VERTCRS["St. Marys height",VDATUM["St. Marys"],CS[vertical,1],AXIS["gravity-related height (H)",up,LENGTHUNIT["metre",1]],USAGE[SCOPE["Geodesy, engineering survey."],AREA["United Kingdom (UK) - Great Britain - England - Isles of Scilly onshore."],BBOX[49.86,-6.41,49.99,-6.23]],ID["EPSG",5749]]