This collection of the forty-five papers presented at the International conference in Paris presents the latest developments in the field of nautical construction with composites for pleasure boat, fishing, passenger transport and naval applications. Each session is introduced by an overview paper authored by an internationally known expert. The five subject areas are the following. Design of structures. Optimisation of structures to benefit from the multidirectional properties of reinforcements, and new material developments in fibres and sandwich cores. Calculation. Improvements in the prediction of the behaviour of composite structures by numerical methods. Experimental characterization. Descriptions of correlations between experimental and numerical methods under quasi-static and dynamic loading, together with new test methods. Degradation and Control. Non-destructive testing methods, interaction with sea-water, fire resistance. In-service behaviour. Experience with composites in pleasure boat and naval applications, from fabrication to everyday use. This collection, assembled in close collaboration with the international scientific and industrial community, is a work of reference for those interested in nautical construction and improved use of composite materials in high performance applications : naval architects, material suppliers, engineers, technicians... in boatyards, shipyards, classification societies and research centres.