Patent ID: 7683782

Claim:
An RFID system for locating a plurality of entities within a structure, the system comprising: a plurality of portable units, a portable unit comprising a storage, a unique identity, and an RF transmitter/receiver transported by an entity within the structure; a base unit comprising an RF transmitter/receiver and a display; a plurality of passive RFID tags; and wherein the RF transmitter/receiver records a location of an RFID tag, the unit stores the location of the RFID tag in the storage, and the RF transmitter/receiver broadcasts the identity of the unit and the location of the RFID tag to the base unit, which maintains a log of the identity of the unit and the location of the RFID tag, determines the location of the entity from the location of the RFID tag, determines the identity of the entity from the identity of the unit, and maintains a log of the location the entity; wherein the RFID tags contain unique location information encoded according to a predetermined standard; wherein the RFID tags are disposed at predetermined intervals within the structure determined according a predetermined standard of placement; wherein the base unit transmits an interrogation signal to an active RFID tag and receives a schematic of the structure; and wherein the base unit displays the schematic on the display and displays the location of the portable RF transmitter/receiver, the identity of the entity, and the log overlaid on the schematic.