At what threshold does the CMWS ECU hand over the spatial coordinates of the target?

The correct choice is Cue. In the context of the CMWS (Common Missile Warning System) ECU (Electronic Control Unit), the handover of spatial coordinates of the target typically occurs at the Cue stage. At this point, the system has identified a potential threat and is preparing to provide the necessary information that allows operators or subsequent systems to respond effectively.

During the Cue phase, the system has enough data to accurately represent the threat's location, which is crucial for informed decision-making regarding countermeasures or other responses. Recognizing this threshold as the point for handing over spatial coordinates highlights the importance of timely and accurate information in the overall effectiveness of threat management in military operations.

Other stages such as Alert, Response, and Engagement relate to different points in the operational timeline and focus on initial detection, action taken in response to threats, and the actual execution of countermeasures, respectively. However, it is at the Cue stage that the vital data regarding spatial coordinates is shared, facilitating situational awareness and coordination among the response teams.