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All nautical instruments designed to measure the speed of a ship through water are known as logs. [1] This nomenclature dates back to days of sail when sailors tossed a log attached to rope knotted at regular intervals off the stern of a ship. The sailors would count the number of knots that passed through their hands in a given period of time.
With the introduction of the nautical mile as a standard unit of measure at sea in the 15th century, they began to mark the line at equal intervals proportional to the nautical mile and to the time interval used for measurement. Initially, the markings were simply knots in the line. Later, sailors worked knotted cords into the log-line.
The traverse board is a wooden board with peg-holes and attached pegs. It is divided into two parts, upper and lower. The top part is for recording direction sailed. It has a representation of the compass rose with its 32 compass points, just as on the face of the ship's compass. Eight concentric rings are inscribed on the compass rose.
It consists of a small board with a knotted piece of twine through the center. The observer holds one of the knots in his mouth and extends the board away so that the edges make a constant angle with his eyes. Mariner's astrolabe Derived from the astrolabe, it was developed in late 15th century and found use in the 16th to 17th centuries.
Such as, a vessel has a speed of 8 knots through the water and the vessel is traveling with the current, which is at 2 knots, then the speed over ground is 8+2 and the vessel's true speed is 10 knots. Set and Drift can be calculated by using a vector diagram and can be drawn and measured on a chart, maneuvering board or even a plain piece of paper.
A decorative or ornamental knot (also fancy knot [1]) is an often complex knot exhibiting repeating patterns. A decorative knot is generally a knot that not only has practical use but is also known for its aesthetic or ornamental qualities. [ 2 ]
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A cleat hitch is a knot used to secure a rope to a cleat. A line tied with a cleat hitch to a horn cleat [ 1 ] on a dock. The line comes from a boat off the top of the picture, around the right horn, around the left horn, across the cleat from top left to bottom right, around the right horn, and then hitches around the left horn.
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