The built-in, offline mapping in my Honda uses a whole host of local-only sensors to handle these situations where GPS is intermittent. It works rather well at figuring out where the car is on the map, and when it deviates from the prescribed route.

It works in tunnels. It works in cities with tall buildings. It works on Lower Wacker Drive in Chicago.

Is there some technological limitation that precludes using this data to determine whether or not a movie can be played?

(It's not like it's new tech. It's decades-old. Honda started using it over 20 years ago.)