The massive central processing platform, one of the largest in the world, has set off on its long journey to the Western Australia.
It set sail from the shipyard at Geoje, South Korea, last week following the completion of shipyard commissioning and preparation work.
The voyage to the Ichthys field will take around six weeks, after which time the giant facility will be progressively hooked up to the almost 900km-long pipeline to the LNG plant near Darwin and the production wells.
It will later be joined by the floating production, storage and offloading facility, Ichthys Venturer.
Inpex said last week that the full project would begin before the end of the Japanese financial year, which ends March 31.
Condensate will be produced initially, followed by LNG and LPG.
The facility will then separate and process the hydrocarbons lifted from subsea production wells into gases and liquids over a planned 40 years of continuous operation.