# 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="/files/rvbrbP16q1bB1YB4eHTZ" 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="/files/RmgiDnS9pGtL1EQ0jBwa" alt=""><figcaption><p>Large vehicle calibration complete</p></figcaption></figure>

This completes the Compass calibration process.


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