CurlerRob

31 minutes ago, Coralc said:

Okay. Thanks. I just thought the yellow flag photo was interesting. ☺️

It is - I have several pics of it being flown as we entered ports on different cruises - an ancient rule. 🍺🥌

48 minutes ago, Coralc said:

Not exactly. "a yellow flag hoisted by all ships to request pratique on entering a harbor, or by a ship to show that it has contagious or infectious disease aboard, or by a ship that has been quarantined. called also yellow flag, yellow jack."

I believe you have posted a definition from the Merriam-Webster Medical dictionary, which is no longer correct. The use of the "Quebec" flag to indicate infection is obsolete now, although it was reactivated in a few ports during Covid.

This site has an interesting and fairly  comprehensive discussion  https://2015.maritimeprofessional.com/blogs/post/quarantine-flag-13441  🍺🥌

14 hours ago, Aplmac said:

Where is this?

Newcastle-upon-Tyne 🥌🍺