You can use this methods to inject a 'fake' GPS position. This can become necessary when your ARchitect World should use a fixed reference point to start from e.g. a game at a specific monument or place. But in general you don't have to use this method if you don't have to.
After you've injected a new location the 'onLocationChanged' callback will be triggered and all your currently existing drawables will be redrawn, reflecting the new location.