Support for navigator.geolocation change event

It would be awesome to be able to attach a listener to a change in geolocation.

I haven't been able to find anything commenting on this either on w3 or searching elsewhere. Seems that it开发者_运维百科s obviously not provided at the moment, but is there any planned support for this from any browser or any w3 spec?

"This method returns a watch ID value then can be used to unregister the handler by passing it to the Geolocation.clearWatch() method." https://developer.mozilla.org/en-US/docs/Web/API/Geolocation.watchPosition

id = navigator.geolocation.watchPosition(success, error, options)

http://dev.w3.org/geo/api/spec-source.html