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Service to maintain database of airports, runways, helipads, navaid and fixes

At the bottom of the d-TPP webpage are downloadable ZIP files. File "E" has a XML file that catalogs changes to the plates in the current update cycle. https://www.faa.gov/air_traffic/...
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Service to maintain database of airports, runways, helipads, navaid and fixes

Most of this information is on an update cycle. Whether changes are made or not, old information expires. You don’t need a special app to look for changes, just ensure your data is current per the ...
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Why does ADS-B altitude from multiple landed planes vary so much from one plane to another?

The aircraft do not send out altitude when they are on the ground. On the ground, aircraft send out the surface messages, which combine position, speed and heading. The airborne message formats ...
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Is it appropriate to determine approximate flight altitudes based on ADS-B landed altitude compared to runway elevation?

For an after-the-fact analysis, for example looking at flight data recorded by an EFB or displayed on a flight-tracking website, what you describe sounds very reasonable. For use during a flight this ...
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