methods and apparatus to visualize locations of radio frequency identification tagged items are described . one example method includes receiving a request from a portable electronic device to access product information associated with an individual radio frequency identification tagged item , determining a location of the product information in a database , transmitting the located product information to the portable electronic device for display thereon , receiving modified product information associated with the individual rfid tagged item from the portable electronic device , and storing the modified product information to the location of the product information in the database .