What is the main purpose of using a CTAF frequency?

The primary purpose of using a CTAF (Common Traffic Advisory Frequency) is to communicate with other aircraft operating in the vicinity of an airport, particularly at non-towered airports where air traffic control services are not available. By using this frequency, pilots can announce their positions, intentions, and actions, which helps enhance situational awareness among all aircraft in the area. This communication is crucial for maintaining safety and avoiding collisions, as it allows pilots to make informed decisions based on the movements and intentions of others.

The focus here is on facilitating communication between pilots rather than indicating intent to ground control, as would be the case in a controlled environment. The other options, while related to aviation communication, do not accurately reflect the specific function of CTAF, which is tailored for peer-to-peer communication among pilots in close proximity. Thus, the correct answer effectively captures the essence of the CTAF's role in aviation safety and operations.