Which status indicates that a unit is not currently operational?

The status that indicates a unit is not currently operational is "Out of Service." When a unit is marked as "Out of Service," it signifies that it is unavailable for responses due to various reasons such as maintenance, repairs, or other circumstances preventing it from performing its duties. This status is crucial for accurate resource management and ensures that dispatch knows which units are active and ready to respond to incidents and which are temporarily sidelined.

In contrast, the other statuses serve different purposes: "Busy" indicates that a unit is currently engaged in a call or task, "In Service" means that the unit is operational and available for dispatch, and "Relay" usually refers to a specific communication status or procedure, not an operational state of the unit. Each of these alternatives conveys active operational conditions, whereas "Out of Service" clearly identifies a unit that is unable to perform its functions.