wrote:

Yes there is. RAIM provided integrity. As long as no signal error
exists (vast majority of the time) then your assertion is basically
correct.

Ron Lee

If I have my Garmin 296 on a roof mount antenna and I check its distance
to a VOR station against my DME, then do an IAP within 30 minutes, or
so, of that check with 6, or more satellites in view, I have essentially
as much integrity as an IFR box with RAIM.

That is incorrect. You have no assurance that there was not a signal
failure in that 30 minutes. The odds are in your favor but in no way
do you have the same integrity protection as an IFR GPS unit.

Ron Lee