Twilight smoke showing which way the wind is blowing on the QM2 and one of the radomes – https://emmacruises.com/what-are-the-big-white-balls-on-top-of-cruise-ships/

Twilight. The chimney stack of the QM2 is central, there is sport equipment in front of it. Smoke comes out of the chimney, showing which way the wind is blowing. One of the white round radomes is to the left.