. For how to adapt that story to investors, buyers and partners, read how to position climate tech.

A useful evidence standard is still the hurricane mission. The memorable image is the vehicle inside a storm. The operating evidence is the 768 days, 27,000 nautical miles and 16 intercepts that came after it.

When the deployment plan is sound and the pitch reads like a lab report, that is pitch deck work, and we do it.

Sources and further reading

• OECD on the trillion-dollar ocean economy, 2025
• EU Blue Economy Report, European Commission, 2025
• World first as ocean drone captures video from inside a hurricane, NOAA
• NOAA and Saildrone hurricane mission results
• Windcat vessel market data, CMB.TECH, 2026
• Richard Hardiman, RanMarine, founder interview, 2024
• Jan G. Skjoldhammer, NoviOcean, founder interview, 2022
• Thibaut Monfort-Micheo, FlexSea, founder interview, 2024
• Commercialization and Pathways to Commercial Liftoff, US Department of Energy
• Adoption Readiness Assessment, US Department of Energy, 2024
• Uncrewed systems for hydrographic surveying, NOAA
• Research and innovation, EU Blue Economy Observatory, European Commission
• European Blue Champions, charting the course for innovation finance, European Investment Bank, 2025
• SAE secures CfD for MeyGen site, Energy Global, 2024