CHIPLOG
Chip log
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.The above text is a snippet from Wikipedia: Chip log
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chip log
Noun
- A simple device for measuring the speed of a vessel, consisting of a wooden board (drag) attached to a line on a reel.
The above text is a snippet from Wiktionary: chip log
and as such is available under the Creative Commons Attribution/Share-Alike License.