NOTICE ADVISORY TO NAVSTAR USERS (NANU) #088-91129
SUBJ: FORECAST TESTING: PRN23 129/1530-1700 AND PRN12 129/1700-2100
1. FORECAST: SOFTWARE TESTING AT THE MASTER CONTROL STATION IS
EXPECTED TO BE CONDUCTED ON DAY 129 (9 MAY 91). NO OUTAGES ARE
EXPECTED; HOWEVER, SATELLITE COMMANDS AND NAVIGATION MESSAGES WILL
BE BUILT WITH TEST SOFTWARE FOR PRN23 AND PRN12 AS PART OF THIS
TEST. USERS ARE CAUTIONED THAT GPS IS A SYSTEM UNDER DEVELOPMENT
AND SHOULD BE USED WITH CAUTION.
A. PRN23 (MCS: SVN23) WILL BE UPLOADED USING TEST SOFTWARE ON DAY
129 DURING THE PERIOD BEGINNING 1530 UTC UNTIL DAY 129 AT 1700
UTC. ALMANAC HEALTH IS EXPECTED TO REMAIN USABLE DURING THE TEST.
B. PRN12 (MCS: SVN10) WILL BE UPLOADED USING TEST SOFTWARE ON DAY
129 DURING THE PERIOD BEGINNING 1700 UTC UNTIL DAY 129 AT 2100
UTC. ALMANAC HEALTH IS EXPECTED TO REMAIN USABLE DURING THE TEST.
2. RECOMMENDATION: CONFIRM AVAILABILITY OF SATELLITES PRIOR TO USE.
3. POINT OF CONTACT: MAJ WILLIAM FAUVER AT COMMERCIAL (719)550-6379
OR DSN 560-6379.