How to use a compass on a Xiaomi Redmi smartphone: from calibration to accurate orientation

Why you need a compass in a smartphone and how it works on Redmi

Modern smartphones Xiaomi Redmi are equipped not only with powerful processors and cameras, but also a full set of sensors, among which is a magnetometer (digital compass). This module allows you to identify the points of light with precision to several degrees, which is useful not only for tourists but also for urban residents. GPS-signal is weak (in the subway or between high-rises), or when setting antennas for the TV on a satellite signal.

Unlike a classic arrow compass, a smartphone uses data from a three-axis magnetometer that interacts with the Earth's magnetic field. However, the accuracy of the readings depends on the correct calibration of the sensor and the absence of interference — metal objects, electronics or even magnetic cases. In this article, we will discuss how to turn on a compass on a Redmi, calibrate it for maximum accuracy and avoid typical errors.

It’s important to understand that not all Redmi models have a hardware magnetometer, for example, budget devices like the Redmi A1 or Redmi 9A can do without it, while the flagship Redmi Note 12 Pro+ or Redmi K60 are equipped with a full set of sensors. You can check for a compass through special applications or system tests – this will be discussed below.

How to check if there is a compass in your Xiaomi Redmi

Before you set up a compass, make sure your device is equipped with one. There are several ways to check:

• 🔍 Through the model specifications: go to the official Xiaomi website or a service like GSMArena, find your Redmi model and check the Sensors section.
• 📱 Using the built-in test: enter the code ##4636## in the phone application, go to the Hardware Testing menu and select Sensors. If there is a magnetic field on the list, the compass is present.
• 📲 Through third-party applications: install Sensor Box or Hardware Info. They will show all available sensors, including the magnetometer.

If the sensor is not available, applications that use GPS to determine the cardinal points (such as Compass GPS) will be an alternative, but their accuracy is lower, especially in urban settings.

⚠️ Note: Some Chinese versions of Redmi (e.g. for the Indian market) may have a software-level magnetometer disabled, in which case unlocking the bootloader and firmware on the global version will help. MIUI.

Step-by-step: how to turn on and use the compass on Redmi

In most Xiaomi Redmi models, the compass is integrated into the standard Compass app. If it is not on the home screen, follow the following steps:

1. Open the app menu (swipe up from the bottom of the screen) and find the icon with the compass arrow. If the app is missing, install it from AppGallery or Google Play.
2. Launch the app. When you first open it can ask for permissions to access geodata and sensors, be sure to confirm.
3. Wait for the calibration. The smartphone will ask you to rotate it in space along the trajectory of the "eight" (more about this in the next section).
4. Use a compass: the arrow will point north (N), and the numbers below will show azimuth in degrees. For accuracy, hold the phone horizontally (parallel to the ground).

In some firmware, the MIUI compass is built into the Weather app to find it:

1. Open the weather → Swipe left to the Sun/Moon section.
2. Slip the compass icon in the upper right corner.

Make sure there are no magnets or metal objects nearby.|

Enable geolocation (GPS) to improve accuracy |

Battery charge should be above 20% (low charge can distort readings)|

Update the Compass app to the latest version-->

Calibration of the compass: why it is important and how to do it correctly

An uncalibrated compass on Xiaomi Redmi can show error up to 45-90 degrees, especially after a phone drop or firmware update. Calibration is needed to reset accumulated sensor errors.

• 📍 Place: Calibrate in open areas, away from power lines, cars or reinforced concrete structures.
• 🔄 Movement: the phone must be rotated smoothly, describing in the air the sign of infinity (∞) Or eight. Abrupt movements will cause a failure.
• ⚡ Interference: Remove the case with a magnetic mount, move away from laptops, speakers or other electronic devices.

Calibration instructions:

1. Open the Compass app.
2. If the arrow twitches chaotically or shows Calibration..., start rotating the phone along the trajectory of the "eight" (see video below).
3. Wait for the message Calibration completed or stabilization arrow.
4. Check accuracy: Compare readings with a standard compass or map (e.g., in Google Maps).

If calibration doesn’t help, try resetting the sensor settings:

1. Go to Settings → Applications → Application Management.
2. Find the Compass, open the Warehouse and click Clear Data.
3. Reboot the phone and recalibrate.

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If the compass is still lying after calibration, try to turn off the power saving mode - it can limit the operation of the sensors.

Top.-5 Compass applications on Xiaomi Redmi (with accuracy comparison)

Xiaomi’s standard Compass app is suitable for basic tasks, but often lacks functionality. Below is a comparison of alternatives with specific features and accuracy:

For hikers and hunters, Compass GPS is the best choice, combining accuracy with navigational features. If you want minimalism, Digital Compass is the best option, but consider its inaccuracies.

⚠️ Note: Metal detector applications (e.g. Metal Detector) use the same magnetometer as the compass, and their simultaneous use can distort the readings of both instruments.

Common Compass Problems on Redmi and Their Solutions

Even after calibration, the compass may not work properly, and consider the typical failures and ways to fix them:

• 🔄 The arrow twitches or spins randomly: magnetic interference is often the cause. Remove the phone from the magnetic field sources (speakers, chargers, bank cards). If the problem remains, recalibrate the sensor.
• 📵 Compass does not respond to movement: check if the sensor is disabled in the settings. Go to Settings → Special facilities → Sensors and make sure the magnetometer is active.
• 🔋 The readings are lost when the battery is low: at a charge level below 15%, the system can restrict the operation of the sensors.
• 🔄 After updating MIUI Compass stopped working: reset the Compass application settings (as described above) or roll back to the previous firmware version via Fastboot.

If none of these things worked, it could be hardware, like when the phone fell, the magnetometer could shift or the contacts would oxidize, and you'd need a diagnostic at a service center, and you could use the test code to check the sensor's performance.

adb shell dumpsys sensorservice

In the output, look for the AK09911C Magnetometer string (or similar string), if it is not available, the sensor is defective.

Practical tips: how to use a compass on Redmi in hiking and the city

A compass on a smartphone is not just a toy, but a complete tool for orientation, and here are some practical scenarios for using it:

• 🗺️ Map orientation: align the edge of the phone with the line on the paper map, then turn so that the compass needle points north.
• 🏙️ Navigation in a city without GPS: in the subway or underground passages, determine the direction of movement by compass (for example, "going to the north-east"), and on the surface check the map.
• 📡 Satellite antenna setting: use compass and azimuth data to accurately align the dish to the satellite (you can find them on the DishPointer website).
• 🌄 Sun time: at noon, the sun is in the south (in the Northern Hemisphere), and you can use a compass to estimate the time, knowing that the sun is shifting by 15 hours.°.

To improve accuracy, combine the compass with other tools:

• Use it. GPS-Applications (e.g. Locus Map) to obtain coordinates.
• Download offline maps in advance (in Google Maps or Maps.me).
• Map landmarks (rivers, hills) and check them with a compass.

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In emergency situations (such as in a forest without communication), the compass on the Redmi can be the only reliable orientation tool.

FAQ: answers to frequent questions about the compass on Xiaomi Redmi