I just sailed from the BVI to St. Lucia, staying pretty far offshore all the time. There was never once when I looked astern and did not see any Sargasso. Most of the patches were less than 50 square feet, but some of them were up to 100 feet wide. And this was 3 days at sea with nothing better to do than look out behind me. That is an awful lot of sargassum! Even the big squalls did little to break up the clumps, and I'm sure that they coagulated together again just like the V2 Terminator!