NOTICE ADVISORY TO NAVSTAR USERS (NANU) #005-92021
SUBJ: FORECAST OUTAGE PRN21 DAY 021/1745 UTC FOR UP TO 8 HOURS
1. CONDITION: PRN21 (SVN21) IS EXPECTED TO BE UNUSABLE ON DAY
021 (21 JAN 92) BEGINNING 1745 UTC FOR UP TO 8 HOURS DUE TO
SCHEDULED MAINTENANCE. HISTORICALLY, THE MINIMUM TIME FOR THIS TYPE
OF OUTAGE IS 5 HOURS.
2. AFFECTED AREAS: HAWAII AND CENTRAL PACIFIC REGION, NORTH AND SOUTH
AMERICA, ATLANTIC OCEAN, EUROPE, SOUTHERN AFRICA.
3. THIS SCHEDULED MAINTENANCE WILL REPOSITION PRN21 AND USERS ARE
ADVISED TO UPDATE ALMANACS FOLLOWING THE EVENT.
4. 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.
5. POC: LT WINGATE (USA) AT (719) 550-6379 OR DSN 560-6379.