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

1. 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

2. 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)

3. 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

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