<p>Abstract: Twelve harbour seals (Phoca vitulina) were captured in the Baie des Veys (Normandy, France) between October 2007 and October 2008 and fitted with Fastloc GPS/GSM tags (Sea Mammal Research Unit - SMRU, UK). The project was funded by the DIREN Basse Normandie. The study was conducted by Cecile Vincent at the University of La Rochelle (France) in collaboration with SMRU, the Reserve Naturelle Nationale du Domaine de Beauguillot, PELAGIS (CNRS/La Rochelle University), and the Office national de la chasse de la faune sauvage (ONCFS). Seals were caught under licenses delivered by the French ministry of the environment. </p>