> For the complete documentation index, see [llms.txt](https://aerogcs-green-docs.aeromegh.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://aerogcs-green-docs.aeromegh.com/8.-rpa-settings/8.5-imu-calibration-settings/8.5.2-level-horizon-sensor-calibration.md).

# 8.5.2 Level Horizon Sensor Calibration

This sensor corrects minor orientation misalignments in the controller. For improved flight performance and drone efficiency, it's advisable to calibrate the level horizon before each flight in AeroGCS GREEN: 

1\.      Click the "**Calibrate**" button in front of Level Horizon. The following screen will be displayed on the user’s screen.

<figure><img src="/files/uxytBGuxNUwNS7D0V8Af" alt=""><figcaption><p>Level sensor calibration</p></figcaption></figure>

2\.      After Completing all level calibrations, simply click on “**Done**”.