[QUOTE=Topsail;62281]I can assure you that making such a sharp turn on a dead ship is impossible without an anchor holding fast on the bottom (21:09:35).[/QUOTE]
I would tend to disagree with this assessment. Looking at the spacing of the last 4 plots, the CC has ‘about’ the same speed upwind as in the downwind 4 plots. She was at the end of momentum, and reached dead ship/ no way status, then simply turned and answered to the wind and drifted ashore. This is shown by the 90degree heading change. After she started the SW drift the heading change never wavered until she fetched up on shore. Even the relative speed of advance remained pretty similar throughout drift too. As CC is slewing from original heading (or a lazy right turn) once she heads up to wind the speed plot shows no change in velocity until she stopped, then she turned. Why did she turn to STBD? Boats sometimes answer strangely. But she did take off to STBD. I would bet they will find the remaining rudder (Or the rudder stocks) still hard to starboard! That would explain the slowly decreasing turn to STBD, until she lost all way, and had NO flow over the rudder.