Editing VHF omnidirectional range (section)

===Features===
VOR signals provide considerably greater accuracy and reliability than NDBs due to a combination of factors. Most significant is that VOR provides a bearing from the station to the aircraft which does not vary with wind or orientation of the aircraft. VHF radio is less vulnerable to diffraction (course bending) around terrain features and coastlines. Phase encoding suffers less interference from thunderstorms.

VOR signals offer a predictable accuracy of {{convert|90|m|ft|abbr=on}}, 2 sigma at 2&nbsp;NM from a pair of VOR beacons;<ref name="FRS2001">{{cite web | author=Department of Transportation and Department of Defense | date=March 25, 2002 | url=http://www.navcen.uscg.gov/pdf/frp/frp2001/FRS2001.pdf | title=2001 Federal Radionavigation Systems | access-date=November 27, 2005 | archive-date=June 14, 2011 | archive-url=https://web.archive.org/web/20110614015708/http://www.navcen.uscg.gov/pdf/frp/frp2001/FRS2001.pdf | url-status=dead }}</ref> as compared to the accuracy of unaugumented [[GPS|Global Positioning System]] (GPS) which is less than 13 meters, 95%.<ref name="FRS2001"/>

VOR stations, being VHF, operate on "line of sight". This means that if, on a perfectly clear day, you cannot see the transmitter from the receiver antenna, or vice versa, the signal will be either imperceptible or unusable. This limits VOR (and [[Distance Measuring Equipment|DME]]) range to the horizon—or closer if mountains intervene. Although the modern solid state transmitting equipment requires much less maintenance than the older units, an extensive network of stations, needed to provide reasonable coverage along main air routes, is a significant cost in operating current airway systems.

Typically, a VOR station's identifier represents a nearby town, city or airport. For example, the VOR station located on the grounds of [[John F. Kennedy International Airport]] has the identifier JFK.