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

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

The Research and Development Directorate (GRAD) 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".