ADV Cape Capricorn

Australian Defence Vessel (ADV) Cape Capricorn, named after Cape Capricorn in Queensland, is an evolved Cape-class patrol boat of the Royal Australian Navy (RAN).

The ship is the fourth of ten evolved Cape-class patrol boats to be delivered to the Royal Australian Navy. Prior to Cape Capricorn, the RAN already operated the Cape-class patrol boats ADV Cape Fourcroy and ADV Cape Inscription as well as the evolved Cape-class patrol boats ADV Cape Otway, ADV Cape Peron and ADV Cape Naturaliste.

The ship was built by Austal in Henderson, Western Australia, commissioned on 13 February 2023 and based at HMAS Coonawarra in Darwin, Northern Territory. Cape Capricorn was officially welcomed in Darwin in June 2023, alongside her sister ship Cape Naturaliste, becoming the first evolved Cape-class patrol boats to be based there. The patrol boat's primary duty lies in fisheries protection, immigration, customs and drug law enforcement operations.

The ship is one of the original six evolved Cape-class patrol boats the RAN ordered in April 2020 to replace the Armidale-class patrol boats in this role, at a projected cost of A$324million. This order was subsequently expanded by another two boats in April 2022, at an additional projected cost of $124million. In November 2023, the RAN ordered a further two evolved Cape-class patrols, at a cost of A$157.1million.