What is the geomagnetic sensor in the Xiaomi Smart Watch?

The geomagnetic sensor, also known as a magnetometer, is a component in the Xiaomi Smart Watch that detects and measures the Earth’s magnetic field.
For your reference, here are various purposes of the geomagnetic sensor:
1. The geomagnetic sensor can be utilized to provide compass functionality on the smartwatch. This allows you to determine the direction they are facing by sensing the Earth's magnetic field;
2. By detecting changes in magnetic fields, the sensor can contribute to determining the device’s orientation in relation to the Earth’s magnetic poles. This information can be used in navigation apps or outdoor activity trackers to provide you with accurate directional information;
3. In conjunction with GPS and other sensors, the geomagnetic sensor can improve the accuracy of map applications by providing additional data for orientation and direction, especially in situations where GPS signals may be weak or unavailable (such as indoors or in urban canyons).