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List of GPS satellites

From Wikipedia, the free encyclopedia

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

As of 15 August 2023,83Global Positioning Systemnavigation satelliteshave 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.

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, orGold 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[edit]

Satellites by launch date[edit]

Satellite Launch (UTC) Carrier rocket Launch site Block No. SVN PRN Slot LOS[note 1] Status
Remarks
OPS 5111 22 February 1978
23:44 		Atlas E/F-SGS-1 VAFB,SLC-3E I 1[3] 01 04 2,703 Retired
17 July 1985[4]
OPS 5112 13 May 1978
10:34 		Atlas E/F-SGS-1 VAFB,SLC-3E I 2[5] 02 07 1,161 Retired
16 July 1981[4]
OPS 5113 7 October 1978
00:28 		Atlas E/F VAFB,SLC-3E I 3[6] 03 06 4,973 Retired
18 May 1992[4]
OPS 5114 11 December 1978
03:59 		Atlas E/F VAFB,SLC-3E I 4[7] 04 08 4,046 Retired
14 October 1989[4]
Used for testing between February 1990 and May 1990.[4]
OPS 5117 9 February 1980
23:08 		Atlas E/F VAFB,SLC-3E I 5[8] 05 05 1,389 Retired
28 November 1983[4]
OPS 5118 26 April 1980
22:00 		Atlas E/F VAFB,SLC-3E I 6[9] 06 09 3,967 Retired
6 March 1991[4]
N/A
(Navstar 7) 		19 December 1981
01:10 		Atlas E/F VAFB,SLC-3E I 7 07 10 0 N/A[4]
Failed to reach orbit.
OPS 9794 14 July 1983
10:21 		Atlas E/F VAFB,SLC-3W I 8[10] 08 11 3,583 Retired
4 May 1993[4]
USA-1 13 June 1984
11:37 		Atlas E/F VAFB,SLC-3W I 9[11] 09 13 3,660 Retired
20 June 1994[4]
Used for testing between February 1994 and June 1994.[4]
USA-5 8 September 1984
21:41 		Atlas E/F VAFB,SLC-3W I 10[12] 10 12 4,089 Retired
15 March 1996[4]
Used for testing between November 1995 and March 1996.[4]
USA-10 9 October 1985
02:53 		Atlas E/F VAFB,SLC-3W I 11[13] 11 03 3,109 Retired
13 April 1994[4]
N/A
(Prototype) 		II 0 12 0 N/A
Qualification vehicle built byRockwell Internationalto secure Block II contract; never launched.
USA-35 14 February 1989
18:30 		Delta II6925-9.5 CCAFS,LC-17A[14] II 1[15] 14 14 4,059 Retired
26 March 2000[16][17]
USA-38 10 June 1989
22:30 		Delta II6925-9.5 CCAFS,LC-17A[14] II 2[18] 13 02 B3 5,371 Retired
22 February 2004[17]
USA-42 18 August 1989
05:58 		Delta II6925-9.5 CCAFS,LC-17A[14] II 3[19] 16 16 4,075 Retired
13 October 2000[17]
USA-47 21 October 1989
09:31 		Delta II6925-9.5 CCAFS,LC-17A[14] II 4[20] 19 19 A5 4,165 Retired
16 March 2001[17]
USA-49 11 December 1989
18:10 		Delta II6925-9.5 CCAFS,LC-17B[14] II 5[21] 17 17 D3 5,554 Retired
23 February 2005[17]
USA-50 24 January 1990
22:55 		Delta II6925-9.5 CCAFS,LC-17A[14] II 6[22] 18 18 3,860 Retired
18 August 2000[17]
USA-54 26 March 1990
02:45 		Delta II6925-9.5 CCAFS,LC-17A[14] II 7[23] 20 20 2,249 Retired
21 May 1996[17]
Decommissioned after twice changing frequency without being commanded to.
USA-63 2 August 1990
05:39 		Delta II6925-9.5 CCAFS,LC-17A[14] II 8[24] 21 21 E2 4,438 Retired
25 September 2002[17]
USA-64 1 October 1990
21:56 		Delta II6925-9.5 CCAFS,LC-17A[14] II 9[25] 15 15 D5 6,009 Retired
17 November 2006[17]
Used for testing from November 2006 until March 2007[17]
USA-66 26 November 1990
21:39 		Delta II7925-9.5 CCAFS,LC-17A IIA 1[26] 23 23
32 		E5 7,720 Retired
25 January 2016[27]
Decommissioned from active service using PRN23 on 13 February 2004. Set usable with PRN32 on 26 February 2008.[17]
USA-71 4 July 1991
02:32 		Delta II7925-9.5 CCAFS,LC-17A IIA 2[28] 24 24 D1 7,394 Retired
30 September 2011[29]
USA-79 23 February 1992
22:29 		Delta II7925-9.5 CCAFS,LC-17B IIA 3[30] 25 25 A2 6,509 Retired
18 December 2009
USA-80 10 April 1992
03:20 		Delta II7925-9.5 CCAFS,LC-17B IIA 4[31] 28 28 C2 1,954 Retired
15 August 1997[17]
Retired early, replaced byUSA-117.
USA-83 7 July 1992
09:20 		Delta II7925-9.5 CCAFS,LC-17B IIA 5[32] 26 26 F5 8,219 Retired
6 January 2015[33]
USA-84 9 September 1992
08:57 		Delta II7925-9.5 CCAFS,LC-17A IIA 6[34] 27 27 A6 6,910 Retired
10 August 2011[35]
[36]
USA-85 22 November 1992
23:54 		Delta II7925-9.5 CCAFS,LC-17A IIA 7[37] 32 31
01
30
NA 		F4 5,595 Retired
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 resumedL-bandtransmission in 2014 but signal unusable.[17][35]
USA-87 18 December 1992
22:16 		Delta II7925-9.5 CCAFS,LC-17B IIA 8[38] 29 29 F5 5,423 Retired
23 October 2007[39]
USA-88 3 February 1993
02:55 		Delta II7925-9.5 CCAFS,LC-17A IIA 9[40] 22 22 B1 3,591 Retired
3 December 2002[17]
USA-90 30 March 1993
03:09 		Delta II7925-9.5 CCAFS,LC-17A IIA 10[41] 31 31 C3 4,592 Retired
24 October 2005
USA-91 13 May 1993
00:07 		Delta II7925-9.5 CCAFS,LC-17A IIA 11[42] 37 07
01
24 		C4 8,346 Retired
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-92 26 June 1993
13:27 		Delta II7925-9.5 CCAFS,LC-17A IIA 12[45] 39 09 A5 7,633 Retired
19 May 2014[35]
First satellite to complete initial operational 24-satellite constellation.
USA-94 30 August 1993
12:38 		Delta II7925-9.5 CCAFS,LC-17B IIA 13[46] 35 05
30 		B5 6,313 Retired
1 May 2013[17]
Decommissioned from active service using PRN05 in March 2009. Resumed activity using PRN30 in August 2011.[17]
USA-96 26 October 1993
17:04 		Delta II7925-9.5 CCAFS,LC-17B IIA 14[47] 34 04
18 		D6 8,612 Retired
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-100 10 March 1994
03:40 		Delta II7925-9.5 CCAFS,LC-17A IIA 15[53] 36 06
04[54] 		C6 7,289 Retired
21 February 2014[35][36]
USA-117 28 March 1996
00:21 		Delta II7925-9.5 CCAFS,LC-17B IIA 16[55] 33 03 C5 6,702 Retired
2 August 2014[56]
USA-126 16 July 1996
00:50 		Delta II7925-9.5 CCAFS,LC-17A IIA 17[57] 40 10 E6 7,179 Retired
11 March 2016[58]
USA-128 12 September 1996
08:49 		Delta II7925-9.5 CCAFS,LC-17A IIA 18[59] 30 30 B2 5,425 Retired
20 July 2011[35]
GPS IIR-1 17 January 1997
16:28 		Delta II7925-9.5 CCAFS,LC-17A IIR 1 42 12 0 N/A[35]
Failed to reach orbit.
USA-132 23 July 1997
03:43 		Delta II7925-9.5[60] CCAFS,LC-17A IIR 2 43 13 F6 9,852 Operational[35]
Longest-serving satellite in GPS history.
USA-135 6 November 1997
00:30 		Delta II7925-9.5 CCAFS,LC-17A IIA 19[61] 38 08 A3 8,008 Retired
9 October 2019[62]
USA-145 7 October 1999
12:51 		Delta II7925-9.5[63] CCAFS,SLC-17A IIR 3 46 11 D5 7,706 On orbit spare
10 November 2020[35][64]
USA-150 11 May 2000
01:48 		Delta II7925-9.5[65] CCAFS,SLC-17A IIR 4 51 20 E4 8,829 Operational[35]
USA-151 16 July 2000
09:17 		Delta II7925-9.5[66] CCAFS,SLC-17A IIR 5 44 28
22 		B3 8,763 Operational[67][68][69]
USA-154 10 November 2000
17:14 		Delta II7925-9.5[70] CCAFS,SLC-17A IIR 6 41 14
22
 F5 7,918 Retired
25 January 2023[71]
Retired9 July 2020.Subsequently reactivated on20 January 2022and decommissioned again on 25 January 2023.
USA-156 30 January 2001
07:55 		Delta II7925-9.5[72] CCAFS,SLC-17A IIR 7 54 18 E4 6,244 On orbit spare
5 March 2018[73][74]
USA-166 29 January 2003
18:06 		Delta II7925-9.5[75] CCAFS,SLC-17B IIR 8 56 16 B1 7,836 Operational[35]
USA-168 31 March 2003
22:09 		Delta II7925-9.5[76] CCAFS,SLC-17A IIR 9 45 21 D3 7,775 Operational[35]
USA-175 21 December 2003
08:05 		Delta II7925-9.5[77] CCAFS,SLC-17A IIR 10 47 22 E6 6,604 Retired
18 January 2022[78]
USA-177 20 March 2004
17:53 		Delta II7925-9.5[79] CCAFS,SLC-17B IIR 11 59 19 C5 7,420 Operational[35]
USA-178 23 June 2004
22:54 		Delta II7925-9.5[80] CCAFS,SLC-17B IIR 12 60 23 F4 5,732 Retired
2 March 2020[81][35]
USA-180 6 November 2004
05:39 		Delta II7925-9.5[82] CCAFS,SLC-17B IIR 13 61 02 D1 7,189 Operational[35]
USA-183 26 September 2005
03:37 		Delta II7925-9.5[83] CCAFS,SLC-17A IIRM 1 53 17 C4 6,865 Operational[35]
Also known as IIR-14; first to broadcastL2Csignal.
USA-190 25 September 2006
18:50 		Delta II7925-9.5[84] CCAFS,SLC-17A IIRM 2 52 31 A2 6,501 Operational[35]
Also known as IIR-15.
USA-192 17 November 2006
19:12 		Delta II7925-9.5[85] CCAFS,SLC-17A IIRM 3 58 12 B4 6,448 Operational[35]
Also known as IIR-16; first satellite to complete the full operational 31-satellite constellation.
USA-196 17 October 2007
12:23 		Delta II7925-9.5[86] CCAFS,SLC-17A IIRM 4 55 15 F2 6,114 Operational[35]
Also known as IIR-17.
USA-199 20 December 2007
20:04 		Delta II7925-9.5[87] CCAFS,SLC-17A IIRM 5 57 29 C1 6,050 Operational[35]
Also known as IIR-18.
USA-201 15 March 2008
06:10 		Delta II7925-9.5[88] CCAFS,SLC-17A IIRM 6 48 07 A4 5,964 Operational[35]
Also known as IIR-19.
USA-203 24 March 2009
08:34 		Delta II7925-9.5[89] CCAFS,SLC-17A IIRM 7 49 01
27
30
06
NA 		B6 814 In Reserve
Also known as IIR-20; broadcasts demonstrationL5signal. 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-206 17 August 2009
10:35 		Delta II7925-9.5 CCAFS,SLC-17A IIRM 8 50 05 E3 5,444 Operational[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 aUnited States Air Forcepayload,[91]final launch from SLC-17A, and final Delta II 7925.
USA-213 28 May 2010
03:00 		Delta IVM+ (4,2) CCAFS,SLC-37B IIF 1 62 25 B2 5,160 Operational[35]
First to broadcast operational L5 signal.
USA-232 16 July 2011
06:41 		Delta IVM+(4,2) CCAFS,SLC-37B IIF 2 63 01 D2 4,409 Retired
10 August 2023[92][93]
USA-239 4 October 2012
12:10 		Delta IVM+(4,2) CCAFS,SLC-37B IIF 3 65 24 A1 4,300 Operational[35]
USA-242 15 May 2013
21:38 		Atlas V401 CCAFS,SLC-41 IIF 4 66 27 C2 4,077 Operational[35]
USA-248 21 February 2014
01:59 		Delta IVM+ (4,2) CCAFS,SLC-37B IIF 5 64 30 A3 3,795 Operational[35]
USA-251 17 May 2014
00:03 		Delta IVM+ (4,2) CCAFS,SLC-37B IIF 6 67 06 D4 3,710 Operational[35]
USA-256 2 August 2014
03:23 		Atlas V401 CCAFS,SLC-41 IIF 7 68 09 F3 3,633 Operational[35]
USA-258 29 October 2014
17:21 		Atlas V401 CCAFS,SLC-41 IIF 8 69 03 E1 3,545 Operational[35]
USA-260 25 March 2015
18:36 		Delta IVM+ (4,2) CCAFS,SLC-37B IIF 9 71 26 B5 3,398 Operational[35]
USA-262 15 July 2015
15:36 		Atlas V401 CCAFS,SLC-41 IIF 10 72 08 C3 3,286 Operational[35]
USA-265 31 October 2015
16:13 		Atlas V401 CCAFS,SLC-41 IIF 11 73 10 E2 3,178 Operational[94]
USA-266 5 February 2016
13:38 		Atlas V401 CCAFS,SLC-41 IIF 12 70 32 F1 3,081 Operational[95]
USA-289
Vespucci[96] 		23 December 2018
13:51 		Falcon 9 Block 5 CCAFS,SLC-40 III 1 74 04 F4 2,029 Operational[97]
USA-293
Magellan 		22 August 2019
13:06 		Delta IVM+ (4,2) CCAFS,SLC-37B III 2 75 18 D6 1,787 Operational[98]
USA-304
Matthew Henson 		30 June 2020
20:10:46 		Falcon 9 Block 5 CCAFS,SLC-40 III 3 76 23 E5 1,474 Operational[99]
Initially nicknamedColumbus.[100][101]
USA-309
Sacagawea 		5 November 2020
23:24:23 		Falcon 9 Block 5 CCAFS,SLC-40 III 4 77 14 B6 1,346 Operational[102]
USA-319
Neil Armstrong 		17 June 202116:09[103] Falcon 9 Block 5[104] CCSFS,SLC-40[105] III 5 78 11 D5 1,122 Operational[106]
USA-343
Amelia Earhart 		18 January 202312:24 Falcon 9 Block 5 CCSFS,SLC-40 III 6 79 28 A6 542 Operational[107]
  1. ^Length Of Service in days. Includes testing period(s).

Satellites by block[edit]

Further information:GPS satellite blocks
Block Launched Operational Testing/
Reserve 		Unhealthy/
Spare 		Retired Launch
Failures 		Manufacturer Remarks
Block I 11 0 0 0 10 1 Rockwell International
Block II 9 0 0 0 9 0 Rockwell International One unlaunched prototype
Block IIA 19 0 0 0 19 0 Rockwell International
Block IIR 13 7 0 2 3 1 Lockheed Martin
Block IIRM 8 7 0 1 0 0 Lockheed Martin
Block IIF 12 11 0 0 1 0 Boeing
Block III 6 6 0 0 0 0 Lockheed Martin
Block IIIF 0 0 0 0 0 0 Lockheed Martin
Total 78 31 0 3 42 2

Orbital slots (by SVN)[edit]

Refer toGPS Constellation Statusfor the most up-to-date information.

As of 10 August 2023
Slot Plane
A B C D E F
1 65 56 57 61 69 70
2 52 62 66 73 55
3 64 44 72 45 50 68
4 48 58 53 67 51 74
5 71 59 78 76
6 79 77 75 43
Block IIR IIRM IIF III

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[edit]

As of 23 August 2023,31 of 32 PRNs are in use; PRN01is unassigned. Two additional satellites are designated as on-orbit spares.

PRN 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 --
IIR O S O O S O O O O
IIRM O O O O O O O S
IIF R O O O O O O O O O O O
III O O O O O O
Legend:
  • O – Operational
  • T – Testing in preparation for operation
  • S – On orbit Spare
  • U – Unhealthy and unusable
  • R – Retired

PRN to SVN history[edit]

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 theIGSANTEXfile[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 madeavailableby theBernese GNSS Software.

Planned launches[edit]

Block III[edit]

Main article:GPS Block III
Date Rocket Launch site Satellite SVN Remarks
June 2024[108][109] Vulcan Centaur CCSFSSLC-41 GPS III SV07Sally Ride 80 Space 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 Centaur CCSFSSLC-41 GPS III SV08Katherine Johnson 81 Space 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 Centaur CCSFSSLC-41 GPS III SV09Ellison Onizuka 82 Space vehicle manufacturing contract awarded September 2016.[119]

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

2026[120] Falcon 9 Block 5 CCSFS,SLC-40 GPS III SV10Hedy Lamarr 83 Space 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[edit]

Main article:GPS Block IIIF
Projected Available For Launch (AFL) Date Rocket Launch site Satellite SVN Remarks
Feb 2026[124][125] Falcon Heavy KSC,LC-39A GPS IIIF SV11 Construction contract awarded in September 2018. In production.
Aug 2026[126] GPS IIIF SV12 In 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 SV17 Technology 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 SV23 Technology 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 SV29 Technology Insertion Point
GPS IIIF SV30
FY2034[129] GPS IIIF SV31
GPS IIIF SV32

See also[edit]

References[edit]

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  42. ^"Navstar IIA-11".NASA.Retrieved25 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
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  45. ^"Navstar IIA-12".NASA.Retrieved25 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
  46. ^"Navstar IIA-13".NASA.Retrieved25 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
  47. ^"Navstar IIA-14".NASA.Retrieved25 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
  48. ^"Notice Advisory to GPS Users".navcen.uscg.gov.Retrieved28 October2019.Public DomainThis article incorporates text from this source, which is in thepublic domain.
  49. ^"Farewell to a Great Generation: GPS IIA".Inside GNSS – Global Navigation Satellite Systems Engineering, Policy, and Design.15 April 2020.Retrieved18 June2021.
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  55. ^"Navstar IIA-16".NASA.Retrieved25 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
  56. ^"NANU 2014-063".Retrieved28 June2015.
  57. ^"Navstar IIA-17".NASA.Retrieved25 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
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  60. ^"Navstar 43".NASA.Retrieved26 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
  61. ^"Navstar 38".NASA.Retrieved26 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
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  63. ^"Navstar 46".NASA.Retrieved26 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
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  66. ^"Navstar 48".NASA.Retrieved26 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
  67. ^NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021035 SUBJ: SVN44 (PRN28) DECOMMISSIONING
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  76. ^"Navstar 52".NASA.Retrieved26 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
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  79. ^"Navstar 54".NASA.Retrieved26 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
  80. ^"Navstar 55".NASA.Retrieved26 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
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  82. ^"Navstar 56".NASA.Retrieved26 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
  83. ^"Navstar 57".NASA.Retrieved26 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
  84. ^"GPS 2R-15".NASA.Retrieved26 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
  85. ^"Navstar 59".NASA.Retrieved26 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
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  88. ^"Navstar 62".NASA.Retrieved26 April2013.Public DomainThis article incorporates text from this source, which is in thepublic domain.
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  92. ^"NANU 2023-004".Retrieved12 November2023.Public DomainThis article incorporates text from this source, which is in thepublic domain.
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  94. ^"NANU 2015-093".Retrieved10 December2015.Public DomainThis article incorporates text from this source, which is in thepublic domain.
  95. ^"NANU 2016-011".Retrieved9 March2016.Public DomainThis article incorporates text from this source, which is in thepublic domain.
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  97. ^"NANU 2020-004".Retrieved13 January2020.Public DomainThis article incorporates text from this source, which is in thepublic domain.
  98. ^"NANU 2020-015".Retrieved2 April2020.Public DomainThis article incorporates text from this source, which is in thepublic domain.
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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.Retrieved22 December2018.Public DomainThis article incorporates text from this source, which is in thepublic domain.
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  120. ^Dunn, Michael (6 March 2023)."Directions 2023: Advancing GPS to Meet the Future".GPSWorld.com.Retrieved21 March2023.
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External links[edit]

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