You are kind of late to this party.
- You are correct in your first sentence regarding what pressing the heading select button does, and I always understood that the bug should centre on the current heading. The problem was that the sim was gradually adding gyro drift even if that feature was turned off in the assistance settings. The fact is that the G1000 does not even have a gyro:
Source: Max Trescott’s G1000 and Perspective Glass Cockpit Handbook, Fifth Edition, chapter 3, page 14. "The AHRS is a solid-state replacement for mechanical gyros."
The modern solid state devices do not suffer gyroscopic precession, so the sim adding gyro drift was completely wrong in the first place.
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Several of us understood the nature of the problem quite clearly and it was reported to Zendesk.
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Your comment about programming a button is actually a SimConnect issue and not the subject being discussed here.
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The gyro drift issue seemed to have been fixed long ago. I am actually surprised that this topic has not been automatically closed.
PS. I have done a wee bit of real flying too, as have quite a few others here using this sim since it first launched in August 2020 