For a long time, while not forgetting the few well-established centres of medical advice by radio, medical assistance at sea has been synonymous with evacuation. Sometimes, however, evacuation is not possible. More often, it is dangerous both for the rescue team (due to the difficulty of the weather or technical conditions), or for the person being assisted (due to his condition). It often presents secondary, but not negligible, problems, linked to the psychological isolation of the patient and the difficulty of repatriating him to his country of origin