The General Lighthouse Authorities of the United Kingdom and Ireland (GLAs) comprise:

  • Trinity House
  • Northern Lighthouse Board
  • Commissioners of Irish Lights

The Research and Radionavigation Directorate (R&RNAV) undertakes research and development of physical and radio marine aids to navigation, support systems and their integration to support the GLAs' mission "to deliver a reliable, efficient and cost-effective Aids to Navigation service for the benefit and safety of all mariners".