Abstract: A protective cover for a craft and collection and fastening unit thereof to a quay or a jetty that comprises a flexible, opaque, laminar body that is symmetrical about its vertical axis and trunk-conical, having a front side and a rear side that is parallel to and narrower than the front side, and lateral sides formed by a longer inclined portion and a shorter straight portion. The protective cover serves to isolate the parts of interest from a surrounding body of water and to prevent the passage of sunlight. The front side of the cover includes a ballasted area and the rear side thereof a rigidified area. A unit formed by cords fastened to the jetty makes it possible to collect the cover and fasten it thereto.