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List of GPS satellites

As of 15 August 2023, 83 Global Positioning System navigation satellites have been built: 31 are launched and operational, 4 are unhealthy or in reserve, 41 are retired, 2 were lost during launch, and 1 prototype was never launched. 4 Block III satellites have completed construction and have been declared "Available For Launch" (AFL). The next launch is GPS III SV07, scheduled for June 2024.

Samples of three GPS satellites' orbits over a five-year period (2013 to 2018)
  USA-242 ·   USA-239 ·   USA-151 ·   Earth

The constellation requires a minimum of 24 operational satellites, and allows for up to 32; typically, 31 are operational at any one time. A GPS receiver needs four satellites to work out its position in three dimensions.[1]

SVNs are "space vehicle numbers" which are serial numbers assigned to each GPS satellite. PRNs are the "pseudo-random noise" sequences, or Gold codes, that each satellite transmits to differentiate itself from other satellites in the active constellation.

After being launched, GPS satellites enter a period of testing before their signals are set to "Healthy". During normal operations, certain signals may be set to "Unhealthy" to accommodate updates or testing. After decommissioning, most GPS satellites become on-orbit spares and may be recommissioned if needed. Permanently retired satellites are sent to a higher, less congested disposal orbit where their fuel is vented, batteries are intentionally depleted and communication is switched off.[2]

Satellites

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Satellites by launch date

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SatelliteLaunch (UTC)Carrier rocketLaunch siteBlockNo.SVNPRNSlotLOS[note 1]Status
Remarks
OPS 511122 February 1978
23:44		Atlas E/F-SGS-1VAFB, SLC-3EI1[3]01042,703Retired
17 July 1985[4]
OPS 511213 May 1978
10:34		Atlas E/F-SGS-1VAFB, SLC-3EI2[5]02071,161Retired
16 July 1981[4]
OPS 51137 October 1978
00:28		Atlas E/FVAFB, SLC-3EI3[6]03064,973Retired
18 May 1992[4]
OPS 511411 December 1978
03:59		Atlas E/FVAFB, SLC-3EI4[7]04084,046Retired
14 October 1989[4]
Used for testing between February 1990 and May 1990.[4]
OPS 51179 February 1980
23:08		Atlas E/FVAFB, SLC-3EI5[8]05051,389Retired
28 November 1983[4]
OPS 511826 April 1980
22:00		Atlas E/FVAFB, SLC-3EI6[9]06093,967Retired
6 March 1991[4]
N/A
(Navstar 7)		19 December 1981
01:10		Atlas E/FVAFB, SLC-3EI707100N/A[4]
Failed to reach orbit.
OPS 979414 July 1983
10:21		Atlas E/FVAFB, SLC-3WI8[10]08113,583Retired
4 May 1993[4]
USA-113 June 1984
11:37		Atlas E/FVAFB, SLC-3WI9[11]09133,660Retired
20 June 1994[4]
Used for testing between February 1994 and June 1994.[4]
USA-58 September 1984
21:41		Atlas E/FVAFB, SLC-3WI10[12]10124,089Retired
15 March 1996[4]
Used for testing between November 1995 and March 1996.[4]
USA-109 October 1985
02:53		Atlas E/FVAFB, SLC-3WI11[13]11033,109Retired
13 April 1994[4]
N/A
(Prototype)		II0120N/A
Qualification vehicle built by Rockwell International to secure Block II contract; never launched.
USA-3514 February 1989
18:30		Delta II 6925-9.5CCAFS, LC-17A[14]II1[15]14144,059Retired
26 March 2000[16][17]
USA-3810 June 1989
22:30		Delta II 6925-9.5CCAFS, LC-17A[14]II2[18]1302B35,371Retired
22 February 2004[17]
USA-4218 August 1989
05:58		Delta II 6925-9.5CCAFS, LC-17A[14]II3[19]16164,075Retired
13 October 2000[17]
USA-4721 October 1989
09:31		Delta II 6925-9.5CCAFS, LC-17A[14]II4[20]1919A54,165Retired
16 March 2001[17]
USA-4911 December 1989
18:10		Delta II 6925-9.5CCAFS, LC-17B[14]II5[21]1717D35,554Retired
23 February 2005[17]
USA-5024 January 1990
22:55		Delta II 6925-9.5CCAFS, LC-17A[14]II6[22]18183,860Retired
18 August 2000[17]
USA-5426 March 1990
02:45		Delta II 6925-9.5CCAFS, LC-17A[14]II7[23]20202,249Retired
21 May 1996[17]
Decommissioned after twice changing frequency without being commanded to.
USA-632 August 1990
05:39		Delta II 6925-9.5CCAFS, LC-17A[14]II8[24]2121E24,438Retired
25 September 2002[17]
USA-641 October 1990
21:56		Delta II 6925-9.5CCAFS, LC-17A[14]II9[25]1515D56,009Retired
17 November 2006[17]
Used for testing from November 2006 until March 2007[17]
USA-6626 November 1990
21:39		Delta II 7925-9.5CCAFS, LC-17AIIA1[26]2323
32		E57,720Retired
25 January 2016[27]
Decommissioned from active service using PRN23 on 13 February 2004. Set usable with PRN32 on 26 February 2008.[17]
USA-714 July 1991
02:32		Delta II 7925-9.5CCAFS, LC-17AIIA2[28]2424D17,394Retired
30 September 2011[29]
USA-7923 February 1992
22:29		Delta II 7925-9.5CCAFS, LC-17BIIA3[30]2525A26,509Retired
18 December 2009
USA-8010 April 1992
03:20		Delta II 7925-9.5CCAFS, LC-17BIIA4[31]2828C21,954Retired
15 August 1997[17]
Retired early, replaced by USA-117.
USA-837 July 1992
09:20		Delta II 7925-9.5CCAFS, LC-17BIIA5[32]2626F58,219Retired
6 January 2015[33]
USA-849 September 1992
08:57		Delta II 7925-9.5CCAFS, LC-17AIIA6[34]2727A66,910Retired
10 August 2011[35]
[36]
USA-8522 November 1992
23:54		Delta II 7925-9.5CCAFS, LC-17AIIA7[37]3231
01
30
NA		F45,595Retired
17 March 2008[35]
PRN changed from 32 to 01 in January 1993 due to receiver problems. Decommissioned 17 March 2008 and removed from slot F4. Briefly resumed L-band transmission in 2014 but signal unusable.[17][35]
USA-8718 December 1992
22:16		Delta II 7925-9.5CCAFS, LC-17BIIA8[38]2929F55,423Retired
23 October 2007[39]
USA-883 February 1993
02:55		Delta II 7925-9.5CCAFS, LC-17AIIA9[40]2222B13,591Retired
3 December 2002[17]
USA-9030 March 1993
03:09		Delta II 7925-9.5CCAFS, LC-17AIIA10[41]3131C34,592Retired
24 October 2005
USA-9113 May 1993
00:07		Delta II 7925-9.5CCAFS, LC-17AIIA11[42]3707
01
24		C48,346Retired
18 March 2016[43]
Switched to PRN01 in October 2008 but was unusable.[17] Switched to PRN24 in April 2012 but was unusable.[44]
USA-9226 June 1993
13:27		Delta II 7925-9.5CCAFS, LC-17AIIA12[45]3909A57,633Retired
19 May 2014[35]
First satellite to complete initial operational 24-satellite constellation.
USA-9430 August 1993
12:38		Delta II 7925-9.5CCAFS, LC-17BIIA13[46]3505
30		B56,313Retired
1 May 2013[17]
Decommissioned from active service using PRN05 in March 2009. Resumed activity using PRN30 in August 2011.[17]
USA-9626 October 1993
17:04		Delta II 7925-9.5CCAFS, LC-17BIIA14[47]3404
18		D68,612Retired
9 October 2019[48][49]
Decommissioned from active service using PRN04 in November 2015.[50] Reactivated in March 2018 using PRN18.[51] Decommissioned from active service using PRN18 in October 2019.[52]
USA-10010 March 1994
03:40		Delta II 7925-9.5CCAFS, LC-17AIIA15[53]3606
04[54]		C67,289Retired
21 February 2014[35][36]
USA-11728 March 1996
00:21		Delta II 7925-9.5CCAFS, LC-17BIIA16[55]3303C56,702Retired
2 August 2014[56]
USA-12616 July 1996
00:50		Delta II 7925-9.5CCAFS, LC-17AIIA17[57]4010E67,179Retired
11 March 2016[58]
USA-12812 September 1996
08:49		Delta II 7925-9.5CCAFS, LC-17AIIA18[59]3030B25,425Retired
20 July 2011[35]
GPS IIR-117 January 1997
16:28		Delta II 7925-9.5CCAFS, LC-17AIIR142120N/A[35]
Failed to reach orbit.
USA-13223 July 1997
03:43		Delta II 7925-9.5[60]CCAFS, LC-17AIIR24313F69,824Operational[35]
Longest-serving satellite in GPS history.
USA-1356 November 1997
00:30		Delta II 7925-9.5CCAFS, LC-17AIIA19[61]3808A38,008Retired
9 October 2019[62]
USA-1457 October 1999
12:51		Delta II 7925-9.5[63]CCAFS, SLC-17AIIR34611D57,706On orbit spare
10 November 2020[35][64]
USA-15011 May 2000
01:48		Delta II 7925-9.5[65]CCAFS, SLC-17AIIR45120E48,801Operational[35]
USA-15116 July 2000
09:17		Delta II 7925-9.5[66]CCAFS, SLC-17AIIR54428
22		B38,735Operational[67][68][69]
USA-15410 November 2000
17:14		Delta II 7925-9.5[70]CCAFS, SLC-17AIIR64114
22
F57,918Retired
25 January 2023[71]
Retired 9 July 2020. Subsequently reactivated on 20 January 2022 and decommissioned again on 25 January 2023.
USA-15630 January 2001
07:55		Delta II 7925-9.5[72]CCAFS, SLC-17AIIR75418E46,244On orbit spare
5 March 2018[73][74]
USA-16629 January 2003
18:06		Delta II 7925-9.5[75]CCAFS, SLC-17BIIR85616B17,808Operational[35]
USA-16831 March 2003
22:09		Delta II 7925-9.5[76]CCAFS, SLC-17AIIR94521D37,747Operational[35]
USA-17521 December 2003
08:05		Delta II 7925-9.5[77]CCAFS, SLC-17AIIR104722E66,604Retired
18 January 2022[78]
USA-17720 March 2004
17:53		Delta II 7925-9.5[79]CCAFS, SLC-17BIIR115919C57,392Operational[35]
USA-17823 June 2004
22:54		Delta II 7925-9.5[80]CCAFS, SLC-17BIIR126023F45,732Retired
2 March 2020[81][35]
USA-1806 November 2004
05:39		Delta II 7925-9.5[82]CCAFS, SLC-17BIIR136102D17,161Operational[35]
USA-18326 September 2005
03:37		Delta II 7925-9.5[83]CCAFS, SLC-17AIIRM15317C46,837Operational[35]
Also known as IIR-14; first to broadcast L2C signal.
USA-19025 September 2006
18:50		Delta II 7925-9.5[84]CCAFS, SLC-17AIIRM25231A26,473Operational[35]
Also known as IIR-15.
USA-19217 November 2006
19:12		Delta II 7925-9.5[85]CCAFS, SLC-17AIIRM35812B46,420Operational[35]
Also known as IIR-16; first satellite to complete the full operational 31-satellite constellation.
USA-19617 October 2007
12:23		Delta II 7925-9.5[86]CCAFS, SLC-17AIIRM45515F26,086Operational[35]
Also known as IIR-17.
USA-19920 December 2007
20:04		Delta II 7925-9.5[87]CCAFS, SLC-17AIIRM55729C16,022Operational[35]
Also known as IIR-18.
USA-20115 March 2008
06:10		Delta II 7925-9.5[88]CCAFS, SLC-17AIIRM64807A45,936Operational[35]
Also known as IIR-19.
USA-20324 March 2009
08:34		Delta II 7925-9.5[89]CCAFS, SLC-17AIIRM74901
27
30
06
NA		B6814In Reserve
Also known as IIR-20; broadcasts demonstration L5 signal. Never entered service due to poor quality signal; decommissioned on 6 May 2011 but subsequently reactivated for testing. Broadcast PRN-01 before decommissioning, PRN-27 after reactivation. Shifted to PRN-30 as of 8 May 2013 and to PRN-06 as of 3 April 2014. Currently not assigned a PRN.[35]
USA-20617 August 2009
10:35		Delta II 7925-9.5CCAFS, SLC-17AIIRM85005E35,416Operational[35]
Originally scheduled for launch in 1999 as IIR-3 but damaged during processing.[90] Also known as IIR-21; L5 services disconnected from J2 port before launch. Final Delta II launch with a United States Air Force payload,[91] final launch from SLC-17A, and final Delta II 7925.
USA-21328 May 2010
03:00		Delta IV M+ (4,2)CCAFS, SLC-37BIIF16225B25,132Operational[35]
First to broadcast operational L5 signal.
USA-23216 July 2011
06:41		Delta IV M+(4,2)CCAFS, SLC-37BIIF26301D24,409Retired
10 August 2023[92][93]
USA-2394 October 2012
12:10		Delta IV M+(4,2)CCAFS, SLC-37BIIF36524A14,272Operational[35]
USA-24215 May 2013
21:38		Atlas V 401CCAFS, SLC-41IIF46627C24,049Operational[35]
USA-24821 February 2014
01:59		Delta IV M+ (4,2)CCAFS, SLC-37BIIF56430A33,767Operational[35]
USA-25117 May 2014
00:03		Delta IV M+ (4,2)CCAFS, SLC-37BIIF66706D43,682Operational[35]
USA-2562 August 2014
03:23		Atlas V 401CCAFS, SLC-41IIF76809F33,605Operational[35]
USA-25829 October 2014
17:21		Atlas V 401CCAFS, SLC-41IIF86903E13,517Operational[35]
USA-26025 March 2015
18:36		Delta IV M+ (4,2)CCAFS, SLC-37BIIF97126B53,370Operational[35]
USA-26215 July 2015
15:36		Atlas V 401CCAFS, SLC-41IIF107208C33,258Operational[35]
USA-26531 October 2015
16:13		Atlas V 401CCAFS, SLC-41IIF117310E23,150Operational[94]
USA-2665 February 2016
13:38		Atlas V 401CCAFS, SLC-41IIF127032F13,053Operational [95]
USA-289
Vespucci[96]		23 December 2018
13:51		Falcon 9 Block 5CCAFS, SLC-40III17404F42,001Operational [97]
USA-293
Magellan		22 August 2019
13:06		Delta IV M+ (4,2)CCAFS, SLC-37BIII27518D61,759Operational [98]
USA-304
Matthew Henson		30 June 2020
20:10:46		Falcon 9 Block 5CCAFS, SLC-40III37623E51,446Operational[99]
Initially nicknamed Columbus.[100][101]
USA-309
Sacagawea		5 November 2020
23:24:23		Falcon 9 Block 5CCAFS, SLC-40III47714B61,318Operational[102]
USA-319
Neil Armstrong		17 June 2021 16:09[103]Falcon 9 Block 5[104]CCAFS, SLC-40[105]III57811D51,094Operational[106]
USA-343
Amelia Earhart		18 January 2023 12:24Falcon 9 Block 5CCAFS, SLC-40III67928A6514Operational[107]
  1. ^ Length Of Service in days. Includes testing period(s).

Satellites by block

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Further information: GPS satellite blocks
BlockLaunchedOperationalTesting/
Reserve		Unhealthy/
Spare		RetiredLaunch
Failures		ManufacturerRemarks
Block I11000101Rockwell International
Block II900090Rockwell InternationalOne unlaunched prototype
Block IIA19000190Rockwell International
Block IIR1370231Lockheed Martin
Block IIRM870100Lockheed Martin
Block IIF12110010Boeing
Block III660000Lockheed Martin
Block IIIF000000Lockheed Martin
Total783103422

Orbital slots (by SVN)

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Refer to GPS Constellation Status for the most up-to-date information.

As of 10 August 2023
SlotPlane
ABCDEF
1655657616970
25262667355
3644472455068
4485853675174
571597876
679777543
BlockIIRIIRMIIFIII

Numbers in parentheses refer to non-operational satellites.

Once launched, GPS satellites do not change their plane assignment but slot assignments are somewhat arbitrary and are subject to change.

PRN status by satellite block

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As of 23 August 2023, 31 of 32 PRNs are in use; PRN 01 is unassigned. Two additional satellites are designated as on-orbit spares.

PRN0102030405060708091011121314151617181920212223242526272829303132--
IIROSOOSOOOO
IIRMOOOOOOOS
IIFROOOOOOOOOOO
IIIOOOOOO
Legend:
  • O – Operational
  • T – Testing in preparation for operation
  • S – On orbit Spare
  • U – Unhealthy and unusable
  • R – Retired

PRN to SVN history

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This section is for the purpose of making it possible to determine the PRN associated with a SVN at a particular epoch. For example, SVN 049 had been assigned PRNs 01, 24, 27, and 30 at different times of its lifespan, whereas PRN 01 had been assigned to SVNs 032, 037, 049, 035, and 063 at different epochs. This information can be found in the IGS ANTEX file[permanent dead link], which uses the convention "GNN" and "GNNN" for PRNs and SVNs, respectively. For example, SVN 049 is described as:

BLOCK IIR-M         G01                 G049      2009-014A TYPE / SERIAL NO      2009     3    24     0     0    0.0000000                 VALID FROM            2011     5     6    23    59   59.9999999                 VALID UNTIL         BLOCK IIR-M         G24                 G049      2009-014A TYPE / SERIAL NO      2012     2     2     0     0    0.0000000                 VALID FROM            2012     3    14    23    59   59.9999999                 VALID UNTIL         BLOCK IIR-M         G24                 G049      2009-014A TYPE / SERIAL NO      2012     8     9     0     0    0.0000000                 VALID FROM            2012     8    22    23    59   59.9999999                 VALID UNTIL         BLOCK IIR-M         G27                 G049      2009-014A TYPE / SERIAL NO      2012    10    18     0     0    0.0000000                 VALID FROM            2013     5     9    23    59   59.9999999                 VALID UNTIL         BLOCK IIR-M         G30                 G049      2009-014A TYPE / SERIAL NO      2013     5    10     0     0    0.0000000                 VALID FROM

whereas for PRN 01 the following excerpt is relevant:

BLOCK IIA           G01                 G032      1992-079A TYPE / SERIAL NO      1992    11    22     0     0    0.0000000                 VALID FROM            2008    10    16    23    59   59.9999999                 VALID UNTIL         BLOCK IIA           G01                 G037      1993-032A TYPE / SERIAL NO      2008    10    23     0     0    0.0000000                 VALID FROM            2009     1     6    23    59   59.9999999                 VALID UNTIL         BLOCK IIR-M         G01                 G049      2009-014A TYPE / SERIAL NO      2009     3    24     0     0    0.0000000                 VALID FROM            2011     5     6    23    59   59.9999999                 VALID UNTIL         BLOCK IIA           G01                 G035      1993-054A TYPE / SERIAL NO      2011     6     2     0     0    0.0000000                 VALID FROM            2011     7    12    23    59   59.9999999                 VALID UNTIL         BLOCK IIF           G01                 G063      2011-036A TYPE / SERIAL NO      2011     7    16     0     0    0.0000000                 VALID FROM

A table extracted out of the ANTEX file is made available by the Bernese GNSS Software.

Planned launches

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Block III

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Main article: GPS Block III
DateRocketLaunch siteSatelliteSVNRemarks
June 2024[108][109]Vulcan CentaurCCSFS SLC-41GPS III SV07 Sally Ride80Space vehicle manufacturing contract awarded February 2013.[110] It was in assembly in December 2018.[111]

Declared "Available for Launch" on 20 May 2021.[112][113]

Feb 2025[114][115][116]Vulcan CentaurCCSFS SLC-41GPS III SV08 Katherine Johnson81Space vehicle manufacturing contract awarded February 2013.[110] The satellite was named "Katherine Johnson" in June 2020 following its successful core mate assembly.[117]

Declared "Available for Launch" on 10 June 2021.[112]

End of 2025[118]Vulcan CentaurCCSFS SLC-41GPS III SV09 Ellison Onizuka82Space vehicle manufacturing contract awarded September 2016.[119]

Declared "Available for Launch" on 23 Aug 2022.[118]

2026[120]Falcon 9 Block 5CCSFS, SLC-40GPS III SV10 Hedy Lamarr83Space vehicle manufacturing contract awarded September 2016.[119] Component build up stage as of June 2021.[121] Component deliveries continuing through May 2022.[122]

Declared "Available for Launch" on 08 Dec 2022.[123]

Block IIIF

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Main article: GPS Block IIIF
Projected Available For Launch (AFL) DateRocketLaunch siteSatelliteSVNRemarks
Feb 2026[124][125]Falcon HeavyKSC, LC-39AGPS IIIF SV11Construction contract awarded in September 2018. In production.
Aug 2026[126]GPS IIIF SV12In production.
Sep 2026[127]GPS IIIF SV13
April 2027[128]GPS IIIF SV14
Oct 2027[128]GPS IIIF SV15
Feb 2028[128]GPS IIIF SV16
June 2028[128]GPS IIIF SV17Technology Insertion Point
Oct 2028[128]GPS IIIF SV18
Feb 2029[128]GPS IIIF SV19
June 2029[128]GPS IIIF SV20
FY2029[129]GPS IIIF SV21
GPS IIIF SV22
FY2030[129]GPS IIIF SV23Technology Insertion Point
GPS IIIF SV24
FY2031[129]GPS IIIF SV25
GPS IIIF SV26
FY2032[129]GPS IIIF SV27
GPS IIIF SV28
FY2033[129]GPS IIIF SV29Technology Insertion Point
GPS IIIF SV30
FY2034[129]GPS IIIF SV31
GPS IIIF SV32

See also

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References

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  1. ^ US Government. "GPS.gov". gps.gov. U.S. Government. Retrieved 21 March 2015. This article incorporates text from this source, which is in the public domain.
  2. ^ "2 SOPS disposes last GPS IIA satellite after 26 years". GPS World. 17 April 2020. Retrieved 7 July 2021.
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  32. ^ "Navstar IIA-05". NASA. Retrieved 25 April 2013. This article incorporates text from this source, which is in the public domain.
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  42. ^ "Navstar IIA-11". NASA. Retrieved 25 April 2013. This article incorporates text from this source, which is in the public domain.
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  46. ^ "Navstar IIA-13". NASA. Retrieved 25 April 2013. This article incorporates text from this source, which is in the public domain.
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  55. ^ "Navstar IIA-16". NASA. Retrieved 25 April 2013. This article incorporates text from this source, which is in the public domain.
  56. ^ "NANU 2014-063". Retrieved 28 June 2015.
  57. ^ "Navstar IIA-17". NASA. Retrieved 25 April 2013. This article incorporates text from this source, which is in the public domain.
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  60. ^ "Navstar 43". NASA. Retrieved 26 April 2013. This article incorporates text from this source, which is in the public domain.
  61. ^ "Navstar 38". NASA. Retrieved 26 April 2013. This article incorporates text from this source, which is in the public domain.
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  64. ^ "CelesTrak Orbit Visualization".
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  77. ^ "Navstar 53". NASA. Retrieved 26 April 2013. This article incorporates text from this source, which is in the public domain.
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  79. ^ "Navstar 54". NASA. Retrieved 26 April 2013. This article incorporates text from this source, which is in the public domain.
  80. ^ "Navstar 55". NASA. Retrieved 26 April 2013. This article incorporates text from this source, which is in the public domain.
  81. ^ "GPS constellation changes with addition of second GPS III satellite". 2 April 2020.
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  83. ^ "Navstar 57". NASA. Retrieved 26 April 2013. This article incorporates text from this source, which is in the public domain.
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  85. ^ "Navstar 59". NASA. Retrieved 26 April 2013. This article incorporates text from this source, which is in the public domain.
  86. ^ "GPS 2R-17". NASA. Retrieved 26 April 2013. This article incorporates text from this source, which is in the public domain.
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  88. ^ "Navstar 62". NASA. Retrieved 26 April 2013. This article incorporates text from this source, which is in the public domain.
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  92. ^ "NANU 2023-004". Retrieved 12 November 2023. This article incorporates text from this source, which is in the public domain.
  93. ^ "CGSIC Bulletin: GPS Constellation Change: SVN-63". 10 August 2023.
  94. ^ "NANU 2015-093". Retrieved 10 December 2015. This article incorporates text from this source, which is in the public domain.
  95. ^ "NANU 2016-011". Retrieved 9 March 2016. This article incorporates text from this source, which is in the public domain.
  96. ^ Clark, Stephen (23 December 2018). "SpaceX closes out year with successful GPS satellite launch". Spaceflight Now. Retrieved 24 December 2018.
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  98. ^ "NANU 2020-015". Retrieved 2 April 2020. This article incorporates text from this source, which is in the public domain.
  99. ^ "NANU 2020-046". USCG Navigation Center. Retrieved 23 November 2020.
  100. ^ Clark, Stephen (2 October 2020). "Space Force announces new nicknames for GPS satellites". Spaceflight Now. Retrieved 2 October 2020.
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  111. ^ Whitney, Steve (5 December 2018). "GPS Enterprise Status and Modernization" (PDF). U.S. Air Force Space and Missile Systems Center Public Affairs Office. Retrieved 22 December 2018. This article incorporates text from this source, which is in the public domain.
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  113. ^ "Fifth GPS III Satellite Takes to the Skies". Lockheed Martin. Retrieved 16 June 2021. Lockheed Martin's sixth, seventh and eighth GPS III satellites are already complete, "Available for Launch" and just waiting for launch date arrangements.
  114. ^ "GPS MODERNIZATION: Space Force Should Reassess Requirements for Satellites and Handheld Devices" (PDF). 5 June 2023. Space Force is projected to launch the 27th M-code capable GPS satellite in February 2025.
  115. ^ "Department of Defense Fiscal Year (FY) 2024 Budget Estimates" (PDF). March 2023.
  116. ^ "Space Force assigns 12 national security missions to SpaceX and ULA". 8 June 2023.
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  120. ^ Dunn, Michael (6 March 2023). "Directions 2023: Advancing GPS to Meet the Future". GPSWorld.com. Retrieved 21 March 2023.
  121. ^ "SpaceX launches GPS satellite to provide PNT services". GPS World. 18 June 2021. Retrieved 18 June 2021.
  122. ^ Dunn, Michael (2 May 2022). "Directions 2022: GPS positioned for the future". GPSWorld.com. Retrieved 21 January 2023.
  123. ^ "Sixth GPS III Satellite Built By Lockheed Martin Launches As Part Of Constellation Modernization". Lockheed Martin. 18 January 2023. Retrieved 31 January 2023.
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