NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: GPS System failure
From: Greg R_
Date: 2014 Jun 17, 09:30 -0700
From: Greg R_
Date: 2014 Jun 17, 09:30 -0700
Here's a link to a Wikipedia article on RAIM,
which also includes URLs for a few prediction sites (don't know if the
EUROCONTROL one would have been useful to you or not):
Here in the U.S., the FAA (and other agencies)
issue what are called NOTAMs (Notices to Airmen, the aviation equivalent to
Notices to Mariners) about GPS outages, but I'm not sure if they have coverage
for other areas of the world:
https://www.notams.faa.gov/dinsQueryWeb/displayGPSWAASNotamAction.do
https://www.notams.faa.gov/dinsQueryWeb/displayGPSWAASNotamAction.do
This FAA NOTAM link will let you enter Lat/Long
coordinates, you might give it a try and see if it has any useful info for your
area:
> I am getting DGPS signals here, so there is
correction.
But if the satellite geometry wasn't optimal for
getting a fix at that time, DGPS (WAAS, etc.) really doesn't
matter.
--
GregR
----- Original Message -----From: Jeremy CSent: Tuesday, June 17, 2014 1:26 AMSubject: [NavList] Re: GPS System failureThey are all independent units. So they all have their own antennas/coax/etc. Power was not an issue either.
I am not familiar with RAIM, but if it costs more, I don't have it. All three were also different makes/models. Once the signal was lost, it went into "sky scan" mode and didn't pick up any birds.
I can't see it being interference, or the GLONASS birds would probably have disappeared as well.
I am getting DGPS signals here, so there is correction.
Fortunately I was at anchor and it wasn't too big a deal, but just a bit strange. It isn't so much the loss of positioning, it's the fact that a loss of GPS on here means the loss of comms gear and endless alarms from various equipment.
Jeremy
