HMS Vigilant was a 64-gun third-rate ship of the line of the Royal Navy, launched on 6 October 1774 at Bucklers Hard.^[1]

Vigilant
History
Great Britain
Name	HMS Vigilant
Ordered	14 January 1771
Builder	Adams, Bucklers Hard
Laid down	February 1771
Launched	6 October 1774
Fate	Broken up, 1816
General characteristics [1]
Class and type	Intrepid-class ship of the line
Tons burthen	1347 bm
Length	159 ft 6 in (48.62 m) (gundeck)
Beam	44 ft 4 in (13.51 m)
Depth of hold	19 ft (5.8 m)
Propulsion	Sails
Sail plan	Full-rigged ship
Armament	64 guns: Gundeck: 26 × 24 pdrs Upper gundeck: 26 × 18 pdrs Quarterdeck: 10 × 4 pdrs Forecastle: 2 × 9 pdrs

By 1779 she had been deemed unseaworthy by the navy. She was stripped of her sails and used as a floating battery to support the amphibious landing of British Army troops on Port Royal Island, South Carolina prior to the Battle of Beaufort.^[2] From 1799 she served as a prison ship, and was broken up in 1816.^[1]