Knots are a special unit of speed used in both maritime and aviation settings. While most people are familiar with kilometers per hour or miles per hour, knots remain essential for ships, planes, and weather reports because they connect directly to navigation and safety.

The origin of knots goes back centuries. Sailors measured speed using a rope called a log line, with knots tied at regular intervals. By throwing the line overboard and counting the knots that passed in a set time, they could estimate how fast their ship was moving. This method gave the name to the unit we still use today.

One knot equals one nautical mile per hour. A nautical mile is slightly longer than a standard mile and is based on the Earth’s latitude and longitude. This makes knots ideal for navigation over long distances, whether crossing oceans or flying between countries. Using knots ensures consistency across charts, flight plans, and shipping routes.

In aviation, knots are standard for speed because aircraft navigation relies on nautical miles, just like ships. Pilots, air traffic controllers, and weather forecasters all use knots to communicate speed accurately. Wind speeds are also measured in knots, which helps sailors and pilots understand conditions, plan routes, and maintain safety.

Typical cruising speeds vary by vehicle type. Modern cargo ships usually travel at 20–25 knots, passenger ferries can reach 30–40 knots, and commercial airliners cruise at roughly 450–500 knots. Military aircraft, including supersonic jets, may travel much faster, but even they often reference knots for navigation and planning.

Understanding knots is not just about learning a unit of measurement—it provides insight into how ships and planes navigate safely across vast distances. From historical log lines to modern technology, knots continue to be a practical, reliable standard for anyone traveling by sea or air.