Nautical Trivia
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99 free Nautical trivia questions with answers — trivia quiz, new questions added Oct 2026.
50 free nautical trivia questions with answers. Whether you sail, fish, cruise or just like a good sea story, this nautical trivia set covers the water from every angle. It ranges from boat basics (why port is on the left, what a knot measures, how many bells make a watch) to the famous vessels of history: the Mayflower, HMS Victory, USS Constitution, the Bounty, the Cutty Sark, Titanic, Kon-Tiki, Queen Mary 2 and the container ship that got stuck in the Suez Canal. The easy questions ask what a keel is and which side is starboard. The hard ones want the length of a nautical mile, the origin of 'mayday', the physicist who built the lighthouse lens, the Tamil word behind 'catamaran' and where the oldest boat in the world was found. Built for pub quizzes, yacht-club nights, cruise-ship trivia and anyone who knows their poop deck from their crow's nest. Every answer was checked against Wikipedia's articles on the vessels, terms and events, and each question carries the sentence that backs it up.
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Q 01In modern naval terms, what qualifies a vessel as a boat?
It can be carried aboard a ship
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.
Q 02The world's oldest known boat, the Pesse canoe found by Dutch road builders, was made from what?
A hollowed pine log
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.
Q 03Which colour of navigation light does a ship show on its starboard side at night?
Green
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.
Q 04Why was the steering oar of early ships mounted on the starboard side?
Most people are right-handed
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.
Q 05Before 'port', the left side of a ship was known by what name?
Larboard
Larboard, possibly from a Middle English word for the loading side, was too easily mistaken for starboard, so the Admiralty ordered 'port' used instead.
Q 06The nautical mile was originally defined as one minute of what?
Latitude
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.
Q 07A knot is a unit of what?
Speed
Speed: one knot is one nautical mile per hour. Aircraft use knots as well, because pilots also navigate in nautical miles.
Q 08The nautical unit called the knot is named for knots that sailors tied in what?
A trailing line
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.
Q 09Which Royal Navy officer devised the wind-force scale that still bears his name?
Francis Beaufort
Francis Beaufort needed no instruments: he defined each force of wind by what it did to the sails of a Royal Navy frigate.
Q 10Which part of a ship is the long structural beam running along its very bottom?
The keel
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.
Q 11What is the lowest compartment of a ship, where water collects, called?
The bilge
The bilge gathers water so foul with oil and waste that 'bilge' became slang for nonsense.
Q 12The 'poop deck' takes its name from a French word meaning what?
Stern
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.
Q 13On a ship, what did eight bells traditionally mark?
End of a watch
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.
Q 21Which type of boat takes its name from Tamil words meaning 'tied wood', first used of a simple log raft?
Catamaran
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.
Q 22The word 'kayak' comes from the language of which people?
Inuit
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.
Q 23Which boat is built with a deliberately lopsided hull so that one standing rower with a single oar can keep it straight?
The Venetian gondola
Q 14Where on a ship is the crow's nest?
Upper part of the main mast
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.
Q 15What does the Plimsoll line painted on a ship's hull indicate?
Its maximum legal loading depth
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.
Q 16A ship in harbour hoists the blue-and-white Blue Peter flag when it is about to do what?
Put out to sea
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.
Q 17What is the Morse code for SOS?
Three dots, three dashes, three dots
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.
Q 18Which distress call was devised in the 1920s by a radio officer at London's Croydon Airport?
Mayday
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.
Q 19The most famous lighthouse of antiquity stood at which city?
Alexandria
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.
Q 20Which French physicist gave his name to the stepped, multi-part lens used in lighthouses?
Augustin-Jean Fresnel
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.
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.
Q 24The tall Bermuda rig seen on racing yachts was nicknamed after which radio pioneer?
Guglielmo Marconi
Guglielmo Marconi: the towering masts needed so many wire stays that sailors thought they looked like his radio transmitter masts, and 'Marconi rig' stuck.
Q 25Chinese junks are characterised by which feature that made them safer than Western ships of the time?
Watertight bulkheads
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'.
Q 26Which oared warship won the Battle of Salamis for the Greeks in 480 BC?
Trireme
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.
Q 27Which ships were built alike at both ends, letting their crews reverse without turning round?
Viking longships
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.
Q 28Which of Columbus's 1492 ships was the largest and served as his flagship?
Santa María
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.
Q 29The Mayflower's Pilgrims, licensed to settle in Virginia, landed instead in which present-day state?
Massachusetts
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.
Q 30HMS Victory served as whose flagship at the Battle of Trafalgar?
Horatio Nelson
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.