That has been explained. The AIS tracks the boat’s heading from the main gyro compass. If this is turned off then displays assume that her heading is the same as her track which is computed from the, AIS incorporated, GNSS. So ‘Bayesian’ was probably head to wind while dragging her anchor, not doing that mad dance displayed on the AIS screens. The ‘Sir R.B-P’ had her compass running and it’s clear that she was riding pretty much head to wind. Mind you, the size of that mast might have made ‘Bayesian’ much more lively. The two vessels are so dissimilar that any comparison is pretty futile, and microbursts, like tornadoes, are so localised that total destruction can happen within 50 metres of places that are untouched.

That leads down to the galley/crew quarters. What the photos don’t show are the two large doors leading directly into the main saloon, both well away from the centreline and either, in my estimation - I’ve sailed yachts for over 60 years - would almost certainly be below the waterline if the yacht was laid flat on her side. It wouldn’t occur to even the most prudent seaman that these should be secured, while at anchor off a weather shore. In fact, it would hinder quick evacuation in the event of a far more likely danger: fire. There’s a thing called stress of weather and I think that this vessel met conditions that treated a 473 ton ship like a 5 ton yacht. But a 5 ton yacht is sealed up like a bottle and can spring back upright in seconds, while the 473 ton ship, with its vast indoor/outdoor well-deck leading directly to a stairway down to the accommodations, can’t. Once over beyond 73° she will lie on her side and simply fill. And, since that stairway comes up to starboard of the c/l, it would probably have been even quicker than if she’d gone over to Port. Poring over her deck plans and photos I think she would have filled and sunk in a very short time, perhaps as short as a minute or two.

@@q.e.d.9112 how about this 50T retractable keel? Does it not affect the center of Gravity 🤣

@@BTCxyz369 Yes it does. When it’s down she can (theoretically) recover from an 87° angle. If it’s up, she’ll capsize once she reaches 73°. However, the builder’s ship management documents state it should be up when at anchor. The noise problem is common to pretty much every centreboard yacht. TBH, nobody thought this big powerful vessel could be capsized by the wind, when at anchor. In strong winds yachts at anchor invariably lie head to wind. It would take a rapid shift in wind direction coupled with hurricane force to cause her to lay over at 73°. If the wind shifts direction by 90° over a period of minutes the yacht simply swings on her cable to continue facing the wind but if it happens in seconds, then she could be caught on her beam. Those angles of “no-return” are theoretical and I’d bet good money they assume a dry ship. Any flooding will rapidly reduce them. Since she starts down flooding at 45° and, once her rail goes under, it will be rapid flooding into her main deck area, she may have reached her point of no return earlier than that theoretical 73°.