GIAC GPS Interagency Advisory Council

Dear GIAC,

This message is being sent on behalf of Charlie Challstrom, Chair, GIAC.

This message is informational. While NANU's are not normally distributed through GIAC -- this involves a 48 hr. test of a slightly different protocol on setting health bits. No impact is expected, but please use the NAVCEN if a problem is encountered.

Thanks!

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*********NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2002075
SUBJ: SVN23 (PRN23) FORECAST OUTAGE RESCHEDULED

1. NANU NUMBER: 2002075
NANU DTG: 312209Z MAY 2002
NANU Type: FCSTRESCD
REFERENCE NANU: 2002072
REF NANU DTG: 241650Z MAY 2002
SVN: 23
PRN: 23
START JDAY: 156
START TIME ZULU: 1600
START CALENDER DATE:Wednesday, June 05, 2002
STOP JDAY: 158
STOP TIME ZULU: 1600
STOP CALENDER DATE: 07 JUN 2002
2. CONDITION: GPS SATELLITE SVN23 (PRN23) WILL BE UNUSABLE ON JDAY 156 (05 JUN 2002) BEGINNING 1600 ZULU UNTIL JDAY 158 (07 JUN 2002) ENDING 1600 ZULU. PLEASE REFERENCE NANU NUMBER 2002072 DTG 241650Z MAY 2002 FOR THE ORIGINAL OUTAGE TIME.

3. POC: CIVILIAN - NAVCEN AT (703)313-5900, HTTP://WWW.NAVCEN.USCG.GOV MILITARY - GPS Support Center, DSN 560-2541,
COMM 719-567-6616, GPS@SCHRIEVER.AF.MIL, HTTP://WWW.SCHRIEVER.AF.MIL/GPS

2002078------------------------
*** GENERAL MESSAGE TO ALL GPS USERS ***
REGARDING NANU 2002075, PRN 23'S HEALTH BIT WILL BE SET TO '11111.' FOR THIS 48 HOUR PERIOD, THE US COAST GUARD (USCG) NAVIGATION CENTER (NAVCEN) IS THE FEEDBACK PATHWAY FOR ALL CIVIL GPS USERS, WITH THE EXCEPTION OF
AVIATION USERS. THE FEDERAL AVIATION ADMINISTRATION (FAA) NATIONAL OPERATIONS CONTROL CENTER (NOCC) IS THE FEEDBACK PATHWAY FOR CIVIL AVIATION GPS USERS.

FOR THIS PERIOD, THE GPS SUPPORT CENTER (GSC) WILL OPERATE 24/7 AND SERVE AS THE SPACEAF FEEDBACK POC FOR THE NAVCEN AND NOCC. THE MILITARY USERS WILL PROVIDE FEEDBACK THROUGH THE USSPACECOM SPOC AND/OR THE SPACEAF AOC.

THE NAVCEN AND NOCC HAVE STANDARD FORMATS (TO INCLUDE SPECIFICS OF LOCATION, RECEIVER BEHAVIOR, USER ACTIONS, AND DIAGNOSTIC DATA THAT MAY BE AVAILABLE, ETC.) FOR REPORTING GPS PROBLEMS, ANOMALIES, AND OUTAGES. THESE FORMATS WILL PROVIDE SUFFICIENT INFORMATION FOR REPORTING CIVIL IMPACTS.

ROUTE ANY OTHER FEEDBACK THROUGH SPACEAF AOC AT COMMERCIAL (805) 606-9994 OR DSN 276-9994.

*** GENERAL MESSAGE TO ALL GPS USERS ***
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for information write:
GPS INTERAGENCY ADVISORY COUNCIL
FEDERAL GEODETIC CONTROL SUBCOMMITTEE
NOAA, National Geodetic Survey, N/NGS
1315 East-West Highway, Room 8657
Silver Spring, Maryland 20910-3282