Enable Compass Calibration in the settings app In iOS 13 there is a privacy setting to allow your compass to use location services to help calibrate your devices compass. By default, this setting is disabled. Enabling this feature is highly recommended for good compass accuracy.
Compass calibration is just that, it helps calibrate the compass on the iPhone so it is accurate. Motion and distance is what allows your iPhone to calculate steps, distance, stair-climbing, etc.
It is not necessary to recalibrate the compass when the vehicle is flown at a new location because ArduPilot includes a “world magnetic model” which allows converting the location's magnetic North to true North without recalibrating .
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Compass calibration works by detecting the magnetic field intensity of earth. But sometimes due to strong interference from other electronic devices like transformers, compass sensor may get wrong idea about the magnetic poles of earth and can point in wrong direction.
If the beam's range is too vast, Google Maps will usually ask you to calibrate your compass. If it doesn't, you need to calibrate it manually.
Calibration of the digital magnetic compass is an essential and critical step before actually using the compass. Many times, it has been observed that users tend to skip this step which is a highly unsafe practice. The compass should be re-calibrated if the soft or hard iron sources of error in the vicinity change.
We recommend you recalibrate it so the compass will work properly. The Compass app offers this option when it feels it's necessary. To force it, turn off your iPhone and turn it back on.
You can also calibrate the compass on Android to improve Google Maps. Here's how: Open the Settings app and tap Location. Make sure Location is toggled to On.
Go into Settings/Privacy/Location Services. Scroll down and tap on System Services. There's a switch to toggle Compass Calibration on/off.
Compass calibration. The electronic compass shows you which direction you're facing when you use maps and navigation apps. The calibration service uses location data to make compass more accurate, so don't turn it off.
It's not a necessary function, so you are free to disable it. Compass calibration. The electronic compass shows you which direction you're facing when you use maps and navigation apps. The calibration service uses location data to make compass more accurate, so don't turn it off.