Navstar GPS Constellation Status (18-07-14) Blk NORAD Orbit Launch II PRN Internat. Catalog Plane Date Seq SVN Code ID Number Pos'n (UT) Clock Available/Decommissioned ------------------------------------------------------------------------------- Block I 01 04 1978-020A 10684 78-02-22 78-03-29 85-07-17 02 07 1978-047A 10893 78-05-13 78-07-14 81-07-16 03 06 1978-093A 11054 78-10-06 78-11-13 92-05-18 04 08 1978-112A 11141 78-12-10 79-01-08 89-10-14 05 05 1980-011A 11690 80-02-09 80-02-27 83-11-28 06 09 1980-032A 11783 80-04-26 80-05-16 91-03-06 07 81-12-18 Launch failure 08 11 1983-072A 14189 83-07-14 83-08-10 93-05-04 09 13 1984-059A 15039 84-06-13 84-07-19 94-06-20 10 12 1984-097A 15271 84-09-08 84-10-03 95-11-18 11 03 1985-093A 16129 85-10-09 85-10-30 94-04-13 Block II II-1 14 14 1989-013A 19802 89-02-14 89-04-15 00-04-14 II-2 13 02 1989-044A 20061 89-06-10 89-08-10 04-05-12 II-3 16 16 1989-064A 20185 89-08-18 89-10-14 00-10-13 II-4 19 19 1989-085A 20302 89-10-21 89-11-23 01-09-11 II-5 17 17 1989-097A 20361 89-12-11 90-01-06 05-02-22 II-6 18 18 1990-008A 20452 90-01-24 90-02-14 00-08-18 II-7 20 20 1990-025A 20533 90-03-26 90-04-18 96-05-10 II-8 21 21 1990-068A 20724 90-08-02 90-08-22 03-01-27 II-9 15 15 1990-088A 20830 90-10-01 90-10-15 07-03-14 Block IIA II-10 23 32 1990-103A 20959 90-11-26 90-12-10 16-01-25 II-11 24 24 1991-047A 21552 91-07-04 91-08-30 11-11-04 II-12 25 25 1992-009A 21890 92-02-23 92-03-24 09-12-18 II-13 28 28 1992-019A 21930 92-04-10 92-04-25 97-05 II-14 26 26 1992-039A 22014 92-07-07 92-07-23 15-01-06 II-15 27 30 1992-058A 22108 92-09-09 92-09-30 12-10-06 II-16 32 24 1992-079A 22231 92-11-22 92-12-11 08-03-17 II-17 29 29 1992-089A 22275 92-12-18 93-01-05 07-10-23 II-18 22 22 1993-007A 22446 93-02-03 93-04-04 03-08-06 II-19 31 31 1993-017A 22581 93-03-30 93-04-13 05-10-24 II-20 37 07 1993-032A 22657 93-05-13 93-06-12 07-12-20 II-21 39 09 1993-042A 22700 93-06-26 93-07-20 14-05-19 II-22 35 30 1993-054A 22779 93-08-30 93-09-28 13-05-01 II-23 34 18 1993-068A 22877 D6 93-10-26 Rb1 18-03-20 22:24 UT II-24 36 06 1994-016A 23027 R 94-03-10 94-03-28 14-02-21 II-25 33 03 1996-019A 23833 96-03-28 96-04-09 14-08-02 II-26 40 10 1996-041A 23953 96-07-16 96-08-15 15-07-16 II-27 30 30 1996-056A 24320 96-09-12 96-10-01 11-07-20 II-28 38 08 1997-067A 25030 R 97-11-06 97-12-18 14-10-30 Block IIR IIR-1 42 12 97-01-17 Launch failure IIR-2 43 13 1997-035A 24876 F6 97-07-23 Rb1 98-01-31 00:57 UT IIR-3 46 11 1999-055A 25933 D2-F 99-10-07 Rb3 00-01-03 15:02 UT IIR-4 51 20 2000-025A 26360 E4 00-05-11 Rb1 00-06-01 16:09 UT IIR-5 44 28 2000-040A 26407 B3 00-07-16 Rb2 00-08-17 13:51 UT IIR-6 41 14 2000-071A 26605 F2-F 00-11-10 Rb1 00-12-10 21:12 UT IIR-7 54 18 2001-004A 26690 01-01-30 01-02-15 18-03-05 IIR-8 56 16 2003-005A 27663 B1-A 03-01-29 Rb3 03-02-18 15:53 UT IIR-9 45 21 2003-010A 27704 D3 03-03-31 Rb3 03-04-12 05:27 UT IIR-10 47 22 2003-058A 28129 E6 03-12-21 Rb1 04-01-12 16:50 UT IIR-11 59 19 2004-009A 28190 C5 04-03-20 Rb3 04-04-05 17:06 UT IIR-12 60 23 2004-023A 28361 F4 04-06-23 Rb2 04-07-09 16:07 UT IIR-13 61 02 2004-045A 28474 D1 04-11-06 Rb1 04-11-22 16:23 UT Block IIR-M IIR-M-1 53 17 2005-038A 28874 C4 05-09-26 Rb3 05-12-16 23:30 UT IIR-M-2 52 31 2006-042A 29486 A2 06-09-25 Rb3 06-10-12 22:53 UT IIR-M-3 58 12 2006-052A 29601 B4 06-11-17 Rb3 06-12-13 03:07 UT IIR-M-4 55 15 2007-047A 32260 F2-A 07-10-17 Rb3 07-10-31 22:46 UT IIR-M-5 57 29 2007-062A 32384 C1 07-12-20 Rb3 08-01-02 20:41 UT IIR-M-6 48 07 2008-012A 32711 A4 08-03-15 Rb3 08-03-24 20:08 UT IIR-M-7 49 04 2009-014A 34661 T 09-03-24 11-05-06 IIR-M-8 50 05 2009-043A 35752 E3 09-08-17 Rb1 09-08-27 14:40 UT Block IIF IIF-1 62 25 2010-022A 36585 B2 10-05-28 Rb1 10-08-27 04:10 UT IIF-2 63 01 2011-036A 37753 D2-A 11-07-16 Rb1 11-10-14 19:53 UT IIF-3 65 24 2012-053A 38833 A1 12-10-04 Cs3 12-11-14 00:33 UT IIF-4 66 27 2013-023A 39166 C2 13-05-15 Rb2 13-06-21 19:58 UT IIF-5 64 30 2014-008A 39533 A3 14-02-21 Rb2 14-05-30 18:35 UT IIF-6 67 06 2014-026A 39741 D4 14-05-17 Rb1 14-06-10 17:10 UT IIF-7 68 09 2014-045A 40105 F3 14-08-02 Rb2 14-09-17 20:26 UT IIF-8 69 03 2014-068A 40294 E1 14-10-29 Rb1 14-12-12 21:19 UT IIF-9 71 26 2015-013A 40534 B1-F 15-03-25 Rb1 15-04-20 22:22 UT IIF-10 72 08 2015-033A 40730 C3 15-07-15 Cs3 15-08-12 16:53 UT IIF-11 73 10 2015-062A 41019 E2 15-10-31 Rb1 15-12-09 01:16 UT IIF-12 70 32 2016-007A 41328 F1 16-02-05 Rb1 16-03-09 03:09 UT Notes ----- 1. NORAD Catalog Number is also known as U.S. Space Command (USSPACECOM) object number and (formerly) NASA catalog number. 2. No orbital plane position = satellite decommissioned from operational service. R indicates reserve (residual) satellite. T indicates test satellite. 3. Clock: Rb = Rubidium; Cs = Cesium. 4. Selective Availability (S/A) had been enabled on Block II satellites during part of 1990; S/A off between about 10 August 1990 and 1 July 1991 due to Gulf crisis; standard level re-implemented on 15 November 1991; occasionally off for test and other purposes. S/A was set to 0 on all satellites by presidential order on 2 May 2000 at approximately 04:00 UT. 5. Anti-spoofing (A-S) was activated on 31 January 1994 at 00:00 UT on all Block II satellites (ref. NANU 050-94042); occasionally off for test and other purposes. 6. Availability dates: These are the dates when a particular satellite is first set healthy following launch. Typically these dates are days to weeks after the L-band transmitters first become active. Sometimes a satellite is retired and then brought back into service. The "available" date remains that of the satellite's initial availability after launch. 7. Decommissioning dates: The decommissioning date for PRN06/SVN03 is the date of termination of operations of this satellite (ref. USNO) and is about 3 weeks later than other published dates for "deactivation". Decommissioning dates are typically those announced by the GPS Directorate. Although marked unhealthy and removed from broadcast almanacs, some decommissioned satellites may continue to transmit signals for a period of time. See earlier Navstar GPS Constellation Status reports for information on the decommissioning of currently inactive satellites. The PRN numbers of decommissioned satellites are re-assigned to new satellites. 8. Note that over the years, certain PRN codes have been reused by different satellites. In particular, several satellites have used PRN01 codes at different times, either operationally or for tests: SVN32 92-12-11 to 08-03-17 and 08-09-24 to 08-10-16 SVN37 08-10-23 to 09-01-06 SVN49 09-03-28 to 11-05-06 SVN35 11-06-02 to 11-07-12 SVN63 11-07-20 continues PRN codes listed in the tables are either the current codes for active satellites (as of the date of the status report) or the last used code for decommissioned satellites when they were still operational. 9. SVN35 and SVN36 are equipped with corner-cube reflectors for satellite laser ranging (SLR). SLR tracking of the satellites permitted onboard clock errors and satellite ephemeris errors in GPS tracking to be differentiated. 10. The constellation is in the 24+3 or "Expandable 24" configuration with satellites occupying the fore (-F) and aft (-A) bifurcated slots in the B, D, and F planes. In other constellation listings, B1-A, B1-F, D2-A, D2-F, F2-A, and F2-F are known as B1, B5, D2, D5, F2, and F5, respectively. There are currently two reserve satellites: SVNs 36 and 38 as well as one test satellite, SVN 49, currently near slots C2, A2, and B1-F, respectively. 11. SVN34 was set unusable on 2 November 2015 at 22:22 UT and removed from the active constellation on 3 November 2015 at 22:09 UT (ref. NANUs 2015089 and 2015091). SVN34 stopped transmitting L-band signals as PRN04 on 9 November 2015 (ref. IGS monitoring). It transmitted L-band signals as PRN04 between 9 December 2016 and 3 January 2017 (ref. NANU 2016072 and CODE). It was not set healthy and not included in broadcast almanacs. It had been a "reserve" satellite, but was reactivated to replace SVN54/PRN18. It began transmitting L-band signals as PRN18 on 8 March 2018 (ref. IGS monitoring) and was set usable on 20 March 2018 (ref. NANU 2018015). 12. SVN36 was removed from the active GPS constellation on 21 February 2014 (ref. NANU 2014019). It is now a "reserve" satellite, located near slot C2. SVN36 temporarily transmitted L-band signals as PRN10 between 17 September and 16 October 2015 inclusive (ref. IGS monitoring). It was set unhealthy and not included in broadcast almanacs (ref. NANU 2015080). SVN36 transmitted L-band signals as PRN04 between 20 July and 28 November 2017 (ref. NANU 2017070 and IGS monitoring). It was not set healthy and not included in broadcast almanacs. 13. SVN38 was removed from the active GPS constellation on 30 October 2014 (ref. NANU 2014083). Although set unhealthy, it continued to transmit L-band signals as PRN08. On 7 January 2015, it was transitioned into the broadcast almanacs but remained set unhealthy (ref. NANU 2015003). SVN38 was removed from the constellation on 26 March 2015 (ref. NANU 2015021). It stopped transmitting L-band signals on 14 April 2015 (ref. IGS monitoring). It was reactivated and transmitted L-band signals as PRN04 between 19 May and 14 July 2017. It was set unhealthy and not included in broadcast almanacs (ref. NANU 2017042 and IGS monitoring). It remains a "reserve" satellite, located near slot A2. 14. SVN49 is periodically reactivated for tests. It transmitted L-band signals as PRN04 from 3 February 2016 until 13 September 2016 (ref. NANU 2016009, IGS monitoring, and DLR) and again as PRN04 from 5 January until 12 May 2017 (ref. NANU 2017001 and CODE) and again began transmitting L-band signals as PRN04 beginning on 1 December 2017 (ref. NANU 2017122 and CODE). It was not set healthy and was not included in broadcast almanacs for any of these activations. It remains a "test" satellite, located near slot B1-F. 15. SVN51/PRN20 was previously in slot E7 (between E3 and E4). Due to limitations in GPS orbit nomenclature, slot E7 was also referred to as slot B6 in some official publications. Its slot designation has been changed to E4 with the decommissioning of SVN54. 16. Constellation plot: . Key (at epoch of plot): green = healthy; red = unhealthy; orange = reserve/test satellite Healthy/unhealthy satellites identified by PRN code number. Reserve satellites identified by (-)SVN. 17. The next GPS satellite to be launched is the first Block III satellite (SVN74) and is planned for NET October 2018. 18. Compiled by Richard B. Langley, Dept. of Geodesy and Geomatics Engineering, University of New Brunswick.