Now that Ishmael has properly begun his fateful voyage, this book will freely shift between narrative and non-narrative sections with no transition necessary. Ishmael doesn’t need an excuse to go off on a tangent at sea, there’s plenty of free time to sit around and think his thoughts.
This is the first chapter where we’re not following the narrative at all. This isn’t inspired by something in the last chapter. It’s not an anecdote connected to some incident that we get a glimpse of. It is purely Old Ishmael rambling about something. The narrative chain has been broken. The next time we pick it up, it may be hours after the Pequod left port, or months. We have no way of knowing.