A method, computer program product and system for monitoring and locating an object using secure communications without relying on GPS. A monitoring device may activate a monitored unit (unit monitored by monitoring device) by transmitting a seed of an algorithm and a time synchronization to the monitored...http://www.google.es/patents/US7050906?utm_source=gb-gplus-sharePatente US7050906 - System for monitoring and locating people and objects
System for monitoring and locating people and objects
