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#1
July 14th 15, 12:36 AM
posted to rec.aviation.piloting
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Compass Questions ?
Hello,
Not a Pilot, but always interested in the engineering aspects. This question came up, and I realize that I am not sure of a correct answer. Regarding the compass heading that shows in the glass displays: How is it derived ? GPS ? If not GPS, what ? Is it then Magnetic or True ? Does the Pilot have to correct for variation/declination changes during a flight ? Does aviation use True or Magnetic when discussing or flying ? etc. ? Thanks, Bob 
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