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Old July 14th 15, 11:47 AM posted to rec.aviation.piloting
Bob
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Posts: 10
Default Compass Questions ?

Hi,

Thanks for replies and help.

What I was referring to are the new, modern, "glass" displays where most
everything shown is derived
from transducers located elsewhere.

e.g. when a display shows a Heading of, e.g., 075, it is of course
getting this info. from some kind of transducer, located elsewhere.

Is it derived directly from GPS ?
A Hall effect compass ?
or,... ?

Thanks again; interesting subject.

Bob
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On 7/13/2015 6:36 PM, Bob wrote:
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