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Magnetic Compasses and Navigation Systems

History

Before magnetic compasses became popular, mariners used the position of the stars for navigation. They used the position of a northern star called Polaris as the reference point. This method of navigation came with its challenge. It was quite difficult for sailors to study the stars on cloudy or foggy days. In the 12th Century, European and Chinese mariners discovered that when a lodestone (the first magnet to be discovered) is floated on a stick in water, it aligns in the north-south direction. In addition, they discovered that when a lodestone touches an iron needle for a long time, the needle also aligns in the north-south direction. Hence, to find any other direction, all one needs to know is which way is north.

Mechanism

Magnetic compasses are efficient because the Earth acts as a large bar magnet, lying in the north-south direction. This causes other smaller magnets to lie in the same direction. The magnet’s north pole is not the same as the Earth’s geographic north pole. There exist some discrepancies.

Challenges of Magnetic Compasses

There is no doubt that magnetic compasses have made navigation a lot more efficient. However, this method of navigation still comes with its challenges. The magnetic compass is stable at the equator. However, at the earth's magnetic pole, you begin to notice some variations. As the magnet gets closer to the Earth’s magnetic pole, the difference between the magnetic pole and the geographic pole increases. In addition, magnetic fields other than the Earth’s magnetic field can affect the magnetic compass. Magnetic compasses are likely to make errors when affected by an external magnetic field. This is common in aircraft and ships because they are made of metals. To counteract this magnetic hull, the compasses used in modern ships are placed on binnacles, containing magnets and steel pieces. Magnetic compasses are also error-prone when one turns from a particular direction. This is because the compass lags behind the turn.

Evolution of Magnetic Compasses

Modern compasses have liquids in their capsules. This makes the magnetic needles more stable. In addition, the needles are made with phosphorescent materials. This makes it possible to read a magnetic compass even in the dark. In modern magnetic compasses, one may also find map scales and magnifiers. The map scales are used to plot maps and measure distances more accurately while the magnifier is used to determine the bearing of distant objects more accurately. Compass

Types of Magnetic Compasses

Prismatic Compass

As the name implies, this type of magnetic compass has a triangular prism that can be used to make more accurate observations. It also has a ruler and a source of light. The ruler is used for plotting while the source of light is used as a backup in case there is poor lighting. The military often uses this type of magnetic compass.

Liquid Compass

In this type of magnetic compass. The magnetized needle is in a capsule filled with liquid. The liquid could be mineral oil, kerosene, or alcohol.

Qibla Compass

Muslims commonly use this type of compass. The compass points in the direction of Mecca. Muslims use it during prayer.

Thumb Compass

Just like the name implies, this type of magnetic compass is fixed on the thumb. It is usually used in orienteering. Orienteering is a sport that involves map reading.

Solid-state Compass

This type of magnetic compass is found in electric devices. They have about three magnetic field sensors. Microprocessors use these sensors to determine the orientation of the device.

Conclusion

Magnetic compasses and navigation systems have played a huge role in aiding travel. The invention of magnetic compasses helped to overcome the challenges of some of the more primitive navigation systems. If you want to learn more about magnetic materials, we would like to advise you to visit Stanford Magnets for more information.
About the author

Cathy Marchio

Cathy Marchio is an expert at Stanford Magnets, where she shares her deep knowledge of magnets like Neodymium and Samarium Cobalt. With a background in materials science, Cathy writes articles and guides that make complex topics easier to understand. She helps people learn about magnets and their uses in different industries, making her a key part of the company's success.

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