What type of identification is being used when identifying a station on the air as "Race Headquarters"?

The identification of a station as "Race Headquarters" is an example of a tactical call. Tactical calls are used in specific situations to convey a particular role or purpose rather than identifying the station by its formal call sign. This kind of identification is common in emergency communications, public service events, and organized activities where clarity about the function of the station is essential.

For instance, during a race or event, using "Race Headquarters" clearly indicates the function of the station, making it easier for operators and participants to understand who they are communicating with. Tactical calls help streamline communication without the need for formal call sign exchanges that may not convey the necessary context of the operation.

In contrast, self-assigned designators refer to identifiers that individuals might use informally, while SSIDs (Secondary Station Identifiers) are typically used by amateur radio operators as a way to identify their specific stations within a cluster of calls. Broadcast station refers to commercial broadcasting operations, which have distinct regulatory requirements and operational styles different from amateur radio activities.