SUBJ: GPS STATUS 13 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
002-92025 081943Z JAN 92  PRN6   FCST  ECLIPSE OUTAGE SCHEDULE
B. ADVISORIES:
NANU      MSG DATE/TIME   PRN    TYPE  SUMMARY
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 025: 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:
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
14 JAN 92 DAY 014 0559-0653 AND 1756-1852 UTC
15 JAN 92 DAY 015 0554-0651 AND 1753-1849 UTC
16 JAN 92 DAY 016 0552-0648 AND 1750-1847 UTC
17 JAN 92 DAY 017 0549-0645 AND 1747-1844 UTC
18 JAN 92 DAY 018 0546-0642 AND 1745-1841 UTC
19 JAN 92 DAY 019 0543-0639 AND 1742-1837 UTC
20 JAN 92 DAY 020 0541-0636 AND 1740-1834 UTC
21 JAN 92 DAY 021 0538-0633 AND 1737-1831 UTC
22 JAN 92 DAY 022 0536-0629 AND 1735-1828 UTC
23 JAN 92 DAY 023 0534-0626 AND 1733-1824 UTC
24 JAN 92 DAY 024 0532-0622 AND 1731-1820 UTC
25 JAN 92 DAY 025 0530-0619 AND 1729-1817 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/DOAI 1LT INGEGNERI AT (719)550-6379 OR DSN 560-6379