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Commercial ships and naval vessels often keep a "rough log", – or "scrap log" – a preliminary draft of the ship's course, speed, location, and other data, which is then transcribed as the "smooth log", – or "official log" – the final version of the ship's record. Changes may be made to the rough log
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is typically used for record-keeping for complex machines such as nuclear plants or particle accelerators. In military terms, a logbook is a series of official and legally binding documents. Each document (usually arranged by date) is marked with the time of an event or action of significance.
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but the smooth log is considered permanent and no erasures are permitted. Alterations or corrections in an official logbook must be initialled by the authorised keeper of the logbook and the original data entries which have been cancelled or corrected must remain legible.
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that was used to estimate a ship's speed through the water. Today's ship's log has grown to contain many other types of information, and is a record of operational data relating to a
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fail. Examination of the detail in a ship's log is often an important part of the investigative process for official maritime inquiries, in much the same way as a "
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Most national shipping authorities and admiralties specify that logbooks are kept to provide a record of events, and to help crews navigate should
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