Under which condition can radar identification and altitude control be transferred without verbal coordination?

Radar identification and altitude control can be transferred without verbal coordination during radar handoff. This transfer is generally part of established procedures that enable controllers to move radar services from one sector or controller to another while maintaining continuity of service for the aircraft.

When a radar handoff occurs, the identification and altitude information is typically shared electronically between the systems used by the controllers, allowing for a seamless transition. This is particularly important in maintaining situational awareness and ensuring that the aircraft is continually monitored as it moves between different airspace sectors.

In contrast, other conditions, such as an aircraft's altitude changes, pilot agreements, or communication congestion, do not guarantee a standard procedure for transferring control without verbal coordination. Each of those scenarios would still generally require some form of explicit communication to ensure all parties are aware of the situation and to confirm actions taken.