What best characterizes Class G airspace?

Class G airspace is best characterized by its lack of specific vertical limits and its classification as uncontrolled airspace. This means that, unlike controlled airspace, aircraft operating in Class G do not require communication with Air Traffic Control (ATC) to maintain safety and separation from other traffic.

Class G airspace can exist at various altitudes, typically extending from the surface to the base of the overlying Class E airspace, which can vary significantly depending on geographical location. It is primarily used by general aviation pilots who operate under visual flight rules (VFR). The absence of ATC oversight in this airspace allows for more flexibility and autonomy, but also places the responsibility for maintaining safe separation from other aircraft directly on the pilot.

Understanding that Class G is uncontrolled enhances a pilot's situational awareness and operational planning, especially in terms of traffic management and altitude selection during flight.