GPS Systems
Don't forget the interface needed as mentioned above.
One other comment on the Apollo GX60 (no one has mentioned it but me.) It has a wonderful COM unit built-in like the Garmin 300 BUT buried deep in the pages of the STC is the fact that the COM is not IFR approved for primary IFR communication. I have a KX155 for my 2nd COM and when it is out of the airplane, I can't legally fly IFR using the GX60. I've never pursued the reason why with the UPS/Apollo folks but it's there. I have no idea if any other GPS/COM units have the same restriction on primary IFR COM use. I didn't know this until 3 years into using the unit but I would probably have bought it anyway.
Definitely something to check into.
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