In article ,
Paul Lee wrote:
Thinking of getting a Garmin GNC-430 and installing it in my experimental.
Is an external CDI required for the GNC-430 like it is for the 300XL?

(you mean GNS-430?)

My understanding is that you always need a CDI for IFR certification,
along with certain blinky indicators (which may be provided by the GPS
itself if it displays them (and the GNS-430 does) and it's close enough
to the primary nav instruments). The GNS-430 does have an onscreen
CDI-like display you could use alone in a VFR-only installation.

--
Ben Jackson

http://www.ben.com/