99 Fun Facts About Nautical

In modern naval terms, what qualifies a vessel as a boat?

It can be carried aboard a ship: that is the navy's test for a boat. Submarines are the exception, still called boats by tradition however large they have grown.

The world's oldest known boat, the Pesse canoe found by Dutch road builders, was made from what?

A hollowed pine log: crews clearing peat for a motorway in 1955 took it for an old tree trunk, and it proved to be a dugout roughly 10,000 years old.

Which colour of navigation light does a ship show on its starboard side at night?

Green marks starboard and red marks port, so at night another crew can tell which way a ship is pointing, and seeing both at once means it is coming head-on.

Why was the steering oar of early ships mounted on the starboard side?

Most people are right-handed, so early steersmen worked the oar over the right-hand side, and ships tied up on their other side to keep it clear of the quay.

Before 'port', the left side of a ship was known by what name?

Larboard, possibly from a Middle English word for the loading side, was too easily mistaken for starboard, so the Admiralty ordered 'port' used instead.

The nautical mile was originally defined as one minute of what?

Latitude: one minute of it is a nautical mile, now fixed at exactly 1,852 metres, so navigators can measure distance straight off the latitude scale at the edge of a chart.

A knot is a unit of what?

Speed: one knot is one nautical mile per hour. Aircraft use knots as well, because pilots also navigate in nautical miles.

The nautical unit called the knot is named for knots that sailors tied in what?

A trailing line: sailors let it run out behind a floating wooden 'log' and counted the knots slipping past while a sand-glass emptied, which is why a ship's diary is still called a log.

Which Royal Navy officer devised the wind-force scale that still bears his name?

Francis Beaufort needed no instruments: he defined each force of wind by what it did to the sails of a Royal Navy frigate.

Which part of a ship is the long structural beam running along its very bottom?

The keel gave its name to keelhauling, an old punishment in which a sailor was dragged on a rope underneath the ship from one side to the other.

What is the lowest compartment of a ship, where water collects, called?

The bilge gathers water so foul with oil and waste that 'bilge' became slang for nonsense.

The 'poop deck' takes its name from a French word meaning what?

Stern: 'la poupe' is French for the back of a ship. The crew's toilets were at the opposite end, in the bow or 'head', which is why sailors still call a toilet the head.

On a ship, what did eight bells traditionally mark?

The end of a watch: a ship's bell counts half-hours rather than hours, adding one stroke every thirty minutes, so eight bells can mean four, eight or twelve o'clock.

Where on a ship is the crow's nest?

Upper part of the main mast: the height lets a lookout see ships and land that are still hidden beyond the horizon for everyone down on deck.

What does the Plimsoll line painted on a ship's hull indicate?

Its maximum legal loading depth: MP Samuel Plimsoll forced the mark into law in 1876, and plimsoll shoes are said to be named after it because their rubber band recalled the line on a hull.

A ship in harbour hoists the blue-and-white Blue Peter flag when it is about to do what?

Put out to sea: the Blue Peter goes up in harbour as a recall, telling everyone still ashore to get back on board before the ship leaves.

What is the Morse code for SOS?

Three dots, three dashes, three dots: Germany's 1905 radio rules chose the run because it is hard to mistake, so SOS never stood for 'Save Our Souls', a phrase attached to it later.

Which distress call was devised in the 1920s by a radio officer at London's Croydon Airport?

Mayday: Frederick Mockford needed a spoken equivalent of SOS, and is said to have chosen it for sounding like the French 'm'aider', help me, as his traffic flew mostly to Paris.

The most famous lighthouse of antiquity stood at which city?

Alexandria's lighthouse stood on the island of Pharos, and grew so famous that its name became the word for a lighthouse: 'phare' in French, 'faro' in Italian and Spanish.

Which French physicist gave his name to the stepped, multi-part lens used in lighthouses?

Augustin-Jean Fresnel replaced one thick, heavy lens with rings of thin glass prisms that gather a lamp's scattered rays into a single intense beam.

Which type of boat takes its name from Tamil words meaning 'tied wood', first used of a simple log raft?

Catamaran: Tamil 'kattu-maram' meant tied wood, a raft of lashed tree trunks, and English later moved the word to the unrelated twin-hulled boats of the Pacific.

The word 'kayak' comes from the language of which people?

The Inuit word reached English in the 1750s from Greenland, by way of Danish. Hunters tied their parkas to the rim of the hatch, so the skin-covered boat kept the sea out even when it tipped over.

Which boat is built with a deliberately lopsided hull so that one standing rower with a single oar can keep it straight?

The Venetian gondola bulges out on its left side, which counters both the push of the single oar on the right and the weight of the gondolier standing at the back.

The tall Bermuda rig seen on racing yachts was nicknamed after which radio pioneer?

Guglielmo Marconi: the towering masts needed so many wire stays that sailors thought they looked like his radio transmitter masts, and 'Marconi rig' stuck.

Chinese junks are characterised by which feature that made them safer than Western ships of the time?

Watertight bulkheads split a junk's hull into sealed compartments, so a hole flooded only one of them; Benjamin Franklin proposed building mail ships the same way, 'after the Chinese manner'.

Which oared warship won the Battle of Salamis for the Greeks in 480 BC?

The trireme carried about 170 rowers on three levels and fought by ramming enemy hulls; at Salamis the Greek fleet used it to break the larger armada of the Persian king Xerxes.

Which ships were built alike at both ends, letting their crews reverse without turning round?

Viking longships could simply be rowed the other way, a quick escape from a beach, and they floated in so little water that raiders could land almost anywhere.

Which of Columbus's 1492 ships was the largest and served as his flagship?

Santa María ran aground off Hispaniola at Christmas 1492, so Columbus had her timbers built into a fort that he named La Navidad, Spanish for Christmas.

The Mayflower's Pilgrims, licensed to settle in Virginia, landed instead in which present-day state?

Massachusetts: bound for land near the Hudson River, the ship turned back from dangerous shallows off Cape Cod, and the Pilgrims wrote the Mayflower Compact because they were now outside their permit.

HMS Victory served as whose flagship at the Battle of Trafalgar?

Horatio Nelson was shot on Victory's deck by a French sharpshooter and died below that afternoon, knowing the battle was won; the ship survives in dry dock at Portsmouth.

Which US Navy frigate was nicknamed 'Old Ironsides' after British cannonballs bounced off her hull in 1812?

USS Constitution was duelling HMS Guerriere when a sailor reportedly shouted 'Her sides are made of iron!'; the hull was in fact thick oak.

The Bounty was sent to the South Pacific in 1787 to collect what?

Breadfruit plants were meant as cheap food for enslaved workers in the West Indies; Bligh delivered them on a second voyage in 1793, only for many of the workers to refuse to eat the fruit.

Where did the mutineers finally set HMS Bounty on fire?

Pitcairn Island: the Bounty burned to the waterline there in January 1790, which hid the mutineers from passing ships but left them no way off the island.

The tea clipper Cutty Sark is named after a character in a poem by whom?

Robert Burns's 'Tam o' Shanter' has a witch dancing in a 'cutty sark', Scots for a short shift, and the ship's figurehead shows her clutching the tail she tore from Tam's fleeing horse.

Where has the clipper Cutty Sark sat in dry dock since 1954?

Greenwich, London: a fire tore through her there in 2007, but she was mid-restoration, with her masts and many planks safely in storage, and she reopened in 2012.

Titanic set out on her maiden voyage from which port?

Southampton: minutes after she cast off, the pull of her huge hull snapped the moorings of the liner New York, and the two ships only narrowly missed colliding.

The rules for Titanic's lifeboats were based on a ship's what?

Tonnage: the 1894 rules stopped at 16 lifeboats for any ship over 10,000 tons, so Titanic, more than four times that size, exceeded the law with 20 boats that could seat only about half of those aboard.

The 1985 discovery of Titanic's wreck revealed what about the sinking?

The ship had broken in two: both 1912 inquiries had concluded she sank intact, but the wreck lies in two halves about 600 metres apart, just as some survivors had said.

Which nearby ship saw Titanic's distress rockets but failed to come to her aid?

SS Californian had stopped for the night in the ice, and her only wireless operator switched off and went to bed minutes before Titanic struck, so her officers watched the rockets without hearing a single distress call.

Thor Heyerdahl's 1947 Kon-Tiki raft was built from what?

Balsa logs: Heyerdahl's crew lashed nine trunks together with hemp rope and not a single nail, copying rafts that Spanish conquistadors had sketched centuries earlier.

Thor Heyerdahl's Kon-Tiki raft set out in 1947 to drift to Polynesia from which country?

Peru: the raft drifted for 101 days before smashing onto a reef in the Tuamotu islands, which showed the trip was possible, though DNA and language point to Polynesia being settled from Asia.

As of 2025, which Cunard ship was the only ocean liner still making regular transatlantic crossings?

Queen Mary 2 was built for the North Atlantic rather than for calm cruising waters, with a deep, heavily plated hull that took far more steel than a cruise ship of her size.

The container ship Ever Given blocked which waterway for six days in March 2021?

The Suez Canal: hundreds of ships queued up behind her until days of dredging, a fleet of tugs and a full-moon high tide finally pulled her free.

American trucking boss Malcom McLean changed world trade in 1956 by pioneering which way of moving cargo?

Shipping containers: McLean's converted tanker Ideal X sailed from Newark to Houston with 58 of them on deck, so cargo no longer had to be loaded piece by piece by hand.

Container ship capacity is measured in TEU, which stands for what?

Twenty-foot equivalent unit: shipping boxes come in several lengths, so ports count them all in 20-foot units, and the common 40-foot container counts as two.

The world's first nuclear-powered icebreaker, launched in 1957, was named after whom?

Lenin was also the first nuclear-powered surface ship of any kind, and reactors suited Arctic work, because she could break ice for months on end without calling anywhere to refuel.

The America's Cup is named after a yacht that won an 1851 race around which British island?

The Isle of Wight: America was so far ahead that Queen Victoria, watching, is said to have asked who was second and been told, 'Your Majesty, there is no second.'

The America's Cup trophy is informally known as what?

The Auld Mug is really a Victorian silver ewer with no bottom, so sailing's greatest prize could never hold a drink.

Which canal did France abandon before the United States finished it?

The Panama Canal: disease killed thousands of workers on Ferdinand de Lesseps's sea-level cut, and American engineers instead built locks that lift ships 26 metres to an artificial lake, opening the canal in 1914.

Which New York landmark was run by the US Lighthouse Board until 1901, though too dim to guide ships?

The Statue of Liberty was meant to double as a harbour beacon, but its torch stayed so faint that one newspaper likened it to a glowworm.

Which American author took his pen name from a riverboat leadsman's cry meaning two fathoms of safe water?

Mark Twain was born Samuel Clemens and trained as a Mississippi steamboat pilot; the cry told the pilot the river was 12 feet deep and safe to pass.

The 'mermaids' Columbus reported off Hispaniola in 1493 are widely believed to have been which animals?

Manatees are the usual explanation; Columbus complained that the creatures were not as beautiful as painted and had rather masculine faces.

British sailors earned the nickname 'limeys' from a citrus ration the Royal Navy issued to prevent which disease?

Scurvy comes from a lack of vitamin C, and storing the juice destroyed so much of the vitamin that the navy's lime ration often failed to prevent it.

Which sea in the North Atlantic, named for its floating seaweed, is the only one with no land boundary?

The Sargasso Sea is hemmed in by four ocean currents instead of coasts, and Portuguese navigators named it after the brown weed drifting on its calm surface.

Which Chinese port gave English a verb for drugging or kidnapping men to crew ships short of sailors?

Shanghai was a typical destination for the long voyages that crimps supplied with drugged or kidnapped men; the verb is recorded in American English from 1854.

Which word for gossip began as the name of the drinking-water cask where a ship's sailors gathered to talk?

Scuttlebutt joins 'butt', a barrel, and 'scuttle', the hole cut in it for a dipper; like the office water cooler, it was where a crew swapped rumours.

Which American statesman had the Gulf Stream charted after asking why British mail ships were so slow?

Benjamin Franklin asked his cousin, a Nantucket whaling captain, to sketch its path; the chart was printed in London but mostly ignored by British captains.

Which spirit did the Royal Navy stop issuing to its sailors as a daily ration on 'Black Tot Day' in 1970?

Rum, served as a midday 'tot' of an eighth of a pint, was abolished over fears that strong drink and complex machinery did not mix.

Sailors called pollywogs are initiated before 'King Neptune' the first time their ship crosses which line?

The equator turns a 'pollywog' into a 'shellback'; the rite was once brutal, with novices beaten with wet ropes or even thrown over the side.

Which Swedish warship sank minutes into her 1628 maiden voyage and now fills a Stockholm museum?

Vasa was dangerously top-heavy and capsized in a gust of wind about 1,300 metres into the voyage; she was raised in 1961 with her hull largely intact.

Which merchant ship was found adrift and deserted off the Azores in 1872, her cargo of alcohol intact?

Mary Celeste was still seaworthy and under partial sail; only her single lifeboat was missing, and nobody who had been aboard was ever seen again.

Which Cunard liner was torpedoed by a German U-boat off Ireland in 1915, killing nearly 1,200 people?

Lusitania sank in just 18 minutes, and the deaths of 128 Americans among the victims swung US opinion towards joining the First World War.

Which legendary ghost ship, doomed never to make port, inspired an 1843 opera by Richard Wagner?

The Flying Dutchman was an omen of doom to sailors; in the tale's first printed version, from 1821, her captain swears to round a stormy headland even if it takes until Judgment Day.

Which stormy headland, feared by clipper crews, did Dutch sailors name after their home town in 1616?

Cape Horn honours Hoorn in the Netherlands, home of the ship's master Willem Schouten, who first rounded the southernmost headland of Tierra del Fuego with Jacob Le Maire.

Which name did sailors give the windless tropical belt where the trade winds meet and ships could sit becalmed?

The doldrums could be deadly in the age of sail, when a hot, muggy calm left a crew stranded with wind the only way to cross an ocean.

In Coleridge's The Rime of the Ancient Mariner, the sailor brings disaster on his ship by shooting which seabird?

The albatross had led the ship out of the ice, so the angry crew made the mariner wear its body round his neck, the origin of a phrase for a burden.

In sailors' slang, a drowned seaman or a sunken ship is said to have gone to whose locker?

Davy Jones is the sailors' spirit of the deep, first named in print in 1726; his locker is the ocean floor, the final resting place of the drowned.

Which tentacled monster of Norwegian legend, perhaps inspired by giant squid, was said to drag boats under?

Kraken is first recorded by name in a Norwegian glossary of 1646; a century later Erik Pontoppidan, bishop of Bergen, described the beast in his natural history of Norway.

Which eerie blue glow can appear on a ship's masts and rigging during a thunderstorm?

St. Elmo's fire is named after the patron saint of sailors; it is glowing plasma that discharges from pointed objects and can warn that a lightning strike is imminent.

Which handheld navigation instrument uses two mirrors to measure a star's angle above the horizon?

A sextant takes its name from its frame, an arc of about one sixth of a circle, from the Latin sextans.

Which English clockmaker solved the problem of finding longitude at sea by inventing the marine chronometer?

John Harrison, a joiner by trade, spent decades building sea clocks; his fourth, the watch-sized H4, proved itself on a voyage to Jamaica.

Which star have northern sailors steered by for centuries because it stays almost motionless above the North Pole?

Polaris sits less than one degree from the celestial pole, so the whole northern sky seems to wheel around it while it barely shifts.

Which naturally magnetic mineral, hung so it could turn freely, made the first magnetic compasses?

Lodestone means 'leading stone' in Middle English, a sign of how much early navigators relied on these rare natural magnets.

Which method lets a navigator estimate position from the last known fix, the heading steered and the time elapsed?

Dead reckoning needs no outside reference, but every estimate builds on the one before, so small errors pile up the longer a voyage runs.

The fathom, the sailors' six-foot unit of depth, takes its name from an Old English word for the span of what?

Outstretched arms span about six feet; the same Old English word also meant an embrace, and 'to fathom' later came to mean getting to the bottom of something.

When a ship's crew reports the anchor 'aweigh', often misheard as 'away', what has just happened?

It has left the seabed: to weigh anchor is an old expression for hoisting it, so 'anchors aweigh' reports that the ship is officially under way.

Which knot, sometimes called the king of knots, forms a fixed loop at the end of a rope?

The bowline is prized because it unties easily even after bearing a heavy load, and it appears in a seamanship manual as early as 1627.

Which ship's officer, the foreman of the deck crew, traditionally passes orders with a shrill whistle known as a 'call'?

Boatswain, usually pronounced 'bosun', is the oldest rank in the Royal Navy, and the whistle is still known as the boatswain's call.

The naval rank of admiral comes, by way of Old French, from a word for 'commander' in which language?

Arabic amir, 'commander', is also the root of emir; the title's shift from land to sea probably began in 12th-century Sicily.

Which Royal Navy survey ship carried the newly graduated naturalist Charles Darwin on a voyage around the world?

HMS Beagle was sent to chart coastlines; Darwin, then on his way to becoming a rural clergyman, spent much of the voyage exploring ashore.

Which former coal ship did James Cook command on his first Pacific voyage to Tahiti, New Zealand and Australia?

HMS Endeavour began life as the collier Earl of Pembroke; when she struck the Great Barrier Reef, Cook had to throw her guns overboard to lighten her.

Which ship of Ernest Shackleton sank in Antarctic pack ice in 1915 and was found on the ocean floor in 2022?

Endurance lies 3,008 metres down in the Weddell Sea, where the team that found her reported the wreck in a brilliant state of preservation.

The 1845 Royal Navy expedition lost with HMS Erebus and HMS Terror was trying to complete which Arctic sea route?

The Northwest Passage was not sailed until Roald Amundsen got through in 1906; the wrecks of the two lost ships turned up only in 2014 and 2016.

Which Portuguese navigator opened the first sea route from Europe to India in 1498 by rounding southern Africa?

Vasco da Gama landed near Calicut on the Malabar Coast in May 1498, a decade after a countryman had first rounded Africa's southern tip.

After Magellan was killed in the Philippines, which Basque navigator completed the first voyage around the world?

Juan Sebastián Elcano captained the Victoria, the only one of five ships to finish the circuit, and reached Seville with just 18 of the more than 230 sailors who had set out.

Which Ming dynasty admiral commanded seven treasure-fleet voyages across the Indian Ocean between 1405 and 1433?

Zheng He, a court eunuch born into a Muslim family, brought back a giraffe from East Africa that the Chinese court hailed as a mythical qilin.

Which English explorer was cast adrift by mutineers in 1611 in the vast Canadian bay that now bears his name?

Henry Hudson wanted to press on west after a winter in the ice, so his crew put him, his teenage son and a few sick or loyal men in an open boat; they were never seen again.

Which sailor became the first person to sail around the world alone, finishing in 1898 aboard the sloop Spray?

Joshua Slocum covered more than 46,000 miles in a rebuilt oyster boat; in 1909 he set out in her on a winter cruise and disappeared.

The deepest known point in the oceans is named after which Royal Navy survey ship that first sounded it in 1875?

HMS Challenger crossed the spot by chance when baffling winds pushed her off course near Guam, on an expedition that laid the foundation of oceanography.

Which Nantucket whaleship was rammed and sunk by a sperm whale in 1820, inspiring Herman Melville's Moby-Dick?

Essex sank in the southern Pacific, leaving her crew adrift in small whaleboats; starving on the open ocean, the survivors eventually resorted to cannibalism.

Which bathyscaphe carried Jacques Piccard and Don Walsh to the floor of the Mariana Trench in 1960?

Trieste was designed by the pilot's father, the Swiss scientist Auguste Piccard, and bought by the US Navy two years before the record dive.

The 'women and children first' custom is often traced to which British troopship, wrecked off southern Africa in 1852?

HMS Birkenhead had too few usable lifeboats, so the soldiers aboard stood in ranks while the women and children got away; only 193 of some 643 people survived.

Which German ship, torpedoed in the Baltic in January 1945, was the deadliest single sinking in maritime history?

Wilhelm Gustloff, built as a cruise ship, was evacuating civilians and troops from East Prussia when a Soviet submarine struck; by one estimate 9,343 people died.

Which unit of length, one tenth of a nautical mile, is named after the rope that held a ship's anchor?

A cable was simply the standard length in which anchor ropes were supplied, which had settled at about 100 fathoms by 1555.

Korean admiral Yi Sun-sin fought off Japanese invasion fleets in the 1590s with which spike-roofed armoured warships?

Turtle ships had a roof bristling with iron spikes to stop Japanese boarding parties; whether that roof was also plated in iron is still debated by historians.

Which Confederate submarine became the first to sink an enemy warship in 1864, but never returned to base?

H. L. Hunley had already sunk twice in trials, drowning 13 men including her namesake, Horace Hunley, before she sank USS Housatonic off Charleston.

Which 1571 sea battle off Greece, where Cervantes fought, was the last major clash between fleets of oared galleys?

Lepanto set a Christian fleet of more than 200 galleys against the Ottomans; within decades the sailing galleon had displaced the galley as the main warship.

Which Union ironclad, mocked as a 'cheesebox on a raft', fought CSS Virginia at Hampton Roads in 1862?

USS Monitor introduced the revolving gun turret that later warships copied, yet she foundered under tow in a storm on the last day of 1862.

Which term for a secret reserve of money began as the cash a ship's cook made selling fat scraped from the pots?

Slush fund comes from 'slush', the waste fat of a ship's galley; the cook kept the money from selling it, and on a warship it was shared among the officers.