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GPS signal is equally guaranteed to be lost at some time. Worse, guaranteed to be lost more often that the mechanical guages fail. I'd rather not be depending on an AI that needs a GPS lock.

I was going to buy one until I found about about it needing a GPS lock for attitude. Makes it worthless as an emergency attitude indicator. I haven't flown behind a GPS yet that hasn't lost signal at some point in time. The last thing you want is an attitude indicator that needs a GPS signal.