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Thread: A320...GPS Altitude Vs Altimeter Altitude
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Old 19th October 2007 | 13:52
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bookworm
 
Joined: Aug 2000
Posts: 3,648
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From: UK
Kuwait is always Higher than ISA Temp in the summer but not in the winter
As a rule of thumb, indicated altitude is 3.5% less than true altitude for every 10 degrees above ISA. Does that explain most of the discrepancy you observed?
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