The GPS program has released its NANU announcing the upcoming Leap Second at the end of June.
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
2. 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
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 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)
4. 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