Since when had the magnetic compass been known, though sailors only used it for unknown-ocean voyages from the fifteenth century?

1380. The magnetic compass had been known since 1380, but was only used for voyages into unknown areas from the fifteenth century onward.Read more: WorldHist0059 — European Voyages of Exploration: Columbus and the Atlantic Crossing

European Voyages of Exploration: Columbus and the Atlantic Crossing

Columbus sailed for 33 days without sighting anything but sea and sky. His crew demanded he turn back before land finally appeared.

This article covers why Europeans sailed into unknown oceans, and Columbus’s 1492 voyage across the Atlantic.

A 1519 portrait traditionally said to depict Christopher Columbus, by Sebastiano del Piombo. No confirmed portrait made during his lifetime survives. Public domain, Metropolitan Museum of Art, via Wikimedia Commons.

📑 Contents

1New Tools for Navigation
2Ptolemy’s Geography Returns
3Three Motives: Economic, Religious, Political
4Portugal and Spain Take the Lead
5Columbus’s Atlantic Crossing
6Why “America” Isn’t Named After Columbus
7Not Really the First Voyages
8Timeline: Voyages by Europeans
9The Pattern Examiners Keep Testing: Voyage Chronology

🏛️ Must Know

Ptolemy’s Geography Returns

1477Ptolemy’s Geography, written 1,300 years earlier, became available in print in 1477 and was then widely read.
Three ContinentsReading Ptolemy gave Europeans a picture of a world with three continents: Europe, Asia and Africa.
A Fatal ErrorPtolemy correctly argued the world was spherical, but badly underestimated how wide the oceans actually were.
Reckless ConfidenceBelieving the Atlantic crossing would be short, many Europeans were willing to sail recklessly into unknown seas.

Three Motives: Economic, Religious, Political

Economic DeclineEurope’s economy declined from the mid-fourteenth to mid-fifteenth centuries. Plague and war caused depopulation and a shortage of gold and silver.
Trade BlockedLong-distance trade became harder after the Turks conquered Constantinople in 1453, raising taxes on trade with Asia.
Religious MotiveThe chance to bring many more people into Christianity made devout Europeans eager to face the adventure.
Political MotiveIf trade could be followed by political control through colonies, European countries stood to benefit even further.

Portugal and Spain Take the Lead

Prince HenryPrince Henry of Portugal, called the Navigator, organised the coasting of West Africa and attacked Ceuta in 1415.
West African TradePortugal established a trading station at Cape Bojador, where gold dust was found and Africans were captured and enslaved.
CapitulacionesIn Spain, contracts called capitulaciones let expedition leaders claim titles and governing rights over any territory they conquered.
Fresh From the ReconquistaSpain had just completed the Reconquista in 1492, reclaiming the Iberian Peninsula from Arab rule. This fed the ambition behind Spain’s ocean voyages.

Columbus’s Atlantic Crossing

The FleetColumbus set sail on 3 August 1492 with a small fleet: the nao Santa Maria and two smaller caravels, Pinta and Nina.
33 DaysThe fleet sailed 33 days without sighting anything but sea and sky, and the restless crew demanded a return home.
LandfallOn 12 October 1492, they reached the island of Guanahani in the Bahamas, which Columbus believed was part of India.
Warm WelcomeThe Arawaks welcomed them generously with food and provisions, a generosity that deeply impressed Columbus.

📘 Good to Know

Why “America” Isn’t Named After Columbus

Still ConfusedColumbus never realised he had found a new continent. Three more voyages followed before this became clear.
Amerigo VespucciThe continents were instead named after Amerigo Vespucci, a Florentine geographer who recognised how large they truly were.
The Name “America”The name “America” itself was first used by a German publisher in 1507.

Not Really the First Voyages

Older CrossingsHistorians note these were not really the first “Old World” voyages to unknown lands.
Other NavigatorsArabs, Chinese, and Indians had navigated vast ocean stretches, as had Polynesian and Micronesian sailors of the Pacific islands.
The VikingsVikings from Norway had already reached North America, centuries earlier, in the eleventh century.

Timeline: Voyages by Europeans

1492-1500Columbus claimed the Bahamas and Cuba for Spain in 1492. Vasco da Gama reached Calicut in 1498, and Cabral claimed Brazil for Portugal in 1500.
1513-1522Balboa crossed Panama and sighted the Pacific in 1513. Magellan’s expedition completed the first circumnavigation of the globe in 1522.
1600-1602The British East India Company formed in 1600, followed by the Dutch East India Company in 1602.

Exam Point of View

The Pattern Examiners Keep Testing: Voyage Chronology

WhyExams like arranging voyages of exploration in chronological order, since the dates are precise and easy to verify.
QuestionNDA asked test-takers to arrange four events: Vasco da Gama reaching Calicut, Magellan’s circumnavigation, and the founding of the British and Dutch East India Companies.
WhyThe correct order is Vasco da Gama (1498), Magellan (1522), British East India Company (1600), then Dutch East India Company (1602).
LinkSource: NDA & NA (I) 2026, General Ability Test (see Q122).

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