NOTICE ADVISORY TO NAVSTAR USERS (NANU) #059-93077
SUBJ: PRN18 USABLE 077/0554_
REF: NANU 058-93076 (MSG DTG 172315Z MAR 93)
1. CONDITION: PRN18 (SVN18) WAS UNUSABLE ON DAY 076 (17 MAR 93)
BEGINNING 1515 UTC UNTIL DAY 077 AT 0554 UTC.
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: CAPT HUTSELL AT COMMERCIAL (719) 550-6378 OR DSN 560-6378.