NOTICE ADVISORY TO NAVSTAR USERS (NANU) #031-90043
SUBJ: FORECAST PRN18 AVAILABLE 14 FEB 90 (DAY45)
1. CONDITION: PRN18 IS SCHEDULED TO BE USABLE FOR NAVIGATION AND
FFILB 90 `DAY45L. ALTHOUGH PRN18 WILL BE USABLE FOR NAVIGATION
AND TIMING, THE SATELLITE HAS NOT BEEN DECLARED OPERATIONAL AND
IS UNDER GOING TESTING THAT MAY RESULT IN PRN18 BEING SET
UNUSABLE WITHOUT ADVANCE NOTIFICATION.
2. RECOMMENDED ACTION: ORBITAL ELEMENTS FOR PRN18 ARE AVAILABLE
IN THE BRO ADCAST ALMANAC. USERS MAY BEGIN PLANNING ACTIVITIES
WITH PRN18.
3. POINT OF CONTACT: MAJOR WILLIAM FAUVER AT COMMERCIAL (719)550-
6379 OR AUTOVON 560-6379.