A ship’s journal. It contains a minute account of the ship’s course, with a short history of every occurrence during the voyage. 1 Marsh. Ins. 312. The part of the log book relating to transactions in the harbor is termed the “harbor log;” that relating to what happens at sea, the “sea log.” Young, Naut Diet Official log book. A log book in a certain form, and containing certain specified entries required by 17 & 18 Vict. c. 104,