SIB from 2012 recently got revised. Maybe because “The solar activity follows an eleven year cycle.”, and so does the SIB (almost).
These are interesting:
Reference: https://ad.easa.europa.eu/ad/2012-09R1
Local copy: EASA_SIB_2012_09R1_1_pdf
I wonder how real this is. I have seen loss of GPS signal but it is extremely rare and was clearly due to jamming. You can also lose GPS post-startup if some reason the constellation data was corrupted; might take half an hour to sort out.
I like the multiple words meaning the same thing: availability, continuity, integrity, accuracy 
This guy must be on some govt grant
Peter wrote:
I like the multiple words meaning the same thing: availability, continuity, integrity, accuracy This guy must be on some govt grant
They don’t mean the same thing at all!
Availability – the likelihood that the system is available for use when requested
Continuity – the ability of the system to provide an uninterrupted service
Integrity – the ability of the system to prevent incorrect operation
Accuracy – the (maximal) positioning error
How do you request GPS?
I have not seen loss of GPS due to Solar Storms or CME, but I have seen instances where LPV service is not available. Can still navigate enroute, terminal and LNAV approach, just not LPV.
You turn your GPS receiver on :-)
Peter wrote:
How do you request GPS?
The term “availability” is generic and not specific to GPS. GPS is expected to be available H24. As alioth writes, you turn the receiver on.
