NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2012034 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 JUN 2012

1. COORDINATED UNIVERSAL TIME (UTC) WILL SEQUENCE AS FOLLOWS: 30 JUN 2012 23 HOURS 59 MINUTES 59 SECONDS 30 JUN 2012 23 HOURS 59 MINUTES 60 SECONDS 01 JUL 2012 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 15 (GPS IS AHEAD OF UTC BY 15 SECONDS)

   AFTER THE LEAP SECOND GPS-UTC WILL BE 16(GPS WILL BE AHEAD OF UTC BY 16 SECONDS)

3. POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW NAVCEN USCG GOV MILITARY - GPS OPERATIONS CENTER at HTTPS://GPS AFSPC AF MIL/GPSOC, DSN 560-2541, COMM 719-567-2541, gpsoperationscenter@us af mil, HTTPS://GPS AFSPC AF MIL MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-3514, COMM 805-606-3514, JSPOCCOMBATOPS@VANDENBERG AF MIL

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