If I drive onto the ferry am I part of the crew? I’ve been told (trained) on what to do and I’m equipped (my car), so am I a crew member? No, I’m just a passenger following the crew’s direction.
If the ferry is fully automated and I don't do anything beyond parking my car safely I wouldn't say I was crew then, I'm still just a passenger until I actually do something for the operation of the vehicle/craft.