@criss
What do you mean with “current possibilities”.
Some satellite view and forecast seem to be existing, not not sure it is available as free data.
https://marine.copernicus.eu/services/use-cases/real-time-satellite-detection-and-drift-forecast-sargassum-algae-equatorial
https://datastore.cls.fr/products/samtool-sargassum-detection/#DailyImages