A specialized unit of length for maritime and aviation use, where 1 nautical mile equals 1,852 meters, defined as one arcminute of latitude on Earth. Universally adopted by ships and aircraft worldwide, including in China’s maritime and air traffic control systems. Note: 1 nautical mile ≠ 1 statute mile (1 mi ≈ 0.868976 nMi).

A specialized unit of length for maritime and aviation use, where 1 nautical mile equals 1,852 meters, defined as one arcminute of latitude on Earth. Universally adopted by ships and aircraft worldwide, including in China’s maritime and air traffic control systems. Note: 1 nautical mile ≠ 1 statute mile (1 mi ≈ 0.868976 nMi).