---
title: unknown
framework: coremotion
role: symbol
role_heading: Instance Property
path: coremotion/cmmotionactivity/unknown
---

# unknown

A Boolean indicating whether the type of motion is unknown.

## Declaration

```swift
var unknown: Bool { get }
```

## Discussion

Discussion This property is set to true when there is no way to estimate the current type of motion. For example, this property might be true if the device was turned on recently and not enough motion data had been gathered to determine the type of motion.

## See Also

### Getting the Type of Motion

- [stationary](coremotion/cmmotionactivity/stationary.md)
- [walking](coremotion/cmmotionactivity/walking.md)
- [running](coremotion/cmmotionactivity/running.md)
- [automotive](coremotion/cmmotionactivity/automotive.md)
- [cycling](coremotion/cmmotionactivity/cycling.md)