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Author: Larry Hothem<br>
<br>
For your information, forwarding a copy of the following notice from
the Civil GPS Service Information Center (CGSIC):<br>
<br>
******************************************************************************************************************************<br>
<br>
<b>The Air Force has released notice of GPS CNAV activation
beginning 28 April, 2014 </b><br>
<br>
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2014038 NANU TYPE: GENERAL <br>
<br>
*** GENERAL MESSAGE TO ALL GPS USERS *** <br>
<br>
The purpose of this notification is to inform users of an upcoming
event related to the GPS satellite constellation. <br>
<br>
Air Force Space Command will be implementing CNAV messages on the
GPS L2C and L5 signals beginning J118/1430z with updates from the
control segment approximately twice per week. The message populated
signal content will include Broadcast Message Types (MT) 10, 11, 12,
30, and 33. There are no planned GPS satellite outages or
degradations for this activity. <br>
<br>
L2C and L5 CNAV messages should be transparent to GPS receivers that
do not process L2C or L5 CNAV messages. These populated signals are
intended to facilitate user familiarization and development of
compatible user equipment. <br>
<br>
NOTE: Until further notice, the L2C and L5 signals are considered
pre-operational. A pre-operational signal means the availability and
other characteristics of the broadcast signal may not comply with
all requirements of the relevant Interface Specifications and should
be employed at the users' own risk. Therefore these signals should
not be used for safety-of-life or other critical purposes. <br>
<br>
Any military or civil users who encounter user equipment problems
following message population of the L2C and L5 signals should
contact the applicable POCs identified below as soon as possible.
Aviation users should file reports consistent with FAA-approved
procedures. <br>
<br>
*** GENERAL MESSAGE TO ALL GPS USERS *** <br>
<br>
POC: CIVILIAN - NAVCEN AT 703-313-5900,
<a class="moz-txt-link-freetext" href="HTTP://WWW.NAVCEN.USCG.GOV">HTTP://WWW.NAVCEN.USCG.GOV</a><br>
MILITARY - GPS OPERATIONS CENTER at
<a class="moz-txt-link-freetext" href="HTTPS://GPS.AFSPC.AF.MIL/GPSOC">HTTPS://GPS.AFSPC.AF.MIL/GPSOC</a>, DSN 560-2541,<br>
COMM 719-567-2541, <a class="moz-txt-link-abbreviated" href="mailto:gpsoperationscenter@us.af.mil">gpsoperationscenter@us.af.mil</a>,
<a class="moz-txt-link-freetext" href="HTTPS://GPS.AFSPC.AF.MIL">HTTPS://GPS.AFSPC.AF.MIL</a> <br>
MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN
276-3514, <br>
COMM 805-606-3514, <a class="moz-txt-link-abbreviated" href="mailto:JSPOCCOMBATOPS@VANDENBERG.AF.MIL">JSPOCCOMBATOPS@VANDENBERG.AF.MIL</a> To
unsubscribe, visit:
<a class="moz-txt-link-freetext" href="http://www.navcen.uscg.gov/?pageName=listServerForm">http://www.navcen.uscg.gov/?pageName=listServerForm</a><br>
<br>
V/R<br>
Rick Hamilton<br>
CGSIC Executive Secretariat<br>
GPS Information Analysis Team Lead<br>
USCG Navigation Center<br>
703-313-5930<br>
<br>
<br>
<br>
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