What does the term "AGL" stand for in aviation?

The term "AGL" stands for "Above Ground Level." This measurement is crucial in aviation as it represents the height of an object, such as an aircraft, relative to the ground directly below it. This distinction is important for pilots, including remote pilots operating unmanned aircraft systems (UAS), because it provides an accurate assessment of altitude in relation to terrain and obstacles, facilitating safer flight operations.

In practical applications, AGL is commonly used when determining safe altitude levels to avoid buildings, trees, and other obstacles. For example, a drone flying at 100 feet AGL is 100 feet above the surface of the ground, regardless of the elevation of the terrain it is flying over. This is particularly significant in varying landscapes, where ground elevation may change significantly over short distances.

The other options, while they contain aviation-related terminology, do not accurately define “AGL.” Understanding AGL is essential for complying with regulations and ensuring safe operations during flight.