Like the rest of the app, do not trust the Daily Planner. There are often discrepencies between the app and the real schedule - we've been burned by expecting the app to be correct, only to show up for an event that didn't exist while missing the correct time. I think the app is set up ahead of time and never updated when changes are made during the sailing.
We did Celebrity's first transatlantic after restarting (Apex, Oct/Nov 2021). Ship was at 1/3 capacity, We were tested before sailing, midway through, and before departing. We felt like the safest place on the planet for those two weeks.
For reference, this site has a list of countries whose citizens are exempt from the eVisa requirement: https://visaguide.world/asia/vietnam-visa/do-i-need-a-visa-for-vietnam/
Depends on which OS you were using. MTS (the Michigan Terminal System) had an actual compiler for SNOBOL, and used WATBOL (Waterloo's implementation) as the interpreted version.
In college, we used to pull cards out of the trash and run them through the SNOBOL compiler. The great thing is that there's pretty much no such thing as a syntax error in SNOBOL, so the results were always interesting.