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Kenneth Miess posted new forum topic
21d

Recently while flying a VFR aircraft with an EFIS, I updated the altimeter setting and received a message from the system warning that the altimeter reading was 900+ feet different from the GPS derived altitude (OMG!). I commented about it afterward and was told, “oh the altimeter must need to be calibrated”.

The discrepancy has led me to ask several questions:

  1. How accurate is the GPS derived altitude? Is it preferred? (When I land in my steam gauge plane, ForeFlight with ...