Which dispatch term indicates a unit is en route to a location?

The term "ER" stands for "en route," which directly indicates that a unit is currently on its way to a specific location. In dispatch terminology, this term is crucial for providing real-time updates about the status and movement of units responding to calls or incidents. When a unit is marked as en route, it communicates to the dispatch team and other units that help is on the way, enabling better coordination and anticipation of support needs. This clarity helps enhance operational efficiency and situational awareness within emergency services and other dispatch environments.