> For the complete documentation index, see [llms.txt](https://drotek.gitbook.io/additional-devices/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://drotek.gitbook.io/additional-devices/sensors/geomagnetic-sensor/rm3100.md).

# RM3100

![](/files/-L_Ni9ovkXiLGpHwEvnj)

[Professional Grade Magnetometer RM3100](https://store-drotek.com/893-professional-grade-magnetometer-rm3100.html) by Drotek is a ready-to-use and operational module that eliminates any noise in your magnetic field measurements for accurate heading and orientation calculations. This sensor is a heading reference to your drones so it can navigate through waypoints and eliminate magnetic disturbances due to motor coils and metal parts.

This 3-axis magnetometer, based on PNI’s proprietary magneto-inductive technology, delivers high-performance resolution and repeatability, with over 10 times better resolution and over 20 times lower noise than the leading Hall Effect sensor. 

Professional Grade Magnetometer RM3100 provides a very high level of resolution (10 nT), with low power consumption and no hysteresis and can be used for applications that require high accuracy.

## How to position the sensor?

Refer to the **schema** on your sensor module with X,Y, Z axis. 

![](/files/-L_NhZqCoSGuo7oLfCYl)

This schema is on a NED (North East Down) repository as flight controllers. You need to place the module with the **X arrow to the top** of your autopilot, the **Y arrow to the right** (East) and **Z arrow down.**  

![](/files/-L_Ng-IbW5TcK3IR8rC1)

{% hint style="info" %}
Once the sensor is positioned in this way nothing prevents you from applying a rotation to the sensor in the "**Set Orientation**" section of the "**Sensor calibration**" menu of QgroundControl if you want to place it in another way .
{% endhint %}