The Cohort Group comprises six military, electronics and intelligence development operations spread across the UK, Germany, and Portugal. The six are:  Chess offering electro-optical tracking and surveillance systems for naval and land defence and security customers; EID designs and makes advanced communications systems for naval and land defence customers; ELAC SONAR supplies advanced sonar systems and underwater communications to global customers in the naval marketplace; MASS provides advanced digital services serving the defence and security markets MCL designs, sources and supports advanced electronic and surveillance technology for the UK MOD and other government agencies; SEA delivers and supports technology-based products for the defence and transport markets alongside specialist research and training services.