When Marine Themes Vector and Digital Elevation Model are provided as datasets they are provided in geographic coordinates
WGS84 (EPSG:4326). Raster Charts are provided in their original coordinate reference system, usually to the
WGS84 Datum (EPSG:4326) and in Mercator or Transverse Mercator, the latter with an individually defined meridian. Raster Charts XL Web Map Tile Service (WMTS) are provided in
WGS 84 / Pseudo-Mercator (EPSG:3857) and Raster Charts XL Geotiffs available as World Mercator. Note that, all popular GIS software packages are able to read these directly without the need for any external transformations to be carried out. All depths are to Chart Datum, which in most cases is equal to Low Astronomical Tide (LAT) or Lowest Low Water (LLW) depending on location. On request, we can transform all our datasets to national and other Coordinate Reference Systems of your choice. For our Marine Themes Digital Elevation Model, the data is transformed to Mean Sea level or where appropriate, to a terrestrial datum. Additional charges apply for all projection and/or datum transformations, so please
contact us for details.