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".