Editing VHF omnidirectional range (section)

===Future===
[[Image:Table Rock VOR.jpg|thumb|right|VORTAC located on [[Upper and Lower Table Rock|Upper Table Rock]] in [[Jackson County, Oregon|Jackson County]], [[Oregon]]]]
{{update section|date=December 2020}}
{{As of|2008}}, space-based [[Global Navigation Satellite System]]s (GNSS) such as the Global Positioning System ([[GPS]]) are increasingly replacing VOR and other ground-based systems.<ref>{{cite web | author=Department of Defense, Department of Homeland Security and Department of Transportation | date=January 2009 | url=http://www.navcen.uscg.gov/pdf/frp/frp2008/2008_Federal_Radionavigation_Plan.pdf | title=2008 Federal Radionavigation Plan | access-date=June 10, 2009 | archive-date=January 26, 2017 | archive-url=https://web.archive.org/web/20170126142016/http://www.navcen.uscg.gov/pdf/frp/frp2008/2008_Federal_Radionavigation_Plan.pdf | url-status=live }}</ref> In 2016, GNSS was mandated as the primary needs of navigation for IFR aircraft in Australia.<ref name="Australian Aviation"/>

GNSS systems have a lower transmitter cost per customer and provide distance and altitude data. Future satellite navigation systems, such as the [[Galileo (satellite navigation)|European Union Galileo]], and GPS [[Local Area Augmentation System|augmentation]] systems are developing techniques to eventually equal or exceed VOR accuracy. However, low VOR receiver cost, broad installed base and commonality of receiver equipment with [[Instrument landing system|ILS]] are likely to extend VOR dominance in aircraft until space receiver cost falls to a comparable level. As of 2008 in the United States, GPS-based approaches outnumbered VOR-based approaches but VOR-equipped IFR aircraft outnumber GPS-equipped IFR aircraft.{{Citation needed|date=January 2011}}

There is some concern that [[GNSS]] navigation is subject to interference or sabotage, leading in many countries to the retention of VOR stations for use as a backup.{{citation needed|date=September 2021}} The VOR signal has the advantage of static mapping to local terrain.{{clarify|date=September 2021}}

The US FAA plans<ref>{{Cite web |url=https://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/mobileAll/VOR_MON.pdf |archive-url=https://web.archive.org/web/20141006132148/http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/mobileAll/VOR_MON.pdf |archive-date=2014-10-06 |url-status=dead |title=VOR Minimum Operational Network Information Paper |author=[[FAA]]}}</ref> by 2020 to decommission roughly half of the 967<ref name="SatNav 2012">{{Cite magazine |url=https://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/library/satnav/media/SatNavNews_Winter2012.pdf |title=SatNav News  |access-date=2019-09-19 |archive-date=2020-10-19 |archive-url=https://web.archive.org/web/20201019150252/https://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/library/satnav/media/SatNavNews_Winter2012.pdf |volume=42 |url-status=dead }}</ref> VOR stations in the US, retaining a "Minimum Operational Network" to provide coverage to all aircraft more than 5,000 feet above the ground. Most of the decommissioned stations will be east of the [[Rocky Mountains]], where there is more overlap in coverage between them.{{citation needed|date=December 2015}} On July 27, 2016, a final policy statement was released<ref>{{cite web|url=https://www.federalregister.gov/documents/2016/07/26/2016-17579/provision-of-navigation-services-for-the-next-generation-air-transportation-system-nextgen|title=Provision of Navigation Services for the Next Generation Air Transportation System (NextGen) Transition to Performance-Based Navigation (PBN) (Plan for Establishing a VOR Minimum Operational Network)|date=26 July 2016|access-date=29 December 2016|archive-date=29 December 2016|archive-url=https://web.archive.org/web/20161229100815/https://www.federalregister.gov/documents/2016/07/26/2016-17579/provision-of-navigation-services-for-the-next-generation-air-transportation-system-nextgen|url-status=live}}</ref> specifying stations to be decommissioned by 2025. A total of 74 stations are to be decommissioned in Phase 1 (2016–2020), and 234 more stations are scheduled to be taken out of service in Phase 2 (2021–2025).

In the UK, 19 VOR transmitters are to be kept operational until at least 2020. Those at Cranfield and Dean Cross were decommissioned in 2014, with the remaining 25 to be assessed between 2015 and 2020.<ref>{{cite letter|url=http://www.caa.co.uk/docs/7/20090813NATMACConsultativeVOR.pdf|title=RATIONALISATION OF THE UNITED KINGDOM'S VOR GROUND-BASED INFRASTRUCTURE |recipient=All NATMAC Representatives|author=[[Civil Aviation Authority (United Kingdom)|CAA]] ||access-date=2014-10-01|archive-date=2014-10-06|archive-url=https://web.archive.org/web/20141006104448/http://www.caa.co.uk/docs/7/20090813NATMACConsultativeVOR.pdf|url-status=dead}}</ref><ref>{{cite book | publisher=CAA | title=Clued Up, Autumn/Winter 2014}}</ref> Similar efforts are underway in Australia,<ref>{{cite web|url=http://www.casa.gov.au/scripts/nc.dll?WCMS:STANDARD::pc=PC_101178|title=CNS-ATM Navigation frequently asked questions|first=Industry|last=permissions|date=15 November 2012|website=www.casa.gov.au|access-date=1 October 2014|archive-date=19 August 2014|archive-url=https://web.archive.org/web/20140819040014/http://casa.gov.au/scripts/nc.dll?WCMS:STANDARD::pc=PC_101178|url-status=dead}}</ref> and elsewhere.

In the UK and the United States, DME transmitters are planned to be retained in the near future even after co-located VORs are decommissioned.<ref name="NATS" /><ref name="2017 Federal Radionavigation Plan"/> However, there are long-term plans to decommission DME, TACAN and NDBs.