List of GPS satellites

As of March 2015, 69 Global Positioning System navigation satellites have been launched, not all remain operational. The minimum number of satellites for a full constellation is 24 operational 95% of the time, the current number exceeds this. The target number is 31 and decommissioned reserves are available to maintain the numbers.[1]

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

Satellites

Satellites by Launch dates

Satellite Launch (UTC) Carrier rocket Launch site Block № SVN PRN Slot Retired Remarks
OPS 5111 22 February 1978
23:44		 Atlas E/F SGS-1 VAFB SLC-3E I I1[2] 01 04 01985-07-17-000017 July 1985
OPS 5112 13 May 1978
10:34		 Atlas E/F SGS-1 VAFB SLC-3E I I2[3] 02 07 01981-07-16-000016 July 1981
OPS 5113 7 October 1978
00:28		 Atlas E/F SGS-1 VAFB SLC-3E I I3[4] 03 06 01992-05-18-000018 May 1992
OPS 5114 11 December 1978
03:59		 Atlas E/F SGS-1 VAFB SLC-3E I I4[5] 04 08 01989-10-14-000014 October 1989
OPS 5117 9 February 1980
23:08		 Atlas E/F SGS-1 VAFB SLC-3E I I5[6] 05 05 01983-11-28-000028 November 1983
OPS 5118 26 April 1980
22:00		 Atlas E/F SGS-1 VAFB SLC-3E I I6[7] 06 09 01991-03-06-00006 March 1991
N/A
(Navstar 7)		 19 December 1981
01:10		 Atlas E/F SGS-1 VAFB SLC-3E I I7 07 N/A Failed to orbit
OPS 9794 14 July 1983
10:21		 Atlas E/F SGS-2 VAFB SLC-3W I I8[8] 08 11 01993-05-04-00004 May 1993
USA-001USA-1 13 June 1984
11:37		 Atlas E/F SGS-2 VAFB SLC-3W I I9[9] 09 13 01994-06-20-000020 June 1994
USA-005USA-5 8 September 1984
21:41		 Atlas E/F SGS-2 VAFB SLC-3W I I10[10] 10 12 01995-11-18-000018 November 1995
USA-010USA-10 9 October 1985
02:53		 Atlas E/F SGS-2 VAFB SLC-3W I I11[11] 11 03 01994-04-13-000013 April 1994
N/A
(Block II prototype)		 II 0 12 N/A Qualification vehicle built by Rockwell International to secure Block II contract; never launched
USA-035USA-35 14 February 1989
18:30		 Delta II 6925-9.5 CCAFS SLC-17A[12] II II1[13] 14 02000-03-26-000026 March 2000
USA-038USA-38 10 June 1989
22:30		 Delta II 6925-9.5 CCAFS SLC-17A[12] II II2[14] 13 B3 02004-05-13-000013 May 2004
USA-042USA-42 18 August 1989
05:58		 Delta II 6925-9.5 CCAFS SLC-17A[12] II II3[15] 16 02000-10-13-000013 October 2000
USA-047USA-47 21 October 1989
09:31		 Delta II 6925-9.5 CCAFS SLC-17A[12] II II4[16] 19 A5 02001-09-11-000011 September 2001
USA-049USA-49 11 December 1989
18:10		 Delta II 6925-9.5 CCAFS SLC-17B[12] II II5[17] 17 D3 02005-02-23-000023 February 2005
USA-050USA-50 24 January 1990
22:55		 Delta II 6925-9.5 CCAFS SLC-17A[12] II II6[18] 18 02000-08-18-000018 August 2000
USA-054USA-54 26 March 1990
02:45		 Delta II 6925-9.5 CCAFS SLC-17A[12] II II7[19] 20 01996-12-13-000013 December 1996 Decommissioned after twice changing frequency without being commanded to
USA-063USA-63 2 August 1990
05:39		 Delta II 6925-9.5 CCAFS SLC-17A[12] II II8[20] 21 E2 02003-01-27-000027 January 2003
USA-064USA-64 1 October 1990
21:56		 Delta II 6925-9.5 CCAFS SLC-17A[12] II II9[21] 15 D5 02007-03-14-000014 March 2007 Used only for testing from 17 November 2006 until retirement
USA-066USA-66 26 November 1990
21:39		 Delta II 7925-9.5 CCAFS SLC-17A IIA IIA1[22] 23 32 E5 02015-05-01-0000Operational[23]
USA-071USA-71 4 July 1991
02:32		 Delta II 7925-9.5 CCAFS SLC-17A IIA IIA2[24] 24 24 D1 02011-11-04-00004 November 2011[25]
USA-079USA-79 23 February 1992
22:29		 Delta II 7925-9.5 CCAFS SLC-17A IIA IIA3[26] 25 25 A2 02009-12-18-000018 December 2009[27]
USA-080USA-80 10 April 1992
03:20		 Delta II 7925-9.5 CCAFS SLC-17B IIA IIA4[28] 28 28 C2 01997-08-15-000015 August 1997 Retired early, replaced by USA-117
USA-083USA-83 7 July 1992
09:20		 Delta II 7925-9.5 CCAFS SLC-17B IIA IIA5[29] 26 26 F5 02015-01-06-00006 January 2015[30]
USA-084USA-84 9 September 1992
08:57		 Delta II 7925-9.5 CCAFS SLC-17A IIA IIA6[31] 27 A6 02012-10-06-00006 October 2012[27]
USA-085USA-85 22 November 1992
23:54		 Delta II 7925-9.5 CCAFS SLC-17A IIA IIA7[32] 32 0131
01
30
NA		 F4 02008-03-17-000017 March 2008[27] PRN changed from 31 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.[33]
USA-087USA-87 18 December 1992
22:16		 Delta II 7925-9.5 CCAFS SLC-17B IIA IIA8[34] 29 29 F5 02007-10-23-000023 October 2007
USA-088USA-88 3 February 1993
02:55		 Delta II 7925-9.5 CCAFS SLC-17A IIA IIA9[35] 22 22 B1 02003-08-06-00006 August 2003
USA-090USA-90 30 March 1993
03:09		 Delta II 7925-9.5 CCAFS SLC-17A IIA IIA10[36] 31 31 C3 02005-10-24-000024 October 2005
USA-091USA-91 13 May 1993
00:07		 Delta II 7925-9.5 CCAFS SLC-17A IIA IIA11[37] 37 07 C4 02007-12-20-000020 December 2007
USA-092USA-92 26 June 1993
13:27		 Delta II 7925-9.5 CCAFS SLC-17A IIA IIA12[38] 39 09 A5 02014-05-19-000019 May 2014
USA-094USA-94 30 August 1993
12:38		 Delta II 7925-9.5 CCAFS SLC-17B IIA IIA13[39] 35 30
03		 B5 02013-05-01-00001 May 2013
USA-096USA-96 26 October 1993
17:04		 Delta II 7925-9.5 CCAFS SLC-17B IIA IIA14[40] 34 04 D6 02015-05-01-0000Operational
USA-100 10 March 1994
03:40		 Delta II 7925-9.5 CCAFS SLC-17A IIA IIA15[41] 36 06 C6 02014-02-21-000021 February 2014
USA-117 28 March 1996
00:21		 Delta II 7925-9.5 CCAFS SLC-17B IIA IIA16[42] 33 03 C5 02014-08-02-000002 August 2014
USA-126 16 July 1996
00:50		 Delta II 7925-9.5 CCAFS SLC-17A IIA IIA17[43] 40 10 E6 02015-05-01-0000Operational
USA-128 12 September 1996
08:49		 Delta II 7925-9.5 CCAFS SLC-17A IIA IIA18[44] 30 30 B2 02011-07-20-000020 July 2011
N/A
(GPS IIR-1)		 17 January 1997
16:28		 Delta II 7925-9.5 CCAFS SLC-17A IIR IIR1 42 12 N/A Failed to orbit
USA-132 23 July 1997
03:43		 Delta II 7925-9.5[45] CCAFS SLC-17A IIR IIR2 43 13 F6 02015-05-01-0000Operational
USA-135 6 November 1997
00:30		 Delta II 7925-9.5 CCAFS SLC-17A IIA IIA19[46] 38 08 A3 02014-10-30-000030 October 2014
USA-145 7 October 1999
12:51		 Delta II 7925-9.5[47] CCAFS SLC-17A IIR IIR3 46 11 D5 02015-05-01-0000Operational
USA-150 11 May 2000
01:48		 Delta II 7925-9.5[48] CCAFS SLC-17A IIR IIR4 51 20 B6 02015-05-01-0000Operational
USA-151 16 July 2000
09:17		 Delta II 7925-9.5[49] CCAFS SLC-17A IIR IIR5 44 28 B3 02015-05-01-0000Operational
USA-154 10 November 2000
17:14		 Delta II 7925-9.5[50] CCAFS SLC-17A IIR IIR6 41 14 F1 02015-05-01-0000Operational
USA-156 30 January 2001
07:55		 Delta II 7925-9.5[51] CCAFS SLC-17A IIR IIR7 54 18 E4 02015-05-01-0000Operational
USA-166 29 January 2003
18:06		 Delta II 7925-9.5[52] CCAFS SLC-17B IIR IIR8 56 16 B1 02015-05-01-0000Operational
USA-168 31 March 2003
22:09		 Delta II 7925-9.5[53] CCAFS SLC-17A IIR IIR9 45 21 D3 02015-05-01-0000Operational
USA-175 21 December 2003
08:05		 Delta II 7925-9.5[54] CCAFS SLC-17A IIR IIR10 47 22 E2 02015-05-01-0000Operational
USA-177 20 March 2004
17:53		 Delta II 7925-9.5[55] CCAFS SLC-17B IIR IIR11 59 19 C3 02015-05-01-0000Operational
USA-178 23 June 2004
22:54		 Delta II 7925-9.5[56] CCAFS SLC-17B IIR IIR12 60 23 F4 02015-05-01-0000Operational
USA-180 6 November 2004
05:39		 Delta II 7925-9.5[57] CCAFS SLC-17B IIR IIR13 61 02 D1 02015-05-01-0000Operational
USA-183 26 September 2005
03:37		 Delta II 7925-9.5[58] CCAFS SLC-17A IIRM IIRM1 53 17 C4 02015-05-01-0000Operational Also known as IIR-14; first to broadcast L2C signal.
USA-190 25 September 2006
18:50		 Delta II 7925-9.5[59] CCAFS SLC-17A IIRM IIRM2 52 31 A2 02015-05-01-0000Operational Also known as IIR-15; first satellite to complete a fully operational 32-satellite constellation
USA-192 17 November 2006
19:12		 Delta II 7925-9.5[60] CCAFS SLC-17A IIRM IIRM3 58 12 B4 02015-05-01-0000Operational Also known as IIR-16
USA-196 17 October 2007
12:23		 Delta II 7925-9.5[61] CCAFS SLC-17A IIRM IIRM4 55 15 F2 02015-05-01-0000Operational Also known as IIR-17
USA-199 20 December 2007
20:04		 Delta II 7925-9.5[62] CCAFS SLC-17A IIRM IIRM5 57 29 C1 02015-05-01-0000Operational Also known as IIR-18
USA-201 15 March 2008
06:10		 Delta II 7925-9.5[63] CCAFS SLC-17A IIRM IIRM6 48 07 A4 02015-05-01-0000Operational Also known as IIR-19
USA-203 24 March 2009
08:34		 Delta II 7925-9.5[64] CCAFS SLC-17A IIRM IIRM7 49 2701
27
30
06
NA		 B6 02011-05-06-0000In 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.[27]
USA-206 17 August 2009
10:35		 Delta II 7925-9.5 CCAFS SLC-17A IIRM IIRM8 50 05 E3 02015-05-01-0000Operational Originally scheduled for launch in 1999 as IIR-3 but damaged during processing. Also known as IIR-21; L5 services disconnected from J2 port before launch. Final Delta II launch with a US Air Force payload.[65] Final launch from SLC-17A, final Delta II 7925.
USA-213 28 May 2010
03:00		 Delta IV-M+(4,2) CCAFS SLC-37B IIF IIF1 62 25 B2 02015-05-01-0000Operational First to broadcast operational L5 signal.
USA-232 16 July 2011
06:41		 Delta IV-M+(4,2) CCAFS SLC-37B IIF IIF2 63 01 D2 02015-05-01-0000Operational[27]
USA-239 4 October 2012
12:10		 Delta IV-M+(4,2) CCAFS SLC-37B IIF IIF3 65 24 A1 02015-05-01-0000Operational[27]
USA-242 15 May 2013
21:38		 Atlas V 401 CCAFS SLC-41 IIF IIF4 66 27 C2 02015-05-01-0000Operational
USA-248 21 February 2014
01:59		 Delta IV-M+(4,2) CCAFS SLC-37B IIF IIF5 64 30 A3 02015-05-01-0000Operational
USA-251 17 May 2014
00:03		 Delta IV-M+(4,2) CCAFS SLC-37B IIF IIF6 67 06 D4 02015-05-01-0000Operational
USA-256 2 August 2014
03:23		 Atlas V 401 CCAFS SLC-41 IIF IIF7 68 09 F3 02015-05-01-0000Operational
USA-258 29 October 2014
17:21		 Atlas V 401 CCAFS SLC-41 IIF IIF8 69 03 E1 02015-05-01-0000Operational
USA-260 25 March 2015
18:36		 Delta IV-M+(4,2) CCAFS SLC-37B IIF IIF9 71 26 B5 02015-05-01-0000Operational

Satellites by block

Block Launched Operational Testing/
Reserve		 Unhealthy Retired Launch
Failures		 Remarks
Block I 11 0 0 0 10 1
Block II 9 0 0 0 9 0 One prototype was never launched
Block IIA 19 3 0 1 15 0
Block IIR 13 12 0 0 0 1
Block IIRM 8 7 1 0 0 0
Block IIF 9 9 0 0 0 0 Launches continuing; 12 total planned
Total 69 31 1 1 34 2

Orbital slots (by SVN)

Slot Plane
A B C D E F
1 65 56 57 61 69 41
2 52 62 66 63 47 55
3 64 44 59 45 50 68
4 48 58 53 67 54 60
5 (39) 71 (33) 46 23 (26)
6 - 51 (36) 34 40 43

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.

Cross reference of PRNs to satellite blocks

The following table is for the purpose of making it possible to determine the block associated with a PRN by looking at one column in one table rather than having to search through all rows of three tables. Thus this table can be used to quickly and easily determine the number of satellites in orbit and health associated with each block.

Cross reference of PRNs to blocks
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 NA Legend:
H = In orbit and healthy
R = Placed in reserve
U = Unhealthy and unusable
D = Decommissioned
T = Launched and undergoing testing
IIA H D H H
IIR H H H H H H H H H H H H
IIR-M H H H H H H H R
IIF H H H H H H H H H

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 IIF

Date Rocket Type Serial no Launch site Satellite SVN Remarks
June 2015 Atlas V 401 CCAFS SLC-41 GPS IIF-10 72
September 2015 Atlas V 401 CCAFS SLC-41 GPS IIF-11 73
January 2016 Atlas V 401 CCAFS SLC-41 GPS IIF-12 70

Block IIIA

Main article: GPS Block IIIA
Date Rocket Type Serial no Launch site Satellite SVN Remarks
NET 2017 TBD TBD CCAFS GPS IIIA-1 74 [66]
NET 2017 TBD TBD CCAFS GPS IIIA-2 75 [66]
TBD TBD TBD CCAFS (TBD) GPS IIIA-3 76 [66]
TBD TBD TBD CCAFS (TBD) GPS IIIA-4 77 [66]
TBD TBD TBD CCAFS (TBD) GPS IIIA-5 78

See also

References

  1. ↑ US Government. "GPS.gov". GPS.gov. US Govt. Retrieved 21 March 2015.
  2. ↑ "Navstar 1". NASA. Retrieved 24 April 2013.
  3. ↑ "Navstar 2". NASA. Retrieved 24 April 2013.
  4. ↑ "Navstar 3". NASA. Retrieved 24 April 2013.
  5. ↑ "Navstar 4". NASA. Retrieved 24 April 2013.
  6. ↑ "Navstar 5". NASA. Retrieved 24 April 2013.
  7. ↑ "Navstar 6". NASA. Retrieved 24 April 2013.
  8. ↑ "Navstar 8". NASA. Retrieved 25 April 2013.
  9. ↑ "Navstar 9". NASA. Retrieved 25 April 2013.
  10. ↑ "Navstar 10". NASA. Retrieved 25 April 2013.
  11. ↑ "Navstar 11". NASA. Retrieved 25 April 2013.
  12. ↑ 12.0 12.1 12.2 12.3 12.4 12.5 12.6 12.7 12.8 Wade, Mark. "Delta 6925". Encyclopedia Astronautica. Retrieved 25 April 2013.
  13. ↑ "Navstar II-1". NASA. Retrieved 25 April 2013.
  14. ↑ "Navstar II-2". NASA. Retrieved 25 April 2013.
  15. ↑ "Navstar II-3". NASA. Retrieved 25 April 2013.
  16. ↑ "Navstar II-4". NASA. Retrieved 25 April 2013.
  17. ↑ "Navstar II-5". NASA. Retrieved 25 April 2013.
  18. ↑ "Navstar II-6". NASA. Retrieved 25 April 2013.
  19. ↑ "Navstar II-7". NASA. Retrieved 25 April 2013.
  20. ↑ "Navstar II-8". NASA. Retrieved 25 April 2013.
  21. ↑ "Navstar II-9". NASA. Retrieved 25 April 2013.
  22. ↑ "Navstar IIA-01". NASA. Retrieved 25 April 2013.
  23. ↑ "GPS satellite achieves 20 years in orbit". US Air Force. 30 November 2011. Archived from the original on 12 December 2012. Retrieved 25 April 2013.
  24. ↑ "Navstar IIA-02". NASA. Retrieved 25 April 2013.
  25. ↑ "NANU 2011088". Retrieved 4 November 2011.
  26. ↑ "Navstar IIA-03". NASA. Retrieved 25 April 2013.
  27. ↑ 27.0 27.1 27.2 27.3 27.4 27.5 "NGA Current GPS Satellite Data". Retrieved 24 September 2011.
  28. ↑ "Navstar IIA-04". NASA. Retrieved 25 April 2013.
  29. ↑ "Navstar IIA-05". NASA. Retrieved 25 April 2013.
  30. ↑ "NANU 20150106". Retrieved 7 January 2015.
  31. ↑ "Navstar IIA-06". NASA. Retrieved 25 April 2013.
  32. ↑ "Navstar IIA-07". NASA. Retrieved 25 April 2013.
  33. ↑ "Current GPS Satellite Data". NGA. Retrieved 16 June 2014.
  34. ↑ "Navstar IIA-08". NASA. Retrieved 25 April 2013.
  35. ↑ "Navstar IIA-09". NASA. Retrieved 25 April 2013.
  36. ↑ "Navstar IIA-10". NASA. Retrieved 25 April 2013.
  37. ↑ "Navstar IIA-11". NASA. Retrieved 25 April 2013.
  38. ↑ "Navstar IIA-12". NASA. Retrieved 25 April 2013.
  39. ↑ "Navstar IIA-13". NASA. Retrieved 25 April 2013.
  40. ↑ "Navstar IIA-14". NASA. Retrieved 25 April 2013.
  41. ↑ "Navstar IIA-15". NASA. Retrieved 25 April 2013.
  42. ↑ "Navstar IIA-16". NASA. Retrieved 25 April 2013.
  43. ↑ "Navstar IIA-17". NASA. Retrieved 25 April 2013.
  44. ↑ "Navstar IIA-18". NASA. Retrieved 25 April 2013.
  45. ↑ "Navstar 43". NASA. Retrieved 26 April 2013.
  46. ↑ "Navstar 38". NASA. Retrieved 26 April 2013.
  47. ↑ "Navstar 46". NASA. Retrieved 26 April 2013.
  48. ↑ "Navstar 47". NASA. Retrieved 26 April 2013.
  49. ↑ "Navstar 48". NASA. Retrieved 26 April 2013.
  50. ↑ "Navstar 49". NASA. Retrieved 26 April 2013.
  51. ↑ "Navstar 50". NASA. Retrieved 26 April 2013.
  52. ↑ "Navstar 51". NASA. Retrieved 26 April 2013.
  53. ↑ "Navstar 52". NASA. Retrieved 26 April 2013.
  54. ↑ "Navstar 53". NASA. Retrieved 26 April 2013.
  55. ↑ "Navstar 54". NASA. Retrieved 26 April 2013.
  56. ↑ "Navstar 55". NASA. Retrieved 26 April 2013.
  57. ↑ "Navstar 56". NASA. Retrieved 26 April 2013.
  58. ↑ "Navstar 57". NASA. Retrieved 26 April 2013.
  59. ↑ "GPS 2R-15". NASA. Retrieved 26 April 2013.
  60. ↑ "Navstar 59". NASA. Retrieved 26 April 2013.
  61. ↑ "GPS 2R-17". NASA. Retrieved 26 April 2013.
  62. ↑ "GPS 2R-18". NASA. Retrieved 26 April 2013.
  63. ↑ "Navstar 62". NASA. Retrieved 26 April 2013.
  64. ↑ "Navstar 62". NASA. Retrieved 26 April 2013.
  65. ↑ "Navstar 63". NASA. Retrieved 26 April 2013.
  66. ↑ 66.0 66.1 66.2 66.3 "U.S. Air Force Awards Lockheed Martin GPS III Flight Operations Contract" (Press release) Lockheed Martin 2012-05-31

External links