a log for measuring the speed of a vessel.
Origin of chip log
First recorded in 1825–35
Also called hand log.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for chip log
nautical a log for determining a vessel's speed, consisting of a wooden chip tossed overboard at the end of a line that is marked off in lengths of 47 feet 3 inches; the speed is calculated by counting the number of such intervals that pass overboard in a 28-second interval
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012