Source: EPSG:9425 — ETRS89 + ODN (Offshore) height
compound horizontal + vertical reference system · Area of use: UK - offshore 49°45'N to 61°N, 9°W to 2°E
+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +geoidgrids=uk_os_OSGM15_GB.tif +geoid_crs=WGS84 +vunits=m +no_defs +type=crsMore about EPSG:9425 →