The Lehanagh Met-Ocean buoy is part of the Sentinel sites and is located in Bertraghboy bay, Connemara, County Galway. Initially installed in May 2024, sensors have been deployed for the measurement of temperature, salinity, dissolved oxygen, pH, turbidity, total dissolved solids, chlorophyll a, phycoerythrin and depth. In addition, a weather station was installed for measuring wind speed and direction, air temperature, humidity and atmospheric pressure at this site. Also a wave buoy records wave height, wave direction and wave period and an ADCP records current speed and direction. This work has been funded through the EMFAF Sentinels Site project. Data telemetry: Measurements have been made every 10 minutes and transmitted every 2 hours to the Marine Institute. Disclaimer: These data are real-time (GMT) and raw - they have not yet been through the full quality checking procedures. There may be short term data gaps caused by maintenance, re-deployments, or technical difficulties. The buoy is situated close to a Marine Institute fish farming site, providing useful data for their research as well as providing a counterpoint to similar measurements made at the Mace Head data buoy