MarGIS intends the combination of Geographical Information Systems (GIS), research data, and multivariate geostatistical techniques for characterisation and identification of distinct provinces at the seafloor of the North Sea. Such a typological approach, the analysis of classification based on types, is one prerequisite for management issues related to coastalseafloor. It provides a framework for improved application of large environmental data sets, allows enhanced visualisation of multiple information layers, and supports modeling of temporal and spatial interrelations of coastal and ocean regions. To tackle the problem of presentation of large data sets MarGIS uses a web-based viewer which allows a clear visualisation of the information for the general public. The viewer allows a dynamic actualisation and access to metadata and additional information.