The map was produced by the Federal Maritime and Hydrographic Agency (BSH) and depicts the sediment conditions within the German Exclusive Economic zone and coastal areas in a scale of 1:250.000 (Laurer et al. 2014). Grain size fractions were classified according to the sediment calssification system of Figge (1981) and grouped to polygons data layers covering the entire area of interest (for detailed information please refer to Laurer et al. 2014). Corresponding sediment formed the basis to differentiate Level 3 substratetypes according tothe new German Red List Biotope classification system (Finck et al. 2017): sandy habitats, muddy habitats, coarse sediment habitats, mixed and hard bottom habitats