The selection of appropriate offshore renewable energy system sites is essential for their economic viability, given the uncertainties surrounding their potential. While current site selection approaches primarily focus on energy potential, the impact of operation and maintenance (O&M) factors on the site's location is also critical. Traditional accessibility assessment metrics are limited for detailed accessibility evaluations, requiring the development of a novel, technology-informed metric that considers crucial factors such as metocean conditions, visibility, system failures, and O&M logistics. For this study, data on wave heights, wind speed and fog were collected from the European Centre for Medium-Range Weather Forecasts (ECMWF) database for the years 1959 to 2021, and matched with failure rates, vessel types, required repair times and sunrise/sunset times according to predefined criteria.