What is the map projection for FAA terminal procedure charts and what are the parameters (standard parallels) for each specific airport? I couldn’t find any information with the publication information and also not on the charts.

  • $\begingroup$ Most terminal procedure charts are not even to scale: "Generally, DP charts are depicted “not to scale” due to the great distances involved on some procedures or route segments." (Aeronautical Chart User’s Guide - Terminal Procedure Publications). In those cases, the map projection does not matter since the charts are more of a sketch anyway. I don't know what they use when the charts are to scale though. $\endgroup$
    – Bianfable
    Dec 1, 2019 at 9:23
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    $\begingroup$ @Bianfable You should post that as an answer. $\endgroup$
    – TomMcW
    Dec 1, 2019 at 17:48
  • $\begingroup$ @TomMcW Well, it doesn't really answer the question. Some charts are to scale and that means they must have a map projection. The document I found does not say which one they use... $\endgroup$
    – Bianfable
    Dec 1, 2019 at 17:52
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    $\begingroup$ Thank you @Bianfable, while this applies to most STARs and SIDs I guess, the IAPs should be to scale (and a projection?), as they are georeferenced when used in e.g. ForeFlight. $\endgroup$
    – TobiBS
    Dec 1, 2019 at 17:54
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    $\begingroup$ If it’s capable of doing that And the points line up properly then there are two possibilities: either the charts use the same projection as the moving map uses or at that scale there isn’t a significant difference. I would expect the latter. $\endgroup$
    – TomMcW
    Dec 1, 2019 at 18:03


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