530 is out of my price range.

The 430 does output a composite signal. An indicator is not needed with
the GRT EFIS - it talks to the 430 very nicely.

Mike Rapoport wrote:

You might want to consider a 530 instead of a 430. On the 530 you can opt
to show the distance and radial from whatever VOR is tuned. This basically
lets you show two waypoints (one VOR and one GPS) at a time. You can even
have the VOR output to an indicator if the indicator will take composite
input (while in GPS mode). I think that the 430 will also output a
composite signal (VOR (or LOC). The advantage of the 530 is that it gives
you distance and doesn't require another indicator.

Mike
MU-2