So a ship loses power, there’s no rudder control? No back up system?
At low speed boats with propeller/rudder have rather poor control when you lose propulsion. Anybody who has had to operate a Mastercraft ski boat will tell you getting docked or on a trailer takes small short bursts of power at low speed to keep control. Losing propulsion on something like that I would imagine makes changing direction slow. I think container ships have bow thrusters as well but are operated by electrical power.