In article ,
"G.R. Patterson III" wrote:

Roy Smith wrote:

Get a GPS. Some of them have built-in CDI right on the front panel
display. I don't find them very convenient, but they are legal.

I thought you had to have a separate CDI to use one as a primary navigation
tool for approaches. Is that incorrect?

My understanding (somebody please correct me if I'm wrong) is that some
of the newer units (I'm thinking specifically of the CNX-80) are
certified such that you don't need an external CDI, as long as the unit
is mounted so that the built-in one is within some specified distance
from the pilot's center of vision, or some such.