Someone on the GNS480 yahoo group posted some text this morning from
Garmin Service Bulletin #621, to the effect that the GNS480 does not
comply with the TSO, and that it reverts to TSO C129 type operations,
for example requiring alternate airports to have ground-based
approaches, having alternate means of navigation installed, RAIM
prediction required.

The text as posted says when flight-planning for a LNAV/VNAV or LPV
approach, we should use RAIM prediction from Garmin Prediction Program
006-A0154-02, so it seems it's still possible to use the LNAV/VNAV and
LPV approaches.

The poster says the referenced prediction program is supposed to be
available for download Nov. 1.

I haven't received this Service Bulletin, I'm just going by what was
posted in the yahoo group.

Can anyone confirm they've also received this service bulletin, or have
any more details?

Thanks, Dave