What is a compass used for?

A compass is a device that uses the Earth’s magnetic field to indicate directions. Thanks to the magnetic needle inside it, the compass always points north, enabling people to navigate without losing their way on land or at sea.

The Earth behaves like a giant magnet, with its north and south poles functioning similarly to those of a magnet. The thin magnetic needle inside the compass aligns itself with this magnetic field in a north-south direction. The end of the needle that points north allows users to determine the other directions: south, east, and west.

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• The first compass was used in China before the Common Era. Early versions relied on a lodestone, a naturally magnetic stone, floated in a bowl of water to determine direction.
• From the 9th century onward, the Arab and Islamic world improved the compass and began using it in navigation.
• During the Middle Ages, the compass reached Europe and became the most important tool for sailors during the Age of Geographic Exploration.
• Modern compasses have become small portable and highly precise instruments.

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• Maritime navigation: One of the most reliable methods for determining direction in open seas.
• Land travel and hiking: Used with maps to prevent getting lost.
• Mountaineering and camping: Used to find direction in areas where GPS signals are unavailable.
• Military applications: The compass remains a fundamental tool in operational planning.
• Cartography: Used alongside maps for field measurements.
• Education: Used in schools to teach directional awareness.

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Today, many people find their direction using digital compasses in smartphones. However, these digital compasses still operate using sensors that detect the Earth’s magnetic field. Modern devices replace the traditional magnetic needle with electronic components.

Thus, despite technological advances, the fundamental principle of the compass has remained unchanged for centuries: “Indicate magnetic north.”

Materials:

• A needle
• A magnet
• A small container of water
• A small piece of foam or cork

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How to make it:

1. Rub the needle several times in one direction with the magnet (magnetize it).
2. Attach the needle to the piece of foam.
3. Place the foam on the surface of the water.

What happens?

The needle rotates and points toward magnetic north!

Note: It is possible to determine direction without electricity or technology!

• TÜBİTAK Bilim Genç. “The Invention of the Compass.” https://bilimgenc.tubitak.gov.tr/pusulanin-icadi
• TÜBİTAK Bilim Genç. “From a Sewing Needle to a Compass.” https://bilimgenc.tubitak.gov.tr/makale/dikis-ignesinden-pusula
• Türkiye Diyanet Vakfı İslâm Ansiklopedisi. “Compass.” https://islamansiklopedisi.org.tr/pusula
• National Geographic Education. “Compass.” https://education.nationalgeographic.org/resource/compass/
• YouTube. “What Is a Compass and How to Make One?” Science and Technology Videos. https://www.youtube.com/watch?v=G719g7LhJlo