Plain English Meaning

Two types of ground radio stations that an aircraft can tune in to figure out which direction the station is from the aircraft. The VOR is the more precise, modern one; the NDB is older and simpler. Pilots use them to follow set paths through the sky or to fly toward a specific point.

Full Definition

VOR/NDB refers to two ground-based radio navigation aids used by aircraft to determine bearing to or from a fixed station. A VOR transmits VHF signals that allow the aircraft's receiver to display the radial (magnetic bearing) the aircraft is on relative to the station. An NDB transmits a low or medium frequency non-directional signal that an aircraft's Automatic Direction Finder () receiver uses to indicate the to the station. On an , VOR and NDB information is typically presented on the (HSI) or a bearing pointer, allowing to , intercept , or home to the station.