When an amateur radio station is transmitting, where must its control operator be?

When a station is transmitting, the control operator must be physically present at the station's control point. The control point is the specific location where the control functions of the transmitter are accessible, allowing the operator to immediately correct deviations or halt transmissions if necessary. Being in the same building or within a certain geographic radius is not enough; the operator must have immediate access to the controls. Standing at the room's entrance to control physical access does not satisfy the legal requirement to manage the radio equipment itself.