A chip log, also called common log, ship log or just log, is a navigation tool used by mariners to estimate the speed of a vessel through water. The name of the unit knot, for nautical mile per hour, was derived from this method of measurement. == History == All nautical instruments designed to measure the speed of a ship through water are known a...
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http://en.wikipedia.org/wiki/Chip_log
a log for measuring the speed of a vessel. Also called
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https://www.infoplease.com/dictionary/chip-log
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