This report presents the second data resource assessment performed by Work Package 2 (WP2) and was undertaken to document the current state of data relevant to EirWind’s GIS-based multi-criteria decision analysis. This assessment builds on the initial data resource assessment by reporting the updated state of data gaps and quantifying improvements to datasets relevant to OWE developments. The most significant improvements have been made to geological and visual impact datasets which are important to wind farm planning and have been improved using novel research techniques. Data coverage for bathymetric and geologic datasets, plus special areas of conservation, is assessed as a percentage (by area) of following three subsets of the Irish maritime limit: (1) the exclusive economic zone; (2) the 200-m isobath, which represents area suitable for floating wind developments; and (3) the 70-m isobath, which represents area suitable for fixed-bottom developments. These assessments reveal that high-resolution INFOMAR data is currently best suited for fixed-bottom assessments and that low-resolution European data (EMODnet) improves in coverage with distance from shore—highlighting the efforts of national research programmes like INFOMAR. These assessments also reveal that environmental restriction zones are more likely to affect fixed-bottom developments, because their largest spatial percentage falls within the 70-m isobath. Individual datasets are assessed as components within each of the five individual models (industry restrictions; environmental restrictions; cultural heritage restrictions; exclusion zones; and technical opportunities) that comprise the multi-criteria decision analysis being developed by WP2. This assessment considers data availability and reveals that the largest EirWind contributions to the Multi-Criteria Decision Analysis (MCDA) data have been made to the technical opportunities model (Figure ES1). An initial assessment of potential sea-use synergies is presented because not all the different activities or uses within the Irish marine limit will be incompatible. Some sea-uses may intersect spatially without necessarily negatively affecting each other and these relationships should be considered when developing and/or interpreting a MCDA of offshore wind potential. This assessment considers 11 variables that represent disparate sea uses and, although it is preliminary, it is the first of its kind for Ireland. This report also presents a discussion on the potential impacts of spatial data and WP2’s ongoing work plan. This discussion addresses how EirWind’s spatial data management efforts and GIS analyses are compatible with Irish marine policy. We posit that insights from GIS analyses will be critical to responsible governance and that the MCDA we are finalising will be a useful tool for both offshore wind farm planning and informing policy makers. Finally, we outline the future work for WP2, which includes weighting the parameters within the MCDA and interpreting its results.