When advising the local controller about an aircraft's location, what must be confirmed?

Confirming that the aircraft is visible on radar is crucial when advising the local controller about an aircraft's location. This visibility is essential for ensuring that the aircraft's position is accurately tracked and that the controller can provide safe separation from other aircraft. Radar data allows for real-time monitoring and enhances situational awareness, which is vital for making informed operational decisions.

While aspects such as airspace clarity, compliance of the aircraft, and effective communication among controllers are important elements of air traffic management, the fundamental requirement in this scenario is the confirmation of radar coverage. Without guarantee of radar visibility, any advice regarding the aircraft's location may not be reliable, potentially leading to unsafe situations. Therefore, verifying radar contact is the key step in maintaining safety and efficiency in terminal operations.