High Quality Content by WIKIPEDIA articles! A logbook was originally a book for recording readings from the log, and is used to determine the distance a ship traveled within a certain amount of time. The readings of the log have been recorded in equal times to give the distance traveled with respect to a given start position. Today's ship's log has grown to contain many other types of information, and is a record of operational data relating to a ship or submarine, such as weather conditions, times of routine events and significant incidents, crew complement or what ports were docked at and when. It is essential to traditional navigation, and must be filled in at least daily. Most National shipping authorities and Admiralties specify that logbooks are kept to provide a record of events, and to help crews navigate should radio, radar or the GPS 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 "black box" is used on airplanes see Mary Celeste. Logbook entries are sometimes of great importance in legal cases involving maritime commercial disputes.

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