Log

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"Log." 30 August 2007. HowStuffWorks.com. <http://reference.howstuffworks.com/log-encyclopedia.htm> 24 July 2008.

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Log is an instrument that measures the speed of a ship. Logs used by modern ships include (1) a tachometer; (2) the Doppler sonar speed log; (3) the pitot-static log; and (4) electronic navigation devices.

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