What is Knot Usually Used in Ship

A “knot” is a unit of speed used mainly at sea and in the air. It means one nautical mile per hour, and is written as “kn” or sometimes “kt”. 

What exactly is a knot?
1 knot = 1 nautical mile per hour ≈ 1.852 km/h or 1.15 mph. 

A nautical mile is slightly longer than a “normal” mile on land because it is based on the Earth’s curvature (about the length of 1 minute of latitude). 

Why is it used?
Sailors and pilots use knots because navigation charts and aviation maps are based on nautical miles, so speed in knots matches distance and time more directly. 

You often see knots used for ship speed, wind speed at sea, and airspeed of airplanes. 

Simple conversions (in English)
From knots to km/h: multiply by about 1.85
Example: 10 knots ≈ 18.5 km/h. 

From knots to mph: multiply by about 1.15
Example: 10 knots ≈ 11.5 mph. 
Origin of the word “knot”
Long ago, sailors measured speed by throwing a “log line” with knots tied in it over the side of the ship and counting how many knots passed through their hands in a certain time. 

The number of knots counted became the ship’s speed, and that’s why the unit is called a “knot”.

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