The Air Force Second Space Operations Squadron has issued a Notice Advisory to Navstar Users (NANU) relating to the upcoming Leap Second insertion. GPS users are encouraged to please report operational challenges you experience with the Leap Second insertion to the United States Coast Guard Navigation Center (NAVCEN), via the NAVCEN Website, http://www.navcen.uscg.gov/ under "Report a GPS Problem."
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2015039
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 2015.
2. COORDINATED UNIVERSAL TIME (UTC) WILL SEQUENCE AS FOLLOWS:
30 JUN 2015 23 HOURS 59 MINUTES 59 SECONDS
30 JUN 2015 23 HOURS 59 MINUTES 60 SECONDS
01 JUL 2015 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 16 (GPS IS AHEAD OF UTC BY 16 SECONDS)
AFTER THE LEAP SECOND
GPS-UTC WILL BE 17 (GPS WILL BE AHEAD OF UTC BY 17 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