Ships once they leave port cruse by computer and digital charts to the next port already.
Yup. But a crewed vessel can go manual to assist other distressed vessels....and improvise solutions as needed to complete a voyage. It is reckless to de-crew. And it’ll be costly when, like, the brakes fail. Software glitch. $$$$$$$$$$$$$$$$
So, no one makes any decisions today aboard those ships, they just sit there, enjoy the view and drink coffee?