ProtectedShips Navantia Australia awarded DDG Platform Systems Design contract By ANI - August 21, 2023 0 333 HMAS Hobart in the Captain Cook Graving Dock, Garden Island, in 2019. Navantia Australia has been engaged by the Commonwealth of Australia as the Platform Systems Designer for the SEA4000 Phase 6 Hobart Class Guided Missile Destroyer Combat Systems upgrade. Please Login to view this content. (Not a member? Join Today!)