High Quality Content by WIKIPEDIA articles! 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. A chip log consists of a wooden board attached to a line the log-line. The log-line has a number of knots tied in it at uniform spacings. The log-line is wound on a reel to allow it to be paid out easily in use. Over time, the log was standardized in construction. The shape is a quarter circle, or quadrant and the log-line is attached to the board with a bridle of three lines connected to the vertex and to the two ends of the quadrant's arc. In order to ensure that the log submerges and is oriented correctly, the bottom of the log is weighted with lead. This provides for more resistance in the water and a more accurate and repeatable reading of speed. The bridle is attached in such a way that a strong tug on the log-line results in one or two of the bridle's lines releasing, allowing the log to be retrieved with relative ease.

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