Indigenous sonar simulator Dhwani was inaugurated by Director Naval Physical and Oceanographic Laboratory S Anantha Narayana at the Indian Navy Submarine training school INS Satvahana in Visakhapatnam on Friday. The state-of-the-art simulator – Dhwani – is a completely indigenous system developed for training the submariners on operational aspects of Sonar. It was executed by NPOL KochiThe inaugural function was attended by several senior submariners of ENC including Flag Officer Submarines Rear Admiral SV Bhokare and Commanding Officer INS Satavahana Commodore A Srinivas.