US Patent 8941474 Real time automatic headcount system

A real time automatic headcount system is configured with a portable transmitter operated by a crisis coordinator and operable to output an alert signal which is received by a plurality of receivers which are coupled to respective persons associated with a crisis-event site. The receivers each generate an acknowledgement signal transmitted via a central processing unit to the transmitter. Upon receiving the acknowledgement signal, the central processing unit is operable to update a check list of all person associated with the crisis-event site, identify those who have not been accounted for and implement back up procedures for locating and accounting for the previously unaccounted for persons in real time.