H-34 Choctaw/Avionics
SECTION 3. AVIONICS
1.1 Introduction
The S-58 supports VOR (Very High Frequency Omni-Directional Range) navigation. VOR navigation is a ground-based navigation system in which a VOR station transmits a signal that is picked up by a NAV radio (see ???) in the aircraft. The VOR transmits two types of signals, an omni-directional pulse, and a rotating directional pulse. The omni-directional pulse is synchronized to occur when the directional pulse is at magnetic north. By measuring the time between the two pulses, the receiver can determine its relative direction, called a radial, from the VOR station. For SL purposes, a virtual VOR station is "placed" at every airport in the[Shergood Airport Map at the location of the airport marker on the map. See Wikipedia: VOR Omnidirectional range for more details on VOR operation.
