Heading Bug Calibration Off

Heading Bug Calibration Off

I recently purchased a used 2000 172SP with an HSI.  When using the auto pilot I've noticed that the Heading Bug is 12 degrees off (when I set 312 degrees, the auto pilot heads to 300 degrees).  My local Cessna avionics shop has tried several attemps to align system with a laptop computer with no success.  Any suggestions or recommendations?

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Re: Heading Bug Calibration Off

What type autopilot? HSI?

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