一個航海器材行的徒弟，靠著自己的努力及毅力成為一個自學成功的航海學家及數學家。一生經過許多困難，但他以憑著白楊微風就可以駛船的體會，努力不懈，終能成功。
After finding a way to teach the ship’s crew members to understand navigation, Nat, a self-taught mathematician and astronomer in eighteenth-century Salem, Massachusetts, writes down his explanations and compiles them into ’The American Practical Navigator,’ also known as the ’Sailors’ Bible.’A fictionalized look at Nathaniel Bowditch and how his knowledge of mathematics, astronomy, ships, and the sea led him to become a brilliant navigator.