Editing Wide Area Augmentation System (section)

===Space segment===
<!-- [[File:WAAS GEO Footprint March 2010.jpg|thumb|right| Current WAAS satellite signal footprint]] This image indicates that WAAS coverage is not available in Canada or southern Mexico, which is inaccurate.  It needs to be changed before it can be put back here. -->The space segment consists of multiple [[artificial satellites|communication satellites]] which broadcast the correction messages generated by the WAAS master stations for reception by the user segment. The satellites also broadcast the same type of range information as normal GPS satellites, effectively increasing the number of satellites available for a position fix. The space segment currently consists of three commercial satellites: ''[[Eutelsat 117 West B]]'', ''[[SES-15]]'', and ''[[Galaxy 30]]''.<ref name="prn-135-resumes">[http://www.gpsworld.com/gnss-system/augmentation-assistance/news/waas-prn-135-resumes-normal-operation-11243 WAAS PRN 135 Resumes Normal Operation] {{webarchive|url=https://web.archive.org/web/20110727142321/http://www.gpsworld.com/gnss-system/augmentation-assistance/news/waas-prn-135-resumes-normal-operation-11243 |date=2011-07-27 }}. March 18, 2011. Accessed November 21, 2011.</ref><ref>{{Cite web|title=SES-15 Enters Commercial Service to Serve the Americas|url=https://www.ses.com/press-release/ses-15-enters-commercial-service-serve-americas|website=SES|date=15 January 2018 |language=en|access-date=2020-05-24}}</ref><ref>{{Cite web|title=FAA Tasks Intelsat with Navigation Satellite WAAS Payload|url=https://www.aviationtoday.com/2018/04/18/faa-tasks-intelsat-navigation-satellite-waas-payload/|date=2018-04-18|website=Avionics|language=en|access-date=2020-05-24}}</ref>

==== Satellite history ====
The original two WAAS satellites, named ''Pacific Ocean Region'' (POR) and ''Atlantic Ocean Region-West'' (AOR-W), were leased space on [[Inmarsat#Inmarsat-3 satellites|Inmarsat III]] satellites. These satellites ceased WAAS transmissions on July 31, 2007. With the end of the Inmarsat lease approaching, two new satellites ([[Galaxy 15]] and [[Anik F1R]]) were launched in late 2005. Galaxy 15 is a [[PanAmSat]] and Anik F1R is a [[Telesat]]. As with the previous satellites, these are leased services under the FAA's Geostationary Satellite Communications Control Segment contract with [[Lockheed Martin]] for WAAS geostationary satellite leased services, who were contracted to provide up to three satellites through the year 2016.<ref>Federal Aviation Administration (FAA) Announcement [http://gps.faa.gov/Library/Data/waas/March_2005.doc March 2005] {{webarchive|url=https://web.archive.org/web/20061208030033/http://gps.faa.gov/Library/Data/waas/March_2005.doc |date=2006-12-08 }}</ref>

A third satellite was later added to the system. From March to November 2010, the FAA broadcast a WAAS test signal on a leased transponder on the Inmarsat-4 F3 satellite.<ref>[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/news/ FAA: New WAAS GEO to Begin Broadcasting in Test Mode in March (2010)]. January 19, 2010. Accessed November 21, 2011.</ref> The test signal was not usable for navigation, but could be received and was reported with the identification numbers PRN 133 (NMEA #46). In November 2010, the signal was certified as operational and made available for navigation.<ref>[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/news/ WAAS Intelsat GEO Satellite Ceases Broadcast]. December 16, 2010. Accessed November 21, 2011.</ref> Following in orbit testing, Eutelsat 117 West B, broadcasting signal on PRN 131 (NMEA #44), was certified as operational and made available for navigation on March 27, 2018. The SES 15 satellite was launched on May 18, 2017, and following an in-orbit test of several months, was set operational on July 15, 2019. In 2018, a contract was awarded to place a WAAS L-band payload on the Galaxy 30 satellite. The satellite was successfully launched on August 15, 2020, and the WAAS transmissions were set operational on April 26, 2022, re-using PRN 135 (NMEA #48).<ref>{{Cite web|url=https://investors.leidos.com/news-and-events/news-releases/press-release-details/2018/Leidos-Awarded-GEO-7-Task-Order-to-Enhance-US-Air-Traffic-System/default.aspx|title=Leidos Awarded GEO 7 Task Order to Enhance U.S. Air Traffic System|website=investors.leidos.com|language=en-US|access-date=2019-03-26}}</ref><ref name=":0">{{Cite web |last=Miller |first=Dan |date=2022-05-14 |title=FAA Shutdown of Geostationary Satellite on Tuesday Could Affect Some GPS Farming Systems |url=https://www.dtnpf.com/agriculture/web/ag/equipment/article/2022/05/14/faa-shutdown-geostationary-satellite |access-date=2022-06-04 |website=DTN Progressive Farmer |language=en-US}}</ref> After approximately three weeks with four active WAAS satellites, operational WAAS transmissions on Anik F1-R were ended on May 17, 2022.<ref name=":0" />

{| class="wikitable"
! Satellite name and details
! PRN
! NMEA
!Designator
! Location
!Active period (not in test mode)
!Status
!Signal capability
|-
|[https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1997-027A Atlantic Ocean Region-West]
|122
|35
|AORW
|54°W, later moved to 142°W<ref>[http://www.tbs-satellite.com/tse/online/sat_inmarsat_3f4.html The Satellite Encyclopedia - Inmarsat 3F4]. Accessed October 28, 2013.</ref>
|July 10, 2003 – July 31, 2017
|''Ceased operational WAAS transmissions on July 31, 2017''
|L1 narrowband
|-
|[https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1996-070A Pacific Ocean Region (POR)]
|134
|47
|POR
|178°E
|July 10, 2003 – July 31, 2017
|''Ceased operational WAAS transmissions on July 31, 2017''
|L1
|-
|[[Galaxy 15]]
|135
|48
|CRW
|133°W
|November 2006 – July 25, 2019
|''Ceased operational WAAS transmissions on July 25, 2019.''
|L1, L5 (test mode)
|-
|[[Anik F1R]]
|138
|51
|CRE
|107.3°W
|July 2007 – May 17, 2022
|''Ceased operational WAAS transmissions on May 17, 2022.''<ref name=":0" />
|L1, L5 (test mode)
|-
|[[Inmarsat-4 F3]]
|133
|46
|AMR
|98°W
|November 2010 – November 9, 2017
|''Ceased operational WAAS transmissions as of November 9, 2017.''<ref>[http://www.nstb.tc.faa.gov/ "NOTICE: GEO PRN 133 (AMR) was removed from the WAAS satellite mask on November 9th, 2017."] Accessed December 4th, 2017.</ref>
|L1 narrowband, L5 (test mode)
|-
|[[Eutelsat 117 West B]]
|131
|44
|SM9
|117°W
|March 2018 – present
|Operational
|L1, L5 (test mode)
|-
|[[SES-15|SES 15]]
|133
|46
|S15
|129°W
|July 15, 2019 – present
|Operational
|L1, L5 (test mode)
|-
|[[Galaxy 30]]
|135
|48
|G30
|125°W
|April 26, 2022 – present
|Operational
|L1, L5 (test mode)
|}
In the table above, PRN is the satellite's actual pseudo-random number code. NMEA is the satellite number sent by some receivers when outputting satellite information (NMEA = PRN - 87).