The radar flight following of an aircraft, whose primary navigation is being performed by the pilot to observe and note deviations from its authorized flight path airway, or route
Ilan Kelman (ed.), Vulnerability and Resilience Definitions and References, Version 2, 2007. http://www.islandvulnerability.org/docs/vulnres.pd f, (Vulnr and Resilience - Brit) {524}