Five ships of the Royal Navy have borne the name HMS Sentinel:
The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by the English kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years War against the Kingdom of France. The modern Royal Navy traces its origins to the early 16th century; the oldest of the UK's armed services, it is known as the Senior Service.
- HMS Centinel (1804) was a 12-gun brig, formerly named Friendship. She was purchased in 1804 and wrecked in the Baltic in 1812.
- HMS Sentinel (1904) was a Sentinel-class scout cruiser launched in 1904 and sold in 1923.
- HMS Sentinel was an S-class destroyer, renamed HMS Scorpion before being launched in 1942.
- HMS Sentinel (P256) was an S-class submarine launched in 1945 and scrapped in 1962.
- HMS Sentinel (1975) was a patrol vessel purchased in 1983. She was previously named Seaforth Warrior and Edda Sun. She was commissioned in 1984 and paid off in 1992. She was sold in 1993.
A brig is a sailing vessel with two square-rigged masts. During the Age of Sail, brigs were seen as fast and maneuverable and were used as both naval warships and merchant vessels. They were especially popular in the 18th and early 19th centuries. Brigs fell out of use with the arrival of the steam ship because they required a relatively large crew for their small size and were difficult to sail into the wind. Their rigging differs from that of a brigantine which has a gaff-rigged mainsail, while a brig has a square mainsail with an additional gaff-rigged spanker behind the mainsail.
The Baltic Sea is a marginal sea of the Atlantic Ocean, enclosed by Denmark, Estonia, Finland, Latvia, Lithuania, Sweden, northeast Germany, Poland, Russia and the North and Central European Plain.
HMS Sentinel was one of two Sentinel-class scout cruisers which served with the Royal Navy. She was built by Vickers Limited at Barrow, laid down in June 1903, launched on 19 April 1904 and completed in April 1905 at a cost of about £282,000. She was originally to be named HMS Inchkeith, but was renamed in 1903, prior to launching.
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