Chip log
![Diagram of a chip log](/Images/godic/202502/14/Archaic_ship_log.svg2901.png")
![Ship log and associated kit. The reel of log-line is clearly visible. The first knot, marking the first nautical mile is visible on the reel just below the centre. The timing sandglass is in the upper left and the chip log is in the lower left. The small light-coloured wooden pin and plug form a release mechanism for two lines of the bridle. From the Musée de la Marine, Paris.](/Images/godic/202502/14/Loch_à_plateau2901.jpg")
![A patent or taffrail log](/Images/godic/202502/14/Negus_ship_log2901.jpg")
A chip log, also called common log, ship log, or just log, is a navigation tool mariners use to estimate the speed of a vessel through water. The word knot, to mean nautical mile per hour, derives from this measurement method.
Taffrail log
英语百科
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