Calibration Script

So I have a script to rotate the camera based upon deviations in gyroscopic values. However, for the sake of convenience, I also want to write a script recallibrate(?) the script such that when a button is pressed, a certain condition is satisfied, the iphone's current rotation is essentially the new (0,0,0). Unfortunately I can't literally just go (transform.rotation = Quaternion.Euler(0,0,0)). The best idea i have right now is to create an empty GameObject of (0,0,0) rotation and have the camera rotate relative to that object. Is there any way that's more efficient or just plain simpler?