CD60 backlit large screen car dual thermometer car compass thermometer calendar clock multi-function 5-in-11. The compass reading is easily affected by magnetic interference sourcesIn order to correctly display the angle and orientation of the current compass direction, this product should be placed horizontallyPlease isolate your digital compass from magnets or objects with magnets, such as: mobile phones, horns, motors, monitors, etc.This compass, like most other compasses, points to the north magnetic pole and the direction of pointing will be slightly different from the north and south poles, see the magnetic declination section.To achieve the correct results, avoid the followingA digital compass is too close to a magnetic objectThe digital compass is too close to the metal objectDigital compasses are too close to electronics.What is magnetic declination?-There is a slight deviation between the north magnetic pole and the positive north pole, which most magnet compasses refer toTo the north magnetic pole, on the contrary, all measurements are based on a map of the north pole.- The angle between the north pole and the positive north pole is called the declination, and the numerical value of the declination angle (degreesand points) and direction (east and west) depending on your location.- Strict compass users or users who want to get precise navigation must adjust the compensationMagnetic declination. Calibration of the product:1. Just put on the battery or reset and feel that the product is subject to electromagnetic interference and the orientation angle of the product is deviated; As well as using the compass in one geographic location after calibrating into another, farther away location requires calibration of this product.2. Press and hold the COMPASS key for 3 seconds until the "CAL" character is displayed, and enter the compass screen to display the correction.3. Place the compass flat on the horizontal plane, and then rotate the compass in the clocked direction for one week, and each direction of the compass ensures that it can be displayed slowly and stably4. After spinning for one week, press the "COMPASS" key to return to compass mode and start measuring.5. When the power supply is off (there is no backlight at this time), when the car product works for 10 minutes, the compass enters the sleep state, at this time the compass degree is displayed, at this time press the DOWN button for 3 seconds or the power supply on the car is repowered, and the compass starts working again. When the compass goes to sleep (the compass does not have a degree display, the display is -- --), if the product is moved, the compass needs to be corrected again.Battery: CR2032 coin cell battery (not included)Packing List:1 x Car Thermometer1 connector1 handle1 Manual