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Why Are The Units Used At Sea For Nautical Mile And Knot?

Today we are going to talk about Why Nautical Mile and Knot Are the Units Used at Sea. Due to storms and technical failures on ships at sea the right direction cannot be known and it is difficult to navigate in the open sea like land there. For navigators in the ocean while the land offers a number of fixed visible signs in the landscape. Nautical miles on the ship, a unit of measurement defined as 1,852 meters and based on the circumference of the earth and is equal to one minute of latitude. So let's gather a little more information about Why Nautical Mile and Knot Are the Units Used at Sea.

What Is The Difference Between A Nautical Mile And Knot


Why Are The Units Used At Sea For Nautical Mile And Knot?

1. Nautical Mile

Nautical miles means that if a person were to cut a planet in half at the equator and take a part of the earth and consider the equator as a circle, it could be divided into 360 degrees. And then one degree can be divided into 60 minutes of which one minute arc on Earth is 1 nautical mile. 

One nautical mile is slightly longer than the legal mile. The nautical mile is 6,076 feet according to the English measurement system. The nautical mile is defined as the unit of measurement used for the definition of air, sea and space exploration and regional water. Historically the Nautical Mile was defined as a minute.

Unit symbol of Nautical Mile

There is not a single internationally agreed symbol for the nautical mile but many symbols are used.

1. M- This symbol is used by the International Hydrographic Organization as an acronym for Nautical Mile.

2. NM- This symbol is used on ships by the International Civil Aviation Organization.

3. nmi- The symbol is used on ships by the Institute of Electrical and Electronic Engineers and the United States Government Publishing Office.

4. nm- This symbol is a standard abbreviation used in many marine applications and texts, including U.S. Government Coast Pilot and Sailing Guidelines.

Other Information

The word Nautical Mile comes from the Latin word for a thousand speeds. The Nautical Mile was invented by the sea navigation eye. The Nautical Mile dates back to about 1500 when navigational instruments were developed and cartographers began to use a coordinate system with parallel meridians of latitude and longitude.

France and other metric states state that in theory the meridian is the arcminute of the meridian at latitude of 45 a, but the Nautical Mile is the modern justice for a more physical calculation developed over a century ago. In the mid-19th century, France defined this type of mile by the original 1791 definition of the meter, which is a ten-millionth part of the quarter meridian.

The United States picked up five significant digits for its nautical mile 6080.2 feet, while the United Kingdom picked up four significant digits for its admiralty mile 6080 feet.

2. Knot (unit)

Knot is an approximate unit of speed of one nautical mile per hour which is found to be 1.15078 miles per hour. There are nautical miles and knots available to explain the speed of a ship in the sea, such as the measurements of speed and distance on land. The Knot is a unit of motion equal to one nautical mile per hour. The ISO standard symbol for The Knot is kn. The Knot is the same symbol chosen by the Institute of Electrical and Electronics Engineers.

In aviation The Knot is a form recommended by the International Civil Aviation Organization. The Knot is a non-SI unit. The Knot is used for meteorology and marine and air research. A ship traveling at 1 knot with a meridian in the ship travels about one minute of geographical latitude in an hour.

Definitions of The Knot

1 international knot = 1 nautical mile per hour,
                                   1852.000 meters per hour,
                                   0.51444 meters per second Approx,
                                   1.15078 miles per hour Approx,
                                   20.25372 inches per second Approx,
                                   1.68781 feet per second Approx

Other Information

The length of the internationally agreed nautical mile is 1852 m. The USA adopted the international definition for The Knot in 1954. Symbol of The Knot is kn or kt. The speed of the boat and the speed of the wind relative to the fluid in which the tourist travels are measured in The Knot. The speed of navigational fluids and the speed of wind are also measured in The Knot. 

The speed of the ground and the rate of progress towards the distant point are also given in The Knot. The Knot originated in the mid-19th century when the speed of ships at sea was measured using chip logging. The origin of The Knot consists of a wooden panel that is attached to the reel by a line and is loaded on one edge floating perpendicular to the surface of the water.

Although The Knot does not fit within the SI system, retention of The Knot is important for maritime and aviation use as the length of the nautical mile depends on The Knot. The Knot is closely related to the longitudinal or latitude geographical coordinate system. As a result The Knot is a convenient unit when navigating a ship.

Conversions Between Common Units Of Speed

1m/s = 1 m/s, 3.6 km/h, 2.236 936* mph, 1.943 844* knot, 3.280 840* ft/s.

1 km/h = 0.277778* m/s, 1 km/h, 0.621371* mph, 0.539957* knot, 0.911344* ft/s.

1 mph = 0.44704 m/s, 1.609344 km/h, 1 mph, 0.868976* knot, 1.466667* ft/s.

1 knot = 0.514444* m/s, 1.852 km/h, 1.150779* mph, 1  knot, 1.687810* ft/s.

1 ft/s = 0.3048 m/s, 1.09728 km/h, 0.681818* mph, 0.592484* knot, 1 ft/s.

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