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Thread: Basic Aeronautical Knowledge: Altimetry and margins of error
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Old 19th Apr 2022, 10:44
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Clinton McKenzie
 
Join Date: Mar 2000
Location: Canberra ACT Australia
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Thanks swh.

What determines whether an ADS B data packet transmitted by an aircraft ‘chooses’ the encoded pressure altitude rather than the GNS height above the WGS-84 geoid? And if the encoded pressure altitude is transmitted in the ADS B data packet, what ‘chooses’ and how is the 25’ versus 100’ resolution ‘chosen’?
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