Which of the following statements about vectoring is true when using secondary radar?

The statement that degradation of service affects vectoring capabilities is true when using secondary radar. Secondary radar relies on transponder signals from aircraft, which provide more accurate information about the aircraft's position, altitude, and identity. If the secondary radar experience degradation—whether due to signal interference, equipment malfunction, or other issues—the ability to effectively vector aircraft can be compromised. This is because vectoring relies on reliable and accurate positional information to safely guide aircraft through controlled airspace, maintain safe separation, and provide air traffic control services.

In contrast, vectoring with unreliable targets can pose safety risks, as the accuracy and reliability of data are crucial for making informed decisions. While vectoring happens primarily in controlled airspace and typically initiated by air traffic control rather than by pilot request, these factors do not inherently affect the fundamental concept that service degradation impacts the effectiveness of vectoring operations.