# Level horizon calibration failed on voxl2

Source: https://forum.modalai.com/topic/1424/level-horizon-calibration-failed-on-voxl2
Category: VOXL 2 and VOXL 2 Mini (https://forum.modalai.com/category/26/voxl-2-and-voxl-2-mini)
Tags: voxl-2
Posted: 2022-10-05 05:27:28 UTC by Tamas Pal 0
Replies: 3 · Views: 508

## Tamas Pal 0 · 2022-10-05 05:27:28 UTC

I am having this error while doing level horizon calibration with voxl2 with QGC.
```
[cal] calibration started: 2 level
attitude estimator not running - check system boot ... 
[cal] calibration failed: level
```
I am using voxl-px4_1.4.28-202209292009 package. How to fix this ?

## Reply by Tamas Pal 0 · 2022-10-06 11:27:44 UTC

@modaltb any suggestion?

## Reply by modaltb (ModalAI staff) · 2022-10-06 16:06:13 UTC

Do you have a magnetometer connected?  If not try this:

![0fad686d-bb6e-4489-af0f-cc539b7b82d7-image.png](https://forum.modalai.com/assets/uploads/files/1665072306123-0fad686d-bb6e-4489-af0f-cc539b7b82d7-image.png) 

On my setup, I removed my compass, and if I didn't set this to `none` then I get the same error, but after setting to `none` I'm OK:

```
[cal] calibration started: 2 level
[cal] calibration done: level
```

## Reply by Tamas Pal 0 · 2022-10-12 14:47:43 UTC (in reply to modaltb)

@modaltb Thank you. It works....