What does the Non-Directional Beacon (NDB) provide for aircraft?

Answer: C — Non-directional signals for navigation

The Non-Directional Beacon (NDB) is a type of radio transmitter that broadcasts signals in all directions. The primary purpose of an NDB is to provide navigational assistance to aircraft. By tuning into the frequency of the NDB, pilots can determine their bearing relative to the beacon. This capability allows for effective navigation even in conditions where visibility may be limited. Unlike directional beacons, which provide specific signals pointed towards certain directions, the NDB's non-directional nature means it transmits signals uniformly around the globe. Pilots use the signals received to triangulate their position and navigate. The information provided by an NDB is particularly useful in approaches and during en-route navigation, supporting situational awareness and guiding pilots towards their intended paths. Thus, the correct answer emphasizes the NDB's role in delivering non-directional signals that aid in navigation, distinguishing it from other functions that do not directly relate to this primary purpose.