What does ADF stand for in aviation navigation?

ADF stands for Automatic Direction Finder in aviation navigation. This system is used to navigate aircraft by determining the direction to a radio beacon. The ADF receives signals from ground-based non-directional beacons (NDBs) and displays the direction to the pilot, allowing for accurate navigation by referencing these signals.

The term "Automatic" highlights that the equipment automatically tracks and indicates the direction without requiring manual adjustment or intervention, which is essential for modern navigation systems. The ability to continuously track the radio signal enhances situational awareness and assists pilots in maintaining their intended flight path, especially in areas where visual references are scarce.

In contrast, other terms like "Aeronautical Direction Finder" and "Aircraft Directional Finder" do not reflect the automatic functionality that characterizes the ADF. Additionally, "Aerial Distance Finder" is unrelated to the ADF's purpose and capabilities, as it implies a focus on distance measurement rather than directional navigation.