The document describes a cargo tracking system that uses electronic locks and GPS to monitor cargo containers and prevent pilferage. It discusses:
1) The need for improved cargo security given threats to global supply chains. Container shipping is vulnerable and electronic locks with GPS can help track containers and detect unauthorized opening.
2) The components of the cargo tracking system, which includes tracking devices attached to containers that use GPS and GSM to send location and lock status updates.
3) How the system works, with electronic locks activated during transport and only opening after verifying passwords and driver identity upon arrival at destinations. Any unauthorized opening triggers an alarm.