Setting Apple Watch when crossing the Atlantic on a cruise ship
Crossing the Atlantic in a few days. Since we lose an hour every day (EDT +1, +2, +3 etc) how do I set my Apple watch to correspond to the correct time?
Apple Watch Series 5
Apple has some instructions in the support document If you can't change the time or time zone on your iPhone, iPad or iPod touch.
Your watch is dependent on your iPhone and should adjust its time accordingly.
The automatic change requires internet connection, which may or may not be available on the vessel. Ask the crew about that.