Mulloka was an Australian-designed sonar system installed on ships of the Royal Australian Navy. It was optimised for the warm and shallow waters common off Australia and used a high frequency. The system was developed during the 1970s, with River class destroyer escort HMAS Yarra being used as the trial ship for Mulloka between 1974 and 1979. These trials ended on 17 August 1979 when the system was accepted for service. Mulloka was subsequently fitted to all the RAN's River class destroyer escorts and two of the six Adelaide class frigates. It was removed from the frigates during the 2000s as part of an upgrade of their capabilities.
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- "HMAS Yarra (III)". Royal Australian Navy. Retrieved 2009-07-11.
- "On this day: 1976-1999 > Post Vietnam". Naval Historical Society of Australia. Retrieved 2009-07-11.
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