Quote:
Originally Posted by Blackdog_kt
Since the desired heading compass card is off, you will need to input a "wrong" desired heading, altered by the same amount of degrees that the system is inaccurate, to compensate for the error and keep the plane from drifting. As an example, let's say you are flying due north and you want to engage the autopilot, it should look something like this:
---330---N---30--- (actual heading)
-----330---N---30--- (desired heading with corrective offset incorporated)
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isn't it something like ~10deg x cos(alpha), with alpha being the angular offset from an east-west orientation (for example west being 0 and east being pi, have I got it the right way?)(*). The "about 10deg" are taken from a post by luthier, regarding compass offset.
Just playing around with my very shaky rememberances on considerations regarding the magnetic poles from school...
(*) alternatively, probably better/more intuitive: 10deg x sin(beta), beta being angular offset from a north-south orientation...