SUBJ: GPS STATUS 27 JUN 91
1. SATELLITES, PLANES AND CLOCKS (CS=CESIUM RB=RUBIDIUM):
A. BLOCK I : PRNS  3,  6, 11, 12, 13
   PLANE   : SLOT C4, A3, C3, A1, C1
   CLOCK   :      RB, RB, CS, CS, CS
B. BLOCK II: PRNS  2, 14, 15, 16, 17, 18, 19, 20, 21, 23
   PLANE   : SLOT B3, E1, D2, E3, D3, F3, A4, B2, E2, E4
   CLOCK   :      CS, CS, CS, CS, CS, CS, CS, CS, CS, CS
2. CURRENT ADVISORIES (ADV) AND FORECASTS (FCST):
INFORMATION IS REPEATED FOR SEVEN DAYS AFTER EVENT CONCLUDES.
A. FORECASTS:
NANU      MSG DATE/TIME   PRN    TYPE  SUMMARY
115-91176 191540Z JUN 91  PRN14  FCST  UNUSABLE 176/0600  +12 HRS
117-91177 202122Z JUN 91  PRN14  FCST  UNUSABLE 177/0600  +12 HRS
119-91177 262023Z JUN 91  BLKII  FCST  SPS REACTIVATION FORECAST
B. ADVISORIES:
NANU      MSG DATE/TIME   PRN    TYPE  SUMMARY
118-91175 241415Z JUN 91  PRN6   ADV   UNUSABLE 175/1220      UFN
3. REMARKS:
A. REF NANU 118 - PRN6 WAS SET UNUSABLE ON DAY 175 (24 JUN 91) AT
APPROXIMATELY 1220 UTC. THE OUTAGE WAS NOT SCHEDULED AND ALL EFFORTS
ARE BEING MADE TO RESTORE PRN6 TO SERVICE. AN ESTIMATED TIME OR DATE
WHEN PRN6 WILL BE USABLE IS NOT AVAILABLE AT THIS TIME.
B. REF NANU 119 - USSPACECOM HAS ANNOUNCED THE INTENTION OF
REACTIVATING SELECTIVE AVAILABILITY AT STANDARD POSITIONING SERVICE
ACCURACY LEVELS WITHIN A FEW DAYS. THE POINT OF CONTACT IS MAJOR JOE
WYSOCKI (719)554-5770 OR DSN 692-5770.
4. POINTS OF CONTACT:
A. CIVILIAN: US COAST GUARD AT COMMERCIAL (703)866-3806 VOICE OR
(703)866-3890 COMPUTER BBS.
B. MILITARY: 2SCS/DOCI MAJ WILLIAM FAUVER AT (719)550-6379 OR DSN
560-6379.