A seat cushion includes a cushioned bottom portion and a back portion. The sonobuoy receives acoustic information from hydrophones and transmits this information to the aircraft, via beams having a predetermined frequency spectrum. A secondary-side second sheet-metal shaped part is mounted rotatably about the axis of rotation in relation to the primary-side first sheet-metal shaped part. For outgoing data packets received from the endpoint, the relay reprocesses the outgoing packets based upon the error correction scheme, such as to remove redundant packets before transmitting them to the network over the wire.