Private Pilot Private Exam

When an air traffic controller issues radar traffic information, what reference is used for the 12-hour clock?

1. The aircraft's altitude

2. The aircraft's ground track

3. The aircraft's heading

4. The aircraft's flight path

The correct answer is: The aircraft's ground track

When an air traffic controller issues radar traffic information using a 12-hour clock reference, the reference point is the aircraft's ground track. The ground track is the actual path that the aircraft follows over the ground, which is crucial for locating other aircraft relative to the ones being flown. In this context, the 12-hour clock reference helps pilots understand the relative position of other aircraft in relation to their own position and direction. For instance, if another aircraft is reported at "3 o'clock," it means that the other aircraft is positioned to the right of the reporting aircraft's ground track. Using the ground track as the reference ensures that the information provided is consistent regardless of the aircraft's heading or altitude, which can vary significantly. Hence, this method provides clarity and aids in safe navigation by allowing pilots to visualize their position concerning other traffic effectively.