GNS 430W vs GNS 480

"JD" wrote:
On Jan 1, 5:44 pm, "Roy N5804F"
wrote:
"JD" wrote in
ooglegroups.com...
On Jan 1, 5:17 pm, "Roy N5804F"
wrote:
What do all the aircraft fitted with only dual 430/530's use for
primary enroute navigation under instrument rules ?

What ever they have been using. Could be VOR for example.I do
believe that the updated software for the 480 is required to cure
existing problems found with the 480 during /W certification for the
430/530 units ?

The VOR portion is an integral part of the 430/530 so I would
dispute that the 430/530's are certified for enroute in a normal
certified IFR installation.

Am I wrong again ?

Roy, could just be a time lag in reading/posting, but the 530/430s ARE
NOT currently certified for PRIMARY ENROUTE NAVIGATION, IFR or
otherwise.

I think Roy is correct. The 430/530 *GPS* function is not approved for primary nav, but the built-in VOR
receiver could serve as the required additional means of navigation. The issue is not the box failing, it's
the loss of RAIM integrity with the older TSO C129a GPS boxes. This limitation goes away with the
WAAS approval.

Mike