Captain Jack Aubrey is one of two main characters in the Aubrey-Maturin series of books, as well as the 2003 movie, Master and Commander: The Far Side of the World. The books are about the shenanigans he gets into with the other main character, Stephen Maturin (a spy-revolutionary-Catholic-doctor-shipsurgeon-assassin-translator-naturalist-woobie) as they sail around the world. There's also something about the Napoleonic Wars in there and Jack being an officer, but I'm not entirely sure, I'll have to double-check.