My bad. I am not familiar with USA skiing; I spend my northern winters in St Anton (well, I did before covid screwed the pooch).
In Austria, off-piste starts from outside the piste edge markers, even if you are just metres away. I will leave an explanation of the rather ambiguous “routes”, or “itineraries” (as the Brit call them) for another time.
You are on your own in the off-piste: nothing is marked and there is no avi control, unless it is required to secure a piste below. There are almost never any ropes or gates to highlight that you are leaving a ski area boundary: the concept does not really exist. You will however occasionally see signs that warn you that you are leaving a secured area on the edge of pistes at points used regularly for exit into the off-piste/backcountr.
Rescue requires an expensive heli ride, assuming you are able to contact SAR - some valleys have no phone reception. You are expected to know what you are doing, be suitably equipped, and accepting of the risks/consequences.