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We get our GPS data from a real-world airline, so we have a big database of a) what runways that airline thinks exist, and b) where those runways are (lat/lon). If that information doesn't match exactly in X-Plane, the GPS will not show any approach procedures. The next beta will have additional features to report this issue.
I'm trying to fly instrument approaches in the Cessna 172 that is included with the install. There are no instrument procedures at all in the 430 or 530. I tried loading approaches for Aurora, OR (KUAO), Portland, OR (KPDX), and Chicago (KORD.) The airlines surely recognize PDX and ORD as a place where runways and procedures exist.
This site is no longer being actively maintained.