What altitude/heights are typically given in a GFA?

The correct response indicates that altitudes are generally provided in feet above sea level (ASL) unless specifically noted otherwise. This convention is important because aviation operations often reference elevations and altitudes concerning the mean sea level to ensure safety and standardization in navigation and communication. Providing altitude data in feet ASL allows pilots to understand their position relative to a common reference point, ensuring consistency across different regions and types of flights.

While the option specifying feet above ground level (AGL) deals with the aircraft's height above terrain, the primary communication in the context of a GFA refers to elevations and altitudes relative to mean sea level. Similarly, while providing information exclusively in meters may be applicable in other contexts, it is not universally used in aviation settings, where feet ASL is the standard. Lastly, stating only heights above mean sea level, without the ASL specification, can lead to ambiguity in understanding actual altitude levels for flight safety, which is not the focus here. Thus, the emphasis on feet ASL strikes a balance between clarity and adherence to aviation standards.