Yes exactly repositioning cruises ! I confirm what you're saying. Sometimes you also get people who were visiting a continent going back home. For example Brasi

Yes exactly repositioning cruises ! I confirm what you're saying. Sometimes you also get people who were visiting a continent going back home. For example Brasilians going back home in December for their summer Modern ships built in the last 10 years have stabilizers. I've been in a big cruiseship without stabilizer before and it can indeed move a lot laterally up and down (in the directions orthogonal to the direction of the ship). So, for people afraid of that just research if the ship has stabilizers