title: Security in Outer Space
abstract: More than a hundred different Global Navigation Satellites orbit the Earth providing Positioning, Navigation and Timing (PNT) services, with the latter capability being the least appreciated or understood.PNT does more than guide motorists, aviators, sailors and hikers. Many industries such as construction, mining, surveying, package delivery, logistical supply chain management, farming, fixed and wireless communications networks, banking systems, defence, security and emergency services, financ