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# session(_:didChange:)

Listen and react to geo-tracking state changes.

```
optional func session(_ session: ARSession, didChange geoTrackingStatus: ARGeoTrackingStatus)
```

## Parameters

`session`

The geo-tracking session.

`geoTrackingStatus`

The new status.

## Discussion

To create and maintain an effective geo-tracking session, an app must react promptly when ARKit changes the geo-tracking status. For more information, see [`ARGeoTrackingStatus`](/documentation/ARKit/ARGeoTrackingStatus).

ARKit invokes this callback only for [`ARGeoTrackingConfiguration`](/documentation/ARKit/ARGeoTrackingConfiguration) sessions.

---

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