Again, I was not saying that Nicholas and his family ever lived aboard a ship at sea. I was only mentioning a novel which was published around the time of the American Civil War and had nothing at all to do with Nicholas and his family.
It was called Man Without A Country.
That's it. No presumption that Nicholas and his family did the same, just mentioning a real life novel. I do believe for a while that the novel was thought to be a true story, but it was only a novel. But it had nothing to do with the Russian Imperial Family.