When should verbal coordination be initiated prior to accepting track control?

Verbal coordination should be initiated prior to accepting track control when the data block displays CST, which stands for "Control Status Transition." This indicates that there is a planned change in the control status of the aircraft. Initiating verbal coordination at this point ensures that all involved controllers are aware of the impending change and can manage the aircraft's transition effectively. It helps maintain situational awareness and enhances safety by confirming that all parties are aligned on control responsibilities before the control handover occurs.

In contrast, the other options may relate to factors influencing control but do not specifically trigger the need for verbal coordination prior to accepting track control as indicated by the CST designation.