Data source: EPSG
Information source: United Kingdom Hydrographic Office (UKHO).
Revision date: 2022-11-29
Scope: Hydrography and nautical charting.
Remarks: By international agreement, Chart Datum is defined as a level so low that the tide will not frequently fall below it. In the United Kingdom and Ireland, this level is normally the level of approximate Lowest Astronomical Tide.
Area of use: Ireland and United Kingdom (UK) (including Isle of Man and Channel Islands) - inshore, nearshore and offshore.
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "VerticalReferenceFrame", "name": "Chart Datum UK & Ireland VORF08", "scope": "Hydrography and nautical charting.", "area": "Ireland and United Kingdom (UK) (including Isle of Man and Channel Islands) - inshore, nearshore and offshore.", "bbox": { "south_latitude": 47.42, "west_longitude": -16.1, "north_latitude": 63.89, "east_longitude": 3.4 }, "id": { "authority": "EPSG", "code": 1331 } }