Watching some mariners on youtube [1] and they take a pretty dim view on the idea of ghost ships, except in certain short haul scenarios. They cite that almost all of the maintenance takes place continuously while the ship is underway. While automation may reduce the bridge crew, until there are cheap robots that can perform all maintenance tasks - from overhauling engines, maintaining equipment, painting everything…
> While automation may reduce the bridge crew, The guys who get paid the most, are also the easiest to replace with computers? Robot ships crewed with human sailors sounds a bit dystopian.
The Navigator used to be a position, and sometimes still nominally is, but it's now an officer position for management reasons and not because of a high degree of specialized skill.