OnStep always has a star model when you boot up. It knows your GPS location, UTC Offset and Date time. It knows how many steps per degree it takes to move the mount.
When you do a star alignment you are then changing the model by telling it how far off you are from each target object.
Thus you will get your error of polar alignment as you add alignment stars telling onstep how far off each star is from its default model.
Chad
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