HMAS Watson is a Royal Australian Navy (RAN) base on Sydney Harbour at South Head, near Watsons Bay in Sydney, Australia. Commissioned in 1945, the base served as the RAN's radar training school. In 1956, torpedo and anti-submarine warfare training were relocated to the base, and by 2011, Watson was the main maritime warfare training base, as well as providing post-entry education for maritime warfare officers, training for combat system and electronic warfare sailors, and command training.

Port Jackson, consisting of the waters of Sydney Harbour, Middle Harbour, North Harbour and the Lane Cove and Parramatta Rivers, is the ria or natural harbour of Sydney, New South Wales, Australia. The harbour is an inlet of the Tasman Sea. It is the location of the Sydney Opera House and Sydney Harbour Bridge. The location of the first European settlement and colony on the Australian mainland, Port Jackson has continued to play a key role in the history and development of Sydney.