The new plan turns one pilot into a wider question
The Maritime and Coastguard Agency published its 2026–27 Business Plan on 16 October 2026. One of its stated objectives is to reduce obstacles to innovation by embedding the UK Maritime Innovation Hub and taking steps to facilitate autonomy trials.
The plan connects that objective to practical work in Plymouth: complete a six-month trial arrangement, assess and oversee maritime autonomous surface ship testing in the Dockyard Port of Plymouth, and develop guidance setting out the legal and safety requirements for the concept to be replicated elsewhere in UK waters. The published milestone is due by 31 December 2026.
That is an important direction of travel, but it is not a national permission to begin trials anywhere. As at 20 October, the commitment is to complete the pilot work and develop guidance. Any future trial will still need an appropriate regulatory route, permission for the intended waters and evidence proportionate to its risks.
What the Plymouth pilot actually provides
The MCA and King’s Harbour Master Plymouth have established designated trial areas inside the Dockyard Port of Plymouth. The six-month pilot is intended for eligible prototype vessels using innovative technology, including maritime autonomous surface ships, before commercial certification is requested.
Trials take place under the MCA’s Proving at Sea – Innovative Prototype Vessel Trials framework. The published route combines operation within the designated areas, compliance with applicable regulations and a risk-based certification approach supported by a trials safety case. A designated MCA Innovation Surveyor oversees each project.
Certification under this framework is time-limited. It may be issued for up to three months initially and extended to a maximum of six months where further testing is required. The MCA is explicit that this certification supports testing only.
It is a defined route, not a route for every vessel
The published eligibility criteria matter. A prototype must be a UK ship, be less than 24 metres in length overall, use prototype innovative technology and carry no more than 12 people. The route excludes vessels operating in ground effect, on an air cushion or beneath the surface, as well as vessels using specified fuels or carrying dangerous goods.
Operators should therefore check the scope before treating Plymouth as their test route. A vessel outside those limits may need a different certification and approval pathway. The UK Maritime Innovation Hub guidance also makes clear that the applicable route depends on vessel size, operating area and intended use.
The pilot does not replace normal harbour controls or applicable legislation. It creates a structured place in which an eligible prototype can be assessed and tested within an agreed scope.
Prepare the evidence before booking the water
The prototype-trials guidance says applicants must engage with the UK Maritime Innovation Hub before applying. The application must set out the trial objectives and concept of operations, vessel and system details, a regulatory gap analysis, and a trials safety case showing how risks are reduced as low as reasonably practicable.
The Hub’s autonomy guidance describes early access to MCA specialists and support with trial design, evidence planning, safety cases, operational and human-machine-interface considerations, and regulatory readiness. This makes early engagement useful while the design and operating concept can still change—not after the vessel, trial plan and contractual arrangements have become fixed.
MGN 664 Amendment 1 provides the broader certification context for innovative technology. It describes a proportionate, iterative process built around an agreed approval basis and supporting evidence. A risk-based approach is not a lighter substitute for evidence; it is a way to identify the evidence and controls the particular innovation requires.
Replication will depend on local interfaces
The MCA’s plan to develop guidance for possible replication elsewhere in UK waters could make the route clearer for projects beyond Plymouth. Replication should not be confused with copying one harbour arrangement word for word.
Each operating area has its own traffic picture, geography, local directions, communications and emergency interfaces. A repeatable model therefore needs a common core while leaving room for the relevant harbour or navigation authority, the MCA and the operator to address local conditions.
In practical terms, an operating concept should identify the trial boundaries, operating limits, responsible people, remote-control arrangements, communications, stop criteria, incident escalation and the route to a safe state. The forthcoming guidance may add detail; until it is published, operators should not assume what its final requirements will be.
Where local marine support may fit
None of the cited MCA guidance says that every prototype trial must have a dedicated support vessel. The need for launch assistance, escort, line-of-sight observation, intervention, towage or recovery should follow the vessel, trial activity, operating area and safety case.
ARC’s operational view is that any physical-response provision should be designed into the trial rather than left as a telephone search after a failure. If the safety case identifies a credible situation in which shore control cannot place the vessel in a safe state, the team should decide what intervention is needed, what type of craft and crew can provide it, who can activate it and how quickly it must arrive.
A nearby AIS marker is not evidence of readiness. Compatibility of tow points and handling arrangements, deck layout, crew competence, communications, weather limits, harbour requirements and realistic sea-route mobilisation time all need to match the task.
A practical trial-readiness pack
The formal submission must follow current MCA and harbour requirements. Before that submission, a concise working pack can help the project team expose gaps and prepare a more coherent discussion with the Innovation Hub.
The detail should remain proportionate to the prototype and proposed activity. Its purpose is to connect the technical test with the people, place, decisions and physical response needed to conduct it safely.
- State the trial objectives, test sequence and concept of operations.
- Describe the vessel, autonomy or remote-control systems and intended operating limits.
- Map applicable requirements and identify genuine regulatory gaps.
- Maintain a hazard log, trials safety case and clear change-control process.
- Define safe states, stop criteria, decision authority and loss-of-control responses.
- Agree communications with the harbour, trial team, remote operators and any support craft.
- Specify task-based launch, escort, intervention, towage or recovery arrangements where the risk assessment calls for them.
- Record what evidence each run must produce and how learning will be reviewed before the next change.
ARC’s practical view
The most useful outcome from Plymouth would not be a generic permission for autonomy trials. It would be a clear, repeatable way to bring a novel vessel, a defined operating concept, local water-space control and proportionate evidence together.
That can help technology developers plan earlier and help ports understand what a well-prepared request should contain. It can also give local commercial vessel operators a clearer role where a safety case identifies a real need for physical assistance.
ARC is building the coordination layer for that last interface: define the marine-support task, identify suitable local capability and keep the operational and commercial record connected. The trial operator, regulator, harbour authority and vessel master retain their own responsibilities; the value is in making sure the interfaces have been prepared before the vessel goes to sea.