Six ships that were built for the Royal Navy have borne the name HMS Ocean. The name Ocean entered the list from which names are selected for British ships in 1759, when the Royal Navy captured the French ship named Océan. The British studied the French technology of this ship and admired it, but the ship had to be in bad shape before it would be replaced by a new-build.
A monitor is a relatively small warship that is neither fast nor strongly armored but carries disproportionately large guns. They were used by some navies from the 1860s, during the First World War and with limited use in the Second World War.
Five ships and a shore establishment of the Royal Navy have been named HMS Mersey after the River Mersey:
HMSM33 is an M29-class monitor of the Royal Navy. Built in 1915, she saw active service in the Mediterranean during the First World War and in Russia during the Allied Intervention in 1919. She was used subsequently as a mine-laying training ship, fuelling hulk, boom defence workshop and floating office, being renamed HMS Minerva and Hulk C23 during her long life. She passed to Hampshire County Council in the 1980s and was then handed over to the National Museum of the Royal Navy in 2014. A programme of conservation was undertaken to enable her to be opened to the public. HMS M33 is located within Portsmouth Historic Dockyard and opened to visitors on 7 August 2015 following a service of dedication. She is one of only three surviving Royal Navy warships of the First World War and the only surviving Allied ship from the Gallipoli Campaign, the other being the Ottoman minelayer Nusret, preserved in Çanakkale.
HMS Mersey was a Humber-class monitor of the Royal Navy. Originally built by Vickers for the Brazilian Navy and christened Madeira, she was purchased by the Royal Navy in 1914 on the outbreak of the First World War along with her sister ships Humber and Severn.
Nine ships of the Royal Navy have been named HMS Severn after the River Severn:
Coastal defence ships were warships built for the purpose of coastal defence, mostly during the period from 1860 to 1920. They were small, often cruiser-sized warships that sacrificed speed and range for armour and armament. They were usually attractive to nations that either could not afford full-sized battleships or could be satisfied by specially designed shallow-draft vessels capable of littoral operations close to their own shores. The Nordic countries and Thailand found them particularly appropriate for their island-dotted coastal waters. Some vessels had limited blue-water capabilities; others operated in rivers.
The Humber-class monitors were three large gunboats under construction for the Brazilian Navy in Britain in 1913. Designed for service on the Amazon River, the ships were of shallow draft and heavy armament and were ideally suited to inshore, riverine and coastal work but unsuitable for service at sea, where their weight and light draft reduced their speed from a projected twelve knots to under four. The class comprised Humber, Mersey and Severn. All three were taken over by the Royal Navy shortly before the outbreak of the First World War and were commissioned as small monitors. All three saw extensive service during the war and were sold in 1919.
Nine ships of the Royal Navy have borne the name HMS Speedy:
HMS Severn was a Humber-class monitor of the Royal Navy. Originally built by Vickers for Brazil, she was purchased by the Royal Navy in 1914 on the outbreak of the First World War along with her sister ships Humber and Mersey. She had been christened Solimoes by the Brazilians, but was renamed by the British. The three ships were the first of a new type of specialized shore-bombardment warships. As a result of her shallow draught, she was very un-manoeuvrable and unseaworthy in open waters in anything more than a Force 5 wind.
HMS Havant was an H-class destroyer originally ordered by the Brazilian Navy with the name Javary in the late 1930s, but was bought by the Royal Navy after the beginning of World War II in September 1939. The ship was initially assigned to escort duties in the Western Approaches, but was transferred to the Home Fleet when the Norwegian Campaign began in April 1940. She was only peripherally involved in the campaign as she escorted ships carrying troops that occupied Iceland and the Faeroe Islands as well as convoys to Narvik. Havant was evacuating troops from Dunkirk when she was badly damaged by Junkers Ju 87 Stuka dive bombers on 1 June and had to be scuttled.
HMS Humber was a Humber-class monitor of the Royal Navy. Originally built by Vickers for Brazil as Javary, she was purchased by the Royal Navy in 1914 on the outbreak of the First World War along with her sister ships Severn and Mersey.
Eight ships of the Royal Navy have borne the name HMS Humber, after the Humber, an estuary in eastern England, whilst another was planned:
Brazilian monitor Solimões may refer to one of several monitors of the Brazilian Navy:
By taking on ships being built for foreign navies in British shipyards, a number of British-built 6-inch 50-calibre naval guns found their way into British service in World War I. Their specifications and performance differed from standard Royal Navy 6-inch guns but in British service they fired standard service 100-pound projectiles.
Two ships of the Royal Navy have been named HMS Havant, after the town of Havant in Hampshire:
Javary was a Javary-class armored monitor operated by the Imperial Brazilian Navy and Brazilian Navy. Her sister ship was the Solimões. She is known for her armor and powerful armaments for the time. Her service was limited by the inadequate draught for certain stretches of river, and her maneuverability was reduced due to an extremely low side, which meant the ship was used mainly as a floating battery. She was sunk after being shot at by the Fortaleza de São João during the Revolta da Armada in 1893.
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