They can't point official fingers. That's why. Ask you vendor if they need firmware upgrades to comply in this aspect.
Cheers, Magnus On 05/16/2014 12:39 AM, [email protected] wrote:
It would be good to understand which receivers are adversely affected by this.. the USCG did not list affected vendors/devices.. In a message dated 5/15/2014 15:19:51 Pacific Daylight Time, [email protected] writes: Hi fellow time-nuts, I think this message is interesting. It shows that some receiver vendors have been cheating on an important detail, ignoring the health status and being confused as a result. Cheers, Magnus -------- Original Message -------- Subject: CGSIC: Known Problem With Certain GPS Devices Date: Thu, 15 May 2014 21:20:23 +0000 From: Civil Global Positioning System Service Interface Committee (CGSIC) <[email protected]> Reply-To: [email protected] To: [email protected] <[email protected]> All CGSIC: May 15, 2014 Recently, many GPS users have reported intermittent GPS outages in their devices. After investigating, the U.S. government has linked the problem to flawed processing of GPS satellite data within certain GPS receiver chipsets. The GPS satellite service continues to function as designed and is fully operational and available worldwide. The problem affects only user equipment that erroneously ignores the satellite health status information broadcast from every GPS satellite. The problem is not related to the April 28, 2014, activation of civil navigation messages on the GPS L2C and L5 signals. Since March 15, 2014, the Air Force has been conducting functional checkout on a GPS satellite, designated Space Vehicle Number (SVN) 64. SVN 64 broadcasts a data message that clearly indicates SVN 64 is unusable for navigation. Nevertheless, the U.S. government has confirmed that certain GPS receivers are using data from SVN 64, in violation of GPS interface specifications, resulting in outages or corrupted, inaccurate position calculations. The Air Force testing is scheduled to end in mid-May 2014 at which time SVN 64 will begin normal operation. At that point, these problems may stop occurring. Meanwhile, the U.S. government urges all GPS device makers to review their products for compliance with the GPS interface specifications, and if necessary, to issue software/firmware updates to users as soon as possible. View specifications http://www.gps.gov/technical/icwg/ Users experiencing GPS outages should check with their device manufacturers for available software/firmware updates. In addition, any civil user seeing unusual behavior in GPS user equipment should report it to the U.S. Coast Guard Navigation Center (NAVCEN). Aviation users should file reports consistent with FAA-approved procedures. Military users seeing unusual behavior should report it the GPS Operations Center (GPSOC). Please direct any civil user questions to NAVCEN at (703) 313-5900, http://www.navcen.uscg.gov Please direct any military user questions to the GPSOC at (719) 567-2541, DSN: 560-2541, [email protected] https://gps.afspc.af.mil Military alternate: Joint Space Operations Center, (805) 606-3514, DSN: 276-3514, [email protected] ---- See also: Technical explanation for device makers (PDF) http://www.navcen.uscg.gov/pdf/gps/GPSOC_PRN 30_Notice.pdf V/R Rick Hamilton CGSIC Executive Secretariat GPS Information Analysis Team Lead USCG Navigation Center 703-313-5930 _______________________________________________ CGSIC one-way mailing list Unsubscribe: http://cgls.uscg.mil/mailman/listinfo/cgsic If you would like to report abuse of the CGLS listserv please send an email to: [email protected] _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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