An early-warning security system for monitoring and tracking in real-time or at least in near-real-time the activities and movements associated with prescribed personnel, personal property, mobile vehicles, and buildings. The system comprises a plurality of in situ local controllers having a microprocessor...http://www.google.com/patents/US6873261?utm_source=gb-gplus-sharePatent US6873261 - Early warning near-real-time security system
