FS9 and responses to Mag Variations

Does anyone know if FS responds to mag compass variations such as real-world aircraft have?
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I regularly press my "D" (Direction) Bearing button for "Compass" correction, and "B" buttons for "Altitude" correction before, and during my flight.
Some of my selected Aircraft require this to obtain correct readings!
Paul...making sure I am going in the right direction, at the correct altitude......!