Not that it isn't a good idea, but in about 1000 hours flying with a GNS 430
I've experienced maybe 15 minutes of RAIM "failure", (at least that I've
noticed) and even during those 15 minutes the data was still accurate. In
addition, no failure lasted more than a minute or so.

Michael




"Barry" wrote in message
...
Is there a site that provides online RAIM predictions for the US? I
know
that Flight Service is supposed to be able to provide this, but it
would
be nice to have another source.

A GNS 430/530 will provide it.

Yes, I should have added that I can get it from the receiver (our club
recently installed a GNS 430), but I 'm looking for a source I can use
during preflight.

Barry