NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2008141
SUBJ: LEAP SECOND
1. CONDITION: THE INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS
SERVICE (IERS) HAS ANNOUNCED THE INTRODUCTION OF A LEAP SECOND TO
OCCUR AT THE END OF DEC 2008

2. COORDINATED UNIVERSAL TIME (UTC) WILL SEQUENCE AS FOLLOWS:
31 DEC 2008 23 HOURS 59 MINUTES 59 SECONDS
31 DEC 2008 23 HOURS 59 MINUTES 60 SECONDS
01 JAN 2009 00 HOURS 00 MINUTES 00 SECONDS

3. FOR GPS, AS WITH PREVIOUS LEAP SECOND UPDATES, THE UTC DATA IN
THE NAVIGATION MESSAGE WILL CHANGE IN ACCORDANCE
WITH IS-GPS-200.
BEFORE THE LEAP SECOND
GPS-UTC IS 14 (GPS IS AHEAD OF UTC BY 14 SECONDS)

AFTER THE LEAP SECOND
GPS-UTC WILL BE 15 (GPS WILL BE AHEAD OF UTC BY 15 SECONDS)

4. POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
MILITARY - GPS OPERATIONS CENTER AT
HTTP://gps.afspc.af.mil/GPSOC, DSN 560-2541,
COMM 719-567-2493, GPS@SCHRIEVER.AF.MIL,
HTTP://gps.afspc.af.mil/GPS
MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-
9994.COMM 805-606-9994.
JSPOCCOMBATOPS@VANDENBERG.AF.MIL