Technical Background
5.23 Vertical Obstructions (VO)
Vertical obstructions can compromise the value of low‐level flight training by
limiting the areas where such training can occur. These obstructions can
include a range of items from man‐made, such as telephone poles and radio
antennae, to natural, such as tall trees and land features.
Vertical obstructions are created by buildings, trees, structures, or other
features