Dutton's Nautical Navigation Pdf Free 46 ((BETTER))
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A nautical chronometer is an electronic device or instrument which usually contains a navigational calculator and a sundial. It measures the local time in one latitude. Together with a nautical almanac it is essential to determine longitude, latitude and the course to latitude. The instrument is synchronized by a mechanical or magnetic time comparison. Historically, chronometers and their calculator were hand operated. In the 20th century, compact electronic display chronometers were developed. The nautical almanac was replaced by a watch with marine chronometer by the early 20th century. The marine chronometer is not only used for celestial navigation but also for determining the position in the oceans. A nautical how ( nautical horology ) is a navigational device that provides analog and digital solutions for nautical navigation and is meant to supplement the use of traditional navigational tools like a nautical almanac or a sextant.
One must know specifically the portion of the oceans to be traversed in order to be able to plot a correct course. By navigation in this sense, one means sailing in any given waters, whether inland or in an ocean. For convenience, this work generally speaking, divides the earth's surface into three parts: land, inland waters, and the oceans; with navigation designating the practice of traveling in the waters over which sovereignty is exercised; it is defined as the means of passing from one place to another. The term properly denotes the art of passing over as far as possible by avoiding rocks, shoals, and reefs and enjoying the wind and tide, to the harbor you want to enter; hence, to pass over successfully. He who can do this, without any assistance of the knowledge of shoals, or their direction, is said to come to an anchor, be at anchor. The breadth of water in any locality that may have a bearing on navigation is ascertained by actual measurement, something which may be done by sinking a lead. The rule of thumb given by most English writers for the proportion of wide to narrow water is, that for every 1 fathm or 3 roods, there is 1 fathm or 6 feet. d2c66b5586