Jonathan Goodish wrote:

Not to mention that you only get NEXRAD and METARs on the 430/530
displays, unless Garmin has changed something recently.

What I was told a number of months back is that, once a 430/530 is upgraded
for WAAS, the additional WX features of the XM feed will be supported.
Whether this was ever actually, or still is, true is unknown.

But it does make sense to me, in that the WAAS upgrade is a significant
system improvement from what I've read even ignoring the actual WAAS
service. Perhaps the 430/530 haven't the power to handle/display all that
the GDL69 can provide w/o that upgrade.

- Andrew