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# DockAccessory.MotionState

An event that indicates the state of a dock accessory’s current position and speed.

```
struct MotionState
```

## Overview

This event indicates the dock accessory’s current velocity
and position along each supported axis of rotation. For more information, see [`motionStates`](/documentation/DockKit/DockAccessory/motionStates-swift.property).

## Topics

### Getting properties

[`angularPositions`](/documentation/DockKit/DockAccessory/MotionState/angularPositions)

The angles of the axes, in radians.

[`angularVelocities`](/documentation/DockKit/DockAccessory/MotionState/angularVelocities)

The angular velocity of each axis of rotation in radians.

[`timestamp`](/documentation/DockKit/DockAccessory/MotionState/timestamp)

The current time, in UNIX epoch.

[`error`](/documentation/DockKit/DockAccessory/MotionState/error)

The error, if any.


---

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