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 other types of information, and is a record of data relating to a
ship or
submarine, such as weather conditions,
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 Admiralties specify that logs are kept to provide a record of events, and to help crews navigate should
radio,
radar or the
GPS fail. Examination of a log is often used to try to explain some sort of disaster, in much the same way as a "
black box" is used on
airplanes (see
Mary Celeste).
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