What are "NDBs" in aviation navigation?

Non-Directional Beacons, or NDBs, are radio beacons used in aviation navigation. They operate by transmitting radio waves in all directions, hence the term "non-directional." Pilots use NDBs as reference points during flight; aircraft are equipped with ADF (Automatic Direction Finder) systems to accurately navigate towards these beacons. This allows pilots to determine their bearing relative to the NDB and can assist in a variety of navigation tasks, including approaches and holding patterns.

The significance of NDBs lies in their ability to provide navigation guidance regardless of the aircraft's orientation to the beacon. This is crucial in situations where visibility is poor or during night flying, making NDBs an invaluable asset for ensuring safety and accuracy in navigation.