SUBJ: GPS STATUS 06 MAY 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. LONG TERM:
NANU      MSG DATE/TIME   PRN    TYPE  SUMMARY
088-91129 301632Z APR 91  PRN23  FCST  TESTING  129/1530-129/1700
                          PRN12  FCST  TESTING  129/1700-129/2100
090-91140 031610Z MAY 91  PRN2   FCST  MAINT    140/1600-141/1000
B. SHORT TERM:
NANU      MSG DATE/TIME   PRN    TYPE  SUMMARY
087-91119 301350Z APR 91  PRN12  ADV   UNUSABLE 119/1700-119/1710
                          PRN11  ADV   UNUSABLE 119/2300-119/2322
089-91121 011336Z MAY 91  PRN11  ADV   UNUSABLE 121/1014-121/1030
091-91124 061258Z MAY 91  PRN6   ADV   UNUSABLE 124/2201-124/2222
3. SOFTWARE TESTING AT THE MASTER CONTROL STATION IS EXPECTED TO
BE CONDUCTED ON DAY 129 (9 MAY 91). NO OUTAGES ARE EXPECTED;
HOWEVER, SATELLITE COMMANDS AND NAVIGATION MESSAGES WILL BE
BUILT WITH TEST SOFTWARE FOR PRN23 AND PRN12 AS PART OF THIS
TEST. USERS ARE CAUTIONED THAT GPS IS A SYSTEM UNDER DEVELOPMENT
AND SHOULD BE USED WITH CAUTION. (REF: NANU 088)
4. POINTS OF CONTACT:
A. CIVILIAN: US COAST GUARD AT COMMERCIAL (703)866-3806 VOICE OR
(703)866-3890 COMPUTER BBS.
B. MILITARY: 2SCS/DOS MAJ WILLIAM FAUVER AT COMMERCIAL (719)550-6379
OR DSN 560-6379.