The Patrick O'Brian Mapping Project
The Aubrey–Maturin series is a sequence of historical novels by Patrick O'Brian, set during the Napoleonic Wars. The novels tell the adventures of Captain Jack Aubrey of the Royal Navy and his ship's surgeon Stephen Maturin. You might be more aware of the characters from the movie Master and Commander, starring Russell Crowe, which was adapted from three of the novels.
The Patrick O'Brian Mapping Project's aim is to accurately map the progress of Jack Aubrey and Stephen Maturin over the course of the 21 novels. Currently 36% of the novels have been mapped.