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
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