) - unit of speed. Equal to speed uniform motion, in which a body travels a distance of one nautical mile in one hour. It is used in maritime and aviation practice, in meteorology, and is the basic unit of speed in navigation.
According to international definition, one knot is equal to 1852 m/h exactly or 0.51444... m/s. This unit of measurement, although non-systemic, is allowed for use along with units of the International System of Units (SI). In the Russian Federation, the unit is approved for use as an off-system unit without a time limit with the scope of application “marine navigation”. The unit is included in the All-Russian Classifier of Units of Measurement.
The prevalence of the knot as a unit of measurement is associated with the significant convenience of its use in navigation calculations: a ship moving at a speed of 1 knot along the meridian passes one arc minute of geographic latitude in one hour.
The origin of the name is related to the principle of using a manual sector log, which in its simplest form was a plank tied to a long thin cable (lagline) in such a way that when thrown overboard of a moving vessel, it would be braked by the water. Knots were tied on the laglin at equal distances from each other; the distance was selected such that the number of knots on the lagline being etched overboard, escaping from the lag view and passing through the measuring hand in a certain time, was numerically equal to the speed of the vessel, expressed in nautical miles per hour.
A knot is an independent unit of speed. To say: “The ship is moving at a speed of 36 knots per hour” is incorrect. The fallacy of such an expression is illustrated in the story “The Flying Dutchman” by L. S. Sobolev, an excerpt from which is given below:
Tell me, captain, what is our speed? - raising his glasses from notebook, the guest asked again.
Guzhevoy already opened his mouth to answer with his usual wit, that there were six knots per hour - in the first, and in the second they didn’t pull even three, but Piychik warned him:
How much is required: full speed, twelve knots.
- Leonid Sergeevich Sobolev. Stories of Captain 2nd Rank V. L. Kirdyaga, heard from him during the “Great Seat”
Node and nautical mile widely used in sea and air transport. The knot is the only widely used unit of speed that has its own name. Decimal prefixes (kilo-, milli-, etc.), which are used to form multiples and submultiples, are not used with the “knot” unit.
Knots and miles per hour should not be confused. A knot is one nautical (or nautical) mile (1852 meters) per hour, and "mile per hour" (English mph, miles per hour), widely used in Great Britain and North America, is a statute mile (1609 meters) in hour.
Before the introduction of the international knot, similar knot definitions were also used, based on different definitions of the nautical mile. In the USA, until 1952, a knot based on the American nautical mile (1852.249 m) was used. In Great Britain until 1970 (as well as in the countries of the British Commonwealth), a unit based on the British or Admiralty nautical mile (1852.184 m) was used. The difference between both definitions and the modern definition of a node is about 0.01% and is insignificant in almost all practical cases.
There is a simple mnemonic for quickly mentally converting knots to kilometers per hour: “multiply by two and subtract 10 percent.” For example, speed 15 knots, 15×2 = 30 km/h, subtract 10% = 3 km/h, we get 27 km/h. The rule gives values with an error of less than 3%. To recalculate km/h → nodes, the reverse algorithm is used: the speed in km/h is divided by 2 and 10% is added to the resulting value. For example, 20 km/h → 10 knots → 11 knots (exact value equals 10.8 knots).
Or adventures, in films about desperate sailors, in articles on geographical topic and the term “nautical mile” often slips into conversation between sailors. The time has come to figure out what length is equal to in shipping, and why sailors do not use the kilometers we are accustomed to.
What is 1 nautical mile?
Initially, this value corresponded to the length of 1/60 degree of the arc of a circle on the surface of the Earth with the center coinciding with the center of the planet. In other words, if we consider any meridian, then a nautical mile will be approximately equal to length one minute latitude. Since it differs somewhat from the outline of an ideal sphere, the length of 1 minute of a degree of the meridian in question may differ slightly depending on latitude. This distance is greatest at the poles - 1861.6 m, and least at the equator - 1842.9 m. To avoid confusion, it was proposed to unify the length of the nautical mile. The length taken as a basis was 1 minute of degree at 45º latitude (1852.2 m). This definition led to the fact that the nautical mile became convenient for calculating navigation problems. For example, if you need to measure a distance of 20 miles on a map, then it will be enough to measure 20 arc minutes with a compass on any meridian marked on the map.
Beginning in 1954, the United States began using the international nautical mile (1852 m). In practice, it is often rounded to 1800 meters. An official designation for this unit was never adopted. Sometimes the abbreviation "nmi", "nm" or "NM" is used. By the way, “nm” is the generally accepted designation for nanometer. 1/10 international nautical mile = 1 cable = 185.2 meters. And 3 miles are equal to 1 nautical league. In the past, the UK often used its own nautical mile, equal to 1853.184 m. In 1929, an international conference was held in Monaco on various issues of hydrography, at which the length of the nautical mile was determined to be 1852.00 meters. Do not forget that a mile can be not only sea, but also land. In this case, its length is 1.151 times less than sea length.
What is the relationship between a nautical mile and a knot?
The nautical mile, or, as it is sometimes called, geographical or navigational, has become widespread in geography, aviation and navigation. Closely related to it is the concept of a sea knot, used in shipping as the basic unit of speed. One knot is equal to one mile traveled per hour of the ship's movement. The name “knot” is due to the fact that in the old days a log was used on ships to measure speed. It was a log or board in the shape of a triangle to which a load was tied. A line (rope) was attached to this, on which knots were tied at a certain distance. The log was thrown overboard, after which, over a selected period of time (from 15 seconds to 1 minute), the number of knots that went into the water was counted.
Eat different versions relative to the distance between nodes. Some believe that it was 25 feet and if one knot left in 15 seconds, the result was one nautical mile (100 feet/min). According to the second version, the knots were tied in 47 feet and 3 inches (14.4018 m), and the countdown took 28 seconds. In this case, one knot showed a speed of 101.25 ft/min.
We hope that now you will not have difficulty understanding maritime terminology, and miles with knots will become as understandable as regular kilometers.
Knot (unit of measurement)
Aircraft speed indicator, graduated in knots.
The prevalence of the knot as a unit of measurement is associated with the significant convenience of its use in navigation calculations: a ship moving at a speed of 1 knot along the meridian, in one hour passes one corner minute geographical latitude.
The origin of the name is related to the principle of use sector lag. The speed of the vessel was determined as the number of knots on the line (thin cable) that passed through the hand of the measurer in a certain time (usually 15 seconds or 1 minute). In this case, the distance between adjacent nodes on the line and the measurement time were selected in such a way that this amount was numerically equal to the speed of the vessel, expressed in nautical miles per hour.
A knot is an independent unit of speed. To say: “The ship is sailing at a speed of 36 knots per hour” is incorrect. The absurdity of such an expression is very well described in the story “The Flying Dutchman”, an excerpt from which is given below.
“Tell me, captain, what is our speed? - Raising his glasses from his notebook, the guest asked again.
Guzhevoy already opened his mouth to answer with his usual wit, that there were six knots per hour - in the first, and in the second they didn’t pull even three, but Piychik warned him:
“As much as it should be: full speed, twelve knots.”
The lag cable, released while moving from the stern, broke into knots at a distance of 1/120 of a mile (50 feet). By counting the number of knots that travel in half a minute (1/120 of an hour), you can find out the speed in nautical miles per hour. It follows that the expression “30 knots per hour” is clearly meaningless: it turns out that the ship, instead of a decent speed of 56 km/h, drags 1500 feet (470 m) per hour, which is both incorrect and offensive.
The hub and international nautical mile are widely used in maritime and air transport. Knots were considered the most common measurement in England until 1965, but later they became known as miles.
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A knot is a unit of speed equal to one nautical mile per hour. Since there are different definitions of a nautical mile, accordingly, a node may have different meanings. By international definition, one knot is equal to 1.852 km/h (exactly) or... ... Wikipedia
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In the section on the question How many kilometers are in one sea node??? given by the author Hair the best answer is
The hub and international nautical mile are widely used in maritime and air transport. Knots were considered the most common measurement in England until 1965, but after a re-decision they became known as miles.
Answer from European[guru]
A knot is a unit of speed equal to one nautical mile per hour.
Since there are different definitions of a nautical mile, a knot can have different meanings.
By international definition, one knot is equal to 1.852 km/h (exact) or 0.5144444 m/s. This unit of measurement, although non-systemic, is allowed for use along with SI units.
The origin of the name is related to the principle of using sector lag. The speed of the vessel was determined as the number of knots on the line (thin cable) that passed through the hand of the measurer in a certain time (usually 15 seconds).
The hub and international nautical mile are widely used in maritime and air transport. Knots were considered the most common measurement in England until 1965, but after a re-decision they became known as miles.
Answer from electrostatics[newbie]
8 mph
Answer from Ytsuken tsuk[newbie]
1 m/knot = 1 m/mile (1.852 km/h). For example, a modern warship, a corvette, with a displacement of 800 tons develops a speed of ~ 30 m/knots, which is equal to ~ 55.5 km/h.
Source: Military-technical almanac "Typhoon" #46
Answer from User deleted[guru]
1.852 km/h= 1 knot
