NDB

Definition of NDB

Non-Directional Beacon (NDB) is a radio transmitter that emits radio signals in all directions from a known location, used as a navigational aid for aircraft and ships. The NDB works by transmitting signals at a specific frequency, which is received and detected by the aircraft or ship’s radio receiver. The receiver can then determine its position relative to the NDB based on the strength and direction of the received signal.

NDBs are primarily used for navigating in areas where other navigation aids, such as VOR (VHF omnidirectional range) or GPS (Global Positioning System), are not available or practical. They are also used as back-up navigation aids when other systems fail or in areas where reception is poor. NDBs are often used for instrument approaches to airports, where the aircraft follows a predetermined flight path using radio signals from the NDB.

In addition to their primary use for navigation, NDBs can also be used for weather reporting and emergency communication. They are important for air traffic control and are regulated by aviation authorities to ensure their proper installation and maintenance.