[1] The semi-displacement vee hull is fabricated from aluminium alloy, and each vessel is built to a combination of Det Norske Veritas standards for high-speed light craft and RAN requirements.

[2] The Armidales can travel at a maximum speed of 25 knots (46 km/h; 29 mph), and are driven by two propeller shafts, each connected to an MTU 16V M70 diesel.

[2] Each RHIB is stored in a dedicated cradle and davit, and is capable of operating independently from the patrol boat as it carries its own communications, navigation, and safety equipment.

Larrakia operated off Dundee Beach in Darwin in concert with units from the Indonesian Navy and RAN Fleet Air Arm.

[9][10] In June 2012, Larrakia was one of several ships to respond to a Suspected Illegal Entry Vessel which sank with 206 passengers while en route to Australia.