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The **`speed`** read-only property of the {{domxref("GeolocationCoordinates")}} interface is a `double` representing the velocity of the device in meters per second. This value is `null` if the implementation is not able to measure it.
## Value
A `double` representing the velocity of the device in meters per second.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [Using the Geolocation API](/en-US/docs/Web/API/Geolocation_API/Using_the_Geolocation_API)