Originally Posted by Cleared to re-enter
or a C145a or C146 receiver is used during a period when FDE is not predicted to be available....
....very bad luck if you arrive with a 146 needing an approach when there is a RAiM outage.
Check your RAIM prediction before flight. I suspect (only theorising here) that CASA is happy provided RAIM is predicted to be available. Perhaps, after that, if one sat then falls over, RAIM will still be available?
Originally Posted by Alpha
It may be more accurate, but how do you know when you are getting that accuracy?
Because it's a TSOed system. Apart from the alternate requirement, the same GPS that could easily navigate QFF on the Mantl 1 would be used to take him to within 400ft of the ground, sight unseen, out in the boondocks (assuming it's a GPS NPA kit).