This exchange of 15 days, including 12 in the open sea , with 3 habitable sailing boat will gather 24 teenagers aged 13 to 17 from 3 nations (France , Portugal, and Italy). These young with different culture and with very different knowledge about the marine environment and navigation competences will be supervised by a team of 3 professional skippers and 4 leaders for a total of 30 participants. It aims to : - Discover the high seas on different boats. We can discover the changes between the old ships and charter yachts large current comfort. - Discover or deepen participants' knowledge of the marine environment by practicing sail , marine cartography , steering , handling electronic equipment and the initiation of maritime code. - Discover the rich beauty of the islands , their history and their culture - Live a rich life experience collective conducive to the development of each individual and their accountability in a group, in a confined space such as sailboats. - Interact and communicate in different languages with youth and adults who made this exchange. - to make their points of view evolve on the image they have of the various cultures represented during this exchange by setting up workshops on stereotypes and prejudices. So we can discuss with them the different themes and learning every moment workshops , outings, navigation. This , based on the presentations : the situation in their country, videos, scheduled visits . But also by the contribution of supervisors of this meeting and professional skippers that frame navigation. We therefore consider that the youth have a real learning knowledge level of the marine environment , navigation , ecology marine environment. But also at the organizational and community life with a strong influence inter cultural causing them to have a significant personal reflection on their position