What is the function of an NDB?

The correct answer is that a Non-Directional Beacon (NDB) is utilized for navigation and approaches. NDB is a type of radio beacon that transmits a continuous signal that aircraft can receive, allowing them to determine their heading relative to the beacon. Pilots use the ADF (Automatic Direction Finder) on board their aircraft to achieve this.

NDBs are foundational to aviation navigation as they provide guidance, especially in areas where visual references may be limited due to weather or darkness. They assist pilots in locating their position and can also be used for instrument approaches to airports, enhancing safety by providing a reliable navigational aid.

This functionality is critical, as it allows pilots to navigate accurately without needing a direct line of sight to the navigation aid, making NDBs especially useful in challenging flight conditions.