The report includes the economic valuation of activities at sea (sea shipping, oil and gas production, fishing, sand extraction and off-shore wind energy production) and activities in seaports and in the coastal area of the North Sea. These elements constitute updates on previous versions of the report (last version published in 2014). This study expands on the previous reports in two ways: Firstly an attempt to compare the relative importance of marine economy between countries using data from Eurostat. Secondly, this report considers the possibility to study much more specific sectors which are of particular relevance to the marine economy, as determined by OSPAR (Oslo-Paris Convention for the Protection of the Marine Environment of the North-East Atlantic). This study has been financed by the Dutch Ministry for Infrastructure and the Environment in the context of the Marine Strategy Framework Directive, which requires social and economic analysis of the use of the marine environment.