http://brainafk.com/29159264

gistfile1.cs

public static class GeoPositionWatcherExtensions
{
	public static IObservable<IEvent<GeoPositionStatusChangedEventArgs>> GetStatusChangedEventObservable<T>(this IGeoPositionWatcher<T> watcher)
	{
		return Observable.FromEvent<GeoPositionStatusChangedEventArgs>(ev => watcher.StatusChanged += ev, ev => watcher.StatusChanged -= ev);
	}

	public static IObservable<IEvent<GeoPositionChangedEventArgs<T>>> GetPositionChangedEventObservable<T>(this IGeoPositionWatcher<T> watcher)
	{
		return Observable.FromEvent<GeoPositionChangedEventArgs<T>>(ev => watcher.PositionChanged += ev, ev => watcher.PositionChanged -= ev);
	}
}