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# startDeviceMotionUpdates(using:)

Starts device-motion updates using a reference frame but without a block handler.

```
func startDeviceMotionUpdates(using referenceFrame: CMAttitudeReferenceFrame)
```

## Parameters

`referenceFrame`

A constant identifying the reference frame to use for device-motion updates. It’s your responsibility to specify a reference frame that’s available on the current device. Call [`availableAttitudeReferenceFrames()`](/documentation/CoreMotion/CMMotionManager/availableAttitudeReferenceFrames()) to determine which reference frames are currently available.

## Discussion

You can get the latest device-motion data through the [`deviceMotion`](/documentation/CoreMotion/CMMotionManager/deviceMotion) property. You must call [`stopDeviceMotionUpdates()`](/documentation/CoreMotion/CMMotionManager/stopDeviceMotionUpdates()) when you no longer want your app to process device-motion updates.

---

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