4/26/2023 0 Comments Greta sans extended ttfAlthough the unit knot does not fit within the SI system, its retention for nautical and aviation use is important because the length of a nautical mile, upon which the knot is based, is closely related to the longitude/latitude geographic coordinate system. The difference from the modern definition is less than 0.02%. This method gives a value for the knot of 20.25 in/s, or 1.85166 km/h. The knot count would be reported and used in the sailing master's dead reckoning and navigation. Knots tied at a distance of 47 feet 3 inches from each other, passed through a sailor's fingers, while another sailor used a 30-second sand-glass (28-second sand-glass is the currently accepted timing) to time the operation. The chip log was cast over the stern of the moving vessel and the line allowed to pay out. This consisted of a wooden panel, attached by line to a reel, and weighted on one edge to float perpendicularly to the water surface and thus present substantial resistance to the water moving around it. Until the mid-19th century, vessel speed at sea was measured using a chip log.
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