Great question! I was actually considering giving a very similar example! Every cell in our body is eventually replaced, so are we the same person? I believe Bernardo Kastrup’s analytical idealism will be most consistent with Swarm Theory. Basically this holds that the perceived barriers between things (e.g. the boat, the body) are “dissociative boundaries” within a unified “mind at large.” In Swarm Theoretical terms, boats and bodies are both swarms of information processing nodes. Creating information processing nodes which aggregate into swarms which themselves become information processing nodes, and so on, is how the universe scales consciousness and better understands itself. But Swarm Theory is still a work and progress, so working this all out in public and integrating the relevant science is part of what this journey is all about! So feel free to share your thoughts, feedback, and anything you think might be relevant.