Or maybe because we might be able to tell the doubles from the originals without the masks
They have the capability to run them on autopilot:
10 Things to Consider While Using Auto-Pilot System on Ships
Back in the old days of merchant shipping, the âQuarter Masterâ was a vital member of the Bridge team. âQuarter Masterâ was the title given to the able bodied seamen whose primary responsibility was to steer the ship according to the Masterâs and Officerâs helm orders. Quarter Masters kept watches and took turns on the helm all day when at sea. This practise continued until automation took over in the field of navigation. The significance of Quarter Master almost vanished off when the revolutionary equipment âAuto-Pilotâ was invented. It was during the early 1920âs when an automated steering and helm control system was introduced onboard merchant ships.
Auto-Pilot system is considered as one of the most advanced and technically sophisticated navigational equipment tools on ships. Auto-Pilot is synchronised with the Gyro Compass to steer manually input courses, with reference to the gyro heading. Auto Pilot steers the manually input course by controlling the steering gear to turn the rudder in the required manner. Furthermore, modern auto-pilot systems are capable of being synchronised with the Electronic Chart system (ECDIS) enabling to follow the courses laid out in the Voyage plan. This feature cuts out the need of manual course changes and alterations as the system will follow the courses and alterations as per the voyage plan.
https://www.marineinsight.com/marine-navigation/10-things-to-consider-while-using-auto-pilot-system-on-ships/