"Scott Lowrey" wrote in message news:XC4fb.482201$Oz4.324450@rwcrnsc54...
[snip]
To quote Jeppesen:

"In practice, the easiest and most reliable way to ensure that you will have
RAIM for the approach at your ETA is to specifically request GPS RAIM
availability from your FSS weather briefer."

Still, I would echo the question: where do the briefers get this info?

From the output of a prediction model which is run (at least once)
daily at the NOCC.

-Scott

Regards,
Jon