NOTICE ADVISORY TO NAVSTAR USERS (NANU) #078-92117 SUBJ: PRN6 UNUSABLE 117/0350-117/0403 1. CONDITION: PRN6 (SVN3) WAS UNUSABLE ON DAY 117 (26 APR 92) BEGINNING 0350 UTC UNTIL DAY 117 AT 0403 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: 1LT WINGATE AT (719) 550-6380 OR DSN 560-6380.