I vaguely recall something of that myself. I put it farther back than ‘relatively recent’, though. Yet ‘Nearly ideally stable’ doesn’t necessarily lend itself to navigable. And the Bible doesn’t address navigation of the Ark. Simply that it ‘floated, and ‘came to rest’. I suspect Noah and the crew had much more to attend to, and they were at God’s will in any event.
Well, in a world that was covered in turbulent water, the notion of “destination” would be more than just abstract, so “navigable” would of necessity take a backseat to stability, wouldn’t you think?
God knew the outcome of the chaotic forces at work, and the Ark came to rest where it was intended. There was no more navigation involved than throwing a message in a bottle into the Atlantic on the Outer Banks of North Carolina and it ending up in County Cork, Ireland.