Buoy 04 : A floating navigation aid anchored to the bottom, to mark a channel or to point out the position of something beneath the surface of the water
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}