Which type of fixes are classified as initial approach fixes on the IAP Charts?

Initial approach fixes (IAFs) are specifically designated as points in the terminal area where an aircraft initiates its approach to a runway. These fixes are crucial in the Instrument Approach Procedure (IAP) as they provide a reference point for pilots to begin their descent and approach sequence.

The designation of these fixes as IAFs indicates that they are precisely marked on the approach chart, helping pilots identify where to begin the formal approach segment of their flight. This ensures that the pilot is following a structured path that integrates safely with air traffic, particularly in busy terminal environments.

Fixes within the terminal area can include a variety of points, but only those labeled as IAF play a significant role in marking the beginning of an approach procedure. Therefore, not all fixes in the terminal area or other types of waypoints fulfill the specific function of an initial approach fix. Visual flight rules (VFR) waypoints and other navigation aids like VORs are useful but do not specifically denote the start of an instrument approach, as they do not hold the same regulatory significance as IAFs.