Abstract: A locator system, including a transmitter device such as a PAS device to be carried by a first individual such as a first responder in a fire fighting event. The transmitter transmits an acoustic sound and a RF pulse. A RF receiver is carried by a second individual, such as someone dispatched to rescue the first individual. The receiver receives the acoustic sound using a pair of acoustic receivers and RF pulse and calculates the distance to and bearing of the transmitter device. Both transmitter and receiver may include temperature data for calculating the ambient speed of sound. A display informs the second individual of the distance and bearing. The acoustic sound receivers are spaced from each other to permit triangulation calculations to determine the distance and bearing. The transmitter is activated by the first individual by choice and when the first individual is motionless for a predetermined time.