NOTICE ADVISORY TO NAVSTAR USERS (NANU) #002-92025
SUBJ: FORECAST: PRN6 ECLIPSE OUTAGE SCHEDULE
1. PRN6 (SVN 3) IS EXPECTED TO BE UNAVAILABLE (L1/L2 OFF) BEGINNING
DAY 364 (30 DEC 91) UNTIL DAY 032 (1 FEB 92) FOR TWO DAILY PERIODS
OF UP TO SEVEN HOURS EACH.
A. 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:
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
B. FURTHER ECLIPSE TIMES THROUGH DAY 032 WILL BE PROVIDED IN A
MESSAGE TO FOLLOW.
2. 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.
3. POC: 1LT INGEGNERI AT (719)550-6379 OR DSN 560-6379.