A book for recording events during a voyage or flight, or any systematic record of activities, progress, or events.
Originally from nautical 'log' (a device for measuring ship's speed) plus 'book'. The ship's log was literally a log of wood attached to a rope to measure speed, and the logbook recorded these measurements plus other voyage details.
The maritime tradition of keeping detailed logbooks became crucial for navigation and later for legal purposes - many historical discoveries and shipwreck investigations rely on logbook entries. Modern aviation logbooks are legally required and can determine a pilot's qualifications, career progression, and even serve as evidence in accident investigations.
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