A measure of the length of a sea knot. How did it appear and what is one nautical mile equal to?

In order to find out how many meters there are in a nautical mile, you need to use a simple online calculator. Enter in the left field the number of nautical miles you want to convert. In the field on the right you will see the result of the calculation. If you need to convert nautical miles or meters to other units of measurement, simply click on the appropriate link.

The nautical mile is a non-systemic unit of measurement; its use is not recommended, but is allowed. Distances at sea are measured in nautical miles. One nautical mile is 1,852 meters, respectively, one kilometer is 0.5399568 nautical miles. This value was introduced in 1929 at the international hydrographic conference in Monaco without designation, in practice nautical mile abbreviated as M, NM, Nm, nmi.

Since the time of Mercator, the length of a nautical mile has been considered to be 1 minute of degree of meridian arc (1/21600 of the length of the meridian arc). Since earth's surface spherical, the value of 1 minute of degree of the meridian is different at the poles (1,861.6 m) and at the equator (1,842.9 m). The unified value is equal to the length of a minute of a meridian degree at latitude 45º (1,852.2 m). This unit of measurement is convenient for navigation, since it is both an angular and linear measure. Before 1955, the US nautical mile was 1,853.248 meters or 6,080.20 feet.

What is "meter"

Meter (m, m) is one of the seven basic units of the International System (SI), also included in the ISS, ICSA, ICSC, ICSG, MSK, ICSL, ISS, ICSS and MTS. A meter is the distance that light travels in a vacuum in 1/299,792,458 of a second. From the definition adopted in 1983 by the General Conference on Weights and Measures, it follows that the concept of “meter” is tied to the second by means of a universal constant (the speed of light).

In Europe for a long time there were no standard measures for determining length. An urgent need for unification arose in the 17th century. With the development of science, a search began for a measure based on a natural phenomenon and allowing calculations in the decimal system. Then the “Catholic meter” of the Italian scientist Tito Livio Burattini was adopted.

In 1960, the man-made standard was abandoned and until 1983 the meter was the number 1,650,763.73 multiplied by the wavelength of the orange line (6,056 Å) of the spectrum emitted by the krypton isotope 86Kr in a vacuum. This prototype is now out of use. Since the mid-70s of the last century, when it became possible to maximize precise definition speed of light, it was accepted existing concept meters, tied to the speed of light in a vacuum.

Nautical mile- a unit of distance used for navigation and aviation.

Since the Earth is actually a spherical shape, but a geoid (oblate at the poles), the one-minute meridian corresponds to approximately 1862 m and 1843 m to the equator (average about 1852 m).

According to modern definition, adopted in the 1929 International Monograph on Hydrophotography, international nautical mile exactly 1852 meters.

The nautical mile is not an SI unit, but its use is permitted as defined by the General Conference on Weights and Measures, although it is not recommended.

There is no generally accepted name; Sometimes the abbreviations "NM", "nm" or "nmi" (from English) are used. nautical mile). It should be noted that the abbreviation “nm” coincides with the officially accepted nanometer mark.

UK nautical miles before the transition to the international system (before 1970) = 1853,184 meters.

This is because we wanted to simplify the conversion from English miles to sea. One mile (5,280 feet) was added by 800 feet, and the English nautical mile (Admiralty Mile) was 6,080 feet.

United States nautical miles before moving to the international system (pre-1955) = 1853,248 meters or 6080.20 meters.

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Passage marking the nautical mile

When several Austrian soldiers passed, Rostov noticed that next part line (which was the security guard) had already come into play.
“So much better!”

I’ll look around, he thought.
He was driving almost along the front. Some riders rallied against him. These were our Ulans, who returned from the attack in disorganized ranks.

Rostov wore them, he involuntarily noticed one of them in his blood and bent down again.
"I don't care!" - he thought.

Before he could ride a few hundred steps after that, on the left side to intercept him, a huge mass of cavalry on a black horse appeared in the entire playing field, with a white shining uniform standing in front of him. Rostov put his horse into a full gallop to get out of the way of these cavalrymen, and he would have left them if they were walking anyway, but everyone added speed, so some horses jumped.

Rostov became more and more audible, and their bells and weapons became their sounds, and their horses, figures and even faces became more noticeable. It was our horsemen who attacked the French cavalry, which opposed them.
The riders have galloped, but they still have horses. Rostov already saw his cheeks and heard the order: “March, march!” The officer who pulled out the bloody horse in full swing said it.

Rostov, who was afraid of being crushed or entangled in an attack on the French, he moved along the front, which was the urine of his horse and had not yet crossed.
Rok Strazhar, a huge increase in the pockmarked man, angrily angered Rostov in front of him, which he urgently had to face. This guardsman almost hit Rostov with his Bedouin (Rostov, which I felt so small and weak compared to these big men and horses), if you did not think of swinging your whip in the eyes of his cavalry horse.

Crows, a heavy five-inch horse, are always right when giving ears; but the pockmarked Guardsman dragged her hips to swing his large paws and horses, waving his tail and speeding up his neck even more. As soon as the horse guards passed by Rostov, he heard them shout: “Hura!” And when I looked back, he saw that their first rank was mixed with other people, probably French cavalry with red elephants. There was nothing to be seen, as it had been immediately after the gun was fired, and everyone was dressed in smoke.

Nautical mile- a unit of distance used for navigation and aviation.

The nautical mile was originally defined as the length of a great circle on the surface of the world, which measures one minute of arc. This movement of one nautical mile along the meridian roughly corresponds to a change in geographic coordinates per minute of latitude.

Since the Earth is not actually spherical, but rather a geoid (flattened by the poles), one meridian minute corresponds to approximately 1842 m at the pole and 1843 m at the equator (an average of about 1852 m). According to the modern definition adopted in the 1929 International Monograph on Hydrophotography, international nautical mile(International nautical mile) exactly 1852 meters.

The nautical mile is not an SI unit, but its use is permitted as defined by the General Conference on Weights and Measures, although it is not recommended. There is no generally accepted name; the abbreviations "NM", "nm" or "nmi" (from English nautical mile) are sometimes used. It should be noted that the abbreviation “nm” coincides with the officially accepted nanometer mark.

International nautical mile = 10 cables = 1/3 nautical leagues

UK nautical miles before the transition to the international system (until 1970) were 6,080 feet = 1,853,184 meters.

This is because we wanted to simplify the conversion from English miles to sea. One mile (5,280 ft) was added 800 ft, while the English nautical mile (Admiralty mile) was 6,080 ft [ source not specified for 313 days]

United States nautical miles before moving to the international system (pre-1955) = 1853,248 meters or 6080.20 meters.

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In order to find out how many nautical miles are in a kilometer, you need to use a simple online calculator. Enter in the left field the number of kilometers you are interested in that you want to convert. In the field on the right you will see the result of the calculation. If you need to convert kilometers or nautical miles to other units of measurement, simply click on the appropriate link.

What is a "kilometer"

Kilometer (km, km) is a multiple of the meter standard unit for measuring distance, widely used throughout the world.

One kilometer is 1,000 meters, 0.621 miles, 0.9374 versts, 1,094 yards, 3,281 feet, 1.057 x 10 − 13 light years, 6.67 x 10 − 9 astronomical units.

What is a "nautical mile"

The nautical mile is a non-systemic unit of measurement; its use is not recommended, but is allowed.

Distances at sea are measured in nautical miles. One nautical mile is 1,852 meters, respectively, one kilometer is 0.5399568 nautical miles.

This value was introduced in 1929 at the international hydrographic conference in Monaco without a designation; in practice, the nautical mile is abbreviated as M, NM, Nm, nmi.

Since the time of Mercator, the length of a nautical mile has been considered to be 1 minute of degree of meridian arc (1/21600 of the length of the meridian arc).

Since the earth's surface is spherical, the value of 1 minute of degree of meridian is different at the poles (1,861.6 m) and at the equator (1,842.9 m).

The unified value is equal to the length of a minute of a meridian degree at latitude 45º (1,852.2 m). This unit of measurement is convenient for navigation, since it is both an angular and linear measure. Before 1955, the US nautical mile was 1,853.248 meters or 6,080.20 feet.

MILE SEA

(Nautical mile) - the length of 1\" of the meridian arc, considering the Earth to be a ball whose volume is equal to the volume of the earth's ellipsoid. Then the value of the nautical mile is determined from the equality:

n= 2π R/360·60 = R·arc 1\",

and according to the specified condition, where - semimajor axis of the earth's spheroid, b- minor axis.

If we take the values of these semi-axes according to the Clarke spheroid data, then n comes out to be 1853.3 m = 6080.4 ft. But in the USSR, all maps are built on the basis of Bessel spheroid data, therefore, by circular of the Hydrographic Administration No. 317 dated 8/VII 1931, the value of the nautical mile was set at 1852.0 m, which corresponds to the length of 1\" arc of the elliptical meridian at latitude 45°, i.e. the value:

(a + b)/2 arc1\"

according to Bessel spheroid data.

If we take 1" arc of the elliptical meridian as a unit for measuring distances, then the divisions of the vertical frames of the map will represent this scale. This value changes with the latitude of the place from 1842.7 m= 6045.7 feet at equator to 1861.3 m= 6106.7 feet at the poles. Difference 18.6 m, component of 1% lies outside the accuracy of measuring lag distances.

Our standard nautical mile is 1852.0 m = 6076.1 feet is used to calibrate the log scale and for various calculations.

The British consider a nautical mile to be equal to 6080 feet. and call it "Admiralty knot".

They call the length of 1" of the earth's elliptical meridian, i.e., a value that varies with latitude, "Nautical mile" or "Sea mile".

In other countries where other values are adopted for the semi-axes of the ellipsoid And b or where is the radius of the imaginary globe, replacing the earth's ellipsoid, is determined not from a comparison of volumes, but by other methods, for example. By comparing the surfaces, there and for the nautical mile we obtain values that are slightly different from 6080 feet, but close to them. The table below shows the nautical mile lengths adopted in various countries.

States	Nautical mile length


Germany
Holland


Portugal

Samoilov K. I. Marine Dictionary. - M.-L.: State Naval Publishing House of the NKVMF of the USSR, 1941

nautical mile

a unit for measuring distances at sea, equal to the arc length of the earth's meridian in 1'. IN various countries The mile is defined at different latitudes, so it has different meanings. In Russia, a nautical mile is taken at latitude 44°30’ and is 1852 m, in the UK and Japan - 1853.18 m, in the USA - 1853.24 m, in Italy - 1851.85 m. The international nautical mile is 1852 m.

EdwART. Explanatory Naval Dictionary, 2010

Mile Morskaya

naval unit of length used for measurements at sea, equal to 1852 m. The old Russian mile was equal to 7.468 m.

EdwART. Marine Dictionary, 2010

See what "SEA MILE" is in other dictionaries:

Nautical mile, a unit of measurement of distances at sea. Defined as the length of one minute of the arc of the Earth's circumference. The international nautical mile is 1852 m (6076.04 ft), in the UK the nautical mile is 6080 ft (1853.18 m). Speed equal to 1... ... Scientific and technical encyclopedic dictionary

1 nautical mile is equal to 1852 m Dictionary of business terms. Akademik.ru. 2001 ... Dictionary of business terms

nautical mile- a unit for measuring distances at sea, equal to the arc length of the earth's meridian in 1. An international nautical mile is 1852 m... Marine Biographical Dictionary

nautical mile- A Nautical MILE is equal to the length of one terrestrial minute. meridian For the first time the magnitude of the sea. M. b. established in France in 1880, and the length of 1/4 of the circle of Paris was used to calculate it. meridian, to paradise after a whole series of measurements b. defined in… … Military encyclopedia

Every schoolchild knows perfectly well that a nautical mile is a unit of measurement that calculates distance over large expanses of water. Nowadays this value is not included in the international system physical units, however, it is widely used by almost all peoples, both European and American. That is why in different sources you can find different designations for this indicator. Among these are NM, nmi and others.

The history of the nautical mile

The nautical mile appeared around the Renaissance. Then the sailors calculated the distances that they had to sail on ships, based on the characteristics of the arcs of the earth's meridians. So this naval unit of distance measurement was equal to the length of one degree of the meridian arc, and was calculated using a complex mathematical formula. However, due to the fact that our planet had and still has the shape of an ellipse, this arc minute in practice was not a constant value. Since the radius of curvature in certain latitudes of the ellipsoid is different, such a value as a nautical mile would be smallest near the equator and largest at the Earth’s poles.

Final adoption of this metric unit

In this regard, in the twentieth century, in particular in the USSR, the average standard unit of measurement of distance in the sea was adopted. The formula by which this value was calculated was based on an angle of 45 degrees, and the result was a number equal to 1852 meters. Despite the fact that the nautical mile can be converted into units of measurement so familiar to us, it is not used as a metric measure. Since it is based on one degree of arc of the meridian of our planet, it becomes an angular unit of measurement. In matters related to shipping, especially over fairly long distances, this is very convenient and acceptable.

Mathematical division of one mile

As we can see, a nautical mile in total is almost two kilometers. In some cases, this value is too large for sea travel. That is why this value was divided into cables. There are 10 cables in one mile, which in turn is equal to one-third of a naval league. This value is not used in shipping and other sciences, but sometimes it serves as a guideline that allows you to make more accurate calculations and lay out a more detailed and correct sea route.

What other miles are there?

Knowing the features of American units of measurement, many people are confused about what 1 nautical mile is equal to. In this country, this measure is used not only in shipping, but also overland distances. One US mile, which is often used to indicate the speed of a car and the distance it travels, is equal to 1609.344 meters. It is also worth noting that in this country, in some cases, there are differences in maritime units of measurement of lengths. Thus, a nautical mile in the states in some documents is equal to 1853.249 meters. However, if it is necessary to export cargo according to documents concluded with the countries of Europe and Asia, then it is applied international system measurements, which was recognized as official in 1929.

Zel is a unit of speed equal to one nautical mile per hour.

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 the re-decision they began to be called...

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What is a sea knot? The speed at which a ship floats on the waves is determined by sailors in knots. So what is this unit of speed and why is it called a “knot”?

The fact is that ancient sailors used a special device, which they called a “log,” to measure the speed of their ship. The log at that time was a simple log with a rope tied to it. Knots were tied along the entire length of this rope, at the same distance from each other. The other end of the rope was secured to the side of the ship.

To measure the speed at which a ship was sailing, an ancient sailor threw a log overboard and counted how many knots of unwinding rope would pass through his hands in a certain period of time and, by their number, determined the speed of the ship. And to designate it, sailors in the old days began to use the word “knot,” which is still used today.

What does a modern maritime “knot” mean? The speed at which...

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Instructions

In maritime practice, it is customary to measure the speed of a ship in knots. One knot is the speed that allows you to travel one nautical mile in an hour. In terms of our usual kilometers, one knot is 1.852 kilometers per hour. Accordingly, to convert knots to kilometers per hour, it is enough to multiply the speed in knots by 1.852.

If you have the Internet at hand, to convert knots to kilometers, just go to the Google search engine and enter a phrase like “5 knots to kilometers.” Google is a smart search engine and has a built-in calculator for converting units, so it will show the information you are looking for on the results page. For example, for the example search phrase it will show “5 knots = 9.26 kilometers”. Kilometers here mean speed in kilometers per hour.

The existence of knots in maritime practice is closely related to the concept of “nautical mile”. Initially, it was taken as the length of the Earth's surface measuring one...

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When the first ships began to sail the sea, navigators could not determine their location on the open sea with great accuracy. Then they learned to determine the longitude and latitude of the place where the ship was located. Latitude is the distance north and south of the equator. Longitude is the distance west or east of zero degree. It was agreed that zero degrees of longitude would be the longitude at which the observatory in Greenwich, England, is located.

To determine longitude, ancient sailors calculated how far they sailed in a certain period of time. To do this, they used a special device - a “lag”. It was an ordinary log to which a rope was tied. The log was thrown overboard from the stern of the ship, and they waited until the rope became taut.

Knots were tied at regular intervals along the entire length of the rope. The sailor, lowering the rope, counted how many knots passed through his hands in a certain time. This is how the speed of the ship was calculated. Sailors began to use...

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Home > Other > Why is speed measured in knots at sea?

Why is speed measured in knots at sea? Form for quickly converting speed in knots to km/h.
Speed in knots:
Fractions through a dot
Result:
A little history about sea knots.

Measuring speed in knots has happened historically. In those ancient times, it was quite difficult for sailors to navigate the sea. Gradually they learned to determine longitude and latitude by the distances from the equator or zero degree. When they tried to determine what degree was zero, it was at the observatory in the city of Greenwich, and they decided that zero degree would pass through this place.

But in those years there were no navigation instruments, and in order to determine the distance it was necessary to somehow measure the distance traveled. A special device was invented - a “lag”. This is the most ordinary log with a rope tied to it, which they threw overboard and waited for the rope to stretch.

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§ 9. Marine measures of length and speed The unit of measurement of distances at sea is the nautical mile, equal to the linear length of 1" arc of the meridian of the globe, i.e. 1852 m 66070 ft. In addition to the nautical mile, the following units of length are also accepted for measuring distance at sea :
When solving questions of increased accuracy, it should be remembered that the Earth is not a sphere, but a spheroid. Thus, the length of one nautical mile, adopted in the USSR, corresponds to the linear length of 1" of the earth's spheroid at a latitude of 44°. The length of 1" arc of such a spheroid in the equator region is 1842.9 m, at the pole - 1861.6 m. The difference is 18.7 m (about 1%) is neglected in practice.

The speed of a sea vessel is measured in knots, i.e. the number of nautical miles it travels in 1 hour. They say, for example, that a ship has a speed of 12 knots, i.e. it travels 12 nautical miles per hour.

When navigating on inland waterways, metric units are often used to measure distance and speed....

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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 (exactly) 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).

Green is a unit of speed equal to one nautical mile per hour.

Since there are different definitions of a nautical mile, accordingly, the node may have different...

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mile is a unit of distance measurement introduced back in Ancient Rome. Translated from Latin language means 1,000 steps. The military Romans, walking along the roads of the empire, measured distances in double steps. Initially, the Roman mile corresponded to 1,475 meters. This measure was used in many countries in ancient times. However, with the introduction of the metric system of measures, known as SI, its use declined significantly. One way or another, today in some countries this travel measure of length is still used. It should be noted that the size of a mile varies greatly in different corners world from 0.58 km to 11.3 km. Moreover, back in the 18th century in Europe there were about 46 units of measurement, which were called miles.

Today, there are several types of miles in use in different areas. Speaking about the most popular of them, we can name:

Land miles
Nautical miles

Let's look at each of them in more detail.

Nautical miles

A nautical mile is a unit of measurement of the distance between destinations traveled by a ship. This measure is widely used in shipping and also in aviation. Essentially this average length arcs of one arc minute of the meridian. The use of this measure was proposed by Gerard Mercator, a Flemish cartographer and geographer. In Russia, the nautical mile has been used since the time of Peter the Great. And today, when seafarers are asked to switch to kilometers, they answer that they do not plan to do this. However, this is justified. After all, a nautical mile is, in fact, a path corresponding to the distance between two geographical coordinates one minute of latitude.

How many kilometers are there in a mile? Here are the formulas for converting miles to kilometers and vice versa.

Formula for converting nautical miles to kilometers

1 nautical mile = 1,852 meters = 1,852 kilometers

Let's derive the formula for converting kilometers to nautical miles

1 nautical mile = 1.852 kilometers
1,000 nautical miles = 1,852 kilometers
1 kilometer = 1000/1852 miles (roughly equal to) 0.54 miles

Formula for converting kilometers to nautical miles

1 kilometer = 1000 / 1852 miles? 0.54 miles

Land miles

The land mile is used primarily in English speaking countries, and corresponds to a value equal to 1,609 meters. The land mile is used in the United States, for this reason it is sometimes called the American mile. Accordingly, if you need to find out: how many kilometers are in an American mile or, what is the same, how many kilometers are in a US mile, then the above value should be used. This unit can also be found under the names British or statute mile.

Formula for converting land miles to kilometers

1 land mile = 1,609 meters = 1,609 kilometers

Formula for converting kilometers to land miles

1 km = 1000/1609 land mile = 0.6215 land mile

In addition to those described, there are also:

geographical or German mile equal to 7,420 meters (7.42 km);
Old Russian mile equal to 7,467.6 meters (7.4676 km).

1 mile is how many kilometers in Russia?

I would also like to note that in Russia this measure of length is not used, because there is nothing to measure in these units of measurement in the Russian Federation. Sailors have global nautical miles (see above).

Often there is a need, for example, when solving a problem to find out: how many miles are in a kilometer or vice versa? Here it is worth clarifying which mile (land or sea) needs to be converted. Or maybe the Old Russian mile or the German one? And depending on this, you can convert this value into the usual kilometers. Let's look at several problems of converting miles to kilometers and back. To be specific, let us clarify that to solve problems we will convert nautical miles to kilometers (1 nautical mile = 1.852 kilometers).

Convert miles to km

Problem #1: 1 mile - how many km? Solution: Using the above formula, we get: 1 * 1.852 = 1.852 km. Answer: There are 1.852 kilometers in one mile.	Problem #5: How many kilometers are there in 10 miles? Solution: 10 * 1.852 = 18.52 kilometers. Answer: There are 18.52 kilometers in 10 miles.
Problem #2: 2 miles - how many km? Solution: Using the above formula, we get: 2 * 1.852 = 3.704 kilometers. Answer: There are 3.704 kilometers in 2 miles.	Problem #6: How many kilometers is 5 miles? Solution: 5 * 1.852 = 9.26 meters. Answer: 5 km is 9.26 kilometers.
Problem #3: A thousand miles - how many kilometers? Solution: 3 * 1.852 = 5.556 kilometers. Answer: 3 miles is 5.556 kilometers.	Problem #8: How many kilometers are 200 miles? Solution: 200 * 1.852 = 370.4 kilometers. Answer: 200 miles is 304.4 kilometers.
Problem #4: 6 miles - how many km? Solution: 6 * 1.852 = 11.112 kilometers. Answer: There are 11,112 kilometers in 6 miles.	Problem #9: Convert 36 miles to km. Solution: 36 * 1.852 = 66.672 kilometers. Answer: 36 miles - 66.672 kilometers.