Buoy S1 was visited 2011-04-11 for sensor change and installation (T,H and compass). Buoy E1 was visited 2011-01-12. A number of 3 CTD casts within minutes from measurement time of Buoy data logging were performed close to S1 and E1. Furthemore, some multibeam runs were obtained for accurate mapping (see Fig. 22, while table 6 reports the coordinates).