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Leon,
If your pointing accuracy is off it's unlikely to be the fault of PEC. PEC would make a small effect but it would only be small. It's much more likely that no matter how accurate you think the polar alignment is, it's not perfect and that is leading to pointing error. Other possibilities are movement & flexing of the mount due to balance/weight.
By all means train the PEC, it will improve overall performance, but it probably won't have a large impact on the Go To accuracy.
Training the PEC does not affect your polar alignment, you don't make changes to the actual mount's mechanical position relative to the tripod during PEC, only electronic changes via the hand controller to keep the star centred.
I don't understand why Gama says not to use a star - I would suggest using a medium brightness star for PEC training. Providing it's not variable or something else strange like that.
Roger.
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