NOTICE ADVISORY TO NAVSTAR USERS (NANU) #012-92031
SUBJ: PRN13 UNUSABLE 031/1100-031/1114
1. CONDITION: PRN13 (SVN09) WAS UNUSABLE ON DAY 031 (31 JAN 91)
BEGINNING 1100 UTC UNTIL DAY 031 AT 1114 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: LT INGEGNERI AT COMMERCIAL (719) 550-6379 OR DSN 560-6379.