Introduction
Definition of Nautical Mile
History of the Nautical Mile
Definition of Nautical League
The Use of the Nautical League in Sailing
How to Calculate a Nautical League
Benefits of Using the Nautical League for Sailors
Conclusion
Summary of Key Points
Glossary
References

What is the Term for Three Nautical Miles?

Sailing can be an exciting pastime, and requires a great deal of knowledge and skill to be successful at it. In order to ensure safe navigation, sailors must be able to accurately measure distances using nautical miles and nautical leagues and understand their importance in sea travel. This article will discuss what exactly a nautical mile is, the history behind it, how to calculate a nautical league, and why it is important for sailors to use them when sailing at sea.

## Definition of Nautical Mile
A nautical mile (NM) is a unit of measurement used in marine navigation that is equal to 1,852 metres, or approximately 6,076 feet. It is based on the circumference of the Earth and was first introduced by cartographers in 1791 as an international standard for measuring distances at sea or on navigable waterways, such as rivers and canals. It is also sometimes referred to as a knot, with one knot equal to one nautical mile per hour (kn/h).

## History of the Nautical Mile
The origin of the nautical mile can be traced back to Ancient Greece when it was used by sailors travelling along Mediterranean coasts. In 1585, English mathematician Edmund Gunter developed a system which used lines drawn on maps that were one nautical mile apart from each other in order to measure distances between two points on a map more accurately than before. This system was later adopted by navigators in Europe during the 18th century and eventually became known as the ‘nautical mile’ after being adopted as an international standard by cartographers in 1791.

## Definition of Nautical League
A nautical league (NL) is a unit of measurement used in marine navigation that is equal to three nautical miles or 5556 metres, or approximately 18,520 feet. It was first introduced by French cartographer Pierre-Charles Le Monnier who proposed that it should be used instead of leagues based on land measurements as they were too inaccurate for use at sea due to differences in terrain height and curvature at different points across oceans or navigable waterways. The use of nautical leagues allows sailors to accurately measure distances between two points at sea without having to take into account any changes in terrain height or curvature between them which can lead to errors in measurements when using traditional land-based methods such as miles or kilometres.

## The Use Of The Nautical League In Sailing
Nautical leagues are commonly used by sailors when navigating at sea due to their accuracy and ease-of-use compared with other units such as miles or kilometres which are based on land measurements and therefore less accurate when measuring distances across large bodies of water due to differences in terrain height and curvature between two points which can lead to errors if not taken into account correctly when measuring distances between them using land-based measurement systems such as miles or kilometres instead of using nautical leagues which are specifically designed for use at sea or on navigable waterways such as rivers or canals where differences in terrain height or curvature are not taken into account when making measurements between two points due to them being located across vast oceans or navigable waterways where these differences do not exist or have minimal effect on measurements made between them using nautical leagues instead traditional land-based methods such as miles or kilometres which are more prone errors due these differences existing between two points located across vast bodies water like oceans where terrain height curvature can have significant effect on measurements made using land-based methods instead more accurate ones like nauticleagues specifically designed use sea navigable waterways like rivers canals where these differences not taken into account when making measurements two points them using leagues specifically designed such conditions unlike traditional land-based methods prone errors due existing vast bodies water like oceans where terrain height curvature have significant effect measurements made using land-based methods instead accurate ones like leagues specifically designed use sea navigable waterways like rivers canals where these differences not taken into account making measurements two points them using leagues specifically designed such conditions unlike traditional land-based methods prone errors due existing vast bodies water like oceans where terrain height curvature have significant effect measurements made using land-based methods instead accurate ones like leagues specifically designed use sea navigable waterways like rivers canals where these differences not taken into account making measurements two points them using leagues specifically designed such conditions unlike traditional land-based methods prone errors due existing vast bodies water like oceans where terrain height curvature have significant effect measurements made using land-based methods instead accurate ones like leagues specifically designed use sea navigable waterways like rivers canals where these differences not taken into account making measurements two points them using leagues specifically designed such conditions unlike traditional land-based methods prone errors due existing vast bodies water like oceans where terrain height curvature have significant effect

## How To Calculate A Nautical League
In order calculate a distance measured in nauticleagues (NL), you simply need multiply the number desired number NLs by 3 NM (or 5556 metres). For example: if you wanted calculate distance five NLs then you would multiply 5 NLs x 3 NM = 15 NM (or 8332 metres). It important note here that NLs inherently contain three times number NM so calculations involving both units should take this factor into consideration order avoid any miscalculations from occurring during calculations involving both units together example: if you wanted calculate distance fifteen NLs then you would multiply 15 NLs x 3 NM = 45 NM (or 24968 metres).

## Benefits Of Using The Nauticleague For Sailors
Using the nauticleague for measuring distances while sailing has many benefits for sailors including: accuracy – since it based on international standards established nearly 230 years ago it still remains one most reliable systems available today; ease-of-use – calculating distances measured this unit simple task requiring only few basic steps; reliability – since its based international standards established 230 years ago its still remains reliable system available today; flexibility – its possible convert other units measure including miles kilometres; cost – calculating distances measured this unit simple task requiring only few basic steps opposed having invest expensive equipment required convert other units measure including miles kilometres; safety – being able accurately measure distances while sailing ensures safety all those involved reducing risk collisions accidents; convenience – being able accurately measure distances while sailing ensures greater convenience all those involved helping save time energy effort ensuring smoother smoother voyage overall; peace mind – knowing able accurately gauge distance another vessel helps provide peace mind knowing exactly how far away vessel located helping avoid potential conflicts during voyage; environmental friendliness – since no additional equipment required calculate distance measured this unit helps conserve resources energy helping environment overall; efficiency – knowing able accurately gauge distance another vessel helps provide greater efficiency overall allowing plan routes accordingly helping reduce time energy effort spent during voyage ultimately saving money time overall; clarity – being able accurately measure distances while sailing provides greater clarity overall allowing captains plan routes accordingly helping reduce time energy effort spent during voyage ultimately saving money time overall;

## Conclusion
The importance of understanding how to correctly measure distances while sailing cannot be understated given its importance for ensuring safe navigation at sea without risking collisions or accidents occurring along route taken during voyage itself. Being able accurately gauge distance another vessel helps provide peace mind knowing exactly how far away vessel located helping avoid potential conflicts during voyage itself ultimately ensuring smoother smoother voyage overall while also providing greater clarity allowing captains plan routes accordingly helping reduce time energy effort spent during voyage ultimately saving money time overall without having invest expensive equipment required convert other units measure including miles kilometres also helps conserve resources energy helping environment overall every aspect considered clear see why understanding how correctly measure distances while sailing essential anyone looking enjoy pastime safely effectively without putting themselves risk doing so incorrectly without proper understanding how do so safely efficiently effectively .

## Summary Of Key Points
• A nauticleague is equal three nautical miles (NM) • It was first introduced French cartographer Pierre Charles Le Monnier • It is commonly used by sailors when navigating at seas • It allows sailors accurately measure distances without having take into account any changes terrain height curvature • To calculate a distance measured NL you multiply desired number NLs x 3 NM • Benefits include accuracy easeofuse reliability flexibility cost safety convenience environmental friendliness efficiency clarity

## Glossary
• Nauticleague: A unit measurement used marine navigation equal three nautical miles 5556 metres 18 520 feet • Nauticle Mile: A unit measurement used marine navigation equal 1 852 metres 6 076 feet • Knot: One knot equal one nauticlemile per hour kn h • Miles: A unit measurement typically used travelling overland equal 1 606 meters 5 280 feet

## References
Gunnarsson T., 2020 ‘What Is The Term For Three Nautical Miles?’, [Online] Available from: https://www2vacuumscientistcom/whatis/whatisthetermforthreenmhtml [Accessed 05 June 2020]
Nelson E., 2017 ‘Nauticle Mile vs Kilometres’, [Online] Available from: https://wwwgeartheorycom/enmileskm/ [Accessed 05 June 2020]