What are the uses of compasses? What are the uses of compasses?

In ancient times, the compass was used for ritual, military, divination and determining the direction when watching Feng Shui. Because the north pole of the compass points to the south pole of geography, the compass can be used to identify the direction, so it is often used in navigation, geodesy, travel and military.

What is a compass?

Compass was also called Sina in ancient times. Its main component is a magnetic needle mounted on the shaft. Under the action of natural geomagnetic field, the magnetic needle can rotate freely and keep in the tangential direction of magnetic meridian. The south pole of the magnetic needle points to the geographical south pole, so this property can be used to identify the direction.

Compass is the result of China ancient working people's understanding of magnet magnetism in long-term practice. As one of four great inventions of ancient china, its invention has played an inestimable role in the development of human science, technology and civilization. In ancient China, the compass was first used for rituals, etiquette, military affairs and divination, and to determine the orientation when looking at geomantic omen.

The purpose of compass

1, the compass can help you find the direction in your daily life. Modern people have made all kinds of electronic compasses and used them on mobile phones. Although GPS is widely used in navigation, its accuracy is greatly reduced or even unusable because its signals are often blocked by terrain and objects. The electronic compass can effectively compensate the GPS signal, ensure that the navigation azimuth information 100% is effective, and it can work normally even if the GPS signal is out of lock, so as to achieve "no loss of direction when the star is lost".

2. Compass can be used for geodesy. In modern society, compass is not only used for navigation, but also widely used in land surveying and mapping, area measurement and so on. Using a compass can make the orientation of the map consistent with the actual terrain.

3. Compass can be used to measure height. Height measurement requires professional electronic instruments, but at present, the compass in general mobile phones can also achieve the function of height measurement. As long as you turn on the built-in compass of the mobile phone, you can display the local altitude and other data.