# 8.4.2. Large Vehicle Calibration:

In AeroGCS GREEN, the user can calibrate large vehicles by tapping the "Calibrate" button in front of the large vehicle calibration. After clicking "**Calibrate**," the following screen will appear.

<figure><img src="https://3726973265-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEJHDgY5EjEXnZCA7cAxk%2Fuploads%2FezP4pKSDMPZiWuBTF0sK%2Fimage.png?alt=media&#x26;token=107ce92a-2ba2-4c08-9976-4cabe401f258" alt=""><figcaption><p>Large vehicle calibration</p></figcaption></figure>

on this screen user enters the value for magnetic declination to set and clicks on the “**Set**” button. This will set the value and will display the screen saying calibration complete please reboot the device as shown in the following screen.&#x20;

<figure><img src="https://3726973265-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEJHDgY5EjEXnZCA7cAxk%2Fuploads%2FQ6ZL9E8CCalPHN9JhCY9%2Fimage.png?alt=media&#x26;token=1d8ba330-77a9-43cb-bb5b-7c4f82ee966e" alt=""><figcaption><p>Large vehicle calibration complete</p></figcaption></figure>

This completes the Compass calibration process.