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# WorldTrackingProvider

A source of live data about the device pose and anchors in a person’s surroundings.

```
final class WorldTrackingProvider
```

## Topics

### Tracking objects

[`init()`](/documentation/ARKit/WorldTrackingProvider/init())

Creates a world-tracking provider.

[`anchorUpdates`](/documentation/ARKit/WorldTrackingProvider/anchorUpdates)

A sequence of updates to anchors a provider tracks.

[`requiredAuthorizations`](/documentation/ARKit/WorldTrackingProvider/requiredAuthorizations)

The types of authorizations necessary for tracking world anchors.

[`isSupported`](/documentation/ARKit/WorldTrackingProvider/isSupported)

A Boolean value that indicates whether the current runtime environment supports world-tracking providers.

[`allAnchors`](/documentation/ARKit/WorldTrackingProvider/allAnchors)

An array of all known world anchors from the world-tracking provider.

[`addAnchor(_:)`](/documentation/ARKit/WorldTrackingProvider/addAnchor(_:))

Adds a world anchor you supply to the set of currently tracked anchors.

[`WorldTrackingProvider.Error`](/documentation/ARKit/WorldTrackingProvider/Error)

An error that can occur during a world-tracking session.

### Stopping object tracking

[`removeAnchor(_:)`](/documentation/ARKit/WorldTrackingProvider/removeAnchor(_:))

Removes a world anchor from a world-tracking provider.

[`removeAnchor(forID:)`](/documentation/ARKit/WorldTrackingProvider/removeAnchor(forID:))

Removes a world anchor from a world-tracking provider based on its ID.

### Predicting device pose

[`queryDeviceAnchor(atTimestamp:)`](/documentation/ARKit/WorldTrackingProvider/queryDeviceAnchor(atTimestamp:))

The predicted pose of the current device at a given time.

### Inspecting a world-tracking provider

[`state`](/documentation/ARKit/WorldTrackingProvider/state)

The current status of data coming from a provider.

[`description`](/documentation/ARKit/WorldTrackingProvider/description)

A textual description of a world-tracking provider.


---

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