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, 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.

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

Satellites by launch date

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 by Rockwell International to secure Block II contract; never launched.
USA-35 14 February 1989
18:30		 Delta II 6925-9.5 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 II 6925-9.5 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 II 6925-9.5 CCAFS, LC-17A[14] II 3[19] 16 16 4,075 Retired
13 October 2000[17]
USA-47 21 October 1989
09:31		 Delta II 6925-9.5 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 II 6925-9.5 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 II 6925-9.5 CCAFS, LC-17A[14] II 6[22] 18 18 3,860 Retired
18 August 2000[17]
USA-54 26 March 1990
02:45		 Delta II 6925-9.5 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 II 6925-9.5 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 II 6925-9.5 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 II 7925-9.5 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 II 7925-9.5 CCAFS, LC-17A IIA 2[28] 24 24 D1 7,394 Retired
30 September 2011[29]
USA-79 23 February 1992
22:29		 Delta II 7925-9.5 CCAFS, LC-17B IIA 3[30] 25 25 A2 6,509 Retired
18 December 2009
USA-80 10 April 1992
03:20		 Delta II 7925-9.5 CCAFS, LC-17B IIA 4[31] 28 28 C2 1,954 Retired
15 August 1997[17]
Retired early, replaced by USA-117.
USA-83 7 July 1992
09:20		 Delta II 7925-9.5 CCAFS, LC-17B IIA 5[32] 26 26 F5 8,219 Retired
6 January 2015[33]
USA-84 9 September 1992
08:57		 Delta II 7925-9.5 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 II 7925-9.5 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 resumed L-band transmission in 2014 but signal unusable.[17][35]
USA-87 18 December 1992
22:16		 Delta II 7925-9.5 CCAFS, LC-17B IIA 8[38] 29 29 F5 5,423 Retired
23 October 2007[39]
USA-88 3 February 1993
02:55		 Delta II 7925-9.5 CCAFS, LC-17A IIA 9[40] 22 22 B1 3,591 Retired
3 December 2002[17]
USA-90 30 March 1993
03:09		 Delta II 7925-9.5 CCAFS, LC-17A IIA 10[41] 31 31 C3 4,592 Retired
24 October 2005
USA-91 13 May 1993
00:07		 Delta II 7925-9.5 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 II 7925-9.5 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 II 7925-9.5 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 II 7925-9.5 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 II 7925-9.5 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 II 7925-9.5 CCAFS, LC-17B IIA 16[55] 33 03 C5 6,702 Retired
2 August 2014[56]
USA-126 16 July 1996
00:50		 Delta II 7925-9.5 CCAFS, LC-17A IIA 17[57] 40 10 E6 7,179 Retired
11 March 2016[58]
USA-128 12 September 1996
08:49		 Delta II 7925-9.5 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 II 7925-9.5 CCAFS, LC-17A IIR 1 42 12 0 N/A[35]
Failed to reach orbit.
USA-132 23 July 1997
03:43		 Delta II 7925-9.5[60] CCAFS, LC-17A IIR 2 43 13 F6 9,666 Operational[35]
Longest-serving satellite in GPS history.
USA-135 6 November 1997
00:30		 Delta II 7925-9.5 CCAFS, LC-17A IIA 19[61] 38 08 A3 8,008 Retired
9 October 2019[62]
USA-145 7 October 1999
12:51		 Delta II 7925-9.5[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 II 7925-9.5[65] CCAFS, SLC-17A IIR 4 51 20 E4 8,643 Operational[35]
USA-151 16 July 2000
09:17		 Delta II 7925-9.5[66] CCAFS, SLC-17A IIR 5 44 28
22		 B3 8,577 Operational[67][68][69]
USA-154 10 November 2000
17:14		 Delta II 7925-9.5[70] CCAFS, SLC-17A IIR 6 41 14
22
 F5 7,918 Retired
25 January 2023[71]
Retired 9 July 2020. Subsequently reactivated on 20 January 2022 and decommissioned again on 25 January 2023.
USA-156 30 January 2001
07:55		 Delta II 7925-9.5[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 II 7925-9.5[75] CCAFS, SLC-17B IIR 8 56 16 B1 7,650 Operational[35]
USA-168 31 March 2003
22:09		 Delta II 7925-9.5[76] CCAFS, SLC-17A IIR 9 45 21 D3 7,589 Operational[35]
USA-175 21 December 2003
08:05		 Delta II 7925-9.5[77] CCAFS, SLC-17A IIR 10 47 22 E6 6,604 Retired
18 January 2022[78]
USA-177 20 March 2004
17:53		 Delta II 7925-9.5[79] CCAFS, SLC-17B IIR 11 59 19 C5 7,234 Operational[35]
USA-178 23 June 2004
22:54		 Delta II 7925-9.5[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 II 7925-9.5[82] CCAFS, SLC-17B IIR 13 61 02 D1 7,003 Operational[35]
USA-183 26 September 2005
03:37		 Delta II 7925-9.5[83] CCAFS, SLC-17A IIRM 1 53 17 C4 6,679 Operational[35]
Also known as IIR-14; first to broadcast L2C signal.
USA-190 25 September 2006
18:50		 Delta II 7925-9.5[84] CCAFS, SLC-17A IIRM 2 52 31 A2 6,315 Operational[35]
Also known as IIR-15.
USA-192 17 November 2006
19:12		 Delta II 7925-9.5[85] CCAFS, SLC-17A IIRM 3 58 12 B4 6,262 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 II 7925-9.5[86] CCAFS, SLC-17A IIRM 4 55 15 F2 5,928 Operational[35]
Also known as IIR-17.
USA-199 20 December 2007
20:04		 Delta II 7925-9.5[87] CCAFS, SLC-17A IIRM 5 57 29 C1 5,864 Operational[35]
Also known as IIR-18.
USA-201 15 March 2008
06:10		 Delta II 7925-9.5[88] CCAFS, SLC-17A IIRM 6 48 07 A4 5,778 Operational[35]
Also known as IIR-19.
USA-203 24 March 2009
08:34		 Delta II 7925-9.5[89] CCAFS, SLC-17A IIRM 7 49 01
27
30
06
NA		 B6 814 In 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-206 17 August 2009
10:35		 Delta II 7925-9.5 CCAFS, SLC-17A IIRM 8 50 05 E3 5,258 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 a United States Air Force payload,[91] final launch from SLC-17A, and final Delta II 7925.
USA-213 28 May 2010
03:00		 Delta IV M+ (4,2) CCAFS, SLC-37B IIF 1 62 25 B2 4,974 Operational[35]
First to broadcast operational L5 signal.
USA-232 16 July 2011
06:41		 Delta IV M+(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 IV M+(4,2) CCAFS, SLC-37B IIF 3 65 24 A1 4,114 Operational[35]
USA-242 15 May 2013
21:38		 Atlas V 401 CCAFS, SLC-41 IIF 4 66 27 C2 3,891 Operational[35]
USA-248 21 February 2014
01:59		 Delta IV M+ (4,2) CCAFS, SLC-37B IIF 5 64 30 A3 3,609 Operational[35]
USA-251 17 May 2014
00:03		 Delta IV M+ (4,2) CCAFS, SLC-37B IIF 6 67 06 D4 3,524 Operational[35]
USA-256 2 August 2014
03:23		 Atlas V 401 CCAFS, SLC-41 IIF 7 68 09 F3 3,447 Operational[35]
USA-258 29 October 2014
17:21		 Atlas V 401 CCAFS, SLC-41 IIF 8 69 03 E1 3,359 Operational[35]
USA-260 25 March 2015
18:36		 Delta IV M+ (4,2) CCAFS, SLC-37B IIF 9 71 26 B5 3,212 Operational[35]
USA-262 15 July 2015
15:36		 Atlas V 401 CCAFS, SLC-41 IIF 10 72 08 C3 3,100 Operational[35]
USA-265 31 October 2015
16:13		 Atlas V 401 CCAFS, SLC-41 IIF 11 73 10 E2 2,992 Operational[94]
USA-266 5 February 2016
13:38		 Atlas V 401 CCAFS, SLC-41 IIF 12 70 32 F1 2,895 Operational [95]
USA-289
Vespucci[96]		 23 December 2018
13:51		 Falcon 9 Block 5 CCAFS, SLC-40 III 1 74 04 F4 1,843 Operational [97]
USA-293
Magellan		 22 August 2019
13:06		 Delta IV M+ (4,2) CCAFS, SLC-37B III 2 75 18 D6 1,601 Operational [98]
USA-304
Matthew Henson		 30 June 2020
20:10:46		 Falcon 9 Block 5 CCAFS, SLC-40 III 3 76 23 E5 1,288 Operational[99]
Initially nicknamed Columbus.[100][101]
USA-309
Sacagawea		 5 November 2020
23:24:23		 Falcon 9 Block 5 CCAFS, SLC-40 III 4 77 14 B6 1,160 Operational[102]
USA-319
Neil Armstrong		 17 June 2021 16:09[103] Falcon 9 Block 5[104] CCAFS, SLC-40[105] III 5 78 11 D5 936 Operational[106]
USA-343
Amelia Earhart		 18 January 2023 12:24 Falcon 9 Block 5 CCAFS, SLC-40 III 6 79 28 A6 356 Operational[107]
  1. ↑ Length Of Service in days. Includes testing period(s).

Satellites by block

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)

Refer to GPS Constellation Status for 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

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

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, 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

Block III

Date Rocket Launch site Satellite SVN Remarks
June 2024[108][109] Vulcan Centaur CCSFS SLC-41 GPS III SV07 Sally 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 CCSFS SLC-41 GPS III SV08 Katherine 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 CCSFS SLC-41 GPS III SV09 Ellison 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 SV10 Hedy 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

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

References

  1. ↑ US Government. "GPS.gov". gps.gov. U.S. Government. Retrieved 21 March 2015. Public Domain 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.
  3. ↑ "Navstar 1". NASA. Retrieved 21 November 2020. Public Domain This article incorporates text from this source, which is in the public domain.
  4. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 "USNO Block 1 Satellite Information". Retrieved 28 June 2015. Public Domain This article incorporates text from this source, which is in the public domain.
  5. ↑ "Navstar 2". NASA. Retrieved 21 November 2020. Public Domain This article incorporates text from this source, which is in the public domain.
  6. ↑ "Navstar 3". NASA. Retrieved 21 November 2020. Public Domain This article incorporates text from this source, which is in the public domain.
  7. ↑ "Navstar 4". NASA. Retrieved 21 November 2020. Public Domain This article incorporates text from this source, which is in the public domain.
  8. ↑ "Navstar 5". NASA. Retrieved 24 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  9. ↑ "Navstar 6". NASA. Retrieved 24 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  10. ↑ "Navstar 8". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  11. ↑ "Navstar 9". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  12. ↑ "Navstar 10". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  13. ↑ "Navstar 11". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  14. 1 2 3 4 5 6 7 8 9 Wade, Mark. "Delta 6925". Encyclopedia Astronautica. Archived from the original on 22 May 2013. Retrieved 25 April 2013.
  15. ↑ "Navstar II-1". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  16. ↑ "NAVSTAR GPS II-1 - Summary". Space and Tech. Archived from the original on 12 December 2011. Retrieved 10 July 2012.
  17. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 "USNO Block 2 Satellite Information". Retrieved 28 June 2015. Public Domain This article incorporates text from this source, which is in the public domain.
  18. ↑ "Navstar II-2". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  19. ↑ "Navstar II-3". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  20. ↑ "Navstar II-4". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  21. ↑ "Navstar II-5". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  22. ↑ "Navstar II-6". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  23. ↑ "Navstar II-7". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  24. ↑ "Navstar II-8". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  25. ↑ "Navstar II-9". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  26. ↑ "Navstar 2A-01". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  27. ↑ "Notice Advisory To NAVSTAR Users (NANU) 2016008". U.S. Coast Guard Navigation Center. Retrieved 26 January 2016. Public Domain This article incorporates text from this source, which is in the public domain.
  28. ↑ "Navstar 2A-02". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  29. ↑ "NANU 2011088". Archived from the original on 8 April 2013. Retrieved 4 November 2011. Public Domain This article incorporates text from this source, which is in the public domain.
  30. ↑ "Navstar 2A-03". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  31. ↑ "Navstar 2A-04". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
  32. ↑ "Navstar IIA-05". NASA. Retrieved 25 April 2013. Public Domain This article incorporates text from this source, which is in the public domain.
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