SUBJ: GPS STATUS 12 OCT 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
199-90268 251744Z SEP 90 21/13/2 FCST  UPDATE: REPOSITIONING SCHD
209-90275 021802Z OCT 90  PRN19  FCST  UNUSABLE 282/0255-282/2055
210-90278 051145Z OCT 90  PRN9   ADV   UNUSABLE 278/1100-278/1114
211-90279 061600Z OCT 90  PRN11  ADV   UNUSABLE 279/1405-279/1417
212-90280 070700Z OCT 90  PRN13  ADV   UNUSABLE 280/0305-280/0330
213-90282 091931Z OCT 90  PRN12  FCST  UNUSABLE 283/1430-284/0230
214-90282 091932Z OCT 90  PRN3   FCST  UNUSABLE 288/1917-289/1917
215-90283 101447Z OCT 90  PRN6   ADV   UNUSABLE 283/0800-283/0834
216-90284 110230Z OCT 90  PRN12  ADV   UNUSABLE 284/0100-284/0112
3. REMARKS:
A. PRN15 WAS LAUNCHED ON DAY 274 (1 OCT 90) AT 2156 UTC. AN ALMANAC
FOR PRN15 IS EXPECTED TO BE UPLOADED SOMETIME DURING THE LAST WEEK
OF OCTOBER ALTHOUGH THE SATELLITE WILL BE UNUSABLE UNTIL ABOUT DAY
305 (1 NOV 90). AN ADVISORY WILL BE PROVIDED FOLLOWING THE INITIAL
ALMANAC UPLOAD.
B. 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.
C. 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 249/02:56-250/02:56 249/03:26-249/09:39
21    2 OCT 90  STATION KEEPNG 275/00:00-276/00:00 275/00:17-275/09:42
13    4 OCT 90  FINAL MANEUVER 277/15:32-278/15:32 277/16:10-278/01:15
 3   15 OCT 90  FINAL MANEUVER 288/19:17-289/19:17
11   25 OCT 90  FINAL MANEUVER 298/17:08-299/17:08
14    2 NOV 90  FINAL MANEUVER 306/01:08-307/01:08
18   13 NOV 90  SLOW DOWN      317/02:14-318/02:14
 2   19 NOV 90  FINAL MANEUVER 323/09:26-324/09:26 ***CHANGE***
18   10 DEC 90  FINAL MANEUVER 344/00:29-345/00:29
19   19 DEC 90  SLOW DOWN      353/19:04-354/19:04
19   10 JAN 90  FINAL MANEUVER 010/00:14-011/00:14
4. POINT OF CONTACT: MAJ FAUVER AT (719)550-6379.