Great post, David. I have always been a firm believer in portable devices, for both the huge price advantage and the up-to-date features compared to certified panel-mount avionics. And your open-source approach rocks.
Went to the website you listed. They seem to be calling the system (Helm x650 with TrueMap) the Flight Cheetah FL 650. I note it can be portable or panel mounted, so one question: can you arrange it so it pulls out of the panel, thereby considering it portable, so an FAA inspector doesn't give you grief for installing a non-certified unit?
Ernie
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