SUBJ: GPS STATUS 09 NOV 90
1. SATELLITES, PLANES AND CLOCKS (CS=CESIUM RB=RUBIDIUM):
SLOTS MAY NOT BE FINAL UNTIL AFTER 21-SATELLITE REPHASING.
A. BLOCK I : PRNS  3,  6,  9, 11, 12, 13
   PLANE   : SLOT C4, A3, A2, C3, A1, C1
   CLOCK   :      RB, RB, RB, CS, CS, CS
B. BLOCK II: PRNS  2, 14, 16, 17, 18, 19, 20, 21, 15
   PLANE   : SLOT B3, E1, E3, D3, F3, A4, B2, E2, D2
   CLOCK   :      CS, CS, RB, CS, CS, CS, CS, CS, CS
2. CURRENT ADVISORIES (ADV) AND FORECASTS (FCST):
INFORMATION IS REPEATED FOR SEVEN DAYS AFTER EVENT CONCLUDES
NANU      MSG DATE/TIME   PRN    TYPE  SUMMARY
231-90306 021657Z NOV 90  PRN2   FCST  REVOKE NANU# 229-90303
232-90306 022103Z NOV 90  PRN6   ADV   UNUSABLE 306/2008-306/2113
233-90310 061045Z NOV 90  PRN6   ADV   UNUSABLE 310/0925-310/0939
234-90311 071330Z NOV 90  PRN9   ADV   UNUSABLE 311/0900-311/0934
235-90311 071945Z NOV 90  PRN6   ADV   UNUSABLE 311/1741-311/1800
236-90311 072200Z NOV 90  PRN6   ADV   UNUSABLE 311/2100-311/2140
237-90312 081200Z NOV 90  PRN6   ADV   UNUSABLE 312/0712-312/0725
238-90313 091442Z NOV 90  PRN18  FCST  UNUSABLE 317/0214-318/0214
3. REMARKS:
A. REF NANU #057-90088: IMPLEMENTATION OF STANDARD POSITIONING
SERVICE: THE CURRENT GPS CONSTELLATION BEGAN BROADCASTING NAVIGATION
MESSAGES AT ACCURACY LEVELS CONSISTENT WITH STANDARD POSITIONING
SERVICE ON 25 MAR 90. GPS IS NOT EXPECTED TO BE DECLARED FULLY
OPERATIONAL UNTIL 1993. ANY GPS USERS ARE OPERATING AT THEIR OWN
RISK.
B. REF NANU #218-90288: LAUNCH INFORMATION: PRN15 WAS LAUNCHED ON
DAY 274 (1 OCT 90) AT 2156 UTC. PRN15 WAS SET USABLE ON DAY 288
(15 OCT 90)  AT APPROXIMATELY 0039 UTC. ALTHOUGH PRN15 IS USABLE
FOR NAVIGATION AND TIMING, THE SATELLITE HAS NOT BEEN DECLARED
OPERATIONAL AND IS UNDERGOING TESTING THAT MAY RESULT IN PRN15
BEING SET UNUSABLE WITHOUT ADVANCE NOTIFICATION.
C. REF NANU #225-90297: UPDATE TO REPOSITIONING SCHEDULE:
THE SATELLITES WHICH BEGAN REPOSITIONING EARLIER THIS YEAR WILL
CONTINUE GRADUAL CHANGES TO THEIR ORBITAL POSITIONS UNTIL
REPOSITIONING TERMINATE DATES AS SHOWN BELOW:
PRN  TERMINATE  TENTATIVE OUTAGE WINDOWS (UTC)     ACTUAL
16    6 SEP 90  FINAL MANEUVER 249/0256-250/0256 249/0326-249/0939
21    2 OCT 90  STATION KEEPNG 275/0000-276/0000 275/0017-275/0942
13    4 OCT 90  FINAL MANEUVER 277/1532-278/1532 277/1610-278/0115
 3   15 OCT 90  FINAL MANEUVER 288/1917-289/1917 288/1925-289/0330
11   26 OCT 90  FINAL MANEUVER 299/1708-300/1708 299/1740-299/2345
14   30 OCT 90  FINAL MANEUVER 303/0108-304/0108 303/0156-303/0713
18   13 NOV 90  SLOW DOWN      317/0214-318/0214
 2   19 NOV 90  FINAL MANEUVER 323/0926-324/0926
18   10 DEC 90  FINAL MANEUVER 344/0029-345/0029
19   19 DEC 90  SLOW DOWN      353/1904-354/1904
19   10 JAN 90  FINAL MANEUVER 010/0014-011/0014
D. REF NANU #230-90305: PRN20 UNRELIABLE: ON DAY 304 (31 OCT 90)
FROM 0600 TO 1000 UTC, PRN20 WAS HEALTHY HOWEVER NAVIGATION AND
TIMING DATA WAS UNRELIABLE. USER RANGE ACCURACY ESTIMATES WERE
NOT VALID AND TIME AND POSITIONING DATA SHOULD BE USED WITH CAUTION.
E. REF NANU #231-90306: CANCEL PRN2 OUTAGE: THE PRN2 OUTAGE FORECAST
FOR DAY 309 HAS BEEN CANCELED. NANU #229-90303 IS REVOKED.
4. POINT OF CONTACT: MAJ FAUVER AT (719)550-6379.