Vor - very high frequency omnidirectional range 甚高頻全向信標(biāo)
Visual - aural omnidirectional range 目視和音響全向無線電信標(biāo)
Very omnidirectional range 甚高頻全向信標(biāo)
Vor aeronautical radio navigation aids . part 2 : technical requirements for very high frequency omnidirectional range 航空無線電導(dǎo)航設(shè)備.第2部分:甚高頻全向信標(biāo)