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#3
February 3rd 05, 07:58 AM
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Ali Ghorashi wrote: Hello All, What does the following NOTAM mean: GPS 02/001 GPS PRN 26 OTS WEF 0502082100-0502090900 I know it says "GPS Pseudo Random Noise 26 Out of Service" but what are its implications? Does it mean that RAIM is not available during the outage? Thanks, -Ali Maybe, maybe not  It's not at all intuitive what the effect is on RAIM. You can have one or more OTS and still have RAIM. Or you can have none OTS and still lose RAIM (although with a fully healthy constellation, the availability is damn near 100% these days, with 30 operational birds up there now). Some handy links: https://pilotweb.nas.faa.gov/distribution/atcscc.html https://pilotweb.nas.faa.gov/distribution/home.html Regards, Jon 
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