So here's a question- I've seen a couple of crashes caused by pitot tubes and failures. Why do modern airlines not have GPS as a backup? The $150 GPS I have for camping can give ground speed (I know air speed is more important; but it's better than nothing), direction, altitude, distance to landmarks, etc. You would think for a few thousand there could be a system installed as a backup that works completely differently than the pitot tubes.
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