SUBJ: GPS STATUS 27 MAR 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
   PLANE   : SLOT B2, E1, D2, F2, F3, A4
   CLOCK   :      CS, CS, CS, RB, 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
038-90052 221705Z FEB 90  PRN8   ADV   L-BANDS ENABLED 51/1615
049-90075 161225Z MAR 90  PRN11  ADV   USABLE 75/0225
050-90079 191629Z MAR 90  ALLSV  FCST  REPHASING PLAN
051-90079 200701Z MAR 90  PRN3   ADV   UNUSABLE 79/0700-79/1220
052-90079 201300Z MAR 90  PRN3   ADV   UNUSABLE 79/0300-79/0330
053-90080 211940Z MAR 90  PRN13  FCST  CHANGE REPHASING TO 28 MAR
054-90081 231605Z MAR 90  PRN13  FCST  CHANGE REPHASING TO 29 MAR
3. REMARKS:
THE SATELLITE REPHASING SCHEDULE FOR 1990 IS TENTATIVE AND WILL
BE UPDATED AS ADDITIONAL INFORMATION IS AVAILABLE. IN GENERAL,
SATELLITES WILL BE UNUSABLE ON INITIATE AND TERMINATE DATES ONLY
AS A RESULT OF REPOSITIONING.
4. SATELLITE REPOSITIONING:
PRN  INITIATE  TERMINATE#1 TERMINATE#2 UNUSABLE (DAY/UTC)
11   15 MAR 90 31 OCT 90                74/0335-75/0225
 3   20 MAR 90 17 OCT 90                79/0700-79/1220
13   29 MAR 90  3 OCT 90                88/0444-
18    7 APR 90 24 NOV 90   8 DEC 90     97/1207-
19   12 APR 90 31 DEC 90               102/0938-
 9   19 APR 90 19 APR 90               109/0928-
16   26 APR 90 20 SEP 90               116/1317-
 2    3 MAY 90  1 DEC 90
14   13 MAY 90 10 NOV 90
12   20 MAY 90 20 MAY 90
ADDITIONAL ALMANACS WILL BE PROVIDED AS REQUIRED UPON A SATELLITE'S
RETURN TO SERVICE.
5. OPERATIONAL ALMANAC:
6. POINT OF CONTACT: MAJ FAUVER AT (719)550-6379