---
title: isRelativeAltitudeAvailable()
framework: coremotion
role: symbol
role_heading: Type Method
path: coremotion/cmaltimeter/isrelativealtitudeavailable()
---

# isRelativeAltitudeAvailable()

Returns a Boolean value indicating whether the current device supports generating data for relative altitude changes.

## Declaration

```swift
class func isRelativeAltitudeAvailable() -> Bool
```

## Return Value

Return Value true if the device supports relative altitude changes or false if it does not.

## Discussion

Discussion Use this method to determine if altitude updates are available before calling the startRelativeAltitudeUpdates(to:withHandler:) method.

## See Also

### Determining Altitude Availability

- [isAbsoluteAltitudeAvailable()](coremotion/cmaltimeter/isabsolutealtitudeavailable().md)
- [authorizationStatus()](coremotion/cmaltimeter/authorizationstatus().md)
- [CMAuthorizationStatus](coremotion/cmauthorizationstatus.md)