Some articles on ids, gps ids:

Tracking System - Tracking in Real World - Attendance Management
... use of the RFID technology is in tracking IDs of students ... Using GPS IDs would resolve the decreasing attendance in schools by monitoring the whereabouts of students when they did not attend class (Jensen ... The GPS IDs also act as a security measure to monitor any unwanted visitors or an emergency locator if a student cannot be found (Jensen, 2008) ...