Sonars allowing the detection and classification of submarines and surface ships, installed on board submarines, surface ships, helicopters or aircraft; mine-hunting sonars, acoustic sonobuoys, anti-torpedo defense systems, masts for submarines and radiocommunications antennas; seismic streamers for oil prospection, trawl positioning systems, acoustic positioning systems, multi-beam echosounders for deep and shallow waters, doppler navigation systems; protection acoustic systems for aquaculture