When should you initiate a turn while being radar vectored?

Initiating a turn while being radar vectored is primarily based on air traffic control (ATC) instructions. The best practice is to follow what ATC has directed you to do, which emphasizes the importance of communications with air traffic controllers in managing air traffic safely and efficiently.

When vectored by ATC, they may give you specific instructions to turn in order to establish proper spacing from other aircraft, to align you with the final approach, or for other traffic management reasons. Thus, the correct response to initiate a turn is to act as instructed by ATC. Understanding and adhering to the directives given by ATC is crucial for maintaining operational safety and efficiency during flight operations.