Automatic Direction Finder (ADF)

Definitions

• Electronic navigation equipment that operates in the low- and medium-frequency bands. Used in conjunction with the ground-based nondirectional beacon (NDB), the instrument displays the number of degrees clockwise from the nose of the aircraft to the
• An aircraft radio navigation system which senses and indicates the direction to a L/MF nondirectional radio beacon (NDB) ground transmitter. Direction is indicated to the pilot as a magnetic bearing or as a relative bearing to the longitudinal axis of the aircraft depending on the type of indicator installed in the aircraft. In certain applications, such as military, ADF operations may be based on airborne and ground transmitters in the VHF/UHF frequency spectrum. (See BEARING.)
  (See NONDIRECTIONAL BEACON.)

References

• Pilot Controller Glossary, Federal Aviation Administration, 2023
• Pilot's Handbook of Aeronautical Knowledge, Federal Aviation Administration, 2023