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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11There is no single heading-accuracy figure for MEMS sensors. A compass system’s result depends on its magnetometer, tilt compensation, calibration, installation, local magnetic interference and sensor-fusion software. A gyroscope can help track attitude during motion, but it does not remove magnetic interference or guarantee correction for acceleration, deceleration and turns.
What determines heading accuracy?
A MEMS-based electronic compass generally estimates heading from a three-axis magnetometer measuring the local magnetic field. Because tilting changes how that field appears on the sensor’s axes, the system uses an attitude estimate—often derived from accelerometer data—to compensate for tilt. The result is an estimate from a complete sensor-and-software system, not a performance figure that follows from the MEMS label alone.
Accuracy depends on whether the system can separate the Earth’s field from fields and distortions introduced by its surroundings, and whether its calibration and fusion algorithms match the actual installation and motion. A sensor’s resolution or a gyroscope’s performance by itself does not establish the heading accuracy of the assembled device.
Why can a compass be wrong even when the sensor works?
Hard-iron and soft-iron effects
Magnetic interference is a system-level error source. Hard-iron effects add a magnetic offset, while soft-iron effects change the measured field’s magnitude or direction. Permanent magnets, current-carrying conductors and nearby ferromagnetic parts can contribute. The sensor’s position relative to motors, wiring, batteries and structural metal therefore matters.
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Calibration can model repeatable distortions in a fixed assembly. Analog Devices notes that static corrections assume the distortion source stays fixed relative to the magnetometer. If wiring, a battery, payload or metal hardware changes, the magnetic environment can change too; a correction that suited the previous arrangement may no longer be suitable.
Tilt and motion
Tilt compensation depends on a useful attitude estimate. Accelerometer information can help determine tilt, and a gyroscope can update attitude during motion. But gyro fusion does not make a corrupted magnetic measurement trustworthy: the gyroscope measures angular rate, not the source of a magnetic disturbance.
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Nor does the presence of a gyroscope guarantee that acceleration, deceleration or turning errors are corrected. In an Analog Devices EngineerZone response concerning the ADIS16448, the answer says users need to develop their own algorithms for those corrections so they can tune them to their requirements. Correction behavior is implementation-specific.
What accuracy figures do manufacturers state?
The published figures below refer to different products and conditions. They are useful evidence about those specific systems, not a head-to-head comparison or a universal MEMS-compass specification.
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| Source and context | Published statement | How to interpret it |
|---|---|---|
| NXP eCompass fact sheet; publication year not stated in the available record | Heading accuracy “within five degrees” on a correctly laid out circuit board | A vendor claim for the described eCompass software with the stated board-layout condition; not a general sensor specification. |
| STMicroelectronics application note AN3192 for the LSM303DLH; publication year not stated in the available record | “Below 2°” with the calibration procedure described in the note | A claim tied to that named device and procedure, not a result that can be assumed for other sensors or installations. |
| Honeywell HMC6343 product description | Tilt-compensated operation up to a ±60° tilt range | A stated operating range, not an accuracy figure or cross-vendor comparison. |
These claims use different hardware, software and conditions, so their numbers should not be ranked as if they came from the same test. The cited manufacturer material does not establish one broadly applicable accuracy value, and it does not provide an independent head-to-head benchmark for MEMS heading systems.
Does a gyro correct heading while accelerating or turning?
Not automatically. A gyro can propagate an attitude estimate between other sensor updates and support dynamic operation. Whether the system compensates for motion-related errors depends on its fusion and correction algorithms. A magnetometer remains vulnerable to changing magnetic fields, and a gyro cannot identify or cancel every such disturbance on its own.
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The ADIS16448 response from Analog Devices EngineerZone specifically leaves acceleration, deceleration and turning corrections to customer-developed algorithms. Analog Devices’ ADIS16480 application note also describes application-specific observations and adjustments when tuning its filter. Treat a gyro as one input to a designed system, not as a blanket guarantee of corrected heading.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should you compare MEMS heading systems?
Compare systems only when their conditions and metrics are comparable. A stated accuracy is useful only if you can tell what hardware and software produced it, how it was calibrated, how it was mounted, and whether the result applies while stationary, tilted or moving.
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- Architecture: Determine whether you are evaluating a discrete magnetometer and accelerometer with application software, or an integrated compass module with its own fusion and calibration firmware.
- Calibration: Check whether the procedure addresses hard-iron offsets only or also soft-iron and installation effects, and whether it is performed on the assembled device.
- Operating conditions: Look for the stated tilt range, static or dynamic use, magnetic environment, calibration conditions and accuracy metric. Do not compare a tilt-range claim with an accuracy claim.
- Integration requirements: Check package and interface, available code or algorithms, processor needs and whether the sensor can be located away from likely magnetic interference.
NXP describes eCompass software and recommended sensor families; ST documentation describes tilt-compensated eCompass computation, ellipsoid or sphere fitting for calibration, and use of gyroscope data to update tilt and eCompass. Honeywell describes an integrated tilt-compensated HMC6343 module. These are different integration choices, not a universal ranking.
How can you improve the result in your own device?
- Choose a location deliberately. Place the magnetometer as far as practical from likely sources of interference, including motors, current-carrying conductors, magnets and structural metal. The field at the sensor—not just the nominal sensor specification—affects the result.
- Calibrate the final assembly. Use the procedure intended for the sensor and device, with the installed wiring, battery, payload and metal parts in place. Calibration performed before those elements are added may not represent the finished system.
- Use tilt compensation appropriate to the application. Confirm that the software obtains a useful attitude estimate and that its documented tilt behavior matches how the device will be used.
- Inspect dynamic correction separately. If the device accelerates, decelerates or turns, establish whether its algorithm handles those conditions. Do not infer that it does so merely because the module includes a gyroscope.
- Revisit calibration after changes. If installation or nearby materials change, reassess the magnetic environment and follow the vendor’s calibration guidance for the updated assembly.
Calibration can improve a system, but it cannot justify a generic accuracy promise. It is specific to the sensor, procedure and magnetic environment for which it is performed.
Which type of system makes sense?
| Option | Potential advantage | What to verify |
|---|---|---|
| Discrete magnetometer, accelerometer and application software | More control over placement, calibration and fusion implementation. | Whether you can implement and validate calibration and dynamic corrections, and whether the board layout keeps magnetic interference manageable. |
| Integrated tilt-compensated compass module | May provide sensor fusion and calibration firmware in a compact module. | Its interface, calibration support, tilt behavior, available tuning and the conditions attached to any accuracy claim. |
For prototyping, a three-axis magnetometer compass module or tilt-compensated e-compass development module is a reasonable category to investigate. The category alone does not establish suitability: check the module’s interface, calibration support, tilt behavior and stated test conditions before choosing it.
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