This dataset contains full-year RINEX 2.11 GNSS observation files (GPS and GLONASS) for the year 2024 from the LEFK station, located in Lefkada, Greece. The data are provided in the context of the HOMEROS research project, part of the OSCARS initiative, which aims to harmonise observations in multi-hazard environments and promote open science. The OSCARS project has received funding from the European Commission’s Horizon Europe Research and Innovation programme under grant agreement No. 101129751.