Navigation Lights 1 : Any one of a group of lights mounted on an aircraft to make its dimensions, position, and direction of motion visible at night or under other conditions of poor visibility.
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}