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Old 18th Dec 2010, 10:21
  #10 (permalink)  
wiggy
 
Join Date: Feb 2001
Location: The Winchester
Posts: 6,561
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Admiral

FWIW the later Boeings have a similar selection for STD vs. QNH. It might well be that Pheasant Plucker is seeing the "old" QNH on his gizmo.

In 20+ years of flying the tracks I've never heard of an unofficial vertical offset procedure.
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