, 83 Global Positioning System navigation satellites have been built: 32 are launched and operational, 7 are in reserve or testing, 41 are retired, and 2 were lost during launch. One non-operational prototype satellite was never launched. The next launch is GPS IIIF SV11, with a targeted launch in 2028 on a Vulcan Centaur.

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.

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.

Satellites Satellites by launch date

Satellite Launch (UTC) Carrier rocket Launch site Block No. SVN PRN Slot LOSLength Of Service in days. Includes testing period(s). Status Remarks OPS 5111 23:44 Atlas E/F-SGS-1 VAFB, SLC-3E I 01 04 OPS 5112 10:34 Atlas E/F-SGS-1 VAFB, SLC-3E I 02 07 OPS 5113 00:28 Atlas E/F VAFB, SLC-3E I 03 06 OPS 5114 03:59 Atlas E/F VAFB, SLC-3E I 04 08 Used for testing between February 1990 and May 1990. OPS 5117 23:08 Atlas E/F VAFB, SLC-3E I 05 05 OPS 5118 22:00 Atlas E/F VAFB, SLC-3E I 06 09 N/A(Navstar 7) 01:10 Atlas E/F VAFB, SLC-3E I 07 10 0 Failed to reach orbit. 10:21 Atlas E/F VAFB, SLC-3W I 08 11 USA-1 11:37 Atlas E/F VAFB, SLC-3W I 09 13 Used for testing between February 1994 and June 1994. USA-5 21:41 Atlas E/F VAFB, SLC-3W I 10 12 Used for testing between November 1995 and March 1996. USA-10 02:53 Atlas E/F VAFB, SLC-3W I 11 03 N/A(Prototype) II 0 12 0 Qualification vehicle built by Rockwell International to secure Block II contract; never launched. USA-35 18:30 Delta II 6925-9.5 CCAFS, LC-17A II 14 14 USA-38 22:30 Delta II 6925-9.5 II 13 02 B3 USA-42 05:58 Delta II 6925-9.5 CCAFS, LC-17A II 16 16 USA-47 09:31 Delta II 6925-9.5 CCAFS, LC-17A II 19 19 A5 USA-49 18:10 Delta II 6925-9.5 CCAFS, LC-17B II 17 17 D3 USA-50 22:55 Delta II 6925-9.5 CCAFS, LC-17A II 18 18 USA-54 02:45 Delta II 6925-9.5 CCAFS, LC-17A II 20 20 Decommissioned after twice changing frequency without being commanded to. USA-63 05:39 Delta II 6925-9.5 CCAFS, LC-17A II 21 21 E2 USA-64 21:56 Delta II 6925-9.5 CCAFS, LC-17A II 15 15 D5 Used for testing from November 2006 until March 2007 USA-66 21:39 Delta II 7925-9.5 CCAFS, LC-17A IIA 23 2332 E5 Decommissioned from active service using PRN23 on 13 February 2004. Set usable with PRN32 on 26 February 2008. USA-71 02:32 Delta II 7925-9.5 CCAFS, LC-17A IIA 24 24 D1 USA-79 22:29 Delta II 7925-9.5 CCAFS, LC-17B IIA 25 25 A2 USA-80 03:20 Delta II 7925-9.5 CCAFS, LC-17B IIA 28 28 C2 Retired early, replaced by USA-117. USA-83 09:20 Delta II 7925-9.5 CCAFS, LC-17B IIA 26 26 F5 USA-84 08:57 Delta II 7925-9.5 CCAFS, LC-17A IIA 27 27 A6 USA-85 23:54 Delta II 7925-9.5 CCAFS, LC-17A IIA 32 310130NA F4 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. USA-87 22:16 Delta II 7925-9.5 CCAFS, LC-17B IIA 29 29 F5 USA-88 02:55 Delta II 7925-9.5 CCAFS, LC-17A IIA 22 22 B1 USA-90 03:09 Delta II 7925-9.5 CCAFS, LC-17A IIA 31 31 C3 USA-91 00:07 Delta II 7925-9.5 CCAFS, LC-17A IIA 37 070124 C4 Switched to PRN01 in October 2008 but was unusable. Switched to PRN24 in April 2012 but was unusable. USA-92 13:27 Delta II 7925-9.5 CCAFS, LC-17A IIA 39 09 A5 First satellite to complete initial operational 24-satellite constellation. USA-94 12:38 Delta II 7925-9.5 CCAFS, LC-17B IIA 35 0530 B5 Decommissioned from active service using PRN05 in March 2009. Resumed activity using PRN30 in August 2011. USA-96 17:04 Delta II 7925-9.5 CCAFS, LC-17B IIA 34 0418 D6 Decommissioned from active service using PRN04 in November 2015. Reactivated in March 2018 using PRN18. Decommissioned from active service using PRN18 in October 2019. USA-100 03:40 Delta II 7925-9.5 CCAFS, LC-17A IIA 36 0604 C6 USA-117 00:21 Delta II 7925-9.5 CCAFS, LC-17B IIA 33 03 C5 USA-126 00:50 Delta II 7925-9.5 CCAFS, LC-17A IIA 40 10 E6 USA-128 08:49 Delta II 7925-9.5 CCAFS, LC-17A IIA 30 30 B2 GPS IIR-1 16:28 Delta II 7925-9.5 CCAFS, LC-17A IIR 42 12 0 Failed to reach orbit. USA-132 03:43 CCAFS, LC-17A IIR 43 13 F6 Longest-serving satellite in GPS history. USA-135 00:30 Delta II 7925-9.5 CCAFS, LC-17A IIA 38 08 A3 USA-145 12:51 Delta II 7925-9.5 CCAFS, SLC-17A IIR 46 11 D5 USA-150 01:48 Delta II 7925-9.5 CCAFS, SLC-17A IIR 51 20 E4 USA-151 09:17 Delta II 7925-9.5 CCAFS, SLC-17A IIR 44 2822 B3 NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021035 SUBJ: SVN44 (PRN28) DECOMMISSIONINGNOTICE ADVISORY TO NAVSTAR USERS (NANU) 2024067 SUBJ: SVN44 (PRN22) DECOMMISSIONING 19 DEC 2024 NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2025006 SUBJ: SVN44 (PRN22) USABLE JDAY 022/2302 USA-154 17:14 Delta II 7925-9.5 CCAFS, SLC-17A IIR 41 1422 F5 Retired . Subsequently reactivated on and decommissioned again on 25 January 2023. USA-156 07:55 Delta II 7925-9.5 CCAFS, SLC-17A IIR 54 18 E4 USA-166 18:06 Delta II 7925-9.5 CCAFS, SLC-17B IIR 56 16 B1 USA-168 22:09 Delta II 7925-9.5 CCAFS, SLC-17A IIR 45 21 D3 USA-175 08:05 Delta II 7925-9.5 CCAFS, SLC-17A IIR 47 22 E6 USA-177 17:53 Delta II 7925-9.5 CCAFS, SLC-17B IIR 59 19 C5 USA-178 22:54 Delta II 7925-9.5 CCAFS, SLC-17B IIR 60 23 F4 USA-180 05:39 Delta II 7925-9.5 CCAFS, SLC-17B IIR 61 02 D1 USA-183 03:37 Delta II 7925-9.5 CCAFS, SLC-17A IIRM 53 17 C4 Also known as IIR-14; first to broadcast L2C signal. USA-190 18:50 Delta II 7925-9.5 CCAFS, SLC-17A IIRM 52 31 A2 Also known as IIR-15. USA-192 19:12 Delta II 7925-9.5 CCAFS, SLC-17A IIRM 58 12 B4 Also known as IIR-16; first satellite to complete the full operational 31-satellite constellation. USA-196 12:23 Delta II 7925-9.5 CCAFS, SLC-17A IIRM 55 15 F2 Also known as IIR-17. USA-199 20:04 Delta II 7925-9.5 CCAFS, SLC-17A IIRM 57 29 C1 Also known as IIR-18. USA-201 06:10 Delta II 7925-9.5 CCAFS, SLC-17A IIRM 48 07 A4 Also known as IIR-19. USA-203 08:34 Delta II 7925-9.5 CCAFS, SLC-17A IIRM 49 01273006NA B6 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. USA-206 10:35 Delta II 7925-9.5 CCAFS, SLC-17A IIRM 50 05 E3 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 United States Air Force payload, final launch from SLC-17A, and final Delta II 7925. USA-213 03:00 Delta IV M+ (4,2) CCAFS, SLC-37B IIF 62 25 B2 First to broadcast operational L5 signal. USA-232 06:41 Delta IV M+(4,2) CCAFS, SLC-37B IIF 63 01 D2 USA-239 12:10 Delta IV M+(4,2) CCAFS, SLC-37B IIF 65 24 A1 USA-242 21:38 Atlas V 401 CCAFS, SLC-41 IIF 66 27 C2 USA-248 01:59 Delta IV M+ (4,2) CCAFS, SLC-37B IIF 64 30 A3 USA-251 00:03 Delta IV M+ (4,2) CCAFS, SLC-37B IIF 67 06 D4 USA-256 03:23 Atlas V 401 CCAFS, SLC-41 IIF 68 09 F3 USA-258 17:21 Atlas V 401 CCAFS, SLC-41 IIF 69 03 E1 USA-260 18:36 Delta IV M+ (4,2) CCAFS, SLC-37B IIF 71 26 B5 USA-262 15:36 Atlas V 401 CCAFS, SLC-41 IIF 72 08 C3 USA-265 16:13 Atlas V 401 CCAFS, SLC-41 IIF 73 10 E2 USA-266 13:38 Atlas V 401 CCAFS, SLC-41 IIF 70 32 F1 USA-289Vespucci 13:51 Falcon 9 Block 5 CCAFS, SLC-40 III 74 04 F4 USA-293Magellan 13:06 Delta IV M+ (4,2) CCAFS, SLC-37B III 75 18 D6 USA-304Matthew Henson 20:10:46 Falcon 9 Block 5 CCAFS, SLC-40 III 76 23 E5 Initially nicknamed Columbus.af.mil USA-309Sacagawea 23:24:23 Falcon 9 Block 5 CCAFS, SLC-40 III 77 14 B6 USA-319Neil Armstrong 16:09 Falcon 9 Block 5 CCSFS, SLC-40 III 5 78 11 D5 USA-343Amelia Earhart 12:24 Falcon 9 Block 5 CCSFS, SLC-40 III 6 79 28 A6 USA-440Sally Ride 00:52 Falcon 9 Block 5 CCSFS, SLC-40 III 7 80 01 D2 Originally contracted for launch on United Launch Alliance's Vulcan rocket; re-assigned to a Falcon 9 launch under the name Rapid Response Trailblazer-1 (RRT-1) within 6 months of launch due to Vulcan's unavailability and to demonstrate United States Space Force's ability to undergo responsive satellite mission planning. USA-545Katherine Johnson 17:37 Falcon 9 Block 5 CCSFS, SLC-40 III 8 81 21 E6 USA-581Ellison Onizuka 04:53 Falcon 9 Block 5 CCSFS, SLC-40 III 9 82 20 F5 USA-585Hedy Lamarr 06:53 Falcon 9 Block 5 CCSFS, SLC-40 III 10 83 13 B7

Satellites by block

BlockLaunchedLaunchFailuresTesting/ReserveOperationalRetiredManufacturerRemarksBlock I1110010Rockwell InternationalBlock II90009Rockwell InternationalOne unlaunched prototypeBlock IIA1900019Rockwell InternationalBlock IIR131543Lockheed MartinBlock IIRM80170Lockheed MartinBlock IIF1201110BoeingBlock III1000100Lockheed MartinBlock IIIF00000Lockheed MartinTotal82273241 As of 3 September 2026

Orbital slots (by SVN) Refer to GPS Constellation Status for the most up-to-date information.

+ Slot Plane A B C D E F 1 65 56 57 61 69 70 2 52 62 66 80 73 55 3 64 44 72 50 68 4 48 58 53 67 74 5 83 71 59 78 76 82 6 79 77 75 81

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 , 32 of 32 PRNs are in use. Seven additional satellites are designated as on-orbit spares. PRN0102030405060708091011121314151617181920212223242526272829303132--IIR O S S O OS O IIRM O O O O O O O SIIFS O O OOO OOOO O OIIIO O O O O O O O O O

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