EDA, NATO Enable Real-World Testing of Unmanned Systems

The European Defence Agency (EDA), NATO and the Portuguese Navy co-organised the 15th Robotic Experimentation and Prototyping using Maritime Unmanned Systems (REPMUS), the world’s largest event for testing unmanned maritime systems, held off the coast of Portugal. 

Running from 1 to 26 September in the waters south of Lisbon, the Portuguese-led exercise brought together 24 nations and tested some 300 uncrewed platforms across sea, air, and land domains.

It also marked the first time NATO’s military exercise ‘Dynamic Messenger’ was linked with REPMUS, combining operational training with experimental testing.

REPMUS/Dynamic Messenger 25 gave both militaries and industry the chance to trial robotics and artificial intelligence in real-world scenarios, including electronic jamming and dummy underwater mines.

“This was an opportunity to experiment on unmanned vehicles across all domains and in a real environment,” said Captain Nuno Palmeiro Ribeiro, Director of the Portuguese Navy Operational Experimentation Centre (CEOM). “What’s special about this zone is that we can do experimentation that is not possible elsewhere.”

Swarms, standards
Scenarios included Intelligence, Surveillance and Reconnaissance (ISR) in coastal zones, electronic warfare in GPS-denied environments, and amphibious landings supported by robotic scouts and logistics drones. One highlight saw multiple uncrewed aerial vehicles performing ‘swarm’ operations, demonstrating the ability to operate autonomously in coordinated missions.

EDA, the EU agency tasked with strengthening defence cooperation among Member States, hosted seminars to highlight the importance of interoperability and ensuring allied and partner nations’ systems can work together. “Unmanned underwater vessels have different batteries, different chargers. We need to develop standards to improve interoperability and even interchangeability,” said Juergen Scraback, Head of EDA’s Maritime Domain Unit.

EDA is also establishing best practices. To address the lack of common regulations and safety procedures, the Agency is leading the Safety and Regulations for European Unmanned Maritime Systems (SARUMS) which provides a safety framework and guidance for design, operations, and legal compliance.

EDA has also supported a project to develop a swarm of biomimetic underwater vehicles for intelligence, surveillance, and reconnaissance (SABUVIS). EDA’s leadership in such projects emphasises its aim to accelerate Europe’s use of tested, mission-ready autonomous technologies in NATO and EU operations. 

Several start-ups supported by NATO’s Defence Innovation Accelerator for the North Atlantic (DIANA) used the event to test technologies for communications resilience, protecting undersea infrastructure and improving mine countermeasures. The Faculty of Engineering at the University of Porto and NATO’s Centre for Maritime Research and Experimentation were also contributors.

Undersea warfare
The addition this year of Dynamic Messenger, led by NATO’s Allied Command Transformation and Allied Maritime Command (MARCOM), added a more operational dimension. While REPMUS focused on experimentation and integration, Dynamic Messenger provided a live operational framework, showing how new technologies can be deployed with NATO fleets.

More than 2,000 participants from 22 NATO nations took part, alongside observers from 13 other countries including Australia, Brazil, and South Korea. Ships from Standing NATO Maritime Group 1 also joined, highlighting the alliance’s focus on maritime readiness.

Unmanned systems are not intended to replace crewed forces, but to support them, taking on tasks such as high-risk reconnaissance or supply runs in contested environments.

With EDA now firmly embedded as a co-organiser in REPMUS, officials expect the annual event to continue serving not only as NATO’s largest unmanned systems exercise, but also as a platform for closer EU-NATO cooperation in defence technology.