"John Bell" wrote in message ...
That's RAIM *prediction*. RAIM is very capable of failing during an
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I am open to corrections if you will explain your reasoning and possibly
site sources.

I believe you understand it, now go back and read your book. It is NOT the
presence of RAIM that distinguishes the IFR GPS's (many non-IFR GPS's
also have it), it's the predictive feature that is required/distinguishing.