Gday Brendan
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But still if your PE is that bad that you need an PE program to give the guider a chance, take it back
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Ahh but PE is like religion
There are no Specs to define whats good

50arcsec pk-pk with a pure sinusoidal error is easier to work with than say a high freq sawtooth at only 10sec pk-pk
Its all relative
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don't miss understand me i just love debating and will push my point till somebody can prove to me without a doubt that their way is better for me than my way
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Understood, and its always an interesting debate, as it depends on many things, including your actual equipment, which can be quite variable.
Ie there is no "correct way" that suits all.
The question was asked re a Meade LX200GPS scope.
For these Meades, there is no overhead in PEC playback
( ie guide commands dont fight PEC for the right to play with the motors )
As such a good PEC model will help, as any good proactive corrections will be better than reactive ones.
Andrew