I saw for the mod Bug for its hints about this, I guess it's included in Bug. But what exactly qualifies as circumnavigating the world? Does it have to be the same unit? Like if one unit went one way and another the other way till it was full circle, would that do it? Is it about explored area or literal movement of ship? Does north and south movement have any effect for qualifying or disqualifying?

Also does the AI know to use it? If you're battling an AI that can't take advantage since it doesn't known how to, it might be a bit too powerful since you will always beat the AI to it since AI isn't even trying.

I wanted to ask in comments or message the creator but I can't seem to do either.