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#22
September 26th 08, 10:14 PM
posted to rec.aviation.soaring
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need for dial altimeter?
Peter Purdie wrote:
Transponders give Flight Level (assuming they are working properly), so will give the altitude ATC are intereted in. That's how they know what FL you are at when not talking to them. There are places in the world where airspace structure is pretty complex and where you must know your QNH altitude to stay clear of airspaces, regardless of ATC. 
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