SUBJ: GPS STATUS 22 JUN 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 D1, A3, A2, C2, A1, C1
   CLOCK   :      RB, RB, RB, CS, CS, CS
B. BLOCK II: PRNS  2, 14, 16, 17, 18, 19, 20
   PLANE   : SLOT B2, E1, D2, F2, F3, A4, B3
   CLOCK   :      CS, CS, RB, 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
122-90166 160100Z JUN 90  PRN3   ADV   UNUSABLE 166/2300-166/2340
123-90168 170546Z JUN 90  PRN6   ADV   UNUSABLE 168/0520-168/0545
124-90169 182131Z JUN 90  PRN20  FCST  UNUSABLE 171/1200-171/2100
125-90170 190500Z JUN 90  PRN9   ADV   UNUSABLE 170/0256-170/0330
126-90172 211629Z JUN 90  ALLSV  FCST  TESTING  175/0000-240/0000
127-90172 212010Z JUN 90  PRN12  ADV   UNUSABLE 172/1800-172/1820
3. REMARKS:
A. 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. NOTICE ADVISORY INFORMATION WILL NOT BE AVAILABLE DIRECTLY FROM
THE MASTER CONTROL STATION FOR CIVIL USERS BEGINNING 1 AUG 90. THIS
INFORMATION MAY BE OBTAINED FROM THE US COAST GUARD, THE GENERAL
DYNAMICS GPS BULLETIN BOARD, AND THE US NAVAL OBSERVATORY.
C. SATELLITE REPOSITIONING:
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#1 TERMINATE#2  REMARKS
11   31 OCT 90                FINAL MANEUVER
 3   17 OCT 90                FINAL MANEUVER
13    3 OCT 90                FINAL MANEUVER
18   24 NOV 90   8 DEC 90     24 NOV 90 WILL SLOW THE RATE OF CHANGE
19   31 DEC 90                FINAL MANEUVER
16   20 SEP 90                FINAL MANEUVER
 2    1 DEC 90                FINAL MANEUVER
14   10 NOV 90                FINAL MANEUVER
D. LIMITED SELECTIVE AVAILABILITY TESTING CONDUCTED DURING THE PERIOD
BEGINNING DAY 174 (24 JUN 90) UNTIL DAY 240 (28 AUG 90) SHOULD NOT
DEGRADE NAVIGATION ACCURACY BEYOND LEVELS IN EFFECT SINCE THE
IMPLEMENTATION OF THE STANDARD POSITIONING SERVICE.  HOWEVER, USERS
MAY OBSERVE SOME CHANGES IN DAY-TO-DAY POSITIONING AND NAVIGATION
ACCURACY AS A RESULT OF THIS TEST. POINT OF CONTACT IS MAJOR WYSOCKI
AT USSPACECOM/SPJ3OS, (719)554-2634 OR AUTOVON 692-2634.
4. POINT OF CONTACT: MAJ FAUVER AT (719)550-6379.