How to see the southeast and northwest with the longitude of the mobile phone compass?

1. The mobile phone super compass is a simple instrument for judging the orientation, which is often used in navigation, geodesy, tourism and military affairs. The mobile phone compass eliminates the inconvenience of carrying a compass instrument, and it is simple and convenient to put the instrument into the mobile phone.

2. The mobile phone compass does not rely on GPS or built-in gyroscope. It just uses the simplest compass principle, that is, sensing the earth's magnetic field. The difference is that the electronic compass of the mobile phone uses a magnetoresistive sensor instead of a magnetic needle, and then converts the sensed geomagnetic information into a digital signal and outputs it to the user.

You can do an experiment. Using magnets near mobile phones will interfere with pointing.

Compass, called Sina in ancient times, is mainly composed of magnetic needles installed 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 (magnetic north pole), and the direction can be distinguished by using this property.

It is often used in navigation, geodesy, tourism and military affairs. The invention of the compass with physical direction indication has three parts, namely Sina, compass and magnetic needle, all of which belong to the invention of China. [1] According to ancient mine records, it first appeared in the Cishan area during the Warring States period. [2]

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.