The Corsica Channel Mooring (CoCM) has a strategic location in the area of the NW Med where the Northern Current develops. It is an underwater station at about 450 m depth moored between the islands of Capraia and Corsica, at the sill of the Corsica Channel. Operative since July 1985, it continuously measures ocean currents and thermohaline properties of water masses in predetermined depths. Maintenance and data recovery are managed twice per year. Developments towards real time data transmission are planned for both installations. In occasion of the 6-month maintenance, which is done using a fully equipped research vessel, along the transect connecting the edges of the channels, additional measurements are carried out, which will be available to the users on specific request. Those are physical (CTD stations, vessel mounted ADCP, lowered ADCP profiles) and chemical (dissolved oxygen, dissolved inorganic nutrients) measurements.