Abstract: A system tracks students on a campus by giving user devices to each student, and monitoring user device locations on a server on entry of user devices to buildings or classrooms. The server identifies students from user device IDs and updates location data and class attendance data and provides current location reports localized to classrooms for students from the location data. In embodiments, the server can transmit messages to user devices according to location data associated with the students. In embodiments, user devices include barcode readers within each user device with barcodes posted at entrances of buildings and classrooms, GPS receivers in user devices, or nearfield radio transponders.