Patent ID: 7701342

Claim:
A navigation system for use in a predetermined limited space in which a plurality of control points is defined, the navigation system comprising: a plurality of control point RFID tags, each stored with data thereof and disposed near an entrance to control point-controlled lanes in the predetermined limited space; a radio frequency identification (RFID) reader for reading the data stored in the control point RFID tags; a processor for determining, in light of the data read by the RFID reader, a direction or a distance one should preferably go from a current location to a target location; an indicating device for indicating the direction or the distance determined by the processor; and at least one target location RFID tag for storing data about the target location, wherein each of the control points is one selected from the group consisting of an exit, entrance, crossroads, fork junction, end of a lane, and turn; and the processor judges the moving direction or distance in accordance with the data about the target location as well as the data stored in the control point RFID tags and currently read by the RFID reader; wherein the data about the target location is sent to the processor by a source management system in the predetermined limited space via a wireless network; and wherein the data about the target location comprise data regarding directions or distances to the target location from the control point-controlled lanes in the predetermined limited space; wherein the processor determines; at a moment when one reaches the last control point preceding the target location, at least one selected from the group consisting of: a distance from the control point to the target location, whether the target location is on a left side or a right side in a forward direction, and on which floor the target location lies.