The ‘Baynesian’ anchored off Porticello at around 20::00 UTC the evening before the disaster.
Another sail yacht, ‘Sir Robert Baden Powell‘, an old classic one (1958, two masts, about 40 meters) was at anchor nearby to NW. Two men from this yacht came over in a small craft, when the ‘Baynesian’ disappeared, to save the swimming people.
The wind, after midnight until the disaster, was WNW 10/15 knots at large, at the protected anchorage 2/3 knots. However, there was this singular villain waterspout inside, probably invisible during the night.
The water temperature was about 30°C, the air temp at about 26°C (maybe this influences the strength of the waterspout).
I have seen many waterspouts, but never what they could do on boats or ships.
The Baynesian’s course to the anchorage and after the anchor could not hold her anymore.
The Good Samaritan (as ‘Sir Robert B P’) is anchored just to NW… and stayed there.
After drifting away:
The first direction arrow is at 01:59 UTC, speed 1.3kn
The second arrow is at 02:03, speed 2.6kn
The last AIS signal is at 02:05, speed 2.6kn