The speed of movement of ships is usually expressed in knots. One knot is the speed that allows a ship to travel one nautical mile in one hour. In terms of the units of measurement familiar to most people, one knot is 1.852 kilometers per hour.
In nautical practice, it is customary to measure the speed of a vessel in knots. One knot is such a speed that you can cover 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, in order to convert the nodes into kilometers, you just need to go to the Google search engine and enter a phrase like "5 nodes per kilometers". Google is a smart search engine and has a built-in unit conversion calculator, so it will show you the information you are looking for on the results page. For example, for the search phrase used as an example, it will show the inscription "5 knots = 9.26 kilometers". Kilometers here mean the speed in kilometers per hour.
The existence of knots in nautical practice is closely related to the concept of "nautical mile". Initially, it was taken as the length of the Earth's surface in the size of one arc minute. If the ship moved along the meridian for one minute of latitude, it was said that it had covered one nautical mile. Later, the mile was equated to 1852 meters.
The very name "knot" comes from the method of measuring the speed of ships using a log. The lag was a triangular board with a string and a load tied to it. They threw him astern and counted the number of knots tied on the string, which went overboard in one minute.
Modern boats sail much faster than those that were used in the days of using rope logs. So, sports yachts manufactured by Columbus are equipped with powerful diesel engines capable of accelerating the vessel to a speed of 22 knots - about 40 kilometers per hour. And on one of the "40" class sports yachts, the English athlete Nick Bubb was able to reach a speed of 34 knots - about 60 kilometers per hour.