Visible Area Map 2 : A map showing the specific territory of which either the ground surface or its vegetation is directly visible from a lookout point. See: Seen Area Map
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}