HMS Ranger was built at Shoreham-by-Sea by Watercraft Ltd. in 1987 and was originally allocated to Ulster Division of the Royal Naval Reserve based in Belfast on HMS Caroline and used for Junior Officer training. In 1991 she went to Gibraltar with HMS Trumpeter to form the Gibraltar Squadron, and returned to the UK to become Sussex URNU's allocated P2000 in early 2004. Her badge is a ship's wheel superimposed on 7 blue roundels, representing the seven seas.
Being a cadet training ship, Ranger is not equipped with live weaponry unless required for a supervised training exercise. It is fitted for - but not with - a 20 mm 85 GAM Cannon, as well as storage for four standard service rifles and two GPMGs.