A prototype is an early sample, model, or release of a product built to test a concept or process or to act as a thing to be replicated or learned from.
Retrofitting refers to the addition of new technology or features to older systems.
The Royal Australian Navy (RAN) is the naval branch of the Australian Defence Force.
The Royal Navy (RN) is the United Kingdom's naval warfare force.
A shakedown is a period of testing or a trial journey undergone by a ship, aircraft or other craft and its crew before being declared operational.
A ship is a large watercraft that travels the world's oceans and other sufficiently deep waterways, carrying passengers or goods, or in support of specialized missions, such as defense, research and fishing.
A ship class is a group of ships of a similar design.