Omnidirectional radio range (ORR) refers to a navigational aid used in aviation that provides pilots with a means of determining their position relative to a radio transmitter on the ground. ORR is commonly used as a supplemental navigational system, particularly during approaches and departures.
An ORR system consists of a ground-based transmitter, often called the ORR station, which emits radio signals at a specific frequency. These signals are received by the aircraft's onboard receiver, allowing the pilot to interpret the signal and determine their position relative to the ORR station.
The term "omnidirectional" in ORR refers to the ability of the transmitter to emit radio signals in all directions, providing uniform coverage over a specific area, typically within a range of around 200 nautical miles. This allows pilots to receive signals regardless of their aircraft's heading or orientation relative to the ORR station.
ORR signals are often accompanied by Morse code identifications for identification purposes. By tuning their onboard receiver to the appropriate frequency and identifying the Morse code signal, pilots can confirm that they are receiving signals from the correct ORR station.
The information provided by an omnidirectional radio range system helps pilots maintain accurate situational awareness, especially in low visibility conditions or challenging terrain. It assists with aligning the aircraft with the desired track, maintaining safe altitudes, and establishing a reference point for navigation.
Overall, the omnidirectional radio range is a valuable navigational aid that enhances flight safety and precision by providing pilots with accurate positional information relative to a ground-based radio transmitter.
