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# speed

The instantaneous speed of the device, measured in meters per second.

```
var speed: CLLocationSpeed { get }
```

## Discussion

This value reflects the instantaneous speed of the device as it moves in the direction of its current heading. A negative value indicates an invalid speed. Because the actual speed can change many times between the delivery of location events, use this property for informational purposes only.

### Special Considerations

In iOS, this property is declared as `nonatomic`. In macOS, it is declared as `atomic`.

---

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