SUBJ: GPS STATUS 09 JAN 92
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, 24
   PLANE   : SLOT B3, E1, D2, E3, D3, F3, A4, B2, E2, E4, D1
   CLOCK   :      CS, 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
121-91182 011354Z JUL 91  BLKII  FCST  SA ON    182/0400- UFN
225-92002 270704Z DEC 91  PRN19  FCST  SCHEDULED MAINTENANCE
229-92004 040005Z JAN 92  PRN6   FCST  ECLIPSE OUTAGE SCHEDULE
002-92025 081943Z JAN 92  PRN6   FCST  ECLIPSE OUTAGE SCHEDULE
B. ADVISORIES:
NANU      MSG DATE/TIME   PRN    TYPE  SUMMARY
230-92004 040010Z JAN 92  PRN19  ADV   USABLE   004/0030
001-92008 081448Z JAN 92  PRN13  ADV   UNUSABLE 008/0000-008/0011
003-92009 091416Z JAN 92  PRN3   ADV   UNUSABLE 009/0800-009/0812
3. REMARKS:
A. USERS OF GPS ARE CAUTIONED THAT THE SYSTEM IS NOT YET FULLY
OPERATIONAL. SIGNAL AVAILABILITY AND ACCURACY ARE SUBJECT TO
CHANGE DUE TO AN INCOMPLETE CONSTELLATION AND OPERATIONAL TEST
ACTIVITIES.
B. REF NANU 121 - SELECTIVE AVAILABILITY WAS REACTIVATED AT STANDARD
POSITIONING SERVICE ACCURACY LEVELS ON DAY 182 (01 JUL 91) AT 0400
UTC. VARIATIONS MAY BE SEEN IN THE EFFECT OF SA DURING TESTING, BUT
THE EFFECT SHOULD NOT EXCEED STANDARD POSITIONING SERVICE LEVELS.
THE POINT OF CONTACT IS MAJ ROB WORLEY (719)554-5770 OR DSN
692-5770.
C. REF NANU 229: PRN6 WILL BE SET UNAVAILABLE 30 MINUTES PRIOR TO
THE ECLIPSE TIMES LISTED BELOW AND SHOULD RETURN TO SERVICE WITHIN
FOUR TO SIX HOURS AFTER EXITING ECLIPSE DEPENDING ON THE CONDITION
OF THE VEHICLE. THE FOLLOWING IS A LIST OF PRN 6 ECLIPSE TIMES:
30 DEC 91 DAY 364 1857-1916 UTC
31 DEC 91 DAY 365 0653-0716 AND 1850-1917 UTC
01 JAN 92 DAY 001 0647-0717 AND 1845-1917 UTC
02 JAN 92 DAY 002 0642-0717 AND 1840-1916 UTC
03 JAN 92 DAY 003 0638-0716 AND 1835-1915 UTC
04 JAN 92 DAY 004 0633-0714 AND 1831-1913 UTC
05 JAN 92 DAY 005 0629-0713 AND 1827-1912 UTC
06 JAN 92 DAY 006 0625-0711 AND 1823-1910 UTC
07 JAN 92 DAY 007 0621-0709 AND 1819-1908 UTC
08 JAN 92 DAY 008 0617-0708 AND 1816-1907 UTC
09 JAN 92 DAY 009 0614-0706 AND 1812-1904 UTC
10 JAN 92 DAY 010 0610-0703 AND 1809-1902 UTC
11 JAN 92 DAY 011 0607-0701 AND 1805-1900 UTC
12 JAN 92 DAY 012 0604-0659 AND 1802-1857 UTC
13 JAN 92 DAY 013 0601-0656 AND 1759-1855 UTC => DAY 032 TO FOLLOW.
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 CAPT DODD AT (719)550-6379 OR DSN 560-6379