Navstar GPS Constellation Status
                                   (12-08-11)

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    E5    90-11-26   Rb2  90-12-10 23:45 UT
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    F2-F  92-07-07   Rb2  92-07-23 19:43 UT
II-15   27 27  1992-058A  22108    A6    92-09-09   Cs4  92-09-30 20:08 UT
II-16   32 01  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    A1    93-06-26   Cs4  93-07-20 12:54 UT
II-22   35 30  1993-054A  22779    B1-F  93-08-30   Rb1  93-09-28 19:29 UT
II-23   34 04  1993-068A  22877    D4    93-10-26   Rb1  93-11-22 18:20 UT
II-24   36 06  1994-016A  23027    C5    94-03-10   Rb1  94-03-28 14:20 UT
II-25   33 03  1996-019A  23833    C2    96-03-28   Cs4  96-04-09 21:17 UT
II-26   40 10  1996-041A  23953    E6    96-07-16   Cs3  96-08-15 15:05 UT
II-27   30 30  1996-056A  24320          96-09-12        96-10-01     11-07-20
II-28   38 08  1997-067A  25030    A3    97-11-06   Cs4  97-12-18 15:24 UT

Block IIR
IIR-1   42 12                            97-01-17        Launch failure
IIR-2   43 13  1997-035A  24876    F3    97-07-23   Rb1  98-01-31 00:57 UT
IIR-3   46 11  1999-055A  25933    D2-F  99-10-07   Rb1  00-01-03 15:02 UT
IIR-4   51 20  2000-025A  26360    E1    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    F1    00-11-10   Rb1  00-12-10 21:12 UT
IIR-7   54 18  2001-004A  26690    E4    01-01-30   Rb1  01-02-15 15:51 UT
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    E2    03-12-21   Rb3  04-01-12 16:50 UT
IIR-11  59 19  2004-009A  28190    C3    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 24  2009-014A  34661          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


Notes
-----
1.  NORAD Catalog Number is also known as U.S. Space Command (USSPACECOM)
    object number and NASA catalog number.
2.  No orbital plane position = satellite decommissioned from operational 
    service.
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".
    See earlier Navstar GPS Constellation Status reports for information on 
    the decommissioning of inactive satellites. The PRN numbers of 
    decommissioned satellites are re-assigned to new satellites.
8.  PRN number of SVN32 was changed from 32 to 01 on 28 January 1993.
9.  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
10. SVN35 and SVN36 are equipped with corner-cube reflectors for
    satellite laser ranging (SLR). SLR tracking of the satellites will permit
    onboard clock errors and satellite ephemeris errors in GPS tracking to be
    differentiated.
11. The constellation is in the 24+3 or "Expandable 24" configuration with
    satellites occupying the fore and aft bifurcated slots in the B, D, and F
    planes. There are currently three official reserve satellites: SVNs 32,
    37, and 49 near slots F1, C1, and B1-F, respectively.
12. SVN24/PRN24 reportedly experienced a reaction wheel failure on 30 September
    2011. The satellite was set unusable at 14:37 UTC (ref. NANU 2011083) and
    stopped transmitting usable L-band signals on that day. The satellite was
    subsequently decommissioned from active service on 4 November 2011 (ref. 
    NANU 2011088). On or around 14 November 2011, SVN24 was boosted into a 
    "graveyard" (disposal) orbit.
13. SVN26/PRN26 active clock was switched from Rb1 to Rb2 on 13 February 2012
    (ref. NANU 2012012 and NGA).
14. SVN27/PRN27 was set unusable on 10 August 2011 at 20:19 UTC, decommissioned
    from active service on the same day and was removed from broadcast almanacs
    (ref. NANU 2011059). However, it continued to transmit L-band signals
    presumably for continued testing. It was subsequently declared still
    operationally useful and was transitioned back into the broadcast almanacs
    on 15 December 2011 after 22:00 UTC (ref. NANU 2011101) and was set usable
    on 16 December 2011 at 22:42 UTC (ref. NANU 2011105).
15. SVN30, as PRN30, at slot B1-F, was set unusable on 13 May 2011 (ref. NANU
    2011042). It was decommissioned from active service on 20 July 2011 (ref.
    NANU 2011048). On or around 22 January 2012, SVN30 was boosted into a 
    "graveyard" (disposal) orbit.
16. SVN32, which had been decommissioned from active service on 17 March
    2008, resumed transmitting L-band signals, still as PRN01, on 24 September
    2008. The satellite was set unhealthy and not included in almanacs (ref.
    NANU 2008111). L-band transmissions were discontinued on 16 October 2008
    (ref. NANU 2008130). It remains a "reserve" satellite near slot F1.
17. SVN35, as PRN05, was set unusable on 26 March 2009 at 13:20 UT. It was
    decommissioned from active service on 26 March 2009 at 20:31 UT (ref. NANU
    2009023). L-band transmissions continued until 8 June 2009 (ref. IGS). On
    about 11 February 2010, the satellite resumed transmitting signals but as 
    PRN25, and was set unhealthy. SVN35 discontinued transmitting L-band
    signals again on 1 March 2010. It was reactivated for tests between 2 June
    2011 and 12 July 2011 but was not set healthy and not included in almanacs.
    SVN35 was again reactivated for service as PRN30 on 16 August 2011 at
    20:45 UT (ref. NANU 2011062). It was moved from its position near slot B4
    to slot B1-F to replace SVN30, arriving at the slot in early January 2012.
18. SVN37, which had been decommissioned from active service on 20 December    
    2007, resumed transmitting L-band signals as PRN01 on 23 October 2008 (ref. 
    NANU 2008131). The satellite stopped transmitting L-band signals on 6
    January 2009 (ref. NANU 2009001). The satellite was not set healthy during
    this period and was not included in almanacs. It remains a "reserve"
    satellite near slot C1.
19. SVN49 was launched on 24 March 2009. L1/L2 transmissions began on 28 March
    2009. L5 transmissions began on 10 April 2009. The satellite remains out
    of service until an L1/L2 satellite multipath issue is resolved. It was
    removed from "active" service and stopped transmitting L-band signals on 6
    May 2011 (ref. NANU 2011039). It was reactivated and transmitted signals as
    PRN24 between 2 February and 14 March 2012 (ref. NANU 2012003). It was
    again reactivated as PRN24 on 9 August 2012 (ref. NANU 2012049). It remains
    a "reserve" satellite near slot B1-F.
20. Constellation plot:
    <http://gge.unb.ca/Resources/GPSConstellationPlot.pdf>.
    Key (at epoch of plot):
    green = healthy; red = unhealthy; orange = reserve satellite
    Healthy/unhealthy satellites identified by PRN code number. Reserve
    satellites identified by (-)SVN.
21. The next scheduled GPS satellite launch is (ref. Spaceflight Now):
    IIF-3  SVN65/PRN24  4 October 2012
22. Compiled by Richard B. Langley, Dept. of Geodesy and Geomatics Engineering,
    University of New Brunswick.