In the Belgian part of the North Sea (BNS) and in the coastal zone, military activities and exercises take place on a regular basis. Near the coast of Knokke-Heist, on the shallow sandbank of the Paardenmarkt, there is also a dump site of munitions from the First World War. The thematic chapter gives an overview of the current knowledge on policy and spatial use, as well as socio-economic data, ecological impact and measures concerning a sustainable practice for this activity in the coastal zone and the BNS. Figures and underlying data can be consulted interactively through the Coastal Portal.