1. A method of locating an individual or object within a building as the individual proceeds through the building, comprising the steps of: locating RFID tags within the building, the RFID tags being carried by the individual as the individual proceeds along a path through the building and being dropped along a path as the individual proceeds through the building; and detecting, through the use of a proximity measuring module having an RFID reader the proximity of an individual to RFID tags having known locations, each of the RFID tags being provided with an inertial navigation unit to be able to update a new position of the RFID tag along the path, the position of each of the dropped RFID tag is provided by dead reckoning based on the location of the individual at the entrance of the building through which the individual passes and the number of steps of the individual from the entrance, the dead reckoning including counting the numbers of steps of the individual as he proceeds along the path.