18As regards the technical characteristics of such navigation, the Court stated, at paragraph 40 of Jan De Nul, that manoeuvres carried out by a hopper dredger during its pumping and discharge of materials, that is to say, movements inherent in the carrying out of dredging activities, come within the scope of the term ‘navigation’ as used in the first subparagraph of Article 8(1)(c) of Directive 92/81. Thus, that term requires that the provision of services for consideration be inherent in the vessel’s movement.