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The U.S. Adopted the global nautical mile in 1954. Shown here: centregalilee.com ship Pisces is the third in a class of state-of-the-art, acoustically quiet fisheries survey vessels built for a wide variety of life marine source surveys and also ecosystem research study projects.

Nautical Miles

Nautical miles are offered to measure up the street traveled with the water. A nautical mile is slightly much longer than a mile on land, equaling 1.1508 land-measured (or statute) miles. The nautical mile is based upon the earth longitude and also latitude coordinates, with one nautical mile equaling one minute of latitude.

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But why usage a various measurement device for marine navigation? making use of latitude and longitude coordinates is much more practical for long-distance travel, wherein the curvature the the planet becomes a variable in exact measurement. Nautical charts use latitude and also longitude, therefore it’s far much easier for mariners to measure distance through nautical miles. Waiting and an are travel additionally use latitude and also longitude for navigation and also nautical miles to measure up distance.

The native “mile” might leave you wonder if yes a “nautical kilometer,” too. Yes not. The international nautical mile is used throughout the world. The measurement was officially set at exactly 1.852 kilometers in 1929 by what is now known as the global Hydrographic Organization. The U.S. And the united kingdom both supplied slightly different measurements after that time, however the U.S. Embraced the global nautical mile in 1954 and also the U.K. In 1970.

Knots


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Measuring the knot in the 17th century.


Knots, top top the other hand, are supplied to measure speed. One knot equals one nautical mile every hour, or approximately 1.15 statute mph.

The hatchet knot days from the 17th century, as soon as sailors measured the speed of your ship making use of a an equipment called a “common log.” The typical log was a rope v knots at continual intervals, attached come a item of hardwood shaped prefer a slice of pie. Mariners would lower the lumber piece into the water and allow it to float easily behind the ship because that a specific amount that time (often measured with an hourglass). Once the time was up, they would count the knots between the ship and also the item of wood, and also that number approximated their speed.

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Did you know?

you can develop your own paper and PDF nautical charts with centregalilee.com practice Charts. It’s basic to zoom in and also explore centregalilee.com’s 3.2 million square nautical miles of charts. Pick your area that interest and also the scale you’d like to use, then download a printable digital copy.