---
title: relativeAltitude
framework: coremotion
role: symbol
role_heading: Instance Property
path: coremotion/cmaltitudedata/relativealtitude
---

# relativeAltitude

The change in altitude (in meters) since the first reported event.

## Declaration

```swift
var relativeAltitude: NSNumber { get }
```

## Discussion

Discussion For the first altitude event delivered to your altimeter object, the value of this property is 0. Subsequent events contain a number that reflects the relative change in altitude with respect to the first reported event. For example, if the altitude changed five meters between the first and second events, the value in this property is 5 for the second event.

## See Also

### Getting the Altitude Data

- [pressure](coremotion/cmaltitudedata/pressure.md)