Trinity House, participating on behalf of three General Lighthouse Authorities (GLA) of the UK and Ireland, was founded by Royal Charter in 1504. MarRINav will be supported by the GLA Research & Development (GRAD) Directorate. GRAD has extensive capability and experience in R&D for maritime PNT and communications, representing the GLA internationally within IALA and European working groups. GRAD engages in respect of maritime E-GNSS with ESA, EUSPA and ESSP through the EMRF and within EC projects (such as SEASOLAS) and ESA projects (such as AMNAS).  Particular R&RNAV strengths include R&D of GNSS backup systems for resilient PNT, having previously established an Initial Operational Capability for eLoran in the UK. A principal focus of GRAD activity considers future aids-to-navigation infrastructure, systems and services. R&RNAV has in-depth technical expertise in resilience and integrity of marine navigation. This includes maritime services of SBAS/EGNOS and backup systems complementary to GNSS to assure safety and efficiency of navigation.