J+S Ltd, specializes in in-service support, technology development and insertion and obsolescence management in the defence, oil and gas and marine renewable energy sectors. It has specialized capabilities in sub-sea systems acoustic, weapon launch systems and electro-mechanical systems. Its 130 employees are located in Barnstaple and Aberdeen.

As a premier technology-based solutions provider, J+S hold a comprehensive range of corporate quality certifications including:

• ISO 9001:2008 and BS/EN AS9100,
• ISO 14001:2004 (environment),
• OHSAS 18001:2007 (health and safety), and
• TickIT certification for software development.

J+S participates in Supply Chain 21 (SC21) a change programme to raise the competitiveness of the UK's defence and aerospace industry. In 2010 J+S won a KPMG/RBD business award for innovation and has also been recognized for its contribution to climate change management.

With 50-years of experience, J+S have a long history of supporting the United Kingdom Royal Navy. It owns intellectual property and is the UK design authority for naval systems used on British-designed ships and submarines. J+S's defence customer base includes the UK MoD and overseas defence forces that operate equipment of UK origin, such as Canada, Chile and Brazil. Its customers also include leading European and U.S. prime contractors including BAE Systems, Thales, Babcock, Lockheed Martin, Ultra Electronics, MBDA and Raytheon.

J+S has three primary and interrelated areas of activity:

• In-service support including obsolescence management and resolution
• Sonar systems and weapon launch systems, and
• Engineering design and development.

It applies its competencies in systems, mechanical, software, electronics and manufacturing engineering to deliver customized services in these areas.

In-service support ranges from classic discrete support and repair contracts to availability-based Contractor Logistics Support (CLS) services that include spare parts and repair services, post-design engineering services, mobile in-service support teams and technical investigations.

J+S has particular expertise in obsolescence management, which is a critical capability as defence systems remain in service for extended periods and OEM support is withdrawn, especially in the fast-changing electronics world. J+S takes a proactive approach by conducting studies, pro-actively monitoring future change needs and conducting cost-benefit analyses of candidate solutions. However, its key capability is its in-house engineering capabilities to develop cost-effective and durable solutions.

J+S has design and development expertise in sensing, communications, electro-mechanical test and simulation/stimulation. Applications include transducers and hydrophones, including sonar arrays, electronic and electrical hardware and electronic protocols, data exchange formats and military standards. J+S designed the first Local Area Network (LAN) for Royal Navy vessels and continues to support it. The company has designed and developed low profile thin-line towed line array transducers suitable for use by Unmanned Underwater Vehicles (UUV).