VHF Omni-directional Range (VOR) : The VHF omni-directional range provides positive guidance to aircraft on any selected magnetic course to or from the station
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}