NOTICE ADVISORY TO NAVSTAR USERS (NANU) #090-90122
SUBJ: CHANGE TO REPHASING SCHEDULE PRN2 PRN14 PRN 12
1. CONDITION: FORECAST OUTAGES FOR PRN2, PRN14, AND PRN12 ARE
CHANGED AS FOLLOWS: 1) PRN2 IS EXPECTED TO BE UNUSABLE BEGINNING
DAY 123/1933 UTC (3 MAY 90) FOR UP TO 24 HOURS. 2) PRN14 IS EXPECTED
TO BE UNUSABLE BEGINNING DAY 134/0136 UTC (14 MAY 90) FOR UP TO 24
HOURS. 3) PRN 12 IS EXPECTED TO BE UNUSABLE BEGINNING DAY 140/2056
UTC FOR UP TO 24 HOURS. THE COMPLETE SCHEDULE FOR 1990 FOLLOWS:
PRN  INITIATE  TERMINATE#1 TERMINATE#2 UNUSABLE (DAY/UTC)
11   15 MAR 90 31 OCT 90                74/0335-75/0225   ACTUAL
 3   20 MAR 90 17 OCT 90                79/0700-79/1220   ACTUAL
13   29 MAR 90  3 OCT 90                88/0142-88/1105   ACTUAL
18    7 APR 90 24 NOV 90   8 DEC 90     97/0318-97/1902   ACTUAL
19   11 APR 90                         101/0421-101/0634  RESCHD
19   12 APR 90 31 DEC 90               102/0440-102/1411  ACTUAL
 9   19 APR 90 19 APR 90               109/2126-110/2126  RESCHD
 9   21 APR 90 21 APR 90               111/1035-111/1440  ACTUAL
16   26 APR 90 20 SEP 90               116/0736-116/1509  ACTUAL
 2    3 MAY 90  1 DEC 90               123/1933-124/1933  FORECAST
14   14 MAY 90 10 NOV 90               134/0136-135/0136  FORECAST
12   20 MAY 90 21 MAY 90               140/2056-141/2056  FORECAST
2. RECOMMENDATION: AVOID PLANNING ACTIVITIES WHICH REQUIRE USE OF
SATELLITES FORECAST UNUSABLE. CONFIRM AVAILABILITY OF SATELLITES
PRIOR TO USE.
3. POINT OF CONTACT: MAJ WILLIAM FAUVER AT COMMERCIAL (719)550-6379
OR AUTOVON 560-6379.