Correct -- it is a completely untethered, mobile VR headset and for now has no positional tracking at all. The entire motivation for GearVR existing and Carmac

Correct -- it is a completely untethered, mobile VR headset and for now has no positional tracking at all. The entire motivation for GearVR existing and Carmack putting all his time into it is to accelerate the arrival of a standalone VR headset based on Android. Carmack seems to have transformed into a computer vision person the last few months in order to implement inside-out markerless tracking for future iterations. So view this as a parallel development track to the Oculus Rift, where the rift is focused on the best experience possible and the GearVR is focused on being an all-in-one device.