Direct answer
Objectives follow journal display order. Some depend on your choices; follow the active objective in the game.
Result
While strolling along the banks of the Sansretour, Geralt came upon a riverboat. Within it, he found the remains of its captain. The old salt had not parted with his ship's log, even in death. His curiosity piqued, the witcher proceeded to look through the mariner's notes…
