Something is stuck at the buoy! but it`s NOT...
A, a submarine radio antenna, because they could see two words on the buoy that said Kristina and Karingon = a popular name for swedish boats and the other word is a famous fishing community near by.
B, The buoy is NOT being dragged by a boat, there is no boat wake anywhere, unless they used a very long cable UNDER the water!
It could be...
1, mirage = the buoy only looks like it`s moving.
2, a big fish stuck to it.
3, a submarine stuck to it.
They called the coast guard, they came and looked but found nothing